Air humidifier and centrifugal fan thereof

Abstract

The utility model discloses an air humidifier and centrifugal fan thereof, including the wheel disc and the fixed ring that present upper, lower interval arrangement and a plurality of blades connected between the wheel disc and the fixed ring, the inner hole of fixed ring forms the air intake for sucking the wind, and the outer periphery of wheel disc and fixed ring forms the hollow annular window in common, and the tail edge end of adjacent blade projects in annular window respectively and forms the air outlet for the air outlet in common, and a plurality of blades present interval and spiral around the rotation axis of wheel disc, and the side of blade towards air intake forms the air inlet face, and the air inlet face has the blade edge portion that projects outward and extends, and the one end of blade edge portion is thin near the wheel disc, and its other end is thick near the fixed ring, so can effectively reduce the structural resistance to airflow to reduce the impact intensity to blade to reduce the noise.

Description

Technical Field

[0001] This utility model relates to the field of humidifier technology, and in particular to an air humidifier and its centrifugal impeller. Background Technology

[0002] An air humidifier is a household appliance that increases indoor humidity. It usually contains absorbent paper, which draws water from the tank and sprays it onto the absorbent paper to moisten it. Then, under the centrifugal force of the centrifugal impeller, a continuous airflow is formed, which continuously penetrates the absorbent paper to evaporate and carry away the moisture it contains, eventually entering the room to humidify the air. However, most centrifugal impeller blades have a large structural resistance to the airflow. Therefore, the airflow will have a large impact on the blade surface, resulting in a lot of noise at the air intake. Utility Model Content

[0003] To address the aforementioned problems, this invention provides an air humidifier and its centrifugal impeller. By utilizing the cutting edge on the air inlet surface of the blades, the structural resistance to airflow can be effectively reduced, thereby decreasing the impact intensity on the blades and thus reducing noise.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] This utility model provides a centrifugal fan for an air humidifier, including a disc and a fixed ring arranged at an upper and lower distance, and multiple blades connected between the disc and the fixed ring; the inner hole of the fixed ring forms an air intake for drawing in air; the outer peripheries of the disc and the fixed ring together form a hollowed-out annular window, and the trailing edges of adjacent blades respectively protrude from the annular window and together form an air outlet for discharging air; the multiple blades are spaced apart and spirally wrapped around the rotation axis of the disc; the side of each blade facing the air intake forms an air inlet surface, and the air inlet surface has an outwardly protruding cutting edge; the cutting edge is thinner at the end near the disc and thicker at the end near the fixed ring.

[0006] Furthermore, the thickness of the cutting edge near the end of the wheel is equal to the thickness of the blade body.

[0007] Furthermore, the cross-sectional shape of the blade is arc-shaped.

[0008] Furthermore, the outer wall of the trailing edge of the blade is provided with a plurality of outwardly protruding stirring sections.

[0009] Furthermore, the mixing section has a rib structure and is equally spaced from each other; the extending direction of the rib structure is parallel to the extending direction of the rotation axis.

[0010] Furthermore, the air inlet angle of the blade is 46 to 54 degrees; and / or, the air outlet angle of the blade is 64 to 68 degrees.

[0011] This utility model provides an air humidifier, including a housing, a motor assembly, a negative pressure grille, a water spray tank, absorbent paper, a water tank, and the aforementioned centrifugal impeller; the motor assembly, the negative pressure grille, the water spray tank, the absorbent paper, the water tank, and the centrifugal impeller are respectively disposed within the housing; the motor assembly drives a disc connected to the centrifugal impeller to drive the disc, along with its blades and a fixed ring, to rotate synchronously.

[0012] Furthermore, the outer wall of the housing is provided with an air inlet and an air outlet, and the air inlet, the absorbent paper, the negative pressure grid, the centrifugal impeller and the air outlet together form an air duct.

[0013] The technical solution provided by this utility model has the following beneficial effects:

[0014] The blades are thinner at one end near the impeller and thicker at the other end near the fixing ring by the blade structure's cutting edge facing the air inlet of the centrifugal impeller. This reduces the impact of airflow on the aerodynamic performance, thereby reducing the impact intensity of the airflow on the blades and thus reducing the noise at the air inlet of the centrifugal impeller. Attached Figure Description

[0015] Figure 1 The image shown is a cross-sectional view of the air humidifier in Embodiment 1;

[0016] Figure 2 The diagram shown is a schematic diagram of the centrifugal wheel in Embodiment 1;

[0017] Figure 3 The image shown is a top view of the centrifugal wheel in Embodiment 1;

[0018] Figure 4 As shown Figure 3 Cross-sectional view of AA;

[0019] Figure 5 The diagram shown is a schematic representation of the centrifugal wheel in Example 2.

[0020] Figure 6 The image shown is a top view of the centrifugal wheel in Example 2. Detailed Implementation

[0021] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0022] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0023] Example 1

[0024] Reference Figures 1 to 4 Embodiment 1 provides an air humidifier, including a housing 300, a motor assembly 200, a negative pressure grille 400, a water spray tank 500, absorbent paper 600, a water tank 700, and a centrifugal impeller 100. The outer wall of the housing 300 has an air inlet 301 and an air outlet 302. The motor assembly 200 includes a motor bracket 202 and a motor 201 mounted on the motor bracket 202. The motor 201, motor bracket 202, negative pressure grille 400, water spray tank 500, absorbent paper 600, water tank 700, and centrifugal impeller 100 are respectively disposed inside the housing 300. The air inlet 301, absorbent paper 600, negative pressure grille 400, centrifugal impeller 100, and air outlet 302 of the housing 300 together form the air duct 800 of the air humidifier.

[0025] like Figures 2 to 4 As shown, the centrifugal impeller 100 of this embodiment includes a disc 1 and a fixing ring 2 arranged at an upper and lower distance, and a plurality of blades 3 connected between the disc 1 and the fixing ring 2. The plurality of blades 3 are spaced apart and spirally wrapped around the rotation axis 7 of the disc 1. The inner hole of the fixing ring 2 forms an air intake 5 for the centrifugal impeller 100 to draw air in. The outer periphery of the disc 1 and the fixing ring 2 together form a hollow annular window 4. The tail edge 33 of each adjacent blade 3 protrudes from the annular window 4 and together form an air outlet 6 for the centrifugal impeller 100 to discharge air.

[0026] like Figure 2 and Figure 3 As shown, each blade 3 forms an air intake surface 31 on the side facing the air inlet 5. Each air intake surface 31 has an outwardly protruding blade 32. The blade 32 is thinner at the end near the wheel 1 and thicker at the other end near the fixing ring 2.

[0027] In this embodiment, the water in the water tank 700 is pumped into the water spraying tank 500. Then, the water in the water spraying tank 500 flows into the water absorbent paper 600 from top to bottom through the water outlet located between the water spraying tank 500 and the absorbent paper 600, so as to fully wet the absorbent paper 600.

[0028] At the same time, the drive shaft of motor 201 drives the connecting wheel 1 to rotate, and drives the blades 3 and the fixed ring 2 to rotate synchronously to generate centrifugal force to form airflow. At this time, the airflow flows through the air duct 800 formed by the air inlet 301 of the housing 300, the water-absorbing paper 600, the negative pressure grille 400, the air inlet 5 of the centrifugal impeller 100, the air outlet 6 of the centrifugal impeller 100, and the air outlet 302 of the housing 300 under the action of centrifugal force. During this flow, the airflow carries away the moisture contained in the water-absorbing paper 600 to the indoor air to increase the humidity of the space surrounding the air humidifier.

[0029] More specifically, such as Figure 3 As shown, the cross-sectional shape of each blade 3 is arc-shaped, and the thickness of each cutting edge 32 near the end of the wheel 1 is equal to the thickness of the blade body 3. That is, each blade 3 adopts an airfoil curve structure with a uniformly increasing angle.

[0030] The blade 32 is thinner at one end near the impeller 1 and thicker at the other end near the fixing ring 2 on the air inlet 5 of the centrifugal impeller 100 by the blade surface 31 facing the air inlet 5 of the centrifugal impeller 100. This reduces the impact of blade structure drag on aerodynamic performance, thereby reducing the impact intensity of airflow on the blade 3 and thus reducing the noise at the air inlet 5 of the centrifugal impeller 100.

[0031] Further preferred, such as Figure 3 As shown, the air inlet angle α of blade 3 is 46 to 54 degrees, and the air outlet angle β of blade 3 is 64 to 68 degrees, in order to ensure the exhaust effect of centrifugal impeller 100.

[0032] Example 2

[0033] like Figure 5 and Figure 6 As shown, Embodiment 2 provides an air humidifier. Embodiment 2 and Embodiment 1 have largely the same structure, except that: the outer wall of the trailing edge 33 of each blade 3 is provided with a plurality of outwardly protruding mixing parts 331. Specifically, the mixing parts 331 are rib structures. The mixing parts 331 on the same blade 3 are arranged at equal intervals, and the extension direction of each rib structure is parallel to the extension direction of the rotation axis 7 of the wheel 1. This can reduce the turbulent velocity of the airflow at the trailing edge 33 of the blade 3, that is, reduce the turbulent kinetic energy, so as to further reduce noise.

[0034] Furthermore, the centrifugal impellers of Embodiment 1, Embodiment 2, and the prior art were all compared and tested with a motor speed of 1600 rpm. The comparison results of their air volume, power, and sound power are shown in Table 1.

[0035] As shown in Table 1, under the premise that the air volume of each comparison group is similar, the power measured in Example 1 and Example 2 is more than 12% lower than that of the prior art, and its noise (i.e., characterized by sound power) is also lower than that of the prior art.

[0036] In addition, the energy efficiency ratio of Example 2 (e.g., 15.33) is greater than that of Example 1 (e.g., 15.22), and the energy efficiency ratio of the prior art (e.g., 13.33) is less than that of Example 1 and Example 2. Therefore, Example 2 has the best energy efficiency ratio, where energy efficiency ratio = air volume / power.

[0037] Table 1:

[0038] Existing technology 388 29.1 58.74 Example 1 385 25.3 57.92 Example 2 377 24.6 57.83

[0039] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A centrifugal fan for an air humidifier, characterized in that: It includes a wheel and a fixed ring arranged at an upper and lower distance, and a plurality of blades connected between the wheel and the fixed ring; The inner hole of the fixed ring forms an air intake for air intake; the outer periphery of the wheel and the fixed ring together form a hollowed-out annular window, and the trailing edges of adjacent blades protrude from the annular window and together form an air outlet for air exhaust. Multiple blades are spaced apart and spirally wrapped around the axis of rotation of the wheel; The blade forms an air intake surface on the side facing the air inlet, and the air intake surface has a blade extending outward; the blade is thinner at the end near the wheel and thicker at the other end near the fixing ring.

2. The centrifugal fan of the air humidifier according to claim 1, characterized in that: The thickness of the cutting edge near the end of the wheel is equal to the thickness of the blade body.

3. The centrifugal fan of the air humidifier according to claim 1, characterized in that: The blade has an arc-shaped cross-section.

4. The centrifugal fan of the air humidifier according to claim 1, characterized in that: The outer wall of the trailing edge of the blade is provided with multiple outwardly protruding mixing sections.

5. The centrifugal fan of the air humidifier according to claim 4, characterized in that: The mixing section has a rib structure and is equally spaced from each other; the extending direction of the rib structure is parallel to the extending direction of the rotation axis.

6. The centrifugal fan of the air humidifier according to any one of claims 1-5, characterized in that: The air inlet angle of the blade is 46 to 54 degrees; and / or, the air outlet angle of the blade is 64 to 68 degrees.

7. An air humidifier, characterized in that: The device includes a housing, a motor assembly, a negative pressure grid, a water spray tank, absorbent paper, a water tank, and a centrifugal impeller as described in any one of claims 1-6; the motor assembly, the negative pressure grid, the water spray tank, the absorbent paper, the water tank, and the centrifugal impeller are respectively disposed within the housing; the motor assembly drives a wheel connected to the centrifugal impeller to drive the wheel, along with its blades and a fixed ring, to rotate synchronously.

8. The air humidifier according to claim 7, characterized in that: The outer wall of the housing has an air inlet and an air outlet, and the air inlet, the absorbent paper, the negative pressure grid, the centrifugal impeller and the air outlet together form an air duct.

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