Air pipe type air conditioner

Abstract

An air duct type air conditioner relates to the technical field of refrigeration and is used for solving the problem of poor heat exchange effect of the air duct type air conditioner, and an indoor unit of the air duct type air conditioner comprises a shell, a partition plate, an indoor heat exchanger and a fan assembly. A containing space is defined in the shell, the partition plate is arranged in the shell and divides the containing space into a fan cavity and a heat exchange channel, and the partition plate is provided with ventilation holes communicating the fan cavity with the heat exchange channel. The indoor heat exchanger is arranged in the heat exchange channel, and the fan assembly is arranged in the fan cavity and used for guiding air in the fan cavity into the heat exchange channel through the ventilation holes. The heat exchange channel comprises a mounting section and an expansion section, an indoor heat exchanger is arranged on the mounting section, the expansion section is arranged between the mounting section and the partition plate, the two opposite sides of the expansion section are connected with the partition plate and the mounting section correspondingly, the caliber of the expansion section is gradually increased in the first direction, and the first direction is the direction from the fan assembly to the indoor heat exchanger. The air pipe type air conditioner is used for improving the heat exchange performance of the indoor unit.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to a duct-type air conditioner. Background Art

[0002] The indoor unit of the duct air conditioner is a duct unit. Due to the advantages of the duct unit such as concealed installation and easy coordination with home decoration ceiling, the duct air conditioner has better aesthetics when installed indoors.

[0003] In the shell of the duct air conditioner, air flows from the fan cavity through the ventilation holes into the heat exchange channel, and exchanges heat with the indoor heat exchanger in the heat exchange channel through heat convection and heat radiation effects to heat or reduce the temperature of the air flow.

[0004] However, since there is a vortex area near the ventilation hole in the heat exchange channel, the airflow generates backflow here, which makes the air intake volume of the indoor heat exchanger small, resulting in poor heat exchange effect of the indoor heat exchanger. Utility Model Content

[0005] The present application provides a duct type air conditioner, which is used to solve the problem of poor heat exchange effect of the duct type air conditioner.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A duct type air conditioner includes an indoor unit, the indoor unit includes a shell, a partition, an indoor heat exchanger and a fan assembly. The shell defines a receiving space inside, the partition is arranged in the shell, and the receiving space is divided into a fan cavity and a heat exchange channel, and the partition is provided with a ventilation hole connecting the fan cavity and the heat exchange channel. The indoor heat exchanger is arranged in the heat exchange channel, and the fan assembly is arranged in the fan cavity, and is used to introduce the air in the fan cavity into the heat exchange channel through the ventilation hole.

[0008] The heat exchange channel includes an installation section and an expansion section. The installation section is provided with an indoor heat exchanger. The expansion section is provided between the installation section and the partition. The opposite sides of the expansion section are respectively connected to the partition and the installation section. The diameter of the expansion section gradually increases along a first direction. The first direction is the direction from the fan assembly to the indoor heat exchanger.

[0009] It can be understood that the two opposite sides of the expansion section are connected to the partition and the installation section respectively, and the diameter of the expansion section gradually increases along the first direction, so that the expansion section can rectify the airflow coming out of the ventilation hole, and the airflow can flow smoothly along the expansion section to the indoor heat exchanger, thereby eliminating the turbulent area in the heat exchange channel. In this way, on the one hand, the reflux phenomenon of the airflow to the ventilation hole is improved, so that the air intake of the indoor heat exchanger is increased, and the heat exchange effect of the indoor heat exchanger is improved. On the other hand, the airflow in the expansion section flows more smoothly, reducing the noise during the operation of the duct air conditioner.

[0010] In some embodiments of the present application, the fan assembly includes an impeller, the impeller includes an upper volute and a lower volute, the upper volute and the lower volute together form a fan chamber, the impeller is arranged in the fan chamber, the lower volute includes a first guide section arranged at the ventilation hole and connected to the partition, and the upper volute includes a second guide section arranged at the ventilation hole. The expansion section includes a first expansion surface and a second expansion surface, the opposite sides of the first expansion surface are respectively connected to the first guide section and the mounting section, the second expansion surface is arranged opposite to the first expansion surface, and the opposite sides of the second expansion surface are respectively connected to the second guide section and the mounting section.

[0011] In some embodiments of the present application, the first expansion surface is an arc surface, and the center of the arc surface is located on a side of the arc surface away from the indoor heat exchanger.

[0012] In some embodiments of the present application, the angle between the first guide section and the tangent of the first expansion surface is less than or equal to 10°, and the angle formed by the second guide section and the second expansion surface is less than 10°.

[0013] In some embodiments of the present application, a tangent line of the first expansion surface is tangent to the first guide segment, and an extension surface of the second guide segment is located on the second expansion surface.

[0014] In some embodiments of the present application, the heat exchange channel further includes a tapered section, the tapered section is located on the side of the installation section away from the expansion section, and the diameter of the tapered section gradually decreases along the first direction.

[0015] In some embodiments of the present application, the mounting section includes a first mounting surface and a second mounting surface, the first mounting surface is connected to the first expansion surface, the second mounting surface is arranged opposite to the first mounting surface, and the second mounting surface is connected to the second expansion surface;

[0016] The tapered section includes a first tapered surface and a second tapered surface. The first tapered surface is connected to the side of the first mounting surface away from the first expansion surface. The second tapered surface is arranged opposite to the first tapered surface and connected to the side of the second mounting surface away from the second expansion surface.

[0017] In some embodiments of the present application, the indoor heat exchanger includes a first heat exchange part, a second heat exchange part and a third heat exchange part, the first heat exchange part is inclined on the first mounting surface, the windward surface of the second heat exchange part is parallel to the plane where the partition is located, and the third heat exchange part is inclined on the second mounting surface. A recess is formed on the windward side of each of the first heat exchange part and the third heat exchange part, and the bottom wall of the recess is located on the side of the windward surface away from the fan cavity. The side wall surface of at least one recess close to the windward surface is used to guide part of the air entering the heat exchange channel from the ventilation hole to the corresponding bottom wall surface. The angle between the first heat exchange part and the first mounting surface is smaller than the angle between the first tapered surface and the extended surface of the first mounting surface, and the angle between the third heat exchange part and the second mounting surface is smaller than the angle between the second tapered surface and the extended surface of the second mounting surface.

[0018] In some embodiments of the present application, the first mounting surface includes a connecting portion and a drainage groove, the connecting portion is connected to the indoor heat exchanger, and the drainage groove includes a first drainage groove and a second drainage groove arranged on opposite sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0020] Figure 1 A schematic diagram of the connection structure of a duct air conditioner provided in an embodiment of the present application;

[0021] Figure 2 for Figure 1 A schematic diagram of a structure in which a gas-liquid separator and an oil separator are installed between the compressor and the four-way valve shown in FIG.

[0022] Figure 3 for Figure 1 A schematic diagram of a connection structure in which no four-way valve is provided between the compressor and the outdoor heat exchanger and the indoor heat exchanger as shown in FIG.

[0023] Figure 4 It is a structural schematic diagram of a traditional indoor unit;

[0024] Figure 5 A schematic diagram of wind field simulation of another indoor unit with a traditional structure during operation;

[0025] Figure 6 One of the structural schematic diagrams of the indoor unit provided in the embodiment of the present application;

[0026] Figure 7 A schematic diagram of the structure of the heat exchange channel provided in the embodiment of the present application;

[0027] Figure 8 The second structural diagram of the indoor unit provided in the embodiment of the present application;

[0028] Fig. 9 A schematic diagram of the structure of the first expansion surface provided in an embodiment of the present application;

[0029] Fig.10 A schematic diagram of the connection structure of the guide section and the expansion section provided in an embodiment of the present application;

[0030] Fig.11 The third structural diagram of the indoor unit provided in the embodiment of the present application;

[0031] Fig.12 One of the structural schematic diagrams of the heat exchange channel provided in the embodiment of the present application;

[0032] Fig.13 The second structural schematic diagram of the heat exchange channel provided in the embodiment of the present application;

[0033] Fig.14 for Fig.13 Schematic diagram of the enlarged structure at position A.

[0034] Reference numerals:

[0035] Air conditioner 100;

[0036] Compressor 10; four-way valve 20; outdoor heat exchanger 30; throttling device 40;

[0037] Indoor unit 500;

[0038] Indoor heat exchanger 50; first heat exchange part 501; recessed part 5010; bottom wall surface 5011; side wall surface 5012; first end 5013; second end 5014; second heat exchange part 502; third heat exchange part 503;

[0039] Shell 51; fan chamber 511; heat exchange channel 512; expansion section 513; first expansion surface 5131; second expansion surface 5132; mounting section 514; first mounting section 5141; connecting portion 51411; drainage groove 51410; first drainage groove 51412; second drainage groove 51413; second mounting section 5142; tapered section 515; first tapered surface 5151; second tapered surface 5152; air outlet 516;

[0040] Partition 52; Ventilation hole 521;

[0041] Fan assembly 53; volute 531; upper volute 5311; first guide section 53111; lower volute 5312; second guide section 53121; blade 532;

[0042] Gas-liquid separator 61; Oil separator 62;

[0043] The first area A1; the second area A2; the third area A3. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0046] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0047] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, when describing a pipeline, the "connected" and "connection" used in this application have the meaning of conduction. The specific meaning needs to be understood in conjunction with the context.

[0048] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0049] An air conditioner is a device that can adjust and control the temperature, humidity and circulating air of the ambient air in a building or structure.

[0050] Figure 1 FIG. 1 shows a schematic diagram of a connection structure of a duct type air conditioner provided in an embodiment of the present application. Figure 1 As shown, the present application provides a duct type air conditioner (hereinafter referred to as air conditioner 100), which may include a compressor 10, a four-way valve 20, an outdoor heat exchanger 30, a throttling device 40 and an indoor heat exchanger 50. For example, referring to Figure 1 The four-way valve 20 may have a first port A, a second port B, a third port C and a fourth port D, and the compressor 10 may have a return air port and an outlet air port (not shown in the figure).

[0051] The return air end of the compressor 10 can be connected to the first port A of the four-way valve, the outlet air end of the compressor 10 can be connected to the second port B of the four-way valve, the third port C of the four-way valve can be connected to one end of the outdoor heat exchanger 30, the other end of the outdoor heat exchanger 30 can be connected to one end of the indoor heat exchanger 50 through the throttling device 40, and the other end of the indoor heat exchanger 50 can be connected to the fourth port D of the four-way valve.

[0052] The air conditioner 100 may include an indoor unit and an outdoor unit. The compressor 10, the four-way valve 20 and the outdoor heat exchanger 30 may be part of the outdoor unit, and the corresponding indoor heat exchanger 50 may be part of the indoor unit. The throttling device 40 may be a capillary structure or an electronic expansion valve structure. The throttling device 40 may be installed in the outdoor unit or in the indoor unit. The throttling device 40 may also be installed in the refrigerant pipeline between the outdoor unit and the indoor unit. The throttling device 40 only needs to be located between the indoor heat exchanger 50 and the outdoor heat exchanger 30 along the flow direction of the refrigerant.

[0053] Based on this, driven by the compressor 10, the refrigerant can circulate between the indoor unit and the outdoor unit and produce a reversible phase change. While the refrigerant produces a phase change, it can release or absorb heat through the indoor heat exchanger.

[0054] For example, the refrigerant in the outdoor unit can exchange heat with the surrounding medium (such as air) through the outdoor heat exchanger 30, thereby releasing heat and heating the surrounding air (or absorbing heat to cool the nearby air). The refrigerant in the indoor unit can exchange heat with the surrounding air through the indoor heat exchanger 50, thereby absorbing heat to cool the surrounding air (or releasing heat to heat the nearby air).

[0055] By setting the four-way valve 20, the operation mode of the air conditioner 100 can be flexibly adjusted between the hot-cooling condition and the heating condition, so that the air conditioner 100 can be applied to more usage scenarios.

[0056] When the air conditioner 100 is in cooling or dehumidification mode, Figure 1 Taking the solid arrow shown in FIG. 2 as an example, the four-way valve 20 can be adjusted to connect the second port B and the third port C, and to connect the fourth port D and the first port A.

[0057] In this way, the high-pressure gaseous refrigerant compressed by the compressor 10 can flow from the outlet end through the second port B and the third port C of the four-way valve 20 to the outdoor heat exchanger 30, so that the high-temperature and high-pressure gaseous refrigerant can be liquefied and release heat at the outdoor heat exchanger 30 to heat the air near the outdoor heat exchanger 30.

[0058] Subsequently, under the action of the throttling device 40, the pressure of the liquid refrigerant passing through the throttling device 40 and flowing into the indoor heat exchanger 50 is reduced, so that the liquid refrigerant can absorb heat and vaporize at the indoor heat exchanger 50, thereby exchanging and transferring heat between the outdoor heat exchanger 30 and the indoor heat exchanger 50 and cooling the air near the indoor heat exchanger 50. The refrigerant flowing out of the indoor heat exchanger 50 after vaporization can flow through the fourth port D and the first port A of the four-way valve 20 in sequence, and then the gaseous refrigerant can be sucked into the compressor 10 through the return air end and compressed, thereby realizing the circulation of the refrigerant.

[0059] When the air conditioner 100 is in the heating state, Figure 1 Taking the dashed arrow shown in FIG. 2 as an example, the four-way valve 20 can be adjusted to connect the second port B and the fourth port D, and to connect the third port C and the first port A.

[0060] In this way, the high-temperature and high-pressure gaseous refrigerant compressed by the compressor 10 can flow from the outlet end through the second port B and the fourth port D of the four-way valve 20 to the indoor heat exchanger 50, so that the high-temperature and high-pressure gaseous refrigerant can be liquefied and release heat at the indoor heat exchanger 50 to heat the air near the indoor heat exchanger 50.

[0061] Subsequently, under the action of the throttling device 40, the pressure of the liquid refrigerant passing through the throttling device 40 and flowing into the outdoor heat exchanger 30 is reduced, so that the liquid refrigerant can absorb heat and vaporize at the outdoor heat exchanger 30, thereby exchanging and transferring heat between the outdoor heat exchanger 30 and the indoor heat exchanger 50 and cooling the air around the outdoor heat exchanger 30. The vaporized refrigerant can flow through the third port C and the first port A of the four-way valve 20 in sequence, and then the gaseous refrigerant can be sucked into the compressor 10 through the return air end and compressed, thereby realizing the circulation of the refrigerant.

[0062] Figure 2 Shows Figure 1 A schematic diagram of a structure in which a gas-liquid separator and an oil separator are installed between the compressor and the four-way valve in order to prevent the gaseous refrigerant sucked into the compressor 10 from being mixed with liquid refrigerant or impurities from the return air end of the compressor 10. Figure 2 As shown, the air conditioner 100 may further include a gas-liquid separator 61, which may be installed between the first port A of the four-way valve 20 and the return air end of the compressor 10, so that the first port A can be connected and conducted with the return air end of the compressor 10 through the gas-liquid separator 61. In this way, when the gaseous refrigerant mixed with impurities such as liquid refrigerant or lubricating oil flows to the return air end of the compressor 10 through the gas-liquid separator 61, the gas-liquid separator 61 can separate non-gaseous impurities (such as liquid refrigerant, liquid lubricating oil or other impurities) to prevent the above impurities from entering the compressor 10 and affecting the stable operation of the compressor 10.

[0063] Continue to refer to Figure 2 The air conditioner 100 may further include an oil separator 62, and the outlet end of the compressor 10 and the second port B of the four-way valve 20 may also be connected and conducted through the oil separator 62. In this way, the lubricating oil mixed in the high-temperature and high-pressure gaseous refrigerant can be separated in the process of flowing through the oil separator 62, thereby preventing the lubricating oil from adhering to the inner walls of the outdoor heat exchanger 30 and the indoor heat exchanger 50 when the refrigerant flows through the outdoor heat exchanger 30 and the indoor heat exchanger 50, so that the indoor heat exchanger 50 and the outdoor heat exchanger 30 have a higher heat exchange efficiency.

[0064] In some other embodiments, it is not necessary to provide a four-way valve.

[0065] Figure 3 Shows Figure 1 A schematic diagram of a connection structure in which no four-way valve is provided between the compressor and the outdoor heat exchanger and the indoor heat exchanger, such as Figure 3 As shown, the air outlet of the compressor 10 can be connected to one end of the throttling device 40 through the outdoor heat exchanger 30, and the air return end of the compressor 10 can be connected to the other end of the throttling device 40 through the gas-liquid separator 61 and the indoor heat exchanger 50 in sequence. So that the refrigerant can circulate among the compressor 10, the outdoor heat exchanger 30, the throttling device 40, the indoor heat exchanger 50, the gas-liquid separator 61 and the compressor 10, at this time, the outdoor heat exchanger 30 can be used to heat the nearby air, and the indoor heat exchanger 50 can be used to cool the nearby air, so that the air conditioner 100 operates in a cooling condition or a dehumidification condition (i.e., a cooling-only mode air conditioner).

[0066] Figure 4 shows a schematic diagram of the structure of a traditional indoor unit, Figure 5 A schematic diagram of wind field simulation during operation of an indoor unit of another traditional structure is shown.

[0067] See also Figure 4 and Figure 5 In the conventional structure of the indoor unit 500, the airflow directly enters the heat exchange channel 512 from the fan chamber 511 through the ventilation hole 521. Since the flow channel of the fan chamber 511 is narrow and the flow channel of the heat exchange channel 512 is wide, there are two air supply blind areas (i.e. Figure 4 In the first area A1 and the second area A2 in the air supply blind area, since the pressure field in the air supply blind area is unstable and the direction and size of the air flow are irregular, vortices are easily generated in the air supply blind area, causing part of the air flow to flow out of the ventilation hole 521 and enter the heat exchange channel 512, and then flow back into the ventilation hole 521, thereby reducing the air flow flowing to the indoor heat exchanger 50, affecting the heat exchange effect of the duct air conditioner 100.

[0068] In addition, since there is a large airflow impact near the A3 position of the volute 531, the existence of the air supply blind area will induce pressure oscillation of the volute 531 at the A3 position, forming a pressure oscillation zone, resulting in uneven airflow blowing to the indoor heat exchanger 50, which also affects the heat exchange effect of the duct air conditioner 100.

[0069] Based on this, the present application provides a duct-type air conditioner to solve the problem of low heat exchange effect of the duct-type air conditioner.

[0070] Figure 6 FIG. 1 shows one of the structural diagrams of the indoor unit provided in the embodiment of the present application. Figure 6 The indoor unit 500 includes a shell 51, a partition 52, an indoor heat exchanger 50 and a fan assembly 53.

[0071] The housing 51 defines a storage space inside, a partition 52 is disposed in the housing 51, and the partition 52 divides the storage space into a fan chamber 511 and a heat exchange channel 512. The partition 52 is provided with a ventilation hole 521 connecting the fan chamber 511 and the heat exchange channel 512. The indoor heat exchanger 50 is disposed in the heat exchange channel 512, and the fan assembly 53 is disposed in the fan chamber 511, and is used to introduce the air in the fan chamber 511 into the heat exchange channel 512 through the ventilation hole 521.

[0072] That is to say, the indoor heat exchanger 50 and the fan assembly 53 are spaced apart in the shell 51. The fan assembly 53 sucks the air in the fan chamber 511 and blows it along the ventilation hole 521 to the heat exchange channel 512, exchanging heat with the indoor heat exchanger 50 through heat convection and heat radiation effects.

[0073] Figure 7 The heat exchange channel according to the embodiment of the present invention is shown in FIG. Figure 6 and see Figure 7 The heat exchange channel 512 may include: a mounting section 514 and an expansion section 513, the mounting section 514 is provided with an indoor heat exchanger 50, the expansion section 513 is provided between the mounting section 514 and the partition 52, the opposite sides of the expansion section 513 are respectively connected to the partition 52 and the mounting section 514, and the diameter of the expansion section 513 is along the first direction (i.e. Figure 7 The X-axis direction) gradually increases, wherein the first direction is the direction from the fan assembly 53 to the indoor heat exchanger 50.

[0074] It can be understood that the opposite sides of the expansion section 513 are respectively connected to the partition 52 and the installation section 514, and the diameter of the expansion section 513 gradually increases along the first direction, so that the expansion section 513 can rectify the airflow coming out of the ventilation hole 521, and the airflow flows smoothly along the expansion section 513 to the indoor heat exchanger 50, thereby eliminating the turbulent zone in the heat exchange channel 512 and the pressure oscillation zone of the ventilation hole 521.

[0075] Thus, on the one hand, the phenomenon of airflow backflow to the ventilation hole 521 is improved, so that the air intake of the indoor heat exchanger 50 is increased, and the heat exchange effect of the indoor heat exchanger 50 is improved. On the other hand, because the airflow can flow more smoothly under the guidance of the expansion section 513, the noise generated by the duct air conditioner 100 during operation is reduced.

[0076] Continue reading Figure 6 In some embodiments of the present application, the fan assembly 53 includes an impeller 532, an upper volute 5311 and a lower volute 5312. The upper volute 5311 and the lower volute 5312 together form a fan chamber 511, and the impeller 532 is arranged in the fan chamber 511. In this way, the impeller 532 can suck the outside air into the fan chamber 511 composed of the upper volute 5311 and the lower volute 5312, form a high-speed rotating airflow in the fan chamber 511, and then blow the airflow to the heat exchange channel 512 through the ventilation hole 521.

[0077] Exemplarily, the impeller 532 here can be an open impeller, a closed impeller, or a semi-open impeller. The specific type of the impeller 532 can be selected according to the specific situation, and the present application does not limit this.

[0078] Figure 8 The second structural diagram of the indoor unit 500 provided in the embodiment of the present application is shown. Figure 8 In some embodiments of the present application, the lower volute 5312 includes a first guide section 53111 disposed at the ventilation hole 521 and connected to the partition 52 , and the upper volute 5311 includes a second guide section 53121 disposed at the ventilation hole 521 .

[0079] Correspondingly, the expansion section 513 includes a first expansion surface 5131 and a second expansion surface 5132, and the opposite sides of the first expansion surface are respectively connected to the first guide section 53111 and the mounting section 514, and the second expansion surface 5132 is arranged opposite to the first expansion surface 5131, and the opposite sides of the second expansion surface 5132 are respectively connected to the second guide section 53121 and the mounting section 514.

[0080] That is to say, the opening formed by the first guide section 53111 and the second guide section 53121 is arranged on the inner side of the ventilation hole 521 of the partition 52, and the airflow in the fan chamber 511 enters the expansion section 513 of the heat exchange channel 512 along the first expansion surface 5131 and the second expansion surface 5132 respectively under the guiding action of the first guide section 53111 and the second guide section 53121.

[0081] In a possible structural design, the first expansion surface is an arc surface. Figure 8 As shown, the center of the first expansion surface 5131 (ie, the arc surface) is located on the side of the arc surface away from the indoor heat exchanger 50 .

[0082] It can be understood that, since the vortex direction of the airflow when it flows back to the ventilation hole 521 is clockwise, when the first expansion surface 5131 is set as an arc surface, and the center of the arc surface is located on the side of the arc surface away from the indoor heat exchanger 50, the airflow flows in the counterclockwise direction under the guidance of the first expansion surface 5131, but it is not easy to flow back to the ventilation hole 521 due to the blocking effect of the first expansion surface 5131. Therefore, it is conducive to better reducing the amount of airflow backflow.

[0083] For example, Fig. 9 As shown, the center of the first expansion surface 5131 (arc surface) is located on the side of the arc surface facing the indoor heat exchanger 50. In this way, the airflow can also flow smoothly from the ventilation hole 521 to the indoor heat exchanger 50 under the guidance of the arc-shaped first expansion surface 5131, thereby reducing turbulence.

[0084] In another possible structural design, the first expansion surface 5131 may also be a planar structure, and the airflow flows smoothly to the indoor heat exchanger 50 under the guidance of the planar first expansion surface 5131, thereby playing a role in reducing turbulence.

[0085] In some embodiments of the present application, the angle formed by the tangent of the first guide section 53111 and the first expansion surface 5131, and the angle formed by the second guide section 53121 and the second expansion surface 5132 are both in the range of 0 to 5° or 5 to 10°.

[0086] It is understandable that the transition between the volute 531 and the expansion section 513 should be smooth, and should not be greatly abrupt. The reason is that the wind speed of the fan assembly 53 near the ventilation hole 521 is relatively high (for example, 10 m / s), and if the structural angle of the airflow duct is abruptly changed, it will generate greater noise and air volume loss.

[0087] Fig.10 The schematic diagram of the connection structure of the guide section and the expansion section 513 provided in the embodiment of the present application is shown. Fig.10, exemplarily, the range of values ​​of the angle β1 between the first guide section 53111 and the horizontal plane is: 10°≤β1≤40°, the range of values ​​of the angle β2 between the first expansion surface 5131 and the horizontal plane is: 20°≤β2≤50°; the range of values ​​of the angle β3 between the second guide section 53121 and the horizontal plane is: 0<β3≤10°, the range of values ​​of the angle β4 between the second expansion surface 5132 and the horizontal plane is: β4≤10°, the range of values ​​of the angle β3 between the second guide section 53121 and the horizontal plane is: -10°≤β3≤0, and the range of values ​​of the angle β4 between the second expansion surface 5132 and the horizontal plane is: β4≤20°.

[0088] It should be noted that β3<0 means that the second guide section 53121 extends toward the lower right with the intersection of the second guide section 53121 and the second expansion surface 5132 as the origin, and β3≥0 means that the second guide section 53121 extends toward the upper left. In this way, the relative angle between the volute 531 and the expansion section 513 is ensured to be within 10°, so that while ensuring that the airflow can be smoothly guided from the fan chamber 511 in the volute 531 to the heat exchange channel 512, the noise pollution and air volume loss generated are also small.

[0089] Fig.11 The third structural diagram of the indoor unit 500 provided in the embodiment of the present application is shown. Fig.11 Optionally, the tangent of the first expansion surface 5131 is tangent to the first guide section 53111, and the extension surface of the second guide section 53121 is located on the second expansion surface 5132, that is, the relative angle between the first expansion surface 5131 and the first guide section 53111 and the relative angle between the second expansion surface 5132 and the second guide section 53121 are both zero. In this way, the first expansion surface 5131 becomes an extension of the first guide section 53111, and the second expansion surface 5132 becomes an extension of the second guide section 53121, so that the airflow can enter the heat exchange cavity from the fan cavity 511 more smoothly.

[0090] Fig.12 FIG. 1 shows one of the structural schematic diagrams of the heat exchange channel 512 provided in the embodiment of the present application, see FIG. Fig.12 In some embodiments of the present application, the heat exchange channel 512 further includes a tapered section 515, which is located on the side of the installation section 514 away from the expansion section 513, and the diameter of the tapered section 515 gradually decreases along the first direction.

[0091] It can be understood that the present application forms a contraction-type air duct downstream of the indoor heat exchanger 50, and the downstream of the contraction-type air duct is the air supply outlet 516 of the indoor unit 500. According to the Bernoulli equation, the total pressure in the heat exchange channel 512 is constant, and the total pressure includes static pressure and dynamic pressure. Since the heat exchange channel 512 gradually contracts in the tapered section 515, the static pressure is converted into dynamic pressure when the airflow flows through the tapered section 515, thereby increasing the wind speed and air supply distance of the airflow when it flows out of the air supply outlet 516.

[0092] Fig.13 The second structural diagram of the heat exchange channel 512 provided in the embodiment of the present application is shown in conjunction with Fig.12 and Fig.13 In some embodiments of the present application, the mounting section 514 includes a first mounting surface 5141 and a second mounting surface 5142 , the first mounting surface 5141 is connected to the first expansion surface, the second mounting surface 5142 is arranged opposite to the first mounting surface 5141 , and the second mounting surface 5142 is connected to the second expansion surface 5132 .

[0093] The tapered section 515 includes a first tapered surface 5151 and a second tapered surface 5152 . The first tapered surface 5151 is connected to the side of the first mounting surface 5141 away from the first expansion surface 5131 . The second tapered surface 5152 is arranged opposite to the first tapered surface 5151 and connected to the side of the second mounting surface 5142 away from the second expansion surface 5132 .

[0094] In this way, the first mounting surface 5141 and the second mounting surface 5142 are respectively abutted against the upper and lower ends of the indoor heat exchanger 50, the first expansion surface 5131, the first mounting surface 5141 and the first tapered surface 5151 constitute the lower edge surface of the heat exchange channel 512, the second expansion surface 5132, the second mounting surface 5142 and the second tapered surface 5152 constitute the upper edge surface of the heat exchange channel 512, and the airflow is smoothly guided along the upper edge surface and the lower edge surface to the indoor heat exchanger 50 located in the mounting section 514 for heat exchange, and the airflow after heat exchange is depressurized and accelerated by the tapered section 515 and then flows out from the air supply port 516.

[0095] It should be noted that the specific structures of the first tapered surface 5151 and the second tapered surface 5152 in the tapered section 515 can be set to the same structure as the first expansion surface 5131 and the second expansion surface 5132 in the expansion section 513, such as arc shape or plane shape.

[0096] Combined with reference Figure 6 and Fig.13 The indoor heat exchanger 50 also includes a second direction (ie, Fig.13The second direction is perpendicular to the first direction and parallel to the plane where the partition 52 is located. The second heat exchange part 502 is parallel to the plane where the partition 52 is located. A recessed part 5010 is formed on the windward side of each of the first heat exchange part 501 and the third heat exchange part 503.

[0097] Among them, the bottom wall surface 5011 of the recessed portion 5010 is located on the windward side away from the fan cavity 511, and the side wall surface 5012 of at least one recessed portion 5010 is used to guide part of the air entering the heat exchange channel 512 from the ventilation hole 521 to the corresponding bottom wall surface 5011.

[0098] It is understandable that, in the process of airflow entering the heat exchange channel 512 from the fan cavity 511, the windward surface of the indoor heat exchanger 50 in contact with the airflow can affect the heat exchange performance. When the windward surface is a plane, the contact area between the indoor heat exchanger 50 and the airflow is small in the limited space of the heat exchange channel 512, and the heat exchange efficiency is poor. When the windward surface 5021 is a curved surface, although the contact area with the airflow can be increased in the limited space of the heat exchange channel 512, the wind speed gradient of the airflow at different positions on the windward surface is greatly different.

[0099] In the technical solution of the present application, the first heat exchange part 501 is tilted on the first mounting surface 5141, the second heat exchange part 502 is parallel to the plane where the partition 52 is located, and the third heat exchange part 503 is tilted on the second mounting surface 5142. In this way, on the one hand, the overall windward surface of the indoor heat exchanger 50 in the present application is composed of a flat windward surface 5021 and a curved windward side (recessed part 5010), so that while ensuring that the indoor heat exchanger 50 has a large contact area with the airflow, the wind speed gradient at different positions on the surface of the indoor heat exchanger 50 can also be reduced, so that the heat exchange performance at various positions of the indoor heat exchanger 50 is relatively balanced.

[0100] In a possible structural design, the first heat exchange part 501 is inclined toward one side of the air supply port 516, that is, the first end 5013 of the first heat exchange part 501 is an end of the first heat exchange part 501 away from the first mounting surface 5141, the second end 5014 of the first heat exchange part 501 is an end where the first heat exchange part 501 is connected to the first mounting surface 5141, and the second end 5014 is located between the first end 5013 and the fan assembly 53.

[0101] The first heat exchange part 501 is tiltedly arranged on the first mounting surface 5141, and the angle α1 between the first heat exchange part 501 and the first mounting surface 5141 is smaller than the angle α2 between the first tapered surface 5151 and the extension surface of the first mounting surface 5141. Similarly, the third heat exchange part 503 is tiltedly arranged on the second mounting surface 5142, and the second tapered surface 5152 is arranged in the same manner as the first tapered surface 5151. The first tapered surface 5151 and the second tapered surface 5152 can be symmetrically arranged with the central axis of the heat exchange channel 512 as the symmetry axis, so that the wind speed and wind direction of the air flow at the air supply port 516 are relatively uniform.

[0102] It is understandable that the angle between the first tapered surface 5151 and the extension surface of the first mounting surface 5141 forms a contraction angle α2, and the greater the α2, the greater the resistance of the airflow when passing through the air outlet 516. In the indoor unit 500 using a W-shaped heat exchanger, since the first tapered surface 5151 of the lower edge of the heat exchange channel 512 is close to the first heat exchange part 501 of the indoor heat exchanger 50, it is stipulated that when the contraction angle α2 is the largest, the first tapered surface 5151 is parallel to the first heat exchange part 501 of the indoor heat exchanger 50 (i.e., α1=α2), so that the wind resistance is kept within a suitable range to avoid wind speed loss caused by large wind resistance.

[0103] In another possible structural design, the first heat exchange part 501 is inclined toward the side away from the air supply port 516, that is, the first end 5013 of the first heat exchange part 501 is the end of the first heat exchange part 501 away from the first mounting surface 5141, the second end 5014 of the first heat exchange part 501 is the end where the first heat exchange part 501 is connected to the first mounting surface 5141, and the first end 5013 is located between the second end 5014 and the fan assembly 53.

[0104] Fig.14 Shows Fig.13 Schematic diagram of the enlarged structure at position A, see Fig.14 In some embodiments of the present application, the first mounting surface 5141 includes a connecting portion 51411 and a drainage groove 51410. The connecting portion 51411 is connected to the first heat exchange portion 501 of the indoor heat exchanger 50. The drainage groove 51410 may include a first drainage groove 51412 and a second drainage groove 51413 arranged on opposite sides of the connecting portion 51411, or may be the first drainage groove 51412 or the second drainage groove 51413 arranged only on one side of the connecting portion 51411.

[0105] In this way, the condensed water generated by the indoor heat exchanger 50 during operation can slide along the outer surface of the first heat exchange part 501 into the drainage groove of the first mounting surface 5141, so that water is not easily accumulated in the heat exchange channel 512. The heat exchange channel 512 can remain dry, reducing the risk of rust and corrosion of the heat exchange channel 512, thereby reducing the risk of water leakage in the indoor unit 500 and improving the reliability of the indoor unit 500 product.

[0106] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A duct type air conditioner, comprising an indoor unit, characterized in that: The indoor unit comprises: A housing having a receiving space defined therein; a partition plate, arranged in the shell, and dividing the accommodating space into a fan cavity and a heat exchange channel, the partition plate being provided with a ventilation hole connecting the fan cavity and the heat exchange channel; An indoor heat exchanger is arranged in the heat exchange channel; A fan assembly, disposed in the fan cavity, for introducing the air in the fan cavity into the heat exchange channel through the ventilation hole; The heat exchange channel comprises: an installation section, on which the indoor heat exchanger is arranged; An expansion section is arranged between the mounting section and the partition, and opposite sides of the expansion section are respectively connected to the partition and the mounting section. The diameter of the expansion section gradually increases along a first direction, and the first direction is the direction from the fan assembly to the indoor heat exchanger.

2. A duct type air conditioner according to claim 1, characterized in that: The fan assembly comprises: impeller; An upper volute and a lower volute, wherein the upper volute and the lower volute together form a fan chamber, wherein the impeller is disposed in the fan chamber, wherein the lower volute comprises: a first guide section disposed at the ventilation hole and connected to the partition; and the upper volute comprises: a second guide section disposed at the ventilation hole; The expansion section comprises: A first expansion surface, wherein opposite sides of the first expansion surface are respectively connected to the first guide section and the installation section; The second expansion surface is arranged opposite to the first expansion surface, and opposite sides of the second expansion surface are respectively connected to the second guide section and the installation section.

3. A duct type air conditioner according to claim 2, characterized in that: The first expansion surface is an arc surface, and the center of the arc surface is located on a side of the arc surface away from the indoor heat exchanger.

4. A duct type air conditioner according to claim 3, characterized in that: The included angle between the first guide section and the tangent line of the first expansion surface is less than or equal to 10°; An angle formed by the second guide section and the second expansion surface is less than 10°.

5. A duct type air conditioner according to claim 4, characterized in that: The tangent line of the first expansion surface is tangent to the first guide section; and the extension surface of the second guide section is located on the second expansion surface.

6. A duct type air conditioner according to any one of claims 2 to 5, characterized in that: The heat exchange channel also includes: The tapered section is located on a side of the installation section away from the expansion section, and the diameter of the tapered section gradually decreases along the first direction.

7. A duct type air conditioner according to claim 6, characterized in that: The installation section comprises: a first mounting surface, the first mounting surface being connected to the first expansion surface; a second mounting surface, arranged opposite to the first mounting surface, and the second mounting surface is connected to the second expansion surface; The tapered section comprises: A first tapered surface connected to a side of the first mounting surface away from the first expansion surface; The second tapered surface is arranged opposite to the first tapered surface and connected to a side of the second mounting surface away from the second expansion surface.

8. The duct type air conditioner according to claim 7, characterized in that: The indoor heat exchanger comprises: a first heat exchange portion, the first heat exchange portion being obliquely arranged on the first mounting surface; a second heat exchange portion, wherein a windward surface of the second heat exchange portion is parallel to the plane where the partition plate is located; and a third heat exchange portion, the third heat exchange portion being obliquely disposed on the second mounting surface; A concave portion is formed on the windward side of each of the first heat exchange portion and the third heat exchange portion, and a bottom wall surface of the concave portion is located on a side of the windward surface away from the fan cavity; At least one of the side walls of the recessed portion close to the windward surface is used to guide part of the air entering the heat exchange channel from the ventilation hole to the corresponding bottom wall surface; The included angle between the first heat exchange portion and the first mounting surface is smaller than the included angle between the first tapered surface and the extended surface of the first mounting surface; An included angle between the third heat exchange portion and the second mounting surface is smaller than an included angle between the second tapered surface and an extended surface of the second mounting surface.

9. The duct type air conditioner according to claim 7, characterized in that: The first mounting surface comprises: a connecting portion, the connecting portion being connected to the indoor heat exchanger, The drainage groove comprises a first drainage groove and a second drainage groove arranged on the opposite sides.

10. A duct type air conditioner, comprising an indoor unit, characterized in that: The indoor unit comprises: A housing having a receiving space defined therein; A partition plate, used to separate the accommodating space into a fan cavity and a heat exchange channel, and the partition plate is provided with a ventilation hole connecting the fan cavity and the heat exchange channel; An indoor heat exchanger is arranged in the heat exchange channel; A fan assembly, used for introducing the air in the fan cavity into the heat exchange channel through the ventilation hole; The heat exchange channel comprises: an installation section, on which the indoor heat exchanger is arranged; An expansion section, wherein opposite sides of the expansion section are respectively connected to the partition plate and the mounting section, and the diameter of the expansion section gradually increases along a first direction, wherein the first direction is a direction from the fan assembly to the indoor heat exchanger.

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