Double blade fan

Abstract

The present invention discloses a double-group blade fan, comprising a blade hub, a blade ring, a first blade and a second blade. The outer circumferential side of the blade hub is fixed to form a circle of radially outwardly convex blade ring, a plurality of first blades are fixedly arranged on the outer circumferential side of the blade ring to form a first blade group, and a plurality of second blades are fixedly arranged on the outer circumferential side of the blade hub above the blade ring to form a second blade group. The present invention increases the air volume of the blades without increasing the height of the fan, which is beneficial to improving the heat dissipation effect of the fan, and at the same time improves the fixed connection strength between the blades and the blade hub, thereby increasing the life of the fan.

Description

Technical Field

[0001] The invention relates to a fan, in particular to a double-blade fan. Background Art

[0002] The common fan blade design of cooling fans has only one set of blades distributed around the hub. Due to the limited number of blades, the amount of air stirred by this type of cooling fan is small, and the air volume generated is small, which is not conducive to fan heat dissipation. At present, to enhance the heat dissipation effect, the only way is to increase the fan height to increase the blade height. This structure is not conducive to the thin design of the fan. Summary of the invention

[0003] In order to overcome the above-mentioned defects, the present invention provides a double-blade fan, which effectively increases the air volume of the fan without increasing the height of the fan, thereby improving the heat dissipation effect of the fan.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a double-group blade fan, including a blade hub, a blade ring, a first blade and a second blade. The outer side of the circumference of the blade hub is fixed to form a circle of radially outwardly convex blade ring, a plurality of first blades are fixed on the outer side of the circumference of the blade ring to form a first blade group, and a plurality of second blades are fixed on the outer side of the circumference of the blade hub above the blade ring to form a second blade group.

[0005] As a further improvement of the present invention, the blade ring is an annular plate structure.

[0006] As a further improvement of the present invention, an open slot is formed at one end of the first blade, and the blade ring is fixedly embedded in the slot of the first blade.

[0007] As a further improvement of the present invention, the "convex" shaped structure has an outer diameter of the upper end of the impeller hub that is smaller than the outer diameter of the lower end, the blade ring is fixedly sleeved on the outer side of the lower end of the impeller hub with a larger diameter, and the second blade is fixedly covered on the outer circumferential surface of the impeller hub.

[0008] As a further improvement of the present invention, the upper end of the second blade is flush with the upper end surface of the impeller hub, and the opening edge of the lower end of the impeller hub forms an outwardly bent edge, which is fixedly embedded in the second blade.

[0009] As a further improvement of the present invention, the first blade, the blade ring and the second blade are an integrally formed structure.

[0010] As a further improvement of the present invention, the number of the first blades is not less than the number of the second blades.

[0011] As a further improvement of the present invention, the second blades are arranged in a distribution state opposite to or staggered with the first blades.

[0012] As a further improvement of the present invention, a set gap is provided between the circumferential outer side of the second blade assembly and the circumferential inner side of the first blade assembly.

[0013] As a further improvement of the present invention, a plurality of hollow structures are provided on the blade ring.

[0014] The beneficial effects of the present invention are as follows: the present invention provides a circle of blade rings on the impeller hub, designs the first blades to be arranged at intervals on the blade ring, and provides second blades that are relatively independent of the first blades on the outer side of the impeller hub. The second blades extend from the upper end surface of the impeller hub to the periphery and are covered on the outer side of the impeller hub. The second blades are also fixedly connected to the blade ring to form a whole, thereby achieving firm fixation of the first blade and the second blade, and preventing the blades from falling off during the operation of the fan. The present invention increases the air volume of the blades without increasing the height of the fan, which is beneficial to improving the heat dissipation effect of the fan, while improving the fixed connection strength between the blades and the impeller hub, thereby increasing the life of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the structural principle of the prior art;

[0016] Figure 2 It is the main view of the structural principle of the prior art;

[0017] Figure 3 It is a three-dimensional diagram of the first structural principle of the present invention;

[0018] Figure 4 This is a front view of the first structural principle of the present invention;

[0019] Figure 5 It is a top view of the first structural principle of the present invention;

[0020] Figure 6 It is a schematic diagram of the fan blade structure principle of the present invention;

[0021] Figure 7 It is a front view of the second structural principle of the present invention.

[0022] Blade hub---1 First blade---2 Blade ring---3

[0023] Second blade---4 Hollow structure---5 DETAILED DESCRIPTION

[0024] Embodiment: A double-group blade fan comprises a blade hub 1, a blade ring 3, first blades 2 and second blades 4. The outer circumference of the blade hub 1 is fixed to form a circle of radially outwardly protruding blade ring 3, a number of first blades 2 are fixed on the outer circumference of the blade ring 3 to form a first blade group 2, and a number of second blades 4 are fixed on the outer circumference of the blade hub 1 above the blade ring 3 to form a second blade group 4.

[0025] With the fan height unchanged, four groups of second blades are added to the fan hub 1. The second blades work together with the first blades to increase the amount of air agitation when the fan blades are running, which is beneficial to increasing the air volume. The second group of blades are connected to the blade ring 3 to increase the overall structural strength and will not fall off due to insufficient bonding force with the fan hub 1.

[0026] The blade ring 3 is an annular plate structure.

[0027] An open slot is formed at one end of the first blade 2 , and the blade ring 3 is fixedly embedded in the slot of the first blade 2 .

[0028] The blade hub 1 is a "convex" shaped structure in which the outer diameter of the upper end is smaller than the outer diameter of the lower end, the blade ring 3 is fixedly sleeved on the outer side of the lower end of the blade hub 1 with a larger diameter, and the second blade 4 is fixedly covered on the outer circumferential surface of the blade hub 1. This structure makes the contact area between the blade and the blade hub 1 large, the connection strength is large, and the blade is prevented from falling off.

[0029] The upper end of the second blade 4 is flush with the upper end surface of the impeller hub 1, and the lower end opening edge of the impeller hub 1 forms an outward bending edge, which is fixedly embedded in the second blade. The second blade 4 grows from the upper end surface of the impeller hub 1 to the outer circumference, and extends a certain length to grow downward from the outer circumference of the impeller hub 1 to form a second blade 4 group surrounding the upper surface and outer circumference of the impeller hub 1. The second blade 4 of this structure is embedded and connected to the impeller hub 1, and the connection strength is large.

[0030] The first blade, blade ring 3 and second blade are integrally formed. The second blade group 4 and the first blade group are connected to the annular blade ring 3 on the outer periphery of the blade hub 1 to form a whole, and the connection strength is strong.

[0031] The number of the first blades 2 is not less than the number of the second blades 4 .

[0032] The second blades 4 and the first blades 2 are arranged in a distribution state of being opposite or staggered.

[0033] There is a set gap between the outer circumference of the second blade group 4 and the inner circumference of the first blade group 2. The blades of the second blade group are not connected to the blades of the first blade group, and an air flow channel can be formed between the two. The first blade 2 and the second blade 4 act separately without affecting each other.

[0034] The blade ring 3 is provided with a plurality of hollow structures 5. The shape of the hollow structures 5 is set according to design requirements, and the hollow structures 5 can reduce the weight of the fan, and at the same time are conducive to air flow and enhance the heat dissipation effect of the fan.

Claims

1. A double-blade fan, characterized in that: The invention comprises a blade hub (1), a blade ring (3), a first blade (2) and a second blade (4), wherein the outer circumferential side of the blade hub is fixed to form a circle of radially outwardly convex blade ring, a plurality of first blades are fixedly arranged on the outer circumferential side of the blade ring to form a first blade group, a plurality of second blades are fixedly arranged on the outer circumferential side of the blade hub above the blade ring to form a second blade group, the outer diameter of the upper end of the blade hub is smaller than the outer diameter of the lower end, the blade ring is fixedly sleeved on the outer side of the lower end of the blade hub with a larger diameter, the second blade is fixedly covered on the outer circumferential side of the blade hub, the upper end of the second blade is flush with the upper end surface of the blade hub, the open edge of the lower end of the blade hub forms an outwardly bent edge, the outwardly bent edge is fixedly embedded in the second blade, one end of the first blade forms an open slot, and the blade ring is fixedly embedded in the slot of the first blade.

2. The double-blade fan according to claim 1, characterized in that: The blade ring is an annular plate structure.

3. The double-blade fan according to claim 1, characterized in that: The first blade, the blade ring and the second blade are an integrally formed structure.

4. The double-blade fan according to claim 1, characterized in that: The number of the first blades is not less than the number of the second blades.

5. The double-blade fan according to claim 1, characterized in that: The second blades are arranged in a distribution state opposite to or staggered with the first blades.

6. The double-blade fan according to claim 1, characterized in that: A set gap is provided between the outer circumferential side of the second blade group and the inner circumferential side of the first blade group.

7. The double-blade fan according to claim 1, characterized in that: The blade ring is provided with a plurality of hollow structures (5).

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