Micro-channel flat tube, heat exchanger and air conditioner

Abstract

The utility model relates to the technical field of air conditioners, in particular to a microchannel flat tube, a heat exchanger and an air conditioner, the microchannel flat tube comprises a first tube wall, a second tube wall and a third tube wall which are sequentially stacked, a first channel is defined between the first tube wall and the second tube wall, and a second channel is defined between the second tube wall and the third tube wall; at least one of the two ports of the first channel is a first closed port, a first opening communicated with the first channel is formed in the position, close to the first closed port, of the first pipe wall, the width of the first opening extends in the width direction of the flat pipe, and the length of the first opening extends in the length direction of the flat pipe. The distance between the first opening and the end face of the first closed port is larger than or equal to the width or depth of the first channel. The problems that when a multi-layer micro-channel flat pipe is used for flowing of different media, welding leakage occurs, and the machining precision of an existing multi-layer micro-channel flat pipe is difficult to guarantee are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioning technical field especially relates to a kind of microchannel flat tube, heat exchanger and air conditioner. BACKGROUND

[0002] Ordinary double-layer flat tube microchannel pipe is the form of two head through hole after processing, when using and different medium respectively flow through different channel, length processing is carried out to flat tube, and part flat tube is cut to end portion, it is installed in heat exchanger whole and welded.But the area of machining used by flat tube is too large, flatness is difficult to guarantee, affect subsequent assembly, and after machining flat tube, middle layer wall is prone to thin, strength decreases, after welding, it is easy to deform, if thickening middle layer wall, then affect heat exchange at this place, middle layer wall thickening also makes flat tube total thickness become large, reduce the number of fin arrangement, thereby affect the heat exchange efficiency of whole heat exchanger. SUMMARY

[0003] The utility model provides a kind of microchannel flat tube, heat exchanger and air conditioner to solve one of the defects in prior art, solve the welding leakage of existing multilayer microchannel flat tube when being used for different medium flow and the problem that the machining precision of existing multilayer microchannel flat tube is difficult to guarantee.

[0004] The utility model provides a kind of microchannel flat tube, including first tube wall, second tube wall and third tube wall that are sequentially stacked, first tube wall and second tube wall are surrounded and are out of first channel, second tube wall and third tube wall are surrounded and are out of second channel, at least one of the two ports of first channel is first closed port;

[0005] First tube wall is equipped with the first opening of intercommunication with first channel in the position close to first closed port, the width of first opening extends along the width direction of flat tube, the length of first opening extends along the length direction of flat tube, the spacing between first opening and the end surface of first closed port is greater than or equal to the width or depth of first channel.

[0006] According to the micro-channel flat tube, the port corresponding to the first closed port of the second channel is a second closed port, the third pipe wall is provided with a second opening in communication with the second channel, the second opening is arranged between the second closed port and the first opening close to the second closed port, the width of the second opening extends along the width direction of the flat tube, and the length of the second opening extends along the length direction of the flat tube. Only part of the second side plate or part of the second side plate and part of the second partition plate at the corresponding position need to be removed, the cutting amount is greatly reduced, the second pipe wall does not need to be cut, the thickness of the second pipe wall can be ensured, the strength of the second opening as the cut position is higher, and the flat tube can be made thinner. Moreover, the flatness of the second opening machined on the third pipe wall is better ensured, the machining efficiency is high, and the problem that the machining precision of the existing multilayer micro-channel flat tube is difficult to ensure is solved.

[0007] According to the micro-channel flat tube, the interval of the first opening and the second opening along the length direction of the flat tube is greater than or equal to the width or depth of the first channel. The interval can be used as a welding position, the setting form of the second opening can greatly reduce the machining surface area, improve the machining efficiency, and ensure the flatness of the third pipe wall.

[0008] According to the micro-channel flat tube, the end face of the open port of the two ports of the second channel is flush with the end face of the first closed port corresponding thereto. The end face of the first closed port is the end face of the first channel, the end face of the open port of the second channel is the end face of the second channel, and the end face of the open port of the second channel formed at the corresponding position is flush with the end face of the first closed port.

[0009] According to the micro-channel flat tube, the end face of the open port of the two ports of the second channel is flush with the end face of the first closed port corresponding thereto. The end face of the first closed port is the end face of the first channel, the end face of the open port of the second channel is the end face of the second channel, and the end face of the open port of the second channel formed at the corresponding position is flush with the end face of the first closed port.

[0010] According to the micro-channel flat tube, at least one of the first opening and the second opening penetrates along the width direction of the flat tube. The first opening and the second opening penetrating in the width direction of the flat tube are more convenient to manufacture.

[0011] The utility model provides a kind of microchannel flat tube provided by the utility model, the first channel and the second channel are multiple, the first opening through part the first channel, the second opening through part the second channel.According to the flow of first medium and second medium is different, or property is different, for the different position of microchannel flat tube and heat exchanger application scene, the actual flow number of first channel and second channel and medium flow position are selected, it is shown that the first opening and the second opening of different position, the first opening and the second opening of different width.

[0012] The utility model provides a kind of microchannel flat tube provided by the utility model, the end structure of the first channel and the second channel is symmetric structure.Microchannel flat tube is usually symmetric structure, i.e. the end structure of first channel one end is same in other end, the end structure of second channel one end is same in other end, adapts the composition form of distributor.

[0013] The utility model further provides a kind of heat exchanger, including the microchannel flat tube as described above.

[0014] The utility model further provides a kind of air conditioner, including the microchannel flat tube as described above or the heat exchanger as described above.

[0015] The above one or more technical solutions in the utility model embodiment, at least have one of following technical effects:

[0016] The microchannel flat tube of the utility model embodiment is mainly composed of a first tube wall, a second tube wall and a third tube wall, the length, width and thickness directions of the flat tube are the length, width and thickness directions of the first tube wall, the second tube wall and the third tube wall, the first tube wall, the second tube wall and the third tube wall are sequentially stacked along the thickness direction of the flat tube, the first tube wall and the second tube wall enclose the first channel for the flow of the first medium, the second tube wall and the third tube wall enclose the second channel for the flow of the second medium, i.e. the first channel and the second channel are stacked along the thickness direction of the flat tube, and the flow directions of the media in the first channel and the second channel are both the length direction of the flat tube.

[0017] The first tube wall is mainly composed of a first side plate and a first partition plate, the second tube wall is mainly composed of a second side plate and a second partition plate, the first partition plate is arranged on the first side plate and connected with the second tube wall, each first channel is separated by the first partition plate, the second partition plate is arranged on the second side plate and connected with the second tube wall, each first channel is separated by the first partition plate, and each second channel is separated by the second partition plate.

[0018] The micro-channel flat tube in the utility model can seal at least one of the two ports of the first channel to form a first closed port, and then process a first opening on the first tube wall near the first closed port, the first opening being in communication with the first channel and being used for the first medium to enter or exit the first channel, the width and length directions of the first opening being the width and length directions of the flat tube.

[0019] The utility model seals the port of the first channel and processes a first opening on the first tube wall near the first closed port, so that the first opening serves as the first medium flow port of the first channel, compared with the prior art, when the first channel is manufactured and processed, the first tube wall is removed along the length direction of the flat tube, and in order to ensure the flatness of the welding surface, the surface of the second tube wall near the first tube wall is also removed to a certain depth, the utility model only needs to remove part of the first side plate or part of the first side plate and part of the first partition plate at the corresponding position, the cutting amount is greatly reduced, and the second tube wall is not cut, so that the thickness of the second tube wall is not affected, the first opening has higher strength as the cutting position, the flat tube can be made thinner, and the flatness of the first tube wall when the first opening is processed is better ensured, the processing efficiency is high, and the problem that the processing precision of the prior art multilayer micro-channel flat tube is difficult to ensure is solved.

[0020] The utility model changes the welding position of the second channel of the micro-channel flat tube and the inner tube body of the distribution pipe to the first tube wall and the third tube wall, compared with the prior art, the third tube wall and the second tube wall with reduced thickness caused by cutting processing, the utility model can ensure the structural strength of the welding position of the micro-channel flat tube and the inner tube body of the distribution pipe, avoid welding deformation of the second channel, keep good tolerance of the welding outer contour size after processing, and prevent leakage, so that the problem of welding leakage of the prior art multilayer micro-channel flat tube when used for different medium flow is solved.

[0021] The first opening needs to be a distance away from the end face of the first closed port, the distance being at least the width or depth of the first channel, in the case that the port of the second channel corresponding to the first closed port is an open port, the distance between the first opening and the open port of the second channel is at least the width or depth of the first channel, and the interval can serve as the welding position, the setting form of the first opening can greatly reduce the processing surface area, improve the processing efficiency, and ensure the flatness of the first tube wall.

[0022] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0024] Figure 1 is a structural schematic diagram of a micro-channel flat tube of the prior art;

[0025] Figure 2 is a structural schematic diagram of a micro-channel flat tube provided by an embodiment of the present application;

[0026] Figure 3 is a structural schematic diagram of a micro-channel flat tube provided by an embodiment of the present application;

[0027] Figure 4 is a partial structural schematic diagram of a micro-channel flat tube provided by an embodiment of the present application;

[0028] Figure 5 is a partial structural schematic diagram of a micro-channel flat tube provided by an embodiment of the present application;

[0029] Figure 6 is a partial structural schematic diagram of a micro-channel flat tube provided by an embodiment of the present application;

[0030] Figure 7 is a partial structural schematic diagram of a micro-channel flat tube provided by an embodiment of the present application;

[0031] Figure 8 is a cross-sectional schematic diagram of a micro-channel flat tube provided by an embodiment of the present application;

[0032] Figure 9 is a structural schematic diagram of a first opening of a micro-channel flat tube provided by an embodiment of the present application;

[0033] Figure 10 is a structural schematic diagram of a second opening of a micro-channel flat tube provided by an embodiment of the present application;

[0034] Figure 11 is a structural schematic diagram of a second opening of a micro-channel flat tube provided by an embodiment of the present application;

[0035] Figure 12 is a structural schematic diagram of a second opening of a micro-channel flat tube provided by an embodiment of the present application.

[0036] Reference signs:

[0037] 100, first tube wall; 110, first opening; 120, first side plate; 130, first partition plate;

[0038] 200, second tube wall;

[0039] 300, third tube wall; 310, second opening; 320, second side plate; 330, second partition plate;

[0040] 400, first channel; 410, first closed port;

[0041] 500, second channel; 510, second closed port. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme in the utility model will be described clearly and completely below in combination with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the protection scope of the utility model.

[0043] In the description of the embodiments of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, which is only for the convenience of describing the embodiments of the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the embodiments of the utility model, it needs to be explained that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For the ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the utility model can be understood according to the specific circumstances.

[0045] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium.

[0046] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0047] As shown in Figure 1 and Figure 2 The micro-channel flat tube provided by the embodiments of the present application comprises a first tube wall 100, a second tube wall 200 and a third tube wall 300 which are sequentially stacked, a first channel 400 is surrounded between the first tube wall 100 and the second tube wall 200, a second channel 500 is surrounded between the second tube wall 200 and the third tube wall 300, at least one of the two ports of the first channel 400 is a first closed port 410, the first tube wall 100 is provided with a first opening 110 which is in communication with the first channel 400 at a position close to the first closed port 410, the width of the first opening 110 extends along the width direction of the flat tube, the length of the first opening 110 extends along the length direction of the flat tube, and the distance between the first opening 110 and the end face of the first closed port 410 is greater than or equal to the width or depth of the first channel 400.

[0048] The micro-channel flat tube of the embodiment of the utility model mainly comprises a first pipe wall 100, a second pipe wall 200 and a third pipe wall 300, the length, width and thickness directions of the flat tube are the length, width and thickness directions of the first pipe wall 100, the second pipe wall 200 and the third pipe wall 300, the first pipe wall 100, the second pipe wall 200 and the third pipe wall 300 are sequentially stacked along the thickness direction of the flat tube, the first pipe wall 100 and the second pipe wall 200 enclose the first channel 400 for the flow of the first medium, the second pipe wall 200 and the third pipe wall 300 enclose the second channel 500 for the flow of the second medium, that is, the first channel 400 and the second channel 500 are stacked along the thickness direction of the flat tube, and the flow directions of the media in the first channel 400 and the second channel 500 are both the length direction of the flat tube.

[0049] The first pipe wall 100 mainly comprises a first side plate 120 and a first partition plate 130, the second pipe wall 200 mainly comprises a second side plate 320 and a second partition plate 330, the first partition plate 130 is arranged on the first side plate 120 and connected with the second pipe wall 200, each first channel 400 is separated by the first partition plate 130, the second partition plate 330 is arranged on the second side plate 320 and connected with the second pipe wall 200, each first channel 400 is separated by the first partition plate 130, and each second channel 500 is separated by the second partition plate 330.

[0050] In the manufacturing process of the utility model, at least one of the two ports of the first channel 400 can be closed to form a first closed port 410, then a first opening 110 is machined on the first pipe wall 100 close to the first closed port 410, the first opening 110 is communicated with the first channel 400, and is used for the entry and exit of the first medium in the first channel 400, and the width and length directions of the first opening 110 are the width and length directions of the flat tube.

[0051] The utility model discloses the port of first channel 400 is closed, and the first opening 110 is processed on the position of first tube wall 100 close to first closed port 410, makes the first opening 110 as the first medium flow pass of first channel 400, compared with the microchannel flat tube of prior art needs to remove the part first tube wall 100 completely from the end surface of first tube wall 100 along the length direction of flat tube when manufacturing processing first channel 400, and even needs to remove the surface below a certain depth of second tube wall 200 close to first tube wall 100 to guarantee the flatness of welding surface, the utility model only needs to remove the part first side plate 120 or part first side plate 120 and part first partition plate 130 of corresponding position, and the cutting amount is greatly reduced, and it is not necessary to cut to second tube wall 200, can guarantee the thickness of second tube wall 200 is not influenced, the strength of first opening 110 as the cut place is higher, can make flat tube to be thinner. Moreover, the flatness of first tube wall 100 processing first opening 110 is better guaranteed, and the processing efficiency is high, and the problem that the machining precision of the existing multilayer microchannel flat tube is difficult to guarantee is solved.

[0052] The utility model discloses the welding position of microchannel flat tube's second channel 500 and the inner tube body of liquid distributor changes as first tube wall 100 and third tube wall 300, compared with the third tube wall 300 of prior art and the thickness reduction flatness of second tube wall 200 that is difficult to guarantee due to cutting processing, the utility model can guarantee the structural strength of the welding position of microchannel flat tube and the inner tube body of liquid distributor, avoid the welding deformation of second channel 500, and the welding outer contour size tolerance keeps well after processing, and it is not easy to leak, and the welding leakage problem of the existing multilayer microchannel flat tube when being used for different medium flow is solved.

[0053] The first opening 110 needs to be a distance from the end surface of the first closed port 410, which is at least the width or depth of the first channel 400. In the case where the port of the second channel 500 corresponding to the first closed port 410 is an open port, the distance between the first opening 110 and the open port of the second channel 500 is at least the width or depth of the first channel 400. The space between them can be used as a welding position. The arrangement of the first opening 110 can greatly reduce the surface area for processing, improve the processing efficiency, and also ensure the flatness of the first tube wall 100.

[0054] In this embodiment, both ends of the second channel 500 are open, and the two ports of the first channel 400 can be closed as the first closed port 410 at one end and open at the other end. In other embodiments, both ports of the first channel 400 can be closed to form two first closed ports 410.

[0055] In this embodiment, the first medium and the second medium can be the same medium or different media. The first medium can be a non-phase-change medium, and the second medium can be a phase-change medium.

[0056] According to one embodiment of the present application, the product of the length and the width of the first opening 110 is greater than or equal to the total flow area of the first channel 400 and less than or equal to 10 times the total flow area of the first channel 400, and the width of the first opening 110 extends along the width direction of the flat tube. In this embodiment, the size range of the first opening 110 can affect the flow resistance of the first medium in the first channel 400, and further affect the heat exchange efficiency of the micro-channel flat tube, so the processing size of the first opening 110 has certain range requirements. The processing of the first opening 110 mainly considers two parameters, that is, the length n of the first opening 110 is the processing length along the medium flow direction, and the width p of the first opening 110 is the processing length along the width direction of the flat tube.

[0057] As shown in Figure 4 , Figure 5 , Figure 8 and Figure 9 , in this embodiment, the relationship between the length n of the first opening 110, the width p of the first opening 110 and the total flow area S of the first medium in the first channel 400 is limited, that is, S≤n×p≤10S, and more preferably 3S≤n×p≤5S. In this embodiment, S=h1×D1×a1+1 / 2×π×h12, a1 is the number of the second channel 500 through which the first medium flows, h1 is the depth of the first channel 400, and D1 is the width of the first channel 400.

[0058] According to one embodiment of the present application, the length of the first opening 110 is between 1 times and 30 times the width of the first channel 400, or between 1 times and 30 times the depth of the first channel 400, or the larger value of the two. In this embodiment, on the basis of limiting the relationship between the length n of the first opening 110, the width p of the first opening 110 and the total flow area S of the first medium in the first channel 400, the range of the length n of the first opening 110 is selected, that is, D1≤n≤30D1, or h1≤n≤30h1, or in the comparison relationship of D1≤n≤30D1 and h1≤n≤30h1, the larger n is calculated.

[0059] According to one embodiment of the utility model, the depth of the first opening 110 is greater than the thickness of the first side plate 120 and is less than or equal to the sum of the depth of the first channel 400 and 1.5 times the thickness of the first side plate 120. In this embodiment, the range of the depth m of the first opening 110 is selected based on the relationship between the length n of the first opening 110, the width p of the first opening 110, and the total area S of the first medium flowing in the first channel 400. The depth of the first opening 110 can be cut from the surface of the first side plate 120 in the direction of the second pipe wall 200, but the second pipe wall 200 cannot be completely cut, avoiding the communication between the first channel 400 and the second channel 500, i.e. b < m ≤ h1 + 1.5b, b is the thickness of the first side plate 120.

[0060] According to one embodiment of the utility model, in the case where the thickness of the second pipe wall 200 is less than or equal to 0.5 times the thickness of the first side plate 120, the depth of the first opening 110 is greater than the thickness of the first side plate 120 and is less than or equal to the sum of the thickness of the first side plate 120, the depth of the first channel 400, and 0.2 times the thickness of the second pipe wall 200. In this embodiment, generally, the depth m of the first opening 110 is required to be b < m ≤ h1 + 1.5b. Under this condition, the processing of the first opening 110 will not affect or less affect the second pipe wall 200. However, when the thickness c of the second pipe wall 200 is relatively small, the second pipe wall 200 will be cut during the processing of the first opening 110, which may cause damage to the second pipe wall 200, resulting in the communication between the first channel 400 and the second channel 500. Therefore, when the thickness c of the second pipe wall 200 is within a certain range, the depth m of the first opening 110 needs to be processed within another range. In this embodiment, when the thickness c of the second pipe wall 200 is ≤ 0.5b, b < m ≤ h1 + b + 0.2c.

[0061] As shown in Figure 3 According to one embodiment of the utility model, the port of the second channel 500 corresponding to the first closed port 410 is a second closed port 510, the third pipe wall 300 is provided with a second opening 310 in communication with the second channel 500, the second opening 310 is arranged between the second closed port 510 and the first opening 110 close to it, the width of the second opening 310 extends along the width direction of the flat pipe, and the length of the second opening 310 extends along the length direction of the flat pipe.

[0062] In the embodiment, the second channel 500 also communicates with the second opening 310 on the premise that the first channel 400 communicates with the first opening 110. In the manufacturing process of the micro-channel flat tube of the utility model, the port of the second channel 500 close to the first closed port 410 is closed to form the second closed port 510, and then the second opening 310 is machined on the position of the second tube wall 200 close to the second closed port 510, the second opening 310 communicates with the second channel 500, and is used for the entry and exit of the second medium in the second channel 500, the width and length directions of the second opening 310 are the width and length directions of the flat tube. At this time, the second medium enters the second channel 500 through the second opening 310 at one end, and then flows out of the second channel 500 through the port or the second opening 310 at the other end.

[0063] The port of the second channel 500 is closed, and the second opening 310 is machined on the position of the third tube wall 300 close to the second closed port 510, so that the second opening 310 serves as the second medium flow passage of the second channel 500. Compared with the prior art, when the second channel 500 is manufactured and processed, the part of the third tube wall 300 needs to be removed along the length direction of the flat tube from the end surface of the third tube wall 300, and in order to ensure the flatness of the welding surface, even the surface of the second tube wall 200 close to the third tube wall 300 needs to be removed by a certain depth. The utility model only needs to remove part of the second side plate 320 or part of the second side plate 320 and part of the second partition plate 330 at the corresponding position, the cutting amount is greatly reduced, and the second tube wall 200 does not need to be cut, so that the thickness of the second tube wall 200 is not affected, the strength of the second opening 310 as the cut part is higher, and the flat tube can be made thinner. Moreover, the flatness of the third tube wall 300 when the second opening 310 is machined is better guaranteed, the machining efficiency is high, and the problem that the machining precision of the prior art multilayer micro-channel flat tube is difficult to guarantee is solved.

[0064] In the embodiment, one end of the two ports of the second channel 500 can be closed as the second closed port 510, and the other end is open. In other embodiments, the two ports of the second channel 500 can also be closed to form two second closed ports 510. Whether to set the second closed port 510 depends on whether the port of the corresponding first channel 400 is the first closed port 410. If the port of the first channel 400 is an open port, the port of the corresponding second channel 500 cannot be set as an open port.

[0065] As Figure 6 and Figure 10As shown, in the embodiment, the size range of the second opening 310 is the same as that of the first opening 110. The size range of the second opening 310 can affect the flow resistance of the second medium in the second channel 500, and further affect the heat exchange efficiency of the micro-channel flat tube, and therefore the processing size of the second opening 310 has a certain range requirement. The processing of the second opening 310 mainly considers two parameters, i.e. the length k of the second opening 310 along the medium flow direction, and the width q of the second opening 310 along the width direction of the flat tube.

[0066] In the embodiment, the relationship between the length k of the second opening 310, the width q of the second opening 310, and the total area R of the second medium flowing in the second channel 500 is limited, i.e. R≤k×q≤10R, and more preferably 4R≤k×q≤7R. In the embodiment, R=h2×D2×a2+1 / 2×π×h22, a2 is the number of the second channels 500 through which the second medium flows, h2 is the depth of the second channel 500, and D2 is the width of the second channel 500.

[0067] On the basis of the relationship between the length k of the second opening 310, the width q of the second opening 310, and the total area S of the second medium flowing in the second channel 500, the range of the length k of the second opening 310 is selected, i.e. D2≤k≤30D2, or h2≤k≤30h2, or in the comparison relationship of D2≤k≤30D2 and h2≤k≤30h2, the larger k is calculated.

[0068] On the basis of the relationship between the length k of the second opening 310, the width q of the second opening 310, and the total area S of the second medium flowing in the second channel 500, the range of the depth j of the second opening 310 is selected. The depth of the second opening 310 can be cut from the surface of the second side plate 320 to the direction of the second tube wall 200, but the second tube wall 200 cannot be completely cut, so as to avoid the communication between the first channel 400 and the second channel 500, i.e. d<j≤h2+1.5d, and d is the thickness of the second side plate 320.

[0069] Generally, the depth j of the second opening 310 is required to be d<j≤h2+1.5d. Under this condition, the processing of the second opening 310 will not affect or less affect the second tube wall 200. However, when the thickness c of the second tube wall 200 is relatively small, the second tube wall 200 will be cut during the processing of the second opening 310, which may cause the damage of the second tube wall 200, and further cause the communication between the first channel 400 and the second channel 500. Therefore, when the thickness c of the second tube wall 200 is less than a certain range, the depth j of the second opening 310 needs to be ensured in another range. When the thickness c of the second tube wall 200 is ≤0.5d, d<j≤h2+d+0.2c.

[0070] According to one embodiment of the present application, the distance between the first opening 110 and the second opening 310 along the length direction of the flat tube is greater than or equal to the width or depth of the first channel 400. In this embodiment, the second opening 310 needs to be located between the end face of the second closed port 510 and the first opening 110, and the distance from the first opening 110 is at least the width or depth of the first channel 400. The distance can be used as a welding position, and the setting form of the second opening 310 can greatly reduce the surface area of processing, improve the processing efficiency, and also ensure the flatness of the third tube wall 300.

[0071] According to one embodiment of the present application, the end face of the open port of the two ports of the second channel 500 is flush with the end face of the corresponding first closed port 410. In this embodiment, since the end face of the second channel 500 is flush with the end face of the first channel 400 during the manufacturing process of the micro-channel flat tube, the end face of the first closed port 410 is the end face of the first channel 400 after the port of the first channel 400 is directly closed, and the end face of the open port of the second channel 500 is the end face of the second channel 500. The end face of the open port of the second channel 500 formed at the corresponding position is flush with the end face of the first closed port 410.

[0072] In this embodiment, the micro-channel flat tube is directly processed into a plugging state by a mold or other process during manufacturing, and then the first opening 110 is processed. In other embodiments, after the first opening 110 is normally processed during the manufacturing of the micro-channel flat tube, the port near the first opening 110 is separately plugged, and the plugging method is not limited.

[0073] According to one embodiment of the present application, the end face of the open port of the two ports of the second channel 500 is located between the end face of the first closed port 410 near it and the first opening 110. In this embodiment, since the end face of the second channel 500 is flush with the end face of the first channel 400 during the manufacturing process of the micro-channel flat tube, the end face of the first closed port 410 is the end face of the first channel 400 after the port of the first channel 400 and the corresponding port of the second channel 500 are directly closed. Then, the port of the second channel 500 is closed and cut to an open state, and the end face of the open port of the second channel 500 formed is the end face of the second channel 500. It is equivalent to cutting a notch below the end face of the first channel 400 to form the open port of the second channel 500 at the corresponding position.

[0074] In the embodiment, the port of the second channel 500 corresponding to the first closed port 410 of the first channel 400 can be closed when the first closed port 410 is closed. To ensure the normal flow of the second medium in the second channel 500, the closed part of the end surface of the second channel 500 along the length direction of the flat tube is cut off, so that the port of the second channel 500 is open to form the second opening 310. Thus, the second opening 310 is another case of the notch formed below the first closed port 410 at the end of the flat tube, the length direction of the notch is the length direction of the flat tube, the width direction of the notch is the width direction of the flat tube, and the depth direction of the notch is the thickness direction of the flat tube.

[0075] As shown in Figure 7 , Figure 11 and Figure 12 , the length g of the notch is the cutting depth of the end surface of the second channel 500 along the length direction of the flat tube. Therefore, the range of the length g of the notch should be greater than the set distance and less than the distance between the first opening 110 and the end surface of the first closed port 410, wherein the set distance A is the thickness of the closed part of the second closed port 510 of the second channel 500 along the length direction of the flat tube, the value range of the set distance A is A≥5D2 or A≥5h2, the range of the length g of the notch can be A

[0076] According to one embodiment of the utility model, at least one of the first opening 110 and the second opening 310 penetrates along the width direction of the flat tube. In the embodiment, the width of the first opening 110 is equal to the width of the entire flat tube, which means that the first opening 110 is connected with all the first channels 400 under the first tube wall 100. The width of the second opening 310 is equal to the width of the entire flat tube, which means that the second opening 310 is connected with all the second channels 500 under the third tube wall 300. The first opening 110 and the second opening 310 penetrating along the width direction of the flat tube are more convenient to manufacture.

[0077] In the embodiment, the first opening 110 and the second opening 310 can be processed by cutting and milling. Compared with the form of independent opening and connection of each channel in the prior art, the first opening 110 and the second opening 310 are uniformly processed by cutting and milling in the embodiment, which is fast and efficient, can ensure the opening consistency of each channel, and can keep the heat exchange medium flowing smoothly at the inlet and outlet of the channel, avoiding the flow resistance caused by the interval between independent openings.

[0078] According to one embodiment of the utility model, the first channel 400 and the second channel 500 are both multiple, the first opening 110 penetrates the first channel 400, and the second opening 310 penetrates the second channel 500. In the embodiment, the first partition plate 130 divides the space between the first side plate 120 and the second wall 200 into multiple first channels 400, the first opening 110 can selectively penetrate part of the first channels 400 in the arrangement direction, the second partition plate 330 divides the space between the second side plate 320 and the second wall 200 into multiple second channels 500, and the second opening 310 can selectively penetrate part of the second channels 500 in the arrangement direction.

[0079] In the embodiment, according to the flow difference or property difference between the first medium and the second medium, the actual flow number and medium flow position of the first channel 400 and the second channel 500 are selected according to the different positions of the first opening 110 and the second opening 310 and the different widths of the first opening 110 and the second opening 310. The flat tube with high opening rate is used in the place where the system heat exchange is good, and the flat tube with low opening rate is used in the place where the system heat exchange is poor. The opening rate refers to the ratio of the actual flow channel of the heat exchange medium on the flat tube to the total channel number, the higher the opening rate, the higher the ratio, and the lower the opening rate, the lower the ratio, which also means the number of channels connected with the opening.

[0080] According to one embodiment of the utility model, the end structure of the first channel 400 and the second channel 500 is a symmetrical structure. In the embodiment, the micro-channel flat tube is usually a symmetrical structure, that is, the end structure of one end of the first channel 400 is the same at the other end, and the end structure of one end of the second channel 500 is the same at the other end, which is suitable for the composition form of the distributor.

[0081] The heat exchanger provided by the utility model is described below, and the heat exchanger described below can be correspondingly referred to the micro-channel flat tube described above.

[0082] The utility model embodiment still provides a kind of heat exchanger, including the micro-channel flat tube of above-mentioned embodiment.

[0083] The air conditioner provided by the utility model is described below, and the air conditioner described below can be correspondingly referred to the micro-channel flat tube and the heat exchanger described above.

[0084] The utility model embodiment still provides a kind of air conditioner, including the micro-channel flat tube of above-mentioned embodiment or the heat exchanger of above-mentioned embodiment.

[0085] The utility model embodiment still provides the manufacturing method of micro-channel flat tube, and the micro-channel flat tube applied in above-mentioned embodiment is including:

[0086] The first pipe wall 100, the second pipe wall 200 and the third pipe wall 300 are connected to form a first channel 400 and a second channel 500;

[0087] A first opening 110 is machined on the first pipe wall 100 and communicates with the first channel 400.

[0088] According to one embodiment of the present application, before the first opening 110 is machined on the first pipe wall 100 and communicates with the first channel 400, the method further comprises:

[0089] The port of the two ports of the first channel 400 close to the first opening 110 is closed.

[0090] According to one embodiment of the present application, after the first opening 110 is machined on the first pipe wall 100 and communicates with the first channel 400, the method further comprises:

[0091] The port of the two ports of the first channel 400 close to the first opening 110 is closed.

[0092] In this embodiment, the micro-channel flat tube is directly machined into a plugging state through a mold or other processes during manufacturing, and then the first opening 110 is machined. In other embodiments, after the first opening 110 is normally machined during the manufacturing of the micro-channel flat tube, the port close to the first opening 110 is separately plugged, and the plugging method is not limited.

[0093] According to one embodiment of the present application, the manufacturing method of the micro-channel flat tube further comprises:

[0094] The port of the two ports of the second channel 500 corresponding to the first opening 110 is closed;

[0095] A second opening 310 is machined on the third pipe wall 300 and communicates with the second channel 500.

[0096] According to one embodiment of the present application, the manufacturing method of the micro-channel flat tube further comprises:

[0097] The port of the two ports of the second channel 500 corresponding to the first opening 110 is closed;

[0098] A notch is cut from the end face of the closed port of the second channel 500 along the length direction of the flat tube to form an open port of the second channel 500.

[0099] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A microchannel flat tube characterized by, The micro-channel flat tube comprises a first tube wall (100), a second tube wall (200) and a third tube wall (300) which are sequentially arranged in layers, a first channel (400) is formed between the first tube wall (100) and the second tube wall (200), and a second channel (500) is formed between the second tube wall (200) and the third tube wall (300). At least one of the two ports of the first channel (400) is a first closed port (410), the first tube wall (100) is provided with a first opening (110) which communicates with the first channel (400) at a position close to the first closed port (410), the width of the first opening (110) extends along the width direction of the flat tube, the length of the first opening (110) extends along the length direction of the flat tube, and the distance between the end face of the first opening (110) and the end face of the first closed port (410) is greater than or equal to the width or depth of the first channel (400).

2. The micro-channel flat tube of claim 1 wherein, The port of the second channel (500) corresponding to the first closed port (410) is a second closed port (600), the third tube wall (300) is provided with a second opening (310) which communicates with the second channel (500), the second opening (310) is arranged between the second closed port (600) and the first opening (110) close to the second closed port (600), the width of the second opening (310) extends along the width direction of the flat tube, and the length of the second opening (310) extends along the length direction of the flat tube.

3. The micro-channel flat tube of claim 2 wherein, The distance between the first opening (110) and the second opening (310) along the length direction of the flat tube is greater than or equal to the width or depth of the first channel (400).

4. The micro-channel flat tube of claim 1 wherein, The end face of the open port of the two ports of the second channel (500) is flush with the end face of the corresponding first closed port (410).

5. The micro-channel flat tube of claim 1 wherein, The end face of the open port of the two ports of the second channel (500) is located between the end face of the first closed port (410) close to the open port and the first opening (110).

6. The micro-channel flat tube of claim 2 wherein, At least one of the first opening (110) and the second opening (310) penetrates along the width direction of the flat tube.

7. The micro-channel flat tube of claim 2 wherein, The first channel (400) and the second channel (500) are both multiple, the first opening (110) penetrates part of the first channel (400), and the second opening (310) penetrates part of the second channel (500).

8. The micro-channel flat tube, as recited in any of claims 1 to 7, characterized by, The end structure of the first channel (400) and the end structure of the second channel (500) are both symmetrical structures.

9. A heat exchanger, characterized by The micro-channel flat tube comprises a first tube wall (100), a second tube wall (200) and a third tube wall (300) which are sequentially arranged in layers, a first channel (400) is formed between the first tube wall (100) and the second tube wall (200), and a second channel (500) is formed between the second tube wall (200) and the third tube wall (300).

10. An air conditioner characterized by comprising: The micro-channel flat tube comprises a first tube wall (100), a second tube wall (200) and a third tube wall (300) which are sequentially arranged in layers, a first channel (400) is formed between the first tube wall (100) and the second tube wall (200), and a second channel (500) is formed between the second tube wall (200) and the third tube wall (300).

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