A centrifugal fan

Abstract

The utility model provides a centrifugal fan relates to fan technical field. The centrifugal fan includes: impeller, air deflector ring is set in above-mentioned impeller's air inlet side, and with above-mentioned impeller rotation cooperation, and drive assembly, including drive motor and support frame, above-mentioned drive motor sets in above-mentioned air deflector ring in above-mentioned impeller air inlet side, and is fixedly connected with above-mentioned air deflector ring through above-mentioned support frame, above-mentioned drive motor's output shaft is transmission connection with above-mentioned impeller. The centrifugal fan of the application has optimized the heat dissipation problem of traditional motor, realizes motor high -efficient cooling with the airflow of flowing, and has significantly reduced the overall volume.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and more specifically, to a centrifugal fan. Background Technology

[0002] A centrifugal fan is a type of fluid machinery that uses the centrifugal force generated by the rotation of an impeller to convert mechanical energy into gas kinetic energy and static pressure energy, thereby achieving gas transport. Its core structure mainly consists of a duct, an impeller, and a drive motor: the impeller is rotatably mounted inside the duct and is the core component that drives the gas flow; the drive motor is used to drive the impeller to rotate, and can be divided into two types according to the installation position: rear-mounted (located behind the air outlet of the duct) and external (located outside the duct), forming a working system of "motor drive - impeller rotation - duct guidance".

[0003] However, both installation methods have obvious limitations: the heat dissipation of the drive motor is not good; and the overall size is relatively large - the external type requires extra space to place the motor, and the rear type extends the axial dimension of the air duct, both of which increase the space occupied by the equipment.

[0004] The invention patent with application number 202510084754.8 and patent name "A Green Building Ventilation Fan" also has the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a centrifugal fan that aims to solve the technical problems in the background art.

[0006] The embodiments of this utility model are implemented as follows: This application provides a centrifugal fan, including: an impeller; a guide ring disposed on the air inlet side of the impeller and rotatably engaged with the impeller; and a drive assembly including a drive motor and a support frame, wherein the drive motor is disposed within the guide ring on the air inlet side of the impeller and is fixedly connected to the guide ring via the support frame, and the output shaft of the drive motor is drively connected to the impeller.

[0007] Furthermore, based on the aforementioned scheme, the drive motor is arranged along the axial direction of the air guide ring, and an arched shroud is provided on the side wall of the drive motor away from the impeller.

[0008] Furthermore, based on the aforementioned scheme, a mechanical seal structure is provided at the position where the output shaft protrudes from the housing of the aforementioned drive motor.

[0009] Further, based on the aforementioned scheme, the mechanical seal structure includes: an annular cavity disposed within the housing of the drive motor; wherein the output shaft passes through the annular cavity, and the annular cavity provides an input end and an output end for the output shaft to pass through; two static sealing rings are respectively fixedly disposed at the input end and the output end of the annular cavity; wherein the output shaft passes through the two static sealing rings; two dynamic sealing rings are sleeved on the output shaft located within the annular cavity and rotate synchronously with the output shaft; wherein the two dynamic sealing rings are respectively fitted with the two static sealing rings, and any one of the dynamic sealing rings can slide along the axial direction of the output shaft; and an elastic element disposed within the annular cavity, with its two ends respectively abutting against the two dynamic sealing rings.

[0010] Furthermore, based on the aforementioned scheme, the elastic element is a spring, and the spring is sleeved on the output shaft.

[0011] Furthermore, based on the aforementioned scheme, the output end of the annular cavity is provided with an opening, the opening is detachably provided with a sealing cover, and the sealing cover is provided with a through hole for the output shaft to pass through. The static sealing ring located at the output end of the annular cavity is disposed on the sealing cover.

[0012] Furthermore, based on the aforementioned scheme, a sealing gasket is provided on the mating surface between the sealing cap and the opening.

[0013] Furthermore, based on the aforementioned scheme, the arched fairing is detachably connected to the outer wall of the drive motor, and both ends of the support frame are detachably connected to the arched fairing and the air guide ring, respectively.

[0014] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects: In practical use, the centrifugal fan of this application guides airflow from the end furthest from the impeller. As the impeller rotates, a directional airflow is formed inside the guide ring. Since the drive motor is located inside the guide ring on the air inlet side of the impeller, the airflow passing through the drive motor can directly carry away the heat generated by its operation. At the same time, the drive motor directly drives the impeller to rotate through its output shaft, forming a synergistic mechanism of "built-in motor drive - impeller rotation guiding airflow - airflow self-cooling". Its advantages are: first, it optimizes the heat dissipation problem of traditional motors, achieving efficient cooling of the motor by utilizing the flowing airflow; second, the drive motor is integrated into the guide ring, eliminating the need to occupy additional space outside the air duct or behind the impeller outlet, significantly reducing the overall size, and the close-range transmission between the motor and the impeller reduces energy loss. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is an isometric view of a centrifugal fan according to an embodiment of the present invention; Figure 2 An explosion of a centrifugal fan, as described in this embodiment of the invention. Figure 1 ; Figure 3 An explosion of a centrifugal fan, as described in this embodiment of the invention. Figure 2 ; Figure 4 This is a cross-sectional view of a centrifugal fan according to an embodiment of the present utility model; Figure 5 for Figure 4 A magnified view of part A in the image; Figure 6 This is an exploded view of the drive motor in an embodiment of this utility model.

[0017] Icons: 1-Arch-shaped fairing, 2-Support frame, 3-Drive motor, 4-Guide ring, 5-Impeller, 6-Output shaft, 7-Mechanical seal structure, 701-Annular cavity, 702-Elastic element, 703-Dynamic sealing ring, 704-Static sealing ring, 8-Sealing cover, 9-Sealing gasket. Detailed Implementation

[0018] The embodiments of this application will now be described in detail with reference to the accompanying drawings. Example

[0019] Please refer to Figures 1-6 This application provides a centrifugal fan, including: an impeller 5; a guide ring 4 disposed on the air inlet side of the impeller 5 and rotatably engaged with the impeller 5; and a drive assembly including a drive motor 3 and a support frame 2. The drive motor 3 is disposed in the guide ring 4 on the air inlet side of the impeller 5 and is fixedly connected to the guide ring 4 through the support frame 2. The output shaft 6 of the drive motor 3 is drively connected to the impeller 5.

[0020] In actual use, the centrifugal fan of this application guides the airflow from the end furthest from the impeller in the guide ring 4. When the impeller 5 rotates, a directional airflow is formed inside the guide ring 4. Since the drive motor 3 is located inside the guide ring 4 on the air inlet side of the impeller 5, the airflow passing through the drive motor 3 can directly carry away the heat generated by its operation. At the same time, the drive motor 3 directly drives the impeller 5 to rotate through the output shaft 6, forming a synergistic mechanism of "built-in motor drive - impeller 5 rotation guiding airflow - airflow self-heating". Its advantages are: first, it optimizes the heat dissipation problem of traditional motors, using the flowing airflow to achieve efficient cooling of the motor; second, the drive motor 3 is integrated into the guide ring 4, without occupying additional space outside the air duct or behind the impeller outlet, significantly reducing the overall size, and the close-range transmission between the motor and the impeller 5 reduces energy loss.

[0021] In a preferred embodiment, the drive motor 3 is arranged along the axial direction of the air guide ring 4, and an arched shroud 1 is provided on the side wall of the drive motor 3 away from the impeller 5.

[0022] In the above embodiment, the arched shroud 1 on the side of the drive motor 3 away from the impeller 5 can guide the airflow smoothly around the motor surface through its streamlined curved surface, reducing the resistance loss caused by the airflow impacting the motor. This not only improves the hydrodynamic performance of the intake section, allowing more airflow energy to be converted into effective wind pressure, but also reduces noise and energy consumption caused by airflow disturbance through structured airflow guidance. At the same time, the shroud provides physical protection for the motor, preventing impurities that may be contained in the airflow from directly impacting the motor components, further ensuring the safety and stability of the equipment operation.

[0023] As a preferred embodiment, a mechanical seal structure 7 is provided at the position where the output shaft 6 protrudes from the housing of the drive motor 3.

[0024] In the above embodiments, the mechanical seal structure 7 can effectively prevent liquid from entering the motor, avoiding short circuits or component corrosion caused by liquid, thereby ensuring the safe and efficient operation of the equipment.

[0025] In a preferred embodiment, the mechanical seal structure 7 includes: an annular cavity 701 disposed within the housing of the drive motor 3; wherein the output shaft 6 passes through the annular cavity 701, and the annular cavity 701 provides an input end and an output end for the output shaft 6, respectively; two static sealing rings 704, respectively fixedly disposed at the input end and the output end of the annular cavity 701; wherein the output shaft 6 passes through the two static sealing rings 704; two dynamic sealing rings 703, sleeved on the output shaft 6 located within the annular cavity 701, and rotating synchronously with the output shaft 6; wherein the two dynamic sealing rings 703 respectively fit against the two static sealing rings 704, and any one of the dynamic sealing rings 703 can slide along the axial direction of the output shaft 6; and an elastic element 702 disposed within the annular cavity 701, with both ends abutting against the two dynamic sealing rings 703.

[0026] In the above embodiment, the elastic element 702 applies an axial preload to the two dynamic sealing rings 703, causing them to fit tightly against the static sealing rings 704 at both ends of the annular cavity 701, forming two sets of relatively rotating sealing surfaces (the dynamic sealing rings 703 rotate with the output shaft 6, while the static sealing rings 704 are fixed). The tight contact of the sealing surfaces blocks the intrusion path of liquid along the gap between the output shaft 6 and the housing. Simultaneously, the dynamic sealing rings 703 can slide axially along the output shaft 6, compensating for wear on the sealing surfaces or minor movement of the shaft, ensuring continuous and effective sealing. Its advantages are: the double sealing surfaces provide double protection, significantly improving the reliability of preventing liquid intrusion; the adaptive preload of the elastic element 702 and the axial sliding design of the dynamic sealing rings 703 can adapt to shaft vibration, movement, and wear on the sealing surfaces, extending the seal life; the annular cavity 701 structure protects the sealing assembly, preventing external impurities from directly interfering with the sealing surfaces, further ensuring sealing stability, thereby effectively preventing liquid from entering the motor and ensuring safe and efficient operation of the equipment.

[0027] In a preferred embodiment, the elastic element 702 is a spring, which is sleeved on the output shaft 6.

[0028] In the above embodiment, the spring is sleeved on the output shaft 6, which can not only apply a uniform preload force to the two dynamic sealing rings 703 in a stable axial direction to ensure tight sealing surface contact, but also save internal space of the annular cavity 701. Moreover, the direction of the force is consistent with the sealing surface contact requirements, thus improving sealing reliability.

[0029] In a preferred embodiment, the output end of the annular cavity 701 is provided with an opening, and a sealing cover 8 is detachably provided on the opening. The sealing cover 8 is provided with a through hole for the output shaft 6 to pass through. The static sealing ring 704, located at the output end of the annular cavity 701, is disposed on the sealing cover 8.

[0030] In the above embodiments, the design of the detachable sealing cover 8 at the output end of the annular cavity 701 not only allows the output shaft 6 to pass through and achieve basic sealing through the through hole, but also integrates the static sealing ring 704 at the output end onto the sealing cover 8. Its advantages are: when the sealing components (such as the static sealing ring 704 and the dynamic sealing ring 703) are worn and need to be replaced, it is not necessary to disassemble the entire annular cavity 701 or the motor housing. Only the sealing cover 8 needs to be removed for convenient operation, which greatly simplifies the maintenance process and reduces the maintenance difficulty. At the same time, during assembly, the fitting accuracy of the static sealing ring 704 and the dynamic sealing ring 703 can be precisely adjusted by the installation position of the sealing cover 8 to ensure that the sealing surfaces fit tightly. Moreover, the detachable structure of the sealing cover 8 does not affect the overall sealing performance of the annular cavity 701, thus taking into account both maintenance convenience and sealing reliability.

[0031] Optionally, the sealing cap 8 is connected to the opening by a plurality of bolts.

[0032] In a preferred embodiment, a sealing gasket 9 is provided on the mating surface between the sealing cover 8 and the opening.

[0033] In the above embodiments, the sealing cover 8 and the sealing gasket 9 of the opening mating surface can fill the tiny gap between them, enhance the sealing performance of this part, prevent liquid from entering the annular cavity 701 from the mating surface, and further improve the overall sealing reliability.

[0034] In a preferred embodiment, the arched fairing 1 is detachably connected to the outer wall of the drive motor 3, and the two ends of the support frame 2 are detachably connected to the arched fairing 1 and the air guide ring 4, respectively.

[0035] In the above embodiments, the detachable connection between the arched fairing 1 and the outer wall of the drive motor 3 facilitates the separate disassembly of the fairing for cleaning, maintenance or replacement (such as fairings adapted to different airflow conditions); the detachable connection at both ends of the support frame 2 facilitates the adjustment of the motor's installation position within the air guide ring 4 to ensure coaxiality, and also facilitates the separate disassembly of the support frame 2 or the motor for maintenance. The overall design improves assembly flexibility and maintenance convenience without affecting structural stability.

[0036] Optionally, the support frame 2 is designed to be detachable by bolts.

[0037] Furthermore, unless otherwise explicitly specified or limited, the terms "installation" and "connection" in this application embodiment should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "upper," "lower," "left," "right," "inner," "outer," and "side," etc., are merely for reference to the direction in the accompanying drawings or the usual placement of the product during use. They are only for clearly describing this application and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application. The terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance; "multiple" refers to at least two. In this application embodiment, the limitations on relative positional relationships such as parallel, perpendicular, and aligned are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallel, perpendicular, and aligned are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.

[0038] The above are only some embodiments and implementation methods of this application. The protection scope of this application is not limited thereto. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of this application. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A centrifugal fan characterized by comprising: include: Impeller (5); The air guide ring (4) is disposed on the air inlet side of the impeller (5) and rotates in conjunction with the impeller (5); as well as The drive assembly includes a drive motor (3) and a support frame (2). The drive motor (3) is located inside the air guide ring (4) on the air inlet side of the impeller (5) and is fixedly connected to the air guide ring (4) through the support frame (2). The output shaft (6) of the drive motor (3) is connected to the impeller (5) in a transmission manner.

2. A centrifugal fan according to claim 1, characterized in that, The drive motor (3) is arranged along the axial direction of the air guide ring (4), and an arched shroud (1) is provided on the side wall of the drive motor (3) away from the impeller (5).

3. A centrifugal fan according to claim 1, characterized in that, The output shaft (6) is provided with a mechanical seal structure (7) at the position where it protrudes from the housing of the drive motor (3).

4. A centrifugal fan according to claim 3, characterized in that, The mechanical seal structure (7) includes: An annular cavity (701) is disposed within the housing of the drive motor (3); The output shaft (6) passes through the annular cavity (701), and the annular cavity (701) provides the input end and the output end of the output shaft (6) at the entry point and the exit point, respectively. Two static sealing rings (704) are respectively fixedly installed at the input end and the output end of the annular cavity (701); The output shaft (6) passes through the two static sealing rings (704); Two dynamic sealing rings (703) are sleeved on the output shaft (6) located in the annular cavity (701) and rotate synchronously with the output shaft (6); The two dynamic sealing rings (703) are respectively fitted with the two static sealing rings (704), and any one of the dynamic sealing rings (703) can slide along the axial direction of the output shaft (6); and An elastic element (702) is disposed in the annular cavity (701), and its two ends abut against the two dynamic sealing rings (703).

5. A centrifugal fan according to claim 4, characterized in that, The elastic element (702) is a spring, which is sleeved on the output shaft (6).

6. A centrifugal fan according to claim 4, characterized in that, The output end of the annular cavity (701) is provided with an opening, and the opening is detachably provided with a sealing cover (8), and the sealing cover (8) is provided with a through hole for the output shaft (6) to pass through; The static sealing ring (704) located at the output end of the annular cavity (701) is disposed on the sealing cover (8).

7. A centrifugal fan according to claim 6, characterized in that, A sealing gasket (9) is provided on the mating surface between the sealing cap (8) and the opening.

8. A centrifugal fan according to claim 2, characterized in that, The arched fairing (1) is detachably connected to the outer wall of the drive motor (3), and the two ends of the support frame (2) are detachably connected to the arched fairing (1) and the air guide ring (4) respectively.

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