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 balance weight part. The impeller disc is provided with a plurality of connecting structures at intervals in the circumferential direction. A plurality of blades are arranged on the impeller disc at intervals in the circumferential direction; and the counterweight piece is detachably connected with the connecting structure so as to adjust the dynamic balance when the fan impeller rotates. The outer rotor fan comprises the fan impeller. The impeller disc is provided with a plurality of balance holes, and the counterweight part is detachably connected with the impeller disc through the balance holes, so that on one hand, the air duct space between the blades is prevented from being occupied, the air outlet efficiency of the fan impeller is guaranteed, and on the other hand, the counterweight part is conveniently added on the impeller disc according to the counterweight requirement of the fan impeller so as to improve the rotating stability of the fan impeller.

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 burn fully. 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 safety in 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 paste of a weight is added to 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 counterweight installed on the blade affecting the air outlet efficiency of the fan impeller in the prior art.

[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 counterweight installed on the blade affecting the air outlet efficiency of the outer rotor fan in the prior art.

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

[0007] The impeller disc is provided with a plurality of connecting structures spaced apart in the circumferential direction;

[0008] The impeller disc is provided with a plurality of connecting structures spaced apart in the circumferential direction;

[0009] The counterweight is detachably connected with the connecting structure to adjust the dynamic balance of the fan impeller during rotation.

[0010] The fan impeller of the utility model has the following beneficial effects compared with the background art:

[0011] The impeller disc is provided with a plurality of connecting structures, and the counterweight is detachably connected with the impeller disc through the connecting structure. On the one hand, it avoids occupying the air duct space between the blades, which is conducive to ensuring the air outlet efficiency of the fan impeller. On the other hand, it is convenient to add the counterweight to the impeller disc according to the weight requirement of the fan impeller to improve the stability of the fan impeller during rotation.

[0012] In one of the embodiments, the counterweight comprises a first column and a second column connected together, and a stepped surface is arranged between the first column and the second column; an outer periphery of the second column is provided with a stopper, the second column is arranged in the corresponding balance hole, and the stopper and the stepped surface are respectively abutted on two sides in the thickness direction of the impeller disc.

[0013] In one of the embodiments, the stopper is elastic and integrally formed with the second column.

[0014] In one of the embodiments, an outer periphery of the second column is provided with a clearance slot, and at least part of the stopper is folded in the clearance slot when the stopper is arranged in the balance hole together with the second column.

[0015] In one of the embodiments, one end of the stopper is integrally connected with the second column, and the other end of the stopper is suspended in a natural state and is arranged to be inclined towards the first column along the axial direction of the counterweight, so that the stopper is in a barb structure.

[0016] In one of the embodiments, an end of the second column away from the first column is provided with a guide conical surface in the circumferential direction.

[0017] In one of the embodiments, the balance hole is arranged on the inner side of the blade and / or the outer side of the blade in the radial direction of the impeller disc.

[0018] In one of the embodiments, the central angle corresponding to the two adjacent balance holes is 5°-10°.

[0019] The second technical problem is solved by the following technical scheme:

[0020] The outer rotor fan comprises the fan impeller.

[0021] Compared with the background art, the outer rotor fan has the beneficial effects that:

[0022] The impeller disc is provided with a plurality of connecting structures, and the counterweight is detachably connected with the impeller disc through the connecting structures, which on the one hand avoids occupying the air duct space between the blades, and is beneficial to ensuring the air outlet efficiency of the fan impeller, and on the other hand, facilitates the installation of the counterweight on the impeller disc according to the counterweight requirement of the fan impeller, so as to improve the stability of the fan impeller during rotation. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of the outer rotor fan provided by the embodiment of the utility model;

[0024] Figure 2It is the structural schematic view of the fan impeller provided by the embodiment of the utility model.

[0025] Figure 3 It is Figure 2 The partial structure enlarged view of A in the middle;

[0026] Figure 4 It is the front view of the counterweight provided by the embodiment of the utility model.

[0027] The component names and labels in the figure are as follows:

[0028] 10, volute; 20, rotating shaft; 30, magnetic ring;

[0029] 1, impeller disc; 11, framework; 12, disc body; 121, balance hole; 2, blade; 3, counterweight; 31, first column body; 311, step surface; 32, second column body; 321, accommodation slot; 322, guide conical surface; 33, stop portion. DETAILED DESCRIPTION

[0030] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model will be further explained below by combining with the drawings and through specific embodiments. It can be understood that the specific embodiments described here are only used to explain the utility model, not to limit the utility model. In addition, it needs to be explained that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings, not all.

[0031] In the description of the utility model, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] In the utility model, unless explicitly defined and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] In the description of the embodiments, the terms "upper", "lower", "right", "left" and the like orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0034] The technical scheme of the present application will be further illustrated below by specific embodiments in conjunction with the drawings.

[0035] The present application provides an outer rotor fan, which is mainly used in a gas water heater. The outer rotor fan is installed below the combustion chamber to provide sufficient oxygen to the combustion chamber by inhaling external air, thereby ensuring full combustion of the gas. At the same time, the outer rotor fan can also be installed above the combustion chamber, and the flue gas generated by combustion is discharged through the outer rotor fan to prevent the flue gas from accumulating inside the gas water heater. Of course, the outer rotor fan can also be used in other devices, which are not limited here.

[0036] Specifically, as shown in Figure 1 and Figure 2 , the outer rotor fan comprises a volute 10, a rotating shaft 20, a magnetic ring 30 and a fan impeller. The fan impeller is installed in the volute 10, and the fan impeller comprises an impeller disc 1 and blades 2, and the impeller disc 1 is provided with a plurality of blades 2 at intervals in the circumferential direction. Specifically, the impeller disc 1 comprises a skeleton 11 and a disc body 12, the circumferential side of the skeleton 11 is integrally provided with the disc body 12, and the two sides in the thickness direction of the disc body 12 are provided with a plurality of blades 2. On the same side in the thickness direction of the disc body 12, the plurality of blades 2 are arranged at equal intervals in the circumferential direction of the disc body 12. The skeleton 11 is coaxially connected with the rotating shaft 20, and the magnetic ring 30 is fixedly installed in the skeleton 11. The magnetic ring 30 is a multi-pole one-piece injection molded magnetic ring, and the magnetic ring 30 and the rotating shaft 20 are placed in an injection mold, and an injection molded body impeller rotor is generated after injection molding. Since the outer rotor fan is prior art, the specific structure of the outer rotor fan will not be described again.

[0037] 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 amount of the fan impeller during rotation, and then a balance clip or a glue group is added 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.

[0038] To solve the above-mentioned problems, as shown in Figure 2 and Figure 3As shown in the figure, this embodiment also proposes a fan impeller, which further includes a counterweight 3. Multiple connecting structures are spaced circumferentially on the impeller disk 1. The counterweight 3 is detachably connected to the connecting structures to adjust the dynamic balance of the fan impeller during rotation. The multiple connecting structures on the impeller disk 1, and the detachable connection between the counterweight 3 and the connecting structures, avoid occupying the air duct space between the blades 2, thus ensuring the air outlet efficiency of the fan impeller. Furthermore, it facilitates the addition of the counterweight 3 to the impeller disk 1 according to the counterweight requirements of the fan impeller, thereby improving the stability of the fan impeller during rotation.

[0039] It should be noted that the counterweight 3 is made of plastic and its weight can be set in various types, such as 50mg, 100mg, 150mg, etc., to flexibly select different weights of counterweight 3 according to the counterweight requirements of the fan impeller. When the fan impeller or external rotor fan is tested on the balancing testing equipment, due to the weightlessness of the fan impeller, the balancing testing equipment detects the weightlessness at a certain position of blade 2 and displays it on the display screen in the form of angle and coordinates. At this time, simply install the counterweight 3 of the corresponding weight on the connection structure at the corresponding position according to the displayed data, and then retest the fan impeller or external rotor fan until the balance detected by the balancing testing equipment is within the qualified range. The above-mentioned balancing testing equipment is existing technology, and its structure and working process will not be described in detail.

[0040] In one embodiment, the connection structure is a balance hole 121, with multiple balance holes 121 penetrating both sides of the impeller disk 1 in the thickness direction, and the counterweight 3 is detachably connected to the impeller disk 1 through the balance holes 121.

[0041] like Figure 2 As shown, balancing holes 121 are provided on the inner side and / or outer side of the blade 2 along the radial direction of the impeller disk 1. Specifically, balancing holes 121 are provided on both the inner and outer sides of the blade 2. Multiple balancing holes 121 are spaced apart on the inner side of the blade 2 along the circumference of the impeller disk 1, and multiple balancing holes 121 are spaced apart on the outer side of the blade 2 along the circumference of the impeller disk 1, such that each blade 2 has one balancing hole 121 on both its inner and outer sides along the radial direction of the impeller disk 1. In other embodiments, the blade 2 has balancing holes 121 only on its inner side along the radial direction of the impeller disk 1. Alternatively, the blade 2 has balancing holes 121 only on its outer side along the radial direction of the impeller disk 1.

[0042] It should be noted that the central angle of the two adjacent balance holes 121 is 5°-10°. The centers of the plurality of balance holes 121 on the inner side of the blade 2 are connected to form a virtual circle, and the centers of the plurality of balance holes 121 on the outer side of the blade 2 are connected to form another virtual circle, and both virtual circles are concentric with the disc body 12 (or the impeller disc 1). The above-mentioned two adjacent balance holes 121 refer to the balance holes 121 on the inner side of the blade 2 or on the outer side of the blade 2. The central angle of the two adjacent balance holes 121 can be 5°, 6°, 7°, 8°, 9° or 10°, etc. The setting of the above-mentioned central angle not only can avoid the problem of too many balance holes 121 caused by too small central angle, so as to ensure the structural strength of the impeller disc 1, but also makes the adjacent two balance holes 121 have sufficient installation space, so as to facilitate the installation of the counterweight 3 in the corresponding balance hole 121, and avoid the interference when the adjacent two balance holes 121 need to be installed with the counterweight 3.

[0043] As shown in Figure 3 and Figure 4 , the counterweight 3 comprises a first column 31 and a second column 32 connected with each other, and the first column 31 and the second column 32 have a stepped surface 311 therebetween. The outer periphery of the second column 32 is provided with a stop portion 33, the second column 32 is arranged in the corresponding balance hole 121, and the stop portion 33 and the stepped surface 311 are respectively abutted on both sides of the thickness direction of the impeller disc 1. By arranging the counterweight 3 as a stepped shaft structure, the diameter of the first column 31 is greater than the diameter of the second column 32, and the diameter of the first column 31 is greater than the inner diameter of the balance hole 121, so that the stepped surface 311 is abutted on one side of the thickness direction of the impeller disc 1, and at the same time the stop portion 33 is abutted on the other side of the thickness direction of the impeller disc 1, so as to lock the second column 32 in the balance hole 121, thereby realizing the stable installation of the counterweight 3 and avoiding the loosening of the counterweight 3 from the balance hole 121.

[0044] In one embodiment, the stop portion 33 is elastic and integrally connected with the second column 32. Specifically, the first column 31, the second column 32 and the stop portion 33 are integrally formed, which improves the structural strength and processing efficiency of the counterweight 3. By arranging the stop portion 33 as an elastic member, when the stop portion 33 extends into the balance hole 121 with the second column 32, the stop portion 33 is deformed and folded on the outer peripheral surface of the second column 32 under extrusion. When the stop portion 33 passes out of the balance hole 121, the stop portion 33 recovers from the folded state to the natural unfolded state under the action of the elastic restoring force of the stop portion 33 itself, at this time the stop portion 33 is abutted on the other side of the thickness direction of the impeller disc 1. It should be noted that the inner diameter of the balance hole 121 is slightly larger than the diameter of the second column 32, so that there is a small gap between the second column 32 extending into the balance hole 121 and the balance hole 121 for the stop portion 33 to pass through, and it is necessary to avoid the circumferential shaking of the counterweight 3 installed in the balance hole 121 during the rotation of the impeller disc 1.

[0045] As shown in Figure 3 and Figure 4 , the outer periphery of the second cylinder 32 is provided with a clearance slot 321, and at least part of the stop portion 33 is retracted into the clearance slot 321 when the stop portion 33 is inserted into the balance hole 121 along with the second cylinder 32. When the stop portion 33 is inserted into the balance hole 121 along with the second cylinder 32, part or all of the stop portion 33 is retracted into the clearance slot 321 to minimize the space occupied by the stop portion 33 in the balance hole 121, thereby preventing the stop portion 33 from being stuck when the second cylinder 32 passes through the balance hole 121, facilitating the quick installation of the counterweight 3 and improving the installation efficiency of the counterweight 3.

[0046] In this embodiment, one end of the stop portion 33 is integrally connected to the second cylinder 32, and the other end of the stop portion 33 is suspended in a natural state and is inclinedly arranged along the axial direction of the counterweight 3 towards the first cylinder 31, so that the stop portion 33 has a barb structure. The inclined arrangement and barb structure of the stop portion 33 allow the stop portion 33 to be pressed and retracted towards the second cylinder 32 when the stop portion 33 is inserted into the balance hole 121 along with the second cylinder 32, facilitating the accommodation of part or all of the stop portion 33 in the clearance slot 321, so that the second cylinder 32 and the stop portion 33 smoothly pass through the balance hole 121. When the counterweight 3 is installed in place, the stop portion 33 passes out of the balance hole 121 and returns to the unfolded state in the natural state, i.e. the other end of the stop portion 33 (the end away from the second cylinder 32) is suspended and abuts against one side in the thickness direction of the disc body 12, so that the other side in the thickness direction of the disc body 12 abuts against the stepped surface 311, preventing the counterweight 3 from slipping out of the balance hole 121, thereby achieving stable installation of the counterweight 3.

[0047] In one embodiment, as shown in Figure 3 and Figure 4 , the end of the second cylinder 32 away from the first cylinder 31 is provided with a guide cone surface 322 in the circumferential direction. The end of the second cylinder 32 away from the first cylinder 31 is chamfered to form the guide cone surface 322. By providing the guide cone surface 322, the installation process of the counterweight 3 is well guided, so that the counterweight 3 is quickly aligned with the balance hole 121 under the guidance of the guide cone surface 322, reducing the installation difficulty of the counterweight 3 and improving the installation efficiency of the counterweight 3. In one embodiment, the outer periphery of the second cylinder 32 is provided with external threads, and the second cylinder 32 is selectively threadedly connected with the weight-increasing member to increase the weight of the counterweight 3. According to the detection results of the balance detection equipment, weight-increasing members of different weights can be selectively screwed onto the second cylinder 32 to flexibly adjust the total weight of the counterweight 3, thereby meeting the dynamic balance adjustment requirements of the fan impeller, without the need to repeatedly disassemble and assemble the counterweight 3, thereby improving the adjustment efficiency of the dynamic balance.

[0048] In one of the embodiments, the balancing hole 121 is a threaded hole, and the counterweight 3 is a threaded column, which is screwed with the threaded hole.

[0049] In one of the embodiments, the connecting structure is a threaded column, and the counterweight 3 is a nut, which is screwed with the threaded column.

[0050] 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 in that, include: Impeller disk (1), wherein multiple connecting structures are provided at intervals along the circumference; Blade (2), the impeller disk (1) is provided with a plurality of blades (2) at circumferential intervals; The counterweight (3) is detachably connected to the connecting structure to adjust the dynamic balance of the fan impeller when it rotates.

2. The fan impeller according to claim 1, characterized in that, The connection structure is a balance hole (121), which penetrates both sides of the impeller disk (1) in the thickness direction.

3. The fan impeller according to claim 2, characterized in that, The counterweight (3) includes a first column (31) and a second column (32) connected together. There is a stepped surface (311) between the first column (31) and the second column (32). A stop (33) is provided on the outer periphery of the second column (32). The second column (32) passes through the corresponding balance hole (121), and the stop (33) and the stepped surface (311) abut against both sides of the impeller disk (1) in the thickness direction.

4. The fan impeller according to claim 3, characterized in that, The stop (33) is elastic and integrally formed with the second column (32).

5. The fan impeller according to claim 4, characterized in that, The second column (32) is provided with a relief groove (321) on its outer periphery. When the stop part (33) passes through the balance hole (121) along with the second column (32), at least part of the stop part (33) is retracted into the relief groove (321).

6. The fan impeller according to claim 4, characterized in that, One end of the stop part (33) is integrally connected to the second column (32), and the other end of the stop part (33) is suspended in the air in its natural state and is inclined towards the first column (31) along the axis of the counterweight (3) so that the stop part (33) has a barb structure.

7. The fan impeller according to claim 3, characterized in that, The second column (32) has a guide cone surface (322) circumferentially provided at the end away from the first column (31).

8. The fan impeller according to any one of claims 2 to 7, characterized in that, The balance hole (121) is provided on the inner side of the blade (2) and / or the outer side of the blade (2) along the radial direction of the impeller disk (1).

9. The fan impeller according to claim 8, characterized in that, The central angle between two adjacent balance holes (121) is 5° to 10°.

10. An external rotor fan, characterized in that, The impeller includes any one of claims 1 to 9.

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