Centrifugal fan and duct type air conditioner

Abstract

The utility model provides a centrifugal fan and a duct type air conditioner, and belongs to the technical field of air conditioners. The duct type air conditioner comprises a machine shell, an air inlet cavity and a heat exchange cavity which are distributed in the width direction of the machine shell are defined in the machine shell, the machine shell comprises an air inlet and an air outlet, the air inlet communicates with the air inlet cavity, and the air outlet communicates with the heat exchange cavity; the heat exchanger is arranged in the heat exchange cavity; the volute is arranged in the air inlet cavity and comprises an air inlet and an air outlet which are communicated with each other; the centrifugal wind wheel is arranged in the volute; the first flow guide structure is arranged on the side face, facing the centrifugal wind wheel, of the end plate, and the first flow guide structure surrounds the periphery of the air inlet; the second flow guide structure surrounds the periphery of the air inlet and is located between the first flow guide structure and the air inlet; the first flow guide structure is provided with a plurality of discontinuous first flow guide ribs, the second flow guide structure is provided with a plurality of discontinuous second flow guide ribs, the first flow guide ribs and the second flow guide ribs are distributed in a staggered mode and located on the inner side of the air inlet, airflow leakage is reduced, and fan surge is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of air conditioning, and in particular relates to a centrifugal fan and an air duct fan. Background Art

[0002] With the popularity of air conditioners, more and more users choose to install central air conditioners at home. As a type of central air conditioner, duct air conditioners are favored by users for their low cost, simple structure, hidden installation and other advantages. The existing duct air conditioner is installed in the ceiling, which mainly includes a casing and a centrifugal fan and a heat exchanger installed inside the casing. The casing is provided with an air inlet and an air outlet. The centrifugal fan introduces air into the casing from the air inlet, and sends air out from the air outlet after heat exchange in the heat exchanger.

[0003] Conventional centrifugal fans in the prior art include a volute and a centrifugal fan, with an air inlet and an air outlet formed on the volute. After the airflow is sucked into the volute through the air inlet, the centrifugal fan wheel rotates to drive the airflow inside the volute along the volute profile. The airflow near the two sides of the volute will leak out from the air inlet through the axial gap between the volute and the centrifugal fan wheel, which can easily cause the centrifugal fan to surge.

[0004] The surge of centrifugal fans is manifested as periodic intake and exhaust, periodic fluctuations in air volume, outlet air pressure, and motor current, and abnormal noise. In severe cases, it may cause damage to the centrifugal fan wheel and motor, and thus cause the entire machine to fail to operate. Utility Model Content

[0005] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end,

[0006] According to an embodiment of the present disclosure, a duct machine is provided, comprising:

[0007] A casing, wherein an air inlet cavity and a heat exchange cavity arranged along the width direction of the casing are defined therein, the casing comprising an air inlet and an air outlet, the air inlet is communicated with the air inlet cavity, and the air outlet is communicated with the heat exchange cavity;

[0008] A heat exchanger is disposed in the heat exchange cavity and performs heat exchange on the air entering the heat exchange cavity;

[0009] A volute, disposed in the air inlet cavity, the volute comprising an air inlet and an air outlet that are connected, the air inlet being disposed on an end plate of the volute and connected to the air inlet cavity, and the air outlet being connected to the heat exchange cavity;

[0010] A centrifugal wind wheel is arranged in the volute, and the centrifugal wind wheel rotates to drive air from the air inlet through the volute to be introduced into the heat exchange cavity, and is sent out from the air outlet after heat exchange in the heat exchanger;

[0011] A first flow guide structure is provided on the side of the end plate facing the centrifugal wind wheel, and the first flow guide structure surrounds the air inlet;

[0012] A second flow guiding structure, surrounding the air inlet and located between the first flow guiding structure and the air inlet;

[0013] The first flow guiding structure has a plurality of discontinuous first flow guiding ribs, and the second flow guiding structure has a plurality of discontinuous second flow guiding ribs, and the plurality of first flow guiding ribs and the plurality of second flow guiding ribs are staggered in distribution.

[0014] The duct fan provided by the technical solution reduces air leakage and improves fan surge by arranging multiple first guide ribs and multiple second guide ribs on the inner side of the air inlet. At the same time, the multiple first guide ribs and multiple second guide ribs are staggered and distributed with each other, so that the airflow flowing out of the gap between two adjacent first guide ribs can be blocked by the second guide ribs, thereby strengthening the blocking effect of the airflow, reducing the leakage of the airflow to the outside of the volute, and improving the fan efficiency.

[0015] According to an embodiment of the present disclosure, a duct machine is also provided, comprising:

[0016] A casing, wherein an air inlet cavity and a heat exchange cavity arranged along the width direction of the casing are defined therein, the casing comprising an air inlet and an air outlet, the air inlet is communicated with the air inlet cavity, and the air outlet is communicated with the heat exchange cavity;

[0017] A heat exchanger is disposed in the heat exchange cavity and performs heat exchange on the air entering the heat exchange cavity;

[0018] A volute, disposed in the air inlet cavity, the volute comprising an air inlet and an air outlet that are connected, the air inlet being disposed on an end plate of the volute and connected to the air inlet cavity, and the air outlet being connected to the heat exchange cavity;

[0019] A centrifugal wind wheel is arranged in the volute, and the centrifugal wind wheel rotates to drive air from the air inlet through the volute to be introduced into the heat exchange cavity, and is sent out from the air outlet after heat exchange in the heat exchanger;

[0020] A first flow guide structure is provided on the side of the end plate facing the centrifugal wind wheel, and the first flow guide structure surrounds the air inlet;

[0021] The first flow guiding structure has a plurality of discontinuous first flow guiding ribs;

[0022] a second flow-guiding structure, surrounding the air inlet and located between the first flow-guiding structure and the air inlet, the second flow-guiding structure having a plurality of discontinuous second flow-guiding ribs;

[0023] The first flow guiding structures and the second flow guiding structures are alternately distributed, so that the first flow guiding ribs and the second flow guiding ribs are staggeredly distributed.

[0024] The duct fan provided by the technical solution is provided with a first guide structure and a second guide structure on the inner side of the air inlet to reduce airflow leakage and improve fan surge. The first guide structure and the second guide structure are arranged alternately so that the first guide ribs and the second guide ribs are staggered, so that the first guide ribs and the second guide ribs can form a labyrinth-type airflow blocking structure, improve the airflow blocking effect, reduce airflow leakage to the outside of the volute, and improve fan efficiency.

[0025] According to an embodiment of the present disclosure, an air guide ring is provided at the edge of the air inlet. In the axial direction of the centrifugal wind wheel, the height of the air guide ring is greater than the height of the first guide rib and the second guide rib, which facilitates the installation of the centrifugal wind wheel.

[0026] According to an embodiment of the present disclosure, in the radial direction of the centrifugal wind wheel, the outer dimension of the first flow guide structure is not less than the outer diameter dimension of the blades of the centrifugal wind wheel, thereby ensuring the blocking effect of the first flow guide structure on the airflow.

[0027] According to an embodiment of the present disclosure, in the radial direction of the centrifugal wind wheel, the outer dimension of the second flow guide structure is not less than the inner diameter dimension of the blades of the centrifugal wind wheel, thereby preventing the leaked airflow from being re-sucked into the centrifugal wind wheel and improving the efficiency of the centrifugal fan.

[0028] According to an embodiment of the present disclosure, the straight-line distance between the two ends of two adjacent first guide ribs that are close to each other is not less than 10 mm, which facilitates the processing of the second guide ribs.

[0029] According to an embodiment of the present disclosure, the ratio of the thickness of the first guide rib and / or the second guide rib to the thickness of the end plate where it is located is 0.6-0.8. This arrangement facilitates the molding of the volute and avoids appearance defects.

[0030] According to an embodiment of the present disclosure, there is also provided a centrifugal fan, comprising:

[0031] A volute, the volute comprising an air inlet and an air outlet connected to each other, the air inlet being arranged on an end plate of the volute;

[0032] A centrifugal fan wheel is arranged in the volute, and the centrifugal fan wheel drives air to be introduced into the volute from the air inlet through rotation, and is sent out from the air outlet;

[0033] A first flow guide structure is provided on the side of the end plate facing the centrifugal wind wheel, and the first flow guide structure surrounds the air inlet;

[0034] A second flow guiding structure, surrounding the air inlet and located between the first flow guiding structure and the air inlet;

[0035] The first flow guiding structure has a plurality of discontinuous first flow guiding ribs, and the second flow guiding structure has a plurality of discontinuous second flow guiding ribs, and the plurality of the first flow guiding ribs and the plurality of the second flow guiding ribs are staggered in distribution;

[0036] The first flow guiding structure, the second flow guiding structure and the centrifugal fan are arranged concentrically, so that each part of the first flow guiding structure and each part of the second flow guiding structure have a relatively uniform blocking effect on the leaking airflow.

[0037] According to an embodiment of the present disclosure, a plurality of the first guide ribs are arranged at intervals along a first circumferential direction, and a plurality of the second guide ribs are arranged at intervals along a second circumferential direction, so as to facilitate processing and forming.

[0038] According to an embodiment of the present disclosure, in the radial direction of the centrifugal wind wheel, there is an overlapping area between the second guide rib and two adjacent first guide ribs, so that the second guide rib can effectively block the airflow leaking between the two adjacent first guide ribs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figures 1 to 3 is a structural stereogram of a duct machine according to an embodiment of the present disclosure;

[0041] Figure 4 This is an internal structure diagram of a duct machine after the top plate is omitted according to one embodiment of the present disclosure;

[0042] Figure 5 is a rear view of a duct machine according to one embodiment of the present disclosure;

[0043] Figure 6 yes Figure 5 The cross-sectional view along the AA direction;

[0044] Figure 7 The structure of the centrifugal fan according to one embodiment of the present disclosure is shown in FIG. Figure 1 ;

[0045] Figure 8 The structure of the centrifugal fan according to one embodiment of the present disclosure is shown in FIG. Figure 2 ;

[0046] Fig. 9 is a schematic structural diagram of a volute according to an embodiment of the present disclosure;

[0047] Fig.10 is a rear view of a volute according to an embodiment of the present disclosure;

[0048] Fig.11 yes Fig.10 The cross-sectional view along the BB direction;

[0049] Fig.12 A cross-sectional view of a volute according to an embodiment of the present disclosure Figure 1 ;

[0050] Fig.13 is a side view of a centrifugal fan according to one embodiment of the present disclosure;

[0051] Fig.14 yes Fig.13 Cross-section along CC direction Figure 1 ;

[0052] Fig.15 A cross-sectional view of a centrifugal fan according to an embodiment of the present disclosure Figure 1 ;

[0053] Fig.16 A cross-sectional view of a centrifugal fan according to an embodiment of the present disclosure Figure 2 ;

[0054] Fig.17 A cross-sectional view of a volute according to an embodiment of the present disclosure Figure 2 ;

[0055] Fig.18 yes Fig.13 Cross-section along CC direction Figure 2 ;

[0056] Fig.19 is a cross-sectional view of a centrifugal fan according to one embodiment of the present disclosure;

[0057] Fig. 20 yes Fig.19 The schematic diagram of the structure after the centrifugal wind wheel is omitted.

[0058] In the above figures: duct machine 100; casing 1; air inlet chamber 11; heat exchange chamber 12; air inlet 13; air outlet 14; top plate 15; bottom plate 16; side plate 17; partition 18; heat exchanger 2; centrifugal fan 3; volute 31; air inlet 311; air outlet 312; end plate 313; peripheral side plate 314; centrifugal wind wheel 32; blade 321; drive motor 33; first guide rib 4; second guide rib 5; air guide ring 6; first circumference 71; second circumference 72. DETAILED DESCRIPTION

[0059] In order to make the purpose and implementation method of the present application clearer, the exemplary implementation method of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0060] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below. It is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0061] The terms "first", "second", etc. in the specification and claims of this application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances.

[0062] The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to all the components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0063] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In the present application, the central air-conditioning duct-type indoor unit (abbreviated as duct unit) belongs to an air conditioner, which includes a duct unit (i.e., the indoor unit of the air conditioner) and an air-conditioning outdoor unit (i.e., the outdoor unit of the air conditioner). The air conditioner performs a refrigeration cycle of the indoor unit by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0065] The utility model provides a duct machine 100, as shown below Figures 1 to 20 The duct machine 100 is described. Figure 1 to Figure 3 The figure is a whole machine diagram of a duct machine 100 provided according to an embodiment of the utility model. The duct machine 100 is the indoor unit part of a duct machine type air conditioner. In addition, the duct machine type air conditioner also includes an outdoor unit of the air conditioner.

[0066] refer to Figure 1-2 In an exemplary embodiment of the duct machine 100 of the present invention, the duct machine 100 may include a housing 1. The housing 1 forms the overall appearance of the duct machine 100.

[0067] A receiving cavity is formed inside the housing 1. The receiving cavity is used to receive and fix various components in the duct machine 100, which can prevent foreign objects from colliding with the various components in the housing 1, thereby improving the reliability of the duct machine 100 during transportation or installation.

[0068] In some embodiments of the present application, the housing 1 may include an air inlet 13 .

[0069] The air inlet 13 is in communication with the accommodating cavity, and serves as an inlet for the external air of the casing 1 to flow in, allowing the indoor air to enter the accommodating cavity through the air inlet 13 .

[0070] In some embodiments of the present application, the housing 1 may include an air outlet 14 .

[0071] The air outlet 14 is communicated with the accommodating cavity, and serves as an outlet for the heat exchange airflow in the housing 1 to flow out, allowing the airflow in the accommodating cavity to flow out through the air outlet 14 .

[0072] The air inlet 13 may be disposed at one end of the housing 1 , and the air outlet 14 may be disposed at the other end of the housing 1 .

[0073] The housing 1 is roughly in the shape of a rectangular parallelepiped. Figure 1 The air inlet 13 and the air outlet 14 are located at two ends of the housing 1 in the width direction of the housing 1 respectively.

[0074] The housing 1 may include a top plate 15. The top plate 15 forms a top end of the housing 1.

[0075] The housing 1 may include a bottom plate 16. The bottom plate 16 forms a top end of the housing 1.

[0076] The top end of the casing 1 and the bottom end of the casing 1 are two ends of the casing 1 that are oppositely arranged in the vertical direction.

[0077] The housing 1 may include two side panels 17. Figure 2 , Figure 3 The side panels 17 are connected to the left and right sides of the top panel 15 and the bottom panel 16 , and the two side panels 17 form two opposite ends of the housing 1 in the length direction of the housing 1 .

[0078] The accommodating cavity may be formed by a top plate 15 , a bottom plate 16 and two side plates 17 .

[0079] refer to Figure 4 In some embodiments of the present application, the duct machine 100 may include a partition 18 .

[0080] The partition 18 is extended along the length direction of the casing 1 and disposed in the accommodating cavity, so that the casing 1 is defined with an air inlet cavity 11 and a heat exchange cavity 12 arranged along the width direction of the casing 1 .

[0081] The air inlet cavity 11 is connected to the air inlet 13 , and the heat exchange cavity 12 is connected to the air outlet 14 .

[0082] refer to Figure 3 to Figure 6 In some embodiments of the present application, the duct machine 100 may include a heat exchanger 2 .

[0083] The heat exchanger 2 is disposed in the heat exchange chamber 12 to perform heat exchange on the air entering the heat exchange chamber 12 .

[0084] The heat exchanger 2 may be disposed at a position corresponding to the air outlet 14 .

[0085] The heat exchanger 2 is disposed obliquely in the heat exchange chamber 12 .

[0086] refer to Figure 6 In this embodiment, along the vertical direction of the housing 1, the heat exchanger 2 is tilted toward the side close to the air outlet 14. This arrangement increases the heat exchange area of ​​the heat exchanger 2, improves the heat exchange efficiency of the air duct unit 100, and increases the amount of air exchanged.

[0087] In some embodiments of the present application, the air conditioner has a refrigerant circuit, which is annularly connected to a compressor, a condenser, a throttling device and an evaporator in sequence to circulate the refrigerant.

[0088] The air conditioner outdoor unit may include an outdoor casing.

[0089] An outdoor accommodation space may be provided in the outdoor housing.

[0090] The outdoor housing may be provided with an outdoor air inlet, which may be connected to the outdoor accommodation space and may be used to introduce outdoor air into the outdoor accommodation space.

[0091] The outdoor housing may be provided with an outdoor air outlet, which may be connected to the outdoor accommodation space, and may be used to lead the air in the outdoor accommodation space out of the outdoor accommodation space.

[0092] The air conditioner outdoor unit may include an outdoor heat exchanger. The outdoor heat exchanger may be arranged in the outdoor accommodation space.

[0093] The air conditioner outdoor unit may include an outdoor fan. The outdoor fan may be arranged in the outdoor accommodation space.

[0094] The rotation of the outdoor fan causes outdoor air to enter the outdoor accommodation space from the outdoor air inlet to exchange heat with the outdoor heat exchanger, and the outdoor air after heat exchange flows out of the outdoor accommodation space from the outdoor air outlet.

[0095] The air conditioner may include a compressor, and the compressor is arranged in the outdoor accommodation space.

[0096] The air conditioner may include a throttling device. The throttling device is used for throttling. The throttling device may be arranged in the outdoor accommodation space.

[0097] The air conditioner performs the refrigeration cycle of the air conditioner by using a compressor, a condenser, a throttling device and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been conditioned and heat exchanged.

[0098] The compressor compresses the low-temperature and low-pressure refrigerant gas and discharges the high-temperature and high-pressure refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0099] The throttle device expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant.

[0100] The evaporator evaporates the refrigerant expanded in the throttling device and returns the refrigerant gas in a low temperature and low pressure state to the compressor.

[0101] The evaporator can achieve a refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the whole cycle, the air conditioner can adjust the temperature of the indoor space.

[0102] Of the heat exchanger 2 and the outdoor heat exchanger, one is a condenser and the other is an evaporator. When the heat exchanger 2 is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the heat exchanger 2 is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.

[0103] In some embodiments of the present application, the duct fan 100 may include a centrifugal fan 3 .

[0104] refer to Figure 6 The centrifugal fan 3 is arranged in the air inlet chamber 11, and is used to drive the indoor air outside the casing 1 to enter the casing 1 through the air inlet 13, and make the air in the casing 1 flow along the air inlet 13 toward the air outlet 14.

[0105] refer to Figure 7 to Figure 20 The utility model also proposes a centrifugal fan 3.

[0106] In some embodiments of the present application, reference Figure 8The centrifugal fan 3 may include a volute 31 .

[0107] The volute 31 is disposed in the air inlet cavity 11 . The volute 31 may be connected to the partition 18 .

[0108] refer to Figures 7 to 9 The volute 31 may include an air inlet 311. The air inlet 311 is used to take air into the volute 31.

[0109] The volute 31 may include an air outlet 312 . The air outlet 312 is connected to the air inlet 311 to form an air duct, and the air outlet 312 is used to supply air to the outside of the volute 31 .

[0110] In some embodiments of the present application, the centrifugal fan 3 may include a centrifugal fan wheel 32. The centrifugal fan wheel 32 is disposed in the air duct in the volute 31, and the centrifugal fan wheel 32 drives air from the air inlet 311 into the air duct inside the volute 31 through rotation, and is discharged through the air outlet 312.

[0111] In some embodiments of the present application, the centrifugal fan 3 may include a drive motor 33. Figure 5 The driving motor 33 is connected to the centrifugal wind wheel 32 to drive the centrifugal wind wheel 32 to rotate.

[0112] In some embodiments of the present application, the volute 31 may include two end plates 313 disposed opposite to each other. The air inlet 311 is opened on the end plates 313 of the volute 31 .

[0113] The outer contours of the two end plates 313 are consistent. Both end plates 313 are flat plates.

[0114] In some embodiments of the present application, the volute 31 may include a peripheral side plate 314 .

[0115] The peripheral side plate 314 is disposed between the two end plates 313 and forms an air outlet 312 of the volute 31 at the end.

[0116] The peripheral side plate 314 is in a curved shape.

[0117] The outer edge shape of the end plate 313 matches the outer edge shape of the peripheral side plate 314 , and the two end plates 313 are respectively installed on both sides of the peripheral side plate 314 , thereby forming the volute 31 .

[0118] The peripheral side plate 314 may be disposed between the two end plates 313 along the volute profile.

[0119] The air inlet 311 is communicated with the air inlet chamber 11 , and the air outlet 312 is communicated with the heat exchange chamber 12 , so that the air duct is communicated with the air inlet chamber 11 and the heat exchange chamber 12 .

[0120] The centrifugal wind wheel 32 rotates to drive air to be introduced into the heat exchange chamber 12 from the air inlet 13 through the air duct, and is sent out from the air outlet 14 after heat exchange in the heat exchanger 2.

[0121] When the centrifugal fan 3 is working, the driving motor 33 drives the centrifugal fan wheel 32 to rotate. The rotation of the centrifugal fan wheel 32 drives air to be sucked into the air inlet cavity 11 from the air inlet 13, and then enters the air duct inside the volute 31 through the air inlet 311.

[0122] The airflow in the air duct flows through the centrifugal wind wheel 32, enters the heat exchange chamber 12 through the air outlet 312 and blows toward the heat exchanger 2. After the airflow of the heat exchanger 3 is heat exchanged, it forms a heat exchange airflow and finally blows into the room through the air outlet 14, thereby forming a cycle to adjust the indoor temperature. The heat exchange airflow is hot air or cold air.

[0123] In the conventional centrifugal fan in the prior art, after the air flow is sucked into the volute 31 through the air inlet 311, the centrifugal fan wheel 32 rotates to drive the air flow to move inside the volute 31 along the volute profile. The air flow near the two side areas of the volute 31 will pass through the axial gap between the volute 31 and the centrifugal fan wheel 32 and leak out from the air inlet 311, which can easily cause the centrifugal fan to surge.

[0124] The centrifugal fan surge is manifested as periodic intake and exhaust, periodic fluctuations in air volume, outlet air pressure, and motor current, and abnormal noise. In severe cases, it may cause damage to the centrifugal fan wheel 32 and the motor, and thus cause the entire machine to fail to operate.

[0125] It can be understood that the axial gap is the gap between the volute 31 and the centrifugal impeller 32 in the axial direction of the centrifugal impeller 32 .

[0126] In order to improve the surge of the centrifugal fan 3, in some embodiments of the present application, the duct fan may include a first flow guiding structure.

[0127] The first flow guiding structure is disposed on the side of the end plate 313 facing the centrifugal wind wheel 32 , and the first flow guiding structure surrounds the air inlet.

[0128] A gap is provided between the first flow guiding structure and the edge of the air inlet 311. This arrangement enables the first flow guiding structure to be arranged inside the air inlet 311, which can prevent the airflow in the volute 31 from flowing toward the outer air inlet.

[0129] After the airflow is sucked into the volute 31 through the air inlet 311 , the first flow guiding structure can guide the airflow in the volute 31 .

[0130] The rotation of the centrifugal wind wheel 32 drives the airflow to move along the contour inside the volute 31. The airflow close to the two sides of the volute 31 (end plate 313) flows along the direction of the first guide rib 4 under the constraint of the first guide rib 4, and at the same time hinders the airflow from moving toward the outside of the first guide rib 4 in the axial direction of the centrifugal wind wheel 32, thereby reducing the leakage of the airflow to the outside of the volute 31 and improving the fan surge.

[0131] The air duct machine may include a second flow guiding structure. The second flow guiding structure may surround the air inlet 311 .

[0132] The second flow guiding structure can prevent the airflow from passing through the axial gap between the end plate 313 and the centrifugal wind wheel 32 and leaking outward from the air inlet 311 of the volute 31 .

[0133] The second flow guiding structure is located between the first flow guiding structure and the air inlet 311. This arrangement can further block the airflow not blocked by the first flow guiding structure, thereby reducing leakage of the airflow.

[0134] In some embodiments of the present application, reference Figures 8 to 12 The first flow guiding structure may have a plurality of discontinuous first flow guiding ribs 4 , that is, there is a gap between two adjacent first flow guiding ribs 4 .

[0135] There is a gap between two adjacent first guide ribs 4 , and when the centrifugal fan 3 is working, the airflow in the volute 31 can flow into the outside of the first guide rib 4 through the gap.

[0136] In some embodiments of the present application, the second flow guiding structure has a plurality of discontinuous second flow guiding ribs 5, that is, there is a gap between two adjacent second flow guiding ribs 5. The plurality of first flow guiding ribs 4 and the plurality of second flow guiding ribs 5 are staggered in distribution.

[0137] By staggering the distribution of the plurality of first guide ribs 4 and the plurality of second guide ribs 5, the airflow flowing out of the gap between two adjacent first guide ribs 4 can be blocked by the second guide ribs 5, thereby enhancing the blocking effect on the airflow, reducing the leakage of the airflow to the outside of the volute 31, improving the fan surge, and improving the fan efficiency.

[0138] refer to Fig.12 , Fig.14 In some embodiments of the present application, the centrifugal fan 3 may include an air guide ring 6.

[0139] The volute 31 is provided with an air guide ring 6 at the air inlet 311. Fig.14 The air guide ring 6 is arranged inside the volute 31, and the air guide ring 6 can guide the airflow, so that the airflow flows along the air guide ring 6 toward the inside of the air duct.

[0140] The air guide ring 6 is formed at the edge of the air inlet 311 , wherein the central axis of the air guide ring 6 may coincide with the central axis of the centrifugal wind wheel 32 .

[0141] In some embodiments of the present application, the first flow guiding structure has a plurality of discontinuous first flow guiding ribs 4 , and the second flow guiding structure has a plurality of discontinuous second flow guiding ribs 5 .

[0142] The first flow guiding structures and the second flow guiding structures are alternately distributed, so that the first flow guiding ribs 4 and the second flow guiding ribs 5 are staggeredly distributed.

[0143] When the centrifugal fan 3 is working, the airflow inside the volute 31 will circle inside the volute 31. By arranging the first guide ribs 4 and the second guide ribs 5 to be staggered, the first guide ribs 4 and the second guide ribs 5 can form a labyrinth-type airflow blocking structure.

[0144] The palace-type airflow blocking structure is located in the gap between the centrifugal wind wheel 32 and the end plate 313, which can not only guide and block the airflow on both sides of the volute 31. At the same time, because the first guide structure and the second guide structure are discontinuous structures, when the airflow enters between the first guide rib 4 and the second guide rib 5, turbulence will not be formed, thereby improving the efficiency of the centrifugal fan 3.

[0145] In some embodiments of the present application, the first air guide structure and the centrifugal fan are arranged concentrically.

[0146] In some embodiments of the present application, the second air guide structure is arranged concentrically with the centrifugal fan.

[0147] refer to Fig.15 , Fig.16 In this embodiment, the first guide structure and the second guide structure are arranged concentrically with the centrifugal fan. Under this arrangement, the gaps between each first guide rib 4 and each second guide rib 5 and the air inlet 311 of the volute 31 are uniform. Similarly, the gaps between the first guide rib 4 and the adjacent second guide rib 5 are uniform, so that each first guide structure and each second guide structure have a relatively uniform blocking effect on the leaking airflow.

[0148] In some embodiments of the present application, a plurality of first guide ribs 4 are arranged at intervals along the first circumference 71 , and a plurality of second guide ribs 5 are arranged at intervals along the second circumference 72 .

[0149] In some embodiments of the present application, a plurality of first guide ribs 4 may be evenly spaced in the direction of the first circumference 71 , and a plurality of second guide ribs 5 may be evenly spaced in the direction of the second circumference 72 .

[0150] The first circle 71 and the second circle 72 may be arranged concentrically.

[0151] In some embodiments of the present application, in the radial direction of the centrifugal wind wheel 32, there is an overlapping area between the second guide rib 5 and the two adjacent first guide ribs 4. This arrangement enables the second guide rib 5 to effectively block the airflow leaking from the gap between the two adjacent first guide ribs 4, thereby preventing the airflow leaking from the first guide structure from directly flowing to the air inlet 311.

[0152] In some embodiments of the present application, in the axial direction of the centrifugal wind wheel 32 , the height of the air guide ring is greater than the height of the first guide rib 4 and the second guide rib 5 .

[0153] By setting the height of the air guide ring 6 to be greater than the heights of the first guide ribs 4 and the second guide ribs 5 , interference of the first guide ribs 4 and the second guide ribs 5 with the installation of the centrifugal wind wheel 32 is avoided, thereby facilitating the installation of the centrifugal wind wheel 32 .

[0154] refer to Fig.14 In this embodiment, the first guide rib 4 and the second guide rib 5 have the same height. Fig.13 In the embodiment, the height of the air guide ring 6 is H1, and the height of the first guide rib 4 and the second guide rib 5 is H2. Among them, H1>H2.

[0155] In this embodiment, the height of the air guide ring 6 is the distance between the end of the air guide ring 6 away from the end plate 313 and the outer side surface of the end plate 313 connected thereto. The height of the first guide rib 4 and the second guide rib is the distance between the end of the air guide ring 6 away from the end plate 313 and the outer side surface of the end plate 313 connected thereto.

[0156] In the above embodiment, Fig.14 The heights of the first guide ribs 4 are consistent. Similarly, the heights of the second guide ribs 5 are also consistent.

[0157] In some embodiments of the present application, in the radial direction of the centrifugal wind wheel 32 , the outer diameter of the first flow guide structure is not less than the outer diameter of the blades of the centrifugal wind wheel 32 .

[0158] refer to Fig.14 , Fig.15 , the outer dimension of the first flow-guiding structure is D1, and the outer diameter dimension of the blades of the centrifugal wind wheel 32 is D2. D1≥D2, so that the first flow-guiding structure blocks the airflow from moving toward the outside of the first flow-guiding structure in the axial direction of the centrifugal wind wheel 32, reduces the leakage of the airflow toward the outside of the volute 31, and ensures the blocking effect of the first flow-guiding structure on the airflow.

[0159] It can be understood that the outer diameter of the blades of the centrifugal wind wheel 32 is the diameter of the outer edge of the blades of the centrifugal wind wheel 32. The outer dimension of the first flow guide structure is the dimension of the first line segment, which passes through the center of the centrifugal wind wheel 32 and has two endpoints at any point on the outer edge of the first flow guide structure.

[0160] In some embodiments of the present application, in the radial direction of the centrifugal wind wheel 32 , the outer dimension of the second flow guide structure is not less than the inner diameter dimension of the blades of the centrifugal wind wheel 32 .

[0161] refer to Fig.16 , the outer dimension of the second flow guide structure is D3, and the inner diameter dimension of the blades of the centrifugal wind wheel 32 is D4. D3≥D4, so that the airflow leaked from the first flow guide structure is drawn by the second flow guide structure before reaching the inner edge of the blades of the centrifugal wind wheel 32, thereby preventing the airflow leaked from the first flow guide structure from being re-inhaled into the inlet of the centrifugal wind wheel 32, thereby improving the efficiency of the centrifugal fan 3.

[0162] It can be understood that the inner diameter size of the blades of the centrifugal wind wheel 32 is the diameter size of the inner edge of the blades of the centrifugal wind wheel 32. The outer size of the second flow guide structure is the size of the first line segment, and the second line segment is a line segment passing through the center of the centrifugal wind wheel 32 and having two endpoints at any point on the outer edge of the second flow guide structure.

[0163] In some embodiments of the present application, reference Fig.17 The straight-line distance L between the two ends of two adjacent first guiding ribs 4 that are close to each other is not less than 10 mm. This setting limits the minimum length of the second guiding rib 5 and facilitates the processing and forming of the first guiding rib 4 and the second guiding rib 5.

[0164] In some embodiments of the present application, the ratio of the thickness of the first guide rib 4 and / or the second guide rib 5 to the thickness of the end plate 313 where the first guide rib 4 and / or the second guide rib 5 is located is 0.6 to 0.8.

[0165] The ratio of the thickness of the first guide rib 4 to the thickness of the end plate 313 and / or the thickness of the second guide rib 5 to the thickness of the end plate 313 is set within a reasonable range, so that the thickness of the first guide rib 4 and / or the second guide rib 5 is within a reasonable range, which facilitates the molding of the first guide rib 4 and the volute 31 and avoids appearance defects.

[0166] In this embodiment, the thickness of the first guiding rib 4 is the same as the thickness of the second guiding rib 5 .

[0167] refer to Fig.18 , the thickness of the first guide rib 4 is a, and the thickness of the end plate 313 where the first guide rib 4 is located is b. Wherein, 0.6≤a / b. a / b≤0.8.

[0168] If a / b is too large, the thickness of the first guide rib 4 will be too large, that is, the first guide rib 4 will be too thick. If the first guide rib 4 is too thick and then processed, it is easy to cause appearance defects on the end plate 313 where the first guide rib 4 is located. In order to avoid appearance defects of the volute 31, the thickness of the first guide rib 4 and the thickness of the end plate 313 are reasonably set, and a / b is set not to exceed the first parameter value. For example, the first parameter value can be 0.8, 0.75, or 0.7. Consider selecting a suitable and specific parameter in the specific design.

[0169] If a / b is too small, the thickness of the first guide rib 4 is too small, that is, the first guide rib 4 is too thin. If the first guide rib 4 is too thin, its structural strength will be affected. In order to ensure the structural strength of the first guide rib 4 and prevent airflow leakage, a / b is set to be not less than the second parameter value. For example, the second parameter value can be 0.6, 0.63, or 0.65. Consider selecting a suitable and specific parameter in the specific design.

[0170] In some embodiments of the present application, reference 19, Fig. 20 The first guide ribs 4 are arranged with equal thickness, and the second guide ribs 5 are arranged with equal thickness. This arrangement facilitates the processing of the first guide ribs 4 and the second guide ribs 5.

[0171] In some embodiments of the present application, in the axial direction of the centrifugal wind wheel 32, two end plates 313 form two ends of the volute 31, and the thickness of the plurality of first guide ribs 4 is the same, and the thickness of the plurality of second guide ribs 5 is the same.

[0172] The duct air conditioner provided by the utility model increases the flow resistance of the leakage airflow between the centrifugal wind wheel 32 and the side plate of the volute 31 by means of the first guide structure and the second guide structure arranged on the volute 31, wherein the second guide structure is located between the first guide structure and the edge of the air inlet 311, reduces the leakage loss between the centrifugal wind wheel 32 and the volute 31, improves the efficiency of the centrifugal fan 3, improves the turbulence degree of the fluid at the air inlet 311 of the centrifugal fan 3, reduces the noise and vibration of the centrifugal fan 3, and thus improves the overall performance of the duct air conditioner.

[0173] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0174] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A duct machine, characterized in that: include: A casing, wherein an air inlet cavity and a heat exchange cavity arranged along the width direction of the casing are defined therein, the casing comprising an air inlet and an air outlet, the air inlet is communicated with the air inlet cavity, and the air outlet is communicated with the heat exchange cavity; A heat exchanger is disposed in the heat exchange cavity and performs heat exchange on the air entering the heat exchange cavity; A volute, disposed in the air inlet cavity, the volute comprising an air inlet and an air outlet that are connected, the air inlet being disposed on an end plate of the volute and connected to the air inlet cavity, and the air outlet being connected to the heat exchange cavity; A centrifugal fan wheel is arranged in the volute, and the centrifugal fan wheel drives air from the air inlet through the volute to the heat exchange cavity by rotation, and is sent out from the air outlet after heat exchange in the heat exchanger; A first flow guide structure is provided on the side of the end plate facing the centrifugal wind wheel, and the first flow guide structure surrounds the air inlet; A second flow guiding structure, surrounding the air inlet and located between the first flow guiding structure and the air inlet; The first flow guiding structure has a plurality of discontinuous first flow guiding ribs, and the second flow guiding structure has a plurality of discontinuous second flow guiding ribs, and the plurality of first flow guiding ribs and the plurality of second flow guiding ribs are staggered in distribution.

2. A duct machine, characterized in that: include: A casing, wherein an air inlet cavity and a heat exchange cavity arranged along the width direction of the casing are defined therein, the casing comprising an air inlet and an air outlet, the air inlet is communicated with the air inlet cavity, and the air outlet is communicated with the heat exchange cavity; A heat exchanger is disposed in the heat exchange cavity and performs heat exchange on the air entering the heat exchange cavity; A volute, disposed in the air inlet cavity, the volute comprising an air inlet and an air outlet that are connected, the air inlet being disposed on an end plate of the volute and connected to the air inlet cavity, and the air outlet being connected to the heat exchange cavity; A centrifugal fan wheel is arranged in the volute, and the centrifugal fan wheel drives air from the air inlet through the volute to the heat exchange cavity by rotation, and is sent out from the air outlet after heat exchange in the heat exchanger; A first flow guide structure is provided on the side of the end plate facing the centrifugal wind wheel, and the first flow guide structure surrounds the air inlet; The first flow guiding structure has a plurality of discontinuous first flow guiding ribs; a second flow-guiding structure, surrounding the air inlet and located between the first flow-guiding structure and the air inlet, the second flow-guiding structure having a plurality of discontinuous second flow-guiding ribs; The first flow guiding structures and the second flow guiding structures are alternately distributed, so that the first flow guiding ribs and the second flow guiding ribs are staggeredly distributed.

3. The air duct machine according to claim 1 or 2, characterized in that: An air guide ring is disposed at the edge of the air inlet. In the axial direction of the centrifugal wind wheel, the height of the air guide ring is greater than the height of the first guide rib and the second guide rib.

4. The air duct machine according to claim 1 or 2, characterized in that: In the radial direction of the centrifugal wind wheel, the outer dimension of the first flow guide structure is not less than the outer diameter dimension of the blades of the centrifugal wind wheel.

5. The air duct machine according to claim 4, characterized in that: In the radial direction of the centrifugal wind wheel, the outer dimension of the second flow guide structure is not less than the inner diameter dimension of the blades of the centrifugal wind wheel.

6. The air duct machine according to claim 1 or 2, characterized in that: The straight-line distance between two adjacent ends of the first guide ribs that are close to each other is not less than 10 mm.

7. The air duct machine according to claim 1 or 2, characterized in that: The ratio of the thickness of the first guide rib and / or the second guide rib to the thickness of the end plate where the first guide rib and / or the second guide rib are located is 0.6 to 0.

8.

8. A centrifugal fan, characterized in that: include: A volute, the volute comprising an air inlet and an air outlet connected to each other, the air inlet being arranged on an end plate of the volute; A centrifugal fan wheel is arranged in the volute, and the centrifugal fan wheel drives air to be introduced into the volute from the air inlet through rotation, and is sent out from the air outlet; A first flow guide structure is provided on the side of the end plate facing the centrifugal wind wheel, and the first flow guide structure surrounds the air inlet; a second flow guiding structure surrounding the air inlet and located between the first flow guiding structure and the air inlet; The first flow guiding structure has a plurality of discontinuous first flow guiding ribs, and the second flow guiding structure has a plurality of discontinuous second flow guiding ribs, and the plurality of the first flow guiding ribs and the plurality of the second flow guiding ribs are staggered in distribution; The first flow guiding structure, the second flow guiding structure and the centrifugal wind wheel are arranged concentrically.

9. The centrifugal fan according to claim 8, characterized in that: A plurality of the first guide ribs are arranged at intervals along a first circumferential direction, and a plurality of the second guide ribs are arranged at intervals along a second circumferential direction.

10. The centrifugal fan according to claim 8 or 9, characterized in that: In the radial direction of the centrifugal wind wheel, the second guide rib and two adjacent first guide ribs have an overlapping area.

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