Cabinet air conditioner indoor unit

Abstract

The present invention provides a cabinet-type air conditioner indoor unit. It comprises: a shell, the lower part of the shell is provided with an air inlet, and the upper part is provided with an air supply port; a plurality of convection heat exchangers, which have an airflow gathering part and a convection heat exchange part, and are arranged in the shell; and the airflow gathering part is in the shape of a cylinder with openings at both ends and extending in the vertical direction; the convection heat exchange part is arranged on the inner side of the airflow gathering part, configured to generate heat or cold, and transfer the heat or cold to the air flowing through the inner side of the airflow gathering part; a plurality of airflow gathering parts are arranged coaxially in sequence along the vertical direction; and an air supply device, which is arranged in the shell, configured to at least cause the airflow to enter the inner side of the airflow gathering part from the air inlet, and after heat exchange with the convection heat exchange part, flow out from the air supply port. The airflow organization of the convection heat exchanger is optimized, the flow velocity is increased, and the energy efficiency of the air conditioner is improved.

Description

Technical Field

[0001] The invention relates to the field of refrigeration and heating, and in particular to a cabinet type air conditioner indoor unit. Background Art

[0002] In recent years, with the improvement of people's quality of life, more and more attention has been paid to the thermal comfort of indoor environment, and the energy consumption of buildings, especially cooling and heating energy consumption, has also increased. Therefore, efficient and energy-saving cooling and heating devices with good thermal comfort are one of the research hotspots in the HVAC industry. In the existing air-conditioning indoor units, finned tube evaporators are usually used. Finned tube evaporators are large in size and high in cost. The convective heat transfer coefficient of the air flow drawn by the fan is small, the airflow organization is poor, the production process is complicated, and the heat exchange performance of the existing finned tube evaporator can be improved. In addition, single evaporator air conditioners cannot reasonably allocate cooling capacity and can only eliminate sensible heat or latent heat alone. The energy consumption is high, and the indoor climate changes sharply, the comfort is poor, and it is easy to dry. The external manifestation of high energy consumption is that the indoor climate changes sharply and the cooling capacity is wasted. Summary of the invention

[0003] The object of the present invention is to overcome at least one defect of the existing air-conditioning indoor unit and provide a cabinet-type air-conditioning indoor unit.

[0004] Specifically, the present invention proposes a cabinet-type air-conditioning indoor unit, which comprises:

[0005] A housing, wherein an air inlet is disposed at a lower portion of the housing and an air outlet is disposed at an upper portion of the housing;

[0006] A plurality of convection heat exchangers, each of which has an airflow gathering portion and a convection heat exchange portion, and is disposed in the shell; and the airflow gathering portion is in the shape of a cylinder with two ends open and extending in the vertical direction; the convection heat exchange portion is disposed inside the airflow gathering portion, configured to generate heat or cold, and transfer the heat or cold to the air flowing through the inside of the airflow gathering portion; the plurality of airflow gathering portions are disposed in sequence along the vertical direction, and the plurality of airflow gathering portions are coaxially disposed; and

[0007] The air supply device is arranged in the shell and is configured to at least promote the air flow to enter the inner side of each of the air flow gathering parts in sequence from the air inlet, and then flow out from the air supply port after heat exchange with each of the convection heat exchange parts.

[0008] Optionally, the cabinet-type air conditioner indoor unit is configured as follows:

[0009] controlling the flow rate of the refrigerant entering the lowermost counterflow heat exchanger at least according to the evaporation temperature of the first refrigerant, so as to dehumidify the airflow entering from the air inlet;

[0010] The flow rate of the refrigerant entering the uppermost counterflow heat exchanger is controlled at least according to the second refrigerant evaporation temperature, so as to cool the airflow entering from the lower side of the counterflow heat exchanger.

[0011] Optionally, the cabinet-type air-conditioning indoor unit further includes a water receiving tray, which is arranged at the lower side of the lowermost convection heat exchanger; the position of the air inlet is higher than the water receiving tray and lower than the lowermost airflow gathering portion.

[0012] Optionally, the air supply device includes one or more first fans, and each of the first fans is arranged between two adjacent airflow gathering parts.

[0013] Optionally, the air supply device further includes a second fan, which is arranged on the upper side of the uppermost airflow converging portion.

[0014] Optionally, each of the first fans is an axial flow fan, and each of the second fans is a centrifugal fan.

[0015] Optionally, each of the convection heat exchange portions and the corresponding airflow gathering portion define a plurality of airflow channels extending along the axial direction of the airflow gathering portion.

[0016] Optionally, each of the convection heat exchange parts includes a refrigerant pipeline and heat dissipation fins arranged on the refrigerant pipeline.

[0017] Optionally, the refrigerant pipeline includes a plurality of heat exchange plates, each of which has a first edge and a second edge extending in the axial direction of the airflow converging portion; the first edge is arranged in the middle of the inner space of the airflow converging portion, and the second edge is connected to the inner wall surface of the airflow converging portion; each of the heat exchange plates is provided with a plurality of first refrigerant channels; or,

[0018] The refrigerant pipeline includes one or more coaxially arranged cylindrical structures, and each of the cylindrical structures is coaxially arranged with the airflow gathering portion; the cylindrical structure includes at least one heat exchange cylinder, and one or more second refrigerant channels are arranged on the cylinder wall of each heat exchange cylinder.

[0019] Optionally, each of the convection heat exchange parts is an integrated machined part, and is formed by an extrusion process; or, each of the convection heat exchange parts and the corresponding airflow gathering part form a whole that is an integrated machined part, and is formed by an extrusion process.

[0020] In the cabinet-type air conditioner indoor unit of the present invention, because it has a convection heat exchanger, the airflow organization of the convection heat exchanger is optimized, the flow velocity is increased, the local resistance of the refrigerant pipeline such as the elbow is reduced, the heat exchange coefficient is increased, and the purpose of reducing production costs, reducing occupied space, and increasing the heat exchange coefficient is achieved, and the energy efficiency of the air conditioner is improved. Further, the production process is reduced, such as the convection heat exchanger is extruded and molded in one piece.

[0021] Furthermore, in the indoor unit of the cabinet-type air conditioner of the present invention, the convection heat exchanger on the lower side can be used for dehumidification, and the convection heat exchanger on the upper side can be used for refrigeration, with clear division of labor and energy saving of the system. The refrigerant flow rate in the convection heat exchanger is adjusted to control the evaporation temperature of the refrigerant. The principle of the dehumidification function is that the evaporation temperature of the refrigerant is slightly lower than the dew point temperature of the air, saving refrigeration capacity for dehumidification, and superheated evaporation of the refrigerant in the subsequent refrigeration section can be achieved, so that the refrigeration capacity saved by dehumidification is used to reduce the air temperature, achieving a reasonable distribution of refrigeration capacity and energy saving of the system. The principle of the refrigeration function is that the evaporation temperature of the refrigerant floats above the dew point temperature of the air, reducing the sensible heat of the air. Since dehumidification has been done before and the latent heat has been eliminated, the energy consumption of eliminating sensible heat in refrigeration is less at this time. Compared with the single evaporator air conditioner that cannot reasonably allocate the refrigeration capacity, the independent control of temperature and humidity of the present invention has better effect and higher energy efficiency. Independent control of temperature and humidity avoids the waste of refrigeration capacity, and the indoor climate changes mildly and the comfort is better.

[0022] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0024] Figure 1 is a schematic structural diagram of a cabinet-type air conditioner indoor unit according to an embodiment of the present invention;

[0025] Figure 2 is a schematic cross-sectional view of a convection heat exchanger in a floor-standing type air conditioner indoor unit according to an embodiment of the present invention;

[0026] Figure 3 is a schematic cross-sectional view of a convection heat exchanger in a floor-standing type air conditioner indoor unit according to an embodiment of the present invention;

[0027] Figure 4 is a schematic cross-sectional view of a local structure of a convection heat exchanger in a floor-standing type air conditioner indoor unit according to an embodiment of the present invention;

[0028] Figure 5 is a schematic cross-sectional view of a local structure of a convection heat exchanger in a floor-standing type air conditioner indoor unit according to an embodiment of the present invention;

[0029] Figure 6 is a schematic cross-sectional view of a convection heat exchanger in a floor-standing type air conditioner indoor unit according to an embodiment of the present invention;

[0030] Figure 7 is a schematic cross-sectional view of a convection heat exchanger in a floor-standing type air conditioner indoor unit according to an embodiment of the present invention;

[0031] Figure 8 4 is a schematic cross-sectional view of a convection heat exchanger in an indoor unit of a floor-standing air conditioner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] Figure 1 FIG. 1 is a schematic structural diagram of a cabinet-type air conditioner indoor unit according to an embodiment of the present invention. Figure 1 Shown and referenced Figures 2 to 8 The embodiment of the present invention provides a cabinet-type air conditioner indoor unit, which includes a housing 100, a plurality of convection heat exchangers 200 and an air supply device 300. The housing 100 is provided with an air inlet 110 at the lower part and an air supply port 120 at the upper part. Each convection heat exchanger 200 may include an airflow gathering portion 20 and a convection heat exchange portion 30. The airflow gathering portion 20 is cylindrical with openings at both ends and extending in the vertical direction. Further, the outer contour of the cross section of the airflow gathering portion 20 is circular, semicircular, square or fan-shaped. The convection heat exchange portion 30 is arranged on the inner side of the airflow gathering portion 20, configured to generate heat or cold, and transfer the heat or cold to the air flowing through the inner side of the airflow gathering portion 20. The airflow gathering portion 20 is located on the outer shell surface of the convection heat exchanger 200, and can be directly used as the outer shell of the convection heat exchanger 200. Multiple airflow gathering portions 20 are arranged in sequence along the vertical direction and are coaxially arranged. The air supply device 300 is disposed in the housing 100 and is configured to at least promote airflow to enter the inner sides of the plurality of airflow gathering parts 20 from the air inlet 110 in sequence, and then flow out from the air supply port 120 after heat exchange with each convection heat exchange part 30 .

[0033] In the cabinet-type air-conditioning indoor unit of the embodiment of the present invention, because there is a convection heat exchanger 200, the airflow organization of the convection heat exchanger is optimized, the flow velocity is increased, the local resistance of the refrigerant pipeline such as the elbow is reduced, the heat exchange coefficient is improved, and the purpose of reducing production costs, reducing occupied space, and improving the heat exchange coefficient is achieved, and the energy efficiency of the air conditioner is improved. Furthermore, each airflow gathering portion 20 can also gather airflow to enhance the disturbance convection heat exchange of the convection heat exchanger. In some embodiments of the present invention, the airflow gathering portion 20 is configured to absorb heat or cold from its inner wall surface and transfer heat or cold to the outside from its outer wall surface. The convection heat exchange portion 30 is also configured to transfer heat or cold to the inner wall surface of the airflow gathering portion 20, so that the convection heat exchanger 200 is a radiation convection heat exchanger.

[0034] Furthermore, in the cabinet-type air-conditioning indoor unit of the present invention, the convection heat exchanger 200 on the lower side can be used for dehumidification, and the convection heat exchanger 200 on the upper side can be used for refrigeration, with clear division of labor and energy saving of the system. That is to say, multiple convection heat exchangers 200 can be arranged in parallel or in series, preferably in parallel. At least the convection heat exchanger 200 on the lower side is configured to dehumidify the airflow entering from the air inlet 110 by receiving a first preset flow rate of refrigerant; at least the convection heat exchanger 200 on the upper side is configured to cool the airflow entering from its lower side by receiving a second preset flow rate of refrigerant. It can also be said that the cabinet-type air-conditioning indoor unit is configured to control the flow rate of the refrigerant entering the convection heat exchanger 200 on the lower side at least by the evaporation temperature of the first refrigerant, so as to dehumidify the airflow entering from the air inlet 110. And the cabinet type air conditioner indoor unit is further configured to control the flow rate of the refrigerant entering the uppermost convection heat exchanger 200 at least by the second refrigerant evaporation temperature, so as to cool the airflow entering from the lower side of the convection heat exchanger 200. Preferably, there are two convection heat exchangers 200, the lower convection heat exchanger 200 is used for dehumidification, and the upper convection heat exchanger 200 is used for cooling.

[0035] For example, the refrigerant flow rate in the convection heat exchanger 200 is adjusted to control the refrigerant evaporation temperature. The principle of the dehumidification function is that the refrigerant evaporation temperature is slightly lower than the air dew point temperature, saving refrigeration capacity for dehumidification, and superheated evaporation of the refrigerant in the subsequent refrigeration section can be achieved, so that the refrigeration capacity saved by dehumidification is used to lower the air temperature, achieving a reasonable distribution of refrigeration capacity and energy saving of the system. The principle of the refrigeration function is that the refrigerant evaporation temperature floats above the air dew point temperature to reduce the sensible heat of the air. Since dehumidification has been done before and the latent heat has been eliminated, the energy consumption of refrigeration to eliminate sensible heat is less at this time. Compared with a single evaporator air conditioner that cannot reasonably allocate refrigeration capacity, the independent temperature and humidity control of the present invention is better and more energy-efficient. Independent control of temperature and humidity avoids wasting refrigeration capacity, and indoor climate changes are mild and comfortable.

[0036] In some embodiments of the present invention, Figures 2 to 8 As shown, the convection heat exchange part 30 includes a refrigerant pipeline and heat dissipation fins 33 arranged on the refrigerant pipeline. Preferably, the convection heat exchange part 30 and the airflow gathering part 20 define a plurality of airflow channels extending along the axial direction of the airflow gathering part 20 to facilitate airflow flow, significantly optimize the airflow organization of the convection heat exchanger 200, and increase the flow velocity.

[0037] In some preferred embodiments of the present invention, Figure 2 and Figure 3 As shown, the refrigerant pipeline includes a plurality of heat exchange plates 31, each of which is provided with a plurality of first refrigerant channels 32 extending along the length direction or the width direction of the heat exchange plate 31. There are a plurality of heat dissipation fins 33, which are mounted on the plurality of heat exchange plates 31.

[0038] Furthermore, each heat exchange plate 31 has a first edge and a second edge extending in the axial direction of the airflow converging portion 20. The first edge is disposed in the middle of the inner space of the airflow converging portion 20, and the second edge is connected to the inner wall surface of the airflow converging portion 20. The plurality of heat exchange plates 31 are evenly distributed in the circumferential direction of the airflow converging portion 20. For example, each heat exchange plate 31 extends in the axial direction of the airflow converging portion 20 and in the radial direction of the airflow converging portion 20, such as Figure 2 Optionally, each heat exchange plate 31 is arranged to intersect with the radial direction of the second edge of the airflow converging portion 20 toward the heat exchange plate 31, as shown in FIG. Figure 3 shown.

[0039] In some embodiments of the present invention, a plurality of heat dissipation fins 33 are arranged in sequence along the radial direction of the airflow gathering portion 20 between every two adjacent heat exchange plates 31, and each heat dissipation fin 33 is provided with one or more heat dissipation holes to form a hollow structure. Each first refrigerant channel 32 extends in the axial direction of the airflow gathering portion 20. The plurality of first refrigerant channels 32 in each heat exchange plate 31 are arranged in sequence from the first edge to the second edge.

[0040] Along the radial direction of the airflow converging portion 20, the interval between two adjacent heat fins 33 in the plurality of heat fins 33 between every two adjacent heat exchange plates 31 has a plurality of distance values, so that the arrangement density of the plurality of heat fins 33 is different. For example, along the radial direction of the airflow converging portion 20, the plurality of distance values ​​become smaller in sequence, that is, the heat fins 33 are arranged sparsely first and then densely.

[0041] Specifically, the multiple heat dissipation fins 33 between every two adjacent heat exchange plates 31 are arranged into multiple groups, each group of heat dissipation fins 33 has at least two heat dissipation fins 33, and the distance between every two adjacent heat dissipation fins 33 in each group of heat dissipation fins 33 is equal to the above-mentioned distance value, so that the interval size between the heat dissipation fins 33 between every two adjacent heat exchange plates 31 has multiple distance values, and two adjacent groups can share one heat dissipation fin 33, that is, use one common heat dissipation fin 33 for grouping.

[0042] In each heat exchange plate 31, multiple first refrigerant channels 32 are arranged in sequence from the first edge to the second edge, and the spacing between two adjacent first refrigerant channels 32 has one or more spacing values. The multiple spacing values ​​become smaller in sequence. The multiple first refrigerant channels 32 on each heat exchange plate 31 are arranged into multiple groups, each group of first refrigerant channels 32 has at least two first refrigerant channels 32, and the distance between every two adjacent first refrigerant channels 32 in each group of first refrigerant channels 32 is equal to one of the above spacing values, so that the spacing between the first refrigerant channels 32 on each heat exchange plate 31 has multiple spacing values, and two adjacent groups can share one first refrigerant channel 32, that is, grouping is performed using one shared first refrigerant channel 32.

[0043] In the direction from the first edge to the second edge, the ratio between the number of first refrigerant channels 32 and the number of heat dissipation fins 33 is 4 / 5 to 10 / 1, preferably 1 / 1 to 10 / 1. Each heat dissipation fin 33 is in an arc shape that arches toward the outside of the airflow gathering portion 20. The cross-sectional profile of each first refrigerant channel 32 is a rectangle or a circle or other regular or irregular shape. The hydraulic radius of each first refrigerant channel 32 is 0.1 to 10 mm; the number of first refrigerant channels 32 on each heat exchange plate 31 is 10 to 50. The number of heat exchange plates 31 is 4 to 50. In some embodiments of the present invention, in the direction from the first edge to the second edge, the spacing between two adjacent first refrigerant channels 32 is one, that is, multiple first refrigerant channels 32 are arranged at equal intervals. The distance between two adjacent heat dissipation fins 33 among the multiple heat dissipation fins 33 between every two adjacent heat exchange plates 31 is one, that is, multiple heat dissipation fins 33 between every two adjacent heat exchange plates 31 are arranged at equal intervals.

[0044] In some optional embodiments of the present invention, Figure 4 As shown, each heat dissipation fin 33 may be a flat sheet heat dissipation fin 34. Both sides of each heat exchange plate 31 are provided with the above-mentioned flat sheet heat dissipation fins 34 arranged in sequence from the corresponding first edge to the second edge. Each heat dissipation fin 33 is perpendicular to the corresponding heat exchange plate 31. In other optional embodiments of the present invention, such as Figure 5As shown, each heat dissipation fin 33 can be a needle-shaped heat dissipation fin 35, and a plurality of needle-shaped heat dissipation fins 35 perpendicular to the heat exchange plate 31 are provided on both sides of each heat exchange plate 31. In some alternative embodiments of the present invention, other types of heat dissipation fins, such as tree-shaped heat dissipation fins, irregular-shaped heat dissipation fins, etc., can also be provided on both sides of each heat exchange plate 31. Further, the heat exchange plate 31 is preferably integrally formed with the heat dissipation fin 33.

[0045] In some alternative embodiments of the present invention, such as Figure 6 As shown, the heat dissipation fins on one side of each heat exchange plate 31 are first heat dissipation fins and form a first fin group; the heat dissipation fins on the other side are second heat dissipation fins and form a second fin group. Among the first fin group and the second fin group between two adjacent heat exchange plates 31: at least some of the first heat dissipation fins, each first heat dissipation fin extends along the extension plane in its width direction through the gap between the ends of two adjacent second heat dissipation fins, so that the first heat dissipation fin faces the gap between the ends of two adjacent second heat dissipation fins; and at least some of the second heat dissipation fins, each second heat dissipation fin extends along the extension plane in its width direction through the gap between the ends of two adjacent first heat dissipation fins, so that the second heat dissipation fin faces the gap between the ends of two adjacent first heat dissipation fins. Such a setting can make the relative positions of the heat dissipation fins and the gaps between the heat dissipation fins arranged staggeredly, and the heat dissipation fins on the adjacent side are aligned with the gaps on the adjacent other side, achieving the effect of enhancing the convective heat transfer coefficient of both increasing the disturbance of the flowing air and not blocking the flowing air path.

[0046] Optionally, each first heat dissipation fin and each second heat dissipation fin extend from the corresponding heat exchange plate 31 to the corresponding side of the heat exchange plate 31 and radially outward of the convective heat transfer part 30. Preferably, the plurality of first heat dissipation fins on one side of each heat exchange plate 31 and the plurality of second heat dissipation fins on the other side of the heat exchange plate 31 are symmetrically arranged with respect to the heat exchange plate 31. Further, there is a gap between the first fin group and the second fin group between two adjacent heat exchange plates 31, that is to say, the first fin group and the second fin group are on both sides of the angular bisecting plane between the corresponding two adjacent heat exchange plates 31, and can also be symmetrically arranged with respect to the angular bisecting plane.

[0047] In some embodiments of the present invention, such as Figure 6 As shown, each first refrigerant channel 32 extends along the axial direction of the convective heat transfer part 30; and the cross-sectional profile of each first refrigerant channel 32 can include a first rectangular frame and a plurality of second rectangular frames. The first rectangular frame extends along the direction from the corresponding first edge to the second edge. The plurality of second rectangular frames are arranged on both sides of the first rectangular frame and communicate with the internal space of the first rectangular frame. Such a setting can make the cross-sectional profile of each first refrigerant channel 32 be approximately in the shapes of "tu", "shi", "shi", "gan", "wang", etc., or a combination of these shapes.

[0048] In other preferred embodiments of the present invention, Figure 7 and Figure 8 As shown, the refrigerant pipeline includes a plurality of coaxially arranged cylindrical structures, and each cylindrical structure is coaxially arranged with the airflow gathering portion 20. The cylindrical structure includes at least one heat exchange cylinder 36, and a plurality of second refrigerant channels 37 are arranged in the cylinder wall of each heat exchange cylinder 36. There are multiple heat dissipation fins 33. At least the outer side of the innermost cylindrical structure has a plurality of heat dissipation fins 33. For example, the outer side of the innermost cylindrical structure may have a plurality of heat dissipation fins 33, and optionally, the inner side of the innermost cylindrical structure may also have a plurality of heat dissipation fins 33. The inner side of the outermost cylindrical structure has a plurality of heat dissipation fins 33; and the outer side of the outermost cylindrical structure is thermally connected to the inner wall surface of the airflow gathering portion 20 through a plurality of heat dissipation fins 33, or the outer wall surface of the outermost cylindrical structure is integrally formed with or in contact with the inner wall surface of the airflow gathering portion 20.

[0049] Furthermore, there are multiple cylindrical structures, and a fin layer is provided between every two adjacent cylindrical structures, and each fin layer has multiple heat dissipation fins 33 as described above. Preferably, the multiple heat dissipation fins 33 of each fin layer are heat dissipation fins uniformly distributed along the circumferential direction of the airflow gathering portion 20; and each heat dissipation fin 33 extends along the axial direction of the airflow gathering portion 20 to define multiple airflow channels. Each heat dissipation fin 33 may be provided with one or more heat dissipation holes. When the outer side of the outermost cylindrical structure is thermally connected to the inner wall surface of the airflow gathering portion 20 through multiple heat dissipation fins 33, that is, the outer side of the outermost cylindrical structure is thermally connected to the inner wall surface of the airflow gathering portion 20 through a fin layer. In some alternative embodiments, the heat dissipation fins 33 are flat sheet-like heat dissipation fins or needle-like heat dissipation fins.

[0050] Each second refrigerant channel 37 extends in the axial direction of the airflow converging portion 20. The multiple second refrigerant channels 37 in the barrel wall of each heat exchange barrel 36 are sequentially arranged along the circumferential direction of the heat exchange barrel 36. The cross-sections of the multiple second refrigerant channels 37 in the barrel wall of each heat exchange barrel 36 may include a circle and a polygon, and the polygon may be an approximately rectangular structure. The polygonal second refrigerant channels and the circular second refrigerant channels are sequentially alternately arranged along the circumferential direction of the heat exchange barrel 36.

[0051] In some embodiments of the present invention, the cylindrical structure further includes at least one supporting cylinder, each supporting cylinder being disposed between two adjacent heat exchange cylinders 36, or disposed on the inner side of the innermost heat exchange cylinder 36, or disposed between the outermost heat exchange cylinder 36 and the airflow gathering portion 20. Further, the heat dissipating fins 33 may be integrally formed with the corresponding cylindrical structure on the inner side thereof, and the outer side may contact and abut against the corresponding cylindrical structure on the outer side thereof.

[0052] In some embodiments of the present invention, in every two adjacent heat exchange tubes 36, the cross-sectional area of ​​each second refrigerant channel 37 on the outer heat exchange tube 36 is greater than the cross-sectional area of ​​the corresponding second refrigerant channel 37 on the inner heat exchange tube 36. For example, the height of each second refrigerant channel 37 on the outer heat exchange tube 36 extending in the radial direction of the airflow converging portion 20 is greater than the height of each second refrigerant channel 37 on the inner heat exchange tube 36 extending in the radial direction of the airflow converging portion 20.

[0053] In every two adjacent fin layers, the height of the outer heat dissipation fins 33 extending in the radial direction of the airflow converging portion 20 is greater than the height of the inner heat dissipation fins 33 extending in the radial direction of the airflow converging portion 20. The wall thickness of each heat dissipation fin 33 is 0.2 to 1 mm, and the distance between every two adjacent heat dissipation fins 33 in each fin layer is 0.5 to 10 mm. The hydraulic radius of each second refrigerant channel 37 is 0.6 to 10 mm.

[0054] In some embodiments of the present invention, the convection heat exchange portion 30 defines a central channel 38 extending along the axial direction of the airflow gathering portion 20, which is located in the center of the inner space of the airflow gathering portion 20. The central channel 38 can be configured to circulate air or refrigerant. In other embodiments, closed structures are provided at both ends of the central channel 38, and the central channel 38 can also be configured to be provided with accessories such as a shunt pipe. Each first refrigerant channel 32 / second refrigerant channel 37 is preferably a microchannel tube. The heat exchange plate 31, the heat exchange tube 36, and the airflow gathering portion 20 can all be made of copper or aluminum.

[0055] In some embodiments of the present invention, in order to facilitate processing and manufacturing, the convection heat exchange part 30 is formed by an extrusion process, that is, the convection heat exchange part 30 is preferably an integrated machined part. Or, the convection heat exchange part 30 and the airflow gathering part 20 are formed as a whole by an extrusion process. In other words, the convection heat exchange part 30 and the airflow gathering part 20 are formed as a whole as an integrated machined part. The heat dissipation fins 33 are directly connected to the wall surface of the first refrigerant channel 32 / the second refrigerant channel 37, and belong to the same component. There is no problem of contact thermal resistance between the two, which can significantly reduce the heat transfer thermal resistance between the refrigerant and the air and increase the heat exchange performance.

[0056] In some embodiments of the present invention, the refrigerant pipeline also has a main inlet pipe and a main outlet pipe; one end of each first refrigerant channel 32 / second refrigerant channel 37 is connected to the main inlet pipe, and the other end is connected to the main outlet pipe, so that multiple first refrigerant channels 32 / second refrigerant channels 37 are connected in parallel. Furthermore, a collecting inlet pipe or a collecting outlet pipe may be provided at the end of each heat exchange plate 31 or heat exchange tube 36, and it is arranged directly opposite to the heat exchange plate 31 or heat exchange tube 36, and will not hinder the flow of airflow in the convection heat exchange part 30. That is, at both ends of each heat exchange plate 31 or heat exchange tube 36, there are refrigerant diversion tube bundles and collecting tube bundles, which are arranged according to the refrigerant flow position of the pipeline cross section to guide the flow of refrigerant. The air flow channel position is thus reserved to ensure smooth forced flow of air.

[0057] In other embodiments of the present invention, the counter-flow heat exchanger 200 may have at least one parallel unit, each parallel unit having a plurality of channel groups. Each channel group has at least one first refrigerant channel 32 / second refrigerant channel 37; the multiple channel groups of each parallel unit are arranged in series from head to tail. When there are multiple parallel units, the multiple parallel units are connected in parallel. Each channel group may have one of the above-mentioned heat exchange plates 31. For example, the number of heat exchange plates 31 is 20, wherein every 5 heat exchange plates 31 constitute 5 channel groups, which are arranged in series from head to tail, that is, every 5 heat exchange plates 31 constitute a parallel unit, that is, a total of 4 parallel units, and these 4 parallel units are connected in parallel with each other. Furthermore, a collecting inlet pipe or a collecting outlet pipe may be provided at the end of each heat exchange plate 31 or heat exchange tube 36, and it is arranged directly opposite to the heat exchange plate 31 or heat exchange tube 36, which will not hinder the flow of airflow in the counter-flow heat exchange part 30 and facilitates the reasonable arrangement of pipelines.

[0058] In some embodiments of the present invention, the cabinet-type air conditioner indoor unit further includes a water receiving tray 400 disposed at the lower side of the countercurrent heat exchanger 200. The air inlet 110 is located higher than the water receiving tray 400 and lower than the airflow gathering portion.

[0059] In some embodiments of the present invention, the air supply device 300 includes one or more first fans 310, each of which is disposed between two adjacent airflow gathering parts 20. For example, there may be two airflow gathering parts 20, and the first fan 310 is an axial flow fan, which is disposed between the two airflow gathering parts 20 to promote the airflow to flow from the inner side of the lower airflow gathering part 30 to the inner side of the upper airflow gathering part 30. Further, the air supply device 300 also includes a second fan 320, which is disposed on the upper side of the uppermost airflow gathering part 20. The second fan may be a centrifugal fan.

[0060] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A cabinet-type air conditioner indoor unit, characterized in that: include: A housing, wherein an air inlet is disposed at a lower portion of the housing and an air outlet is disposed at an upper portion of the housing; A plurality of convection heat exchangers, each of which has an airflow gathering portion and a convection heat exchange portion, and is disposed in the shell; and the airflow gathering portion is in the shape of a cylinder with two ends open and extending in the vertical direction; the convection heat exchange portion is disposed inside the airflow gathering portion, configured to generate heat or cold, and transfer the heat or cold to the air flowing through the inside of the airflow gathering portion; the plurality of airflow gathering portions are disposed in sequence along the vertical direction, and the plurality of airflow gathering portions are coaxially disposed; and An air supply device is disposed in the housing and is configured to at least cause the air flow to enter the inner sides of the plurality of air flow gathering parts in sequence from the air inlet, and after heat exchange with each of the convection heat exchange parts, flow out from the air supply port; The cabinet type air conditioner indoor unit is configured as follows: controlling the flow rate of the refrigerant entering the lowermost counterflow heat exchanger at least according to the evaporation temperature of the first refrigerant, so as to dehumidify the airflow entering from the air inlet; Controlling the flow rate of the refrigerant entering the uppermost counterflow heat exchanger at least according to the evaporation temperature of the second refrigerant, so as to cool the airflow entering from the lower side of the counterflow heat exchanger; Each of the convection heat exchange parts includes a refrigerant pipeline and a heat dissipation fin arranged on the refrigerant pipeline; The refrigerant pipeline includes a plurality of heat exchange plates, each of which has a first edge and a second edge extending in the axial direction of the airflow gathering portion; the first edge is arranged in the middle of the inner space of the airflow gathering portion, and the second edge is connected to the inner wall surface of the airflow gathering portion; a plurality of first refrigerant channels are arranged in each heat exchange plate; a plurality of heat dissipation fins arranged in sequence in the radial direction of the airflow gathering portion are arranged between every two adjacent heat exchange plates, and each heat dissipation fin is provided with one or more heat dissipation holes; each of the first refrigerant channels extends in the axial direction of the airflow gathering portion; the plurality of first refrigerant channels in each heat exchange plate are arranged in sequence from the first edge to the second edge; or, The refrigerant pipeline includes one or more coaxially arranged cylindrical structures, and each of the cylindrical structures is coaxially arranged with the airflow gathering part; at least the outer side of the innermost cylindrical structure has a plurality of the heat dissipation fins, and the inner side of the outermost cylindrical structure has a plurality of the heat dissipation fins; the cylindrical structure includes at least one heat exchange cylinder, and one or more second refrigerant channels are arranged on the cylinder wall of each heat exchange cylinder.

2. The cabinet type air conditioner indoor unit according to claim 1, characterized in that: Also includes: A water receiving tray is arranged at the lower side of the lowermost countercurrent heat exchanger; the position of the air inlet is higher than the water receiving tray and lower than the lowermost airflow gathering portion.

3. The cabinet type air conditioner indoor unit according to claim 1, characterized in that: The air supply device includes one or more first fans, and each of the first fans is arranged between two adjacent airflow gathering parts.

4. The cabinet type air conditioner indoor unit according to claim 3, characterized in that: The air supply device further includes a second fan, which is arranged on the upper side of the uppermost airflow converging portion.

5. The cabinet type air conditioner indoor unit according to claim 4, characterized in that: Each of the first fans is an axial flow fan, and each of the second fans is a centrifugal fan.

6. The cabinet type air conditioner indoor unit according to claim 1, characterized in that: Each of the convection heat exchange portions and the corresponding airflow converging portion define a plurality of airflow channels extending along the axial direction of the airflow converging portion.

7. The cabinet type air conditioner indoor unit according to claim 1, characterized in that: Each of the convection heat exchange parts is an integrated part and is formed by extrusion process; or, Each of the convection heat exchange parts and the corresponding airflow gathering part is formed as a one-piece processed part and is formed by an extrusion process.

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