Forward centrifugal wind wheel and forward centrifugal fan with one-way air inlet

Abstract

The forward centrifugal wind wheel comprises a wheel disc and a plurality of blades, the blades are distributed on the wheel disc in the circumferential direction, a hub is arranged on the inner side of the wheel disc, an air channel is formed between every two adjacent blades, an air inlet of the wind wheel is formed in the inner side of each air channel, and an air outlet of the wind wheel is formed in the outer side of each air channel. The impeller is characterized in that the impeller disc is annular and comprises an inclined main plate portion located on the outer side and an air guide portion located on the inner side, the section of the main plate portion inclines upwards from outside to inside, and the section of the air guide portion is in an arc shape bent from top to bottom. Air flow turbulence and vortex formation in the middle of the wind wheel are effectively improved, noise is low, and wind wheel efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a forward centrifugal wind wheel and a forward centrifugal fan with unidirectional air intake. Background Art

[0002] Forward centrifugal fans have the advantages of high pressure air volume, compact design, high efficiency and energy saving, low noise and vibration, and are widely used in air conditioning systems, purifiers, dehumidifiers and other household appliances. As a fan drive device, inner rotor motors have the advantages of high efficiency, energy saving, high power density, fast start-up and response, and low noise and vibration. These characteristics make inner rotor motors an ideal choice for many household appliances.

[0003] In household appliances, due to the compact internal space of the forward centrifugal fan with one-way air intake, the inner rotor motor needs to invade the interior of the forward centrifugal fan, and the impeller hub protrudes, blocking the fan inlet; at the same time, the blockage is most serious at the intersection of the blades, the disc, and the hub, thereby reducing the actual effective working area of ​​the blades, resulting in a decrease in air volume and low fan efficiency.

[0004] In view of this, the patent number is CN204175640U and the name is: Forward centrifugal wind wheel solves the above technical problems, that is, the wheel disc is located in the middle position of the two axial ends of the blade (2), improving the blockage at the intersection of the blade, the wheel disc and the hub, increasing the air volume, and improving the efficiency of the fan. However, the structure still has the following problems: there is no flow guidance for the airflow flowing from the upper side to the lower side of the wind wheel, the turbulence and vortex phenomenon of the airflow in the middle of the wind wheel is relatively serious, the noise is large, and the efficiency is affected. Summary of the invention

[0005] The utility model aims to provide a forward centrifugal wind wheel and a forward centrifugal fan with one-way air intake, so as to solve the technical problems in the prior art that the airflow turbulence and eddy current phenomenon in the middle of the forward centrifugal wind wheel are serious, the noise is high and the efficiency is affected.

[0006] The technical solution of the utility model is achieved in this way:

[0007] The utility model provides a forward centrifugal wind wheel, comprising a wheel disc and a plurality of blades, wherein the plurality of blades are circumferentially distributed on the wheel disc, a hub is arranged on the inner side of the wheel disc, an air duct is formed between two adjacent blades, the inner side of the air duct forms an air inlet of the wind wheel, the outer side of the air duct forms an air outlet of the wind wheel, the wheel disc is located in the middle position of the axial ends of the blades, and is characterized in that: the wheel disc is annular, comprising a main board portion inclined on the outer side and an air guide portion located on the inner side, the cross section of the main board portion is inclined upward from the outside to the inside, and the cross section of the air guide portion is an arc-shaped arc bent from the top to the bottom.

[0008] The above-mentioned wheel hub includes a motor connection disk and a plurality of connection bridge arms. A connection hole is provided in the middle of the motor connection disk. One end of each connection bridge arm is connected to the motor connection disk, and the other end of the connection bridge arm is connected to the air guide part.

[0009] The number of the above-mentioned connecting bridge arms is 4, and ventilation holes are formed between adjacent connecting bridge arms.

[0010] The inclination angle G between the main plate portion and the horizontal line is in the range of 3 degrees to 20 degrees.

[0011] The above-mentioned air guide portion is arc-shaped, with a radius R in the range of 3mm-10mm, an arc angle H in the range of 90° to 110°, and a distance P between the end of the air guide portion and the symmetrical midline L in the middle of the wind wheel in the range of 4mm-10mm.

[0012] A forward centrifugal fan with one-way air intake comprises a volute, a motor and a wind wheel, wherein the wind wheel is located inside the volute, an air inlet is formed at the top of the volute, and a downwardly curved arc-shaped air guide ring is formed at the edge of the air inlet. A motor mounting seat is arranged at the bottom of the volute, and the motor is mounted on the motor mounting seat. The upper half of the motor extends into the volute, and the extended end of the motor is inserted into the connecting hole in the middle of the motor connecting plate. The motor is located below the air inlet, and is characterized in that the wind wheel adopts the forward centrifugal wind wheel described above.

[0013] The structures of the arc-shaped air guide ring and the air guide portion are the same.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. The wheel of the utility model is located in the middle of the two ends of the blade axis. The wheel is annular, including a main board portion inclined on the outside and an air guide portion located on the inside. The cross section of the main board portion is inclined upward from the outside to the inside, and the cross section of the air guide portion is an arc bent from the top to the bottom, which can play a good role in guiding the airflow from the upper side to the lower side of the wind wheel, effectively improve the turbulence and vortex formation of the airflow in the middle of the wind wheel, reduce noise, and improve the wind wheel impact efficiency. In addition, the cross section of the main board portion is inclined upward from the outside to the inside, so that the airflow from the upper side to the lower side of the wind wheel can also be better guided, improving airflow obstruction.

[0016] 2. Other advantages of the utility model are described in detail in the embodiment section of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional diagram of a wind wheel according to a first embodiment of the utility model;

[0018] Figure 2 This is a top view of a wind wheel according to a first embodiment of the utility model;

[0019] Figure 3 for Figure 2 AA section view;

[0020] Figure 4 for Figure 2 BB cross-sectional view;

[0021] Figure 5 for Figure 4 A partial enlarged view of part D;

[0022] Figure 6 A three-dimensional diagram of a fan according to a second embodiment of the present utility model from one angle;

[0023] Figure 7 A three-dimensional diagram of the fan of the second embodiment of the utility model from another angle;

[0024] Figure 8 is a top view of the fan of the second embodiment of the utility model;

[0025] Fig. 9 yes Figure 8 CC cross-sectional view. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment 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.

[0027] Embodiment 1:

[0028] like Figures 1 to 5 As shown, this embodiment provides a forward centrifugal wind wheel, including a wheel disc 1 and a plurality of blades 2, wherein the plurality of blades 2 are circumferentially distributed on the wheel disc 1, a hub 3 is arranged on the inner side of the wheel disc 1, an air duct 21 is formed between two adjacent blades 2, the inner side of the air duct 21 forms an air inlet 21a of the wind wheel, and the outer side of the air duct 21 forms an air outlet 21b of the wind wheel, the wheel disc 1 is located in the middle position of the axial ends of the blades 2, and is characterized in that: the wheel disc 1 is annular, including a main board portion 11 inclined on the outer side and an air guide portion 12 located on the inner side, the cross section of the main board portion 11 is inclined upward from the outside to the inside, and the cross section of the air guide portion 12 is an arc-shaped curved from the top to the bottom.

[0029] The hub 3 includes a motor connection disk 31 and a plurality of connection bridge arms 32 . A connection hole 311 is provided in the middle of the motor connection disk 31 . One end of each connection bridge arm 32 is connected to the motor connection disk 31 , and the other end of the connection bridge arm 32 is connected to the air guide portion 12 .

[0030] The inclination angle G between the main plate portion 11 and the horizontal line is in the range of 3 degrees to 20 degrees.

[0031] The above-mentioned air guide portion 12 is arc-shaped, with a radius R in the range of 3mm-10mm, an arc angle H in the range of 90° to 110°, and a distance P between the end of the air guide portion 12 and the symmetrical midline L in the middle of the wind wheel in the range of 4mm-10mm.

[0032] There are five connecting bridge arms 32, and ventilation holes 33 are formed between adjacent connecting bridge arms 32. The area of ​​the ventilation holes 33 is relatively large, which is beneficial to increasing the area of ​​airflow in the middle of the wind wheel and increasing the working capacity of the blades on the lower side of the wheel.

[0033] The utility model wheel disc 1 is located in the middle of the two axial ends of the blade 2. The wheel disc 1 is annular and includes a main board portion 11 located on the outside and inclined and an air guide portion 12 located on the inside. The cross section of the main board portion 1 is inclined upward from the outside to the inside, and the cross section of the air guide portion 12 is an arc bent from the top to the bottom, which can play a good role in guiding the airflow flowing from the upper side to the lower side of the wind wheel, effectively improve the turbulence and vortex formation of the airflow in the middle of the wind wheel, reduce noise, and improve the wind wheel impact efficiency. In addition, the cross section of the main board portion 11 is inclined upward from the outside to the inside, so that the airflow flowing from the upper side to the lower side of the wind wheel can also be better guided, thereby improving airflow obstruction.

[0034] Embodiment 2:

[0035] like Figures 6 to 9 As shown, a forward centrifugal fan with one-way air intake includes a volute 4, a motor 5 and a wind wheel 100. The wind wheel 100 is located inside the volute 4. An air inlet 41 is formed at the top of the volute 4. The edge of the air inlet 41 forms an arc-shaped air guide ring 42 that bends downward. A motor mounting seat 43 is arranged at the bottom of the volute 4. The motor 5 is mounted on the motor mounting seat 43. The upper half of the motor 5 extends into the volute 4. The extended end of the motor 5 is inserted into the connecting hole 311 in the middle of the motor connecting plate 31. The motor 5 is located below the air inlet 41. It is characterized in that the wind wheel 100 adopts the forward centrifugal wind wheel described in Example 1.

[0036] The arc-shaped air guide ring 42 and the air guide portion 12 have the same structure.

[0037] The working principle of the utility model is as follows: the motor rotates at high speed, driving the wind wheel 100 to rotate, sucking air from the air inlet 41 at the top of the volute 4, and when the air flows from the upper side to the lower side, it passes through the ventilation holes 33, and the blades 2 of the wind wheel 100 throw the air radially out. The cross section of the main board part 11 is tilted upward from the outside to the inside, so that the airflow flowing from the upper side to the lower side of the wind wheel can be better guided, and the airflow obstruction can be improved. The cross section of the air guide part 12 is an arc that bends from top to bottom, which can play a good role in guiding the airflow flowing from the upper side to the lower side of the wind wheel, effectively improving the turbulence and vortex formation of the airflow in the middle of the wind wheel, with low noise, and improving the efficiency of the wind wheel.

[0038] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A forward centrifugal wind wheel, comprising a wheel disc (1) and a plurality of blades (2), wherein the plurality of blades (2) are circumferentially distributed on the wheel disc (1), a hub (3) is arranged on the inner side of the wheel disc (1), an air duct (21) is formed between two adjacent blades (2), the inner side of the air duct (21) forms an air inlet (21a) of the wind wheel, and the outer side of the air duct (21) forms an air outlet (21b) of the wind wheel, the wheel disc (1) is located at a middle position between the two axial ends of the blades (2), and is characterized in that The wheel disc (1) is annular and comprises a main plate portion (11) located at an outer side and inclined, and an air guide portion (12) located at an inner side. The cross section of the main plate portion (11) is inclined upward from the outside to the inside, and the cross section of the air guide portion (12) is an arc-shaped arc that bends from the top to the bottom.

2. A forward centrifugal wind wheel according to claim 1, characterized in that: The wheel hub (3) comprises a motor connection disk (31) and a plurality of connection bridge arms (32); a connection hole (311) is provided in the middle of the motor connection disk (31); one end of each connection bridge arm (32) is connected to the motor connection disk (31); and the other end of the connection bridge arm (32) is connected to the air guide portion (12).

3. A forward centrifugal wind wheel according to claim 1 or 2, characterized in that: The number of the connecting bridge arms (32) is five, and ventilation holes (33) are formed between adjacent connecting bridge arms (32).

4. A forward centrifugal wind wheel according to claim 1 or 2, characterized in that: The inclination angle G between the main plate portion (11) and the horizontal line is in the range of 3° to 20°.

5. A forward centrifugal wind wheel according to claim 1 or 2, characterized in that: The wind guide portion (12) is arc-shaped, with a radius R in the range of 3 mm to 10 mm, an arc angle H in the range of 90° to 110°, and a distance P between the end of the wind guide portion (12) and a symmetric center line L in the middle of the wind wheel in the range of 4 mm to 10 mm.

6. A forward centrifugal fan with one-way air intake, comprising a volute (4), a motor (5) and a wind wheel (100), wherein the wind wheel (100) is located inside the volute (4), an air inlet (41) is formed at the top of the volute (4), and an arc-shaped air guide ring (42) is formed at the edge of the air inlet (41) that bends downward, a motor mounting seat (43) is arranged at the bottom of the volute (4), the motor (5) is mounted on the motor mounting seat (43), the upper half of the motor (5) extends into the volute (4), the extended end of the motor (5) is inserted into the connecting hole (311) in the middle of the motor connecting plate (31), and the motor (5) is located below the air inlet (41), characterized in that: The wind wheel (100) is a forward centrifugal wind wheel as described in any one of claims 1 to 5.

7. A forward centrifugal fan with one-way air inlet according to claim 6, characterized in that: The arc-shaped air guide ring (42) and the air guide portion (12) have the same structure.

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