Blade of centrifugal wind wheel, centrifugal wind wheel and air conditioning equipment

Abstract

The invention relates to the technical field of air conditioning, and provides a blade of a centrifugal wind wheel, the centrifugal wind wheel and air conditioning equipment, the blade of the centrifugal wind wheel comprises a body and a reinforcing part, the body extends in the axial direction, the side face of the body in the thickness direction is an arc face, and the reinforcing part is arranged at the air outlet end of the body. The rigidity and the strength of the air outlet end of the body are enhanced through the reinforcing part, so that deformation of the air outlet end of the blade in the rotating process of the blade is reduced or even eliminated, the blade has deformation resistance, output airflow of the blade is improved, and abnormal noise generated by deformation of the blade in the rotating process is reduced or even eliminated.

Description

Technical Field

[0001] This application relates to the technical field of air conditioning, and in particular, to a blade of a centrifugal impeller, a centrifugal impeller, and an air conditioning device. Background Art

[0002] An air conditioning device is used to adjust the indoor air, thereby improving the indoor environment. The centrifugal impeller of the air conditioning device greatly affects the air volume and noise of the air conditioning device. In the related art, during the operation of the centrifugal impeller, obvious abnormal noises such as wheezing are likely to occur, causing troubles to users and affecting the product evaluation. Summary of the Invention

[0003] In view of this, embodiments of this application are expected to provide a blade of a centrifugal impeller, a centrifugal impeller, and an air conditioning device that can reduce abnormal noises.

[0004] To achieve the above object, embodiments of this application provide a blade of a centrifugal impeller, including:

[0005] A body extending along the axial direction, and a side surface of the body in the thickness direction is an arc surface;

[0006] A strengthening portion provided at the air outlet end of the body.

[0007] In some embodiments, the strengthening portion protrudes from any one side of the body in the thickness direction.

[0008] In some embodiments, the strengthening portion bends from the air outlet end of the body toward any one side of the body in the thickness direction.

[0009] In some embodiments, the strengthening portion is in contact with or spaced apart from any one side surface of the body in its thickness direction.

[0010] In some embodiments, an included angle at the connection between the strengthening portion and the body is α, where 0°≤α≤10°.

[0011] In some embodiments, the strengthening portion extends in a zigzag manner from the air outlet end of the body away from the body.

[0012] In some embodiments, with a plane perpendicular to the axial direction as the projection plane, the projection shape of the strengthening portion is a curve.

[0013] In some embodiments, the projection shape of the strengthening portion is an arc shape or a wavy line shape.

[0014] In some embodiments, the strengthening portion extends from one end of the body along the axial direction to the other end.

[0015] In some embodiments, the number of the strengthening portions is multiple, and the multiple strengthening portions are arranged at intervals along the axial direction.

[0016] In some embodiments, the blade is a sheet metal structure.

[0017] In some embodiments, the thickness of the body is 3 mm to 6 mm.

[0018] In some embodiments, the distance between the two ends of the reinforcing portion along the width direction of the body is H, and the thickness of the reinforcing portion is d, where d < H < 4d.

[0019] An embodiment of the present application provides a centrifugal impeller, including:

[0020] The blade according to any one of the above;

[0021] A hub, and a plurality of the blades are arranged at intervals along the circumferential direction of the hub.

[0022] An embodiment of the present application further provides an air conditioning device, which is characterized by including the centrifugal impeller described above.

[0023] For the blade provided by the embodiment of the present application, on the one hand, the side surface of the body along the thickness direction is an arc surface, and the air flow flows from the air inlet end to the air outlet end approximately along the arc surface, and the air guiding amount of the body is large. On the other hand, the rigidity and strength of the air outlet end of the body are strengthened through the reinforcing portion, so as to reduce or even eliminate the deformation generated at the air outlet end of the blade during the rotation process, so that the blade can maintain its original shape during the rotation process, improve the stability of the blade during the rotation process, the blade is not easily deformed and fails, the blade has the ability to resist deformation, improve the output air flow of the blade, and thus reduce or even eliminate the abnormal noise generated by the deformation of the blade during the rotation process. The blade provided by the present application can also increase the air volume under the same power output state in a static pressure environment of and above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a centrifugal impeller in an embodiment of the present application, wherein the hollow arrow schematically shows the rotation direction R;

[0025] Figure 2 is Figure 1 a schematic structural diagram of another perspective of the centrifugal impeller shown, wherein the hollow arrow schematically shows the rotation direction R;

[0026] Figure 3 is Figure 2 an enlarged schematic diagram of a partial cross-section in ;

[0027] Figure 4 is a schematic structural diagram of the first blade in an embodiment of the present application;

[0028] Figure 5 is Figure 4Structural schematic diagram of the first type of blade from another perspective;

[0029] Figure 6 Air volume curve graphs of the blade in an embodiment of the present application and the blade in the related art;

[0030] Figure 7 Structural schematic diagram of the second type of blade in an embodiment of the present application;

[0031] Figure 8 Structural schematic diagram of the third type of blade in an embodiment of the present application;

[0032] Figure 9 Structural schematic diagram of the fourth type of blade in an embodiment of the present application;

[0033] Figure 10 Structural schematic diagram of the fifth type of blade in an embodiment of the present application;

[0034] Figure 11 Structural schematic diagram of the sixth type of blade in an embodiment of the present application;

[0035] Figure 12 For Figure 11 Structural schematic diagram of the sixth type of blade shown from another perspective.

[0036] Explanation of reference numerals

[0037] Blade 1; Body 11; Air outlet end 100; Air inlet end 200; Front side 11a; Back side 11b; Reinforcing part 12; Sub-segment 121; Mounting ear 13;

[0038] Hub 2;

[0039] Tire 3. Detailed implementation manners

[0040] Without conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other. The detailed description in the detailed implementation manners should be understood as an explanatory illustration of the purpose of the present application and should not be regarded as an improper limitation of the present application.

[0041] It should be noted that in the embodiments of the present application, unless otherwise specified, the projection refers to the projection plane perpendicular to the axial direction. It should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] In the embodiments of the present application, the unit "dB" is decibel, the unit "mm" is millimeter, the unit "Pa" is Pascal, the unit "Hz" is Hertz, the unit "kHz" is kilohertz, and the unit "m 3 / h" is cubic meter per hour.

[0043] Regarding the problem of abnormal noise in the centrifugal impeller in the related art, in the process of reducing the abnormal noise generated by the centrifugal impeller in the related art, the first solution is to widen the opening of the volute tongue of the volute. Although this solution reduces the abnormal noise, the abnormal noise still exists, and the air volume also decreases accordingly. The second solution is to increase the thickness of the blades of the centrifugal impeller. Although this solution also reduces the abnormal noise, it causes the weight of the centrifugal impeller to increase, increases the load on the motor, and increases the risk of deformation of the motor shaft. The applicant analyzed the centrifugal impeller and found that the abnormal noise of the centrifugal impeller in the related art comes from the blades of the centrifugal impeller. During the rotation of the centrifugal impeller, the air flow entering axially flows from the air inlet end of the blade towards the air outlet end. During the flow of the air flow, a force is generated on the blade. The wind speed flowing through the blade gradually increases from the air inlet end near the axis towards the air outlet end away from the axis, while the wind speed on the outer periphery of the centrifugal impeller gradually increases along the rotation direction of the centrifugal impeller starting from the volute tongue and reaches the maximum at the position of the air outlet of the volute away from the volute tongue. Since the aerodynamic force on the blade is related to the wind speed, air density, shape coefficient of the blade, height coefficient of the blade, and the windward area of the blade, among which the aerodynamic force on the blade is proportional to the square of the wind speed. The force on the blade during rotation changes dynamically, and the force on the blade gradually increases along the rotation direction of the centrifugal impeller starting from the volute tongue.

[0044] Analyzing the force on a single blade, under the action of a uniformly distributed load, the deflection formula of the blade is: F = q*L / 2EI. From this, it can be known that: L = 2FEI / q, where F represents the bending stress, q represents the intensity of the concentrated force or distributed force perpendicular to the axis of the blade, L represents the span, that is, the distance between the action points of the concentrated force or distributed force, E represents the elastic modulus of the material of the blade, and I represents the moment of inertia of the blade. According to the force analysis, the force on the air outlet end of the blade is much greater than that on the air inlet end. The air outlet end of the blade will produce a deformation of deflecting a large angle around the air inlet end of the blade, and the magnitude of the force on the air outlet end of the blade is different at different positions of the blade in the volute. The amount of deformation generated by the air outlet end of the blade will change continuously. Along with the deformation of the air outlet end of the blade, the air flow generated by the centrifugal impeller in the volute is unstable, which not only causes the air volume to decrease, but also causes the sound generated during the rotation of the centrifugal impeller to be unstable, such as generating a rhythmic fluctuation, that is, wheezing, and this wheezing becomes an unacceptable abnormal noise. Conducting a spectrum test on the abnormal noise, the test results show that the abnormal noise spectrum range is concentrated between 0 Hz and 6.5 kHz, and the volume is between 25 dB and 35 dB.

[0045] In view of this, please refer to Figures 4 to 12 , an embodiment of the present application provides a blade 1 of a centrifugal wind wheel. The blade 1 of the centrifugal wind wheel includes a main body 11 and a reinforcement portion 12. The main body 11 extends in an axial direction, and the side surface of the main body 11 in the thickness direction is an arc surface. The reinforcement portion 12 is arranged at the air outlet end 100 of the main body 11. In other words, with the plane perpendicular to the axial direction as the projection plane, the projection of the side surface of the main body 11 in the thickness direction is in an arc shape. In other words, the main body 11 is roughly an arc-shaped plate-like structure.

[0046] Please note that Figure 4 The air outlet end 100 and the air inlet end 200 are two opposite ends of the body 11 along the width direction thereof, wherein the air outlet end 100 is the end of the body 11 away from the rotation axis of the centrifugal wind wheel along the width direction, and the air inlet end 200 is opposite to the air outlet end 100, and the air inlet end 200 is the end of the body 11 close to the rotation axis of the centrifugal wind wheel along the width direction, and the airflow from the axial direction enters from the air inlet end 200 and flows out from the air outlet end 100. The length direction of the body 11 is consistent with the axial direction. The thickness direction of the body 11, the length direction of the body 11, and the width direction of the body 11 are perpendicular to each other.

[0047] The blade 1 provided in the embodiment of the present application, on the one hand, has a curved side surface along the thickness direction of the body 11, and the airflow flows roughly along the curved surface from the air inlet end 200 to the air outlet end 100, and the air volume of the body 11 is large. On the other hand, the rigidity and strength of the air outlet end 100 of the body 11 are strengthened by the reinforcement part 12, thereby reducing or even eliminating the deformation of the air outlet end 100 of the blade 1 during the rotation process of the blade 1, so that the blade 1 can maintain its original shape during the rotation process, improve the stability of the blade 1 during the rotation process, and the blade 1 is not easy to deform and fail, so that the blade 1 has anti-deformation ability, improves the output airflow of the blade 1, thereby reducing or even eliminating the abnormal sound caused by the deformation of the blade 1 during the rotation process. The blade 1 provided in the present application can also increase the air volume in a static pressure environment of 125Pa or above under the same power output state.

[0048] For example, under the same static pressure, the blade 1 of the present application and the blade in the related art are respectively tested for air volume at different powers, see Figure 6 , Figure 6 is a wind volume curve at a static pressure of 200Pa, wherein S2 is a test curve of a blade in the related art, and S1 is a test curve of blade 1 of the present application. Figure 6 It can be seen that the air volume of the blade 1 of the present application is larger under the same power. According to calculations, under the condition of a static pressure of 200 Pa, the air volume of the blade 1 of the present application can be increased by about 5% to 10% under the same power compared with the blades in the related art.

[0049] Exemplarily, through laboratory testing of the sound spectrum of the blade 1 of the present application, the sound spectrum of the blade 1 of the present application is relatively smooth. The decibel value becomes relatively smaller between the frequencies of 3.5 kHz and 6.5 kHz, and the data of high-frequency sounds becomes less. Therefore, the blade 1 of the present application can effectively reduce or even eliminate abnormal sounds.

[0050] In one embodiment, the blade 1 is made of a metal material. The blade 1 made of a metal material has the characteristic of high strength and can output a large amount of air volume.

[0051] In one embodiment, the blade 1 has a sheet metal structure. The sheet metal structure is a structure formed by cold working such as stamping, shearing, and / or bending of a metal plate. That is to say, the blade 1 is a structure formed by cold working such as stamping, shearing, and / or bending of a metal plate. The thickness of each part of the blade 1 is basically the same. That is to say, the thickness of the main body 11 is the same as the thickness of the strengthening part 12. The blade 1 adopts a sheet metal structure, which has good structural strength, is simple to manufacture and process, and is easy to form.

[0052] Exemplarily, in one embodiment, the strengthening part 12 is formed by stamping and / or bending. Through stamping and / or bending, the metal plate undergoes plastic deformation to form the strengthening part 12. In this way, the stiffness and strength of the air outlet end 100 of the main body 11 can be improved.

[0053] In one embodiment, please refer to Figures 7 to 12 , with the plane perpendicular to the axial direction as the projection plane, the projection shape of the side surface of the main body 11 in the thickness direction is an arc line shape.

[0054] In one embodiment, please refer to Figures 7 to 12 , the part of the main body 11 between the air inlet end 200 and the air outlet end 100 bulges towards the back side in the thickness direction. In this way, the front side surface 11a of the main body 11 facing the front side is a concave arc surface, and the air guiding amount is large.

[0055] It should be noted that the front side is the side where the main body 11 is consistent with the rotation direction of the blade 1 in the thickness direction, and the back side is the side opposite to the front side. The back side is the side where the main body 11 is opposite to the rotation direction of the blade 1 in the thickness direction. Please refer to Figures 7 to 12 , the front side surface 11a of the main body 11 facing the front side is the windward surface, and the back side surface 11b of the main body 11 facing the back side is the leeward surface.

[0056] In one embodiment, please refer to Figure 5, the thickness D of the body 11 is 3 mm to 6 mm. Exemplarily, the thickness D of the body 11 is 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, or 6 mm, etc. The blades in the related art need to be 8 mm or more to achieve the same air volume as the blade 1 of the present application, and there will be abnormal noises in the blades of the related art. Since the present application adopts the arc-shaped body 11 and the reinforcing portion 12 is provided at the air outlet end 100 of the body 11, the thickness D of the body 11 can be 3 mm to 6 mm. In this way, the thickness of the body 11 can be effectively thinned, which can not only reduce the cost, but also reduce the weight of the centrifugal impeller and reduce the risk of centrifugal impeller failure caused by dropping or impact during the transportation or handling of the product.

[0057] In one embodiment, please refer to Figure 5 , the thickness of the reinforcing portion 12 is the same as the thickness of the body 11. Exemplarily, the thickness of the reinforcing portion 12 is 3 mm to 6 mm. The blade 1 can be a sheet metal structure.

[0058] In one embodiment, please refer to Figure 5 , the distance between the two ends of the reinforcing portion 12 along the width direction of the body 11 is H, and the thickness of the reinforcing portion 12 is d, where d < H < 4d. In this way, the reinforcing portion 12 can effectively strengthen the stiffness of the air outlet end 100 of the body 11 without excessively increasing the total mass of the blade 1, making the total weight of the blade 1 appropriate and taking into account the requirements of stiffness and weight.

[0059] In one embodiment, please refer to Figure 5 , Figure 7 , Figure 8 , Figure 9 , Figure 11 and Figure 12 , the reinforcing portion 12 protrudes from any one side of the body 11 in the thickness direction. Exemplarily, in some embodiments, please refer to Figure 7 , Figure 11 and Figure 12 , the reinforcing portion 12 protrudes from the positive side of the body 11 in the thickness direction. In some other embodiments, please refer to Figure 5 , Figure 8 and Figure 9 , the reinforcing portion 12 protrudes from the back side of the body 11 in the thickness direction. In this way, while strengthening the stiffness of the blade 1, the influence of the reinforcing portion 12 on the overall width of the blade 1 is minimized as much as possible. When the static pressure is higher than 125 Pa, the protruding of the reinforcing portion 12 from the positive side of the body 11 in the thickness direction will affect the air volume, and the protruding of the reinforcing portion 12 from the positive side of the body 11 will cause the air volume to decrease relatively compared with the protruding of the reinforcing portion 12 from the back side of the body 11. In other words, more preferably, the reinforcing portion 12 protrudes from the back side of the body 11 in the thickness direction.

[0060] In one embodiment, please refer toFigure 5 , Figure 7 , Figure 8 and Figure 9 , the reinforcing portion 12 is bent from the air outlet end 100 of the main body 11 toward any one side of the main body 11 in the thickness direction. Exemplarily, in some embodiments, please refer to Figure 7 , the reinforcing portion 12 is bent from the air outlet end 100 of the main body 11 toward the front side. In some other embodiments, please refer to Figure 5 , Figure 8 and Figure 9 , the reinforcing portion 12 is bent from the air outlet end 100 of the main body 11 toward the back side. Taking the blade 1 as a sheet metal structure as an example, the reinforcing portion 12 and the main body 11 can be obtained by bending one end of a metal plate along the width direction. Designed in this way, the air outlet end 100 of the reinforcing portion 12 and the main body 11 is hardened by the force during the processing, and the stiffness of the air outlet end 100 of the blade 1 can be increased by at least two times. When the static pressure is not less than 125 Pa, the reinforcing portion 12 is bent from the air outlet end 100 of the main body 11 toward the back side, and the air volume is larger.

[0061] In one embodiment, the reinforcing portion 12 includes a plurality of sub-segments 121, and the plurality of sub-segments 121 are sequentially connected along the width direction of the main body 11, and the sub-segment 121 closest to the air outlet end 100 of the main body 11 is connected to the air outlet end 100 of the main body 11. Exemplarily, in one embodiment, please refer to Figure 8 , the reinforcing portion 12 includes two sub-segments 121, and the included angle between the two sub-segments 121 is less than 180°. That is to say, taking the plane perpendicular to the axial direction as the projection plane, the projection shapes of the two sub-segments 121 are roughly V-shaped, and the large end of the V shape faces the main body 11, which is roughly triangular. Designed in this way, the reinforcing portion 12 is bent multiple times to further improve the stiffness. Conducting a sound spectrum test on the blade 1 in this embodiment, the wheezing abnormal sound basically disappears, greatly improving the noise reduction effect.

[0062] In one embodiment, please refer to Figure 9 , the reinforcing portion 12 is wound into a superior arc shape. In another embodiment, please refer to Figure 5 and Figure 7 , the reinforcing portion 12 is in an inferior arc shape. Conducting a sound spectrum test on the blade 1 in this embodiment, the wheezing abnormal sound basically disappears, and moreover, when the static pressure is high, such as when the static pressure is not less than 125 Pa, the air volume is effectively improved.

[0063] In one embodiment, please refer to Figure 11 and Figure 12 , a part of the air outlet end 100 of the main body 11 is stamped to form the reinforcing portion 12. That is to say, the reinforcing portion 12 is formed by stamping. Conducting a sound spectrum test on the blade 1 in this embodiment, the wheezing abnormal sound is reduced.

[0064] In one embodiment, please refer to Figure 5, and Figures 7 to 9 , the reinforcing part 12 is attached to or spaced from any one side surface of the main body 11 along its thickness direction. Exemplarily, in some embodiments, please refer to Figure 5 , the reinforcing part 12 is attached to the front side surface 11a or the back side surface 11b of the main body 11. In this way, the curvature of the reinforcing part 12 and the main body 11 can be the same. The air outlet end 100 of the main body 11 and the reinforcing part 12 are stacked along the thickness direction, and the stiffness of the air outlet end 100 of the blade 1 is increased by more than twice.

[0065] Exemplarily, please refer to Figure 5 , the reinforcing part 12 is bent from the air outlet end 100 of the main body 11 towards the back side of the main body 11, and the reinforcing part 12 is attached to the back side surface 11b of the main body 11. Conduct a sound spectrum test on the blade 1 in this embodiment, and the wheezing abnormal sound basically disappears, and the air volume is effectively increased under high static pressure.

[0066] In some embodiments, please refer to Figures 7 to 9 , the reinforcing part 12 is spaced from the front side surface 11a or the back side surface 11b of the main body 11. In this way, a cavity is formed between the reinforcing part 12 and any one side surface of the main body 11 along the thickness direction.

[0067] In one embodiment, please refer to Figure 8 , the included angle at the connection between the reinforcing part 12 and the main body 11 is α, where 0° ≤ α ≤ 10°. When α is 0, the reinforcing part 12 is attached to the main body 11. With such a design, it is avoided that the reinforcing part 12 hinders the air flow, and 0° ≤ α ≤ 10° is beneficial to the smooth air flow and reduces turbulence.

[0068] Exemplarily, in one embodiment, the projected shape of the reinforcing part 12 is arc-shaped, and the included angle at the connection between the reinforcing part 12 and the main body 11 refers to: the included angle between the first tangent line at the connection part of the reinforcing part 12 and the main body 11 and the second tangent line at the connection part of the main body 11 and the reinforcing part 12.

[0069] In one embodiment, please refer to Figure 10 , the reinforcing part 12 extends tortuously from the air outlet end 100 of the main body 11 in a direction away from the main body 11. Tortuous extension means that the extending path of the reinforcing part 12 is not a straight line but a winding curve. That is to say, the curvature of at least one part of the reinforcing part 12 is not zero. For example, the reinforcing part 12 extends in a wavy line. That is to say, the reinforcing part 12 has at least one wave valley and wave peak. In this way, by bending the reinforcing part 12 multiple times, the stiffness of the blade 1 is increased to a greater extent. Conduct a sound spectrum test on the blade 1 in this embodiment, and the wheezing abnormal sound basically disappears.

[0070] Comparing the two embodiments where the reinforcing portion 12 extends in a zigzag manner away from the air outlet end 100 of the main body 11 and where the reinforcing portion 12 is bent from the air outlet end 100 of the main body 11 toward any one side of the main body 11 in the thickness direction, the blade 1 in both embodiments can substantially eliminate the wheezing abnormal sound. In the high static pressure state, that is, the state where the static pressure is not less than 125 Pa, in the embodiment where the air outlet end 100 of the main body 11 is bent toward any one side of the main body 11 in the thickness direction, the air volume is relatively larger.

[0071] In one embodiment, please refer to Figure 5 , and Figures 7 to 9 . Taking the plane perpendicular to the axial direction as the projection plane, the projected shape of the reinforcing portion 12 is curved. In this way, the reinforcing portion 12 can be hardened by force to improve the strength.

[0072] In one embodiment, please refer to Figure 5 , and Figures 7 to 9 . The projected shape of the reinforcing portion 12 is arc-shaped or wavy. The arc shape includes, but is not limited to, circular arc shape or elliptical arc shape.

[0073] Exemplarily, in one embodiment, please refer to Figure 5 . Both the reinforcing portion 12 and the main body 11 are circular arc-shaped, and the reinforcing portion 12 is attached to the back side 11b of the main body 11. That is to say, the radius of curvature of the reinforcing portion 12 is the same as that of the main body 11. In another embodiment, please refer to Figure 7 . Both the reinforcing portion 12 and the main body 11 are circular arc-shaped, and the reinforcing portion 12 is spaced from the back side 11b of the main body 11. That is to say, the radius of curvature of the reinforcing portion 12 is different from that of the main body 11.

[0074] In one embodiment, please refer to Figure 4 , Figure 5 , and Figures 7 to 10 . The reinforcing portion 12 extends from one end of the main body 11 in the axial direction to the other end. That is to say, the length of the reinforcing portion 12 in the axial direction is equal to the length of the main body 11. In this way, it is convenient to effectively enhance the stiffness of each part of the main body 11 in the axial direction.

[0075] In one embodiment, the number of the reinforcing portions 12 is multiple, and the multiple reinforcing portions 12 are arranged at intervals in the axial direction. Exemplarily, please refer to Figures 11 to 12 . A plurality of spaced portions of the air outlet end 100 of the main body 11 in the axial direction are stamped to form a plurality of reinforcing portions 12. In this way, it is possible to further avoid increasing the total weight of the blade 1.

[0076] In one embodiment, please refer to Figure 5 , and Figures 7 to 12 . The blade 1 includes mounting ears 13, and one mounting ear 13 is provided at each of the two ends of the main body 11 in the axial direction. The mounting ears 13 are used to fix the blade 1.

[0077] Please refer to Figures 1 to 5 , this application provides a centrifugal impeller. The centrifugal impeller includes the blade 1 and the hub 2 in any one of the embodiments of this application, and a plurality of blades 1 are arranged at intervals along the circumferential direction of the hub 2. The hub 2 provides an installation position for the plurality of blades 1. The hub 2 drives the plurality of blades 1 to rotate synchronously. The air flow enters the inside of the centrifugal impeller axially and then flows out of the centrifugal impeller from the air inlet end 200 of the blade 1 towards the air outlet end 100.

[0078] The centrifugal impeller provided by the embodiment of this application is applicable to air conditioning equipment with high static pressure, that is, the static pressure is not less than 125 Pa, and is particularly applicable to air conditioning equipment with a static pressure of 200 Pa to 250 Pa.

[0079] In one embodiment, please refer to Figures 1 to 5 , the centrifugal impeller includes two wheel rims 3, the two wheel rims 3 are arranged at intervals along the axial direction, the hub 2 is located between the two wheel rims 3, the blade 1 is inserted through the hub 2, and the two axial ends of the blade 1 are respectively connected to the two wheel rims 3. Exemplarily, the two mounting ears 13 of the blade 1 are respectively connected to the two wheel rims 3. The stability of the blade 1 fixation can be strengthened through the wheel rims 3 and the hub 2.

[0080] Exemplarily, in one embodiment, please refer to Figure 1 and Figure 2 , the wheel rim 3 is in a circular ring shape. In this way, it is convenient for the air flow to enter the inside of the centrifugal impeller axially.

[0081] This application provides an air conditioning equipment, and the air conditioning equipment includes the centrifugal impeller in any one of the embodiments of this application. The centrifugal impeller is used to drive the air flow to flow, so that the air conditioning equipment plays a role in adjusting the environment.

[0082] In one embodiment, the air conditioning equipment includes a volute, and the centrifugal impeller is located inside the volute.

[0083] The air conditioning equipment can be an air duct machine. When the static pressure is not less than 125 Pa, the air volume of the centrifugal impeller of this application will gradually increase under the same power (a high-static-pressure air duct machine needs to provide a static pressure of more than 125 Pa, even up to 250 Pa). After testing, the air volume of the centrifugal impeller provided by the embodiment of this application is in the range of 1500 m 3 / h - 2000 m 3 / h, and it is in a high-efficiency operation state. Under almost the same power condition, the centrifugal impeller provided by the embodiment of this application can provide a higher total pressure.

[0084] In one embodiment, the air duct machine includes a housing and a heat exchange device. Air inlets and air outlets are respectively formed on two side surfaces of the housing in the front-rear direction. The heat exchange device and the centrifugal fan are both disposed inside the housing, and the heat exchange device and the centrifugal fan are arranged in the front-rear direction, wherein the front-rear direction is perpendicular to the up-down direction. The air duct machine can be installed on the ceiling. For example, the housing can be hoisted onto the ceiling. The centrifugal fan is used to drive the indoor air flow to enter the housing through the air inlet, flow through the heat exchange device, and then be discharged from the housing through the air outlet. The heat exchange device is used to realize the heat exchange between the refrigerant and the air flow to adjust the air flow temperature. The centrifugal fan provided in the present application can provide a stable air flow in the working state, effectively eliminate the wheezing abnormal sound caused by the unstable air flow, and enable the heat exchange device to have stable heat exchange.

[0085] The housing can be generally in the shape of a hollow hexahedron structure.

[0086] In one embodiment, the ratio of the diameter of the centrifugal fan of the present application to the length of the centrifugal fan along the axial direction can be greater than 1:1. Under the condition of ensuring the air volume, the diameter of the centrifugal fan of the present application can be reduced. Therefore, the centrifugal fan of the present application can be disposed in a housing with a relatively small height in the up-down direction.

[0087] Exemplarily, in one embodiment, the ratio of the diameter of the centrifugal fan of the present application to the length of the centrifugal fan along the axial direction can be 1.2:1. For example, the diameter of the centrifugal fan is 270 mm, and the length of the centrifugal fan along the axial direction is 300 mm. The larger the ratio of the diameter of the centrifugal fan to the length of the centrifugal fan along the axial direction, the easier it is for the fan to be spirally twisted and deformed under high speed and high pressure. By adopting the above ratio, the centrifugal fan can be placed in a housing with a relatively small height in the up-down direction and can meet the requirement of a large air volume.

[0088] As described above, the above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A blade of a centrifugal impeller, characterized in that, Comprising: A body extending axially, with the side surface of the body in the thickness direction being an arc surface; A strengthening portion provided at the air outlet end of the body.

2. The blade according to claim 1, characterized in that, The strengthening portion protrudes from any one side of the body in the thickness direction.

3. The blade according to claim 1, characterized in that, The strengthening portion bends from the air outlet end of the body towards any one side of the body in the thickness direction.

4. The blade according to claim 3, characterized in that, The strengthening portion is in contact with or spaced from any one side surface of the body in its thickness direction.

5. The blade according to claim 4, characterized in that, The included angle at the connection between the strengthening portion and the body is α, where 0° ≤ α ≤ 10°.

6. The blade according to claim 1, characterized in that, The strengthening portion extends in a zigzag manner from the air outlet end of the body away from the body.

7. The blade according to claim 1, characterized in that, Taking a plane perpendicular to the axis as the projection plane, the projection shape of the strengthening portion is curved.

8. The blade according to claim 7, characterized in that, The projection shape of the strengthening portion is arc-shaped or wavy.

9. The blade according to claim 1, characterized in that, The strengthening portion extends from one end of the body along the axis to the other end.

10. The blade according to claim 1, characterized in that, The number of the strengthening portions is multiple, and the multiple strengthening portions are arranged at intervals along the axis.

11. The blade according to any one of claims 1 to 10, characterized in that, The blade is of a sheet metal structure.

12. The blade according to any one of claims 1 to 10, characterized in that, The thickness of the body is 3 mm to 6 mm.

13. The blade according to any one of claims 1 to 10, characterized in that, The distance between the two ends of the strengthening portion along the width direction of the body is H, and the thickness of the strengthening portion is d, where d < H < 4d.

14. A centrifugal impeller, characterized in that, Comprising: The blade according to any one of claims 1 to 13; A hub, with multiple blades arranged at intervals along the circumferential direction of the hub.

15. An air conditioning device, characterized in that, Including the centrifugal air impeller according to claim 14.

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