Pressurizing blower fan

Abstract

A pressurizing blowing fan comprises a shell, a fan blade, two air inlets, an air outlet, a throat portion, two bosses and a pressurizing channel, the shell comprises two cover bodies and a surrounding portion, the fan blade can rotate relative to the shell and comprises a wheel shaft portion and a plurality of blades, the two air inlets are formed in the two cover bodies respectively, the air outlet is formed between the two cover bodies, and the throat portion is located between the two bosses. The throat portion is adjacent to the air outlet, the two bosses are arranged on the two cover bodies in a protruding mode respectively, extend towards the fan blades in a protruding mode and are opposite to each other, the two bosses are located between the two air inlets and the throat portion, the compression channel with the small distance is formed between the two bosses, the pressure of airflow can be increased, and then the air pressure and the air volume are improved.

Description

Technical Field

[0001] The invention relates to a blower fan, and in particular to a blower fan capable of increasing output wind pressure. Background Art

[0002] Please refer to Fig.12 The conventional blower fan 90 mainly includes a fan blade 91 and a shell 93. The fan blade 91 is rotatably mounted on the shell 93. The shell 93 has two covers 931, a surrounding portion 933 connecting the two covers 931, and a receiving chamber. The two covers 931 respectively have two air inlets 932, and an air outlet 934 is formed between the two covers 931. The shell 93 has a throat 935 near the air outlet 934.

[0003] When the fan blade 91 rotates, it can compress the air when passing through the throat 935, forming a pressure difference, driving the external air to enter the shell 93 from the two air inlets 932 located on the opposite sides of the shell 93, and flow out from the air outlet 934 through the guidance of the blades of the fan blade 91.

[0004] Since the distance between the throat 935 and each air inlet 932 is relatively short, the pressure generated is relatively small, so that the output wind pressure and air volume are limited. Summary of the invention

[0005] In view of the above-mentioned deficiencies, the main purpose of the present invention is to provide a booster blower fan, wherein a compression channel is provided between the air inlet and the throat of the shell to increase the output wind pressure.

[0006] In order to achieve the above-mentioned purpose, the booster blower provided by the present invention comprises:

[0007] A housing, the housing comprising two covers located at opposite sides, a surrounding portion connecting the two covers, and a receiving chamber formed between the two covers and the surrounding portion;

[0008] a fan blade, the fan blade is located in the accommodation chamber of the housing and can rotate relative to the housing, the fan blade includes a wheel shaft portion and a plurality of blades extending outward from the wheel shaft portion;

[0009] Two air inlets, the two air inlets are respectively opened on the two covers and communicated with the accommodation chamber;

[0010] An air outlet is formed between the two covers and communicated with the accommodation chamber;

[0011] a throat portion extending into the accommodating chamber, located at the periphery of the fan blade and adjacent to the air outlet;

[0012] Two bosses, the two bosses are respectively protruded from the two covers, protrude toward the fan blade and face each other, and are located between the two air inlets and the throat; and

[0013] A compression channel is formed between the two bosses.

[0014] In one embodiment of the present invention, each blade has a neck portion adjacent to the hub portion and a paddle portion located at a side of the neck portion away from the hub portion, and a width of the neck portion is smaller than a width of the paddle portion.

[0015] In one embodiment of the present invention, each boss is arc-shaped and surrounds between the outer periphery of the hub portion and the inner periphery of the paddle portions of the plurality of blades.

[0016] In one embodiment of the present invention, each boss has an end surface and an inclined surface, wherein the end surface faces the fan blade, the inclined surface faces the surrounding portion, and extends obliquely from the end surface toward the corresponding cover body.

[0017] In one embodiment of the present invention, an angle formed by the axis of the wheel shaft portion to two opposite ends of each boss is greater than or equal to 45 degrees and less than or equal to 180 degrees.

[0018] In one embodiment of the present invention, the distance between the two bosses is less than or equal to the width of the paddle portion of each blade.

[0019] In an embodiment of the present invention, at least one of the protrusions has a recessed portion on a side away from the fan blade.

[0020] In one embodiment of the present invention, at least one of the bosses is a solid block.

[0021] In one embodiment of the present invention, the surrounding portion of the shell is integrally formed with one of the covers.

[0022] In one embodiment of the present invention, each boss is integrally formed with the corresponding cover.

[0023] When the fan blade rotates, the fan blade can compress the air when passing through the throat, forming a pressure difference, driving the external air to enter the accommodating chamber from the two air inlets located on the opposite sides of the shell, and flow out from the air outlet. Since the two bosses are provided between the two air inlets and the throat, and the compression channel with a smaller distance is formed between the two bosses, the pressure of the airflow can be increased, thereby improving the wind pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A three-dimensional appearance diagram of a first preferred embodiment of the present invention;

[0025] Figure 2 Another example of the external appearance of the first preferred embodiment of the present invention;

[0026] Figure 3 It is a three-dimensional exploded view of a first preferred embodiment of the present invention;

[0027] Figure 4 A top view of a first preferred embodiment of the present invention;

[0028] Figure 5 It is a top view of the first preferred embodiment of the present invention, with one of the covers removed;

[0029] Figure 6 A bottom view of a first preferred embodiment of the present invention;

[0030] Figure 7 The first preferred embodiment of the present invention is Figure 4 The cross-sectional view of the AA cutting line in ;

[0031] Figure 8 It is a three-dimensional exploded view of a second preferred embodiment of the present invention;

[0032] Fig. 9 It is a partial cross-sectional side view of a second preferred embodiment of the present invention;

[0033] Fig.10 It is a partial cross-sectional side view of a third preferred embodiment of the present invention;

[0034] Fig.11 A comparison chart of air volume and static pressure characteristic curves of the booster blower fan of the present invention and a conventional blower fan;

[0035] Fig.12 It is a top view of a conventional blower fan.

[0036]

Explanation of symbols

[0037] 100,100A,100B: Booster fan

[0038] 10,10A: Shell

[0039] 11,13: Cover

[0040] 112,132: Air inlet

[0041] 12: Air outlet

[0042] 15: Enclosure

[0043] 152:Connection hole

[0044] 155: Throat

[0045] 17,19,19B: Boss

[0046] 171,191: End face

[0047] 172,192: Depression

[0048] 173,193: Incline

[0049] 20: Fan blade

[0050] 21: Axle

[0051] 23: Blade

[0052] 233: Neck

[0053] 235:Paddle Department

[0054] 30: Fasteners

[0055] A: Axis

[0056] θ1,θ2: Angle

[0057] 90: Blower

[0058] 91: Fan blade

[0059] 93: Shell

[0060] 931: Cover

[0061] 932: Air inlet

[0062] 933: Enclosure

[0063] 934: Air outlet

[0064] 935: Throat DETAILED DESCRIPTION

[0065] Please refer to Figures 1 to 7 The first preferred embodiment of the boost blower fan 100 of the present invention includes a housing 10, a fan blade 20, two air inlets 112, 132, an air outlet 12, a throat 155, two bosses 17, 19, and a compression passage.

[0066] The housing 10 includes two covers 11, 13, a surrounding portion 15, and a receiving chamber; the two covers 11, 13 are respectively located at opposite sides of the housing 10. The surrounding portion 15 connects the two covers 11, 13, and the receiving chamber is formed between the two covers 11, 13 and the surrounding portion 15. In the first preferred embodiment, the two covers 11, 13 and the surrounding portion 15 are separate components and are fastened by a plurality of fasteners 30.

[0067] The fan blade 20 is located in the accommodation chamber of the housing 10 and can rotate relative to the housing 10. The fan blade 20 is connected to a driving motor and can be driven by the driving motor to rotate relative to the housing 10. The fan blade 20 includes a wheel shaft portion 21 and a plurality of blades 23. The wheel shaft portion 21 is connected to the driving motor, wherein a driving motor can be installed in the wheel shaft portion 21, and the driving motor is used to drive the fan blade 20 to rotate; the plurality of blades 23 extend outward from the wheel shaft portion 21 and are arranged radially. Each blade 23 has a neck portion 233 and a paddle portion 235, the neck portion 233 is adjacent to the wheel shaft portion 21, the paddle portion 235 is located on the side of the neck portion 233 away from the wheel shaft portion 21, and the width of the neck portion 233 is smaller than the width of the paddle portion 235.

[0068] The two air inlets 112 and 132 are respectively opened in the two covers 11 and 13 and are connected to the accommodating chamber. The air outlet 12 is formed between the two covers 11 and 13 and is connected to the accommodating chamber. The throat 155 extends into the accommodating chamber, is located at the periphery of the fan blade 20, and is adjacent to the air outlet 12.

[0069] The two bosses 17, 19 are respectively convexly disposed on the two covers 11, 13, protruding toward the fan blade 20 and facing each other, and are located between the two air inlets 112, 132 and the throat 155. The compression channel is formed between the two bosses 17, 19. Preferably, each boss 17, 19 is arc-shaped, surrounding between the outer periphery of the hub portion 21 and the inner periphery of the paddle portion 235 of the plurality of blades 23, and located at a position corresponding to the neck 233 of the plurality of blades 23; preferably, the distance between the two bosses 17, 19 is less than or equal to the width of the paddle portion 235 of each blade 23. Each boss 17, 19 has an end face 171, 191 and an inclined surface 173, 193, the end face 171 faces the fan blade 20, the inclined surface 173, 193 faces the surrounding portion 15, and extends obliquely from the end face 171 toward its corresponding cover body 11, 13, and the distance between the end faces 171, 191 of the two bosses 17, 19 is less than or equal to the width of the paddle portion 235 of each blade 23.

[0070] Preferably, the angles θ1 and θ2 formed between the axis A of the wheel axle portion 21 and the two opposite ends of each boss 17 and 19 are greater than or equal to 45 degrees and less than or equal to 180 degrees.

[0071] In the first preferred embodiment, each boss 17, 19 is integrally formed with the corresponding cover 11, 13, and each boss 17, 19 has a recessed portion 172, 192 on a side away from the fan blade 20, so that each boss 17, 19 forms a thin shell shape.

[0072] Please refer to Figure 8 and Fig. 9In the second preferred embodiment, the surrounding portion 15A of the shell 10A of the boost blower fan 100A is integrally formed with one of the covers 13A to form a lower shell, and the other cover 11 is covered on the other side of the surrounding portion 15, and the cover 11 is fixed to the lower shell by using multiple fasteners 30. The surrounding portion 15 is provided with multiple holes 152 connected to the multiple fasteners 30, and each connection hole 152 is a blind hole.

[0073] Please refer to Fig.10 In the third preferred embodiment, at least one boss 19B of the booster fan 100B is a solid block, which can be integrally formed with the cover 13B, or combined with its corresponding cover 13B by means of a covering arrangement, or at least one boss 17 has a recessed portion 172 on the side away from the fan blade 20, or one boss 19B is a solid block, and another boss 17 has a recessed portion 172 on the side away from the fan blade. In other embodiments, each boss can be formed on its corresponding cover by stamping, forging, cutting, joining, etc.

[0074] Please refer to Figure 1 , Figure 2 ,and Figure 7 When the fan blade 20 rotates in the accommodating chamber, a pressure difference is formed when the fan blade 20 passes through the throat 155, driving the external air to enter the accommodating chamber from the two air inlets 112, 132 located on the opposite sides of the shell 10, 10A, and flow out from the air outlet 12. Since the two bosses 17, 19 are provided between the two air inlets 112, 132 and the throat 155, and the compression channel with a smaller distance is formed between the two bosses 17, 19, the pressure of the air flow and the wind pressure can be increased.

[0075] For example, the booster fan 100 of the present invention with the same specifications is tested by a wind tunnel device (such as Figure 1 As shown) and conventional blower fan 90 (as shown Fig.12 The obtained air volume and static pressure characteristic curve (PQ Curve) is shown in the table below. Fig.11 As shown in the figure, the horizontal coordinate (CFM) represents the air volume, and the vertical coordinate (mmAq) represents the wind pressure (static pressure). The data measured by the booster blower fan 100 of the present case is represented by a solid line, and the data measured by the conventional blower fan 90 is represented by a dotted line. According to the experimental results, the maximum static wind pressure of the booster blower fan 100 of the present case is 11.23 mmAq, which is greater than the maximum static wind pressure of the conventional blower fan 90 of 9.64 mmAq, and under the same air volume, the wind pressure of the booster blower fan 100 of the present case can be greater than the wind pressure of the conventional blower fan 90, and under the same wind pressure, the air volume of the booster blower fan 100 of the present case can be greater than the air volume of the conventional blower fan 90.

[0076] For example, when the booster blower 100 of the present invention and a conventional blower are subjected to noise tests in an anechoic chamber that complies with ISO3744 / 3745 standards, the blower speed is 4500RPM, and the sound receiving position is 0.2 meters, the noise level measured by the booster blower 100 of the present invention is 35dB(A), and the noise level measured by the conventional blower is 34.9dB(A). It can be seen from the noise test that the booster blower 100 of the present invention has a structure of a compression channel formed between the two bosses 17 and 19, and the noise volume generated is quite close to that of the conventional blower 90.

[0077] In summary, the booster blower fan 100 of the present invention can form a local compression channel between the air inlets 112 , 132 and the throat 155 , thereby increasing the output wind pressure without significantly increasing the volume of noise.

Claims

1. A booster blower fan, characterized in that: It includes: A housing, the housing comprising two covers located at opposite sides, a surrounding portion connecting the two covers, and a receiving chamber formed between the two covers and the surrounding portion; a fan blade, the fan blade is located in the accommodation chamber of the housing and can rotate relative to the housing, the fan blade includes a wheel shaft portion and a plurality of blades extending outward from the wheel shaft portion; Two air inlets, the two air inlets are respectively opened on the two covers and communicated with the accommodation chamber; an air outlet formed between the two covers and connected to the accommodation chamber; a throat portion extending into the accommodating chamber, located at the periphery of the fan blade and adjacent to the air outlet; Two bosses, the two bosses are respectively protruded from the two covers, protrude toward the fan blade and face each other, and are located between the two air inlets and the throat; and A compression channel is formed between the two bosses.

2. The booster blower fan according to claim 1, characterized in that: Each blade has a neck portion adjacent to the hub portion and a paddle portion located at a side of the neck portion away from the hub portion, and the width of the neck portion is smaller than the width of the paddle portion.

3. The booster blower fan according to claim 2, characterized in that: Each boss is arc-shaped and surrounds the outer periphery of the wheel shaft portion and the inner periphery of the paddle portion of the plurality of blades.

4. The booster blower fan according to claim 3, characterized in that: Each boss has an end surface and an inclined surface, wherein the end surface faces the fan blade, the inclined surface faces the surrounding portion, and extends obliquely from the end surface toward the corresponding cover body.

5. The booster blower fan according to claim 3, characterized in that: The angle formed by the axis of the wheel shaft portion to the two opposite ends of each boss is greater than or equal to 45 degrees and less than or equal to 180 degrees.

6. The booster blower fan according to claim 2, characterized in that: The distance between the two bosses is less than or equal to the width of the paddle portion of each blade.

7. The booster blower according to any one of claims 1 to 6, characterized in that: At least one of the protrusions has a recessed portion on a side away from the fan blade.

8. The booster blower according to any one of claims 1 to 6, characterized in that: At least one of the bosses is a solid block.

9. The booster blower according to any one of claims 1 to 6, characterized in that: The surrounding portion of the shell is integrally formed with one of the covers.

10. The booster blower fan according to any one of claims 1 to 6, characterized in that: Each boss is integrally formed with the corresponding cover body.

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