Centrifugal fan and duct type air conditioner

Abstract

The utility model provides a centrifugal fan and a duct type air conditioner, and relates to the technical field of air conditioners, the centrifugal fan comprises a driving motor, two impellers and a speed regulation transmission mechanism, the speed regulation transmission mechanism is provided with an input end and two output ends, the input end is in transmission connection with the driving motor, and the output ends are in transmission connection with the impellers in a one-to-one correspondence mode. The driving motor is in transmission connection with the two impellers through the speed regulation transmission mechanism, differential speed regulation between the two output ends can be achieved through the speed regulation transmission mechanism, and automatic distribution of the rotating speed between the two output ends is achieved. The speed regulation transmission mechanism can reduce the rotating speed output by the output end corresponding to the speed regulation transmission mechanism and increase the rotating speed output by the other output end, so that the resistance of one impeller in the centrifugal fan is increased, the rotating speed of the other impeller is increased, it is guaranteed that the wind speed output by the other impeller is increased, and the wind speed of the centrifugal fan is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to a centrifugal fan and a ducted air conditioner. BACKGROUND

[0002] In the current blowing type ducted air conditioner, the centrifugal fan in the ducted air conditioner mostly adopts a double-shaft motor, the left and right ends of the double-shaft motor each have a motor shaft, the double-shaft motor simultaneously drives the two motor shafts, and the motor shafts at the left and right ends of the double-shaft motor are respectively connected with independent impellers.

[0003] The two impellers of the centrifugal fan correspond to the air outlet of the ducted air conditioner, and the air outlet of the ducted air conditioner is provided with an air valve, which meets the demand for air supply to different rooms by controlling the sectional area of the air outlet of the ducted air conditioner.

[0004] When the air outlet of the ducted air conditioner is blocked by the air valve, the resistance received by one impeller increases, the resistance received by the other impeller remains unchanged, when the motor maintains the current power, the resistance received by the motor shaft at one end of the motor increases, thereby increasing the resistance received by the motor, so that the rotational speed of the motor shafts at both ends of the motor is reduced, thereby reducing the rotational speed of the other impeller, reducing the air speed of the other impeller, and further reducing the air speed of the entire centrifugal fan. CONTENT OF THE INVENTION

[0005] The present application provides a centrifugal fan and a ducted air conditioner to solve the technical problem that when the resistance received by one impeller increases and the resistance received by the other impeller remains unchanged in the existing centrifugal fan, the rotational speed of the other impeller is reduced.

[0006] A first aspect of the embodiment of the present application provides a centrifugal fan, comprising:

[0007] a driving motor;

[0008] two impellers;

[0009] a speed regulation transmission mechanism having an input end and two output ends, the input end is in transmission connection with the driving motor, each of the output ends is in one-to-one transmission connection with each of the impellers, and the speed regulation transmission mechanism is configured to, when the resistance received by one of the impellers increases, reduce the rotational speed output by the output end corresponding thereto, and increase the rotational speed output by the other output end, so as to increase the rotational speed of the other impeller.

[0010] In a possible implementation manner, the speed regulation transmission mechanism comprises a first gear, a speed regulation assembly and two second gears, the first gear is arranged on the motor shaft of the driving motor, the first gear forms the input end, the first gear is in transmission connection with each of the second gears through the speed regulation assembly, and the second gears form the output ends.

[0011] In a possible implementation, the second gear is a bevel gear, the speed regulation assembly comprises a third gear, a planetary gear carrier and at least one planetary gear, the third gear is rotationally connected to the impeller shaft of the impeller, and the third gear is engaged with the first gear, the planetary gear carrier is fixed on the third gear, each planetary gear is arranged on the planetary gear carrier, and each bevel gear is engaged with the planetary gear.

[0012] In a possible implementation, the centrifugal fan further comprises a first coupling, a first half shaft, a second coupling and a second half shaft, the impeller shaft of one of the impellers is connected to one end of the first half shaft through the first coupling, the other end of the first half shaft is fixedly connected to one of the bevel gears, the impeller shaft of the other of the impellers is connected to one end of the second half shaft through the second coupling, and the other end of the second half shaft is fixedly connected to the other of the bevel gears.

[0013] In a possible implementation, the centrifugal fan further comprises a motor support and a coupling mounting rack, the driving motor is fixed on the motor support, and the first coupling and the second coupling are both fixed on the coupling mounting rack.

[0014] In a possible implementation, the driving motor is located between the two impellers.

[0015] A second aspect of the embodiments of the present application provides a ducted air conditioner, comprising a shell, and further comprising the centrifugal fan according to any one of the above.

[0016] In a possible implementation, the centrifugal fan further comprises a partition plate, the partition plate is arranged in the shell to divide an inner cavity of the shell into a heat exchange chamber and a supply air chamber, an evaporator is arranged in the heat exchange chamber, the centrifugal fan is arranged in the supply air chamber, the partition plate is provided with a first air vent and a second air vent, an air outlet end of one of the impellers of the centrifugal fan is in communication with the first air vent, and an air outlet end of the other of the impellers of the centrifugal fan is in communication with the second air vent.

[0017] In a possible implementation, the driving motor of the centrifugal fan is fixed on the partition plate, and a motor shaft of the driving motor is perpendicular to the partition plate.

[0018] In a possible implementation, the driving motor is located between the first air vent and the second air vent, and the driving motor is a flat motor.

[0019] The centrifugal fan provided by the application comprises a driving motor, two impellers and a speed regulation transmission mechanism. The speed regulation transmission mechanism has an input end and two output ends. The input end is in driving connection with the driving motor, and each output end is in one-to-one driving connection with each impeller. The speed regulation transmission mechanism is configured to, when the resistance received by one impeller increases, reduce the rotating speed of the output end corresponding to the impeller and increase the rotating speed of the output end of the other impeller, so as to increase the rotating speed of the other impeller. In the centrifugal fan of the application, the driving motor is in driving connection with the two impellers through the speed regulation transmission mechanism. The speed regulation transmission mechanism can realize differential speed regulation between the two output ends and automatic distribution of the rotating speed between the two output ends. Therefore, when one impeller is blocked, the speed regulation transmission mechanism will reduce the rotating speed of the output end corresponding to the impeller and increase the rotating speed of the output end of the other impeller, so that the rotating speed of the other impeller is increased, the wind speed output by the other impeller is ensured to be increased, and the wind speed of the centrifugal fan is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0021] Figure 1 A structural schematic diagram of a centrifugal fan provided for an embodiment of the application;

[0022] Figure 2 A structural schematic diagram of a speed regulation transmission mechanism in a centrifugal fan provided for an embodiment of the application;

[0023] Figure 3 A structural schematic diagram of a centrifugal fan provided for an embodiment of the application; Figure 1 A structural schematic diagram from another angle;

[0024] Figure 4 A structural schematic diagram of a ducted fan provided for an embodiment of the application.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 10 - shell; 11 - heat exchange chamber; 12 - air supply chamber;

[0027] 20 - partition plate; 21 - first air vent; 22 - second air vent;

[0028] 100 - driving motor;

[0029] 200 - impeller; 210 - impeller shaft;

[0030] 300 - motor support;

[0031] 400 - speed regulation transmission mechanism; 410 - input end; 420 - output end; 430 - speed regulation assembly; 431 - third gear; 432 - planetary gear carrier; 433 - planetary gear;

[0032] 500 - first coupling;

[0033] 600 - first half shaft;

[0034] 700 - second coupling;

[0035] 800 - second half shaft;

[0036] 900 - coupling mounting bracket.

[0037] The specific embodiments of the present application have been shown by way of example in the above figures, and will be described in more detail hereafter. These figures and the written description are not to be construed as limiting the scope of the present application in any way, but are merely to illustrate specific embodiments of the present application. DETAILED DESCRIPTION

[0038] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements, unless the context clearly dictates otherwise. The following description is not to be construed as limiting as to all embodiments consistent with the present application, but rather is intended to explain certain exemplary embodiments consistent with the present application. Based on the description as provided herein, departing from the spirit of the application, those skilled in the art will be able to devise alternative embodiments consistent with the present application, which are to be considered within the scope of the present application.

[0039] It should be noted that all directional indications, such as upper, lower, left, right, front, rear, etc., are merely used to explain the relative locations between the components shown in the specific attitude (as shown in the drawings) and the movement conditions, etc., and if the specific attitude changes, the directional indications will also change accordingly.

[0040] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0042] In the current blowing type duct type air conditioner, the centrifugal fan in the duct type air conditioner mostly uses a double-shaft motor. The left and right ends of the double-shaft motor have motor shafts. The double-shaft motor simultaneously drives the two motor shafts. The motor shafts at the left and right ends of the double-shaft motor are respectively connected with independent impellers.

[0043] The two impellers of the centrifugal fan correspond to the air outlet of the duct type air conditioner. The air outlet of the duct type air conditioner is provided with an air valve. The air valve meets the demand for air supply to different rooms by controlling the cross-sectional area of the air outlet of the duct type air conditioner.

[0044] When the air outlet of the duct type air conditioner is blocked by the air valve, the resistance received by one impeller will increase, and the resistance received by the other impeller will remain unchanged. When the motor maintains the current power, the resistance received by the motor shaft at one end of the motor will increase, thereby increasing the resistance received by the motor, and the rotational speeds of the motor shafts at both ends of the motor will be reduced, thereby reducing the rotational speed of the other impeller, reducing the air speed of the other impeller, and further reducing the air speed of the entire centrifugal fan. In addition, the resistance received by the entire motor is increased, thereby affecting the service life and reliability of the entire motor, and reducing the service life and reliability of the centrifugal fan.

[0045] In order to solve the technical problem that when the resistance received by one impeller increases and the resistance received by the other impeller remains unchanged in the existing centrifugal fan, the rotational speed of the other impeller will be reduced, the present application proposes a centrifugal fan and a duct type air conditioner. The centrifugal fan comprises a driving motor, two impellers and a speed regulation transmission mechanism. The speed regulation transmission mechanism has an input end and two output ends. The input end is in transmission connection with the driving motor. Each output end is in one-to-one transmission connection with each impeller. The speed regulation transmission mechanism is configured to, when the resistance received by one impeller increases, reduce the rotational speed output by the output end corresponding to the one impeller, and increase the rotational speed output by the other output end, so as to increase the rotational speed of the other impeller.

[0046] In the centrifugal fan of the application, the driving motor is connected with the two impellers through the speed regulation transmission mechanism, the speed regulation transmission mechanism can realize differential speed regulation between the two output ends, realize automatic distribution of the rotating speed between the two output ends, so that when one impeller is blocked, the speed regulation transmission mechanism will reduce the rotating speed of the output end corresponding to the blocked impeller and increase the rotating speed of the output end of the other impeller, so that the rotating speed of the other impeller is increased, the wind speed output by the other impeller is ensured to be increased, the wind speed of the centrifugal fan is ensured, and the driving motor is prevented from being blocked due to the increase of the resistance of the single impeller or the impeller, thereby improving the service life and reliability of the driving motor, and improving the service life and reliability of the centrifugal fan.

[0047] The technical solutions of the application will be described in detail below with reference to the drawings and specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described in detail in some embodiments.

[0048] Referring to Figures 1 to 4 , the embodiment of the application provides a centrifugal fan, which comprises a driving motor 100, two impellers 200 and a speed regulation transmission mechanism 400. Figure 1 The structure schematic diagram of the centrifugal fan provided by the embodiment of the application is shown in Figure 2 The structure schematic diagram of the speed regulation transmission mechanism in the centrifugal fan provided by the embodiment of the application is shown in Figure 3 The structure schematic diagram of the centrifugal fan provided by the embodiment of the application is shown in Figure 1 The structure schematic diagram from another angle is shown in Figure 4 The structure schematic diagram of the air duct machine provided by the embodiment of the application is shown in

[0049] In the embodiment of the application, referring to Figures 1 to 3 , the embodiment of the application provides a centrifugal fan, which comprises a driving motor 100, two impellers 200 and a speed regulation transmission mechanism 400.

[0050] The speed regulation transmission mechanism 400 has an input end 410 and two output ends 420, the input end 410 is connected with the driving motor 100 in transmission, each output end 420 is connected with each impeller 200 in transmission one by one, and the speed regulation transmission mechanism 400 is configured to, when the resistance received by one impeller 200 increases, reduce the rotating speed of the output end 420 corresponding to the blocked impeller and increase the rotating speed of the output end 420 of the other impeller 200, so as to increase the rotating speed of the other impeller 200.

[0051] In the embodiment of the application, the driving motor 100 has a motor shaft, the impeller 200 comprises impeller blades, an impeller cover and an impeller shaft, the impeller cover can be a volute, and driving the impeller shaft to rotate can drive the impeller blades to rotate, so as to realize blowing.

[0052] The speed regulation transmission mechanism 400 can realize differential regulation between the two output ends 420, realize automatic distribution of the rotation speeds of the two output ends 420, ensure that the rotation speed of the output end 420 is reduced when the output end 420 is blocked, and ensure that the rotation speed of the output end 420 is increased, and at this time, the rotation speed of the motor shaft output of the driving motor 100 is unchanged, so that the resistance received by the driving motor 100 is not increased, and the service life and reliability of the driving motor 100 are improved.

[0053] In the centrifugal fan of the present application, the driving motor 100 is connected to the two impellers 200 through the speed regulation transmission mechanism 400, so that when one impeller 200 is blocked, the speed regulation transmission mechanism 400 reduces the rotation speed of the corresponding output end 420 and increases the rotation speed of the other output end 420, so that the rotation speed of the other impeller 200 is increased, the output air speed of the other impeller is ensured to be increased, the air output of the centrifugal fan is ensured, and the driving motor 100 is prevented from being blocked due to the increase in resistance of the single impeller 200, thereby improving the service life and reliability of the driving motor 100 and the centrifugal fan.

[0054] In another embodiment, referring to Figure 2 The speed regulation transmission mechanism 400 includes a first gear, a speed regulation assembly 430, and two second gears, the first gear is arranged on the motor shaft of the driving motor 100, the first gear forms the input end 410, the first gear is connected to each second gear through the speed regulation assembly 430, and the second gear forms the output end 420.

[0055] In this embodiment, the rotation speed between the two second gears is adjusted through the speed regulation assembly 430, when the resistance of one impeller 200 is increased, the rotation speed of the second gear corresponding to the impeller 200 with increased resistance is reduced through the adjustment of the speed regulation assembly 430, and the rotation speed of the other second gear is increased, so that the rotation speed of the other impeller 200 is increased.

[0056] In some embodiments, referring to Figure 2 The second gear is a bevel gear, the speed regulation assembly 430 includes a third gear 431, a planetary gear carrier 432, and at least one planetary gear 433, the third gear 431 is rotatably connected to the impeller shaft 210 of the impeller 200, the third gear 431 is engaged with the first gear, the planetary gear carrier 432 is fixed on the third gear 431, each planetary gear 433 is arranged on the planetary gear carrier 432, and each bevel gear is engaged with the planetary gear 433.

[0057] In this embodiment, the drive motor 100 drives the motor shaft to rotate, the rotation of the motor shaft drives the first gear to rotate, the rotation of the first gear drives the third gear 431 to rotate, the third gear 431 is rotatably connected to the impeller shaft 210, that is, the third gear 431 can rotate relative to the impeller shaft 210, that is, when the third gear 431 rotates, the impeller shaft 210 remains stationary.

[0058] Specifically, the third gear 431 can be connected to the impeller shaft 210 via a bearing.

[0059] The bevel gear forms the output end 420 of the speed regulating transmission mechanism 400, and the first gear forms the input end 410 of the speed regulating transmission mechanism 400. When the third gear 431 rotates, it will drive the planetary gear carrier 432 to rotate. When the planetary gear carrier 432 rotates, it will drive the planetary gear 433 on the planetary gear carrier 432 to rotate along the rotation axis of the planetary gear carrier 432. That is, at this time, the planetary gear 433 revolves. Since the planetary gear 433 meshes with two bevel gears respectively, the planetary gear 433 will drive the two bevel gears to rotate, thereby driving the two impeller shafts 210 to rotate, so that the two impellers 200 blow air.

[0060] When the resistance of one impeller 200 increases, the resistance of the corresponding impeller shaft 210 also increases, which in turn increases the resistance of the corresponding bevel gear. When the resistance of the bevel gear increases, the rotation speed of the planetary gear 433 will increase. The rotation of the planetary gear 433 will transfer more power to the side with less resistance, that is, reduce the output speed of the bevel gear corresponding to the impeller 200 with increased resistance, and increase the output speed of the other bevel gear.

[0061] Furthermore, the speed control transmission mechanism 400 can be a differential.

[0062] In another embodiment, reference is made to Figure 2 As shown, it also includes a first coupling 500, a first half-shaft 600, a second coupling 700, and a second half-shaft 800. The impeller shaft 210 of one impeller 200 is connected to one end of the first half-shaft 600 through the first coupling 500, and the other end of the first half-shaft 600 is fixedly connected to a bevel gear. The impeller shaft 210 of the other impeller 200 is connected to one end of the second half-shaft 800 through the second coupling 700, and the other end of the second half-shaft 800 is fixedly connected to another bevel gear.

[0063] In this embodiment, a first coupling 500 enables a detachable connection between one impeller shaft 210 and the first half-shaft 600, and a second coupling 700 enables a detachable connection between the other impeller shaft 210 and the second half-shaft 800. When one impeller 200 is damaged, the damaged impeller 200 can be removed separately without disassembling and replacing the entire centrifugal fan, thus reducing maintenance costs.

[0064] The existing centrifugal fan needs to disassemble the whole centrifugal fan when one impeller or double-shaft motor is damaged, but the centrifugal fan of the embodiment only needs to disassemble one impeller or driving motor 100, thereby improving the maintenance efficiency and reducing the maintenance cost.

[0065] In some embodiments, the motor support 300 and the coupling mounting bracket 900 are further included, the driving motor 100 is fixed on the motor support 300, the first coupling 500 and the second coupling 700 are both fixed on the coupling mounting bracket 900, and the coupling mounting bracket 900 is fixed on the motor support 300.

[0066] In the embodiment, the coupling mounting bracket 900 is fixed on the motor support 300, and when the centrifugal fan is installed in a designated position, such as a ducted fan, only the motor support 300 needs to be installed in the ducted fan, without the need to install the coupling mounting bracket 900 in the ducted fan, thereby improving the installation efficiency.

[0067] And the coupling mounting bracket 900 is fixed on the motor support 300, thereby improving the integrity of the whole centrifugal fan and ensuring the stability of the coupling mounting bracket 900.

[0068] In another possible embodiment, the driving motor 100 is located between the two impellers 200.

[0069] In the embodiment, the driving motor 100 is located between the two impellers 200, thereby improving the effective air return area of the two impellers 200.

[0070] The second aspect of the embodiment provides a ducted fan, which includes a shell 10 and further includes the centrifugal fan of any one of the above embodiments, and the centrifugal fan is arranged in the shell 10.

[0071] The shell 10 of the ducted fan of the embodiment includes the centrifugal fan of the embodiment, the centrifugal fan includes a driving motor, two impellers and a speed regulation transmission mechanism 400, the speed regulation transmission mechanism 400 has an input end 410 and two output ends 420, the input end 410 is in transmission connection with the driving motor 100, each output end 420 is in one-to-one transmission connection with each impeller 200, and the speed regulation transmission mechanism 400 is configured to, when the resistance received by one impeller 200 increases, reduce the rotation speed output by the corresponding output end 420 and increase the rotation speed output by the other output end 420, so as to improve the rotation speed of the other impeller 200.

[0072] The centrifugal fan of the present application, the driving motor 100 is connected with two impellers 200 through the speed regulation transmission mechanism 400, so that when one impeller 200 is blocked, the speed regulation transmission mechanism 400 will reduce the rotating speed of the corresponding output end 420 and increase the rotating speed of the other output end 420, so that the rotating speed of the other impeller is increased when the rotating speed of one impeller is increased, the wind speed output by the other impeller is ensured to be increased, the air volume of the centrifugal fan is ensured, and the driving motor 100 is prevented from being blocked due to the increase of the resistance of one impeller 200, thereby prolonging the service life and reliability of the driving motor 100 and the centrifugal fan.

[0073] In other embodiments, referring to Figure 3 and Figure 4 , further comprising a partition plate 20 arranged in the shell 10 to divide the inner cavity of the shell 10 into a heat exchange chamber 11 and a air supply chamber 12, the evaporator is arranged in the heat exchange chamber 11, and the centrifugal fan is arranged in the air supply chamber 12, the partition plate 20 is provided with a first air vent 21 and a second air vent 22, the air outlet end of one impeller 200 of the centrifugal fan is communicated with the first air vent 21, and the air outlet end of the other impeller 200 of the centrifugal fan is communicated with the second air vent 22.

[0074] In the embodiment, the partition plate 20 divides the inner cavity of the shell 10 into the heat exchange chamber 11 and the air supply chamber 12, the evaporator is arranged in the heat exchange chamber 11, and the centrifugal fan of the present application is arranged in the air supply chamber 12, one impeller 200 of the centrifugal fan is communicated with the first air vent 21 on the partition plate 20, and the other impeller 200 of the centrifugal fan is communicated with the second air vent 22 on the partition plate 20, so that the air blown by one impeller 200 is blown to the evaporator in the heat exchange chamber 11 through the first air vent 21, heat exchange is performed at the evaporator, and finally the air is blown to the indoor through the air pipe system, and the air blown by the other impeller 200 is blown to the evaporator in the heat exchange chamber 11 through the second air vent 22, heat exchange is performed at the evaporator, and finally the air is blown to the indoor through the air pipe system.

[0075] In another possible embodiment, referring to Figure 1 , the driving motor 100 of the centrifugal fan is fixed on the partition plate 20, and the motor shaft of the driving motor 100 is perpendicular to the partition plate 20.

[0076] The motor shaft of the dual-shaft motor of the existing centrifugal fan is parallel to the partition plate 20, so that the dual-shaft motor can be connected to the impellers at the left and right ends. In the embodiment, the motor shaft of the driving motor 100 is perpendicular to the partition plate 20. The vertical motor shaft occupies a shorter distance in the length direction of the impeller shaft than the parallel motor shaft, so that the distance between the two impellers can be shorter. In the same volume, the length of the impeller can be extended, so that the volume of the impeller is increased, thereby increasing the effective air return area of the impeller, and improving the air supply of the duct fan under the same static pressure and rotational speed.

[0077] Further, the existing dual-shaft motor occupies a larger space between the two impellers, while the motor shaft of the driving motor 100 is perpendicular to the partition plate 20, so that the driving motor 100 occupies a smaller space between the two impellers than the existing one, thereby increasing the air suction volume of the two impellers.

[0078] Further, the driving motor 100 is arranged in the heat exchange chamber 11, and the motor shaft of the driving motor 100 is in transmission connection with the input end 410 of the speed regulation transmission mechanism 400 through the partition plate 20.

[0079] In the embodiment, since the driving motor 100 is arranged in the heat exchange chamber 11, the space in the air supply chamber 12 is increased, and the volume of the impeller can be further increased, thereby improving the air supply, and of course, the volume of the air supply chamber 12 can be reduced, so that the air supply chamber 12 is more compact.

[0080] In an embodiment, the driving motor 100 is located between the first air vent 21 and the second air vent 22, and the driving motor 100 is a flat motor.

[0081] In the embodiment, the driving motor 100 is a flat motor, so that the floor area of the driving motor 100 is further reduced, the effective air return area of the impeller is increased, and the air supply of the duct fan is improved.

[0082] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0083] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is indicated only by the appended claims.

Claims

1. A centrifugal fan characterized by comprising: The centrifugal fan comprises: a driving motor (100); two impellers (200); a speed-regulating transmission mechanism (400) having an input end (410) and two output ends (420), the input end (410) being in transmission connection with the driving motor (100), each of the output ends (420) being in one-to-one transmission connection with each of the impellers (200), the speed-regulating transmission mechanism (400) being configured to, when the resistance received by one of the impellers (200) increases, reduce the rotating speed output by the output end (420) corresponding to the impeller (200) and increase the rotating speed output by the other output end (420) so as to increase the rotating speed of the other impeller (200).

2. The centrifugal fan of claim 1, wherein The speed-regulating transmission mechanism (400) comprises a first gear, a speed-regulating assembly (430) and two second gears, the first gear being arranged on the motor shaft of the driving motor (100), the first gear forming the input end (410), the first gear being in transmission connection with each of the second gears through the speed-regulating assembly (430), the second gears forming the output ends (420).

3. The centrifugal fan of claim 2, wherein The second gears are bevel gears, the speed-regulating assembly (430) comprising a third gear (431), a planetary gear carrier (432) and at least one planetary gear (433), the third gear (431) being in rotational connection with the impeller shaft (210) of the impeller (200), the third gear (431) being in meshing connection with the first gear, the planetary gear carrier (432) being fixed on the third gear (431), each of the planetary gears (433) being arranged on the planetary gear carrier (432), each of the bevel gears being in meshing connection with the planetary gears (433).

4. The centrifugal fan of claim 3, wherein Further comprising a first coupling (500), a first half shaft (600), a second coupling (700) and a second half shaft (800), the impeller shaft (210) of one of the impellers (200) being connected with one end of the first half shaft (600) through the first coupling (500), the other end of the first half shaft (600) being fixedly connected with one of the bevel gears, the impeller shaft (210) of the other impeller (200) being connected with one end of the second half shaft (800) through the second coupling (700), the other end of the second half shaft (800) being fixedly connected with the other bevel gear.

5. The centrifugal fan of claim 4, wherein Further comprising a motor support (300) and a coupling mounting rack (900), the driving motor (100) being fixed on the motor support (300), the first coupling (500) and the second coupling (700) being fixed on the coupling mounting rack (900), the coupling mounting rack (900) being fixed on the motor support (300).

6. The centrifugal fan according to any one of claims 1 to 5, characterized in that The driving motor (100) is located between the two impellers (200).

7. A ducted fan machine comprising a housing (10) characterised in that, Further comprising the centrifugal fan according to any one of claims 1 to 6, the centrifugal fan being arranged in the shell (10).

8. The ducted fan machine according to claim 7, wherein, Further comprising a partition plate (20) arranged in the shell (10) to divide the inner cavity of the shell (10) into a heat exchange chamber (11) and a supply air chamber (12), the evaporator is arranged in the heat exchange chamber (11), the centrifugal fan is arranged in the supply air chamber (12), the partition plate (20) is provided with a first air vent (21) and a second air vent (22), the air outlet end of one of the impellers (200) of the centrifugal fan is communicated with the first air vent (21), and the air outlet end of the other of the impellers (200) of the centrifugal fan is communicated with the second air vent (22).

9. The ducted fan machine according to claim 8, wherein, The driving motor (100) of the centrifugal fan is fixed on the partition plate (20), and the motor shaft of the driving motor (100) is perpendicular to the partition plate (20).

10. The ducted fan machine according to claim 8 or 9, wherein, The driving motor (100) is located between the first air vent (21) and the second air vent (22), and the driving motor (100) is a flat motor.

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