Air conditioner

Abstract

The utility model discloses an air conditioner, and belongs to the technical field of air treatment. The air conditioner comprises a heat exchanger; the heat exchanger comprises a plurality of flat pipes arranged in the height direction; the collecting pipe is used for distributing refrigerants to the flat pipes, the collecting pipe comprises an arc side wall and a plate side wall which are oppositely arranged, the plate side wall is connected with the flat pipes, and the collecting pipe is provided with a refrigerant inlet formed in the arc side wall and a refrigerant outlet formed in the plate side wall; the mixing cavity is communicated with the refrigerant inlet; the shunting cavity is positioned on the upper side of the mixing cavity and is communicated with the flat pipe; the flow dividing cavity is communicated with the mixing cavity through the spraying hole; the inner wall surface, defining the mixing cavity, on the plate side wall is provided with an arc-shaped wall surface; when the heat exchanger is used as an evaporator, the collecting pipe enables refrigerants to collide towards the arc-shaped wall face from the refrigerant inlet through the mixing cavity to be dispersed, the refrigerants continue to be converged and then are sprayed out towards the flow dividing cavity through the spraying holes, and the refrigerants in the flow dividing cavity are divided to flow to the flat pipes. The air conditioner can solve the problem of poor refrigerant distribution uniformity of the micro-channel heat exchanger.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air treatment, in particular to an air conditioner. BACKGROUND

[0002] The heat exchanger is an important component of the heat exchange cycle of the air conditioner. The commonly used heat exchanger forms include the tube-fin type and the micro-channel type. The tube-fin type heat exchanger includes a plurality of fins and a circular tube penetrating the fins. The micro-channel type heat exchanger includes a plurality of flat tubes and a plurality of fins connected to the flat tubes. In the tube-fin type heat exchanger and the micro-channel type heat exchanger, the refrigerant flowing through the circular tube or the flat tube exchanges heat with the external air. The fins can increase the heat exchange area between the refrigerant in the circular tube or the flat tube and the external air.

[0003] Since the height of the heat exchanger of the large outdoor unit is large, the number of flat tubes in the vertical direction is large. Whether the refrigerant can be uniformly distributed into these flat tubes becomes a bottleneck problem that restricts the performance of the micro-channel type heat exchanger. CONTENT OF THE INVENTION

[0004] The present application provides an air conditioner, which can solve the problem of poor refrigerant distribution uniformity of the micro-channel heat exchanger.

[0005] In one aspect of the present application, an air conditioner includes a heat exchanger. The heat exchanger includes a plurality of flat tubes arranged in a height direction for flowing refrigerant, and a header for distributing the refrigerant to the plurality of flat tubes. The header includes oppositely arranged arc side walls and plate side walls, and the plate side walls are connected to the flat tubes. The header is provided with a refrigerant inlet on the arc side wall, a mixing chamber communicating with the refrigerant inlet, a distribution chamber located on the upper side of the mixing chamber and communicating with the flat tubes, and a jet hole communicating the distribution chamber and the mixing chamber. The inner wall surface of the mixing chamber formed by the plate side walls has an arc-shaped wall surface, and the arc line direction of the arc-shaped wall surface is transverse.

[0006] When the heat exchanger is used as an evaporator, the header causes the refrigerant to be dispersed by the refrigerant inlet impacting the arc-shaped wall surface in the mixing chamber, and then to be sprayed to the distribution chamber through the jet hole after further converging, and then to be distributed to the flat tubes.

[0007] In this technical solution, when the heat exchanger is used as an evaporator, the two-phase refrigerant flows into the mixing chamber of the header from the refrigerant inlet, and then impacts the arc-shaped wall surface to be distributed to both sides. The refrigerant continues to collide with the arc-shaped wall surface and the arc side wall to circulate, so that the refrigerant can be mixed in the mixing chamber. The mixed refrigerant can be vertically sprayed to the top through the jet hole, thereby promoting the uniform distribution of the header to the flat tubes.

[0008] In some embodiments, a plane parallel to the height direction and passing through the axis of the refrigerant inlet is defined as a reference plane P, and the mixing chamber is symmetrical relative to the reference plane P.

[0009] In the technical solution, the mixing cavity is symmetrical to the reference surface P, which can ensure that the spaces of the refrigerants on both sides are the same and the mixing of the refrigerants on both sides is uniform.

[0010] In some embodiments, the axis of the injection hole is located on the reference surface P.

[0011] In some embodiments, the arc-shaped wall surface has one, and the arc-shaped wall surface is concave on the plate side wall in a direction away from the refrigerant inlet.

[0012] In the technical solution, the refrigerant hits the concave surface of the arc-shaped wall surface, which can promote the mixing of the refrigerant.

[0013] In some embodiments, the arc-shaped wall surface includes a first arc-shaped wall surface and a second arc-shaped wall surface, and the connection of the first arc-shaped wall surface and the second arc-shaped wall surface forms a protruding sharp part.

[0014] In the technical solution, the refrigerant flows to the arc-shaped wall surfaces on both sides after hitting the sharp part, and the arc-shaped wall surfaces can promote the mixing of the refrigerant.

[0015] In some embodiments, the angle α between the tangent line of the transverse ends of the arc-shaped wall surface and the adjacent inner wall surface is ≥90°.

[0016] In some embodiments, the header further comprises: a plurality of flat tube connection cavities arranged in the height direction, the flat tube connection cavities are arranged transversely to the distribution cavity and are located on the upper side of the mixing cavity, and the flat tube connection cavities are in communication with the flat tubes; and a plurality of distribution holes for connecting the distribution cavity and the flat tube connection cavities.

[0017] In the technical solution, the arrangement of the flat tube connection cavities can reduce the transverse width of the distribution cavity and avoid the speed reduction of the refrigerant injected into the distribution cavity.

[0018] Another aspect of the present application is an air conditioner, comprising: a heat exchanger; the heat exchanger comprises: a plurality of flat tubes arranged in the height direction for flowing refrigerant; a header for distributing refrigerant to the plurality of flat tubes, the header comprising:

[0019] a pipe body having a circular arc side wall with a refrigerant inlet; a plate side wall arranged opposite to the circular arc side wall, and the plate side wall is connected with the flat tube;

[0020] a first partition part for separating the space in the pipe body into a mixing cavity and a distribution cavity, the mixing cavity is located on the lower side of the distribution cavity and is in communication with the refrigerant inlet, the distribution cavity is in communication with the flat tube, and the first partition part is provided with an injection hole for connecting the mixing cavity and the distribution cavity;

[0021] The inner wall surface of the plate side wall surrounding the mixing cavity has an arc-shaped wall surface, and the arc line direction of the arc-shaped wall surface is transverse.

[0022] The header pipe is used for dispersing the refrigerant by impacting the arc-shaped wall surface from the refrigerant inlet through the mixing cavity, and then spraying the refrigerant to the branch cavity through the spray hole after the refrigerant is converged, and then the refrigerant flows to the flat tube.

[0023] In some embodiments, the pipe body comprises: a first pipe body, which has an arc-shaped side wall; and a second pipe body, which is spliced with the first pipe body and has a plate-shaped side wall, and the second pipe body and the first pipe body enclose the mixing cavity and the branch cavity.

[0024] In the technical solution, the split structure of the pipe body facilitates the processing of the internal cavity structure of the pipe body.

[0025] In some embodiments, the second pipe body is provided with two opposite limiting portions, and the transverse end of the arc-shaped side wall abuts against the limiting portions.

[0026] In the technical solution, the limiting portions are provided to limit the connection of the first pipe body and the second pipe body, thereby facilitating the connection of the two. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A schematic diagram of a refrigerant circulation loop of an air conditioner according to some embodiments is shown;

[0028] Figure 2 A perspective view of a heat exchanger in an air conditioner according to some embodiments is shown;

[0029] Figure 3 A perspective view of a header pipe in an air conditioner according to some embodiments is shown;

[0030] Figure 4 A sectional view of the header pipe in an air conditioner according to some embodiments is shown;

[0031] Figure 5 A sectional view of the header pipe and the flat tube in an air conditioner according to some embodiments is shown;

[0032] Figure 6 A schematic diagram of a flow path of the refrigerant in the mixing cavity of the header pipe in an air conditioner according to some embodiments is shown;

[0033] Figures 7-9 A simulation diagram of the refrigerant in the header pipe in an air conditioner according to some embodiments is shown;

[0034] Figure 10 A sectional view of the header pipe showing the mixing cavity in an air conditioner according to some other embodiments is shown;

[0035] Figure 11 A simulation diagram of the refrigerant in the header pipe in an air conditioner according to some other embodiments is shown;

[0036] Figure 12A cross-sectional view of a flow collecting pipe display mixing cavity in an air conditioner according to still other embodiments is shown.

[0037] Figure 13 A perspective view of a first pipe body in an air conditioner according to other embodiments is shown.

[0038] Figure 14 A perspective view of a first pipe body in an air conditioner according to other embodiments is shown.

[0039] In the above figures, 100, outdoor unit; 111, compressor; 112, four-way valve; 113, outdoor heat exchanger; 114, outdoor throttling device; 115, outdoor fan; 120, housing; 121, air inlet; 122, air outlet; 130, flow divider; 131, capillary tube; 200, indoor unit; 210, indoor heat exchanger; 211, indoor fan; 220, indoor throttling device; 300, heat exchanger; 310, flat tube; 310a, hole; 320, fin; 330, flow collecting pipe; 330a, refrigerant inlet; 331, first pipe body; 3311, circular arc side wall; 3312, top wall; 3313, bottom wall; 3314, first partition portion; 332, second pipe body; 3321, plate side wall; 3322, arc-shaped wall surface; 3323, first arc-shaped wall surface; 3324, second arc-shaped wall surface; 3325, pointed portion; 3326, second partition portion; 3327, limiting portion; 3328, insertion slot; 333, first partition portion; 3331, injection hole; 334, mixing cavity; 335, second partition portion; 3351, flow dividing hole; 336, flow dividing cavity; 338, third partition portion; 339, flat tube connecting cavity; 340, gas collecting pipe. DETAILED DESCRIPTION

[0040] For the purpose of making the purpose and implementation of the present application more clear, the exemplary implementation of the present application will be described clearly and completely below in combination with the drawings of the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0041] In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 present application.

[0042] The terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply any relative importance or imply a specific number of features so indicated. Thus, features defined with "first", "second" or "third" can include one or more of such features either explicitly or implicitly. In the description of the application, the meaning of "a", "an" and "the" is intended to be one or more unless otherwise indicated.

[0043] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0044] The embodiments of the application will be described in detail below with reference to the accompanying drawings:

[0045] Referring to Figure 1 According to the air conditioner of the embodiments of the application, the air conditioner comprises an outdoor unit 100 located in an outdoor space and configured to perform heat exchange between refrigerant and outdoor air, and an indoor unit 200 located in an indoor space and configured to perform heat exchange between refrigerant and indoor air.

[0046] The outdoor unit 100 is provided with a compressor 111 configured to compress refrigerant, a four-way valve 112 configured to guide the refrigerant compressed by the compressor to an outdoor heat exchanger 113 or an indoor heat exchanger 210, the outdoor heat exchanger 113 configured to condense the refrigerant introduced thereto in cooling and evaporate the refrigerant flowing thereto in heating, and an outdoor throttling device 114 configured to decompress the refrigerant introduced to the outdoor heat exchanger 113.

[0047] The indoor unit 200 is provided with an indoor heat exchanger 210 configured to evaporate the refrigerant flowing thereto in cooling and condense the refrigerant introduced thereto in heating, and an indoor throttling device 220 configured to decompress the refrigerant introduced to the indoor heat exchanger 210.

[0048] The compressor 111, the four-way valve 112, the outdoor heat exchanger 113, the outdoor throttling device 114, the indoor throttling device 220 and the indoor heat exchanger 210 are connected in sequence by refrigerant pipes to form a refrigerant circulation loop.

[0049] In the outdoor unit 100, the outdoor fan 115 is disposed opposite the outdoor heat exchanger 113. The outdoor fan 115 includes an outdoor fan and a motor that drives the outdoor fan to rotate. Rotation of the outdoor fan causes outdoor air to flow, and the outdoor air exchanges heat with refrigerant in the outdoor heat exchanger 113 as the outdoor air passes through the outdoor heat exchanger 113.

[0050] In the indoor unit 200, the indoor fan 211 is disposed opposite the indoor heat exchanger 210. The indoor fan 211 includes an indoor fan and a motor that drives the indoor fan to rotate. Rotation of the indoor fan causes indoor air to flow, and the indoor air exchanges heat with refrigerant in the indoor heat exchanger 210 as the indoor air passes through the indoor heat exchanger 210.

[0051] During cooling operation, the compressor 111 discharges high-temperature, high-pressure gas refrigerant, which flows into the outdoor heat exchanger 113 via the four-way valve 112. At the outdoor heat exchanger 113, the gas refrigerant is cooled by exchanging heat with outdoor air, and the refrigerant gradually changes from a gas state to a liquid state as it flows through the outdoor heat exchanger 113.

[0052] The liquid refrigerant that is discharged from the outdoor heat exchanger 113 is guided to the indoor unit 200 via the outdoor throttling device 114.

[0053] In the indoor unit 200, the refrigerant is decompressed by the indoor throttling device 220, and becomes a gas-liquid two-phase state.

[0054] The refrigerant that flows out of the indoor throttling device 220 is further guided to the indoor heat exchanger 210, and evaporates by exchanging heat with indoor air that is driven by the indoor fan 211. The temperature of the indoor air decreases and is blown into the room. The refrigerant changes from a gas-liquid two-phase state to a gas state in the indoor heat exchanger 210.

[0055] The gas refrigerant that is discharged from the indoor heat exchanger 210 returns to the compressor 111, thereby forming a cooling cycle.

[0056] During heating operation, the four-way valve 112 is reversed. The compressor 111 discharges high-temperature, high-pressure gas refrigerant, which flows into the indoor heat exchanger 210 via the four-way valve 112. At the indoor heat exchanger 210, the gas refrigerant is heated by exchanging heat with indoor air, and the temperature of the indoor air increases and is blown into the room. The refrigerant gradually changes from a gas state to a liquid state as it flows through the indoor heat exchanger 210.

[0057] The liquid refrigerant that is discharged from the indoor heat exchanger 210 flows to the outdoor unit 100 via the indoor throttling device 220.

[0058] In the outdoor unit 100, the refrigerant is decompressed by the outdoor throttling device 114, and becomes a gas-liquid two-phase state.

[0059] The refrigerant flowing out of the outdoor throttling device 114 is continuously guided to the outdoor heat exchanger 113, and evaporated by heat exchange with outdoor air driven by the outdoor fan 115. The refrigerant is changed from a gas-liquid two-phase state to a gas state in the outdoor heat exchanger 113.

[0060] The gas refrigerant from the outdoor heat exchanger 113 is returned to the compressor 111, thereby forming a heating cycle.

[0061] Figure 1 The above description is made with reference to a multi-split air conditioner, but the present application is also applicable to an air conditioner having only one indoor unit.

[0062] In the present application, the outdoor heat exchanger 113 and the indoor heat exchanger 210 are collectively referred to as a heat exchanger. The outdoor fan 115 and the indoor fan 211 are collectively referred to as a fan. The outdoor throttling device 114 and the indoor throttling device 220 are collectively referred to as a throttling device.

[0063] Referring to Figure 2 The heat exchanger 300 includes a refrigerant tube through which a refrigerant flows, and a fin 320 coupled to the refrigerant tube so as to increase a heat exchange area.

[0064] In some embodiments, the heat exchanger 300 can be a micro-channel heat exchanger, and the refrigerant tube is a flat tube 310. The fin 320 is connected to the flat tube 310, and increases a heat exchange efficiency between the refrigerant and air by increasing a surface area of the flat tube 310.

[0065] The flat tube 310 extends in a horizontal direction. A plurality of flat tubes 310 are arranged in a vertical direction (height direction) at intervals. The flat tube 310 can be an aluminum tube.

[0066] The fin 320 is in a sheet shape, and a plurality of fins 320 are arranged in a predetermined micro gap and are inserted into the flat tube 310.

[0067] In other embodiments, the fin 320 is connected in a corrugated shape between the flat tubes 310.

[0068] The flat tube 310 is a multi-hole tube having a plurality of holes forming a refrigerant flow path. The refrigerant exchanges heat with air while flowing through each hole of the flat tube 310. The plurality of holes are arranged in the flat tube 310 in a direction in which air flows with respect to the heat exchanger 300.

[0069] The heat exchanger 300 includes a header 330. The header 330 is connected to one end of the flat tube 310 in a transverse direction.

[0070] The header 330 extends in an up-down direction or a vertical direction by a predetermined length. The header 330 is provided at a side of the heat exchanger 300 to which the throttling device is connected, and through which a gas-liquid two-phase refrigerant flows.

[0071] The heat exchanger 300 includes a gas header 340. The gas header 340 and the flow header 330 are connected at both ends of the transverse direction of the flat tube 310.

[0072] The gas header 340 extends in the vertical direction for a predetermined length. The gas header 340 is provided at a side of the heat exchanger 300 connected to the four-way valve 112, and gas refrigerant flows therethrough.

[0073] When the heat exchanger 300 functions as an evaporator, a gas-liquid two-phase refrigerant flows into the flow header 330 and is branched to the plurality of flat tubes 310, and the refrigerant flowing in the plurality of flat tubes 310 continues to flow out of the heat exchanger 300 through the gas header 340.

[0074] When the heat exchanger 300 functions as a condenser, a gas refrigerant flows into the gas header 340 and is branched to the plurality of flat tubes 310, and the refrigerant flowing in the plurality of flat tubes 310 continues to flow out of the heat exchanger 300 through the flow header 330.

[0075] In some embodiments, referring to Figure 1 , the outdoor unit 100 can include a flow divider 130. The flow divider 130 can have a shower head shape. The plurality of capillary tubes 131 of the flow divider 130 are connected to the flow header 330. The flow divider 130 mainly functions as a primary flow divider here.

[0076] When the height of the heat exchanger 300 is large, for example, when the height of the heat exchanger 300 is greater than 1 m, the flow header 330 needs to function as a secondary flow divider in the case of uneven wind fields.

[0077] Hereinafter, a description is made of the flow of the refrigerant when the heat exchanger 300 functions as an evaporator.

[0078] In some embodiments, referring to Figures 3-5 , a flow space for the refrigerant is defined in the flow header 330.

[0079] The flow header 330 is provided with a refrigerant inlet 330a. The refrigerant inlet 330a can be connected to the capillary tube 131, and is used to flow the refrigerant into the flow header 330.

[0080] The flow header 330 is provided with a mixing chamber 334. The mixing chamber 334 is in communication with the refrigerant inlet 330a.

[0081] The flow header 330 is provided with a flow dividing chamber 336. The flow dividing chamber 336 is located at the upper side of the mixing chamber 334. The flow dividing chamber 336 is disposed above the mixing chamber 334. The flow dividing chamber 336 is in communication with the flat tube 310.

[0082] The manifold 330 is provided with a jet hole 3331. The jet hole 3331 connects the mixing chamber 334 and the distribution chamber 336, so that when the heat exchanger 300 is used as an evaporator, the refrigerant can be jetted from the mixing chamber 334 to the top of the distribution chamber 336 through the jet hole 3331, thereby ensuring that the refrigerant can continue to flow to each flat tube 310.

[0083] In some embodiments, the manifold 330 is arched. The manifold 330 includes oppositely arranged arc side walls 3311 and plate side walls 3321.

[0084] The refrigerant inlet 330a is arranged on the arc side wall 3311. The flat tube 310 is connected to the plate side wall 3321.

[0085] Referring to Figure 6 , the arrows in the figure show the refrigerant flow path. After entering the mixing chamber 334, the refrigerant first impacts the plate side wall 3321. When the inner wall surface of the plate side wall 3321 is a plane, the refrigerant is dispersed and rotated after impacting the inner wall surface, and converges at the jet hole 3331 and is jetted out to the distribution chamber 336. However, under actual working conditions, the refrigerant entering the manifold is not uniformly distributed in an ideal state. This unstable state causes the refrigerant to be biased to one side after impacting the wall surface, as shown in the simulation results. This flow deviation phenomenon causes the refrigerant to be unable to reach the top of the manifold, the refrigerant at the top is reduced, and the flow of the refrigerant in some flat tubes is obviously increased. Figures 7-9

[0086] Therefore, in some embodiments, referring to Figures 10-12 , the inner wall surface of the plate side wall 3321 surrounding the mixing chamber 334 is provided with an arc-shaped wall surface 3322.

[0087] The refrigerant entering the mixing chamber 334 is divided into two parts by the arc-shaped wall surface 3322. The dispersed refrigerant collides and mixes multiple times on the inner wall surfaces of the arc-shaped wall surface 3322 and the arc side wall 3311, so that the refrigerant converges before the jet hole 3331 and is vertically jetted to the distribution chamber 336, thereby solving the problem of less refrigerant at the top of the distribution chamber 336 and large refrigerant flow in some flat tubes 310 caused by flow deviation.

[0088] Figure 11 is a simulation diagram of the refrigerant in the manifold 330 after the inner wall surface of the plate side wall 3321 surrounding the mixing chamber 334 is provided with the arc-shaped wall surface 3322. As can be seen from the figure, the refrigerant can be mixed in the mixing chamber 334 and jetted vertically from the jet hole 3331, avoiding flow deviation and promoting uniform distribution of the manifold 330.

[0089] The present application ensures uniform distribution of the manifold 330 to the flat tubes 310 by setting the shape of the mixing chamber.

[0090] ​In some embodiments, a plane passing through the axis of the refrigerant inlet 330a and parallel to the height direction is a reference plane P. The arc-shaped wall surface 3322 is symmetrical relative to the reference plane P, so that the refrigerant can be dispersed as evenly as possible to both sides after hitting the arc-shaped wall surface 3322.

[0091] In some embodiments, the mixing cavity 334 is symmetrical relative to the reference plane P, so that the spaces on both sides of the reference plane P are identical, avoiding flow deviation caused by different sizes of the spaces on both sides.

[0092] In some embodiments, the center line of the arc-shaped wall surface 3322 extends vertically. The arc line of the arc-shaped wall surface 3322 extends vertically, so that the refrigerant is dispersed to both sides in the horizontal direction after hitting the arc-shaped wall surface 3322.

[0093] In some embodiments, referring to Figure 10 , the inner wall surface of the mixing cavity 334 formed on the plate side wall 3321 is an arc-shaped wall surface 3322.

[0094] In some embodiments, the arc-shaped wall surface 3322 is concave on the plate side wall 2231 in a direction away from the refrigerant inlet 330a.

[0095] In some embodiments, the chord height of the arc-shaped wall surface 3322 is smaller than the chord height of the inner wall surface of the circular arc side wall 3311. In this way, the size of the header 330 in the axis direction of the refrigerant inlet 330a can be reduced, so that the thickness of the header 330 in this direction is relatively small.

[0096] In some embodiments, the tangent line at the two ends of the arc-shaped wall surface 3322 forms an angle α with the adjacent inner wall surface, and the angle α is not less than 90°, so that the flow space of the refrigerant is not acute and is beneficial to the flow of the fluid.

[0097] The radius of the arc-shaped wall surface 3322 is greater than the radius of the inner wall surface of the circular arc side wall 3311. The larger radius of the arc-shaped wall surface 3322 makes the angle α formed by the two ends of the arc-shaped wall surface 3322 and the adjacent inner wall surface not too small.

[0098] In some embodiments, referring to Figure 12 , the inner wall surface of the mixing cavity 334 formed on the plate side wall 3321 includes two arc-shaped wall surfaces 3322. The two arc-shaped wall surfaces 3322 are a first arc-shaped wall surface 3323 and a second arc-shaped wall surface 3324, respectively.

[0099] The connection between the first arc-shaped wall surface 3323 and the second arc-shaped wall surface 3324 forms a sharp portion 3325. After hitting the sharp portion 3325, the refrigerant is dispersed to both sides of the arc-shaped wall surface 3322, and the dispersed refrigerant collides and mixes on the arc-shaped wall surface 3322 and the inner wall surface of the circular arc side wall 3311, so that the refrigerant converges in the mixing cavity 334 and then flows into the injection hole 3331.

[0100] In some embodiments, the first arc-shaped wall surface 3323 and the second arc-shaped wall surface 3324 are connected by a circular arc transition.

[0101] In some embodiments, on the cross section of the manifold 330 passing through the mixing chamber 334, the line connecting the ends of the first arc-shaped wall surface 3323 and the second arc-shaped wall surface 3324 away from each other is line m.

[0102] The portion of the first arc-shaped wall surface 3323 away from the second arc-shaped wall surface 3324 is close to line m. The portion of the second arc-shaped wall surface 3324 away from the first arc-shaped wall surface 3323 is close to line m. In this way, the angle a between the tangent of the end of the first arc-shaped wall surface 3323 and the adjacent wall surface, and the angle a between the tangent of the end of the second arc-shaped wall surface 3324 and the adjacent wall surface will not be too small, close to 90°, and the acute angle of the flow space of the refrigerant can be avoided.

[0103] In some embodiments, continuing to refer to Figure 4 and Figure 5 , the manifold 330 can include a tube body. The tube body forms the general appearance of the manifold 330.

[0104] The manifold 330 includes a first partition 333. The first partition 333 is arranged in the tube body.

[0105] The first partition 333 separates the internal space of the tube body into a mixing chamber 334 and a distribution chamber 336.

[0106] The first partition 333 is provided with a hole that penetrates up and down to form an injection hole 3331.

[0107] The injection hole 3331 is arranged close to the circular arc side wall 3311 and away from the plate side wall 3321, so that the refrigerant injected by the injection hole 331 is relatively far from the flat tube 310, avoiding the flat tube 310 being located on the injection path and affecting the injection effect.

[0108] The injection process can cause the two-phase state of the refrigerant to mix again, ensuring the uniformity of the refrigerant flowing into the flat tube 310.

[0109] In some embodiments, the manifold 330 includes a plurality of flat tube connection chambers 339 arranged in the height direction. The plurality of flat tube connection chambers 339 are arranged transversely to the distribution chamber 336, and the plurality of flat tube connection chambers 339 are located on the upper side of the mixing chamber 334.

[0110] Part of the mixing chamber 334 is located on the lower side of the distribution chamber 336, and another part of the mixing chamber 334 is located on the lower side of the flat tube connection chamber 339.

[0111] The upper middle part of the plate sidewall 3321 forms the sidewall that surrounds the flat tube connecting cavity 339. The lower part of the plate sidewall 3321 forms the sidewall that surrounds the mixing cavity 334.

[0112] The manifold 330 includes multiple branching holes 3351. Each branching hole 3351 corresponds to a flat tube connecting cavity 339. The branching holes 3351 connect the flat tube connecting cavity 339 and the branching cavity 336. The refrigerant in the branching cavity 336 flows to the flat tube connecting cavity 339 through the branching holes 3351.

[0113] The portion of the plate sidewall 3321 that forms the flat tube connection cavity 339 may be provided with multiple slots 3328 arranged along the height direction.

[0114] The flat tube 310 is inserted into the slot 3328 of the side wall 3321 of the plate. The flat tube 310 and the side wall 3321 of the plate can be fixed by welding.

[0115] The flat tube 310 is connected to the flat tube connecting cavity 339, so that the refrigerant in the flat tube connecting cavity 339 can flow to the flat tube 310.

[0116] The diversion hole 3351, the flat tube connecting cavity 339, and the flat tube 310 are set one-to-one.

[0117] The refrigerant in the split cavity 336 is split into multiple streams, which enter the flat tube connection cavity 339 through multiple split holes 3351, and then flow into the flat tube 310 from the flat tube connection cavity 339.

[0118] By providing flat tube connecting cavities 339 that correspond one-to-one with multiple distribution holes 3351, this application can ensure that the refrigerant evenly distributed to the distribution holes 3351 can all flow to the corresponding flat tubes 310, thereby ensuring the uniform distribution of refrigerant.

[0119] In some embodiments, the diversion orifice 3351 is arranged facing the inlet end of the flat tube 310, so that the refrigerant flowing out of the diversion orifice 3351 can flow to the flat tube 310 in a straight path.

[0120] The diversion hole 3351 and the flat tube 310 are located in the vertical middle of the flat tube flow cavity 339.

[0121] After the refrigerant enters the manifold 330 through the refrigerant inlet 330a, it is initially mixed in the mixing chamber 334, then injected into the distribution chamber 336 through the injection hole 3331 for secondary mixing, and then enters the flat tube connection chamber 339 through the distribution hole 3351, and finally flows into the flat tube 310.

[0122] In some embodiments, the manifold 330 includes a second partition 335. The second partition 335 is vertically disposed within the manifold body, separating the diversion chamber 336 from the plurality of flat tube connection chambers 339.

[0123] The second partition part 335 is provided with a plurality of flow distribution holes 3351 arranged in the height direction.

[0124] If the middle and upper part of the header pipe 330 is not provided with the second partition part 335 and the flat tube connecting cavity 339, and the flow distribution cavity 336 is directly communicated with the flat tube 310, in the case that the lateral dimension of the header pipe 330 is constant, the lateral dimension of the flow distribution cavity 336 will be relatively large, and the refrigerant in the flow distribution cavity 336 can be separated into liquid phase and gas phase.

[0125] However, in the embodiments of the present application, the middle and upper part of the header pipe 330 is divided into the flow distribution cavity 336 and the flat tube connecting cavity 339, so that the width of the flow path of the refrigerant can be limited to be relatively small, and the separation of the refrigerant in a large space can be avoided.

[0126] In some embodiments, the header pipe 330 comprises a plurality of third partition parts 338. The plurality of third partition parts 338 are arranged in the vertical direction to separate the plurality of flat tube connecting cavities 339.

[0127] The opposite ends of the third partition part 338 are connected to the second partition part 335 and the plate side wall 3321, respectively.

[0128] In some embodiments, referring to Figure 13 and Figure 14 , the pipe body comprises a first pipe body 331. The first pipe body 331 comprises a circular arc side wall 3311, and a top wall 3312 and a bottom wall 3313 connected to the upper and lower ends of the circular arc side wall 3311.

[0129] The header pipe 330 comprises a second pipe body 332. The second pipe body 332 is generally in the shape of a cuboid.

[0130] The second pipe body 332 is butted to the open end of the first pipe body 331, and the outer side wall of the second pipe body 332 opposite to the circular arc side wall 331 is a plate side wall 3321.

[0131] In some embodiments, in combination with Figure 4 , the first pipe body 331 is provided with a first partition part 3314 arranged in the lateral direction. The second pipe body 332 is provided with a second partition part 3326 arranged in the lateral direction. The first partition part 3314 and the second partition part 3326 are spliced to form a first partition part 333.

[0132] The injection hole 3331 is arranged on the first partition part 3314.

[0133] In some embodiments, the second partition part 335 is arranged on the side of the second pipe body 332 opposite to the plate side wall 3321. The bottom end of the second partition part 335 is connected to the second partition part 3326.

[0134] The third partition 338 is arranged in the second tube body 332.

[0135] In some embodiments, the two ends of the second partition 335 in the transverse direction are provided with limiting portions 3327. The limiting portions 3327 protrude towards the first tube body 331 relative to the second partition 335.

[0136] The open side end surface of the first tube body 331 abuts against the second partition 335. The two ends of the circular-arc side wall 3311 in the transverse direction abut against the limiting portions 3327, and are thus limited between the two limiting portions 3327.

[0137] The first tube body 331 and the second tube body 332 can be connected by welding.

[0138] As can be seen from the above, in the present application, when the heat exchanger 300 is used as an evaporator, two-phase refrigerant flows into the mixing chamber 334 of the header 330 from the refrigerant inlet 330a, is sprayed upwardly to the distribution chamber 336 via the spray hole 3331, and then flows from the distribution chamber 336 to the flat tubes 310. Due to the arrangement of the spray hole 3331, the refrigerant can be sprayed to the top of the header 330, so that each flat tube 310 can be distributed with refrigerant, and uniform distribution of the refrigerant is ensured.

[0139] In addition, by arranging the arc-shaped wall surface 3322 on the inner wall surface opposite to the refrigerant inlet 330a at the mixing chamber 334, the refrigerant can be mixed after impacting against the arc-shaped wall surface 3322, so that the refrigerant can be vertically sprayed to the top via the spray hole 3331, and deviation of the flow is avoided, and uniform distribution of the header 330 to the flat tubes 310 is promoted.

[0140] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some or all of the technical features; and such modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0141] For the convenience of explanation, the above description has been made in combination with specific embodiments. However, the above exemplary discussion is not intended to exhaust or limit the embodiments to the specific forms disclosed above. Various modifications and variations can be derived according to the above teachings. The selection and description of the above embodiments are for better explanation of the principles and practical applications, so that those skilled in the art can better use the embodiments and various different modified embodiments suitable for specific use considerations.

Claims

1. An air conditioner, characterized in that, The heat exchanger comprises: a plurality of flat tubes arranged along a height direction for flowing refrigerant; a header for distributing refrigerant to the plurality of flat tubes, the header comprising oppositely arranged arc side walls and plate side walls, the plate side walls being connected to the flat tubes, the header being provided with: a refrigerant inlet provided on the arc side wall; a mixing chamber in communication with the refrigerant inlet; a distribution chamber located on the upper side of the mixing chamber, the distribution chamber being in communication with the flat tubes; a jet hole for communicating the distribution chamber and the mixing chamber; wherein the inner wall surface of the plate side wall surrounding the mixing chamber has an arc-shaped wall surface, and the arc line of the arc-shaped wall surface extends in a transverse direction; when the heat exchanger is used as an evaporator, the header causes the refrigerant to be dispersed by being impacted on the arc-shaped wall surface from the refrigerant inlet through the mixing chamber, and then sprayed to the distribution chamber through the jet hole after further converging, and then distributed to the flat tubes. A plane parallel to the height direction and passing through the axis of the refrigerant inlet is defined as a reference plane P, and the mixing chamber is symmetrical to the reference plane P. The axis of the jet hole is located on the reference plane P.

2. The air conditioner of claim 1, wherein The tangent lines at the two ends of the arc-shaped wall surface in the transverse direction form an angle α with the adjacent inner wall surface, and α≥90°.

3. The air conditioner of claim 2, wherein The arc-shaped wall surface has one, and the arc-shaped wall surface is recessed on the plate side wall away from the refrigerant inlet.

4. The air conditioner of claim 1, wherein The arc-shaped wall surface comprises a first arc-shaped wall surface and a second arc-shaped wall surface, and the junction of the first arc-shaped wall surface and the second arc-shaped wall surface forms a protruding sharp part.

5. The air conditioner according to any one of claims 1 to 4, characterized by The header is further provided with:

6. The air conditioner according to any one of claims 1 to 4, wherein a plurality of flat tube connection chambers arranged along the height direction, the plurality of flat tube connection chambers being arranged transversely to the distribution chamber and located on the upper side of the mixing chamber, and the flat tube connection chambers being in communication with the flat tubes; 7. The air conditioner of claim 1, wherein a plurality of distribution holes for communicating the distribution chamber and the flat tube connection chambers. The heat exchanger comprises: a plurality of flat tubes arranged along a height direction for flowing refrigerant; 8. An air conditioner characterized by comprising: a header for distributing refrigerant to the plurality of flat tubes, the header comprising: a tube body having: an arc side wall provided with a refrigerant inlet; a plate side wall oppositely arranged to the arc side wall, the plate side wall being connected to the flat tubes; a first partition part for separating the space in the tube body into a mixing chamber and a distribution chamber, the mixing chamber being located on the lower side of the distribution chamber and being in communication with the refrigerant inlet, the distribution chamber being in communication with the flat tubes, and the first partition part being provided with: a jet hole for communicating the mixing chamber and the distribution chamber; wherein the inner wall surface of the plate side wall surrounding the mixing chamber has an arc-shaped wall surface, and the arc line of the arc-shaped wall surface extends in a transverse direction; when the heat exchanger is used as an evaporator, the header causes the refrigerant to be dispersed by being impacted on the arc-shaped wall surface from the refrigerant inlet through the mixing chamber, and then sprayed to the distribution chamber through the jet hole after further converging, and then distributed to the flat tubes. The tube body comprises: a first tube body having the arc side wall thereon; a second tube body connected to the first tube body, the second tube body having the plate side wall thereon, and the second tube body and the first tube body surrounding the mixing chamber and the distribution chamber. ​ 9. The air conditioner of claim 8, wherein ​ ​ ​ 10. The air conditioner of claim 9, wherein The second pipe body is provided with two opposite limiting parts, and the transverse end of the circular-arc side wall abuts against the limiting parts.

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