Fan impeller and outer rotor fan

Abstract

The utility model relates to the technical field of outer rotor fans, in particular to a fan impeller and an outer rotor fan. The fan impeller comprises an impeller disc, blades and a plastic balance weight part, and the multiple blades are arranged on the impeller disc in the circumferential direction at intervals. A plurality of plastic balance weight pieces are arranged on the impeller disc in the circumferential direction at intervals, and each plastic balance weight piece comprises an easy-to-fold part. The outer rotor fan comprises the fan impeller, a plurality of plastic balance weight pieces are arranged on the impeller disc at intervals in the circumferential direction, and part of the plastic balance weight pieces or the whole plastic balance weight pieces are separated from the impeller disc through the easy-to-fold parts so as to meet the dynamic balance requirement when the fan impeller rotates. The plastic counterweight parts are mounted on the impeller disc, so that the plastic counterweight parts clamped on the blades are prevented from falling off, and the mounting stability and reliability of the plastic counterweight parts are improved. Meanwhile, the plastic balance weight piece is installed on the impeller disc, the air channel space between the blades is prevented from being occupied, and the air outlet efficiency of the outer rotor draught fan is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of outer rotor fan, especially relates to a fan impeller and outer rotor fan. BACKGROUND

[0002] In the water heater, the outer rotor fan inhales the outside air to provide sufficient oxygen for the combustion chamber, ensuring that the gas can be fully burned. The flue gas generated by the burner is discharged through the outer rotor fan to prevent the accumulation of flue gas inside the water heater and ensure safe use.

[0003] The outer rotor fan usually includes a volute, a fan impeller, a rotor assembly, a stator assembly, etc. The blade angle and profile of the fan impeller are shaped by mold injection. To ensure the dynamic balance of the fan impeller during rotation and reduce the vibration and noise of the outer rotor fan, a balance detection device is usually used to detect the unbalance of the fan impeller during rotation, and then a balance clip or a glue group is installed on the blade. The above-mentioned counterweight is installed on the blade, which reduces the air duct between the blades and affects the air outlet efficiency of the outer rotor fan. SUMMARY

[0004] One of the technical problems solved by the utility model is to provide a fan impeller that can effectively solve the technical problem of the existing technology that the plastic counterweight installed on the blade affects the air outlet efficiency of the fan impeller.

[0005] The second technical problem solved by the utility model is to provide an outer rotor fan that can effectively solve the technical problem of the existing technology that the plastic counterweight installed on the blade affects the air outlet efficiency of the outer rotor fan.

[0006] The first technical problem is solved by the following technical scheme:

[0007] The fan impeller comprises:

[0008] The impeller disc comprises:

[0009] The impeller disc comprises:

[0010] The impeller disc comprises:

[0011] The fan impeller of the utility model has the beneficial effects compared with the background art:

[0012] By installing the plastic counterweight on the impeller disc, the wind channel space between the blades is avoided, and the air outlet efficiency of the fan impeller is ensured; meanwhile, the plastic counterweight is made of plastic, and the plastic counterweight is provided with a breakable part, so that the plastic counterweight or the entire counterweight is separated from the impeller disc, so as to meet the dynamic balance requirement of the fan impeller during rotation.

[0013] In one of the embodiments, the plastic counterweight further comprises a counterweight part connected with the breakable part, and the cross-sectional area of the counterweight part is greater than that of the breakable part.

[0014] In one of the embodiments, the plastic counterweight comprises at least two counterweight parts, and the counterweight parts and the breakable part are alternately arranged along the axial direction of the plastic counterweight.

[0015] In one of the embodiments, in the same plastic counterweight, the weights of at least part of the counterweight parts are equal.

[0016] In one of the embodiments, the breakable part is provided with an indentation in the circumferential direction.

[0017] In one of the embodiments, the impeller disc comprises:

[0018] A skeleton is provided with a plurality of plastic counterweights in the circumferential direction.

[0019] A disc body is arranged on the circumferential side of the skeleton in the circumferential direction of the skeleton, and the disc body is provided with a plurality of blades on both sides in the thickness direction.

[0020] In one of the embodiments, the skeleton is provided with a plurality of plastic counterweights at one end and / or the other end in the axial direction.

[0021] In one of the embodiments, the plastic counterweight is integrally connected with the impeller disc or is screw-connected.

[0022] In one of the embodiments, the central angles of two adjacent plastic counterweights are 5°-10°.

[0023] The second technical problem is solved by the following technical scheme:

[0024] The outer rotor fan comprises the fan impeller.

[0025] Compared with the background art, the outer rotor fan has the beneficial effects that:

[0026] By installing the plastic counterweight on the impeller disc, the air duct space between the blades is avoided, which is beneficial to ensure the air outlet efficiency of the fan impeller; meanwhile, since the plastic counterweight is made of plastic and the plastic counterweight is provided with the easy-to-fold part, the plastic counterweight is conveniently arranged on the impeller disc in a circumferential direction, a plurality of plastic counterweights are arranged on the impeller disc in a circumferential direction, and the plastic counterweight is separated from the impeller disc through the easy-to-fold part, so as to meet the dynamic balance requirement of the fan impeller during rotation. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of an outer rotor fan provided by an embodiment of the present application;

[0028] Figure 2 is a sectional view of the outer rotor fan provided by an embodiment of the present application;

[0029] Figure 3 is a first structural schematic diagram of a fan impeller provided by an embodiment of the present application;

[0030] Figure 4 is a second structural schematic diagram of the fan impeller provided by an embodiment of the present application;

[0031] Figure 5 is Figure 2 is an enlarged view of a local structure at A in FIG.

[0032] Figure 6 is Figure 2 is an enlarged view of a local structure at B in FIG.

[0033] Names and numbers of components in the drawings are as follows:

[0034] 10, volute; 20, rotating shaft; 30, magnetic ring;

[0035] 1, impeller disc; 11, framework; 12, disc body; 2, blade; 3, plastic counterweight; 31, counterweight part; 32, easy-to-fold part. DETAILED DESCRIPTION

[0036] In order to make the technical problems solved by the present application, the technical scheme adopted and the technical effects achieved more clear, the technical scheme of the present application will be further described below in combination with the drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, but not all.

[0037] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements internal communication or two element mutual action relationship.For the ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0038] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional features between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0039] In the description of the embodiment, the orientation or position relationship of the terms "up", "down", "right", "left" and the like is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0040] The technical scheme of the utility model will be further illustrated below by combining the drawings and through specific embodiments.

[0041] The embodiment proposes an outer rotor fan, which is used in gas water heaters and other equipment, which is not specifically limited here.

[0042] Specifically, as Figure 1 And Figure 2As shown, the external rotor fan includes a volute 10, a rotating shaft 20, a magnetic ring 30, and a fan impeller. The fan impeller is installed inside the volute 10 and includes an impeller disk 1 and blades 2. Multiple blades 2 are spaced circumferentially on the impeller disk 1. Specifically, the impeller disk 1 includes a frame 11 and a disk body 12. The disk body 12 is arranged circumferentially on the side of the frame 11, and multiple blades 2 are arranged on both sides of the disk body 12 in the thickness direction. On the same side of the disk body 12 in the thickness direction, multiple blades 2 are equally spaced circumferentially on the disk body 12. The frame 11 is coaxially connected to the rotating shaft 20, and a magnetic ring 30 is fixedly installed inside the frame 11. The magnetic ring 30 is a multi-pole integral injection-molded magnetic ring. The magnetic ring 30 and the rotating shaft 20 are placed in an injection mold and, after injection molding, form an injection-molded impeller rotor. Since external rotor fans are existing technology, the specific structure of external rotor fans will not be described in detail.

[0043] To ensure the dynamic balance of the fan impeller during rotation and reduce the vibration and noise of the external rotor fan, balancing equipment is typically used to detect the imbalance of the impeller during rotation. Then, balancing clamps or plastic counterweights such as adhesive pads are added to the blades. These plastic counterweights, installed on the blades, reduce the airflow between the blades, thus affecting the air output efficiency of the external rotor fan.

[0044] To solve the above problems, such as Figure 2 As shown, this embodiment also proposes a fan impeller, which further includes plastic counterweights 3. Multiple plastic counterweights 3 are spaced circumferentially on the impeller disk 1, and each plastic counterweight 3 includes a folding portion 32. By installing the plastic counterweights 3 onto the impeller disk 1, the space between the blades 2 in the air duct is avoided, which helps ensure the air outlet efficiency of the fan impeller. Simultaneously, since the plastic counterweights 3 are made of plastic and have folding portions 32, it is easy to separate part or all of the plastic counterweights 3 from the impeller disk 1 to meet the dynamic balance requirements of the fan impeller during rotation. Specifically, the plastic counterweights 3 can be made of materials such as acrylonitrile-butadiene-styrene copolymer, polyvinyl chloride, polypropylene, and high-density polyethylene.

[0045] In one embodiment, the plastic counterweight 3 is integrally formed and connected to the impeller disk 1. Specifically, the impeller disk 1 and multiple plastic counterweights 3 are integrally formed by injection molding, which reduces the processing difficulty of the plastic counterweights 3 and the impeller disk 1 and improves the structural strength of the plastic counterweights 3 and the impeller disk 1. In other embodiments, threaded holes can be provided in the impeller disk 1, and the plastic counterweights 3 are threadedly connected to the impeller disk 1. The weight of the plastic counterweights 3 can be set to various types, such as 50mg, 100mg, 150mg, etc., so that some or all of the plastic counterweights 3 can be detached from the impeller disk 1 according to the dynamic balance adjustment requirements of the fan impeller.

[0046] Specifically, when the fan impeller or the outer rotor fan is detected on the balance detection device, due to the weight loss condition of the fan impeller, the balance detection device detects the weight loss at a certain position and displays it on the display screen of the balance detection device in the form of angle and coordinate, at this time, only need to follow the display data to separate (i.e. remove) the specific weight of the plastic counterweight 3 at the corresponding position from the impeller disc 1, and then re-detect the fan impeller or the outer rotor fan until the balance amount detected by the balance detection device is within the qualified range. The above balance detection device is prior art, and the structure and working process of the balance detection device will not be described again.

[0047] As shown in Figure 3 and Figure 4 , the plurality of plastic counterweights 3 are arranged on the skeleton 11 in a circumferential direction. By installing the plastic counterweight 3 on the skeleton 11, the stability and reliability of the plastic counterweight 3 installation are improved. At the same time, it can also avoid occupying the air duct space between the blades 2, which is beneficial to ensure the air outlet efficiency of the fan impeller.

[0048] As shown in Figures 2 to 4 , the plurality of plastic counterweights 3 are arranged on the skeleton 11 in a circumferential direction. By installing the plastic counterweight 3 on the skeleton 11, the stability and reliability of the plastic counterweight 3 installation are improved. At the same time, it can also avoid occupying the air duct space between the blades 2, which is beneficial to ensure the air outlet efficiency of the fan impeller.

[0049] It should be noted that if the noise level requirement of the outer rotor fan is low, only the plastic counterweight 3 at one end of the skeleton 11 can be dynamically balanced, and the plastic counterweight 3 at the corresponding end can be truncated. If the noise level requirement of the outer rotor fan is high (for example, the first level of silence), the plastic counterweights 3 at both ends of the skeleton 11 need to be dynamically balanced, and the plastic counterweights 3 at both ends of the skeleton 11 need to be truncated.

[0050] As shown in Figure 5 and Figure 6As shown, the plastic weight 3 comprises the weight part 31 connected with the breakable part 32, and the cross-sectional area of the weight part 31 is larger than that of the breakable part 32. By the above arrangement, the cross-sectional area of the breakable part 32 is relatively small, which facilitates the cutting of the breakable part 32 to separate the weight part 31 from the impeller disc 1, reduces the difficulty of separating the plastic weight 3, and improves the adjustment efficiency of dynamic balance. It should be noted that, since the cross-sectional area of the breakable part 32 is smaller than that of the weight part 31, and the axial length of the breakable part 32 is much smaller than that of the weight part 31, the weight of the breakable part 32 is much smaller than that of the weight part 31. That is, during the adjustment of dynamic balance, the weight part 31 plays a major role in adjustment.

[0051] In one embodiment, the plastic weight 3 comprises at least two weight parts 31, and the weight parts 31 and the breakable part 32 are arranged alternately along the axial direction of the plastic weight 3. By arranging the plastic weight 3 as a multi-section structure with alternating thicknesses, one of the breakable parts 32 can be selectively cut according to the detection structure of the balance detection equipment, so as to remove one or more weight parts 31, thereby accurately removing the required weight, and improving the adjustment efficiency and accuracy of dynamic balance of the fan impeller.

[0052] In this embodiment, the weight part 31 and the breakable part 32 are both cylindrical, and the diameter of the weight part 31 is larger than that of the breakable part 32, so that the breakable part 32 is thinner than the weight part 31, facilitating the cutting operation of the breakable part 32.

[0053] Further, in one embodiment, the breakable part 32 is provided with a notch (not shown in the figure) in the circumferential direction. By arranging the notch, the breakable part 32 can be cut along the track of the notch, further reducing the difficulty of the cutting operation of the breakable part 32, and improving the adjustment efficiency of dynamic balance of the fan impeller. The above notch is a ring-shaped groove arranged in the circumferential direction of the breakable part 32.

[0054] In one embodiment, the weights of at least some of the weight parts 31 in the same plastic weight 3 are equal. In this embodiment, the weights of the weight parts 31 are all equal. In other embodiments, the weights of the weight parts 31 in the same plastic weight 3 can also be arranged to be different according to the adjustment requirements of dynamic balance. For example, from the end of the plastic weight 3 connected with the impeller disc 1 to the other end of the plastic weight 3 away from the impeller disc 1, the axial length of the weight part 31 gradually increases, so that the weights of the weight parts 31 in the same plastic weight 3 gradually increase.

[0055] It should be noted that the central angle corresponding to the two adjacent plastic counterweights 3 is 5°-10°. The central angle corresponding to the two adjacent plastic counterweights 3 can be 5°, 6°, 7°, 8°, 9° or 10°, etc. The setting of the above-mentioned central angle can not only avoid the problem that the space between the adjacent plastic counterweights 3 is too small due to the too small central angle, which affects the smooth cutting of the plastic counterweight 3. At the same time, it can also avoid the problem that the number of plastic counterweights 3 is small due to the too large central angle, which makes it difficult to accurately adjust the dynamic balance of the fan impeller. The above-mentioned two adjacent plastic counterweights 3 refer to the plastic counterweights 3 at the same end of the skeleton 11 in the axial direction.

[0056] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited to the above embodiments. Without departing from the spirit and scope of the present application, various changes and modifications can be made to the present application, and these changes and modifications all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A fan impeller, characterized by, The fan wheel comprises: a blade disc (1); a plurality of blades (2) circumferentially spaced apart on the blade disc (1); a plurality of plastic counterweights (3) circumferentially spaced apart on the blade disc (1), wherein each plastic counterweight (3) comprises a breakable portion (32).

2. The fan impeller of claim 1, wherein Each plastic counterweight (3) further comprises a counterweight portion (31) connected to the breakable portion (32), wherein the cross-sectional area of the counterweight portion (31) is larger than that of the breakable portion (32).

3. The fan impeller of claim 2, wherein Each plastic counterweight (3) comprises at least two counterweight portions (31) and the breakable portion (32) and the counterweight portions (31) are alternately arranged along the axial direction of the plastic counterweight (3).

4. The fan impeller of claim 3, wherein In the same plastic counterweight (3), the weight of at least some of the counterweight portions (31) is equal.

5. The fan impeller of any one of claims 1-4, wherein, The breakable portion (32) is provided with an indentation in the circumferential direction.

6. The fan impeller of any one of claims 1-4, wherein, The fan wheel comprises: a framework (11) provided with a plurality of plastic counterweights (3) circumferentially spaced apart; a disc body (12) provided on the circumferential side of the framework (11) in the circumferential direction of the framework (11), wherein both sides of the disc body (12) in the thickness direction are provided with a plurality of blades (2).

7. The fan impeller of claim 6, wherein One end and / or the other end of the framework (11) in the axial direction is provided with a plurality of plastic counterweights (3).

8. The fan impeller of any one of claims 1-4, wherein, The plastic counterweight (3) is integrally connected to the fan wheel (1) or is threadedly connected to the fan wheel (1).

9. The fan impeller of any one of claims 1-4, wherein, The central angle corresponding to two adjacent plastic counterweights (3) is 5°-10°.

10. An outer rotor fan, characterized by, The fan wheel comprises any one of claims 1-9.

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