Axial flow fan with adjustable blade number

Abstract

The axial flow fan comprises an outer rotor motor and an impeller driven by the outer rotor motor, the impeller comprises a hub, a plurality of blades and a plurality of lug blocks, an annular installation groove is formed in the periphery of the hub, the lug blocks are detachably distributed in the installation groove at intervals, and the outer rotor motor drives the impeller to rotate. The blades are detachably fixed to the corresponding lug blocks, the blade mounting structure further comprises a plurality of limiting blocks detachably embedded in the mounting grooves, and the limiting blocks are distributed between the lug blocks at intervals and attached to the adjacent lug blocks. According to the utility model, for different use scenes, only the lug blocks and the blades with the corresponding number need to be selected, and then the limiting blocks matched with the spacing of the adjacent lug blocks are selected, so that each lug block is clamped by the two adjacent limiting blocks to prevent the lug blocks from shaking, and the purpose of preventing the blades from shaking is achieved. Therefore, the hubs can be set to be of the same specification, and the enterprise cost is reduced. The structure is reasonable, use is convenient and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to an axial flow fan with adjustable blade quantity. Background Art

[0002] An axial flow fan is an airflow that flows in the same direction as the axis of the blades. For example, electric fans and air conditioner outdoor fans are axial flow fans. The main feature of an axial flow fan is that the gas flows parallel to the fan axis, hence the name "axial flow". The impeller in an axial flow fan consists of a hub and multiple blades fixed to the hub. The number of blades ranges from 6 to 14. At the same speed, an axial flow fan with a larger number of blades can produce a more uniform and stable airflow, thereby improving overall efficiency.

[0003] Due to differences in user usage scenarios, even axial flow fans of the same power may be equipped with different impellers. Different impellers will result in different numbers of blades, which in turn requires companies to produce and stock impellers with different numbers of blades to ensure that the blades installed on the impellers are suitable for actual usage scenarios. Therefore, even for fans of the same power, impellers with different numbers of blades must be produced and stocked according to the number of blades. This makes the impeller stocking cumbersome on the one hand, and the manufacturing cost of the fan high on the other. Utility Model Content

[0004] The utility model aims to provide an axial flow fan with adjustable blade quantity, which only needs to produce and stock impellers with the same structure, which not only simplifies the stocking of impellers but also reduces the manufacturing cost of the fan.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] An axial flow fan with adjustable blade quantity comprises an outer rotor motor and an impeller driven by the outer rotor motor, wherein the impeller comprises a hub, a plurality of blades and a plurality of ear blocks, an annular mounting groove is formed on the circumference of the hub, a plurality of ear blocks are detachably distributed at intervals in the mounting groove, the blades are detachably fixed to corresponding ear blocks, and the impeller further comprises a plurality of limit blocks detachably embedded in the mounting groove, wherein the limit blocks are spaced between the ear blocks and are attached to adjacent ear blocks.

[0007] By adopting the above technical solution, a mounting groove is opened on the circumference of the hub, and a plurality of limit blocks and a plurality of ear blocks are arranged alternately and installed in the mounting groove, and the blades are fixed on the corresponding ear blocks. Therefore, for different usage scenarios, it is only necessary to select ear blocks and blades that can meet the required number, and then select limit blocks that are adapted to the spacing between adjacent ear blocks, so that each ear block is clamped by two adjacent limit blocks to prevent the ear block from shaking, so as to achieve the purpose of preventing the blades from shaking. In this way, in actual production, fans with the same power can set the impeller hub to the same specifications, which not only simplifies the stocking of the impeller, but also helps to reduce the manufacturing cost of the fan.

[0008] As a further solution of the utility model: the wheel hub includes a lower wheel hub disc and an upper wheel hub disc detachably connected to the lower wheel hub disc, and a first annular groove opened at the upper end of the lower wheel hub disc and a second annular groove opened at the lower end of the upper wheel hub disc form the installation groove.

[0009] As a further solution of the utility model: the ear block is installed in the installation groove through a fixing structure.

[0010] As a further solution of the utility model: the fixing structure includes an annular lower groove arranged on the edge of the upper surface of the lower hub disc, and an annular upper groove arranged on the bottom surface of the upper hub disc corresponding to the position of the lower groove, and the upper and lower ends of the ear block have outwardly extending plug blocks, and the upper and lower plug blocks are respectively inserted into the lower groove and the upper groove.

[0011] As a further solution of the utility model: the lower groove and the upper groove are both embedded with the limit blocks of corresponding quantity and position, and the limit blocks are spaced and distributed between the insertion blocks and are attached to each other.

[0012] As a further solution of the utility model: support parts are provided on both sides of the ear block on the insertion block, and the two ends of the limit block are respectively placed on the support parts of the adjacent ear blocks.

[0013] As a further solution of the utility model: the ear block is made of steel.

[0014] In summary, in the utility model, a mounting groove is provided on the circumference of the hub, a plurality of limit blocks and a plurality of ear blocks are arranged alternately and installed in the mounting groove, and the blades are fixed on the corresponding ear blocks. Therefore, for different usage scenarios, a fan of the same power only needs to select a corresponding number of ear blocks and blades, and then select a limit block that matches the spacing between adjacent ear blocks, so that each ear block is clamped by two adjacent limit blocks to prevent the ear block from shaking, so as to achieve the purpose of preventing the blades from shaking. In this way, fans of the same power can set the hub of the impeller to the same specification, thereby reducing enterprise costs. The structure is reasonable, easy to use, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings.

[0016] Figure 1 This is a structural schematic diagram of an axial flow fan with adjustable blade quantity according to the utility model;

[0017] Figure 2 It shows that the ear block is inserted into the lower groove of the lower hub plate and is located between the various limit blocks;

[0018] Figure 3 It shows that the two ends of the limit block are placed on the support part on the upper side of the adjacent ear block;

[0019] Figure 4 It is a structural schematic diagram of the ear block of the utility model;

[0020] Figure 5 It is a structural schematic diagram of the limit block of the utility model;

[0021] Figure 6 It is a structural schematic diagram of the wheel hub of the utility model. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1 As shown, the utility model is an axial flow fan with adjustable blade number, comprising an outer rotor motor (not shown in the figure) and an impeller 10 driven by the outer rotor motor. The impeller 10 comprises a hub 9, a plurality of blades 11 and a plurality of limit blocks 17.

[0024] like Figure 1 and Figure 6 As shown, the wheel hub 9 includes a lower wheel hub disc 13 and an upper wheel hub disc 14 detachably connected to the lower wheel hub disc 13. A first annular groove 131 is formed at the upper end of the lower wheel hub disc 13. A second annular groove 141 is formed at the lower end of the upper wheel hub disc 14. The first annular groove 131 and the second annular groove 141 form a mounting groove 15. A plurality of ear blocks 16 are detachably installed at intervals in the mounting groove 15. Each blade 11 is detachably fixed to a corresponding ear block 16. In this embodiment, the ear block 16 is made of steel.

[0025] like Figure 1 , Figure 4 and Figure 6As shown in the figure, the ear block 16 is installed in the installation groove 15 through a fixing structure. The fixing structure includes an annular lower groove 132 provided on the edge of the upper surface of the lower hub plate 13, and an annular upper groove (not shown in the figure) provided on the bottom surface of the upper hub plate 14 and corresponding to the position of the lower groove 132. The upper and lower ends of the ear block 16 have an insert block 161 extending outwards and capable of being inserted into the lower groove 132 and the upper groove respectively. Figure 5 As shown, the insert block 161 is in a fan-shaped structure.

[0026] like Figure 1-6 As shown, in this embodiment, the lower groove 132 and the upper groove are both embedded with corresponding number and position of the limiting blocks 17, and each limiting block 17 is spaced and distributed between each plugging block 161 and is in close contact with each other. With the above technical solution, according to the actual situation, the matching limiting blocks 17 are selected and embedded in the upper and lower grooves and arranged alternately with the plugging blocks 161 and are in close contact with each other, so that each plugging block 161 is clamped by two adjacent limiting blocks 17 to prevent the ear block 16 from shaking.

[0027] It should be noted that the number of blades will directly affect the airflow effect and efficiency of the fan. That is to say, an axial flow fan with a large number of blades can produce a more uniform and stable airflow at the same speed, thereby improving the overall efficiency. Therefore, when selecting the number of blades, it is necessary to weigh the pros and cons of the number of blades according to the specific application scenario and requirements to achieve the best performance and cost-effectiveness. With the above technical solution, the ear block 16 can be detachably installed in the mounting groove 15. In this way, by increasing or decreasing the spacing between adjacent ear blocks 16, the number of ear blocks 16 in the mounting groove 15 can be increased or decreased to achieve the purpose of increasing or decreasing the number of blades 11. Then, according to the actual spacing between adjacent ear blocks 16, an adapted limit block 17 is selected to be embedded in the groove and arranged alternately with the plug block 161 of the ear block 16 and attached to each other, so that the plug block 161 of each ear block 16 is clamped by two adjacent limit blocks 17 to prevent the ear block 16 from shaking. In this way, in actual production, the fan with the same power can set the hub of the impeller to the same specification, thereby reducing the cost of the enterprise.

[0028] like Figure 3 and Figure 4 As shown, support portions 162 are provided on both sides of the ear block 16 on the plug block 161. During assembly, the two ends of each upper limit block 17 are respectively placed on the support portions 162 of the adjacent ear block 16. In this embodiment, the thickness of the limit block 17 is the same as that of the plug block 161, and is adapted to the groove depth of the upper and lower grooves. In this way, when the upper hub disc 14 and the lower hub disc 13 are engaged together, the ear block 16 is pressed tightly to prevent the ear block from moving up and down. At the same time, since the thickness of the limit block 17 is the same as that of the plug block 161, the support portion 162 of the ear block 16 presses the limit block 17 to prevent the limit block 17 from falling off and shaking up and down.

[0029] During assembly, the corresponding number of blades is selected according to the specific application scenario and requirements, and the stopper 17 of suitable size is selected. Then, the blade 11 is fixed to the corresponding ear block 16 by screws. Figure 2 As shown, then, a plurality of limit blocks 17 are inserted into the lower groove 132, and then each ear block 16 is inserted into the lower groove 132 and located between each limit block 17. Figure 3 As shown, the remaining limit blocks 17 are then placed on the support portions 162 on the upper sides of the adjacent ear blocks 16 and are located between the insert blocks 161 of the adjacent ear blocks 16. At this time, all the insert blocks 161 and limit blocks 17 on the upper side form a circular ring. In this way, when the upper hub plate 14 and the lower hub plate 13 are engaged together, all the insert blocks 161 and limit blocks 17 on the upper side are just inserted into the upper groove of the upper hub plate 14. Figure 1 As shown, finally, the upper hub disc 14 and the lower hub disc 13 are fixed together by bolts to complete the assembly.

[0030] In summary, in the utility model, a mounting groove is provided on the circumference of the hub, the limit blocks and the ear blocks are arranged alternately and installed in the mounting groove, and the blades are fixed on the corresponding ear blocks. Therefore, for different usage scenarios, it is only necessary to select a corresponding number of ear blocks and blades, and then select a limit block that matches the spacing between adjacent ear blocks, so that each ear block is clamped by two adjacent limit blocks to prevent the ear block from shaking, so as to achieve the purpose of preventing the blades from shaking. In this way, fans with the same power can set the hub of the impeller to the same specification, thereby reducing enterprise costs. The structure is reasonable, easy to use, and low cost.

[0031] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. An axial flow fan with adjustable blade number, comprising an outer rotor motor, an impeller driven by the outer rotor motor, the impeller comprising a hub, a plurality of blades and a plurality of lugs, characterized in that: An annular mounting groove is provided on the circumference of the wheel hub, and a plurality of ear blocks are detachably distributed at intervals in the mounting groove. The blades are detachably fixed to the corresponding ear blocks, and also include a plurality of limit blocks detachably embedded in the mounting groove, and each limit block is spaced between each ear block and attached to the adjacent ear blocks.

2. The axial flow fan with adjustable blade quantity according to claim 1, characterized in that: The wheel hub comprises a lower wheel hub disc and an upper wheel hub disc detachably connected to the lower wheel hub disc, wherein a first annular groove opened at the upper end of the lower wheel hub disc and a second annular groove opened at the lower end of the upper wheel hub disc form the mounting groove.

3. The axial flow fan with adjustable blade quantity according to claim 2, characterized in that: The ear block is installed in the installation groove through a fixing structure.

4. The axial flow fan with adjustable blade quantity according to claim 3, characterized in that: The fixing structure includes an annular lower groove arranged on the edge of the upper surface of the lower hub disc, and an annular upper groove arranged on the bottom surface of the upper hub disc corresponding to the position of the lower groove. The upper and lower ends of the ear block have outwardly extending plug blocks, and the upper and lower plug blocks are respectively inserted into the lower groove and the upper groove.

5. The axial flow fan with adjustable blade quantity according to claim 4, characterized in that: The lower groove and the upper groove are both embedded with the limiting blocks of corresponding quantity and position, and the limiting blocks are spaced and distributed between the inserting blocks and are attached to each other.

6. The axial flow fan with adjustable blade quantity according to claim 5, characterized in that: The ear block is provided with support parts on both sides of the inserting block, and the two ends of the upper limit block are respectively placed on the support parts of the adjacent ear blocks.

7. The axial flow fan with adjustable blade quantity according to claim 6, characterized in that: The limiting block is a fan-shaped structure, the inserting block is a fan-shaped structure, the thickness of the limiting block is the same as the thickness of the inserting block, and is adapted to the groove depth of the groove.

8. The axial flow fan with adjustable blade quantity according to claim 1, characterized in that: The ear block is made of steel.

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