Multi-wing centrifugal impeller and range hood

Abstract

The multi-wing centrifugal impeller comprises a wing blade assembly, a first blade fixing part, a second blade fixing part and a blade, the first blade fixing part and the second blade fixing part are arranged in parallel, the blade is arranged between the first blade fixing part and the second blade fixing part, and the two ends of the blade are connected to the first blade fixing part and the second blade fixing part respectively; the wing blade assembly comprises an annular wing blade support, an inner wheel disc and a plurality of wing blades arranged between the annular wing blade support and the inner wheel disc, the two ends of each wing blade are connected to the inner edge of the annular wing blade support and the outer edge of the inner wheel disc respectively, and each wing blade is a curved plate with the middle bent in the direction where the first blade fixing part is located. A plurality of blade fixing holes are formed in the annular wing blade support, the blades penetrate through the blade fixing holes, and the blades are arranged on the annular wing blade support through the blade fixing holes. And therefore, the flow of the multi-wing centrifugal impeller and the working capacity of the front side of the multi-wing centrifugal impeller are increased, and the performance of the multi-wing centrifugal impeller is improved.

Description

Technical Field

[0001] The present application relates to the technical field of range hoods, and in particular to a multi-blade centrifugal impeller and a range hood. Background Art

[0002] A multi-blade centrifugal impeller refers to an impeller that has axial air intake and radial air discharge, and uses centrifugal force to do work depending on the rotation speed and outer diameter to increase the pressure of the air. Among them, the multi-blade centrifugal impeller includes multi-blade blades, but the multi-blade blades usually have weak work ability on the air due to the inertia of axial air intake. How to adjust, improve and make good use of the blades is an important way to further improve the overall work ability of the multi-blade centrifugal impeller. Utility Model Content

[0003] In order to solve the problems of the prior art, the present application provides a multi-blade centrifugal impeller and a range hood, that is, the present application arranges a plurality of blades whose middle parts are bent toward the direction of the first blade fixing portion between the annular wing blade bracket and the inner wheel disc, so as to achieve a guiding effect on the airflow, thereby increasing the flow rate of the multi-blade centrifugal impeller and the working capacity of the front side of the multi-blade centrifugal impeller, thereby improving the performance of the multi-blade centrifugal impeller.

[0004] The present application provides a multi-blade centrifugal impeller, comprising a wing blade assembly and a first blade fixing portion and a second blade fixing portion arranged in parallel, and a blade arranged between the first blade fixing portion and the second blade fixing portion, wherein both ends of the blade are respectively connected to the first blade fixing portion and the second blade fixing portion;

[0005] The wing blade assembly comprises an annular wing blade bracket, an inner wheel disc and a plurality of wing blades arranged between the annular wing blade bracket and the inner wheel disc, the two ends of the wing blade are respectively connected to the inner edge of the annular wing blade bracket and the outer edge of the inner wheel disc, and the wing blade is a curved plate with a middle portion bent toward the direction where the first blade fixing portion is located;

[0006] The annular wing-blade support is provided with a plurality of blade fixing holes, the blades pass through the blade fixing holes, and the blades are arranged on the annular wing-blade support through the blade fixing holes.

[0007] Furthermore, the annular wing blade bracket is arranged parallel to the inner wheel disc, and there is a preset interval between the plane where the annular wing blade bracket is located and the plane where the inner wheel disc is located.

[0008] Furthermore, the bending angle of the wing blade gradually decreases from the side close to the inner wheel disc to the side close to the annular wing blade support, and the bending angle is the difference between the angle between the tangent direction on one side of the wing blade and the vertical direction and the angle between the tangent direction on the other side of the wing blade and the vertical direction.

[0009] Furthermore, a chord length corresponding to a cross section of the wing blade close to the inner wheel disc is smaller than a chord length corresponding to a cross section of the wing blade close to the annular wing blade support.

[0010] Furthermore, the angle between the tangent direction of the wing blade and the vertical direction gradually decreases from the side close to the inner wheel disc to the side close to the annular wing blade support.

[0011] Furthermore, the first blade fixing portion and the second blade fixing portion are both annular structures, and the plurality of blades are arranged along the circumferential direction of the first blade fixing portion.

[0012] Furthermore, a ratio of a chord length corresponding to a cross section of the blade close to a side of the annular blade support to an outer diameter of the blade is greater than a first preset threshold.

[0013] Further, if the number of the blades is greater than a preset number threshold, 4-6 times the number of the wing blades is greater than or equal to the number of the blades.

[0014] Furthermore, the wing blade assembly also includes a guide wing blade, one end of the guide wing blade is fixed to the annular wing blade bracket, and the other end of the guide wing blade is bent in a direction away from the wing blade.

[0015] The present application also provides a range hood, which comprises the multi-blade centrifugal impeller as described above.

[0016] The implementation of this application has the following beneficial effects:

[0017] The present application arranges a plurality of blades between the annular blade support and the inner wheel disc, the middle of which is bent toward the direction of the first blade fixing portion, so as to guide the airflow, thereby increasing the flow rate of the multi-blade centrifugal impeller and the working capacity of the front side of the multi-blade centrifugal impeller, thereby improving the performance of the multi-blade centrifugal impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments or prior art descriptions. Obviously, the drawings described below are only some embodiments of the present application, and a person of ordinary skill in the art can obtain other drawings based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of the structure of a multi-blade centrifugal impeller provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the structure of a range hood provided in an embodiment of the present application;

[0021] Figure 3-Figure 5Schematic diagram of the structure of the wing blade assembly at different angles provided in the embodiment of the present application;

[0022] Figure 6 A side view of a multi-blade centrifugal impeller provided in an embodiment of the present application;

[0023] Figure 7 A schematic diagram of blade trajectories provided in an embodiment of the present application;

[0024] Figure 8 A schematic diagram of a cross-section of a wing blade at end A provided in an embodiment of the present application;

[0025] Fig. 9 A schematic diagram of a cross-section of a wing blade at end B provided in an embodiment of the present application;

[0026] Fig.10 Schematic diagram of the structure of the double-suction multi-blade centrifugal impeller provided in the embodiment of the present application Figure 1 ;

[0027] Fig.11 Schematic diagram of the structure of the multi-double suction multi-blade centrifugal impeller provided in the embodiment of the present application Figure 2 ;

[0028] Figure 12-13 A schematic diagram of the structure of another wing blade assembly at different angles provided in an embodiment of the present application;

[0029] Among them, the reference numerals in the figure correspond to: 1-wing blade assembly; 11-annular wing blade bracket; 112-blade fixing hole; 12-inner wheel disc; 13-wing blade; 14-guide blade; 2-first blade fixing part; 3-second blade fixing part; 4-blade. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0031] It should be noted that in this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] Hereinafter, embodiments will be described with reference to the accompanying drawings, which do not limit the disclosure described in the claims in any way.

[0033] See also Figure 1-Figure 13 , the following combination Figure 1-Figure 13 A multi-blade centrifugal impeller provided in an embodiment of the present application is described in detail.

[0034] The present application embodiment provides a multi-blade centrifugal impeller, such as Figure 1-Figure 13 As shown, the multi-blade centrifugal impeller specifically comprises a wing blade assembly 1 and a first blade fixing portion 2 and a second blade fixing portion 3 arranged in parallel, and a blade 4 arranged between the first blade fixing portion 2 and the second blade fixing portion 3, and the two ends of the blade 4 are respectively connected to the first blade fixing portion 2 and the second blade fixing portion 3, wherein the wing blade assembly 1 comprises an annular wing blade bracket 11, an inner wheel disc 12 and a plurality of wing blades 13 arranged between the annular wing blade bracket 11 and the inner wheel disc 12, and the two ends of the wing blade 13 are respectively connected to the inner edge of the annular wing blade bracket 11 and the outer edge of the inner wheel disc 12, and the wing blade 13 is a curved panel with the middle portion bent toward the direction of the first blade fixing portion 2; a plurality of blade fixing holes 112 are provided on the annular wing blade bracket 11, and the blade 4 passes through the blade fixing hole 112, and the blade 4 is arranged on the annular wing blade bracket 11 through the blade fixing hole 112.

[0035] In the embodiment of the present application, a plurality of blades 13 whose middle portions are bent toward the direction where the first blade fixing portion 2 is located are arranged between the annular blade bracket 11 and the inner wheel disc 12, so that the blades 13 with a preset degree of bending can be used to guide the airflow, thereby increasing the flow rate of the multi-blade centrifugal impeller and the working capacity of the front side of the multi-blade centrifugal impeller, thereby improving the performance of the multi-blade centrifugal impeller.

[0036] Specifically, the wing blade 13 is a curved panel with the middle portion bent toward the direction of the first blade fixing portion 2, and the direction of the airflow can be changed by utilizing the trajectory surface of the wing blade 13 with a preset degree of bending. In a specific embodiment, the axially entering airflow can be converted into a radially outgoing airflow, so as to achieve a guiding effect on the airflow.

[0037] In some embodiments, the first blade fixing portion 2 and the second blade fixing portion 3 are both annular structures, and multiple blades 4 are arranged obliquely along the circumferential direction of the first blade fixing portion 2. The first blade fixing portion 2 and the second blade fixing portion 3 with annular structures are used to fix the blades 4 inclined toward one side. When the airflow flows out from one end of the wing blade 13, that is, the airflow flows out radially, and then the airflow flowing out radially acts on the blade 4, so that the airflow is discharged by using the blade 4.

[0038] It should be noted that the axial direction is a direction perpendicular to the plane where the inner wheel disc 12 is located, and the radial direction is a direction parallel to the plane where the inner wheel disc 12 is located.

[0039] In an optional embodiment, the angle between the tangent direction of the blade 13 and the vertical direction gradually decreases from the side close to the inner wheel disc 12 to the side close to the annular blade support 11 .

[0040] For details, see Figure 3 and Figure 7 The angle between the tangent direction of the blade 13 and the vertical direction is angle a, the A end is the side close to the inner wheel disc 12, and the B end is the side close to the annular blade bracket 11. The arrow directions marked on the right side of the A end and the upper side of the B end indicate the airflow direction, and the trajectory surface of the blade 13 can be used to convert the axially entering airflow into the radially outgoing airflow, so as to achieve the guiding effect on the airflow.

[0041] Continue to see Figure 7 After the axial airflow is sucked into the multi-blade centrifugal impeller, due to the action of the trajectory surface of the blade 13, the blade 13 exerts a force on the airflow as follows Figure 7 As shown, the forces exerted by the blades 13 on the airflow are the axial force Fz and the radial force Fy. Specifically, the axial force Fz can balance the airflow inlet pressure, so that the airflow at the outlet of the multi-blade centrifugal impeller moves toward the front disk, increasing the working capacity of the blades 4 near the front disk. The radial force Fy is an additional centrifugal force, which has the effect of increasing the fan flow.

[0042] Furthermore, since the blade 13 has a trajectory surface with a certain degree of curvature, the ratio of the axial force Fz to the radial force Fy increases continuously from the airflow inlet end to the airflow outlet end, that is, at the airflow inlet end, the radial force Fy is greater than the axial force Fz, and thus, the ability to increase the flow at the airflow inlet end is stronger than that at the airflow outlet end, while at the airflow outlet end, the radial force Fy is smaller than the axial force Fz, and thus the ability to balance the inlet pressure at the airflow outlet end is stronger than that at the airflow inlet end, so that the airflow moves toward the front disk side, thereby increasing the working capacity of the blade 4 near the front disk, wherein the airflow inlet end is end A and the airflow outlet end is end B.

[0043] In an optional embodiment, the annular blade support 11 is arranged parallel to the inner wheel disc 12 , and there is a preset interval between the plane where the annular blade support 11 is located and the plane where the inner wheel disc 12 is located.

[0044] For details, see Figure 3-Figure 5 The plane where the annular blade support 11 is located is not coplanar with the plane where the inner wheel disc 12 is located, wherein the relationship between the distance L2 from the plane where the inner wheel disc 12 is located to the front side of the blade 4 and the length L1 of the blade 4 is 0.1*L1 <L2<0.4*L1。

[0045] Further, let the average axial air inlet velocity of the multi-wing centrifugal impeller be va, and the average radial air outlet velocity be vr. Then, when L2 / L1 = 0.1, the angle a between the tangent direction of the vane 13 at end A and the vertical direction is greater than 0.125*arctan(vr / va) and less than 0.4*arctan(vr / va). Preferably, the angle a between the tangent direction of the vane 13 at end A and the vertical direction is equal to 0.2*arctan(vr / va). When L2 / L1 = 0.4, the angle a between the tangent direction of the vane 13 at end A and the vertical direction is greater than 0.5*arctan(vr / va) and less than 0.75*arctan(vr / va). Preferably, the angle a between the tangent direction of the vane 13 at end A and the vertical direction is equal to 0.65*arctan(vr / va). When 0.1 < L2 / L1 < 0.4, the angle a between the tangent direction of the vane 13 at end A and the vertical direction can be linearly valued.

[0046] In an alternative embodiment, the bending angle of the vane 13 gradually decreases from the side close to the inner disk 12 to the side close to the annular vane support 11. The bending angle is the difference between the angle between the tangent direction of one side of the vane 13 and the vertical direction and the angle between the tangent direction of the other side of the vane 13 and the vertical direction.

[0047] Specifically, please refer to Figure 8 and Fig. 9 , the angle between the tangent direction of one side of the vane 13 at end A and the vertical direction is b2, the angle between the tangent direction of the other side of the vane 13 at end A and the vertical direction is b1. Then, the bending angle of the side of the vane 13 close to the inner disk 12 is b2 - b1. The angle between the tangent direction of one side of the vane 13 at end B and the vertical direction is c2, the angle between the tangent direction of the other side of the vane 13 at end B and the vertical direction is c1. Then, the bending angle of the side of the vane 13 close to the annular vane support 11 is c2 - c1.

[0048] Among them, the bending angle of the side of the vane 13 close to the inner disk 12 is less than 40 degrees, the bending angle of the side of the vane 13 close to the annular vane support 11 is less than 15 degrees. The degree of the angle b1 between the tangent direction of the other side of the vane 13 at end A and the vertical direction is between 0 degrees and 3 degrees, and the degree of the angle c1 between the tangent direction of the other side of the vane 13 at end B and the vertical direction is between 0 degrees and 2 degrees.

[0049] In an alternative embodiment, the chord length corresponding to the cross-section of the side of the vane 13 close to the inner disk 12 is less than the chord length corresponding to the cross-section of the side of the vane 13 close to the annular vane support 11.

[0050] Specifically, please continue to refer to Figure 8 and Fig. 9The chord length corresponding to the cross section of the blade 13 close to the inner wheel disk 12 is m1, and the chord length corresponding to the cross section of the blade 13 close to the annular blade support 11 is m2. The chord length corresponding to the cross section of the blade 13 close to the inner wheel disk 12 is set to be smaller than the chord length corresponding to the cross section of the blade 13 close to the annular blade support 11 so as to enhance the guiding effect on the airflow.

[0051] In an optional embodiment, the ratio of the chord length of the cross section of the blade 13 on one side close to the annular blade support 11 to the outer diameter of the blade 4 is greater than a first preset threshold.

[0052] For details, please refer to Figure 5 , the outer diameter of the blade 4 is d4, the chord length corresponding to the cross section of the wing blade 13 on the side close to the annular wing blade support 11 is m2, the first preset threshold value can be 0.06, that is, the chord length m2 corresponding to the cross section of the wing blade 13 at the B end is greater than 0.06 times the outer diameter d4 of the blade 4. In another specific embodiment, the ratio of the chord length m1 corresponding to the cross section of the wing blade 13 on the side close to the inner wheel disk 12 to the outer diameter of the blade 4 is greater than the second preset threshold value, wherein the second preset threshold value can be 0.055, that is, the chord length m1 corresponding to the cross section of the wing blade 13 at the A end is greater than 0.055 times the outer diameter d4 of the blade 4.

[0053] It should be noted that the inner diameter d3 of the blade 4, the inner diameter d1 of the wing blade 13, and the outer diameter d2 of the wing blade 13 satisfy the following relationship:

[0054] 0.1d3 <d3-d2<0.2d3

[0055] d1<0.5d2

[0056] In some embodiments, a stabilizing hole is provided on the inner wheel disc 12, and the multi-blade centrifugal impeller is connected to the motor shaft through the stabilizing hole on the inner wheel disc 12, so that the motor drives the multi-blade centrifugal impeller to rotate through the motor shaft. When the motor drives the multi-blade centrifugal impeller, the wing blade assembly 1 also rotates accordingly, so that the wing blade assembly 1 generates a force on the airflow in the circumferential direction to achieve a guiding effect on the airflow, thereby enhancing the working capacity of the front side of the multi-blade centrifugal impeller.

[0057] In practical applications, see Figure 3When the motor drives the multi-blade centrifugal impeller to rotate, the wing blade assembly 1 also rotates accordingly. In the circumferential direction, the air flows through the wing blade 13 in the opposite direction of rotation. The wing blade 13 generates two forces on the airflow, namely, lift Ga and resistance Gx, wherein the resistance Gx is in the same direction as the rotation direction. For the wing blade 13, the resistance Gx can make the air obtain a pre-rotation speed, so that the design margin of the inlet angle of the wing blade 13 is larger. The lift Ga can be decomposed into a first sub-lift Gaz and a second sub-lift Gay. The effect of the first sub-lift Gaz is the same as that of the axial force Fz, which can balance the inlet pressure and increase the working capacity of the front disk side of the blade 4. The effect of the second sub-lift Gay is the same as that of the radial force Fy, that is, an additional centrifugal force, which has the effect of increasing the fan flow.

[0058] In an optional embodiment, if the number of blades 4 is greater than a preset number threshold, 4-6 times the number of vanes 13 is greater than or equal to the number of blades 4 .

[0059] Specifically, the preset quantity threshold can be 36, that is, if the number of blades 4 is greater than 36, then 4-6 times the number of wing blades 13 is greater than or equal to the number of blades 4. Preferably, if the number of blades 4 is greater than 36, then 6 times the number of wing blades 13 is greater than or equal to the number of blades 4.

[0060] Further, if the number of blades 4 is less than or equal to 36, the number of wing blades 13 is greater than or equal to 5-8. Preferably, if the number of blades 4 is less than or equal to 36, the number of wing blades 13 is greater than or equal to 6.

[0061] In an optional embodiment, the wing blade assembly 1 further includes a guide wing blade 14 , one end of the guide wing blade 14 is fixed to the annular wing blade bracket 11 , and the other end of the guide wing blade 14 is bent in a direction away from the wing blade 13 .

[0062] Specifically, the number of guide blades 14 is equal to the number of blades 13. The guide blades 14 are used to guide the airflow at the inlet on the other side of the multi-blade centrifugal impeller, so as to increase the flow on the other side of the multi-blade centrifugal impeller and increase the working capacity of the rear side of the multi-blade centrifugal impeller, thereby improving the performance of the multi-blade centrifugal impeller and realizing a double-suction multi-blade centrifugal impeller. It should be noted that the air intake on both sides of the multi-blade centrifugal impeller is different, so the structure of the guide blades 14 and the blades 13 needs to be designed according to the airflow parameters of the air intake on both sides, that is, the guide blades 14 are set as follows Figure 10-13 The structure shown is used to realize a double-suction multi-blade centrifugal impeller.

[0063] The above embodiments of the present application have the following beneficial effects:

[0064] The present application arranges a plurality of wing blades between the annular wing blade bracket and the inner wheel disc, the middle of which is bent toward the direction of the first blade fixing portion, so as to guide the airflow, thereby increasing the flow rate of the multi-blade centrifugal impeller and the working capacity of the front side of the multi-blade centrifugal impeller to improve the performance of the multi-blade centrifugal impeller.

[0065] The embodiment of the present application also provides a range hood, which includes the multi-blade centrifugal impeller as described above. Since the range hood has the multi-blade centrifugal impeller as described above, the range hood in this embodiment should also have the same technical effect, which will not be repeated here.

[0066] The structure shown in this embodiment is only a partial structure related to the solution of this application, and does not constitute a limitation on the device to which the solution of this application is applied. The specific device may include more or fewer components than shown, or combine certain components, or have different arrangements of components. It should be understood that the method, device, etc. disclosed in this embodiment can be implemented in other ways.

[0067] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A multi-blade centrifugal impeller, characterized in that: The invention comprises a wing blade assembly (1), a first blade fixing portion (2) and a second blade fixing portion (3) arranged in parallel, and a blade (4) arranged between the first blade fixing portion (2) and the second blade fixing portion (3), wherein two ends of the blade (4) are respectively connected to the first blade fixing portion (2) and the second blade fixing portion (3); The wing blade assembly (1) comprises an annular wing blade bracket (11), an inner wheel disc (12), and a plurality of wing blades (13) arranged between the annular wing blade bracket (11) and the inner wheel disc (12), wherein two ends of the wing blade (13) are respectively connected to the inner edge of the annular wing blade bracket (11) and the outer edge of the inner wheel disc (12), and the wing blade (13) is a curved plate with a middle portion bent toward the direction where the first blade fixing portion (2) is located; The annular wing blade support (11) is provided with a plurality of blade fixing holes (112), the blades (4) pass through the blade fixing holes (112), and the blades (4) are arranged on the annular wing blade support (11) through the blade fixing holes (112).

2. The multi-blade centrifugal impeller according to claim 1, characterized in that: The annular wing blade support (11) is arranged in parallel with the inner wheel disc (12), and there is a preset interval between the plane where the annular wing blade support (11) is located and the plane where the inner wheel disc (12) is located.

3. The multi-blade centrifugal impeller according to claim 1, characterized in that: The bending angle of the wing blade (13) gradually decreases from the side close to the inner wheel disc (12) to the side close to the annular wing blade bracket (11), and the bending angle is the difference between the angle between the tangent direction on one side of the wing blade (13) and the vertical direction and the angle between the tangent direction on the other side of the wing blade (13) and the vertical direction.

4. The multi-blade centrifugal impeller according to claim 1, characterized in that: The chord length corresponding to the cross section of the wing blade (13) close to the inner wheel disc (12) is smaller than the chord length corresponding to the cross section of the wing blade (13) close to the annular wing blade support (11).

5. The multi-blade centrifugal impeller according to claim 1, characterized in that: The angle between the tangent direction of the wing blade (13) and the vertical direction gradually decreases from the side close to the inner wheel disc (12) to the side close to the annular wing blade bracket (11).

6. The multi-blade centrifugal impeller according to claim 1, characterized in that: The first blade fixing portion (2) and the second blade fixing portion (3) are both annular structures, and the plurality of blades (4) are arranged along the circumferential direction of the first blade fixing portion (2).

7. The multi-blade centrifugal impeller according to claim 6, characterized in that: The ratio of the chord length corresponding to the cross section of the wing blade (13) close to the side of the annular wing blade support (11) to the outer diameter of the blade (4) is greater than a first preset threshold.

8. The multi-blade centrifugal impeller according to claim 1, characterized in that: If the number of the blades (4) is greater than a preset number threshold, 4-6 times the number of the wing blades (13) is greater than or equal to the number of the blades (4).

9. The multi-blade centrifugal impeller according to claim 1, characterized in that: The wing blade assembly (1) further comprises a guide wing blade (14), one end of the guide wing blade (14) being fixed on the annular wing blade bracket (11), and the other end of the guide wing blade (14) being bent in a direction away from the wing blade (13).

10. A range hood, characterized in that: It comprises a multi-blade centrifugal impeller as described in any one of claims 1 to 9.

Images