Centrifugal fan

Abstract

The centrifugal fan comprises an impeller, a flow guide cover and a motor, the impeller comprises a rear wheel disc and a front wheel disc, a mounting hole used for mounting the motor is formed in the center of the rear wheel disc, an air inlet is formed in the center of the front wheel disc, the flow guide cover is mounted at the air inlet, a plurality of fan blades are mounted between the rear wheel disc and the front wheel disc, and an air channel is formed between every two adjacent fan blades. The centrifugal fan is characterized by further comprising a controller, an annular groove is formed between the flow guide cover and the front wheel disc, and the controller is fixed to the flow guide cover and located in the annular groove. The heat dissipation mode of the motor controller is upgraded from passive heat dissipation to active heat dissipation, so that the heat dissipation capability is greatly improved; due to the fact that the heat dissipation capacity is improved, the motor and the controller can be applied and set to be higher in power section in a limited space.

Description

Technical Field

[0001] This utility model relates to a centrifugal fan. Background Technology

[0002] One of the core components of the EC external rotor motor used in current centrifugal fans is the motor controller. Typically, a controller such as... Figure 1 The integrated structure shown places the motor controller at the rear of the motor, so as not to affect the normal operation of the fan.

[0003] The controller's heat dissipation requirements are directly proportional to the motor's power consumption. Therefore, based on the application temperature requirements of the components, numerous heat dissipation fins are arranged on the control box to increase the heat dissipation area. Due to the working characteristics of centrifugal fans, the airflow has minimal disturbance to the rear end of the motor. Therefore, integrated controller solutions for centrifugal fans can only employ passive cooling. However, passive cooling has limited dissipation capacity and efficiency, which greatly restricts the upper limit of motor power and makes it difficult to achieve a compact, high-power control design.

[0004] As market demands for centrifugal fan performance increase, the required motor power also grows. Meanwhile, the need for aesthetically pleasing designs, integrated cabinets, and miniaturization necessitates increasingly smaller installation spaces. Consequently, passive cooling motor solutions are ill-suited for the high-performance centrifugal fan market. Summary of the Invention

[0005] The purpose of this invention is to provide a centrifugal fan that solves the technical problem that, as the performance requirements of centrifugal fans become increasingly demanding, passive cooling motor solutions are no longer suitable for the high-performance market environment of centrifugal fans.

[0006] The technical solution of this utility model is implemented as follows:

[0007] This utility model provides a centrifugal fan, including an impeller, a guide vane, and a motor. The impeller includes a rear impeller and a front impeller. The rear impeller has a mounting hole at its center for mounting the motor, and the front impeller has an air inlet at its center. The guide vane is installed at the air inlet. Several fan blades are installed between the rear and front impellers, and an air duct is formed between two adjacent fan blades. An air outlet is formed at the outer edge of the air duct. The feature is that it also includes a controller. An annular groove is formed between the guide vane and the front impeller, and the controller is fixed on the guide vane and located in the annular groove.

[0008] The controller described above includes a housing, a control circuit board, electronic components, and a heat-conducting plate. The electronic components are mounted on one end face of the control circuit board, and the other end face of the control circuit board is in close contact with the heat-conducting plate. The heat-conducting plate is mounted on the housing, and the control circuit board and electronic components are placed inside the housing. The housing is fixed on the air guide cover.

[0009] The aforementioned housing includes a base plate and side plates extending axially from both sides of the base plate. The base plate is arc-shaped, and a connecting plate is provided at the outer edge of the base plate and the side plates to connect them together. A cavity is formed between the connecting plate, the base plate, and the side plates. A heat-conducting plate is installed on the top of the side plates and the connecting plate, and the control circuit board and electronic components are placed inside the cavity.

[0010] The top of each of the two side plates described above is provided with a mounting plate, which is fixed to the air guide cover.

[0011] A centrifugal fan includes an impeller, a guide vane, and a motor. The impeller includes a rear impeller and a front impeller. The rear impeller has a mounting hole at its center for mounting the motor, and the front impeller has an air inlet at its center. The guide vane is installed at the air inlet. Several fan blades are installed between the rear and front impellers, forming an air duct between adjacent fan blades. An air outlet is formed at the outer edge of the air duct. The fan is characterized by further including a controller. An annular groove is formed between the guide vane and the front impeller. The guide vane has a notch. The controller is fixed at the notch of the guide vane and is located in the annular groove. The end face of the controller is exposed through the notch of the guide vane.

[0012] The controller described above includes a housing, a control circuit board, electronic components, and a heat-conducting plate. The electronic components are mounted on one end face of the control circuit board, and the other end face of the control circuit board is in close contact with the heat-conducting plate. The housing is fixed on the flow guide, and the heat-conducting plate is mounted on the housing with its top surface exposed through a notch in the flow guide. The control circuit board and electronic components are placed inside the housing.

[0013] The heat-conducting plate exposed on the shroud described above has several heat dissipation ribs on its end face.

[0014] The aforementioned housing includes a base plate and side plates extending axially from both sides of the base plate. The base plate is arc-shaped, and connecting plates are provided at the outer edges of the base plate and the side plates to connect them. A cavity is formed between the connecting plates, the base plate, and the side plates. A heat-conducting plate is installed on the top of the side plates and the connecting plates, and the control circuit board and electronic components are placed inside the cavity.

[0015] The top of each of the two side plates described above is provided with a mounting plate, which is fixed to the air guide cover.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] 1. A centrifugal fan, comprising an impeller, a guide vane, and a motor, wherein the impeller includes a rear impeller and a front impeller, the rear impeller having a mounting hole at its center for mounting the motor, the front impeller having an air inlet at its center, the guide vane being installed at the air inlet, and a plurality of fan blades being installed between the rear and front impellers, forming an air duct between adjacent fan blades, and an air outlet forming at the outer edge of the air duct, characterized in that: it further includes a controller, an annular groove being formed between the guide vane and the front impeller, the controller being fixed on the guide vane and located in the annular groove. This solution effectively resolves the conflict between the application space of the centrifugal fan and the heat dissipation requirements of the controller, further compressing the axial installation space of the fan, upgrading the heat dissipation method of the motor controller from passive heat dissipation to active heat dissipation, greatly improving the heat dissipation capacity; due to the improved heat dissipation capacity, the motor and controller can be used in a limited space with higher power settings.

[0018] 2. A centrifugal fan, comprising an impeller, a guide vane, and a motor, wherein the impeller includes a rear impeller and a front impeller, the rear impeller having a mounting hole at its center for mounting the motor, the front impeller having an air inlet at its center, the guide vane being installed at the air inlet, and a plurality of fan blades being installed between the rear and front impellers, forming an air duct between adjacent fan blades, and an air outlet being formed at the outer edge of the air duct, characterized in that: it further includes a controller, an annular groove being formed between the guide vane and the front impeller, the guide vane having a notch, the controller being fixed at the notch of the guide vane, the controller being located in the annular groove, and the end face of the controller being exposed through the notch to the guide vane. This solution effectively resolves the conflict between the application space of the centrifugal fan and the heat dissipation requirements of the controller, further compressing the axial installation space of the fan, upgrading the heat dissipation method of the motor controller from passive heat dissipation to active heat dissipation, greatly improving the heat dissipation capacity; due to the improved heat dissipation capacity, the motor and controller can be used in a limited space with higher power settings.

[0019] 2. Other advantages of this utility model are described in detail in the embodiment section of the specification. Attached Figure Description

[0020] Figure 1 A perspective view provided for Embodiment 1 of this utility model;

[0021] Figure 2 Another perspective view of Embodiment 1 of this utility model;

[0022] Figure 3 An exploded view provided for Embodiment 1 of this utility model;

[0023] Figure 4 This is a schematic diagram of the controller structure provided in Embodiment 1 of the present utility model;

[0024] Figure 5 A perspective view provided for Embodiment 2 of this utility model;

[0025] Figure 6A perspective view from another angle provided for Embodiment 2 of this utility model;

[0026] Figure 7 This is an exploded view of Embodiment 2 of the present invention;

[0027] Figure 8 This is a schematic diagram of the controller structure provided in Embodiment 2 of this utility model. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] Example 1:

[0030] like Figures 1 to 4 As shown, this embodiment provides a centrifugal fan, including an impeller 1, a guide vane 2, and a motor 3. The impeller 1 includes a rear impeller 11 and a front impeller 12. The rear impeller 11 has a mounting hole at its center for mounting the motor 3, and the front impeller 12 has an air inlet 121 at its center. The guide vane 2 is installed at the air inlet 121. Several fan blades 13 are installed between the rear impeller 11 and the front impeller 12, and an air duct 14 is formed between two adjacent fan blades 13. An air outlet 141 is formed at the outer edge of the air duct 14. The feature is that it also includes a controller 4. An annular groove 10 is formed between the guide vane 2 and the front impeller 12. The controller 4 is fixed on the guide vane 2 and located in the annular groove 10. This solution effectively solves the conflict between the application space of the centrifugal fan and the heat dissipation requirements of the controller, and can further compress the axial installation space of the fan. It upgrades the heat dissipation method of the motor controller from passive heat dissipation to active heat dissipation, greatly improving the heat dissipation capacity. Due to the improved heat dissipation capacity, the motor and controller can be set to a higher power range in a limited space.

[0031] The controller 4 mentioned above includes a housing 41, a control circuit board 42, electronic components 43, and a heat-conducting plate 44. The electronic components 43 are mounted on one end face of the control circuit board 42, and the other end face of the control circuit board 42 is in close contact with the heat-conducting plate 44. The heat-conducting plate 44 is mounted on the housing 41, and the control circuit board 42 and the electronic components 43 are placed inside the housing 41. The housing 41 is fixed on the flow guide 2.

[0032] The aforementioned outer casing 41 includes a base plate 411 and side plates 412 extending axially from both sides of the base plate 411. The base plate 411 is arc-shaped, and a connecting plate 413 is provided at the outer edge of the base plate 411 and the side plates 412 to connect them together. A cavity 414 is formed between the connecting plate 413, the base plate 411, and the side plates 412. A heat-conducting plate 44 is installed on the top of the side plates 412 and the connecting plate 413. The control circuit board 42 and electronic components 43 are placed in the cavity 414. The structure is reasonably arranged, the outer casing is not a sealed structure, and the heat dissipation effect is good.

[0033] The top of each of the two side plates 412 is provided with a mounting plate 415, which is fixed on the flow guide 2. The installation structure is simple and the structure is reasonably arranged.

[0034] Example 2:

[0035] like Figures 5 to 8 As shown, a centrifugal fan includes an impeller 1, a guide vane 2, and a motor 3. The impeller 1 includes a rear impeller 11 and a front impeller 12. The rear impeller 11 has a mounting hole at its center for mounting the motor 3, and the front impeller 12 has an air inlet 121 at its center. The guide vane 2 is installed at the air inlet 121. A plurality of fan blades 13 are installed between the rear impeller 11 and the front impeller 12, and an air duct 14 is formed between two adjacent fan blades 13. An air outlet 141 is formed at the outer edge of the air duct 14. The fan is characterized by further including a controller 4, and a ring is formed between the guide vane 2 and the front impeller 12. The annular groove 10 has a notch 21 on the flow guide shroud 2. The controller 4 is fixed at the notch 21 of the flow guide shroud 2. The controller 4 is located in the annular groove 10, and the end face of the controller 4 is exposed to the flow guide shroud 2 through the notch 21. This solution effectively solves the conflict between the application space of the centrifugal fan and the heat dissipation requirements of the controller. It can further compress the axial installation space of the fan and upgrade the heat dissipation method of the motor controller from passive heat dissipation to active heat dissipation, which greatly improves the heat dissipation capacity. Due to the improved heat dissipation capacity, the motor and controller can be set to a higher power range in a limited space.

[0036] The controller 4 mentioned above includes a housing 41, a control circuit board 42, electronic components 43, and a heat-conducting plate 44. The electronic components 43 are mounted on one end face of the control circuit board 42, and the other end face of the control circuit board 42 is in close contact with the heat-conducting plate 44. The housing 41 is fixed on the flow guide 2. The heat-conducting plate 44 is mounted on the housing 41, and the top surface of the heat-conducting plate 44 is exposed to the flow guide 2 through the notch 21. The control circuit board 42 and the electronic components 43 are placed inside the housing 41. The structure is reasonably arranged, which is conducive to the heat dissipation of the controller.

[0037] The heat-conducting plate 44 exposed on the end face of the above-mentioned heat guide shroud 2 is provided with a number of heat dissipation ribs 441, which effectively improves the heat dissipation effect of the controller.

[0038] The aforementioned outer casing 41 includes a base plate 411 and side plates 412 extending axially from both sides of the base plate 411. The base plate 411 is arc-shaped, and a connecting plate 413 is provided at the outer edge of the base plate 411 and the side plates 412 to connect them together. A cavity 414 is formed between the connecting plate 413, the base plate 411, and the side plates 412. A heat-conducting plate 44 is installed on the top of the side plates 412 and the connecting plate 413. The control circuit board 42 and electronic components 43 are placed in the cavity 414. The structure is reasonably arranged, the outer casing is not a sealed structure, and the heat dissipation effect is good.

[0039] The top of each of the two side plates 412 is provided with a mounting plate 415, which is fixed on the flow guide 2. The installation structure is simple and the structure is reasonably arranged.

[0040] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited thereto. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model are equivalent substitutions and are included within the protection scope of the present utility model.

Claims

1. A centrifugal fan, comprising an impeller (1), a guide vane (2), and a motor (3), wherein the impeller (1) comprises a rear impeller disc (11) and a front impeller disc (12), the rear impeller disc (11) having a mounting hole for mounting the motor (3) at its center, the front impeller disc (12) having an air inlet (121) at its center, the guide vane (2) being installed at the air inlet (121), and a plurality of fan blades (13) being installed between the rear impeller disc (11) and the front impeller disc (12), wherein an air duct (14) is formed between two adjacent fan blades (13), and an air outlet (141) is formed at the outer edge of the air duct (14), characterized in that: It also includes a controller (4), an annular groove (10) is formed between the fairing (2) and the front wheel disc (12), and the controller (4) is fixed on the fairing (2) and located in the annular groove (10).

2. A centrifugal fan according to claim 1, characterized in that: The controller (4) includes a housing (41), a control circuit board (42), electronic components (43) and a heat-conducting plate (44). The electronic components (43) are mounted on one end face of the control circuit board (42), and the other end face of the control circuit board (42) is in close contact with the heat-conducting plate (44). The heat-conducting plate (44) is mounted on the housing (41), and the control circuit board (42) and electronic components (43) are placed inside the housing (41). The housing (41) is fixed on the flow guide (2).

3. A centrifugal fan according to claim 2, characterized in that: The outer casing (41) includes a base plate (411) and side plates (412) extending axially from both sides of the base plate (411). The base plate (411) is arc-shaped. A connecting plate (413) is provided at the outer edge of the base plate (411) and the side plates (412) to connect them together. A cavity (414) is formed between the connecting plate (413), the base plate (411) and the side plates (412). A heat-conducting plate (44) is installed on the top of the side plates (412) and the connecting plate (413). The control circuit board (42) and electronic components (43) are placed in the cavity (414).

4. A centrifugal fan according to claim 3, characterized in that: The top of each of the two side plates (412) is provided with a mounting plate (415), which is fixed on the shroud (2).

5. A centrifugal fan, comprising an impeller (1), a guide vane (2), and a motor (3), wherein the impeller (1) comprises a rear impeller (11) and a front impeller (12), the rear impeller (11) having a mounting hole for mounting the motor (3) at its center, the front impeller (12) having an air inlet (121) at its center, the guide vane (2) being installed at the air inlet (121), and a plurality of fan blades (13) being installed between the rear impeller (11) and the front impeller (12), wherein an air duct (14) is formed between two adjacent fan blades (13), and an air outlet (141) is formed at the outer edge of the air duct (14), characterized in that: It also includes a controller (4), an annular groove (10) is formed between the fairing (2) and the front wheel disc (12), the fairing (2) has a notch (21), the controller (4) is fixed at the notch (21) of the fairing (2), the controller (4) is located in the annular groove (10), and the end face of the controller (4) is exposed to the fairing (2) through the notch (21).

6. A centrifugal fan according to claim 5, characterized in that: The controller (4) includes a housing (41), a control circuit board (42), electronic components (43), and a heat-conducting plate (44). The electronic components (43) are mounted on one end face of the control circuit board (42), and the other end face of the control circuit board (42) is in close contact with the heat-conducting plate (44). The housing (41) is fixed on the flow guide (2), and the heat-conducting plate (44) is mounted on the housing (41) with its top surface exposed to the flow guide (2) through a notch (21). The control circuit board (42) and the electronic components (43) are placed inside the housing (41).

7. A centrifugal fan according to claim 6, characterized in that: Several heat dissipation ribs (441) are provided on the end face of the heat-conducting plate (44) exposed to the flow guide (2).

8. A centrifugal fan according to claim 7, characterized in that: The outer casing (41) includes a base plate (411) and side plates (412) extending axially from both sides of the base plate (411). The base plate (411) is arc-shaped. A connecting plate (413) is provided at the outer edge of the base plate (411) and the side plates (412) to connect them together. A cavity (414) is formed between the connecting plate (413), the base plate (411) and the side plates (412). A heat-conducting plate (44) is installed on the top of the side plates (412) and the connecting plate (413). The control circuit board (42) and electronic components (43) are placed in the cavity (414).

9. A centrifugal fan according to claim 8, characterized in that: The top of each of the two side plates (412) is provided with a mounting plate (415), which is fixed on the shroud (2).

Images