High-protection outer rotor centrifugal fan

Abstract

The utility model discloses a high protection outer rotor centrifugal fan which comprises an outer rotor motor and a wind wheel, the wind wheel comprises a wheel disc and a wheel cover, the wheel disc and the wheel cover are connected through a plurality of fan blades, the wheel disc is sleeved on a rotor of the outer rotor motor, the high protection outer rotor centrifugal fan further comprises a waterproof cover, and the center of the waterproof cover protrudes inwards to form a mounting sleeve. The waterproof cover is sleeved on an end cover of the outer rotor motor through a mounting sleeve, the waterproof cover covers the upper surface or the lower surface of the wheel disc, the inner side of the waterproof cover protrudes towards the direction of the wheel disc to form at least one first annular boss, the wheel disc protrudes towards the direction of the waterproof cover to form at least one second annular boss, and the first annular bosses and the second annular bosses are arranged at intervals; a channel is formed between the waterproof cover and the wheel disc. The waterproof cover can block external foreign matters and an external water source, the external water source is prevented from entering the motor, the first annular boss and the second annular boss further form a multi-layer waterproof structure, and the purpose of improving the protection capacity of the outer rotor centrifugal fan is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a high protection outer rotor centrifugal fan. BACKGROUND

[0002] The structural characteristics of the conventional outer rotor centrifugal fan, in the energy storage, chemical industry, pharmaceutical industry, metallurgy and other environments and cooling tower, air-cooled condenser and air-cooled heat exchanger and other ventilation and refrigeration equipment, the ventilation and refrigeration equipment often faces high humidity, water vapor, corrosive gas and other adverse conditions, under the special environment process, its service life is relatively insufficient due to its sealing performance relative to the sealing performance of the inner rotor fan and motor and other good products. Water and corrosive gases can be effectively prevented from entering the fan interior, prolonging the service life of the equipment and reducing maintenance costs. In basements, underground garages, subway stations and other underground spaces, as well as buildings in coastal areas, high-protection fans and motors can prevent rainwater and humid air from damaging the equipment and ensure the normal operation of the ventilation system.

[0003] The existing outer rotor centrifugal fan includes an outer rotor motor and a fan wheel, the fan wheel includes a wheel disc and a wheel cover, a plurality of fan blades are connected between the wheel disc and the wheel cover, the wheel disc is sleeved on the rotor of the outer rotor motor, and the water inlet path of the outer rotor centrifugal fan is mainly the gap between the motor stator and the rotor. The stator-rotor gap of the fan is directly in contact with the external environment. Especially in outdoor environment operation, most of them can only have 4-level waterproof capability. When water enters the motor interior from the stator-rotor gap of the centrifugal fan axial flow fan, the motor interior has windings and electrical elements, and the water will make the windings damp, reducing the insulation performance. This can cause short circuit failure of the motor. Once short-circuited, the current of the motor will increase sharply, generating a large amount of heat, thereby burning the motor. In addition, the bearing of the motor can also be damaged due to water entering. Impurities in the water can enter the interior of the bearing, reducing the lubrication performance of the bearing and increasing the friction force. Long-time friction can cause the bearing to wear out, generate abnormal vibration and noise, and eventually make the motor unable to operate normally. TECHNICAL SOLUTION

[0004] The utility model provides a kind of high protection outer rotor centrifugal fan, to solve the technical problem that the stator-rotor gap of outer rotor centrifugal fan in prior art is directly in external contact environment, insulation performance and dustproof waterproof performance are not high, cause high failure rate.

[0005] The technical scheme of the utility model is as follows:

[0006] The utility model discloses a high protection outer rotor centrifugal fan, including outer rotor motor and wind wheel, and the wind wheel includes wheel disc and wheel cover, and the wheel disc is connected with the wheel cover by a plurality of fan blades, and the wheel disc is sleeved on the rotor of outer rotor motor, and it is characterized in that: still include waterproof cover, the waterproof cover center is inwards and projects and has installation sleeve, and the waterproof cover is sleeved on the end cover of outer rotor motor through installation sleeve, and the waterproof cover covers the upper or lower of wheel disc, and the inboard of waterproof cover projects at least one first annular boss to wheel disc direction, and the wheel disc projects at least one second annular boss to waterproof cover direction, and the first annular boss is arranged with the second annular boss interval, and the channel is formed between waterproof cover and wheel disc.

[0007] The diameter of the second annular boss on the outermost periphery is greater than the diameter of all the first annular bosses.

[0008] The number of the first annular boss and the second annular boss is two, a first groove is formed between the two adjacent first annular bosses, a second groove is formed between the two adjacent second annular bosses, one of the second annular bosses is embedded in the first groove, and one of the first annular bosses is embedded in the second groove.

[0009] The channel entrance is formed between the outer edge of the wheel disc and the outer edge of the waterproof cover, the axial height H1 of the channel entrance and the rotor diameter D1 of the outer rotor motor satisfy 0.005D1≤H1≤0.1D1.

[0010] The first annular boss and the second annular boss are partially overlapped in the radial direction, the minimum size H2 of the overlapping position and the rotor diameter D1 of the outer rotor motor satisfy 0.1D1≤H2≤0.5D1.

[0011] A water baffle is further installed on the wheel disc, the water baffle is installed between the second annular boss and the outer edge of the wheel disc, and the third annular boss 41 is protruded towards the waterproof cover.

[0012] The top of the third annular boss is provided with a flange in the radial direction.

[0013] The axial drop is formed between the top end of the flange and the outer edge of the wheel disc, the height H3 of the axial drop and the rotor diameter D1 of the outer rotor motor satisfy 0.1D1≤H3≤0.5D1.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. The high protection outer rotor centrifugal fan, comprising an outer rotor motor and a fan wheel, the fan wheel comprising a wheel disc and a wheel cover, the wheel disc and the wheel cover being connected by a plurality of fan blades, the wheel disc being sleeved on the rotor of the outer rotor motor, and the high protection outer rotor centrifugal fan further comprising a waterproof cover, the waterproof cover being centrally inwardly protruded with a mounting sleeve, the waterproof cover being sleeved on the end cover of the outer rotor motor through the mounting sleeve, the waterproof cover being covered on the wheel disc, and the inner side of the waterproof cover being protruded with at least one first annular boss in the direction of the wheel disc, the wheel disc being protruded with at least one second annular boss in the direction of the waterproof cover, the first annular boss and the second annular boss being arranged at intervals, and a channel being formed between the waterproof cover and the wheel disc. The waterproof cover can block external foreign matters and external water sources, reduce the entry of the external water sources into the motor, the first annular boss and the second annular boss further form a multi-layer waterproof structure, the purpose of improving the protection capability of the outer rotor centrifugal fan is achieved, the dustproof and waterproof performance is greatly improved, and the product reliability is improved.

[0016] 2. Other advantages of the utility model are described in detail in the embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A structure schematic view of the high protection outer rotor centrifugal fan provided by the embodiment one of the utility model;

[0018] Figure 2 An explosion schematic view of the high protection outer rotor centrifugal fan provided by the embodiment one;

[0019] Figure 3 A sectional view of the high protection outer rotor centrifugal fan provided by the embodiment one;

[0020] Figure 4 A structure schematic view of the waterproof cover in the high protection outer rotor centrifugal fan;

[0021] Figure 5 An explosion schematic view of the high protection outer rotor centrifugal fan provided by the embodiment two;

[0022] Figure 6 A sectional view of the high protection outer rotor centrifugal fan provided by the embodiment two;

[0023] Figure 7 A structure schematic view of the waterproof cover in the high protection outer rotor centrifugal fan; DETAILED DESCRIPTION

[0024] 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.

[0025] Example 1:

[0026] like Figures 1 to 4 As shown, this embodiment provides a high-protection external rotor centrifugal fan, including an external rotor motor 1 and a fan wheel 2. The fan wheel 2 includes a disc 21 and a cover 22. The disc 21 and the cover 22 are connected by a plurality of fan blades 23. The disc 21 is fitted onto the rotor 11 of the external rotor motor 1. The feature is that it also includes a waterproof cover 3. The waterproof cover 3 has an inwardly protruding mounting sleeve 31 at its center. The waterproof cover 3 is fitted onto the end cover 12 of the external rotor motor 1 through the mounting sleeve 31. The waterproof cover 3 covers the disc 21 above or below it. The inner side of the waterproof cover 3 has at least one first annular boss 32 protruding towards the disc 21. The disc 21 has at least one second annular boss 24 protruding towards the waterproof cover 3. The first annular boss 32 and the second annular boss 24 are spaced apart, and a channel 9 is formed between the waterproof cover 3 and the disc 21.

[0027] The high-protection external rotor centrifugal fan has a small channel 9 between the waterproof cover 3 and the impeller 21, which can block external foreign objects and external water sources from entering the external rotor fan 1 and the impeller 2, and prevent the entry of external water sources. The first annular boss 32 and the second annular boss 24 form a multi-layer waterproof structure, which can improve the protection capability of the external rotor centrifugal fan, greatly improve the dustproof and waterproof performance, and improve the reliability of the product.

[0028] The outermost second annular boss 24 has a larger diameter than all the first annular bosses 32.

[0029] The number of the first annular protrusion 32 and the second annular protrusion 24 are both two. A first groove 321 is formed between two adjacent first annular protrusions 32, and a second groove 241 is formed between two adjacent second annular protrusions 24. One of the second annular protrusions 24 is embedded in the first groove 321, and one of the first annular protrusions 32 is embedded in the second groove 241.

[0030] A channel entrance 91 is formed between the outer edge of the aforementioned wheel 21 and the outer edge of the waterproof cover 3. The axial height H1 of the channel entrance 91 and the rotor diameter D1 of the outer rotor motor 1 satisfy the condition 0.005D1≤H1≤0.1D1.

[0031] The first annular boss 32 and the second annular boss 24 are partially overlapped in the radial direction. The minimum dimension H2 of the overlap position satisfies the condition 0.1D1≤H2≤0.5D1 with respect to the rotor diameter D1 of the external rotor motor 1.

[0032] Example 2:

[0033] like Figures 5 to 7 As shown, the high-protection external rotor centrifugal fan provided in this embodiment is similar to the high-protection external rotor centrifugal fan described in Embodiment 1, except that:

[0034] A water-retaining ring 4 is also installed on the aforementioned wheel 21. The water-retaining ring 4 is installed between the second annular boss 24 and the outer edge of the wheel 21, and the water-retaining ring 4 has a third annular boss 41 protruding towards the waterproof cover 3. The water-retaining ring 4 can prevent dust and impurities from entering the interior of the outer rotor motor 1 and damaging key components such as the outer rotor motor 1 and the impeller 2.

[0035] The third annular protrusion 41 described above has a flange 42 extending radially outward from its top. The flange 42 further blocks dust, causing it to remain inside the water-blocking ring 4.

[0036] An axial drop is formed between the top of the flange 42 and the outer edge of the wheel 21. The height H3 of the axial drop satisfies the condition 0.1D1≤H3≤0.5D1 with respect to the rotor diameter D1 of the outer rotor motor 1.

[0037] The high-protection external rotor centrifugal fan described in this embodiment is mainly used in centrifugal fans for general industries such as energy storage air conditioning and outdoor ventilation and refrigeration. It can completely prevent the intrusion of foreign objects and dust, and can also work normally under water spray. The high-protection external rotor centrifugal fan of this utility model has significantly improved dustproof and waterproof performance, improving product reliability.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-protection external rotor centrifugal fan, comprising an external rotor motor (1) and a fan wheel (2), the fan wheel (2) comprising a disc (21) and a cover (22), the disc (21) and the cover (22) being connected by a plurality of fan blades (23), the disc (21) being mounted on the rotor (11) of the external rotor motor (1), characterized in that: It also includes a waterproof cover (3), with an inwardly protruding mounting sleeve (31) at the center of the waterproof cover (3). The waterproof cover (3) is fitted onto the end cover (12) of the external rotor motor (1) through the mounting sleeve (31). The waterproof cover (3) covers the wheel disk (21) above or below. The inner side of the waterproof cover (3) protrudes towards the wheel disk (21) with at least one first annular boss (32). The wheel disk (21) protrudes towards the waterproof cover (3) with at least one second annular boss (24). The first annular boss (32) and the second annular boss (24) are spaced apart, and a channel (9) is formed between the waterproof cover (3) and the wheel disk (21).

2. The high-protection external rotor centrifugal fan according to claim 1, characterized in that: The outermost second annular boss (24) has a larger diameter than all the first annular bosses (32).

3. A high-protection external rotor centrifugal fan according to claim 2, characterized in that: The number of the first annular protrusion (32) and the second annular protrusion (24) are both two. A first groove (321) is formed between two adjacent first annular protrusions (32), and a second groove (241) is formed between two adjacent second annular protrusions (24). One of the second annular protrusions (24) is embedded in the first groove (321), and one of the first annular protrusions (32) is embedded in the second groove (241).

4. A high-protection external rotor centrifugal fan according to claim 3, characterized in that: A channel entrance (91) is formed between the outer edge of the wheel (21) and the outer edge of the waterproof cover (3). The axial height H1 of the channel entrance (91) satisfies the condition 0.005D1≤H1≤0.1D1 with respect to the rotor diameter D1 of the outer rotor motor (1).

5. A high-protection external rotor centrifugal fan according to claim 4, characterized in that: The first annular boss (32) and the second annular boss (24) have a partial overlap in the radial direction. The minimum dimension H2 of the overlap position satisfies the condition 0.1D1≤H2≤0.5D1 with respect to the rotor diameter D1 of the external rotor motor (1).

6. A high-protection external rotor centrifugal fan according to any one of claims 1 to 5, characterized in that: A water-blocking ring (4) is also installed on the wheel (21). The water-blocking ring (4) is installed between the second annular boss (24) and the outer edge of the wheel (21). The water-blocking ring (4) has a third annular boss (41) protruding towards the waterproof cover (3).

7. A high-protection external rotor centrifugal fan according to claim 6, characterized in that: The top of the third annular boss (41) is provided with a flange (42) that extends radially outward.

8. A high-protection external rotor centrifugal fan according to claim 7, characterized in that: An axial drop is formed between the top of the flange (42) and the outer edge of the wheel (21). The height H3 of the axial drop satisfies the condition 0.1D1≤H3≤0.5D1 with respect to the rotor diameter D1 of the outer rotor motor (1).

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