Wall-mounted air conditioner indoor unit

Abstract

The present invention provides a wall-mounted air conditioner indoor unit, which comprises: a shell, the shell comprises a cover shell and a front panel arranged in front of the cover shell, an air inlet is provided on the top wall of the cover shell, and an oblong air supply port is provided on the lower part of the front panel; a heat exchanger; an injection assembly, which is arranged in the air supply port, and comprises a first injection part and a second injection part arranged transversely, and the first injection port and the second injection port are respectively formed on the inner peripheral wall of the first injection part and the second injection part, respectively used to eject the airflow in the injection part forward, and drive the ambient air in the air extraction hole defined by the inner peripheral wall of the injection part to be sent forward; a first air supply assembly, which is used to generate a first heat exchange airflow entering from the air inlet, exchanging heat with the heat exchanger and then being supplied to the first injection part, and a second air supply assembly, which is used to generate a second heat exchange airflow entering from the air inlet, exchanging heat with the heat exchanger and then being supplied to the second injection part. This scheme increases the air supply volume, so that the overall indoor temperature is uniformly reduced.

Description

Technical Field

[0001] The invention relates to an air conditioner, in particular to an indoor unit of a wall-mounted air conditioner. Background Art

[0002] Air conditioner is one of the essential household appliances. As users have higher and higher requirements for comfort and health, the traditional air supply method of air conditioner is to send cold air into the room, and then slowly convect with the surrounding air. The heat exchange rate is slow and it cannot give people a quick cool feeling. Blowing the air outlet of the indoor unit directly at people will have an adverse effect on the user's health and easily cause air-conditioning disease.

[0003] To address this problem, there are indoor units with jet outlets for gentle air supply in the prior art. They use smaller outlets to drive the surrounding air to blow out, so that the air after heat exchange is mixed with the surrounding air and then delivered. However, the jet outlets have high structural requirements, so they are mostly used in cabinet-type indoor units with ample space. In order to meet the structural requirements of the jet outlets, the hanging indoor units with jet outlets often need to set the casing to a circular or other irregular shape. On the one hand, there is a gap with the user's usage habits and the existing cognition of hanging indoor units, and it is not easy to be accepted by users; on the other hand, it also brings trouble to the installation of hanging indoor units. Therefore, hanging indoor units with jet outlets cannot meet the user's usage requirements. Summary of the invention

[0004] An object of the present invention is to provide a wall-mounted air conditioner indoor unit with gentle air supply and fast heat exchange rate.

[0005] A further object of the present invention is to make the structure of the indoor unit of the wall-mounted air conditioner compact and in line with the user's usage habits.

[0006] Another further object of the present invention is to make the air supply mode of the indoor unit of the wall-mounted air conditioner flexible to meet the adjustment requirements of different requirements.

[0007] In particular, the present invention provides a wall-mounted air conditioner indoor unit, comprising:

[0008] The housing comprises a cover shell and a front panel arranged in front of the cover shell, an air inlet is provided on the top wall of the cover shell, and an oblong air outlet is provided at the lower part of the front panel;

[0009] A heat exchanger is arranged inside the shell;

[0010] The jet assembly is arranged in the air supply port, and includes a first jet part and a second jet part arranged transversely, and the first jet port and the second jet port are respectively formed on the inner peripheral walls of the first jet part and the second jet part, the first jet port is used to jet the airflow in the first jet part forward, and drive the ambient air in the first air suction hole defined by the inner peripheral wall of the first jet part to be sent forward, and the second jet port is used to jet the airflow in the second jet part forward, and drive the ambient air in the second air suction hole defined by the inner peripheral wall of the second jet part to be sent forward, and the first air suction hole and the second air suction hole are respectively connected to the surrounding environment upstream in the air supply direction;

[0011] The first air supply component and the second air supply component are arranged laterally at intervals inside the shell, wherein the first air supply component is used to generate a first heat exchange airflow that enters from the air inlet on the top wall of the cover and is supplied to the first jet part after heat exchange with the heat exchanger, and the second air supply component is used to generate a second heat exchange airflow that enters from the air inlet on the top wall of the cover and is supplied to the second jet part after heat exchange with the heat exchanger.

[0012] Optionally, the indoor unit of the wall-mounted air conditioner further comprises a partition, the partition comprising a longitudinal plate portion arranged parallel to the front panel, the middle portion of the longitudinal plate portion is recessed backwards to define a heat exchanger accommodating cavity for arranging the heat exchanger between the partition and the front panel; and

[0013] The air inlet is formed by an air inlet grille arranged on the top of the shell. The partition also includes a transverse plate portion connected to the top of the longitudinal plate portion and spaced from the top of the shell. The transverse plate portion defines an air inlet channel from the air inlet to the heat exchanger accommodating chamber.

[0014] Optionally, a first through hole and a second through hole are arranged in a transverse interval in the middle of the longitudinal plate portion.

[0015] The first air supply assembly includes: a first centrifugal fan, an impeller and a volute of the first centrifugal fan are arranged in a space defined by the longitudinal plate portion and the housing, and an air collecting port of the first centrifugal fan passes through the first through hole to inhale air from the heat exchanger accommodating chamber to form a first heat exchange airflow;

[0016] The second air supply assembly includes: a second centrifugal fan, the impeller and volute of the first centrifugal fan are also arranged in the space defined by the longitudinal plate and the cover shell, and the air collecting port of the second centrifugal fan passes through the second through hole to inhale air from the heat exchanger accommodating chamber to form a second heat exchange airflow.

[0017] Optionally, the first jet part and the second jet part are respectively composed of an annular inner wall and an annular outer wall, and

[0018] The annular outer wall and the annular inner wall of the first jet part jointly define a first air supply cavity, the edge where the annular outer wall and the annular inner wall of the first jet part meet forms a first jet port, and the end of the first jet part away from the second jet part is provided with a first air inlet connected to the first air supply assembly, so as to introduce the first heat exchange airflow into the first air supply cavity;

[0019] The annular outer wall and the annular inner wall of the second jet part jointly define a second air supply cavity, the edge where the annular outer wall and the annular inner wall of the second jet part meet forms a second jet port, and the end of the second jet part away from the side of the first jet part is provided with a second air inlet connected to the second air supply assembly, thereby introducing the second heat exchange airflow into the second air supply cavity.

[0020] Optionally, the rear edge of the annular inner wall of the first air jet portion is recessed into the first air supply cavity, and the annular outer wall of the first air jet portion has an outward flange at a position opposite to the rear edge of the annular inner wall, so that the gap between the annular outer wall of the first air jet portion and the rear edge of the annular inner wall forms a first air jet port;

[0021] The rear edge of the annular inner wall of the second jet portion is recessed into the second air supply cavity, and the annular outer wall of the second jet portion has an outward flange at a position relative to the rear edge of the annular inner wall, so that the gap between the annular outer wall of the second jet portion and the rear edge of the annular inner wall forms a second jet port.

[0022] Optionally, the annular inner wall of the first jet portion extends forward from its rear edge to form a first Coanda surface that continuously expands outward; and the cross-section of the annular outer wall of the first jet portion located at the rear side of the jet assembly is spiral, so that the airflow of the first air supply cavity is ejected from the first jet port along the annular outer wall of the first jet portion, and then sent forward along the first Coanda surface, and drives the ambient air in the first exhaust hole to be extracted; and

[0023] The annular inner wall of the second jet portion extends forward from its rear edge to form a second Coanda surface that continuously expands outward; and the cross-section of the annular outer wall of the second jet portion located on the rear side of the jet assembly is spiral, so that the airflow of the second air supply cavity is ejected from the second jet port along the annular outer wall of the second jet portion, and then sent forward along the second Coanda surface, driving the ambient air in the second exhaust hole to be extracted.

[0024] Optionally, the exhaust port of the volute of the first centrifugal fan faces the side wall of the housing on the side of the first air inlet, and the first air supply assembly further includes: a first air guide component, the first air guide component is connected between the exhaust port of the first centrifugal fan and the first air inlet to guide the airflow discharged by the first centrifugal fan into the first air supply cavity;

[0025] The exhaust port of the volute of the second centrifugal fan faces the side wall of the shell on the side of the second air inlet, and the second air supply assembly includes: a second air guide component, which is connected between the exhaust port of the second centrifugal fan and the second air inlet to guide the airflow exhausted by the second centrifugal fan into the second air supply chamber.

[0026] Optionally, the first air guide component includes: a first guide section, which has an air inlet of the first air guide component, connected to the exhaust port of the volute of the first centrifugal fan, and at least a part of the first guide section is spiral, which guides the airflow discharged by the first centrifugal fan downward; a first air supply section, which is connected to the first guide section, and defines a first air collecting cavity inside to receive the airflow discharged by the first centrifugal fan, and the first air supply section has a first exhaust port connected to the first air inlet, so that the airflow of the first air collecting cavity is supplied to the first air supply cavity; and

[0027] The second air guide component includes: a second guide section, which has an air inlet of the second air guide component, connected to the exhaust port of the volute of the second centrifugal fan, and at least a part of the second guide section is spiral, guiding the airflow discharged by the second centrifugal fan to be directed downward; a second air supply section, which is connected to the second guide section and defines a second air collecting chamber inside to receive the airflow discharged by the second centrifugal fan. The second air supply section has a second exhaust port connected to the second air inlet, so that the airflow in the second air collecting chamber is supplied to the second air supply chamber.

[0028] Optionally, the first guide section gradually contracts from the air inlet of the first air guide component along the airflow direction, and the first air supply section forms a volute shape along the air outlet direction of the first guide section, so as to reduce the wind resistance of the first heat exchange airflow in the first air collecting cavity;

[0029] The second guide section gradually shrinks from the air inlet of the second air guide component along the air flow direction, and the second air supply section forms a volute shape along the air outlet direction of the second guide section, reducing the wind resistance of the second heat exchange airflow in the second air collecting cavity.

[0030] Optionally, the cover shell and the lower part of the front panel form an air supply port that penetrates front to back, and the position where the air supply port is formed on the rear side of the cover shell is recessed forward, so that there is an air circulation area behind the air supply port.

[0031] The wall-mounted air conditioner indoor unit of the present invention has an oblong air supply port below the shell for arranging a ring-shaped jet component, and the jet component includes two independently arranged first jet parts and second jet parts, and the first air supply component and the second air supply component respectively supply the airflow that has undergone heat exchange in the heat exchanger, so that the airflow after heat exchange is ejected from the jet ports of the first jet part and the second jet part, sucking in the ambient air around the air supply port and mixing with the heat exchange airflow with a drastic temperature difference from the ambient environment, thereby ensuring that the delivered airflow is soft and feels more comfortable when blowing on the human body. On the one hand, the air supply volume is increased, the flow of indoor air is accelerated, and the overall indoor temperature can be uniformly reduced. Moreover, the air outlet of the wall-mounted air conditioner indoor unit of the present invention is in the shape of an oblong runway and is arranged below the shell. The overall structure is similar to the existing traditional wall-mounted indoor unit, which is easily accepted by users, and is easy to replace the existing traditional wall-mounted indoor unit, with a flexible installation position.

[0032] Furthermore, in the wall-mounted air conditioner indoor unit of the present invention, the air inlet is arranged on the top wall of the cover shell, which is outside the user's visual range, thereby ensuring the integrity of the appearance, and a partition is used to form an air inlet channel from the air inlet to the heat exchanger accommodating cavity, thereby ensuring smooth heat exchange airflow.

[0033] Furthermore, the wall-mounted indoor unit of the present invention has two air supply components, which respectively provide airflow after heat exchange to the two jet parts of the jet component, and finally eject the air from the jet port. The two air supply components cooperate with each other to supply air together, and can be independently controlled according to the working conditions. For example, it is possible to choose to supply air at the same air volume at the same time; to supply air at different air volumes respectively; or to start air supply at one of them, so that the air output of the indoor unit meets the requirements of these different working conditions. The control is more flexible and meets the different requirements of users.

[0034] Furthermore, the wall-mounted air conditioner indoor unit of the present invention has compact internal components, fully utilizing the space in the housing, and can make the wall-mounted air conditioner indoor unit thinner.

[0035] Furthermore, the wall-mounted air conditioner indoor unit of the present invention has improved the positions and structures of components such as the heat exchanger, the centrifugal fan, and the air guide component, which on the one hand reduces the occupied space and on the other hand can also reduce the air supply resistance.

[0036] 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

[0037] 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:

[0038] Figure 1 is a schematic appearance diagram of a wall-mounted air conditioner indoor unit according to an embodiment of the present invention;

[0039] Figure 2 is a schematic exploded view of an indoor unit of a wall-mounted air conditioner according to an embodiment of the present invention;

[0040] Figure 3 is a schematic diagram of an air injection assembly in an indoor unit of a wall-mounted air conditioner according to an embodiment of the present invention;

[0041] Figure 4 yes Figure 3 A front view of a first jet portion of the jet assembly shown;

[0042] Figure 5 is along Figure 4 A schematic cross-sectional airflow diagram taken along the cutting line AA in FIG.

[0043] Figure 6 is a schematic diagram of internal components in an indoor unit of a wall-mounted air conditioner according to an embodiment of the present invention; and

[0044] Figure 7 The invention is a schematic structural diagram of a first air supply component and a second air supply component in a wall-mounted air conditioner indoor unit supplying air to an injection component according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The present embodiment provides a wall-mounted air conditioner indoor unit 100. For the convenience of description, the directions such as "up", "down", "front", "back", "top" and "bottom" mentioned in the specification are defined according to the spatial position relationship of the wall-mounted air conditioner indoor unit 100 under normal working conditions. For example, the side of the wall-mounted air conditioner indoor unit 100 facing the user is the front, and the side close to the installation position is the back.

[0046] Figure 1 is a schematic appearance diagram of a wall-mounted air conditioner indoor unit 100 according to an embodiment of the present invention, and Figure 21 is a schematic exploded diagram of a wall-mounted air conditioner indoor unit 100 according to an embodiment of the present invention. The wall-mounted air conditioner indoor unit 100 may generally include: a housing 110, an injection assembly 120, a heat exchanger 140, a first air supply assembly, and a second air supply assembly. The housing 110 may include: a housing 112 and a front panel 114 arranged in front of the housing 112. The housing 112 is formed by a top wall, a side wall, and a back, and these components together define a space for accommodating internal components. The front panel 114 is arranged in front of the housing 112, thereby closing the internal space of the housing 112. An air inlet 116 and an air supply 117 are provided on the housing 110. The air supply 117 is arranged in an oblong shape at the lower part of the housing 110, and is connected to the surrounding environment upstream in the air supply direction. The air inlet 116 is arranged on the top wall of the housing 112, and the air inlet 116 can be formed by a grille, a mesh, etc. Users generally cannot see the position of the air inlet 116, so the integrity of the appearance can be ensured.

[0047] In some preferred embodiments, the air supply port 117 can be provided in the lower part of the housing 110 through the front and back (the corresponding positions of the cover 112 and the front panel 114 are provided with oblong through holes, thereby forming the air supply port 117 that passes through the front and back. The position where the air supply port 117 is formed on the rear side of the cover 112 is recessed forward, so that there is an air circulation area 118 behind the air supply port 117, so that the inside of the air supply port 117 is connected with the air circulation area 118, and the heat exchange gas ejected by the jet assembly 120 can draw ambient air from the air circulation area 118 for mixing. The mixed airflow has a small temperature difference with the surrounding environment, is softer, and has a larger air supply volume, thereby accelerating the flow of indoor air.

[0048] In addition, the jet assembly 120 can also be arranged at a front position at the lower part of the shell 110. The shell 110 has a hollow area connected to the surrounding environment at the rear of the jet assembly 120, that is, upstream in the air supply direction, so that the heat exchange gas ejected by the jet assembly 120 can draw ambient air through the hollow area for mixing.

[0049] The heat exchanger 140 is arranged inside the shell 110. The heat exchanger 140 exchanges heat with the air flowing through it to change the temperature of the air flowing through it. The heat exchanger 140 is a part of the refrigeration system, and the refrigeration system can be implemented by using a compression refrigeration cycle. The compression refrigeration cycle uses the compression phase change cycle of the refrigerant in the compressor, condenser, evaporator, and throttling device to achieve heat transfer. The refrigeration system can also be provided with a four-way valve to change the flow direction of the refrigerant so that the indoor unit heat exchanger 140 alternately acts as an evaporator or condenser to achieve a cooling or heating function. Since the compression refrigeration cycle in the air conditioner is well known to those skilled in the art, its working principle and structure are not described in detail here. The heat exchanger 140 can be arranged close to the front panel 114 of the shell 110.

[0050] The jet assembly 120 is arranged in the air supply port 117. The jet assembly 120 has two transversely arranged first jet parts 128 and second jet parts 129. The first jet part 128 and the second jet part 129 are both in an oblong ring shape (or a runway shape) as a whole. They can be symmetrically arranged relative to the center of the jet assembly 120. The first jet part 128 has a first air extraction hole 1282 in the center, and the second jet part 129 has a second air extraction hole 1292 in the center. The first air extraction hole 1282 and the second air extraction hole 1292 are respectively connected to the surrounding environment upstream in the air supply direction.

[0051] A first jet port 124 and a second jet port (not marked in the figure) are respectively formed on the inner circumferential walls of the first jet portion 128 and the second jet portion 129. The first jet port 124 is used to eject the airflow in the first jet portion 128 forward, and drive the ambient air in the first exhaust hole 1282 defined by the inner circumferential wall of the first jet portion 128 to be sent forward. The second jet port is used to eject the airflow in the second jet portion 129 forward, and drive the ambient air in the second exhaust hole 1292 defined by the inner circumferential wall of the second jet portion 129 to be sent forward.

[0052] The first jet portion 128 and the second jet portion 129 can be respectively composed of their own annular inner wall and annular outer wall, and the annular outer wall and the annular inner wall of the first jet portion 128 jointly define a first air supply chamber 125, and the edge where the annular outer wall and the annular inner wall of the first jet portion 128 meet forms a first jet port 124, and the end of the first jet portion 128 on the side away from the second jet portion 129 is provided with a first air inlet 1281 connected to the first air supply assembly, thereby introducing the first heat exchange airflow into the first air supply chamber 125.

[0053] The second jet portion 129 has the same structure as the first jet portion 128 and is symmetrically arranged, so that the annular outer wall and the annular inner wall of the second jet portion 129 jointly define a second air supply cavity (not marked in the figure), and the edge where the annular outer wall and the annular inner wall of the second jet portion 129 meet forms a second jet port (not marked in the figure), and the end of the second jet portion 129 away from the side of the first jet portion 128 is provided with a second air inlet 1291 connected to the second air supply assembly, thereby introducing the second heat exchange airflow into the second air supply cavity.

[0054] Since the second jet part 129 has the same structure as the first jet part 128, the structure of the first jet part 128 is described below in conjunction with the accompanying drawings. The size and specification of the first jet part 128 and its internal components can be set according to the air supply capacity of the first air supply assembly. Figure 3 1 is a schematic diagram of an air injection assembly 120 in a wall-mounted air conditioner indoor unit 100 according to an embodiment of the present invention. Figure 4 yes Figure 3A front view of the first jet portion 128 in the jet assembly 120 is shown. Figure 5 is along Figure 4 The schematic cross-sectional view of the airflow direction diagram taken along the section line AA in FIG. The first jet portion 128 includes an annular inner wall 121 and an annular outer wall 122, which together form the above-mentioned oblong shape, and the inner side of the annular inner wall 121 is a first air extraction hole 1282. The edge where the annular outer wall 122 meets the annular inner wall 121 forms a first jet port 124, which is used to eject the airflow of the first air supply cavity 125 forward and to draw the air behind the air supply port 117 through the air supply port 117.

[0055] The rear edge 126 of the annular inner wall 121 is recessed into the first air supply cavity 125, and the position where the annular outer wall 122 is opposite to the rear edge 126 of the annular inner wall 121 has an outward flange 127, so that the gap between the annular outer wall 122 and the rear edge 126 of the annular inner wall 121 forms the first air jet 124. The rear edge 126 of the annular inner wall 121 recessed into the first air supply cavity 125 can also guide the airflow direction, so that the airflow in the first air supply cavity 125 is smoothly sent out from the first air jet 124.

[0056] The annular inner wall 121 extends forward from its rear edge 126 to form a Coanda surface that continuously expands outward; and the cross section of the portion of the annular outer wall 122 located at the rear side of the jet assembly 120 is spiral, so that the airflow of the first air supply cavity 125 is ejected from the first jet port 124 along the annular outer wall 122, and then sent forward along the first Coanda surface formed by the annular inner wall 121, and drives the ambient air behind the air supply port 117 to be extracted. The expansion inclination angle of the annular inner wall 121 extending forward and continuously expanding outward can be 5 to 15 degrees. The larger the inclination angle, the faster the expansion speed of the airflow ejected from the jet port 124. After a large number of tests, the expansion inclination angle of the annular inner wall 121 can be set to between 6 and 10 degrees, which is more conducive to mixing with the ambient air in the first air extraction hole 1282.

[0057] The annular inner wall 121 and the annular outer wall 122 jointly define an annular first air supply cavity 125 inside the first jet portion 128, and a first air inlet 1281 is provided at one lateral end of the annular outer wall 122 (the end away from the second jet portion 128) for providing the first air supply cavity 125 with an airflow after heat exchange by the heat exchanger 140.

[0058] In some optional embodiments, the first jet portion 128 can be shaped as a whole, and the annular inner wall 121 and the annular outer wall 122 respectively have two spaced horizontal sections and two arc sections connecting the two horizontal sections, wherein the first air inlet 1281 of the first jet portion 128 is provided on the annular outer wall 122 of a section of the two arc sections away from the second jet portion 128, for receiving the airflow after heat exchange provided by the first air supply assembly.

[0059] The above sections of the annular inner wall 121 and the annular outer wall 122 may be formed by splicing a plurality of connected components. In some preferred embodiments, the annular inner wall 121 and the annular outer wall 122 may also be formed by an integral molded part.

[0060] The first jet port 124 may be a continuous annular groove. In some optional embodiments, the first jet port 124 may also be formed on a portion of the annular inner wall 121 and the annular outer wall 122, or may be a plurality of spaced segments. For example, the first jet port 124 may be provided only on the horizontal section, so that the jet is more uniform, and the ambient air in the first exhaust hole 1282 may be effectively driven. In order to increase the jet velocity of the first jet port 124, the width of the first jet port 124 may be set to 1 to 3 mm. After a large number of tests, the width of the first jet port 124 may preferably be set to about 2 mm. The first jet port 124 of this width not only ensures the jet velocity of the heat exchange airflow, but also minimizes the wind resistance loss of the heat exchange airflow and reduces noise. Figure 5 The solid arrows represent the airflow direction of the ambient air, and the dashed arrows represent the airflow direction of the heat exchange airflow ejected from the air jet 124 .

[0061] The second jet part 129 has the same structure as the first jet part 128. The rear edge of the annular inner wall of the second jet part 129 is recessed into the second air supply cavity, and the annular outer wall of the second jet part 129 has an outward flange at a position opposite to the rear edge of the annular inner wall, so that the gap between the annular outer wall of the second jet part 129 and the rear edge of the annular inner wall forms a second jet port. The annular inner wall of the second jet part 129 extends forward from its rear edge to form a second Coanda surface that continuously expands outward; and the cross section of the annular outer wall of the second jet part 129 located at the rear side of the jet assembly 120 is spiral, so that the airflow of the second air supply cavity is ejected from the second jet port along the annular outer wall of the second jet part 129, and then sent forward along the second Coanda surface, and drives the ambient air in the second air extraction hole 1292 to be extracted. A second air inlet 1291 for providing the second air supply cavity with the airflow after heat exchange by the heat exchanger 140 is provided at one lateral end (the end away from the first air injection portion 128 ) of the annular outer wall of the second air injection portion 129 .

[0062] Other structural details of the second jet part 129 can be derived from the description of the first jet part 128 , and are not repeated here.

[0063] In some preferred embodiments, the jet assembly 120 can also be driven by a motor and a transmission mechanism to achieve overall up and down swinging, adjust the air supply angle, and achieve swinging air supply, thereby making the air output range wider.

[0064] The first air supply component and the second air supply component are arranged laterally at intervals inside the shell 110, wherein the first air supply component is used to generate a first heat exchange airflow that enters from the air inlet 116 on the top wall of the cover 112, exchanges heat with the heat exchanger 140, and is supplied to the first air supply cavity 125 of the first jet part 128 through the first air inlet 1281; the second air supply component is used to generate a second heat exchange airflow that enters from the air inlet 116 on the top wall of the cover 112, exchanges heat with the heat exchanger 140, and is supplied to the second air supply cavity 129 of the second jet part 129 through the second air inlet 1291.

[0065] The first air supply assembly and the second air supply assembly are symmetrically arranged around the center of the heat exchanger 140 , and the first air supply assembly and the second air supply assembly supply air to the first air inlet 1281 and the second air inlet 1291 on both sides of the jet assembly 120 , respectively.

[0066] The first air supply assembly may include: a first centrifugal fan 131 and a first air guide component 136. The first centrifugal fan 131, as a power source for the flow of the first heat exchange airflow, may be configured so that ambient air enters from the air inlet 116 and exchanges heat with the heat exchanger 140, is discharged downstream of the airflow after passing through the first centrifugal fan 131, and is finally sent out of the indoor unit 100 through the jet assembly 120. The first air guide component 136 is connected between the exhaust port of the first centrifugal fan 131 and the first air inlet 1281, and is used to guide the airflow discharged from the first centrifugal fan 131 into the first air supply chamber 125.

[0067] The second air supply assembly may include: a second centrifugal fan 151 and a second air guide component 156. The second centrifugal fan 151, as a power source for the flow of the second heat exchange airflow, may be configured so that ambient air enters from the air inlet 116 and exchanges heat with the heat exchanger 140, is discharged downstream of the airflow after passing through the second centrifugal fan 151, and is finally sent out of the indoor unit 100 through the second jet portion 129. The second air guide component 156 is connected between the exhaust port of the second centrifugal fan 151 and the second air inlet 1291, and is used to guide the airflow discharged from the second centrifugal fan 151 into the second air supply cavity.

[0068] Figure 61 is a schematic diagram of the internal components of the wall-mounted air conditioner indoor unit 100 according to an embodiment of the present invention. The interior of the wall-mounted air conditioner indoor unit 100 includes a partition 143, and the partition 143 is used to isolate the airflow before and after the heat exchange. The partition 143 includes a longitudinal plate portion 1431 arranged parallel to the front panel 114, and the middle portion of the longitudinal plate portion 1431 is recessed backward to define a heat exchanger accommodating chamber 144 for arranging the heat exchanger 140 between the longitudinal plate portion 1431 and the front panel 114. The heat exchanger 140 is arranged in the heat exchanger accommodating chamber 144.

[0069] The partition plate 143 further includes a transverse plate portion 1432 connected to the top of the longitudinal plate portion 1431 and spaced from the top of the housing 112, and the transverse plate portion 1432 defines an air inlet passage from the air inlet 116 to the heat exchanger accommodating chamber 144. After entering from the air inlet 116, the external air moves forward along the transverse plate portion 1432 into the heat exchanger accommodating chamber 144 to exchange heat with the heat exchanger 140.

[0070] A first through hole 145 and a second through hole 146 are provided at the center of the longitudinal plate portion 1431. The first through hole 145 allows the first air collecting port 132 of the first centrifugal fan 131 to pass through, and the second through hole 146 allows the second air collecting port 152 of the second centrifugal fan 151 to pass through. The impeller 133 and the volute 134 of the first centrifugal fan 131 are provided in the space defined by the longitudinal plate portion 1431 and the casing 112, and the air collecting port 132 of the first centrifugal fan 131 passes through the first through hole 145 to inhale air from the heat exchanger accommodating chamber 144 to form a first heat exchange airflow; the impeller 153 and the volute 154 of the second centrifugal fan 151 are provided in the space defined by the longitudinal plate portion 1431 and the casing 112, and the air collecting port 152 of the second centrifugal fan 151 passes through the second through hole 146 to inhale air from the heat exchanger accommodating chamber 144 to form a first heat exchange airflow.

[0071] The first centrifugal fan 131 and the second centrifugal fan 151 inhale the air in the heat exchanger accommodating chamber 144 that exchanges heat with the heat exchanger 140, thereby forming a first heat exchange airflow and a second heat exchange airflow, respectively. The exhaust port of the first volute 134 of the first centrifugal fan 131 faces the side wall of the housing 110; the air inlet of the first air guide component 136 is connected to the exhaust port of the first volute 134. Similarly, the exhaust port of the second volute 154 of the second centrifugal fan 151 faces the other side wall of the housing 110; the air inlet of the second air guide component 156 is connected to the exhaust port of the second volute 154.

[0072] Figure 7The first air supply component and the second air supply component in the indoor unit 100 of the wall-mounted air conditioner according to an embodiment of the present invention supply air to the jet component 120. The first air supply component includes: a first centrifugal fan 131 and a first air guide component 136, and the second air supply component includes: a second centrifugal fan 151 and a second air guide component 156. In order to ensure the air jet speed, the first air supply component and the second air supply component of this embodiment both use centrifugal fans as the power source of the heat exchange airflow. The first air guide component 136 is connected between the exhaust port of the first centrifugal fan 131 and the first air inlet 1281 to guide the airflow discharged by the first centrifugal fan 131 into the first air supply chamber 125. The second air guide component 136 is connected between the exhaust port of the second centrifugal fan 151 and the second air inlet 1291 to guide the airflow discharged by the second centrifugal fan 131 into the second air supply chamber.

[0073] The first centrifugal fan 131 uses the first impeller 133 rotating at high speed to accelerate the gas according to the principle of converting kinetic energy into potential energy, and then decelerates and changes the flow direction to convert the kinetic energy into potential energy. The first centrifugal fan 131 generally includes a first air collecting port 132, a first impeller 133, and a first volute 134. The function of the first air collecting port 132 of the first centrifugal fan 131 is to ensure that the airflow can evenly fill the inlet interface of the first impeller 133 and reduce flow losses. In this embodiment, the first air collecting port 132 of the first centrifugal fan 131 gradually shrinks toward the direction of the first impeller 133 to form a bell mouth, so that the air in the heat exchanger accommodating chamber 144 that exchanges heat with the heat exchanger 140 can be sucked into the first impeller 133 as much as possible. When the first impeller 133 of the first centrifugal fan 131 is driven by the first high-speed motor 135 to rotate with the shaft, the gas between the first impeller 133 obtains centrifugal force as the first impeller 133 rotates, and the gas is thrown out of the first impeller 133 and enters the first volute 134. The gas pressure in the first volute 134 increases and is directed to be discharged. After the gas between the blades is discharged, negative pressure is formed; the air of the heat exchanger 140 in the heat exchanger accommodating chamber 144 outside the first air collecting port 132 is continuously sucked in, thereby forming a continuous airflow.

[0074] The first impeller 133 and the first volute 134 of the first centrifugal fan 131 are arranged in a space defined by the longitudinal plate portion 1431 and the housing 112, and the exhaust port of the first volute 134 faces the side wall of the housing 110; the air inlet of the first air guide member 136 is connected to the exhaust port of the first volute 134. The first volute 134 is spiral-shaped, and absorbs the air thrown out from the first impeller 133, and converts the dynamic pressure of the airflow into static pressure through the gradually widening cross-sectional area.

[0075] The first air guide member 136 is connected between the exhaust port of the first centrifugal fan 131 and the first air inlet 1281 and is used to guide the airflow exhausted by the first centrifugal fan 131 into the first air supply cavity 125. The first air guide member 136 may include a first guide section 137 and a first air supply section 138.

[0076] The first guide section 137 has an air inlet of the first wind guide component 136, and at least a portion of the first guide section 137 is spirally shaped, which guides the airflow discharged from the first centrifugal fan 131 downward. The first guide section 137 gradually shrinks along the airflow direction from the air inlet of the first wind guide component 136, thereby accelerating the wind speed of the airflow entering the first air collecting cavity 139 of the first air supply section 138.

[0077] The first air supply section 138 is connected to the first flow guide section 137, and defines a first air collecting chamber 139 therein to receive the airflow discharged from the first centrifugal fan 131. The first air supply section 138 is provided with a first air inlet 1281 to supply the airflow from the first air collecting chamber 139 to the first air supply chamber 125. The first air supply section 138 forms a volute shape along the air outlet direction of the first flow guide section 137, so as to reduce the wind resistance of the airflow in the first air collecting chamber 139, so that the airflow forms a vortex in the first air collecting chamber 139, and can smoothly pass from the first air collecting chamber 139 to the first air supply chamber 125.

[0078] The above-mentioned first guide section 137 can be arranged on one side of the first centrifugal fan 131. Due to the space limitation of the longitudinal plate portion 1431, the front-to-back distance of the first guide section 137 is relatively small, and the first air supply section 138 is located below the heat exchanger accommodating cavity 144 (that is, below the longitudinal plate portion 1431 and the heat exchanger 140), so its front-to-back distance is greater than the first guide section 137, and the exhaust port of the first air supply section 138 is arranged at the front part of the first air collecting cavity 139 close to one side of the first jet portion 128 (corresponding to the position of the first air inlet 1281).

[0079] The structure of the second air supply assembly is consistent with that of the first air supply assembly. Specifically, the second centrifugal fan 151 generally includes a second air collecting port 152, a second impeller 153, and a second volute 154. The function of the second air collecting port 152 of the second centrifugal fan 151 is to ensure that the airflow can evenly fill the inlet interface of the second impeller 153 and reduce flow losses. The second air collecting port 152 of the second centrifugal fan 151 gradually shrinks in the direction of the second impeller 153 to form a bell mouth, which can absorb the air in the heat exchanger accommodating chamber 144 that exchanges heat with the heat exchanger 140 into the second impeller 153 as much as possible. When the second impeller 153 of the second centrifugal fan 151 is driven by the second high-speed motor 155 to rotate with the shaft, the gas between the second impeller 153 obtains centrifugal force as the second impeller 153 rotates, and the gas is thrown out of the second impeller 153 and enters the second volute 154. The gas pressure in the second volute 154 increases and is directed to be discharged. After the gas between the blades is exhausted, negative pressure is formed; the air of the heat exchanger 140 in the heat exchanger accommodating cavity 144 outside the second air collecting port 152 is continuously sucked in, thereby forming a continuous airflow.

[0080] The second impeller 153 and the second volute 154 of the second centrifugal fan 151 are arranged in the space defined by the longitudinal plate portion 1431 and the housing 112, and the exhaust port of the second volute 154 faces the side wall of the housing 110; the air inlet of the second air guide member 156 is connected to the exhaust port of the second volute 154. The second volute 154 is spiral-shaped, which absorbs the air thrown out from the second impeller 153, and converts the dynamic pressure of the airflow into static pressure through the gradually widening cross-sectional area.

[0081] The second air guide member 156 is connected between the exhaust port of the second centrifugal fan 151 and the second air inlet 1291 and is used to guide the airflow discharged by the second centrifugal fan 151 into the second air supply cavity. The second air guide member 156 may include a second guide section 157 and a second air supply section 158.

[0082] The second guide section 157 has an air inlet of the second wind guide component 156, and at least a portion of the second guide section 157 is spirally shaped, which guides the airflow discharged from the second centrifugal fan 151 downward. The second guide section 157 gradually shrinks along the airflow direction from the air inlet of the second wind guide component 156, thereby accelerating the wind speed of the airflow entering the second air collecting chamber 159 of the second air supply section 158.

[0083] The second air supply section 158 is connected to the second flow guide section 157, and defines a second air collecting chamber 159 therein to receive the airflow discharged from the second centrifugal fan 151. The second air supply section 158 is provided with a second air inlet 1281 to supply the airflow from the second air collecting chamber 159 to the second air supply chamber. The second air supply section 158 forms a volute shape along the air outlet direction of the second flow guide section 157, which reduces the wind resistance of the airflow in the second air collecting chamber 159, so that the airflow forms a vortex in the second air collecting chamber 159, and can smoothly pass from the second air collecting chamber 159 to the second air supply chamber.

[0084] The above-mentioned second guide section 157 can be arranged on one side of the second centrifugal fan 151. Due to the space limitation of the longitudinal plate portion 1431, the front-to-back distance of the second guide section 157 is relatively small, and the second air supply section 158 is located below the heat exchanger accommodating cavity 144 (that is, below the longitudinal plate portion 1431 and the heat exchanger 140), so its front-to-back distance is greater than the second guide section 157, and the exhaust port of the second air supply section 158 is arranged at the front part of the second air collecting cavity 159 close to the side of the second jet portion 129 (corresponding to the position of the second air inlet 1291).

[0085] The first air supply component and the second air supply component can cooperate with each other to realize air supply, the two can be started at the same time, or can be started separately. The working modes of the first air supply component and the second air supply component can include: the two run at the same wind speed, the two run at different wind speeds, the first air supply component runs alone, the second air supply component runs alone, and the first air supply component and the second air supply component run alternately.

[0086] The above working modes can be used in conjunction with various sensors of the indoor unit 100. By detecting the working environment of the indoor unit 100, the operating states of the first air supply component, the second air supply component and the heat exchanger 140 are adjusted according to the preset control mode. For example, when the temperature of the indoor unit 100 as a whole needs to be adjusted, the first air supply component and the second air supply component can be started at the same time, and continue to operate at the same wind speed (which can be determined according to the temperature difference between the set temperature and the actual temperature); in addition, the wind speeds of the first air supply component and the second air supply component can be set to be different, so that the direction of the air supply airflow is adjusted accordingly to adapt to the indoor space; in some special working conditions (for example, when air needs to be supplied to one side separately), the first air supply component and the second air supply component can be started selectively, and the first air supply component and the second air supply component can be started alternately, so as to achieve an effect similar to swinging wind and ensure the balanced operation of the internal components of the indoor unit 100.

[0087] Since the first air supply assembly and the second air supply assembly supply air to the first jet part 128 and the second jet part 129 respectively, the control method is more flexible and convenient, which can meet the air supply requirements of different working conditions and greatly improve the user experience.

[0088] The wall-mounted air conditioner indoor unit 100 of this embodiment has an air supply port 117 below the shell 110, which is used to arrange a ring-shaped jet assembly 120, so that the airflow that has exchanged heat through the heat exchanger 140 is ejected from the jet assembly 120, sucking in the ambient air around the air supply port 117, and mixing with the heat exchange airflow with a sharp temperature difference in the ambient environment, thereby ensuring that the airflow is soft and the feeling of blowing to the human body is more comfortable. On the one hand, the air supply volume of the indoor unit 100 is increased, the flow of indoor air is accelerated, and the overall indoor temperature can be uniformly reduced. In addition, the air outlet of the wall-mounted air conditioner indoor unit 100 of the present invention is an oblong shape (also called a runway shape), which is arranged below the shell 110, and the air inlet 116 is arranged on the top wall of the cover 112. The overall structure is similar to the existing traditional hanging indoor unit, which is easy to be accepted by users and easy to replace the existing traditional hanging indoor unit. The installation position is flexible, the internal components are compact in structure, and the space in the shell 110 is fully utilized, so that the wall-mounted air conditioner indoor unit 100 can be made thinner.

[0089] The flow direction of the heat exchange airflow of the wall-mounted air conditioner indoor unit 100 of this embodiment is as follows: after the first centrifugal fan 131 and the second centrifugal fan 151 are started, the air around the indoor unit 100 is sucked into the heat exchanger accommodating chamber 144 from the top air inlet 116, and heat is exchanged with the heat exchanger 140. A part of the airflow after heat exchange enters the first centrifugal fan 131, is accelerated by the first impeller 133, enters the first air guide component 136 through the first volute 134, and enters the first air collecting chamber 139 of the first air supply section 138 after being guided by the first guide section 137 of the first air guide component 136. The airflow travels in the first air collecting chamber 139 in a vortex manner and finally passes through the exhaust port of the first air supply section 138 and enters the annular first air supply chamber 125 from the first air inlet 1281, thereby forming the first heat exchange airflow.

[0090] Another part of the airflow after heat exchange enters the second centrifugal fan 151, is accelerated by the second impeller 153, enters the second air guide component 156 through the second volute 154, is guided by the second guide section 157 of the second air guide component 156, and enters the second air collecting cavity 159 of the second air supply section 158. The airflow travels in the second air collecting cavity 159 in a vortex manner and finally passes through the exhaust port of the second air supply section 158 and enters the annular second air supply cavity from the second air inlet 1291, thereby forming a second heat exchange airflow.

[0091] After the first heat exchange airflow enters the first air supply cavity 125, it is guided by the rear edge 126 of the annular inner wall 121 and ejected forward from the first jet port 124 at high speed, driving the air in the air circulation area 118 behind the air supply port 117 to be sucked through the first air extraction hole 1282, and then mixed in front of the indoor unit 100 and sent into the room, greatly increasing the air volume. At the same time, the airflow after heat exchange is mixed with the ambient air to become a soft airflow that is cool but not cold, thus accelerating the flow of indoor air. After entering the second air supply cavity, the second heat exchange airflow is guided by the rear edge of the annular inner wall of the second jet portion 129 and ejected forward from the second jet port at high speed, driving the air in the air circulation area 118 behind the air supply port 117 to be sucked through the second air extraction hole 1292.

[0092] 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 wall-mounted air conditioner indoor unit, comprising: A housing, the housing comprising a cover shell and a front panel arranged in front of the cover shell, an air inlet is provided on the top wall of the cover shell, an oblong air outlet is provided at the lower part of the front panel, the cover shell and the lower part of the front panel form the air outlet penetrating front and back, and the position where the air outlet is formed at the rear side of the cover shell is concave forward, so that there is an air circulation area behind the air outlet; A heat exchanger is disposed inside the shell; an air jet assembly, arranged in the air supply port, comprising a first air jet portion and a second air jet portion arranged transversely, wherein the first air jet portion and the second air jet portion are respectively formed with a first air jet opening and a second air jet opening, wherein the first air jet opening is arranged as a continuous annular groove, wherein the first air jet opening is used to eject the airflow in the first air jet portion forwardly, and drive the ambient air in the first air suction hole defined by the inner peripheral wall of the first air jet portion to be delivered forwardly, and the second air jet opening is used to eject the airflow in the second air jet portion forwardly, and drive the ambient air in the second air suction hole defined by the inner peripheral wall of the second air jet portion to be delivered forwardly, and the first air suction hole and the second air suction hole are respectively connected with the surrounding environment upstream in the air supply direction; A first air supply component and a second air supply component are arranged in a transverse interval inside the shell, wherein the first air supply component is used to generate a first heat exchange airflow entering from the air inlet on the top wall of the housing and supplied to the first jet part after heat exchange with the heat exchanger, and the second air supply component is used to generate a second heat exchange airflow entering from the air inlet on the top wall of the housing and supplied to the second jet part after heat exchange with the heat exchanger; The partition includes a longitudinal plate portion arranged parallel to the front panel, the middle portion of the longitudinal plate portion is recessed rearward to define a heat exchanger accommodating cavity for arranging the heat exchanger between the longitudinal plate portion and the front panel, the partition also includes a transverse plate portion connected to the top of the longitudinal plate portion and spaced apart from the top of the cover shell, the transverse plate portion defines an air inlet channel from the air inlet to the heat exchanger accommodating cavity.

2. The wall-mounted air conditioner indoor unit according to claim 1, wherein The air inlet is formed by an air inlet grille arranged on the top of the housing.

3. The wall-mounted air conditioner indoor unit according to claim 2, wherein The middle portion of the longitudinal plate portion is also provided with a first through hole and a second through hole which are arranged in a transverse interval. The first air supply component comprises: a first centrifugal fan, wherein an impeller and a volute of the first centrifugal fan are arranged in a space defined by the longitudinal plate portion and the housing, and an air collecting port of the first centrifugal fan passes through the first through hole to inhale air from the heat exchanger accommodating chamber to form the first heat exchange airflow; The second air supply assembly includes: a second centrifugal fan, the impeller and the volute of the first centrifugal fan are also arranged in the space defined by the longitudinal plate portion and the cover shell, and the air collecting port of the second centrifugal fan passes through the second through hole to inhale air from the heat exchanger accommodating chamber to form the second heat exchange airflow.

4. The wall-mounted air conditioner indoor unit according to claim 3, wherein The first jet part and the second jet part are respectively composed of an annular inner wall and an annular outer wall, and The annular outer wall and the annular inner wall of the first jet part jointly define a first air supply cavity, the edge where the annular outer wall and the annular inner wall of the first jet part meet forms the first jet port, and the end of the first jet part away from the second jet part is provided with a first air inlet connected to the first air supply component, so as to introduce the first heat exchange airflow into the first air supply cavity; The annular outer wall and the annular inner wall of the second jet part jointly define a second air supply cavity, the edge where the annular outer wall and the annular inner wall of the second jet part meet forms the second jet port, and the end of the second jet part away from the first jet part is provided with a second air inlet connected to the second air supply assembly, thereby introducing the second heat exchange airflow into the second air supply cavity.

5. The wall-mounted air conditioner indoor unit according to claim 4, wherein The rear edge of the annular inner wall of the first air-injecting portion is recessed toward the inside of the first air supply cavity, and the annular outer wall of the first air-injecting portion has an outward flange at a position opposite to the rear edge of the annular inner wall, so that the gap between the annular outer wall of the first air-injecting portion and the rear edge of the annular inner wall forms the first air-injecting port; The rear edge of the annular inner wall of the second jet portion is recessed into the second air supply cavity, and the annular outer wall of the second jet portion has an outward flange at a position relative to the rear edge of the annular inner wall, so that the gap between the annular outer wall of the second jet portion and the rear edge of the annular inner wall forms the second jet port.

6. The wall-mounted air conditioner indoor unit according to claim 5, wherein The annular inner wall of the first jet part extends forward from its rear edge to form a first Coanda surface that continuously expands outward; and the cross section of the annular outer wall of the first jet part located at the rear side of the jet assembly is spiral, so that the airflow of the first air supply cavity is ejected from the first jet port along the annular outer wall of the first jet part, and then sent forward along the first Coanda surface, and drives the ambient air in the first exhaust hole to be extracted; and The annular inner wall of the second jet portion extends forward from its rear edge to form a second Coanda surface that continuously expands outward; and the cross-section of the annular outer wall of the second jet portion located on the rear side of the jet assembly is spiral, so that the airflow of the second air supply cavity is ejected from the second jet port along the annular outer wall of the second jet portion, and then sent forward along the second Coanda surface, driving the ambient air in the second exhaust hole to be extracted.

7. The wall-mounted air conditioner indoor unit according to claim 4, wherein The exhaust port of the volute of the first centrifugal fan faces the side wall of the housing on the side of the first air inlet, and the first air supply assembly further includes: a first air guide component, the first air guide component being connected between the exhaust port of the first centrifugal fan and the first air inlet to guide the airflow exhausted by the first centrifugal fan into the first air supply cavity; The exhaust port of the volute of the second centrifugal fan faces the side wall of the shell on the side of the second air inlet, and the second air supply assembly includes: a second air guide component, which is connected between the exhaust port of the second centrifugal fan and the second air inlet to guide the airflow exhausted by the second centrifugal fan into the second air supply chamber.

8. The wall-mounted air conditioner indoor unit according to claim 7, wherein The first air guide component comprises: a first guide section, which has an air inlet of the first air guide component, connected to the exhaust port of the volute of the first centrifugal fan, and at least a part of the first guide section is spiral, guiding the airflow discharged by the first centrifugal fan downward; a first air supply section, which is connected to the first guide section, and defines a first air collecting cavity inside thereof to receive the airflow discharged by the first centrifugal fan, and the first air supply section is provided with a first exhaust port connected to the first air inlet, so that the airflow of the first air collecting cavity is supplied to the first air supply cavity; and The second air guide component includes: a second guide section, which has an air inlet of the second air guide component, connected to the exhaust port of the volute of the second centrifugal fan, and at least a part of the second guide section is spiral, guiding the airflow discharged by the second centrifugal fan to be directed downward; a second air supply section, which is connected to the second guide section and defines a second air collecting chamber inside to receive the airflow discharged by the second centrifugal fan, and the second air supply section is provided with a second exhaust port connected to the second air inlet, so that the airflow in the second air collecting chamber is supplied to the second air supply chamber.

9. The wall-mounted air conditioner indoor unit according to claim 8, wherein The first guide section gradually contracts from the air inlet of the first air guide component along the air flow direction, and the first air supply section forms a volute shape along the air outlet direction of the first guide section, so as to reduce the wind resistance of the first heat exchange air flow in the first air collecting cavity; The second guide section gradually shrinks from the air inlet of the second air guide component along the air flow direction, and the second air supply section forms a volute shape along the air outlet direction of the second guide section, thereby reducing the wind resistance of the second heat exchange airflow in the second air collecting cavity.

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