Large-diameter axial flow fan

Abstract

The utility model relates to the technical field of fans, in particular to a large-diameter axial flow fan, which overcomes the technical prejudice that an existing large-diameter axial flow fan uses a household floor fan structure and is provided with a front mesh enclosure, a rear mesh enclosure, an outer rotor motor and at least two blades. A stator shaft of the outer rotor motor extends out of the outer rotor in two directions and is supported and fixed by a front mesh enclosure and a rear mesh enclosure, a front fixing disc and a rear fixing disc which are used for supporting and fixing the two ends of the stator shaft are arranged in the center of the front mesh enclosure and the center of the rear mesh enclosure respectively, and at least two blades are circumferentially and equally fixed to the outer rotor. According to the fan, the stator shaft of the outer rotor motor extends out in two directions, the two ends of the stator shaft are supported by the front net cover and the rear net cover respectively, the motor rotates stably through supporting of the two ends of the stator shaft, the bearing capacity of the stator shaft is small, the selected motor is small in weight and size, material consumption of the whole fan is reduced, and a motor support is not needed; the gravity center of the fan is centered in the front-back direction, and when the fan is designed to be a movable fan, the stability of the fan is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan technical field, especially a large diameter axial flow fan. BACKGROUND

[0002] The axial flow fan is a most common fan, and the ordinary household floor fan is an axial flow fan, and the structure is that the impeller is installed on the extended shaft of the motor, the impeller is wrapped and protected by the front and rear mesh covers, the rear mesh cover is fixed on the motor shell, the front mesh cover is fixed on the rear mesh cover, and the motor is an internal rotor motor; In addition, there is an external rotor axial flow fan, such as a cooling fan at the computer CPU, and the blades of the fan are installed on the external rotor; the structures of the two kinds of fans are either that the impeller is installed on the extended shaft or that the external rotor with the installed impeller is rotated and supported by the extended stator shaft, and both are a cantilever support structure.

[0003] The structure of the computer CPU external rotor axial flow fan is only suitable for manufacturing such small cooling fans, and only the structure of the household fan can be used for manufacturing the large diameter axial flow fan, and the outer diameter of the impeller of the large diameter axial flow fan reaches 1.5 meters or more, but when the structure of the household fan is used for manufacturing the large diameter axial flow fan, the diameter of the motor shaft and the torque of the motor are relatively large in view of the strength and rigidity requirements of the cantilevered extended shaft for supporting the large diameter impeller, so that the weight and volume of the selected motor are relatively large, and the fixed support for supporting the motor also needs to have sufficient strength and rigidity, so that the material consumption of the whole fan of the existing large diameter axial flow fan is large, and the performance-price ratio of the product is low. SUMMARY

[0004] The utility model wants to solve the technical problem that a large diameter axial flow fan is provided, the technical prejudice of using the structure of the household floor fan for the existing large diameter axial flow fan is overcome, the material consumption of the fan is reduced, and the performance-price ratio of the product is improved.

[0005] The utility model adopts the technical scheme in the technical problem is solved: a large diameter axial flow fan has a front mesh cover, a rear mesh cover, an external rotor motor and at least two blades, the stator shaft of the external rotor motor extends bidirectionally from the external rotor and is supported and fixed by the front mesh cover and the rear mesh cover respectively, the central parts of the front mesh cover and the rear mesh cover have a front fixed disc and a rear fixed disc for supporting and fixing the two ends of the stator shaft respectively, and the at least two blades are circumferentially divided and fixed on the external rotor.

[0006] Specifically, the front mesh cover and the rear mesh cover are plane circular mesh covers, the fan further has a cylindrical mesh cover, and the front mesh cover and the rear mesh cover are respectively covered on the front port and the rear port of the cylindrical mesh cover.

[0007] Specifically, the fan further has a plastic ring connecting the front mesh cover and the cylindrical mesh cover and connecting the rear mesh cover and the cylindrical mesh cover.

[0008] Specifically, the outer rotor motor is a brushless motor.

[0009] Specifically, the fan has a support directly or indirectly supporting the front and rear net covers.

[0010] Specifically, the support has at least three moving wheels, at least one of which is a lockable and rotation-stopping moving wheel.

[0011] The axial flow fan has the following beneficial effects: the stator shaft of the outer rotor motor is bidirectionally extended, the blades are arranged on the outer rotor, the two ends of the stator shaft are supported by the front and rear net covers respectively, the stator shaft is stably rotated, the bearing capacity of the stator shaft is small, the weight and size of the selected motor can be reduced, the material consumption of the whole fan is reduced, and no motor support is needed; the gravity center of the fan is in the middle in the front and rear directions, and the stability of the fan is good when the fan is moved. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0013] Figure 1 is the front view of the present application;

[0014] Figure 2 is the partial sectional view along the motor axis of the present application;

[0015] Figure 3 is the Figure 2 enlarged view of A of

[0016] In the drawings: 1, front net cover, 1-1, front fixed disc;

[0017] 2, rear net cover, 2-1, rear fixed disc;

[0018] 3, outer rotor motor, 3-1, stator shaft, 3-2, outer rotor;

[0019] 4, blade;

[0020] 5, cylindrical net cover;

[0021] 6, plastic ring, 6-1, front ring, 6-2, rear ring, 6-3, connecting rib;

[0022] 7, support, 7-1, moving wheel. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described in the following with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0024] As shown in the accompanying Figure 1 A large-diameter axial flow fan, in combination with the sectional view of the accompanying Figure 2 , has a front net cover 1, a rear net cover 2, an outer rotor motor 3 and three blades 4. The stator shaft 3-1 of the outer rotor motor 3 extends bidirectionally from the inside to the outside of the outer rotor 3-2 and is supported and fixed by the front net cover 1 and the rear net cover 2 respectively. The central part of the front net cover 1 and the rear net cover 2 has a front fixed disc 1-1 and a rear fixed disc 2-1 for supporting and fixing the two ends of the stator shaft 3-1 respectively. The structure of the front fixed disc 1-1 and the rear fixed disc 2-1 for supporting the two ends of the stator shaft 3-1 is shown in the accompanying Figure 3 . The three blades 4 are fixed circumferentially and equally on the outer rotor 3-2. The front net cover 1 and the rear net cover 2 are planar circular net covers. The fan also has a cylindrical net cover 5. The front net cover 1 and the rear net cover 2 are respectively covered on the front and rear opening parts of the cylindrical net cover 5. The fan also has a plastic ring 6 for connecting the front net cover 1 and the cylindrical net cover 5 and connecting the rear net cover 2 and the cylindrical net cover 5. The plastic ring 6 is divided into a front ring 6-1 and a rear ring 6-2. The front ring 6-1 and the rear ring 6-2 are connected into one body by a plurality of horizontal connecting ribs 6-3. The front ring 6-1 and the rear ring 6-2 can also be separate bodies without using the connecting ribs 6-3. The front and rear rings are used for connecting the front and rear net covers and the cylindrical net cover. The plastic ring 6 also plays a role in increasing the strength of the net cover.

[0025] The outer rotor motor 3 is a brushless motor. The brushless motor refers to a motor without brush and commutator (or collector ring). The brushless motor is also called a commutatorless motor. The brushless motor can be relatively thin.

[0026] The moving structure of the fan is that the fan has a support 7 for directly or indirectly supporting the front net cover 1 and the rear net cover 2. The support 7 can be fixedly connected with the front net cover 1, the rear net cover 2, the cylindrical net cover 5 and / or the plastic ring 6. The support 7 has four moving wheels 7-1. Two of the moving wheels 7-1 are lockable and non-rotatable.

[0027] The above is only the preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered within the protection scope of the utility model.

Claims

1. A large diameter axial flow fan characterised in that: The fan has a front net cover (1), a rear net cover (2), an outer rotor motor (3) and at least two blades (4), the stator shaft (3-1) of the outer rotor motor (3) extends bidirectionally from the outer rotor (3-2) and is supported and fixed by the front net cover (1) and the rear net cover (2) respectively, the central part of the front net cover (1) and the rear net cover (2) has a front fixed disc (1-1) and a rear fixed disc (2-1) for supporting and fixing the two ends of the stator shaft (3-1) respectively, and the at least two blades (4) are circumferentially equally divided and fixed on the outer rotor (3-2).

2. A large diameter axial fan as claimed in claim 1, characterized in that: The front net cover (1) and the rear net cover (2) are planar circular net covers, and the fan further has a cylindrical net cover (5), and the front net cover (1) and the rear net cover (2) are respectively covered on the front opening part and the rear opening part of the cylindrical net cover (5).

3. A large diameter axial fan as claimed in claim 2, characterized in that: The fan further has a plastic ring (6) connecting the front net cover (1) and the cylindrical net cover (5) and connecting the rear net cover (2) and the cylindrical net cover (5).

4. A large diameter axial fan as claimed in claim 1, characterized in that: The outer rotor motor (3) is a brushless motor.

5. A large diameter axial fan as claimed in claim 1, characterized in that: The fan has a support (7) directly or indirectly supporting the front net cover (1) and the rear net cover (2).

6. A large diameter axial fan as claimed in claim 5, characterised in that: The support (7) has at least three moving wheels (7-1), and at least one of the moving wheels (7-1) is a lockable and rotation-stopping moving wheel.

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