Micro-channel heat exchanger and hot water equipment

Abstract

The utility model belongs to the technical field of electric appliances, and particularly relates to a micro-channel heat exchanger and hot water equipment.The micro-channel heat exchanger comprises two collecting pipes arranged oppositely and a plurality of heat exchange pipes used for communicating the two collecting pipes, and a refrigerant inlet and a refrigerant outlet are formed in the two ends, in the extending direction, of each collecting pipe; at least one first liquid separation spacer is arranged in each collecting pipe, so that the collecting pipe is divided into at least two first cavities through the first liquid separation spacers, and the multiple first cavities are sequentially arranged in the extending direction of the collecting pipe; wherein at least one through hole is formed in the first liquid separation spacer, the through hole is communicated with the two adjacent first cavities, and the total area of the through holes in the first liquid separation spacer is sequentially increased from the refrigerant inlet to the refrigerant outlet, so that the state change of the refrigerant is matched, and a gaseous refrigerant and a liquid refrigerant are effectively separated through the through holes in the first liquid separation spacer; and the heat exchange performance is improved.

Description

Technical Field

[0001] The present application belongs to the field of electrical technology, and specifically relates to a microchannel heat exchanger and a hot water device. Background Art

[0002] Currently, most air-energy water heaters heat the water in the inner tank by wrapping a microchannel heat exchanger around the outer surface of the inner tank.

[0003] A microchannel heat exchanger generally includes two manifolds and multiple microchannel flat tubes. The two ends of the microchannel flat tubes are connected to two manifolds respectively, so that the refrigerant flows between the manifolds and the microchannel flat tubes to exchange heat with the water in the inner tank.

[0004] Currently, to extend the refrigerant flow and maximize heat exchange, partitions are typically installed within the manifold. These partitions divide the manifold into multiple first cavities, which are then connected by microchannel flat tubes. This allows the refrigerant to flow through all the first cavities and microchannel flat tubes in sequence, effectively extending the refrigerant flow and improving heat exchange performance. However, as the refrigerant passes through the microchannel heat exchanger, the degree of liquefaction of the refrigerant varies in different flows. Using partitions to separate the manifold into multiple first cavities can easily result in incomplete refrigerant separation or loss of gaseous refrigerant, affecting heat exchange performance. Utility Model Content

[0005] The present application provides a microchannel heat exchanger and a hot water device to improve the effect of refrigerant gas-liquid separation.

[0006] A first aspect of the present application provides a microchannel heat exchanger, comprising two manifolds arranged opposite to each other and a plurality of heat exchange tubes for connecting the two manifolds, wherein a refrigerant inlet and a refrigerant outlet are provided on one of the two manifolds, or the refrigerant inlet is provided on one of the two manifolds and the refrigerant outlet is provided on the other, the refrigerant inlet and the refrigerant outlet are respectively located at two ends of the manifold in an extension direction, and each manifold is provided with at least one first liquid separator, so as to separate the manifold into at least two first cavities by the first liquid separator, and the plurality of first cavities are arranged sequentially along the extension direction of the manifold;

[0007] Among them, at least one through hole is provided on the first liquid separating spacer, and the through hole connects two adjacent first cavities. From the refrigerant inlet to the refrigerant outlet, the total area of ​​the through holes on the first liquid separating spacer increases successively.

[0008] In some possible designs, a second liquid separator is provided in the first cavity connected to the refrigerant inlet, and the second liquid separator is parallel to the first liquid separator to separate the first cavity into two second cavities.

[0009] In some possible designs, a first card slot and a second card slot are relatively arranged on the collecting pipe, the first card slot and the second card slot are both connected to the first cavity, the first liquid-separating spacer and the second liquid-separating spacer both include a first card-engaging portion and a second card-engaging portion, the first card-engaging portion is engaged with the first card slot, and the second card-engaging portion is engaged with the second card slot to fix the first liquid-separating spacer or the second liquid-separating spacer on the collecting pipe.

[0010] In some possible designs, the first engaging portion and the first engaging slot are interference fit, and / or the second engaging portion and the second engaging slot are interference fit.

[0011] In some possible designs, the first liquid-separating spacer and the second liquid-separating spacer both further include a main body, the main body including two first side walls arranged opposite to each other, and two second side walls arranged opposite to each other, the two first side walls are respectively connected to the two ends of the second side wall, the two first side walls are respectively connected to the first clamping part and the second clamping part, and the two second side walls are both in contact with the inner wall of the collecting pipe.

[0012] In some possible designs, the first engaging portion and the second engaging portion have different lengths in the extension direction of the first side wall.

[0013] In some possible designs, the first snap-fitting portion and the second snap-fitting portion are both rectangular sheets, and in the extension direction of the first side wall, the length of the first snap-fitting portion is greater than the length of the second snap-fitting portion, and the length of the first snap-fitting portion is equal to the inner diameter of the collecting pipe, and the first snap-fitting portion and the second snap-fitting portion both extend at least partially outside the collecting pipe.

[0014] In some possible designs, the through hole is located on a side of the first liquid separation spacer close to the heat exchange tube.

[0015] In some possible designs, the number of the through holes on the first liquid separation spacer increases sequentially from the refrigerant inlet to the refrigerant outlet.

[0016] A second aspect of an embodiment of the present application provides a water heating device, comprising an inner tank and the microchannel heat exchanger described in any one of the first aspects, wherein the microchannel heat exchanger is wound around the outside of the inner tank.

[0017] In the microchannel heat exchanger and hot water equipment provided by the present application, at least one first liquid separator is provided in each of the two collecting pipes of the microchannel heat exchanger, and the collecting pipe is divided into at least two first cavities by the first liquid separator. The first cavities are arranged in sequence along the extension direction of the collecting pipe. After the refrigerant enters the collecting pipe through the refrigerant inlet, it flows through all the first cavities of the collecting pipe through the heat exchange pipe, and finally leaves the collecting pipe from the refrigerant outlet. At least one through hole is provided on the first liquid separator, and the through hole connects the two adjacent first cavities. From the refrigerant inlet to the refrigerant outlet, after the refrigerant enters the collecting pipe, most of the liquid refrigerant collected in the first cavity can be transferred to the lower chamber through the through hole. A first cavity, and as the heat exchange proceeds, the gaseous refrigerant is continuously liquefied, and the proportion of liquid refrigerant in the first cavity further back is higher. From the refrigerant inlet to the refrigerant outlet, the total area of ​​the through holes on the first liquid separator increases successively, that is, the ability to transfer liquid refrigerant is gradually improved, which can adapt to the state change of the refrigerant during the heat exchange process, increase the dryness of the refrigerant in the heat exchange tube, reduce the heat transfer thermal resistance of the gaseous refrigerant in the heat exchange tube, and improve the condensation efficiency of the gaseous refrigerant. At the same time, most of the liquid refrigerant is directly transferred to the next first cavity through the through holes, which is also beneficial to reduce the flow resistance of the gaseous refrigerant in the heat exchange tube connected to the first cavity, reduce power consumption, and improve heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0019] Figure 1 A schematic structural diagram of a microchannel heat exchanger provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the partial structure of a microchannel heat exchanger provided in an embodiment of the present application;

[0021] Figure 3 for Figure 2 Schematic diagram of the exploded structure of the microchannel heat exchanger;

[0022] Figure 4 Schematic diagram of the distribution of refrigerant in the manifold;

[0023] Figure 5 A perspective view of a header in a microchannel heat exchanger provided in an embodiment of the present application;

[0024] Figure 6 A schematic structural diagram of the first liquid separation spacer in the microchannel heat exchanger provided in an embodiment of the present application;

[0025] Figure 7 A perspective view of the manifold, first liquid separation spacer, and heat exchange tubes in the microchannel heat exchanger provided in an embodiment of the present application.

[0026] Reference numerals:

[0027] 100-collecting pipe;

[0028] 110-Refrigerant inlet;

[0029] 120-refrigerant outlet;

[0030] 130-first card slot;

[0031] 140-second card slot;

[0032] 150-first cavity;

[0033] 200-heat exchange tube;

[0034] 300-first separation septum;

[0035] 310-through hole;

[0036] 320-first engaging portion;

[0037] 330- second engaging portion;

[0038] 340-main body;

[0039] 341- second side wall;

[0040] 342-first side wall;

[0041] 400-Second separator.

[0042] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] The terms "first," "second," "third," "fourth," and so forth (if any) in the specification and claims of this application and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the application described herein can, for example, be implemented in an order other than that illustrated or described herein.

[0045] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0046] A microchannel heat exchanger generally includes two manifolds and multiple microchannel flat tubes. The two ends of the microchannel flat tubes are connected to two manifolds respectively, so that the refrigerant flows between the manifolds and the microchannel flat tubes to exchange heat with the water in the inner tank.

[0047] The manifold can be divided into multiple cavities by arranging spacers in the manifold, and through holes are provided on the spacers. The separation of gaseous refrigerant and liquid refrigerant is achieved by the gravity of the refrigerant and the upper and lower pressure difference of the spacers. However, due to the differences in refrigerant dryness, pressure, and flow rate, the distribution states of gaseous refrigerant and liquid refrigerant in the manifold are diverse. That is, as the heat exchange proceeds, the degree of liquefaction of the refrigerant in different cavities is different, and the dryness varies greatly. Using the same spacer cannot adapt to the state changes of the refrigerant during the heat exchange process, and will cause part of the gaseous refrigerant to enter the next cavity through the through holes on the spacer, resulting in poor heat exchange performance of the system. In the cavity close to the outlet side, it is easy to cause poor separation of gaseous and liquid refrigerants.

[0048] Therefore, simply providing through holes on the spacer can easily lead to problems such as incomplete liquid separation or loss of gas-phase refrigerant, and has limited effect on improving heat exchange performance.

[0049] In this regard, an embodiment of the present application provides a microchannel heat exchanger, in which the total area of ​​the through holes on the first liquid separator gradually increases from the refrigerant inlet to the refrigerant outlet, which can effectively adapt to the state changes of the refrigerant. On the side close to the refrigerant inlet, the loss of gaseous refrigerant is reduced, and on the side close to the refrigerant outlet, the gas-liquid separation effect is improved, thereby effectively improving the heat exchange performance.

[0050] It is understandable that the microchannel heat exchanger provided in the embodiment of the present application can be applied to hot water equipment, and can also be applied to other locations where a heat exchanger is required, and this embodiment does not limit it.

[0051] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0052] See Figure 1 、 Figure 2 and Figure 3 As shown, this embodiment provides a microchannel heat exchanger, including two oppositely arranged headers 100 and a plurality of heat exchange tubes 200.

[0053] A refrigerant inlet 110 and a refrigerant outlet 120 are respectively provided at both ends of the manifold 100 in its extension direction. Specifically, the entire microchannel heat exchanger is provided with only one refrigerant inlet 110 and one refrigerant outlet 120. The refrigerant inlet 110 and the refrigerant outlet 120 can be provided on two separate manifolds 100 or on the same manifold 100, as long as they are located at both ends of the manifold 100 in its extension direction.

[0054] Taking the arrangement on the same manifold 100 as an example, the manifold 100 is placed vertically, with a refrigerant inlet 110 disposed on the top and a refrigerant outlet 120 disposed on the bottom.

[0055] At least one first liquid separator 300 is provided in each manifold 100 to separate the manifold 100 into at least two first cavities 150 through the first liquid separator 300. The first cavities 150 are arranged in sequence along the extension direction of the manifold 100, that is, the manifold 100 is divided into multiple first cavities 150 arranged in an upper and lower relationship, and multiple heat exchange tubes 200 are arranged in sequence along the extension direction of the manifold 100 so that the refrigerant flows through all the first cavities 150 of the manifold 100 through the heat exchange tubes 200.

[0056] It is understandable that each manifold 100 may be provided with one or more first liquid separation spacers 300 , which may be selected based on the length and operating conditions of the manifold 100 , and this embodiment does not limit this.

[0057] Among them, at least one through hole 310 is provided on the first liquid separator 300, and the through hole 310 connects two adjacent first cavities 150. From the refrigerant inlet 110 to the refrigerant outlet 120, the total area of ​​the through holes on the first liquid separator 300 increases successively, that is, the through hole 310 has a fluid inlet for the refrigerant to flow in and a fluid outlet for the refrigerant to flow out. From the refrigerant inlet 110 to the refrigerant outlet 120, the total area of ​​the fluid inlet on the first liquid separator 300 increases successively.

[0058] It is understandable that the total area of ​​the through holes increases sequentially, which may be caused by an increase in the number of through holes 310 or an increase in the size of the through holes 310 , and this embodiment does not limit this.

[0059] The gaseous refrigerant continuously condenses in the heat exchange tubes 200 of the microchannel heat exchanger. As the gaseous refrigerant condenses, the liquid refrigerant content in the heat exchange tubes 200 gradually increases, meaning the refrigerant's dryness continuously decreases. Under the influence of gravity, the liquid refrigerant preferentially adsorbs onto the inner pore walls of the heat exchange tubes 200, gradually forming a liquid film on the inner pore walls of the heat exchange tubes 200. Because the viscosity of the liquid refrigerant is greater than that of the gaseous refrigerant, resistance increases. Simultaneously, the liquid refrigerant separates the inner pore walls of the heat exchange tubes 200 from the gaseous refrigerant, increasing the thermal resistance between the gaseous refrigerant and the heat exchange tubes 200 and decreasing the gaseous refrigerant's heat transfer coefficient. This embodiment provides through holes 310 of different apertures or sizes on the first liquid separator 300 at a specified position, thereby discharging most of the liquid refrigerant collected in the first cavity 150 to the next process, thereby improving the dryness of the refrigerant in the heat exchange tube 200, reducing the heat transfer thermal resistance of the gaseous refrigerant in the heat exchange tube 200, and improving the condensation efficiency of the gaseous refrigerant. At the same time, the improvement of the refrigerant dryness is also beneficial to reducing the resistance of the gaseous refrigerant in the heat exchange tube 200, reducing system power consumption, and improving system heat exchange efficiency.

[0060] In some embodiments, when the refrigerant just enters the collecting pipe, it is basically in a gaseous state, and the liquid refrigerant content is extremely low. At this time, liquid separation is not required. A second liquid separation spacer 400 can be set in the first cavity 150 connected to the refrigerant inlet. The second liquid separation spacer 400 is parallel to the first liquid separation spacer 300 to separate the first cavity 150 into two second cavities.

[0061] The second liquid separation spacer 400 is not provided with a hole, the two second cavities are completely separated, and the second cavity is only connected to the heat exchange tube 200 to transmit the refrigerant.

[0062] Exemplarily, one of the two manifolds 100 is provided with a first liquid separator 300 and a second liquid separator 400, which divide the manifold 100 into cavity one, cavity two and cavity three in sequence along the flow direction of the refrigerant. A first liquid separator 300 is provided in the other manifold 100, which divides it into cavity four and cavity five along the flow direction of the refrigerant. The first liquid separator 300 is located between the first liquid separator 300 and the second liquid separator 400 in the previous manifold 100. Along the direction in which the refrigerant passes through the manifold 100, the total area of ​​the through holes of the two first liquid separators 300 gradually increases, that is, the total area of ​​the through holes on the first liquid separator 300 adjacent to the refrigerant outlet is greater than the total area of ​​the through holes on the other first liquid separator 300. Cavity one is connected to cavity four through at least one heat exchange tube 200 to form a first process A, cavity four is connected to cavity two through at least one heat exchange tube 200 to form a second process B, cavity two is connected to cavity five through at least one heat exchange tube 200 to form a third process C, cavity five is connected to cavity three through at least one heat exchange tube 200 to form a fourth process D, that is, the sum of the first liquid separator 300 and the second liquid separator 400 of the entire microchannel heat exchanger is always one less than the number of processes, the refrigerant inlet 110 is connected to cavity one, and the refrigerant outlet 120 is connected to cavity three, so that the refrigerant enters cavity one from the refrigerant inlet 110, passes through the first process A, the second process B, the third process C and the fourth process D in sequence, and finally leaves from the refrigerant outlet 120.

[0063] When the refrigerant enters the first flow path, it is essentially in a gaseous state. At this point, there are no through-holes in the second liquid-separating spacer 400. As the refrigerant exchanges heat, the liquid refrigerant gradually increases. Therefore, the total area of ​​the through-holes is increased sequentially from the second flow path B to the fourth flow path D to adapt to the refrigerant's state. When the refrigerant enters the corresponding cavity, gas-liquid separation is effectively performed, allowing the gaseous refrigerant to enter the heat exchange tube 200, while the liquid refrigerant enters the first cavity 150 corresponding to the next flow path through the through-hole 310. Of course, gas-liquid separation here does not simply mean complete separation; it suffices to say that most separation is possible.

[0064] See Figure 4 As shown, in order to more intuitively reflect the state change of the refrigerant in the manifold 100 in this embodiment, this embodiment provides a schematic diagram of the distribution state of the refrigerant in the manifold 100.

[0065] Depend on Figure 4It can be seen that when the refrigerant enters the first cavity 150 in the manifold 100 on the other side from a first cavity 150 of the manifold 100 on one side, due to heat exchange with the inner tank, when it is about to reach the other manifold 100, the vapor volume fraction of the refrigerant is small and contains more liquid refrigerant. After reaching the first cavity 150 of the other manifold 100, the liquid will pass through the through hole 310 on the first liquid separator 300 and directly enter the next first cavity 150, while the gaseous refrigerant enters the heat exchange tube 200, so that the vapor volume fraction of the refrigerant entering the heat exchange tube 200 is large, and the refrigerant passing through the first liquid separator 300 is basically liquid refrigerant, which can achieve a better liquid separation effect.

[0066] In some embodiments, see Figure 5 、 Figure 6 and Figure 7 As shown, the manifold 100 is provided with a first card slot 130 and a second card slot 140 opposite to each other. The first card slot 130 and the second card slot 140 are arranged opposite to each other and are both connected to the first cavity 150. The first liquid-separating spacer 300 and the second liquid-separating spacer 400 both include a first card-fitting portion 320 and a second card-fitting portion 330. The first card-fitting portion 320 is connected to the first card slot 130, and the second card-fitting portion 330 is connected to the second card slot 140. Thus, the first liquid-separating spacer 300 or the second liquid-separating spacer 400 is fixed on the manifold 100 through the cooperation between the first card-fitting portion 320 and the first card slot 130 and the cooperation between the second card-fitting portion 330 and the second card slot 140.

[0067] After the first engaging portion 320 is inserted into the first engaging slot 130 and the second engaging portion 330 is inserted into the second engaging slot 140 , positioning can be performed to facilitate welding. Furthermore, welding can be performed from the outside to facilitate operation and reduce the risk of leakage.

[0068] In addition, at least one of the first engaging portion 320 and the first engaging slot 130 and the second engaging portion 330 and the second engaging slot 140 is in interference fit.

[0069] It is understandable that as long as one of them is an interference fit, a good positioning effect can be achieved, which facilitates welding of the first liquid-separating spacer 300 and the manifold 100, or the second liquid-separating spacer 400 and the manifold 100. However, it is preferably that the first engaging portion 320 and the first engaging groove 130, and the second engaging portion 330 and the second engaging groove 140 are both interference fit. Specifically, the manifold 100 and the first liquid-separating spacer 300 and the second liquid-separating spacer 400 are connected by an interference fit, so that during welding, the first liquid-separating spacer 300 will not shift relative to the manifold 100, and the first liquid-separating spacer 300 and the manifold 100 can be welded directly from the outside of the manifold 100, which facilitates operation, reduces welding difficulty, and also helps reduce the risk of leakage at the connection.

[0070] In some embodiments, after the first liquid separator 300 is inserted into the first card slot 130 and the second card slot 140, the gap between the first liquid separator 300 and the inner wall of the collecting tube 100 can be used as a through hole 310, so that the area of ​​the fluid inlet can be controlled by controlling the size of the first liquid separator 300.

[0071] In some embodiments, the first liquid separator 300 and the second liquid separator 400 also include a main body 340, and the main body 340 includes two first side walls 342 arranged opposite to each other, and two second side walls 341 arranged opposite to each other. The two first side walls 342 are respectively connected to the two ends of the second side wall, that is, the first side wall 342 and the second side wall 341 enclose the outer edge of the main body 340, and the two first side walls 342 are respectively connected to the first clamping part 320 and the second clamping part 330, and the two second side walls 341 are both fitted with the inner wall of the collecting tube, that is, the second side wall 341 is adapted to the shape of the corresponding position of the collecting tube 100, and the second side wall 341 can be set to an arc shape to better fit with the inner wall of the collecting tube 100.

[0072] This arrangement can reduce leakage at the connection between the collecting pipe 100 and the first liquid separator 300 and the second liquid separator 400, allowing the liquid refrigerant to enter the next first cavity 150 through the through hole 310 as much as possible, so that the refrigerant passage condition of the first liquid separator 300 corresponding to each process can be controlled through the through hole 310, thereby improving the gas-liquid separation effect.

[0073] It is understandable that the first liquid separation spacer 300 and the second spacer 400 can be configured to have the same shape, except that the second spacer 400 is not provided with the through hole 310 , while the first spacer 300 is provided with the through hole 310 .

[0074] Furthermore, the first engaging portion 320 and the second engaging portion 330 have different widths, where the width refers to the length of the first engaging portion 320 and the second engaging portion 330 in the extending direction of the first side wall 342 .

[0075] Exemplarily, the width of the first engaging portion 320 is greater than the width of the second engaging portion 330 .

[0076] Specifically, the second engaging portion 330 has a small width and can smoothly pass through the first engaging slot 130 into the manifold 100 , then reach the second engaging slot 140 and be inserted into the second engaging slot 140 .

[0077] In addition, the maximum width of the first card slot 130 can be made equal to the inner diameter of the collecting tube 100, so that the main body 340 can pass through the first card slot 130 and enter the collecting tube 100. That is, during installation, just insert the second card slot 330 into the first card slot 130 first, and then continue to push the first liquid separator 300 until the first card slot 320 is completely inserted into the first card slot 130.

[0078] To facilitate processing, the first and second liquid-separating spacers 300 and 400 can be thin aluminum sheets. The first and second engaging portions 320 and 330 are both rectangular sheets. The second sidewall 341 of the main body 340 is shaped to match the inner wall of the manifold 100. The first and second engaging portions 320, 330, and main body 340 have the same thickness. Specifically, the manifold 100 has a circular cross-section, the width of the first engaging portion 320 is equal to the inner diameter of the manifold 100, and both corners of the first engaging portion 320 facing away from the main body 340 can be rounded or chamfered. The chamfer radius or chamfer distance is preferably less than 2 mm. After the first engaging portion 320 is inserted into the first slot 130, a portion of the chamfer remains outside the manifold 100, facilitating operation. Furthermore, the lengths of the first and second engaging portions 320, 330, and 330 can be substantially consistent with the wall thickness of the manifold 100.

[0079] Of course, the size limitation in this example does not mean complete consistency, and processing errors are allowed to exist within a certain range. Of course, this is a problem that technicians in this field often encounter during the processing, and this embodiment does not limit it here.

[0080] In some embodiments, the through hole 310 is located on a side of the first liquid separating spacer 300 close to the heat exchange tube 200 .

[0081] When the gas-liquid two-phase refrigerant of the previous process of the microchannel heat exchanger flows out into the first cavity 150 of the collector through the heat exchange tube 200, due to the combined effects of gravity and viscosity coefficient, the gaseous refrigerant gathers on the side of the first cavity 150 away from the heat exchange tube 200, and the liquid refrigerant gathers on the side of the first cavity 150 close to the heat exchange tube 200. The liquid separator can better separate the liquid refrigerant by opening a through hole 310 on the side close to the heat exchange tube 200, thereby minimizing the impact on the normal flow of the gaseous refrigerant.

[0082] When welding the first liquid-separating spacer 300 and the collecting pipe 100, if the through hole 310 is close to the edge of the first liquid-separating spacer 300, if the aperture of the through hole 310 is small, it is easy for the through hole 310 to be completely blocked by the solder due to the capillary action of the solder, thereby losing the liquid-separating effect. Even if the aperture is large, the through hole 310 is easy to be partially blocked due to the flow of solder.

[0083] To this end, the diameter and position of the through hole 310 may be appropriately adjusted to avoid the above situation.

[0084] For example, the through hole 310 can be set as a circular hole with an inner diameter of 2-3 mm, and the shortest distance between the edge of the through hole 310 adjacent to the second engaging portion 330 and the edge of the second engaging portion 330 away from the first engaging portion 320 is generally greater than 2 mm.

[0085] For example, the through hole 310 may be arranged in a polygonal shape, such as a rectangle, a hexagon, etc.

[0086] It is understandable that the through hole 310 can be set to any shape, depending on the processing convenience and adaptability to the working conditions, and this embodiment does not limit it.

[0087] An embodiment of the present application also provides a water heating device, which includes an inner tank and the microchannel heat exchanger in the above embodiment.

[0088] Specifically, the manifold 100 is fixed on the inner liner, and the extending direction of the manifold 100 is preferably the same as the extending direction of the inner liner, while the heat exchange tube 200 is wound around the outside of the inner liner and completely fits the outer surface of the inner liner for heat exchange.

[0089] It is understandable that the hot water equipment may also include a heat pump and other structures, which are well known to those skilled in the art and will not be described in detail in this embodiment.

[0090] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the scope of protection of the present application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A microchannel heat exchanger, comprising two manifolds (100) arranged opposite to each other and a plurality of heat exchange tubes (200) for connecting the two manifolds (100), wherein one of the two manifolds (100) is provided with a refrigerant inlet (110) and a refrigerant outlet (120), or one of the two manifolds (100) is provided with the refrigerant inlet (110) and the other is provided with the refrigerant outlet (120), wherein the refrigerant inlet (110) and the refrigerant outlet (120) are respectively located at two ends of the extending direction of the manifold (100), characterized in that: At least one first liquid-separating spacer (300) is provided in each manifold (100), so as to separate the manifold (100) into at least two first cavities (150) through the first liquid-separating spacer (300), and the plurality of first cavities (150) are sequentially arranged along the extension direction of the manifold (100); Among them, at least one through hole (310) is provided on the first liquid separation spacer (300), and the through hole (310) connects two adjacent first cavities (150). From the refrigerant inlet (110) to the refrigerant outlet (120), the total area of ​​the through holes (310) on the first liquid separation spacer (300) increases successively.

2. The microchannel heat exchanger according to claim 1, characterized in that: A second liquid separation spacer (400) is provided in the first cavity (150) connected to the refrigerant inlet (110), and the second liquid separation spacer (400) is parallel to the first liquid separation spacer (300) to separate the first cavity (150) into two second cavities.

3. The microchannel heat exchanger according to claim 2, characterized in that: The manifold (100) is provided with a first card slot (130) and a second card slot (140) opposite to each other. The first card slot (130) and the second card slot (140) are both connected to the first cavity (150). The first liquid-separating spacer (300) and the second liquid-separating spacer (400) both include a first card-engaging portion (320) and a second card-engaging portion (330). The first card-engaging portion (320) is engaged with the first card slot (130), and the second card-engaging portion (330) is engaged with the second card slot (140), so as to fix the first liquid-separating spacer (300) or the second liquid-separating spacer (400) on the manifold (100).

4. The microchannel heat exchanger according to claim 3, characterized in that: The first engaging portion (320) is interference-fitted with the first engaging slot (130), and / or the second engaging portion (330) is interference-fitted with the second engaging slot (140).

5. The microchannel heat exchanger according to claim 3, characterized in that: The first liquid-separating spacer (300) and the second liquid-separating spacer (400) both further include a main body (340), the main body (340) including two first side walls (342) arranged opposite to each other, and two second side walls (341) arranged opposite to each other, the two first side walls (342) being respectively connected to the two ends of the second side wall (341), the two first side walls (342) being respectively connected to the first clamping portion (320) and the second clamping portion (330), and the two second side walls (341) being both in contact with the inner wall of the collecting pipe (100).

6. The microchannel heat exchanger according to claim 5, characterized in that: The first engaging portion (320) and the second engaging portion (330) have different lengths in the extension direction of the first side wall (342).

7. The microchannel heat exchanger according to claim 6, characterized in that: The first engaging portion (320) and the second engaging portion (330) are both rectangular sheets. In the extension direction of the first side wall (342), the length of the first engaging portion (320) is greater than the length of the second engaging portion (330), and the length of the first engaging portion (320) is equal to the inner diameter of the manifold (100). The first engaging portion (320) and the second engaging portion (330) both at least partially extend outside the manifold (100).

8. The microchannel heat exchanger according to any one of claims 1 to 7, characterized in that: The through hole (310) is located on a side of the first liquid separation spacer (300) close to the heat exchange tube (200).

9. The microchannel heat exchanger according to any one of claims 1 to 7, characterized in that: The number of the through holes (310) on the first liquid separation spacer (300) increases sequentially from the refrigerant inlet (110) to the refrigerant outlet (120).

10. A water heating device, characterized in that: It comprises an inner liner and the microchannel heat exchanger according to any one of claims 1 to 9, wherein the microchannel heat exchanger is arranged around the outside of the inner liner.

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