Rearward centrifugal wind wheel, centrifugal fan and air cleaner

Abstract

The utility model discloses a kind of backward centrifugal wind wheels, centrifugal fan and air purifier, it is related to centrifugal wind wheel technical field, wherein, backward centrifugal wind wheel includes middle baffle, two blade groups and two air guide rings, middle baffle has two installation end faces opposite in first direction;Two blade groups are divided and arranged on two installation end faces, to form with air inlet side on the opposite sides of middle baffle, two blade groups are symmetric or asymmetric arrangement;Blade group includes the multiple blades of interval distribution along circumference direction;Two air guide rings are divided and arranged on the opposite sides of middle baffle along first direction, and the multiple blades of same blade group are connected to air guide ring located in same side.The technical scheme provided by the utility model can improve the aerodynamic performance and air output of backward centrifugal wind wheel.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal impeller technology, and in particular to a backward centrifugal impeller, a centrifugal fan and an air purifier. Background Technology

[0002] Backward-curved centrifugal impellers, also known as backward-inclined centrifugal impellers, are characterized by blade exit angles of less than 90°. In related technologies, the structural design of backward-curved centrifugal impellers is not optimal, resulting in poor aerodynamic performance and airflow. Utility Model Content

[0003] The main purpose of this invention is to propose a backward centrifugal impeller, a centrifugal fan, and an air purifier, which aims to improve the aerodynamic performance and air volume of the backward centrifugal impeller.

[0004] To achieve the above objectives, the present invention proposes a backward centrifugal impeller, comprising:

[0005] The partition plate has two mounting end faces opposite each other in a first direction;

[0006] Two blade groups are disposed on two mounting end faces to form air inlet sides on opposite sides of the partition plate. The two blade groups are arranged symmetrically or asymmetrically. Each blade group includes a plurality of blades spaced circumferentially, and the outlet angle β2 of each blade ranges from 50° to 65°.

[0007] Two air guide rings are disposed on opposite sides of the middle partition along the first direction, and multiple blades of the same blade group are connected to the air guide rings located on the same side.

[0008] In one embodiment, the exit angle β2 of the blade ranges from 52° to 62°.

[0009] In one embodiment, the two blade groups are arranged asymmetrically, and the two air guide rings are asymmetrical components.

[0010] In one embodiment, at least one blade of the blade group is integrally formed with the diaphragm.

[0011] In one embodiment, the blade and the diaphragm are integrally injection molded.

[0012] In one embodiment, the blade includes a first plate portion and a second plate portion connected to each other, the second plate portion being connected to the side edge of the first plate portion away from the axis of the backward centrifugal impeller, and the lateral thickness of the first plate portion gradually increasing in the direction from the first plate portion toward the second plate portion.

[0013] In one embodiment, the lateral thickness of the second plate portion is gradually reduced in the direction from the first plate portion toward the second plate portion.

[0014] In one embodiment, the surfaces of the first plate portion and / or the second plate portion are planar.

[0015] In one embodiment, the first plate portion and the second plate portion are arranged to intersect at an obtuse angle, and the side containing the obtuse angle is arranged close to the axis of the backward centrifugal impeller.

[0016] In one embodiment, the blades and the air guide ring are fixed together by welding.

[0017] In one embodiment, the blade and the air guide ring are fixed together by ultrasonic welding.

[0018] In one embodiment, the inner circumferential surface of the air guide ring is provided with a positioning groove corresponding to the blade, and the side edge of the blade away from the middle partition is inserted into the positioning groove; or, the inner circumferential surface of the air guide ring is provided with a positioning hole corresponding to the blade, and the side edge of the blade away from the middle partition is provided with a positioning post, and the positioning post is inserted into the positioning groove.

[0019] In one embodiment, the air guide ring includes an axial ring segment, a radial ring segment, and a transition ring segment. The transition ring segment connects the axial ring segment and the radial ring segment. The radial ring segment surrounds the outer periphery of the axial ring segment and is disposed close to the central partition.

[0020] In one embodiment, the blade includes at least two connected plate segments, the at least two plate segments including a first plate segment and a second plate segment sequentially distributed in a direction away from the center of the diaphragm, the second plate segment connecting the radial ring segment and the transition ring segment, the first plate segment connecting the axial ring segment, the first plate segment being axially lower than the axial ring segment, and the first plate segment extending beyond the axial ring segment in a direction close to the center of the diaphragm.

[0021] This utility model also proposes a centrifugal fan, including a drive component and the aforementioned centrifugal impeller, wherein the centrifugal impeller is driven and connected to the drive component.

[0022] This utility model also proposes an air purifier, including the aforementioned centrifugal fan.

[0023] The technical solution of this utility model, on the one hand, achieves dual-sided air intake for the backward centrifugal impeller by forming air inlet sides on both axial sides of the impeller, i.e., within the inner circumferential space of both guide rings. This allows for higher aerodynamic performance and air volume while maintaining the same outer contour dimensions and volume of the impeller. On the other hand, by setting the outlet angle β2 of the blades to a range of 50° to 65°, the aerodynamic performance and air volume of the backward centrifugal impeller can be further improved. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 A schematic diagram of a backward centrifugal impeller according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 The illustrated embodiment is shown in the front view after the air guide ring has been hidden.

[0027] Figure 3 for Figure 2 A structural diagram of the structure shown;

[0028] Figure 4 for Figure 1 A schematic diagram of the structure of a guide ring in the middle.

[0029] Explanation of icon numbers:

[0030] 100. Middle partition; 101. Mounting end face;

[0031] 200. Blade; 201. First plate segment; 202. Second plate segment; 210. First plate section; 220. Second plate section;

[0032] 300, air guide ring; 301, positioning groove; 310, axial ring section; 320, transition ring section; 330, radial ring section.

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0035] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] This utility model proposes a backward centrifugal impeller.

[0038] Please see Figures 1 to 4 In one embodiment of the present invention, the backward centrifugal impeller includes a central partition 100, two blade groups, and two air guide rings 300. The central partition 100 has two mounting end faces 101 facing each other in a first direction (i.e., the axial direction of the backward centrifugal impeller). The two blade groups are disposed on the two mounting end faces 101 so that air inlet sides are formed on both sides of the central partition 100. The two blade groups are arranged symmetrically or asymmetrically. The blade groups include a plurality of blades 200 distributed circumferentially. The two air guide rings 300 are disposed on both sides of the central partition 100 along the first direction. The plurality of blades 200 of the same blade group are connected to the air guide rings 300 located on the same side.

[0039] Specifically, by forming air inlet sides on both axial sides of the backward centrifugal impeller, that is, in the inner circumferential space of the two air guide rings 300, the backward centrifugal impeller can achieve double-sided air intake, thereby achieving higher aerodynamic performance and air volume under the condition that the outer contour size and volume of the impeller are equal.

[0040] Please see Figure 2 Optionally, the outlet angle β2 of the blade 200 ranges from 50° to 65°. In this embodiment, it can be further set to 52° to 62°, for example, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, 61°, or 62°. This further improves the aerodynamic performance and airflow of the backward centrifugal impeller. It is understood that if the outlet angle β2 is too large, it will lead to low total pressure and large separation loss; if it is too small, it will lead to reduced airflow and increased pressure head and energy consumption.

[0041] Optionally, the two blade groups are asymmetrically arranged, and the two guide rings 300 are asymmetrical components. Specifically, the blades 200 of the two blade groups may have similar structures but different distribution positions; that is, when all the blades 200 of the two blade groups are projected orthographically toward the partition plate 100, the projected shapes of all the blades 200 are circumferentially spaced. Of course, in other embodiments, the structure and size of the blades 200 may be different; for example, the height at which the blades 200 protrude from the partition plate 100 may be different. In other embodiments, the blade groups may be symmetrically arranged.

[0042] In this embodiment, the blades 200 of the two blade groups have similar structures but different distribution positions, resulting in the two air guide rings 300 being asymmetrically arranged.

[0043] Optionally, at least one blade group's blades 200 are integrally formed with the partition plate 100. This simplifies the structure and saves assembly steps and time, thereby improving the production efficiency of the backward centrifugal impeller. Of course, in other embodiments, the blades 200 and the partition plate 100 can also be formed separately.

[0044] Please see Figure 3 In this embodiment, all blades 200 of the two blade groups are integrally formed with the partition plate 100.

[0045] Optionally, the blades 200 and the partition plate 100 are integrally injection molded. This facilitates the lightweight design of the backward centrifugal impeller and makes its manufacturing easier. Of course, in other embodiments, the blades 200 and the partition plate 100 can also be integrally molded using processes such as casting or 3D printing.

[0046] Optionally, the blade 200 includes a first plate portion 210 and a second plate portion 220 connected to each other. The second plate portion 220 is connected to the side edge of the first plate portion 210 away from the axis of the backward centrifugal impeller. The lateral thickness of the first plate portion 210 gradually increases in the direction from the first plate portion 210 to the second plate portion 220. This facilitates the radial flow of air into the air outlet channel spaced between adjacent blades 200, thereby improving the smoothness of airflow and reducing aerodynamic noise. Of course, in other embodiments, the lateral thickness of the first plate portion 210 may gradually decrease or remain constant in the direction from the first plate portion 210 to the second plate portion 220.

[0047] Optionally, the lateral thickness of the second plate portion 220 gradually decreases in the direction from the first plate portion 210 to the second plate portion 220. This facilitates the radial flow of air through the air outlet channel spaced between adjacent blades 200, thereby improving the smoothness of airflow and reducing aerodynamic noise. Of course, in other embodiments, the lateral thickness of the first plate portion 210 may gradually decrease or remain constant in the direction from the first plate portion 210 to the second plate portion 220.

[0048] Optionally, both the first plate portion 210 and the second plate portion 220 have planar surfaces. This helps to improve the degree of air separation from the surfaces of the first plate portion 210 and the second plate portion 220, thereby reducing aerodynamic noise. Secondly, it facilitates the integral injection molding of the blade 200 and the partition plate 100. Of course, in other embodiments, only one of the first plate portion 210 and the second plate portion 220 may be planar, while the other may be curved, or both may be curved.

[0049] Optionally, the first plate portion 210 and the second plate portion 220 intersect at an obtuse angle, with the side containing the obtuse angle positioned close to the axis of the rearward centrifugal impeller. Specifically, the obtuse angle between the first plate portion 210 and the second plate portion 220 can be close to 180°, for example, a value between 170° and 179°, or other values, such as 150° to 169°. In this embodiment, the obtuse angle between the first plate portion 210 and the second plate portion 220 is between 170° and 179°, so that the blade 200 is generally arranged in a straight plate shape, which is beneficial for reducing the generation of vortices and aerodynamic noise, and also facilitates the manufacturing and forming of the blade 200.

[0050] Optionally, the blade 200 and the air guide ring 300 are fixed together by welding. This simplifies the assembly process and time of the blade 200 and the air guide ring 300, and improves the connection strength and reliability of the blade 200 and the air guide ring 300. Of course, in other embodiments, the blade 200 and the air guide ring 300 can also be connected by means of snap-fit ​​structure, screws, rivets or adhesives.

[0051] Optionally, the blade 200 and the guide ring 300 are fixed together by ultrasonic welding. This results in a simple and easy-to-implement structure. Of course, in other embodiments, hot plate welding, laser welding, or other methods can also be used to weld and fix the blade 200 and the guide ring 300.

[0052] Please see Figure 4 Optionally, the inner circumference of the guide ring 300 is provided with a positioning groove 301 corresponding to the blade 200, and the side edge of the blade 200 away from the middle partition 100 is inserted into the positioning groove 301. In this way, the positioning groove 301 can play a role in pre-positioning and pre-constraining the blade 200, so as to facilitate subsequent ultrasonic welding operations. The side wall of the positioning groove 301 and the side edge of the blade 200 can be fused together under the action of the ultrasonic welding equipment.

[0053] In other embodiments, the inner circumferential surface of the air guide ring 300 is provided with positioning holes corresponding to the blade 200, and the side edge of the blade 200 away from the middle partition 100 is provided with positioning posts, which are inserted into the positioning groove 301. In this way, the air guide ring 300 can also achieve the function of pre-positioning and pre-constraining the blade 200.

[0054] Please see Figure 1 and Figure 4 Optionally, the air guide ring 300 includes an axial ring segment 310, a radial ring segment 330, and a transition ring segment 320. The transition ring segment 320 connects the axial ring segment 310 and the radial ring segment 330. The radial ring segment 330 surrounds the outer periphery of the axial ring segment 310 and is located close to the central partition 100. In this way, it can effectively guide and direct the airflow, allowing the air to flow more smoothly into the rearward centrifugal impeller along the axial direction.

[0055] Please refer to the following: Figure 3 Optionally, the blade 200 includes at least two connected plate segments, each including a first plate segment 201 and a second plate segment 202 sequentially distributed along a direction away from the center of the partition 100. The second plate segment 202 connects the radial ring segment 330 and the transition ring segment 320. The first plate segment 201 connects to the axial ring segment 310. The first plate segment 201 is axially lower than the axial ring segment 310 and extends beyond the axial ring segment 310 along a direction close to the center of the partition 100. Thus, by cooperating with the guide ring 300, the aerodynamic performance of the backward centrifugal impeller can be further improved. Of course, in other embodiments, the first plate segment 201 may be axially level with the axial ring segment 310, or the first plate segment 201 may be omitted, and only the second plate segment 202 connected to the radial ring segment 330 and the transition ring segment 320 may be provided.

[0056] It should be noted that you should refer to [link / reference]. Figure 3 In this embodiment, the boundary line between the first plate portion 210 and the second plate portion 220 is not the same as the boundary line between the first plate segment 201 and the second plate segment 202, and the former's boundary line is closer to the axis of the backward centrifugal impeller. That is, the second plate portion 220 is simultaneously connected to the radial ring segment 330, the transition ring segment 320, and the axial ring segment 310. In this way, the second plate portion 220 can be connected to the air guide ring 300 through its area with a larger lateral thickness, which is beneficial to improving the connection strength between the two.

[0057] This utility model also proposes a centrifugal fan, which includes a drive component and a backward centrifugal impeller. The specific structure of the backward centrifugal impeller is as described in the above embodiments. Since this centrifugal fan adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The centrifugal impeller is driven and connected to the drive component.

[0058] Alternatively, the drive unit can be an electric motor, pneumatic motor, or hydraulic motor, etc. Secondly, the output end of the drive unit can be connected to the partition plate via fasteners.

[0059] This utility model also proposes an air purifier, which includes a centrifugal fan. The centrifugal fan includes a drive component and a backward centrifugal impeller. The specific structure of the backward centrifugal impeller is as described in the above embodiments. Since this air purifier adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0060] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A backward centrifugal impeller, characterized in that, include: The partition plate has two mounting end faces opposite each other in a first direction; Two blade groups are disposed on two mounting end faces to form air inlet sides on opposite sides of the partition plate. The two blade groups are arranged symmetrically or asymmetrically. Each blade group includes a plurality of blades spaced circumferentially, and the outlet angle β2 of each blade ranges from 50° to 65°. Two air guide rings are disposed on opposite sides of the middle partition along the first direction, and multiple blades of the same blade group are connected to the air guide rings located on the same side.

2. The backward centrifugal impeller as described in claim 1, characterized in that, The exit angle β2 of the blade ranges from 52° to 62°; And / or, the two blade groups are arranged asymmetrically, and the two air guide rings are asymmetrical components.

3. The backward centrifugal impeller as described in claim 1, characterized in that, At least one blade of the blade group is integrally formed with the diaphragm.

4. The backward centrifugal impeller as described in claim 3, characterized in that, The blade and the diaphragm are integrally injection molded; And / or, the blade includes a first plate portion and a second plate portion connected together, the second plate portion being connected to the side edge of the first plate portion away from the axis of the backward centrifugal impeller, the lateral thickness of the first plate portion gradually increasing and the lateral thickness of the second plate portion gradually decreasing in the direction from the first plate portion toward the second plate portion; the plate surfaces of the first plate portion and / or the second plate portion are planar, and / or, the first plate portion and the second plate portion intersect at an obtuse angle, and the side containing the obtuse angle is close to the axis of the backward centrifugal impeller.

5. The backward centrifugal impeller as described in claim 3, characterized in that, The blades and the air guide ring are fixed together by welding.

6. The backward centrifugal impeller as described in claim 5, characterized in that, The blades and the air guide ring are fixed together by ultrasonic welding. And / or, the inner circumferential surface of the air guide ring is provided with a positioning groove corresponding to the blade, and the side edge of the blade away from the middle partition is inserted into the positioning groove; or, the inner circumferential surface of the air guide ring is provided with a positioning hole corresponding to the blade, and the side edge of the blade away from the middle partition is provided with a positioning post, and the positioning post is inserted into the positioning groove.

7. The backward centrifugal impeller as described in claim 1, characterized in that, The air guide ring includes an axial ring segment, a radial ring segment, and a transition ring segment. The transition ring segment connects the axial ring segment and the radial ring segment. The radial ring segment surrounds the outer periphery of the axial ring segment and is located close to the middle partition.

8. The backward centrifugal impeller as described in claim 7, characterized in that, The blade includes at least two connected plate segments, each including a first plate segment and a second plate segment distributed sequentially in a direction away from the center of the diaphragm. The second plate segment connects the radial ring segment and the transition ring segment. The first plate segment connects the axial ring segment. The first plate segment is axially lower than the axial ring segment and extends beyond the axial ring segment in a direction close to the center of the diaphragm.

9. A centrifugal fan, characterized in that, include: Drive components; as well as The centrifugal impeller as described in any one of claims 1 to 8, wherein the centrifugal impeller is driven and connected to the driving member.

10. An air purifier, characterized in that, Including the centrifugal fan as described in claim 9.

Images