Heat exchanger

Abstract

The application relates to the technical field of refrigeration equipment, in particular to a heat exchange device, which comprises a heat exchange core body, the heat exchange core body comprises a plurality of hollow plates arranged in sequence and at intervals along a first direction, the hollow plate has oppositely arranged first and second sides, a liquid film channel is formed between the first and second sides, the liquid film channel has a liquid inlet for injecting cooling liquid into the liquid film channel; in any two adjacent hollow plates, the first sides of the two hollow plates are opposite to each other so that a cold air channel is formed between the two first sides, or the second sides of the two hollow plates are opposite to each other so that a hot air channel is formed between the two second sides, and the gas in the liquid film channel can penetrate through the first side into the cold air channel.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and more particularly to heat exchange devices. Background Technology

[0002] The heat exchanger core of the heat exchanger has a dry channel and a wet channel. The air in the dry channel and the wet channel does not come into contact; instead, heat is transferred through the heat exchange surface. During the heat exchange process, circulating water sprays onto the unsaturated air (called secondary air) passing through the wet channel, forming a water film on the heat exchange wall of the wet channel. The evaporation of water absorbs the heat from the water film itself and the heat from the air being cooled in the dry channel (called primary air). In this way, both the water film and the heat exchange surface are maintained at a low temperature to cool the primary air, i.e., the supply air. For the heat exchanger, the higher the water film coverage on the heat exchange wall of the wet channel, the higher the heat exchange efficiency of the heat exchanger core.

[0003] In the process of developing this application, the inventors discovered that the prior art has at least the following problems: Existing spraying methods suffer from numerous challenges: high flow resistance, uneven water distribution, and poor wetting ability, often failing to form a 100% water film coverage. If high-pressure spraying is used, numerous studies have shown that while the spray volume is large, much of the water is not evaporated but blown away, significantly increasing the unit's water usage efficiency (WUE) and leading to greater water waste. Summary of the Invention

[0004] This application proposes a heat exchange core and a heat exchange device, aiming to comprehensively improve the heat exchange efficiency of the heat exchange core and the water utilization rate.

[0005] In a first aspect, embodiments of this application provide a heat exchange device, including a heat exchange core, the heat exchange core including a plurality of hollow plates arranged at intervals along a first direction, the hollow plates having a first side and a second side arranged opposite to each other, a liquid film channel being formed between the first side and the second side, the liquid film channel having a liquid inlet for injecting coolant into the liquid film channel; In any two adjacent hollow plates, the first sides of the two hollow plates face each other to form a cold air channel between the two first sides, or the second sides of the two hollow plates face each other to form a hot air channel between the two second sides, and the gas in the liquid film channel can pass through the first side into the cold air channel.

[0006] In some embodiments, the hollow board is a hollow fiberboard, with a one-way vent hole on the first side and a heat-conducting plate that prevents liquid penetration on the second side.

[0007] In some embodiments, the heat exchange core further includes a support member, and the hollow plate is disposed on the support member; The support is a heat-conducting mesh, which is located on the second side of the hollow plate.

[0008] In some embodiments, the cold air passage and / or the hot air passage are provided with a turbulence-disrupting component.

[0009] In some embodiments, the width of the liquid film channel along the first direction is 50 μm to 200 μm; and / or, The thickness of the first side of the hollow plate is 50 μm to 100 μm; and / or, The porosity of the first side of the hollow plate is 85%~95%.

[0010] In some embodiments, the liquid film channel also has a liquid outlet, and the heat exchange device further includes a first liquid collector and a second liquid collector connected in series. The first liquid collector is connected to the liquid film channel through the liquid inlet, and the second liquid collector is connected to the liquid film channel through the liquid outlet. The first liquid collector, the liquid film channel and the second liquid collector are connected in sequence to form a circulation channel for the coolant.

[0011] In some embodiments, the inlet is located at the lower end of the liquid film channel, the outlet is located at the upper end of the liquid film channel, the first collector has a plurality of injection ports arranged sequentially at intervals along the first direction, the injection ports are connected to the inlet, and the second collector has a plurality of return ports arranged sequentially at intervals along the first direction, the return ports are connected to the inlet one by one. In some embodiments, the first liquid collector has a first clearance groove on the side facing the liquid film channel, the injection port is located on the wall of the first clearance groove, and the side of the liquid film channel with the outlet is embedded in the first clearance groove, with the first clearance groove and the outlet corresponding one-to-one; and / or, The second liquid collector has a second clearance groove on the side facing the liquid film channel. The return port is located on the wall of the second clearance groove. The side of the liquid film channel with the liquid inlet is embedded in the second clearance groove. The second clearance groove and the liquid inlet are arranged in a one-to-one correspondence.

[0012] In some embodiments, the liquid inlet is located at the upper end of the liquid film channel, the liquid outlet is located at the bottom of the lower end of the liquid film channel, and the second liquid collector is located below the heat exchange core. The second liquid collector is used to receive the coolant flowing down from the liquid film channel.

[0013] In some embodiments, the heat exchange device further includes a liquid pump located in the flow path between the first liquid collector and the second liquid collector, for driving the coolant to circulate between the first liquid collector, the liquid film channel and the second liquid collector.

[0014] Compared with the prior art, this technical solution has at least the following technical advantages: In this technical solution, the liquid film channel and the hot air channel are separated by the second side of the hollow plate, and the liquid film channel and the cold air channel are separated by the first side of the hollow plate. During the refrigeration process, the coolant forms a liquid film in the liquid film channel. The primary air (hot air or supply air) in the hot air channel transfers its heat to the surface of the liquid film through the second side of the hollow plate, causing the coolant to undergo a phase change on the surface of the liquid film and vaporize into vapor. This vapor passes through the first side of the hollow plate and enters the cold air channel, and is then carried away by the cold air flowing through the cold air channel. During the aforementioned refrigeration process, the cold air channel is at atmospheric pressure and has a windy environment, so its pressure is lower than the air pressure in the liquid film channel. This pressure difference pushes the vapor in the liquid film channel towards the cold air channel, thus accelerating the evaporation of the coolant in the liquid film channel and improving the heat exchange efficiency of the heat exchange device. In addition, since a separate liquid film channel for coolant circulation is opened in the hollow plate, the coolant can fill the liquid film channel during the refrigeration process. This improves the uniformity of liquid distribution in the heat exchange core and ensures that the coolant forms a 100% liquid film covering the inner wall surface on the second side of the hollow plate, which further improves the heat exchange efficiency of the heat exchange device. Furthermore, separating the liquid film channel for coolant circulation also prevents the coolant from being blown away by the cold air in the wet channel, thus improving the utilization rate of the coolant. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the heat exchange device of this application in one embodiment; Figure 2 for Figure 1 A cross-sectional view of the hollow plate in the middle; Figure 3 for Figure 1 A partial structural diagram; Figure 4 for Figure 1 A schematic diagram of the assembly of the hollow plate and supporting components; Figure 5 This is a schematic diagram of the heat exchange device of this application in another embodiment; Figure 6 This is a schematic diagram of the heat exchange device of this application in yet another embodiment; Figure 7 This is a schematic diagram of the heat exchange device of this application in another embodiment; Figure 8 for Figure 7 Enlarged view of part A in the image.

[0017] Figure label: Detailed Implementation To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0020] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0021] This application provides a heat exchange device 100.

[0022] For ease of description, the width direction of the heat exchanger 100 is defined as the X-axis direction, the length direction of the heat exchanger 100 is defined as the Y-axis direction, and the height direction of the heat exchanger 100 is defined as the Z-axis direction. The X-axis, Y-axis, and Z-axis directions are all perpendicular to each other.

[0023] The directional terms such as "upper," "lower," "top," "bottom," "left," "right," "front," and "rear" used in the description of the heat exchange device 100 in this application are mainly based on the heat exchange device 100 attached to the appendix. Figure 1 The orientation of the display is described in terms of the positive direction of the Z-axis as "top" or "up", the negative direction of the Z-axis as "bottom" or "down", the positive direction of the X-axis as "right", the negative direction of the X-axis as "left", the positive direction of the Y-axis as "back", and the negative direction of the Y-axis as "front". This does not constitute a limitation on the orientation of the heat exchange device 100 in the actual application scenario.

[0024] Please see Figures 1-8In this embodiment, the heat exchange device 100 includes a heat exchange core 110, which includes a plurality of hollow plates 111 arranged at intervals along a first direction (X-axis direction). Each hollow plate 111 has a first side 1111 and a second side 1112 arranged opposite to each other. A liquid film channel 111a is formed between the first side 1111 and the second side 1112 of the hollow plate 111. The liquid film channel 111a has a liquid inlet 111a1 for supplying cooling. The liquid is injected into the liquid film channel 111a; in any two adjacent hollow plates 111, the first sides 1111 of the two hollow plates 111 face each other so that a cold air channel 113 is formed between the two first sides 1111, or the second sides 1112 of the two hollow plates 111 face each other so that a hot air channel 112 is formed between the two second sides 1112, and the gas in the liquid film channel 111a can pass through the first side 1111 of the hollow plate 111 and enter the cold air channel 113.

[0025] It should be noted that in the embodiments of this application, among two adjacent hollow panels 111, either the first side 1111 of the two hollow panels 111 is opposite to the first side 1111, or the second side 1112 of the two hollow panels 111 is opposite to the second side 1112, and the above two relative arrangements are alternated. For example, when there are 4 hollow panels 111, if the first hollow panel 111 is opposite to the first side 1111 of the second hollow panel 111, then the second side 1112 of the second hollow panel 111 is opposite to the second side 1112 of the third hollow panel 111, and the first side 1111 of the third hollow panel 111 is opposite to the first side 1111 of the fourth hollow panel 111.

[0026] In the technical solution of this application, the liquid film channel 111a is separated from the hot air channel 112 by the second side 1112 of the hollow plate 111, and the liquid film channel 111a is separated from the cold air channel 113 by the first side 1111 of the hollow plate 111. During the refrigeration process, the coolant forms a liquid film in the liquid film channel 111a. The primary air (hot air or supply air) in the hot air channel 112 transfers its heat to the surface of the liquid film through the second side 1112 of the hollow plate 111, causing the coolant to undergo a phase change on the surface of the liquid film and vaporize into vapor. The vapor passes through the first side 1111 of the hollow plate 111 and enters the cold air channel 113, and is then carried away by the cold air flowing through the cold air channel 113. During the aforementioned refrigeration process, since the cold air channel 113 is at normal pressure and has a windy environment, its pressure is lower than the air pressure in the liquid film channel 111a. This pressure difference will push the vapor in the liquid film channel 111a to move into the cold air channel 113, which will accelerate the evaporation of the coolant in the liquid film channel 111a, thereby improving the heat exchange efficiency of the heat exchange device 100. In addition, since a separate liquid film channel 111a for coolant circulation is opened in the hollow plate 111, the coolant can fill the liquid film channel 111a during the refrigeration process. This can improve the uniformity of liquid distribution in the heat exchange core 110 and ensure that the coolant forms a 100% liquid film covering the inner wall surface of the second side 1112 of the hollow plate 111, which can further improve the heat exchange efficiency of the heat exchange device 100. Furthermore, by separating the liquid film channel 111a for coolant circulation, the coolant can be prevented from being blown away by the cold air in the wet channel, thereby improving the utilization rate of the coolant.

[0027] In this embodiment, both the hot air channel 112 and the cold air channel 113 extend from their inlets to their outlets. Both have inlets / outlets perpendicular to a first direction. The axial directions of the inlets / outlets of the hot air channel 112 and the cold air channel 113 can be parallel or perpendicular; that is, the extending directions of the hot air channel 112 and the cold air channel 113 can be parallel or perpendicular. Those skilled in the art can design according to actual application scenarios. In one specific embodiment, the extending directions of the hot air channel 112 and the cold air channel 113 are perpendicular. The axial direction of the inlet / outlet of the hot air channel 112 is a second direction (Y-axis direction), and the axial direction of the inlet / outlet of the cold air channel 113 is a third direction (Z-axis direction).

[0028] Please see Figure 1 and Figure 5In this embodiment of the application, the number of hot air channels 112 and cold air channels 113 can be one or more independently. In one specific embodiment, the number of hot air channels 112 is multiple, and the multiple hot air channels 112 are arranged adjacent to each other in a third direction. The number of cold air channels 113 and liquid film channels 111a is one, and one cold air channel 113 / liquid film channel 111a corresponds to multiple hot air channels 112.

[0029] In this embodiment, the first side 1111 of the hollow plate 111 is configured to allow unidirectional passage of coolant vapor in the liquid film channel 111a, and the second side 1112 of the hollow plate 111 is preferably configured as a baffle structure that prevents coolant vapor in the liquid film channel 111a from passing through, so as to prevent the coolant from being blown away by the gas in the hot air channel 112, thereby eliminating the possibility of "fluid drift". It can be understood that in some special application scenarios (where the gas in the hot air channel 112 needs to be humidified), or based on the overall material properties of the hollow plate, the second side 1112 of the hollow plate 111 can also be a baffle structure that allows a very small amount (far less than the second side) of coolant vapor in the liquid film channel 111a to pass through. In this case, since the amount of coolant vapor passing through the first side 1111 in the liquid film channel 111a is much higher than the amount of coolant vapor passing through the second side 1112, the heat exchange efficiency of the heat exchange device 100 is basically unaffected, and the amount of "fluid drift" is extremely small.

[0030] Please see Figure 2 In one embodiment, a one-way vent hole 1111a is provided on the first side 1111, and the second side 1112 is a heat-conducting plate that prevents liquid penetration. Coolant vapor in the liquid film channel 111a passes through the one-way vent hole 1111a into the cold air channel 113, but cannot pass through the heat-conducting plate into the hot air channel 112.

[0031] Based on the above embodiments, in one specific embodiment, the diameter of the one-way vent 1111a is 0.1 μm. By keeping the one-way vent 1111a within a suitable diameter range, it can be ensured that the coolant in the liquid film channel 111a cannot pass through the first side 1111, but the vapor of the coolant can pass through the first side 1111 and enter the cold air channel 113.

[0032] In one embodiment, the porosity of the first side 1111 is 85% to 95%, specifically 85%, 88%, 91%, 95%, or any value between them. Within this porosity range, it is advantageous to control the evaporation rate of the coolant within a suitable range.

[0033] In one embodiment, the hollow board 111 is made of fiber, that is, the hollow board 111 is a hollow fiberboard 111. Of course, those skilled in the art can also choose other suitable materials to make the hollow board in the embodiments of this application.

[0034] In one embodiment, the thickness of the first side 1111 is 50 μm to 100 μm, specifically 50 μm, 60 μm, 70 μm, 8 μm, 9 μm, 100 μm or any value between them. Within the above thickness range, it is beneficial to increase the transmembrane (first side 1111) rate of coolant vapor while taking into account the strength of the unidirectional permeation membrane 1111.

[0035] In one embodiment, the thickness of the second side 1112 is 90 μm to 110 μm, specifically 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, or any value between them. Within this thickness range, it is beneficial to balance the strength of the heat exchange core 110 with the heat transfer efficiency between the liquid film channel 111a and the hot air channel 112.

[0036] In one embodiment, the width of the liquid film channel 111a along the first direction is 50 μm to 200 μm, specifically 50 μm, 80 μm, 110 μm, 140 μm, 170 μm, 200 μm, or any value between them. Within the above width range, it facilitates the filling of coolant into the liquid film channel 111a, helps reduce the flow resistance of the coolant in the liquid film channel 111a, and helps increase the evaporation rate of the coolant.

[0037] In this embodiment, the coolant can be water or other refrigerants. For cost reasons, water is generally chosen as the coolant.

[0038] In this embodiment, a turbulence-inducing component can be provided in the cold air channel 113 to enhance the heat exchange efficiency between the cold air channel 113 and the liquid film channel 111a; and a turbulence-inducing component can be provided in the hot air channel 112 to increase the heat exchange efficiency between the hot air channel 112 and the liquid film channel 111a.

[0039] Please see Figure 4 In this embodiment of the application, the heat exchange core 110 further includes a support member 115, and a hollow plate 111 is disposed on the support member 115. By disposing the hollow plate 111 on the support member 115, the overall strength of the heat exchange core 110 can be increased.

[0040] In one embodiment, the support member 115 is a heat-conducting mesh, which is disposed on the second side 1112 of the hollow plate 111. The heat-conducting mesh can increase the overall strength of the heat exchange core 110 on the one hand, and enhance the heat exchange between the liquid film channel 111a and the hot air channel 112 on the other hand.

[0041] In the above embodiment, a heat-conducting mesh is provided on each of the second sides 1112 of the adjacent hollow plates 111 facing each other. That is, two heat-conducting meshes are provided in the hot air channel 112 between the two adjacent hollow plates 111. In this case, the turbulence component in the hot air channel 112 can be a heat-conducting strip. The heat-conducting strip is made of the same material as the heat-conducting mesh, and the two ends of the heat-conducting strip are respectively connected to the mesh strips of the two heat-conducting meshes in the hot air channel 112.

[0042] In some embodiments, the liquid film channel 111a further has an outlet 111a2 for coolant to flow out of the liquid film channel 111a. The outlet 111a2 and the inlet 111a1 can be connected to form a circulation channel to accelerate the flow rate of coolant in the liquid film channel 111a, thereby further improving the heat exchange capacity of the heat exchange device 100.

[0043] It is understood that in some embodiments, the outlet 111a2 can be omitted, and the coolant is injected into the liquid film channel 111a through the inlet 111a1. Part of the coolant absorbs heat and evaporates into a gaseous state, crosses the one-way permeation membrane 1111, enters the cold air channel 113, and is dispersed to the outside.

[0044] In some embodiments, the heat exchange device 100 further includes a circulation system, which is connected to the liquid film channel 111a via an inlet 111a1 and an outlet 111a2 to form a circulation channel for the coolant. During the refrigeration process, the circulation system injects coolant into the inlet 111a1 of the liquid film channel 111a. Part of the coolant absorbs heat and evaporates into a gaseous state, crossing the one-way permeation membrane 1111 and entering the cold air channel 113. The other part flows out from the outlet 111a2 of the liquid film channel 111a and re-enters the circulation system.

[0045] In the above embodiments, the inlet 111a1 and the outlet 111a2 can be independently located at the top, bottom or side of the liquid film channel 111a, as long as the liquid film channel 111a can be continuously filled with coolant.

[0046] In the above embodiments, there are various specific structures and installation methods for the circulation system.

[0047] In some embodiments, the circulation system includes a first liquid collector 120 and a second liquid collector 130 connected to each other. The first liquid collector 120 is connected to a liquid film channel 111a through an inlet 111a1, and the second liquid collector 130 is connected to the liquid film channel 111a through an outlet 111a2. The first liquid collector 120, the liquid film channel 111a, and the second liquid collector 130 are sequentially connected to form a circulation channel for the coolant. During the refrigeration process, the circulation path of the coolant is: first liquid collector 120 → liquid film channel 111a → second liquid collector 130 → first liquid collector 120. Please see Figure 1 and Figure 3 In one embodiment, the coolant enters from the bottom and exits from the top in the liquid film channel 111a. The inlet 111a1 is located at the lower end of the liquid film channel 111a, and the outlet 111a2 is located at the upper end of the liquid film channel 111a. The first collector 120 and the second collector 130 are both tubular structures extending along a first direction. The first collector 120 is provided with a plurality of injection ports arranged sequentially and spaced along the first direction. The injection ports are connected to the inlet 111a1 one by one. The second collector 130 is provided with a plurality of return ports arranged sequentially and spaced along the first direction. The return ports are connected to the inlet 111a1 one by one.

[0048] In the above embodiment, the first liquid collector 120 is further provided with a plurality of first clearance grooves 120a arranged sequentially along a first direction. The liquid injection port is located on the groove wall of the first clearance groove 120a. The side of the liquid film channel 111a with the liquid inlet 111a1 extends into the first clearance groove 120a and connects with the liquid injection port. The first clearance grooves 120a and the liquid film channels 111a are arranged in a one-to-one correspondence. By providing the first clearance grooves 120a on the first liquid collecting pipe, the assembly stability of the first liquid collecting pipe and the heat exchange core 110 can be improved, and the overall compactness of the heat exchange device 100 can be enhanced.

[0049] Similarly, the second liquid collector 130 is provided with a plurality of second clearance grooves 130a arranged sequentially along the first direction. The return liquid port is located on the groove wall of the second clearance groove 130a. The side of the liquid film channel 111a with the liquid outlet 111a2 extends into the second clearance groove 130a and connects with the return liquid port. The second clearance groove 130a and the liquid film channel 111a are arranged in a one-to-one correspondence.

[0050] In the above embodiments, the liquid inlet 111a1 is disposed on the front / rear sidewall of the lower end of the liquid film channel 111a, or at the bottom of the liquid film channel 111a, and the liquid outlet 111a2 is disposed on the front / rear sidewall of the upper end of the liquid film channel 111a, or at the top of the liquid film channel 111a. In a specific embodiment, the bottom of the liquid film channel 111a extends from the heat exchange core 110, the liquid inlet 111a1 is disposed at the bottom or front / rear side of the extended portion, and the extended portion is embedded in the first clearance groove 120a; the top of the liquid film channel 111a extends from the heat exchange core 110, the liquid outlet 111a2 is disposed at the top or front / rear side of the extended portion, and the extended portion is embedded in the second clearance groove 130a.

[0051] Please see Figure 6 and Figure 7In another embodiment, the coolant enters from the top and exits from the bottom in the liquid film channel 111a. The inlet 111a1 is located at the upper end of the liquid film channel 111a, and the outlet 111a2 is located at the bottom of the lower end of the liquid film channel 111a. The second collector 130 is located below the heat exchange core 110 and is used to receive the coolant flowing down from the liquid film channel 111a.

[0052] In the above embodiments, the liquid film channel 111a may be provided with one or more outlets 111a2. In order to reduce the fluctuation of the coolant at the outlets 111a2 of the liquid film channel 111a and thus improve the uniformity of coolant distribution, preferably, the bottom of the liquid film channel 111a is provided with a plurality of outlets 111a2 arranged sequentially and spaced apart along the second direction, and the top of the second liquid collector 130 is provided with a plurality of rows of return ports arranged along the first direction. Each row of return ports is located below a liquid film channel 111a, and the return port of each row of return ports is connected to the outlets 111a2 at the bottom of the liquid film channel 111a above it.

[0053] In the above embodiments, the first liquid collector 120 can arbitrarily select methods such as small hole injection, small hole drop, gap drop, or a combination of small hole drop and gap drop to inject coolant into the liquid film channel 111a.

[0054] Based on the above embodiments, please refer to Figure 7 In one embodiment, the first liquid collector 120 is a liquid distribution network tube, which includes multiple liquid distribution tubes and manifolds 122 located at both ends of these liquid distribution tubes; wherein, the manifolds 122 are connected to the second liquid collector 130 through connecting pipes, the multiple liquid distribution tubes are arranged sequentially and spaced apart between the two manifolds 122 along the first direction, the manifolds 122 connect the multiple liquid distribution tubes, the liquid distribution tubes are arranged one-to-one with the liquid film channel 111a, and each liquid distribution tube has a liquid distribution hole (i.e., liquid injection port) at its bottom.

[0055] In one specific embodiment, the top of the liquid film channel 111a is provided with an opening as a liquid inlet 111a1, and a liquid distribution pipe is correspondingly provided above the liquid film channel 111a. The number of liquid distribution holes can be one or more, with one liquid inlet 111a1 corresponding to one or more liquid distribution holes. In order to reduce the fluctuation of coolant at the liquid inlet 111a1 of the liquid film channel 111a and thus improve the uniformity of coolant distribution, preferably, the top of the liquid film channel 111a is open, and the number of liquid distribution holes is multiple, which are arranged sequentially and at intervals along the second direction. During the refrigeration process, the circulation path of the coolant is: manifold 122 → liquid distribution pipe → liquid film channel 111a → second liquid collector 130 → manifold 122.

[0056] Please see Figure 7 and Figure 8In order to further reduce the fluctuation of coolant at the inlet 111a1 of the liquid film channel 111a, in another specific embodiment, the hot air channel 112 extends along the second direction, and an overflow groove 114 is provided at the top of the hot air channel 112. The top of the overflow groove 114 is open, and the overflow groove 114 is separated from the liquid film channel 111a by the second side 1112 of the liquid film channel 111a. The liquid distribution network is provided above the heat exchange core 110 to inject coolant into the overflow groove 114. The overflow groove 114 has an overflow port 114a on the side facing the one-way permeation membrane 1111 (the second side 1112 of the liquid film channel 111a) so that the coolant injected by the liquid distribution network overflows into the liquid film channel 111a. In the second direction, the length of the overflow port 114a is equal to or slightly less than the length of the hot air channel 112 / liquid film channel 111a. During the cooling process, coolant drips from the distribution holes of the distribution pipe into the overflow tank 114. When the water level in the overflow tank 114 reaches the height of the overflow port 114a, the coolant continuously overflows into the liquid film channel 111a. During this process, the coolant flows slowly and evenly down the heat-conducting wall between the liquid film channel 111a and the hot air channel 112, which can further improve the uniformity of coolant distribution. The overall circulation path of the coolant is: manifold 122 → distribution pipe → overflow tank 114 → liquid film channel 111a → second collector 130 → manifold 122.

[0057] In the above specific embodiment, the overflow port 114a is formed by the top of the second side 1112 of the liquid film channel 111a. The upper extension height of the liquid film channel 111a is consistent with the upper extension height of the overflow groove 114. If the overflow port 114a is sealed, the highest liquid level height that the coolant can reach in the liquid film channel 111a and the hot air channel 112 is consistent.

[0058] In the above specific embodiment, the diameter of the distribution pipe is smaller than the width of the overflow tank 114 along the first direction, which ensures that all the coolant dripping from the distribution hole falls into the overflow tank 114. Preferably, the diameter of the distribution pipe is 1 mm to 2 mm smaller than the width of the overflow tank 114 along the first direction, specifically it can be 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm or any value between them. Within this range, the flow resistance of the coolant in the distribution pipe can be minimized as much as possible.

[0059] In the above specific embodiment, there is a certain height difference between the liquid distribution pipe and the overflow tank 114. Preferably, the height difference between the bottom of the liquid distribution pipe and the top of the overflow tank 114 is 3 cm to 5 cm, specifically 3 cm, 3.5 cm, 4 cm, 4.5 cm, 5 cm, or any value between them. Within this height difference range, it is beneficial to reduce the fluctuation of coolant in the overflow tank 114 without affecting the assembly between the liquid distribution network pipe and the heat exchange core 110.

[0060] In the above specific embodiments, the diameter of the liquid distribution hole can be adjusted according to the diameter of the liquid distribution pipe, the size of the overflow tank 114, etc. In one specific embodiment, the width of the overflow tank 114 / hot air channel 112 / cold air channel 113 along the second direction is 5 mm to 10 mm, for example, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm or any value between them, and the diameter of the liquid distribution hole is 2 mm to 4 mm, for example, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm or any value between them.

[0061] In the above specific embodiment, a guide plate is further provided in the overflow tank 114. The guide plate is formed by extending obliquely downward from the lower end wall of the overflow port 114a away from the one-way permeation membrane 1111. The guide plate has a smooth curved surface, which can reduce the surface tension of the heat-conducting plate 1112 between the coolant and the liquid film channel 111a and the dry channel, thereby further improving the uniformity of coolant distribution.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A heat exchange device, characterized in that, The device includes a heat exchange core, which includes a plurality of hollow plates arranged at intervals along a first direction. Each hollow plate has a first side and a second side arranged opposite to each other. A liquid film channel is formed between the first side and the second side. The liquid film channel has a liquid inlet for injecting coolant into the liquid film channel. In any two adjacent hollow plates, the first sides of the two hollow plates face each other to form a cold air channel between the two first sides, or the second sides of the two hollow plates face each other to form a hot air channel between the two second sides, and the gas in the liquid film channel can pass through the first side into the cold air channel.

2. The heat exchange device as described in claim 1, characterized in that, The hollow board is a hollow fiberboard; a one-way vent is provided on the first side, and the second side is a heat-conducting plate that prevents liquid penetration.

3. The heat exchange device as described in claim 1, characterized in that, The heat exchange core also includes a support member, and the hollow plate is disposed on the support member; The support is a heat-conducting mesh, which is located on the second side of the hollow plate.

4. The heat exchange device as described in claim 1, characterized in that, The cold air channel and / or the hot air channel are provided with a turbulence-inducing component.

5. The heat exchange device as described in claim 1, characterized in that, Along the first direction, the width of the liquid film channel is 50 μm to 200 μm; and / or, The thickness of the first side of the hollow plate is 50 μm to 100 μm; and / or, The porosity of the first side of the hollow plate is 85%~95%.

6. The heat exchange device according to any one of claims 1-5, characterized in that, The liquid film channel also has a liquid outlet, and the heat exchange device further includes a first liquid collector and a second liquid collector connected in series. The first liquid collector is connected to the liquid film channel through the liquid inlet, and the second liquid collector is connected to the liquid film channel through the liquid outlet. The first liquid collector, the liquid film channel and the second liquid collector are connected in sequence to form a circulation channel for the coolant.

7. The heat exchange device as described in claim 6, characterized in that, The inlet is located at the lower end of the liquid film channel, and the outlet is located at the upper end of the liquid film channel. The first liquid collector has a plurality of injection ports arranged at intervals along the first direction, and the injection ports are connected to the inlet. The second liquid collector has a plurality of return ports arranged at intervals along the first direction, and the return ports are connected to the inlet one by one.

8. The heat exchange device as described in claim 7, characterized in that, The first liquid collector has a first clearance groove on the side facing the liquid film channel. The injection port is located on the wall of the first clearance groove. The side of the liquid film channel with the liquid outlet is embedded in the first clearance groove. The first clearance groove and the liquid outlet are arranged in a one-to-one correspondence; and / or, The second liquid collector has a second clearance groove on the side facing the liquid film channel. The return port is located on the wall of the second clearance groove. The side of the liquid film channel with the liquid inlet is embedded in the second clearance groove. The second clearance groove and the liquid inlet are arranged in a one-to-one correspondence.

9. The heat exchange device as described in claim 6, characterized in that, The liquid inlet is located at the upper end of the liquid film channel, the liquid outlet is located at the bottom of the lower end of the liquid film channel, and the second liquid collector is located below the heat exchange core. The second liquid collector is used to receive the coolant flowing down from the liquid film channel.

10. The heat exchange device as described in claim 6, characterized in that, The heat exchange device further includes a liquid pump, which is located in the flow path between the first liquid collector and the second liquid collector, and is used to drive the coolant to circulate between the first liquid collector, the liquid film channel and the second liquid collector.

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