A micro-channel flat tube, a micro-channel heat exchanger and an air conditioner

Abstract

The utility model provides a kind of microchannel flat tube, microchannel heat exchanger and air conditioner, wherein, microchannel flat tube includes microchannel flat tube body and the necking section integrally formed in the end of microchannel flat tube body, the microchannel flat tube body has more than two microchannel holes;The necking section inside is formed with the shunt cavity that each microchannel hole is communicated, and the end of the necking section has the port that the shunt cavity is communicated.According to the technical scheme of the utility model, since the necking section inside is formed with the shunt cavity that each microchannel hole is communicated, refrigerant flows into shunt cavity from port, and shunt cavity can secondary shunt the refrigerant that flows into each microchannel hole, so it can play the effect of secondary shunt, so that the shunt uniformity of each microchannel hole in microchannel flat tube can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of microchannel heat exchanger technology, specifically relating to a microchannel flat tube, a microchannel heat exchanger, and an air conditioner. Background Technology

[0002] Microchannel heat exchangers are highly efficient and compact heat exchange devices, widely used in air conditioning, refrigeration systems, and heat pumps due to their high heat exchange efficiency, light weight, and low cost. Existing reduced-diameter microchannel flat tubes directly reduce the diameter of flat tubes with microchannel orifices. After reduction, each microchannel orifice is directly connected to the inside of the manifold, leading to uneven flow distribution among the microchannel orifices. Therefore, this problem needs to be addressed. Utility Model Content

[0003] Therefore, this utility model provides a microchannel flat tube, a microchannel heat exchanger, and an air conditioner. The main technical problem to be solved is: how to improve the flow uniformity of each microchannel hole in the microchannel flat tube.

[0004] To address the aforementioned problems, this utility model provides a microchannel flat tube, comprising a microchannel flat tube body and a constricted section integrally formed at the end of the microchannel flat tube body. The microchannel flat tube body has two or more microchannel holes. The constricted section has a flow-diverting cavity formed inside, which communicates with each of the microchannel holes. The end of the constricted section has a port communicating with the flow-diverting cavity.

[0005] In some embodiments, the constricted section includes an end interface section and a gradient section connected in sequence. The constricted section is integrally formed at the end of the microchannel flat tube body through the end of the gradient section opposite to the end interface section. The inner hole of the end interface section forms the port, and the inner hole of the gradient section forms the flow divider cavity.

[0006] The gradient section gradually becomes thicker from the end interface section toward the microchannel flat tube body, and the inner hole of the gradient section gradually expands outward from the end interface section toward the microchannel flat tube body.

[0007] In some embodiments, the inner hole of the end interface section is a single channel;

[0008] And / or, the inner hole of the gradient section is a single channel.

[0009] In some embodiments, both ends of the microchannel flat tube body are provided with the aforementioned constricted sections.

[0010] This utility model also provides a microchannel heat exchanger, which includes a manifold and a microchannel flat tube as described above; the manifold is provided with an interface for communicating with an internal tube hole; the microchannel flat tube is inserted into the interface through the constricted section so as to communicate with the tube hole of the manifold through the port of the constricted section.

[0011] The number of manifolds is two, namely a first manifold and a second manifold. The first manifold is connected to one end of the microchannel flat tube, and the second manifold is connected to the other end of the microchannel flat tube.

[0012] In some embodiments, the microchannel heat exchanger further includes a limiting structure for limiting the depth to which the constricted section is inserted into the interface, so as to prevent the constricted section from being inserted into the tube hole of the manifold.

[0013] In some embodiments, when the constricted section includes an end interface section and a tapered section connected in sequence, and the constricted section is integrally formed at the end of the microchannel flat tube body through the end of the tapered section opposite to the end interface section, the inner hole of the end interface section forms the port, and the inner hole of the tapered section forms the flow-dividing cavity; and the tapered section gradually becomes thicker from the end interface section toward the microchannel flat tube body, and the inner hole of the tapered section gradually expands outward from the end interface section toward the microchannel flat tube body,

[0014] The limiting structure includes a flared section disposed at the interface. The limiting structure abuts against the outer wall of the tapered section through the inner wall of the flared section to limit the depth of the narrowed section inserted into the interface.

[0015] In some embodiments, the outer wall of the manifold is provided with a protruding connecting section, and the interface extends from the end of the connecting section into the interior of the manifold; the flared section is provided at the end of the connecting section opposite to the manifold, wherein the length of the end interface section is L3, the length of the connecting section is L2, the wall thickness of the manifold is L1, the length of the transition section is L5, and the length of the flared section is L4; wherein, L3 = L1 + L2, and L5 = L4.

[0016] In some embodiments, the microchannel heat exchanger includes a first group of microchannel flat tubes and a second group of microchannel flat tubes, both of which are composed of the microchannel flat tubes; the first manifold has a first cavity and a second cavity separated from each other, the first cavity being used to communicate with the first group of microchannel flat tubes, and the second cavity being used to communicate with the second group of microchannel flat tubes.

[0017] The microchannel heat exchanger further includes a first diverter, which has a refrigerant A inlet, a first refrigerant A outlet, and a second refrigerant A outlet connected in series. The first diverter is connected to the first cavity through the first refrigerant A outlet and to the second cavity through the second refrigerant A outlet.

[0018] In some embodiments, the microchannel heat exchanger includes a third group of microchannel flat tubes and a fourth group of microchannel flat tubes, both of which are composed of the microchannel flat tubes; the first manifold has a third cavity and a fourth cavity separated from each other, the third cavity being used to communicate with the third group of microchannel flat tubes, and the fourth cavity being used to communicate with the fourth group of microchannel flat tubes;

[0019] The microchannel heat exchanger further includes a second diverter, which has a first B refrigerant inlet, a second B refrigerant inlet, and a B refrigerant outlet that are connected in series. The second diverter is connected to the third cavity through the first B refrigerant inlet and to the fourth cavity through the second B refrigerant inlet.

[0020] In some embodiments, the first manifold and / or the second manifold are provided with a connecting cavity for two adjacent sets of microchannel flat tubes connected in series. The two sets of microchannel flat tubes connected in series through the connecting cavity are respectively a first A group of microchannel flat tubes and a second A group of microchannel flat tubes. The connecting cavity is divided into a first chamber and a second chamber by a spray plate. The connecting cavity is connected to the first A group of microchannel flat tubes through the first chamber and to the second A group of microchannel flat tubes through the second chamber.

[0021] The spray plate is provided with large-diameter spray holes and small-diameter spray holes; there are two or more small-diameter spray holes, which are arranged sequentially along the circumference of the large-diameter spray holes.

[0022] In some embodiments, both the first manifold and the second manifold are provided with baffles, and each baffle cooperates with each spray plate to allow the refrigerant to flow back and forth between the first manifold and the second manifold through different microchannel flat tubes.

[0023] This utility model also provides an air conditioner, which includes the microchannel flat tube described in any one of the above descriptions; or includes the microchannel heat exchanger described in any one of the above descriptions.

[0024] The microchannel flat tube, microchannel heat exchanger, and air conditioner provided by this utility model have the following beneficial effects:

[0025] 1. Because the constricted section has a flow distribution cavity that is connected to each microchannel hole, the refrigerant flows into the flow distribution cavity from the port. The flow distribution cavity can perform secondary flow distribution of the refrigerant flowing into each microchannel hole, thereby improving the flow distribution uniformity of each microchannel hole in the microchannel flat tube.

[0026] 2. The inner holes of both the aforementioned end interface section and the gradient section are single channels. This single channel means that there are no partition structures inside the end interface section and the gradient section. This can reduce the shrinking resistance during the shrinking process, thereby reducing the shrinking difficulty of the shrinking section, increasing the shrinking efficiency of the microchannel flat tube and reducing the scrap rate.

[0027] 3. This utility model adds a flared section at the manifold, and the flared section, in conjunction with the transition section, improves the assembly efficiency of the flat tube and the manifold while ensuring the consistency of the flat tube's position. Furthermore, the microchannel flat tube of this utility model is not inserted into the manifold, reducing interference with the flow inside the manifold and lowering the flow resistance within the manifold. Attached Figure Description

[0028] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0029] Figure 1 This is a partial front view of a microchannel flat tube according to an embodiment of the present invention;

[0030] Figure 2 This is a partial top view of a microchannel flat tube according to one embodiment of the present invention;

[0031] Figure 3 This is a partial side view of a microchannel flat tube according to one embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the structure of a microchannel heat exchanger according to an embodiment of the present invention;

[0033] Figure 5 This is a front view of the first manifold;

[0034] Figure 6 This is a side view of the first manifold;

[0035] Figure 7 This is a front view of the second manifold;

[0036] Figure 8 This is a schematic diagram illustrating the structure of the spray plate;

[0037] Figure 9 This is a schematic diagram of the structure of the first diversion component;

[0038] Figure 10 This is a schematic diagram of the second flow divider;

[0039] Figure 11 This is a schematic diagram illustrating the insertion interface of the constricted section of the microchannel flat tube.

[0040] The attached figures are labeled as follows:

[0041] 1. First diverter; 2. Second diverter; 3. First manifold; 4. Second manifold; 5. Microchannel flat tube body; 6. Fin; 7. Injection plate; 8. Partition; 9. Flared section; 10. Connecting section; 11. Interface; 12. End interface section; 13. Gradient section; 14. Microchannel hole; 15. Connecting cavity; 31. First cavity; 32. Second cavity; 33. Third cavity; 34. Fourth cavity; 71. Large-diameter injection hole; 72. 101. Small-diameter injection hole; 102. A refrigerant inlet; 103. First A refrigerant outlet; 121. Port; 123. Narrow section; 131. Diverter chamber; 151. First chamber; 152. Second chamber; 201. B refrigerant outlet; 202. First B refrigerant inlet; 203. Second B refrigerant inlet; 311. First interface; 321. Second interface; 331. Third interface; 332. Fourth interface. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0043] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0044] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0045] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0046] See also Figure 1-3 As shown, according to an embodiment of the present invention, a microchannel flat tube is provided, comprising a microchannel flat tube body 5 and a constricted section 123 integrally formed at the end of the microchannel flat tube body 5. The microchannel flat tube body 5 has two or more microchannel holes 14. The constricted section 123 has a flow-diverting cavity 131 that communicates with each microchannel hole 14, and the end of the constricted section 123 has a port 121 that communicates with the flow-diverting cavity 131.

[0047] In the above example, since the constricted section 123 has a flow distribution cavity 131 that is connected to each microchannel hole 14, the refrigerant flows into the flow distribution cavity 131 from the port 121. The flow distribution cavity 131 can perform secondary flow distribution on the refrigerant flowing into each microchannel hole 14, thereby improving the flow distribution uniformity of each microchannel hole in the microchannel flat tube.

[0048] To form the aforementioned constricted section 123, in some embodiments, the constricted section 123 may include an end interface section 12 and a transition section 13 connected in sequence. The constricted section 123 is integrally formed at the end of the microchannel flat tube body 5 through the end of the transition section 13 facing away from the end interface section 12. The inner hole of the end interface section 12 forms the aforementioned port 121, and the inner hole of the transition section 13 forms the aforementioned flow-diverting cavity 131. The transition section 13 gradually thickens from the end interface section 12 towards the microchannel flat tube body 5, and the inner hole of the transition section 13 gradually expands outward from the end interface section 12 towards the microchannel flat tube body 5.

[0049] In the example above, by designing a gradually expanding transition section 13, the overall structural strength of the constricted section 123 can be improved and stress concentration reduced.

[0050] Both the aforementioned end interface section 12 and the transition section 13 can be formed simultaneously using a necking mold. The transition section 13, serving as a transition between the end interface section 12 and the microchannel flat tube body 5, facilitates the shaping of the end interface section 12 using the necking mold. Furthermore, the gradually expanding shape of the transition section 13 can disrupt the boundary layer, preventing flow concentration in the middle of the necked section 123 and reducing flow near the tube wall. Additionally, the inner diameter of the transition section 13 can also act as a buffer for mixing.

[0051] The transition section 13 also serves as a limiting element, preventing inconsistent insertion depths into the manifold and improving assembly efficiency. Furthermore, the refrigerant is diverted within the manifold and enters the inner hole of the transition section 13 through the end interface section 12. This inner hole acts as the aforementioned diversion cavity 131, performing a secondary diversion before being distributed to the microchannel holes 14 of the microchannel flat tube body 5, thus improving the uniformity of the diversion within the microchannel holes 14.

[0052] In some implementations, such as Figure 1-2 As shown, the inner hole of the aforementioned end interface section 12 is a single channel. This single channel means that there is no partition structure inside the end interface section 12, which reduces the shrinking resistance of the shrinking section 123 during shrinking and forming, thereby reducing the shrinking difficulty of the shrinking section 123.

[0053] In some embodiments, the inner hole of the aforementioned gradient section 13 is a single channel. This single channel means that there is no partition structure inside the gradient section 13, which further reduces the shrinking resistance of the shrinking section 123 during shrinking, thereby further reducing the shrinking difficulty of the shrinking section 123.

[0054] Neither the aforementioned end interface section 12 nor the gradient section 13 contains microchannel holes 14; both are single large-diameter channels. This design simplifies the necking mold structure, increases the necking efficiency of the microchannel flat tube, and reduces the scrap rate.

[0055] In the process of processing the microchannel flat tube of this utility model, a section without microchannel holes 14 can be reserved at both ends of the microchannel flat tube before the necking, forming a single channel. The necking section 123 mentioned above can be formed by necking the part without microchannel holes 14. The necking mold is simple and the necking difficulty is low, which increases the necking efficiency of the microchannel flat tube and reduces the scrap rate.

[0056] In some embodiments, both ends of the aforementioned microchannel flat tube body 5 are provided with the aforementioned constricted section 123 to facilitate limiting the depth of insertion of the microchannel flat tube into the corresponding manifold at both ends.

[0057] In some embodiments, the aforementioned microchannel flat tube may also be provided with heat dissipation fins 6, which play a role in enhancing heat exchange.

[0058] In some implementations, such as Figure 4 As shown, this utility model also provides a microchannel heat exchanger, which includes a manifold and a microchannel flat tube as described above. The manifold is provided with an interface 11 communicating with an internal tube hole. The microchannel flat tube is inserted into the interface 11 through a constriction section 123, so as to communicate with the tube hole of the manifold through the port 121 of the constriction section. There are two manifolds, namely a first manifold 3 and a second manifold 4. The first manifold 3 is connected to one end of the microchannel flat tube, and the second manifold 4 is connected to the other end of the microchannel flat tube.

[0059] In the above example, by designing a constriction section 123 at the end of the microchannel flat tube, it is beneficial to limit the depth of the microchannel flat tube inserted into the manifold, thus avoiding the problem of inconsistent insertion depth in the manifold when the microchannel flat tube is manually installed.

[0060] In some embodiments, the aforementioned microchannel heat exchanger may further include a limiting structure for limiting the depth of the constricted section 123 inserted into the interface 11, so as to prevent the constricted section 123 from being inserted into the tube hole of the manifold.

[0061] In the above example, the limiting structure can work with the narrowing section 123 to limit the insertion depth, avoid the problem of inconsistent insertion depth, and improve assembly efficiency.

[0062] To achieve the function of the aforementioned limiting structure, in some embodiments, such as Figure 5-8 As shown, when the constricted section 123 includes an end interface section 12 and a gradient section connected in sequence, and the constricted section 123 is integrally formed at the end of the microchannel flat tube body through the end of the gradient section opposite to the end interface section 12, the inner hole of the end interface section 12 forms the port, and the inner hole of the gradient section 13 forms the flow-diverting cavity; the gradient section 13 gradually becomes thicker from the end interface section 12 towards the microchannel flat tube body 5, and the inner hole of the gradient section 13 gradually expands outward from the end interface section 12 towards the microchannel flat tube body 5, the limiting structure may include a flared section 9 disposed at the interface 11, and the flared section 9 may be integrally formed at the interface 11. The limiting structure limits the depth of the constricted section 123 inserted into the interface 11 by the inner wall of the flared section 9 abutting against the outer wall of the gradient section 13, thereby realizing the function of the aforementioned limiting structure.

[0063] The aforementioned flared section 9 can be a bell mouth. The flared section 9 facilitates the insertion of the microchannel flat tube, improving assembly efficiency. The flared section 9, in conjunction with the aforementioned tapered section 13, forms a limiting mechanism, preventing inconsistent insertion depths during manual insertion. Furthermore, after the microchannel flat tube is inserted into the flared section 9, a gap exists between the tail of the flared section 9 and the tapered section 13, allowing some solder to flow into this gap, improving brazing reliability. Additionally, the inner wall of the flared section 9 and the outer wall of the tapered section 13 form a sealed fit at the contact point, preventing solder from leaking into the system during welding.

[0064] In some implementations, such as Figure 11 As shown, a protruding connecting section 10 may be provided on the outer wall of the aforementioned manifold, and the connecting section 10 may be integrally formed on the outer wall of the manifold. The aforementioned interface 11 extends from the end of the connecting section 10 into the interior of the manifold. The aforementioned flared section 9 is provided at the end of the connecting section 10 opposite to the manifold. The length of the end interface section 12 is L3, the length of the connecting section 10 is L2, the wall thickness of the manifold is L1, the length of the transition section 13 is L5, and the length of the flared section 9 is L4. Wherein, L3 = L1 + L2, and L5 = L4.

[0065] In the example above, the parameter design ensures that the microchannel flat tube will not be inserted into the manifold, reducing interference with the refrigerant flow in the manifold and lowering the flow resistance in the manifold.

[0066] In some embodiments, the aforementioned microchannel heat exchanger further includes a first set of microchannel flat tubes and a second set of microchannel flat tubes. Both the first set of microchannel flat tubes and the second set of microchannel flat tubes are composed of the aforementioned microchannel flat tubes. For example... Figure 5-6 As shown, the first manifold 3 has a first cavity 31 and a second cavity 32 separated by partitions. The first cavity 31 is used to communicate with a first group of microchannel flat tubes, and the second cavity 32 is used to communicate with a second group of microchannel flat tubes. Wherein, as... Figure 4 As shown, the microchannel heat exchanger also includes a first diverter 1, which has a refrigerant A inlet 101, a first refrigerant A outlet 102, and a second refrigerant A outlet 103 connected to each other. The first diverter 1 is connected to the first cavity 31 through the first refrigerant A outlet 102 and to the second cavity 32 through the second refrigerant A outlet 103.

[0067] In the above example, the first group of microchannel flat tubes and the second group of microchannel flat tubes are arranged in parallel. Furthermore, the first diverter 1 facilitates the connection of external refrigerant to both groups through the same interface 11. The first diverter 1 improves the uniformity of gaseous refrigerant flow into the flat tubes during cooling. During cooling, the gaseous refrigerant enters through the first diverter 1, condenses, and exits as a liquid or two-phase medium through the second diverter 2.

[0068] In some implementations, such as Figure 6 As shown, the first cavity 31 is provided with a first interface 311 that communicates with the first A refrigerant outlet 102, and the second cavity 32 is provided with a second interface 321 that communicates with the second A refrigerant outlet 103.

[0069] In some embodiments, the aforementioned microchannel heat exchanger may include a third group of microchannel flat tubes and a fourth group of microchannel flat tubes, both of which are composed of the aforementioned microchannel flat tubes. For example... Figure 5 As shown, the first manifold 3 has a third cavity 33 and a fourth cavity 34 separated from each other. The third cavity 33 is used to communicate with the third group of microchannel flat tubes, and the fourth cavity 34 is used to communicate with the fourth group of microchannel flat tubes. Wherein, as... Figure 4 As shown, the microchannel heat exchanger also includes a second diverter 2, which has a first B refrigerant inlet 202, a second B refrigerant inlet 203, and a B refrigerant outlet 201 that are connected to each other. The second diverter 2 is connected to the third cavity 33 through the first B refrigerant inlet 202 and to the fourth cavity 34 through the second B refrigerant inlet 203.

[0070] In the above example, the third and fourth groups of microchannel flat tubes are arranged in parallel. Furthermore, the second diverter 2 facilitates the discharge of refrigerant from both groups through the same interface 11, ensuring uniform refrigerant discharge. The second diverter 2 improves the uniformity of the two-phase refrigerant flow into the flat tubes during heating. During heating, the two-phase refrigerant enters through the second diverter 2, evaporates into a gaseous state, or exits through the first diverter 1.

[0071] In some implementations, such as Figure 5-6 As shown, the aforementioned third cavity 33 is provided with a third interface 331 that communicates with the first B refrigerant inlet 202, and the fourth cavity 34 is provided with a fourth interface 332 that communicates with the second B refrigerant inlet 203.

[0072] In some implementations, such as Figure 5 As shown, the aforementioned first manifold 3 and / or second manifold 4 are provided with a connecting cavity 15 for two adjacent sets of microchannel flat tubes connected in series. Specifically, the two sets of microchannel flat tubes connected in series through the connecting cavity 15 are designated as the first A group of microchannel flat tubes and the second A group of microchannel flat tubes. The connecting cavity 15 is divided into a first chamber 151 and a second chamber 152 by the spray plate 7. The connecting cavity 15 is connected to the first A group of microchannel flat tubes through the first chamber 151 and to the second A group of microchannel flat tubes through the second chamber 152. As shown... Figure 8As shown, the spray plate 7 is provided with large-diameter spray holes 71 and small-diameter spray holes 72. There are two or more small-diameter spray holes 72, which are arranged sequentially along the circumference of the large-diameter spray holes 71.

[0073] In the example above, the pressure drop of the large-diameter jet orifice 71 is small, but the ejected fluid velocity is slow; the pressure drop of the small-diameter jet orifice 72 is large, and the ejected fluid velocity is fast. If all the jet orifices were small-diameter 72, the pressure drop would be very large; if only the large-diameter jet orifice 71 were present, the flow velocity would be low, potentially resulting in poor flow uniformity. Furthermore, the fluid ejected from the small-diameter jet orifice 72 impacts and collides with the fluid ejected from the large-diameter jet orifice 71, which can disperse the fluid and improve flow uniformity.

[0074] By designing a greater number of small-diameter injection holes 72, on the one hand, the refrigerant can be ejected from multiple injection holes, which can increase the uniformity of fluid distribution in space; on the other hand, a greater number of small-diameter injection holes 72 can increase the impact and collision force of the fluid ejected from the small-diameter injection holes 72 on the fluid ejected from the large-diameter injection holes 71, which is beneficial to further disperse the fluid and improve the uniformity of flow distribution.

[0075] In a specific application example, the diameter of the large-diameter injection orifice 71 can be 4 mm, while the diameter of the small-diameter injection orifice 72 can be 2 mm. The refrigerant flow rate is increased by using the small-diameter injection orifice 72, and the uniformity of the flow distribution is improved by using multiple small-diameter injection orifices 72.

[0076] In some implementations, such as Figure 5-7 As shown, the first manifold 3 and the second manifold 4 are both equipped with baffles 8. Each baffle 8 cooperates with each spray plate 7 to allow the refrigerant to flow back and forth between the first manifold 3 and the second manifold 4 through different microchannel flat tubes, so that the refrigerant can form an S-shaped flow trajectory in the microchannel heat exchanger to complete the heat exchange.

[0077] In a specific application example, the refrigerant enters the first manifold 3 through the first splitter 1 via the first interface 311 and the second interface 321 on the upper side. In the first manifold 3, it is split and enters the microchannel flat tube. The baffle 8 controls the flow path, and the spray plate 7 increases the refrigerant flow rate through small-diameter spray holes 72, and improves the uniformity of the split through multiple small-diameter spray holes 72. When the microchannel heat exchanger is used as a condenser, the high-temperature, high-pressure refrigerant enters the first manifold 3 from the first splitter 1, flows through the flat tube to the second manifold 4, then flows back to the first manifold 3, then back to the second manifold 4, and finally flows back to the first manifold 3, exiting through the second splitter 2, completing the cycle. When the microchannel heat exchanger is used as an evaporator, the refrigerant flows in the reverse direction.

[0078] In some embodiments, the present invention also provides an air conditioner, which may include any of the microchannel flat tubes described above; or include any of the microchannel heat exchangers described above. Wherein, since a flow-dividing cavity 131 communicating with each microchannel hole 14 is formed inside the constricted section 123, refrigerant flows into the flow-dividing cavity 131 from the port. The flow-dividing cavity 131 can perform secondary flow-division of the refrigerant flowing into each microchannel hole 14, thus achieving a secondary flow-division effect, thereby improving the flow-division uniformity of each microchannel hole 14 within the microchannel flat tube.

[0079] For ease of understanding, the overall structure of this utility model will be described below, and its working principle will be explained.

[0080] This invention features a section at both ends of a microchannel flat tube without microchannel holes 14, forming a large-diameter single channel. This section is then narrowed. This design simplifies the narrowing mold, increases narrowing reliability, improves the narrowing efficiency of the microchannel flat tube, and reduces the scrap rate. A transition section 13 is incorporated into the narrowed section 123. The inner hole of the transition section 13 forms a flow-dividing cavity, which provides secondary flow division, improving the uniformity of flow division among the different microchannel holes 14 within the microchannel flat tube. An flared section 9 is added to the manifold, working in conjunction with the transition section 13 of the microchannel flat tube to provide a limiting effect, preventing inconsistent insertion depths and improving assembly efficiency. The microchannel flat tube is not inserted into the manifold, reducing interference with the flow inside the manifold and lowering flow resistance. The use of components such as the first flow divider 1, the second flow divider 2, the baffle 8, and the spray plate 7 further enhances the uniformity of flow division within the manifold.

[0081] When the microchannel flat tube is used as a condenser, the refrigerant enters the first manifold 3 through the first distributor 1 for initial diversion, then enters the transition section 13 through the end interface section 12 of the microchannel flat tube, undergoes secondary diversion in the transition section 13, and after heat exchange through the microchannel flat tube body 5, enters the second manifold 4, then flows from the second manifold 4 back to the first manifold 3, then from the first manifold 3 back to the second manifold 4, and finally from the second manifold 4 back to the first manifold 3, flowing out through the second distributor 2 in a cycle. When the microchannel flat tube is used as an evaporator, the flow is reversed. The baffle 8 and the spray plate 7 control the flow path.

[0082] The technical solution of this invention solves the problem of uneven flow distribution among different microchannel holes 14 inside the microchannel flat tube by narrowing the ends of the microchannel flat tube, adding a flow-dividing cavity in the transition section 13, and adding a flared section 9 at the manifold. This reduces the difficulty of narrowing, improves the narrowing efficiency of the flat tube, and increases the assembly efficiency of the flat tube and the manifold while ensuring the consistency of the flat tube's position. Furthermore, by reserving a length at both ends of the microchannel flat tube without microchannel holes 14, creating a single channel, the narrowing mold is simple, the narrowing difficulty is low, increasing the narrowing efficiency of the microchannel flat tube and reducing the scrap rate. Additionally, the microchannel flat tube of this invention does not insert into the manifold, reducing interference with the flow inside the manifold and lowering the flow resistance in the manifold.

[0083] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0084] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A microchannel flat tube, characterized in that: It includes a microchannel flat tube body (5) and a constricted section (123) integrally formed at the end of the microchannel flat tube body (5), wherein the microchannel flat tube body (5) has two or more microchannel holes (14); The constricted section (123) has a flow divider cavity (131) that communicates with each of the microchannel holes (14), and the end of the constricted section (123) has a port (121) that communicates with the flow divider cavity (131).

2. The microchannel flat tube according to claim 1, characterized in that: The constricted section (123) includes an end interface section (12) and a transition section (13) connected in sequence. The constricted section (123) is integrally formed at the end of the microchannel flat tube body (5) through the end of the transition section (13) opposite to the end interface section (12). The inner hole of the end interface section (12) forms the port (121), and the inner hole of the transition section (13) forms the flow divider (131). The gradient section (13) gradually becomes thicker from the end interface section (12) toward the microchannel flat tube body (5), and the inner hole of the gradient section (13) gradually expands outward from the end interface section (12) toward the microchannel flat tube body (5).

3. The microchannel flat tube according to claim 2, characterized in that: The inner hole of the end interface section (12) is a single channel; And / or, the inner hole of the gradient section (13) is a single channel.

4. The microchannel flat tube according to any one of claims 1-3, characterized in that: Both ends of the microchannel flat tube body (5) are provided with the aforementioned constricted sections (123).

5. A microchannel heat exchanger, characterized in that: The device includes a manifold and a microchannel flat tube as described in any one of claims 1-4; the manifold is provided with an interface (11) that communicates with an internal tube hole; the microchannel flat tube is inserted into the interface (11) through the constricted section (123) to communicate with the tube hole of the manifold through the port (121) of the constricted section (123); The number of manifolds is two, namely a first manifold (3) and a second manifold (4). The first manifold (3) is connected to one end of the microchannel flat tube, and the second manifold (4) is connected to the other end of the microchannel flat tube.

6. The microchannel heat exchanger according to claim 5, characterized in that: The microchannel heat exchanger also includes a limiting structure, which is used to limit the depth of the constricted section (123) inserted into the interface (11) to prevent the constricted section (123) from being inserted into the hole of the manifold.

7. The microchannel heat exchanger according to claim 6, characterized in that: When the constricted section (123) includes an end interface section (12) and a transition section (13) connected in sequence, and the constricted section (123) is integrally formed at the end of the microchannel flat tube body (5) through the end of the transition section (13) opposite to the end interface section (12), the inner hole of the end interface section (12) forms the port (121), and the inner hole of the transition section (13) forms the flow divider (131); the transition section (13) gradually becomes thicker from the end interface section (12) toward the microchannel flat tube body (5), and the inner hole of the transition section (13) gradually expands outward from the end interface section (12) toward the microchannel flat tube body (5), The limiting structure includes a flared section (9) disposed at the interface (11). The limiting structure abuts against the outer wall of the gradient section (13) through the inner wall of the flared section (9) to limit the depth of the constricted section (123) inserted into the interface (11).

8. The microchannel heat exchanger according to claim 7, characterized in that: The outer wall of the manifold is provided with a protruding connecting section (10), and the interface (11) extends from the end of the connecting section (10) into the interior of the manifold; the flared section (9) is provided at the end of the connecting section (10) away from the manifold, wherein the length of the end interface section (12) is L3, the length of the connecting section (10) is L2, the wall thickness of the manifold is L1, the length of the transition section (13) is L5, and the length of the flared section (9) is L4; wherein, L3 = L1 + L2, and L5 = L4.

9. The microchannel heat exchanger according to any one of claims 5-8, characterized in that: It includes a first group of microchannel flat tubes and a second group of microchannel flat tubes, both of which are composed of the aforementioned microchannel flat tubes; the first manifold (3) has a first cavity (31) and a second cavity (32) separated from each other, the first cavity (31) being used to communicate with the first group of microchannel flat tubes, and the second cavity (32) being used to communicate with the second group of microchannel flat tubes; The microchannel heat exchanger further includes a first diverter (1), which has a refrigerant inlet (101), a first refrigerant outlet (102), and a second refrigerant outlet (103) connected to each other. The first diverter (1) is connected to the first cavity (31) through the first refrigerant outlet (102) and to the second cavity (32) through the second refrigerant outlet (103).

10. The microchannel heat exchanger according to any one of claims 5-8, characterized in that: It includes a third group of microchannel flat tubes and a fourth group of microchannel flat tubes, both of which are composed of the aforementioned microchannel flat tubes; the first manifold (3) has a third cavity (33) and a fourth cavity (34) separated from each other, the third cavity (33) being used to communicate with the third group of microchannel flat tubes, and the fourth cavity (34) being used to communicate with the fourth group of microchannel flat tubes; The microchannel heat exchanger further includes a second diverter (2), which has a first B refrigerant inlet (202), a second B refrigerant inlet (203), and a B refrigerant outlet (201) connected in series. The second diverter (2) is connected to the third cavity (33) through the first B refrigerant inlet (202) and to the fourth cavity (34) through the second B refrigerant inlet (203).

11. The microchannel heat exchanger according to any one of claims 5-8, characterized in that: The first manifold (3) and / or the second manifold (4) are provided with a connecting cavity (15) for two adjacent sets of microchannel flat tubes connected in series. The two sets of microchannel flat tubes connected in series through the connecting cavity (15) are respectively the first A group of channel flat tubes and the second A group of microchannel flat tubes. The connecting cavity (15) is divided into a first chamber (151) and a second chamber (152) by a spray plate (7). The connecting cavity (15) is connected to the first A group of microchannel flat tubes through the first chamber (151) and to the second A group of microchannel flat tubes through the second chamber (152). The spray plate (7) is provided with large-diameter spray holes (71) and small-diameter spray holes (72); the number of small-diameter spray holes (72) is two or more, and they are arranged sequentially along the circumference of the large-diameter spray holes (71).

12. The microchannel heat exchanger according to claim 11, characterized in that: Both the first manifold (3) and the second manifold (4) are equipped with baffles (8), and each baffle (8) cooperates with each spray plate (7) to make the refrigerant flow back and forth between the first manifold (3) and the second manifold (4) through different microchannel flat tubes.

13. An air conditioner, characterized in that: It includes the microchannel flat tube according to any one of claims 1-4; or it includes the microchannel heat exchanger according to any one of claims 5-12.

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