Centrifugal fan volute, centrifugal fan and air conditioner

Abstract

The present invention discloses a volute of a centrifugal fan, a centrifugal fan and an air conditioner, wherein the volute is formed with a first air inlet, a second air inlet, an air outlet and a centrifugal air duct, the centrifugal air duct connects the first air inlet, the second air inlet and the air outlet, the first air inlet and the second air inlet are arranged oppositely at two ends of the volute in the axial direction, the centrifugal air duct is used to accommodate a centrifugal fan wheel, and the volute is provided with a side of the first air inlet for installing a motor, wherein the air inlet area of ​​the first air inlet is larger than that of the second air inlet. In this embodiment, by increasing the area of ​​the first air inlet on the side of the volute provided with the motor, the adverse effect of installing the motor on one air inlet side of the centrifugal fan is reduced, so that the air inlet on the two air inlet sides of the centrifugal fan is more balanced, so that the centrifugal fan can still run smoothly at high speed and reduce wind noise.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a volute of a centrifugal fan, a centrifugal fan and an air conditioner. Background Art

[0002] The volute and the impeller of the existing double-suction centrifugal fan for air conditioning adopt a basically symmetrical structural design, and the motor is installed on one of the two air inlet sides of the double-suction centrifugal fan.

[0003] The air inlet side of the double-suction centrifugal fan is equipped with a motor. Due to the presence of the motor and its mounting structure, the air inlet effects on both sides of the double-suction centrifugal fan are different, which causes the double-suction centrifugal fan to run unsteadily at high speed and cause large airflow noise. Summary of the invention

[0004] The main purpose of the present invention is to provide a volute of a centrifugal fan, a centrifugal fan and an air conditioner, aiming to improve the air intake difference between the two air intake sides of the double-suction centrifugal fan and reduce the airflow noise.

[0005] To achieve the above object, the present invention provides a volute of a centrifugal fan.

[0006] The volute is formed with a first air inlet, a second air inlet, an air outlet and a centrifugal air duct, the centrifugal air duct is connected with the first air inlet, the second air inlet and the air outlet, and the first air inlet and the second air inlet are arranged oppositely at two ends of the volute in the axial direction;

[0007] The centrifugal air duct is used to accommodate the centrifugal wind wheel, and the side of the volute provided with the first air inlet is used to install the motor;

[0008] Wherein, the air inlet area of ​​the first air inlet is larger than that of the second air inlet.

[0009] In one embodiment, the first air inlet and the second air inlet are both circular, and the diameter of the first air inlet is larger than that of the second air inlet.

[0010] To achieve the above object, the present invention further provides a centrifugal fan, comprising:

[0011] a volute as described above;

[0012] a centrifugal fan wheel, arranged in the centrifugal air duct, the centrifugal fan wheel comprising a partition, and centrifugal fan blades arranged on both sides of the partition in a relative manner, a drive mounting portion being arranged on one side of the partition, a side of the partition provided with the drive mounting portion facing the first air inlet, and a side of the partition facing away from the drive mounting portion facing the second air inlet; and,

[0013] The motor is arranged on a side of the volute where the first air inlet is arranged, and the motor is drivingly connected to the driving mounting portion to drive the centrifugal wind wheel to rotate.

[0014] In one embodiment, the centrifugal fan blade is a multi-blade centrifugal fan blade, the inner diameter of the centrifugal fan blade is d1, the outer diameter is d2, the first air inlet and the second air inlet are both circular, the diameter of the first air inlet is D1, the diameter of the second air inlet is D2, D1=d1+λ(d2-d1), D2=d1+b(d2-d1), wherein λ is greater than or equal to 0.4 and less than or equal to 0.6, and b is less than or equal to 0.2.

[0015] In one embodiment, the centrifugal fan blade includes a first blade group and a second blade group, the first blade group is arranged on a side of the partition where the drive mounting portion is arranged, and the second blade group is arranged on a side of the partition facing away from the drive mounting portion;

[0016] The structures of the first blade group and the second blade group related to the air intake volume are arranged differently to reduce the difference in air intake volume between the first blade group and the second blade group.

[0017] In one embodiment, the first blade group includes a plurality of first blades arranged at intervals along the circumference of the centrifugal wind wheel to form a cylindrical first blade group, and the plurality of first blades are arranged around the drive mounting portion;

[0018] The second blade group includes a plurality of second blades arranged at intervals along the circumference of the centrifugal wind wheel to form a cylindrical second blade group;

[0019] The inner diameter of the first blade group is greater than the inner diameter of the second blade group.

[0020] In one embodiment, a width of each of the first blades is smaller than a width of each of the second blades.

[0021] In one embodiment, the installation angle of each of the first blades is greater than the installation angle of each of the second blades.

[0022] In one embodiment, the inner diameter of the first blade group is d1, the inner diameter of the second blade group is d11, the outer diameters of the first blade group and the second blade group are d2, the first air inlet and the second air inlet are both circular, the diameter of the first air inlet is D1, the diameter of the second air inlet is D2, D1=d1+c(d2-d1), D2=d11+c(d2-d11), wherein c is greater than or equal to 0.1 and less than or equal to 0.3.

[0023] To achieve the above object, the present invention further provides an air conditioner, comprising the centrifugal fan as described above.

[0024] In the embodiment provided by the present invention, the volute is formed with a first air inlet, a second air inlet, an air outlet and a centrifugal air duct, the centrifugal air duct connects the first air inlet, the second air inlet and the air outlet, the first air inlet and the second air inlet are arranged at two ends of the volute in the axial direction, the centrifugal air duct is used to accommodate a centrifugal wind wheel, and the volute is provided with a side of the first air inlet for installing a motor, wherein the air inlet area of ​​the first air inlet is larger than that of the second air inlet. Compared with the traditional double-suction centrifugal fan with basically the same air inlets on both sides, the centrifugal fan provided by the present invention reduces the adverse effects of reduced air inlet area and increased wind resistance on one air inlet side of the centrifugal fan due to the installation of the motor by increasing the area of ​​the first air inlet on the side of the volute provided with the motor, and the air inlet volume on the side of the centrifugal fan provided with the motor tends to increase, so that the difference in air inlet volume on the two air inlet sides of the centrifugal fan is reduced, and the air inlet on both sides is more balanced, so that it can still run smoothly at high speed and reduce wind noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a side view of an embodiment of an air conditioner provided by the present invention;

[0026] Figure 2 for Figure 1 Exploded diagram of the air conditioner;

[0027] Figure 3 Figure 1 Schematic diagram of the three-dimensional structure of the centrifugal fan;

[0028] Figure 4 Figure 3 Schematic diagram of the three-dimensional structure of the centrifugal fan;

[0029] Figure 5 for Figure 3 Front view of the motor side of the centrifugal fan;

[0030] Figure 6 for Figure 5 Sectional view at AA in the middle;

[0031] Figure 7 for Figure 6 Sectional view at the middle BB;

[0032] Figure 8 for Figure 3 Front view of the motor side of the middle volute;

[0033] Fig. 9 for Figure 3 A front view of the side of the middle volute opposite to the motor side;

[0034] Fig.10 for Figure 4 A front view of an embodiment of a central centrifugal impeller;

[0035] Fig.11 for Figure 4 A schematic diagram of the three-dimensional structure of another embodiment of a central centrifugal impeller;

[0036] Fig.12 for Fig.11 A cross-sectional view of the first blade group;

[0037] Fig.13 for Fig.11 A cross-sectional view of the second blade group;

[0038] Fig.14 for Figure 4 A schematic diagram of the three-dimensional structure of another embodiment of a central centrifugal wind wheel;

[0039] Fig.15 for Fig.14 A cross-sectional view of the first blade group;

[0040] Fig.16 for Fig.14 A cross-sectional view of the second blade group;

[0041] Fig.17 A comparison chart of air volume-noise data between the centrifugal fan provided by the present invention and the existing centrifugal fan;

[0042] Fig.18 A λ-air volume curve diagram of an embodiment of a centrifugal fan provided by the present invention;

[0043] Fig.19 A comparison diagram of the air volume flow field of the centrifugal fan provided by the present invention under different values ​​of λ.

[0044] Description of Figure Numbers:

[0045] Label name Label name 100 Centrifugal fans 30 Motor 10 Centrifugal wind wheel 31 Motor seat 11 The first blade group 32 Motor shaft 110 First blade 40 Motor mounting parts 12 Second blade group 41 Connecting plate 120 Second blade 42 Connecting ribs 13 Partition 200 Air Conditioner 131 Driver installation department 201 shell 20 Snail 202 Heat exchange air inlet 21 First air inlet 203 Heat exchange outlet 22 Second air inlet 204 Heat Exchanger 23 Air outlet

[0046] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. If they exist, they are not within the scope of protection required by the present invention.

[0050] The present invention provides an air conditioner 200. The air conditioner 200 can be an integrated air conditioner, a split air conditioner, an air conditioner outdoor unit, a cabinet air conditioner indoor unit, an embedded air conditioner indoor unit, or a wall-mounted air conditioner indoor unit, or any other air conditioner 100 that can use a double-suction centrifugal fan wheel. Figure 1 and Figure 2 In the present embodiment, the air conditioner 200 is a cabinet-type air conditioner indoor unit.

[0051] The volute and impeller of the existing double-suction centrifugal fan adopt a basically symmetrical structural design, and the motor is installed on one of the two air inlet sides of the double-suction centrifugal fan. The centrifugal impeller in the double-suction centrifugal fan rotates under the drive of the motor, and the two air inlets on both sides of the volute suck the air flow into the centrifugal air duct and send it out from the air outlet. The motor of the double-suction centrifugal fan is usually installed on one of the two air inlet sides of the volute, resulting in a reduction in the air inlet area and an increase in wind resistance on the air inlet side, and the air intake volume is significantly reduced compared to the other air inlet side. The air intake difference and air intake wind speed difference on the two air inlet sides of the double-suction centrifugal fan are large, resulting in unbalanced air intake on the two air inlet sides when the centrifugal impeller of the double-suction centrifugal fan runs at high speed, resulting in unstable operation of the centrifugal fan, large wind noise, and the air supply volume is also affected and reduced.

[0052] To solve the above technical problems, please refer to Figures 3 to 9 The present invention provides a volute 20 of a centrifugal fan 100 and a centrifugal fan 100 including the centrifugal fan wheel 10.

[0053] See also Figure 3 and Figure 4In this embodiment, the centrifugal fan 100 includes a volute 20, a centrifugal fan wheel 10 and a motor 30. The volute 20 is formed with a first air inlet 21, a second air inlet 22, an air outlet 23 and a centrifugal air duct. The centrifugal air duct connects the first air inlet 21, the second air inlet 22 and the air outlet 23. The first air inlet 21 and the second air inlet 22 are arranged at opposite ends of the volute 20 in the axial direction. The centrifugal fan wheel 10 is arranged in the centrifugal air duct. The motor 30 is arranged on one side of the volute 20 where the first air inlet 21 is arranged, so as to drive the centrifugal fan wheel 10 to rotate. When the centrifugal fan wheel 10 rotates, the airflow is sucked into the centrifugal air duct from the first air inlet 21 and the second air inlet 22, and the airflow is sent out from the air outlet 23.

[0054] The centrifugal fan 100 in this embodiment is a double-suction centrifugal fan. Compared with ordinary centrifugal fans that generally only inhale air from one side, the double-suction centrifugal fan inhales air from both sides at the same time, which increases the air intake area and thus has a larger air volume than ordinary centrifugal fans. However, as shown in this embodiment, the centrifugal fan 100 needs to install a motor 30 on one side of the volute 20 (in the present invention, the side of the centrifugal fan 100 on which the motor 30 is installed is called the motor side), resulting in the air intake of the first air inlet 21 on the motor side of the centrifugal fan 100 being blocked by the motor 30, and the air intake air volume and wind resistance of the second air inlet 22 on the other side are greater, and the air intake area is reduced, resulting in a large difference in the air intake between the first air inlet 21 and the second air inlet 22, and the air intake on both sides of the centrifugal fan 100 is unbalanced.

[0055] To this end, in this embodiment, see Figures 5 to 8 The volute 20 of the centrifugal fan 100 is formed with a first air inlet 21, a second air inlet 22, an air outlet 23 and a centrifugal air duct. The centrifugal air duct connects the first air inlet 21, the second air inlet 22 and the air outlet 23. The first air inlet 21 and the second air inlet 22 are arranged at opposite ends of the volute 20 in the axial direction. The centrifugal air duct is used to accommodate the centrifugal wind wheel 10. The side of the volute 20 provided with the first air inlet 21 is used to install the motor 30. In addition, in this embodiment, the air inlet area of ​​the first air inlet 21 is larger than that of the second air inlet 22.

[0056] It should be noted that in the present invention, the air inlet area of ​​the first air inlet 21 or the second air inlet 22 only considers the shape and size of the first air inlet 21 and the second air inlet 22 on the volute 20. The influence of the shielding of the motor 30 or the structure of the internal centrifugal impeller 10 on the actual air inlet volume of the first air inlet 21 and the second air inlet 22 is not considered. Through the design of the volute 20 in this embodiment, the centrifugal fan 100 in this embodiment is compared with the traditional double-suction centrifugal fan with basically the same air inlets on both sides. By increasing the area of ​​the first air inlet 21 on the side of the volute 20 with the motor 30, the adverse effects such as the reduction of the air inlet area and the increase of the wind resistance on one air inlet side of the centrifugal fan 100 due to the installation of the motor 30 are reduced, and the air inlet volume on the side of the centrifugal fan 100 with the motor 30 has a tendency to increase, so that the difference in the air inlet volume on the two air inlet sides of the centrifugal fan is reduced, and the air inlet on both sides is more balanced, so that it can still run smoothly at high speed and reduce wind noise.

[0057] The specific shapes of the first air inlet 21 and the second air inlet 22 are not limited as long as the air flow can be sucked into the centrifugal air duct. Figure 8 and Fig. 9 In order to reduce wind resistance, the first air inlet 21 and the second air inlet 22 are both circular, the diameter of the first air inlet 21 is D1, the diameter of the second air inlet 22 is D2, and D1 is greater than D2. Thus, in this embodiment, the area of ​​the first air inlet 21 is greater than the second air inlet 22, and thus has a larger air inlet area than the second air inlet 22. As a result, when the centrifugal fan 100 is working, the air intake volume of the first air inlet 21 tends to increase. In this way, the adverse effects of the reduced air intake area and increased wind resistance on one air inlet side of the centrifugal fan 100 due to the installation of the motor 30 are reduced, so that the difference in air intake volume on the two air inlet sides of the centrifugal fan is reduced, and the air intake on both sides is more balanced, so that the centrifugal fan can still run smoothly at high speed and reduce wind noise.

[0058] The structure and size of the centrifugal fan wheel 10 are not limited, as long as the centrifugal fan wheel 10 is applicable to the double-suction centrifugal fan 10 and can suck air from both sides at the same time. Figures 5 to 7 The centrifugal wind wheel 10 includes a partition 13 and centrifugal fan blades arranged on both sides of the partition 13. A driving mounting portion 131 is provided on one side of the partition 13. The driving mounting portion 131 is used to cooperate with the motor 30 in transmission, so that the motor 30 drives the centrifugal wind wheel 10 to rotate.

[0059] It should be noted that, in the present embodiment, the partition 13 mainly plays a role in cooperating with the motor 30, and the driving connection between the motor 30 and the centrifugal wind wheel 10 is realized through the driving mounting portion 131 provided on the partition 13. The rotation of the rotating shaft of the motor 30 can be transmitted to the centrifugal wind wheel 10, thereby driving the centrifugal wind wheel 10 to rotate, generating centrifugal force, driving the airflow to be sucked into the centrifugal air duct from the first air inlet 21 and the second air inlet 22, and then sent out from the air outlet 23. In addition, the partition 13 can also play a role in blocking the airflow. It can be understood that in the present embodiment, the first air inlet 21 and the second air inlet 22 are sucked into the centrifugal air duct from two opposite directions in the axial direction of the centrifugal wind wheel 10, that is, the inlet airflow directions of the first air inlet 21 and the second air inlet 22 are opposite. If there is no partition 13 to block it, it is easy for the two inlet airflows to collide and offset each other, resulting in a reduction in the air supply volume of the centrifugal fan 100. Therefore, in this embodiment, the partition 13 plays a role in blocking the airflow, so that the airflow entering the centrifugal air duct from the first air inlet 21 is blocked by the partition 13 and transported to the air outlet 23 under the centrifugal action of the centrifugal fan blades, and the airflow entering the centrifugal air duct from the second air inlet 22 is blocked by the partition 13 and transported to the air outlet 23 under the centrifugal action of the centrifugal fan blades. For this reason, the partition 13 is preferably a circular plate-shaped structure matching the centrifugal air duct, and it is best not to have a hollow structure as a whole to avoid cross-flow.

[0060] In this embodiment, the side of the partition 13 provided with the drive mounting portion 131 faces the first air inlet 21, and the side of the partition 13 facing away from the drive mounting portion 131 faces the second air inlet. The specific structure of the drive mounting portion 131 is not limited, for example, it can be a transmission shaft, shaft hole or other structure connected to the motor 30. In this embodiment, please refer to Figure 6 The motor 30 mounting portion is a motor 30 mounting shaft hole formed in the center of the partition 13, which is used to be connected to the motor shaft 32 of the motor 30, so that the partition 13 rotates under the action of the motor 30, and drives the centrifugal fan blades on both sides of the partition 13 to rotate accordingly, generating centrifugal force to drive the airflow to flow along the air delivery direction of the centrifugal air duct.

[0061] In one embodiment, see Fig.10 The centrifugal fan blades of the centrifugal fan wheel 10 are multi-blade centrifugal fan blades, and the centrifugal fan blades on both sides of the partition have substantially the same inner diameter and outer diameter. Specifically, the inner diameter of the centrifugal fan blade is d1, the outer diameter of the centrifugal fan blade is d2, the first air inlet 21 and the second air inlet 22 are both circular, the diameter of the first air inlet 21 is D1, the diameter of the second air inlet 22 is D2, and the values ​​of D1 and D2 are as follows: D1 = d1 + λ (d2-d1), D2 = d1 + b (d2-d1).

[0062] In the prior art, the value range of λ and b is about 0.2, that is, D1 and D2 are substantially the same or close, and thus the air inlet areas of the first air inlet 21 and the second air inlet 22 are substantially the same. This results in uneven air inlet on both sides of the centrifugal fan 100 and high wind noise. In this embodiment, the value of λ is greater than b, so that D1 is greater than D2, that is, the diameter of the first air inlet 21 is greater than the second air inlet 22, and the air inlet area of ​​the first air inlet 21 is therefore greater than the second air inlet 22.

[0063] In the present embodiment, b is less than or equal to 0.2, and preferably b is equal to 0.2. It can be understood that the larger the value of λ is, the larger the air inlet area of ​​the first air inlet 21 is than the second air inlet 22, and the more conducive it is for the actual air intake volume of the first air inlet 21 to be close to the second air inlet 22. If the value of λ is too small, it is impossible to significantly increase the air inlet area of ​​the first air inlet 21 to achieve the purpose of balancing the air intake volume on both sides of the centrifugal fan 100. However, if the value of λ is too large, it may also cause the adverse effects of a sudden decrease in air volume and an increase in noise. To this end, taking into account the degree to which the first air inlet 21 is blocked by the installation of the motor 30, as well as factors such as reducing noise and increasing the air output of the centrifugal fan 100, the value of λ can be appropriately increased to increase the diameter of the first air inlet 21.

[0064] Specifically, according to the wind flow field simulation experiment, we can get the following Fig.18 As shown in the λ-air volume curve, it can be seen that when the value of λ is in the range of 0.1 to 0.4, the air volume of the centrifugal fan 100 does not change much, when the value of λ is in the range of 0.4 to 0.6, the air volume of the centrifugal fan 100 increases, and when the value of λ is greater than 0.6, the air volume of the centrifugal fan 100 decreases significantly. Fig.19 , Fig.19 The following figure shows the comparison of air volume flow field under different values ​​of λ. Fig.19 In the left figure, the value of λ is 0.1, the value of λ in the middle figure is 0.5, and the value of λ in the right figure is 0.8. It can be seen from the figure that when the value of λ is 0.5, the distribution effect of the air volume flow field is the best and the air volume is the largest. Therefore, in this embodiment, λ is greater than or equal to 0.4 and less than or equal to 0.6.

[0065] In one embodiment, see Figures 11 to 16 The centrifugal fan blades include a first blade group 11 and a second blade group 12. The first blade group 11 is arranged on a side of the partition 13 where the drive mounting portion 131 is arranged, and the second blade group 12 is arranged on a side of the partition 13 that is away from the drive mounting portion 131. The structures related to the air intake of the first blade group 11 and the second blade group 12 are arranged differently to reduce the difference in air intake between the first blade group 11 and the second blade group 12 due to the influence of the motor 30.

[0066] The specific forms of the first blade set 11 and the second blade set 12 are also not limited, for example, they can be a multi-blade centrifugal wind wheel or a wind wheel centrifugal wind wheel. Fig.11 The structures related to the air intake volume of the first blade group 11 and the second blade group 12 are differentially arranged to reduce the difference in air intake volume between the first blade group 11 and the second blade group 12 due to the influence of the motor 30 .

[0067] In this embodiment, the specific implementation method of the differentiated structural arrangement of the first blade group 11 and the second blade group 12 is not limited, as long as it can reduce the adverse effects of reduced air intake area and increased wind resistance on one air intake side of the centrifugal fan 100 due to the installation of the motor 30. In this embodiment, through the differentiated structural design of the first blade group 11 and the second blade group 12 of the centrifugal fan wheel 10, the air intake volume corresponding to the first blade group 11 can be increased, so that the difference in air intake volume on the two air intake sides of the centrifugal fan 100 is reduced, and the air intake on both sides is more balanced, so that it can still run smoothly at high speed and reduce wind noise.

[0068] In this example, please continue to refer to Figures 11 to 16 The centrifugal wind wheel 10 is a multi-blade centrifugal wind wheel. Specifically, the first blade group 11 includes a plurality of first blades 110 arranged at intervals along the circumference of the centrifugal wind wheel 10 to form a cylindrical first blade group 11, and the plurality of first blades 110 are arranged around the drive mounting portion 131. Thus, in this embodiment, please refer to Figure 6 , the motor 30 can be at least partially installed in the hollow space of the first blade group 11, so as to reduce the overall volume of the centrifugal fan 100. The second blade group 12 includes a plurality of second blades 120 arranged at intervals along the circumference of the centrifugal wind wheel 10 to form a cylindrical second blade group 12. The extension direction of each first blade 110 and each second blade 120 extends along the axial direction of the centrifugal wind wheel 10. It can be understood that the first blade group 11 and the second blade group 12 should have similar or even substantially the same outer diameter to be suitable for the basic structure of the centrifugal air duct and ensure the air supply effect of the centrifugal fan 100. In this embodiment, the outer diameters of the first blade group 11 and the second blade group 12 are both d2, and at the same time, the inner diameter d1 of the first blade group 11 is greater than the inner diameter d11 of the second blade group 12, that is, the maximum inner diameter of the first blade group 11 in the radial direction is greater than the maximum inner diameter of the second blade group 12 in the radial direction.

[0069] Thus, in this embodiment, the first blade group 11 has a larger air intake area than the second blade group 12, thereby compensating for the adverse effect of the motor 30 installed on the motor 30 side of the centrifugal fan 100 on the air intake of the first blade group 11. Figure 7In the first blade group 11, if the first blade group 11 and the second blade group 12 have the same inner diameter, then the air intake volume corresponding to the first blade group 11 will be much smaller than that of the second blade group 12. In the present embodiment, since the inner diameter of the first blade group 11 is relatively increased, the distance L between the inner diameter of the first blade group 11 and the motor base 31 of the motor 30 tends to increase, so that there is a larger air intake area around the motor base 31, so that the air intake volume of the first blade group 11 tends to increase, reaching the same as the air intake volume of the second blade group 12, or close to it, or although the air intake volume is smaller than that of the second blade group 12, at least the air intake difference with the second blade group 12 is reduced. Thus, in this embodiment, the design in which the first blade group 11 has a larger inner diameter than the second blade group 12 can increase the air intake volume corresponding to the first blade group 11 and reduce the air intake difference between the first blade group 11 and the second blade group 12 due to the installation of the motor 30, so that the air intake volume difference on the two air intake sides of the centrifugal fan 100 is reduced, and the air intake on both sides is more balanced, so that it can still run smoothly at high speed and reduce wind noise.

[0070] There are many ways to achieve that the inner diameter of the first blade set 11 is larger than the inner diameter of the second blade set 12. Figures 11 to 13 , and the width of each first blade 110 is smaller than the width of each second blade 120. In this embodiment, the width of each blade specifically refers to the width value from the outermost peripheral side to the innermost peripheral side of each blade in the radial direction. Fig.12 As shown, the width of each of the first blades 110 of the first blade group 11 is h1. Fig.13 As shown, the width of each of the first blades 110 of the second blade group 12 is h2, and h1 is greater than h2, so that the inner diameter d1 of the first blade group 11 is greater than the inner diameter d11 of the second blade group 12. In this embodiment, the first blade 110 and the second blade 120 preferably have the same or similar installation angles, and the inner diameter d1 of the first blade group 11 is greater than the inner diameter d11 of the second blade group 12 only by adjusting the blade profile and width of the first blade 110 and the second blade 120. Of course, the first blade group 11 and the second blade group 12 may also have different installation angles and different blade widths, so that the inner diameter d1 of the first blade group 11 is greater than the inner diameter d11 of the second blade group 12.

[0071] Thus, in this embodiment, the design that the first blade group 11 has a larger inner diameter than the second blade group 12 can increase the air intake corresponding to the first blade group 11, reduce the air intake difference between the first blade group 11 and the second blade group 12 due to the installation of the motor 30, so that the air intake difference between the two air intake sides of the centrifugal fan 100 is reduced, and the air intake on both sides is more balanced, so that the centrifugal fan 100 can still run smoothly at high speed and reduce wind noise. It is best that the first blade 110 and the second blade 120 are installed at the same angle to reduce the difficulty of assembly.

[0072] In another embodiment, see Figures 14 to 16 , the installation angle of each first blade 110 is greater than the installation angle of each second blade 120. In this embodiment, please refer to Fig.15 and Fig.16 The installation angle of the blade specifically refers to the angle between the tangent line of the curved inner edge of each blade and the tangent line of the outer periphery of the blade group on the cross section of the cylindrical blade group. Fig.15 As shown, the installation angle of each first blade 110 is a1. Fig.16 The installation angle of each of the second blades 120 is shown as a2, and a1>a2 so that the inner diameter d1 of the first blade group 11 is larger than the inner diameter d11 of the second blade group 12. In this embodiment, the first blade 110 and the second blade 120 preferably have the same or similar blade profiles, and the inner diameter d1 of the first blade group 11 is larger than the inner diameter d11 of the second blade group 12 only by adjusting the blade installation angles of the first blade 110 and the second blade 120. Of course, the first blade group 11 and the second blade group 12 may also have different blade profiles and different installation angles, so that the inner diameter d1 of the first blade group 11 is larger than the inner diameter d11 of the second blade group 12.

[0073] Thus, in this embodiment, the design that the first blade group 11 has a larger inner diameter than the second blade group 12 can increase the air intake corresponding to the first blade group 11, reduce the air intake difference between the first blade group 11 and the second blade group 12 due to the installation of the motor 30, so that the air intake difference between the two air intake sides of the centrifugal fan 100 is reduced, and the air intake on both sides is more balanced, so that the centrifugal fan 100 can still run smoothly at high speed and reduce wind noise. It is best that the first blade 110 and the second blade 120 have the same blade shape to reduce manufacturing costs.

[0074] Based on the above embodiment, the inner diameter of the first blade group is d1, the inner diameter of the second blade group is d11, the outer diameter of the first blade group and the second blade group is d2, the first air inlet 21 and the second air inlet 22 are both circular, the diameter of the first air inlet 21 is D1, the diameter of the second air inlet 22 is D2, D1=d1+c(d2-d1), D2=d11+c(d2-d11), wherein c is greater than or equal to 0.1 and less than or equal to 0.3, and preferably c is equal to 0.2.

[0075] In the present embodiment, since d1 is greater than d11, the diameter D1 of the first air inlet 21 is greater than the diameter D2 of the second air inlet 22, and the air inlet area of ​​the first air inlet 21 is greater than the second air inlet 22. Therefore, compared with the conventional double-suction centrifugal fan with basically the same air inlets on both sides, the centrifugal fan 100 in the present embodiment increases the area of ​​the first air inlet 21 on the side of the volute 20 with the motor 30, thereby reducing the adverse effects of reduced air inlet area and increased wind resistance on one air inlet side of the centrifugal fan 100 due to the installation of the motor 30. The air intake on the side of the centrifugal fan 100 with the motor 30 tends to increase, thereby reducing the difference in air intake volume on the two air inlet sides of the centrifugal fan, and making the air intake on both sides more balanced, so that it can still run smoothly at high speed and reduce wind noise.

[0076] The following is a comparison with the prior art to illustrate the technical effect of the volute 20 provided in this embodiment applied to the centrifugal fan 100. In the prior art, the air inlet areas of the air inlets on both sides of the double-suction centrifugal fan are basically the same, while on the centrifugal fan 100 in this embodiment, the air inlet area of ​​the first air inlet 21 is larger than that of the second air inlet.

[0077] See also Fig.17 , Fig.17 The following is a schematic diagram showing the air volume-noise data comparison between the centrifugal fan 100 provided by the present invention and the existing centrifugal fan. Fig.17 The middle volute 1 is the volute of the centrifugal fan 100 in this embodiment, and the volute 2 is the volute in the prior art. In the figure, the horizontal axis represents the working air volume (m3 / h) of the centrifugal fan 100 using the volute 1, and the vertical axis represents the noise level (dB) generated when the centrifugal fan 100 corresponds to different working air volumes. It can be seen from the figure that, whether it is the volute 1 or the volute 2, the noise of the centrifugal fan 100 during operation increases with the increase of the air volume. And in the case of low air volume, that is, the air volume is less than 1160m3 / h, the noise of the volute 1 is greater than that of the volute 2, but as the air volume increases, the noise difference between the two gradually narrows. In the case of high air volume, that is, the air volume is greater than or equal to 1160m3 / h, the noise of the volute 1 is less than that of the volute 2, and as the wind wheel increases, the noise difference between the two gradually increases. As Fig.17 As shown, when the working air volume of the centrifugal fan 100 is 1200m3 / h, the noise value of the volute 1 is 0.5dB lower than that of the volute 2. That is to say, the slope of the noise increase of the volute 1 with the increase of the air volume is smaller than the slope of the noise increase of the volute 2 with the increase of the air volume. In the air conditioner 200 using the double-suction centrifugal fan 100, its normal working air volume is usually greater than 1200m3 / h, that is to say, the air conditioner 200 using the centrifugal fan 100 provided in this embodiment has a smaller working noise when the air volume is the same, which can bring a more comfortable use experience to the user.

[0078] Based on the above embodiment, it can be understood that the purpose of reducing the adverse effect of the installation of the motor 30 on the air intake of the centrifugal fan 100 can be achieved by improving the installation structure of the motor 30. To this end, in this embodiment, please refer to Figures 3 to 5 The centrifugal fan 100 further includes a motor mounting member 40. The motor 30 is disposed in the volute 20 and is at least partially located in the centrifugal air duct between the first air inlet 21 and the partition 13. The motor 30 includes a motor seat 31 and a motor shaft 32. The motor seat 31 is mounted on the volute 20 through the motor mounting member 40 and is spaced apart from the volute 20. The motor shaft 32 extends from the motor seat 31 to the partition 13 and is drivingly connected to the driving mounting portion 131.

[0079] In this embodiment, the motor 30 is basically contained in the air inlet duct corresponding to the first blade group 11, that is, basically contained in the volute 20, thereby reducing the overall volume of the centrifugal fan 100, making the centrifugal fan 100 compact and easy to install. At the same time, the motor seat 31 is connected and installed with the volute 20 through the motor mounting member 40, and the motor seat 31 and the volute 20 are spaced apart, so that there is a gap between the motor seat 31 and the inner wall of the first air inlet 21, and the air intake airflow flows into the centrifugal air duct from the gap between the motor seat 31 and the inner wall of the first air inlet 21. It is best that the motor seat 31 is correspondingly arranged at the center position of the first air inlet 21, so that the airflow from the first air inlet 21 to the middle of the first blade group 11 is more balanced, and the air intake is smooth, which is conducive to reducing wind resistance and increasing the air intake corresponding to the first blade group 11. Combined with the design that the inner diameter of the first blade group 11 is larger than the inner diameter of the second blade group 12, the air intake corresponding to the first blade group 11 can be increased, and the air intake difference between the first blade group 11 and the second blade group 12 caused by the installation of the motor 30 can be reduced, so that the difference in air intake on the two air intake sides of the centrifugal fan 100 is reduced, and the air intake on both sides is more balanced, so that it can still run smoothly at high speed and reduce wind noise. It is best that the first blade 110 and the second blade 120 are installed at the same angle to reduce the difficulty of assembly.

[0080] On the basis of the previous embodiment, in order to more stably install the motor 30, a plurality of motor mounting members 40 are provided, and the plurality of motor mounting members 40 are spaced apart along the circumference of the first air inlet 21, and each motor mounting member 40 extends radially along the first air inlet 21, and one end is connected to the volute 20, and the other end is connected to the motor seat 31. In this way, the motor seat 31 is supported from multiple directions, so that the force on the motor seat 31 is reasonable. In addition, each mounting member is designed to be narrow and long, so that the mounting member occupies a small area in the air inlet direction, reduces the occupation of the air inlet area, and increases the air inlet volume.

[0081] The specific structure of each motor mounting member 40 is not limited, as long as the motor 30 can be reliably fixed so that the motor 30 is stably mounted on the volute 20. Figures 3 to 5, each motor mounting member 40 includes a connecting plate 41 connected to the motor seat 31, and a plurality of connecting ribs 42 extending from the connecting plate 41 to the volute 20, and there is a gap between each two adjacent connecting ribs 42. In this embodiment, the motor mounting member 40 has a hollow structure, so that the air flow can flow into the centrifugal air duct from the gap formed between the plurality of connecting ribs 42 in the motor mounting member 40, further reducing the shielding of the mounting member on the air flow, increasing the air flow of the first air inlet 21, and the method of fixing the motor seat 31 by the connecting plate 41 is also easy to assemble. Preferably, as Figure 3 As shown, the axial dimension of each connecting rib 42 is larger than the radial dimension, that is, the windward surface of each connecting rib 42 has a smaller dimension, and has a larger dimension in the airflow conveying direction. In this way, while ensuring the rigidity of the connecting rib 42 and the strength of the motor mounting part 40, the obstruction of the motor mounting part 40 to the airflow is reduced, thereby increasing the air intake volume.

[0082] See also Figure 1 to Figure 2 The centrifugal fan 100 and the centrifugal fan wheel 10 provided in this embodiment are applied to an air conditioner 200, and the air conditioner 200 is a cabinet-type air conditioner indoor unit. In this embodiment, the air conditioner 200 includes a housing 201, a heat exchanger 204 and a centrifugal fan 100. Please continue to refer to Figure 2 The outer shell 201 may include a chassis arranged at the lower end of the air conditioner 200, a bottom shell extending upward from the chassis, and a panel arranged at the front side of the bottom shell. A heat exchange air duct formed by the chassis, the bottom shell and the panel is formed in the outer shell 201. Two heat exchange air inlets 202 are provided at the lower end of the outer shell 201, and a heat exchange air outlet 203 is provided at the upper end of the outer shell 201. The heat exchange air duct connects the two heat exchange air inlets 202 and the heat exchange air outlet 203. The two heat exchange air inlets 202 are both provided on the bottom shell, and are provided on two sides of the bottom shell that are arranged oppositely, the heat exchanger 204 is provided in the heat exchange air duct, the centrifugal fan 100 is provided in the heat exchange air duct, and the first air inlet 21 on the volute 20 of the centrifugal fan 100 corresponds to one of the two heat exchange air inlets 202, the second air inlet 22 on the volute 20 of the centrifugal fan 100 corresponds to the other of the two heat exchange air inlets 202, and the air outlet 23 corresponds to the heat exchange air outlet 203. Driven by the centrifugal fan 100, the indoor air flows into the heat exchange air duct from the two heat exchange air inlets 202, exchanges heat through the heat exchanger 204 in the heat exchange air duct, and obtains heat-exchanged air, which is sent out from the heat exchange air outlet 203, so that the air conditioner 200 can adjust the indoor temperature.

[0083] In this embodiment, the air conditioner 200 uses the double suction centrifugal fan 100 provided in the above embodiment, and the volute 20 provided in this embodiment is used in the double suction centrifugal fan 100. In this embodiment, through the design of the volute 20 in this embodiment, the centrifugal fan 100 provided by the present invention is compared with the conventional double suction centrifugal fan with basically the same air inlets on both sides, by increasing the area of ​​the first air inlet 21 on the side of the volute 20 provided with the motor 30, reducing the adverse effects such as the reduction of the air inlet area and the increase of the wind resistance on one air inlet side of the centrifugal fan 100 due to the installation of the motor 30, and the air intake on the side of the centrifugal fan 100 provided with the motor 30 has an increasing trend, so that the difference in the air intake volume on the two air inlet sides of the centrifugal fan is reduced, and the air intake on both sides is more balanced, so that it still runs smoothly at high speed (when the air volume of the air conditioner 200 is greater than 1200m3 / h), and the wind noise is reduced.

[0084] Thus, the air conditioner 200 in this embodiment has lower working noise under the same air supply volume compared to the air conditioner 200 using the traditional centrifugal fan 100, which can improve the user experience. Moreover, under the same rotation speed of the centrifugal fan wheel 10, it has a larger air supply volume, which can improve the heat exchange efficiency and cool or heat the room faster.

[0085] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A centrifugal fan, characterized in that: It includes a volute, a centrifugal fan wheel and a motor, wherein the volute is formed with a first air inlet, a second air inlet, an air outlet and a centrifugal air duct, wherein the centrifugal air duct is connected with the first air inlet, the second air inlet and the air outlet, and the first air inlet and the second air inlet are arranged oppositely at two ends of the volute in the axial direction; The centrifugal air duct is used to accommodate the centrifugal wind wheel, and the side of the volute provided with the first air inlet is used to install the motor; Wherein, the air inlet area of ​​the first air inlet is larger than that of the second air inlet; The centrifugal fan wheel is arranged in the centrifugal air duct, and the centrifugal fan wheel includes a partition plate and centrifugal fan blades arranged on both sides of the partition plate in a relative manner, a drive mounting portion is arranged on one side of the partition plate, a side of the partition plate provided with the drive mounting portion faces the first air inlet, and a side of the partition plate facing away from the drive mounting portion faces the second air inlet; The motor is arranged on a side of the volute where the first air inlet is arranged, and the motor is drivingly connected to the driving mounting portion to drive the centrifugal wind wheel to rotate; The motor is key-connected to the drive mounting portion; The centrifugal fan blade is a multi-blade centrifugal fan blade, the inner diameter of the centrifugal fan blade is d1, the outer diameter is d2, the first air inlet and the second air inlet are both circular, the diameter of the first air inlet is D1, the diameter of the second air inlet is D2, D1=d1+λ(d2-d1), D2=d1+b(d2-d1), wherein λ is greater than or equal to 0.4 and less than or equal to 0.6, and b is less than or equal to 0.

2.

2. A centrifugal fan, characterized in that: It includes a volute, a centrifugal fan wheel and a motor, wherein the volute is formed with a first air inlet, a second air inlet, an air outlet and a centrifugal air duct, wherein the centrifugal air duct is connected with the first air inlet, the second air inlet and the air outlet, and the first air inlet and the second air inlet are arranged oppositely at two ends of the volute in the axial direction; The centrifugal air duct is used to accommodate the centrifugal wind wheel, and the side of the volute provided with the first air inlet is used to install the motor; Wherein, the air inlet area of ​​the first air inlet is larger than that of the second air inlet; The centrifugal fan wheel is arranged in the centrifugal air duct, and the centrifugal fan wheel includes a partition plate and centrifugal fan blades arranged on both sides of the partition plate in a relative manner, a drive mounting portion is arranged on one side of the partition plate, a side of the partition plate provided with the drive mounting portion faces the first air inlet, and a side of the partition plate facing away from the drive mounting portion faces the second air inlet; The motor is arranged on a side of the volute where the first air inlet is arranged, and the motor is drivingly connected to the driving mounting portion to drive the centrifugal wind wheel to rotate; The motor is key-connected to the drive mounting portion; The centrifugal fan blades include a first blade group and a second blade group, the first blade group is arranged on a side of the partition plate where the drive mounting portion is arranged, and the second blade group is arranged on a side of the partition plate facing away from the drive mounting portion; The structures of the first blade group and the second blade group related to the air intake volume are arranged differently to reduce the difference in the air intake volume between the first blade group and the second blade group; The first blade group includes a plurality of first blades arranged at intervals along the circumference of the centrifugal wind wheel to form a cylindrical first blade group, and the plurality of first blades are arranged around the drive mounting portion; The second blade group includes a plurality of second blades arranged at intervals along the circumference of the centrifugal wind wheel to form a cylindrical second blade group; The inner diameter of the first blade group is greater than the inner diameter of the second blade group; The inner diameter of the first blade group is d1, the inner diameter of the second blade group is d11, the outer diameters of the first blade group and the second blade group are d2, the first air inlet and the second air inlet are both circular, the diameter of the first air inlet is D1, the diameter of the second air inlet is D2, D1=d1+c(d2-d1), D2=d11+c(d2-d11), wherein c is greater than or equal to 0.1 and less than or equal to 0.

3.

3. The centrifugal fan according to claim 2, characterized in that: The width of each of the first blades is smaller than the width of each of the second blades.

4. The centrifugal fan according to claim 2, characterized in that: The installation angle of each of the first blades is greater than the installation angle of each of the second blades.

5. An air conditioner, characterized in that: It comprises the centrifugal fan as claimed in any one of claims 1 to 4.

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