Cross-flow fan blade and cross-flow fan with same

Abstract

The invention provides a cross-flow fan blade and a cross-flow fan with the cross-flow fan blade, the cross-flow fan blade comprises a plurality of middle-section fan blades which are connected in sequence, and each middle-section fan blade comprises a disc, a connecting structure and a plurality of blades; each blade is provided with a first end and a second end, the first ends are connected with the disc, the second ends extend in the axial direction of the disc, the second ends of the adjacent blades are connected through a connecting structure, the end face, away from the disc, of the connecting structure is a first end face, and the first end face is connected with the disc of the adjacent middle-section fan blade. The first end face of the first middle-section fan blade is connected with the annular groove of the second middle-section fan blade, and the blade of the first middle-section fan blade is connected with the blade groove of the second middle-section fan blade. The connecting structures are arranged at the second ends of the blades, so that the connecting strength between the blades can be enhanced, the whole fan blade is more stable in the operation process, and the phenomenon that the whole fan blade is prone to deformation in the placement process is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of crossflow blades, and in particular relates to a crossflow blade and a crossflow fan having the crossflow blade. Background Art

[0002] The crossflow fan blades include three structural parts: the middle section fan blades, the end covers and the shaft covers. During the processing and production of the crossflow fan blades, multiple middle section fan blades are gradually welded by ultrasonic waves. The middle section fan blades include a disc and multiple blades that are unevenly distributed on one side of the disc. The ends of each blade are open and independently distributed. During production, the ends of the blades are prone to material shortages. When the middle section fan blades are packed and placed, the ends of the blades are easily damaged by collisions, resulting in the loss and waste of the blades. Secondly, the open blades are very easy to deform during placement. When welding, the contact surface between the blades and the disc is too small. During the welding process of the two middle section fan blades, it is very easy to produce cold welding, resulting in loose welding, which can cause the fan blades to break after sale. Summary of the invention

[0003] The present invention provides a crossflow fan blade and a crossflow fan having the same, which can solve the technical problem that the contact surface between the blade and the disc of the existing middle-section fan blade is too small during welding, and cold welding is very likely to occur during the welding process of two middle-section fan blades, resulting in loose welding.

[0004] The present invention provides a crossflow fan blade, comprising at least two middle-node fan blades connected in sequence, wherein the middle-node fan blade comprises a disk, a connection structure and a plurality of blades;

[0005] The blade has a first end and a second end, the first end is connected to the disk, the second end extends in the axial direction of the disk, the second ends of adjacent blades are respectively connected by the connecting structure, and the end surface of the connecting structure facing away from the blade is the first end surface;

[0006] The end face of the disk facing away from the blade is the second end face, and an annular groove and a plurality of blade grooves arranged at intervals are arranged on the second end face. Taking the cross section of the disk as the projection surface, the annular groove is arranged on the outer edge of the disk, and the plurality of blade grooves are located radially inside the annular groove. The first end face of the first middle-section wind blade is respectively connected to the annular groove of the second middle-section wind blade, and the blades of the first middle-section wind blade are respectively connected to the blade grooves of the second middle-section wind blade.

[0007] In some embodiments, the blade includes a blade tip segment and a blade root segment connected to each other, with the cross section of the blade as a projection surface, the blade tip segment extends radially inward, and the blade root segment is connected to the connection structure.

[0008] In some embodiments, the connection structure is connected to the end of the blade root segment, and adjacent connection structures are sequentially connected to form an annular disk, and the end surface of the annular disk away from the blade is the first end surface.

[0009] In some embodiments, the end surfaces of the blade tip segments are flush with the first end surface, and the blade tip segments of the first mid-node fan blade are respectively connected to the blade grooves of the second mid-node fan blade.

[0010] In some embodiments, the connection structure is connected to the side wall of the blade root segment, the end faces of the blade root segment are flush with the first end faces, and the blade root segment of the first mid-node wind blade is respectively connected to the blade groove of the second mid-node wind blade.

[0011] In some embodiments, the end surface of the blade tip section and the end surface of the blade root section are both flush with the first end surface, and the blade tip section and blade root section of the first mid-node wind blade are respectively connected to the blade groove of the second mid-node wind blade.

[0012] In some embodiments, taking the cross section of the disk as a projection surface, one end of the blade groove extends radially inward, and the other end of the blade groove is provided with an opening, and the opening is communicated with the annular groove.

[0013] In some embodiments, a first annular rib is provided in the annular groove, and the first end face of the first middle-node fan blade is respectively abutted against the first rib; second ribs are respectively provided in the plurality of blade grooves, and the blades of the first middle-node fan blade are respectively abutted against the second ribs.

[0014] In some embodiments, a first connecting rib is provided at the connection between one side of the blade and the corresponding connecting structure, and a second connecting rib is provided at the connection between the other side of the blade and the corresponding connecting structure; a first transition zone and a second transition zone are respectively provided at the connection between the two sides of the opening and the annular groove, the first connecting rib of the first middle-section wind blade is connected to the first transition zone of the second middle-section wind blade, and the second connecting rib of the first middle-section wind blade is connected to the second transition zone of the second middle-section wind blade.

[0015] In some embodiments, taking the cross section of the first end as the projection surface, in the radial direction, the outer diameter of the annular disk is D2, the circle corresponding to the largest point of the end of the root segment is the first circle, the circle corresponding to the end of the tip segment extending radially inward is the second circle, the diameter of the first circle is D3, the diameter of the second circle is D4, and the outer diameter D2, the diameter D3 and the diameter D4 satisfy: D2-D3<(D2-D4) / 3.

[0016] A crossflow fan comprises a crossflow blade, wherein the crossflow blade is the crossflow blade described above.

[0017] A crossflow fan blade and a crossflow fan having the crossflow fan blade provided by the present invention have the following beneficial effects:

[0018] The present invention can enhance the connection strength between the blades by arranging a connection structure at the second end of the blade, so that the entire fan blade is more stable during operation, and the damage caused by blade vibration or deformation is reduced, thereby improving the durability and reliability of the fan blade. The open blade is easy to deform during placement, and the connection structure can effectively prevent the blade from deforming during welding and use, ensuring that the blade maintains its designed shape, thereby maintaining the aerodynamic performance of the fan blade. The setting of the connection structure increases the contact area between the blade and the disc, increases the fusion area during welding, helps to improve the quality of ultrasonic welding, and reduces the possibility of cold welding, thereby improving the firmness and service life of the fan blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] Figure 1 It is a schematic diagram of a middle-section wind blade in the prior art;

[0021] Figure 2 is a schematic diagram of a disc in the prior art;

[0022] Figure 3 A schematic diagram of a middle section wind blade according to an embodiment of the present invention;

[0023] Figure 4 A side view of a middle section fan blade according to an embodiment of the present invention;

[0024] Figure 5 for Figure 4 Schematic diagram of the AA position in the middle;

[0025] Figure 6 for Figure 4 Schematic diagram of the middle BB;

[0026] Figure 7 for Figure 6 Schematic diagram at H in the middle;

[0027] Figure 8 for Figure 4 Schematic diagram at CC in the middle;

[0028] Fig. 9 for Figure 8 Schematic diagram at I in the middle;

[0029] Fig.10 A top view of a disc according to an embodiment of the present invention;

[0030] Fig.11 It is a schematic diagram of the installation direction of the middle section blade and the adjacent intermediate blade;

[0031] Fig.12 is a schematic diagram of a crossflow fan blade;

[0032] Figures: 1-disc; 11-second end face; 101-annular groove; 111-first rib; 102-blade groove; 121-opening; 122-second rib; 103-first transition zone; 104-second transition zone; 2-blade; 21-first end; 22-second end; 201-tip section; 202-root section; 203-first connecting rib; 204-second connecting rib; 3-connecting structure; 31-first end face; 4-middle section blade; 6-end cover. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0035] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0036] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0037] See also Figure 3 As shown, according to an embodiment of the present invention, a crossflow fan blade is provided, comprising at least two middle-section fan blades 4 connected in sequence, the middle-section fan blade 4 comprising a disc 1, a connecting structure 3 and a plurality of blades 2; the blade 2 has a first end 21 and a second end 22, the first end 21 is connected to the disc 1, and the second end 22 extends in the axial direction of the disc 1, and the second ends 22 of adjacent blades 2 are respectively connected by the connecting structure 3, and the end surface of the connecting structure 3 facing away from the blade 2 is the first end surface 31; the end surface of the disc 1 facing away from the blade 2 is the second end surface 11, and an annular groove 101 and a plurality of blade grooves 102 arranged at intervals are arranged on the second end surface 11, with the cross section of the disc 1 as the projection surface, the outer edge of the disc 1 is provided with an annular groove 101, and the plurality of blade grooves 102 are located on the radial inner side of the annular groove 101, the first end surface 31 of the first middle-section fan blade 4 is respectively connected to the annular groove 101 of the second middle-section fan blade 4, and the blades 2 of the first middle-section fan blade 4 are respectively connected to the blade grooves 102 of the second middle-section fan blade 4.

[0038] Specifically, Figure 1 and Figure 2As shown, the existing disc 1 is also connected to the disc 1 by the first ends 21 of the plurality of blades 2. Since the other ends of the plurality of blades 2 extend in the axial direction of the disc 1, the plurality of blades 2 are arranged circumferentially at intervals along the axis of the disc 1, and the plurality of blades 2 have a certain length, and the blades 2 are adjacent to each other and have a certain distance. However, in the prior art, only blade grooves 102 are provided on the disc 1, and the blades 2 are directly connected to the blade grooves 102. In this embodiment, the second ends 22 of the adjacent blades 2 are connected by a connecting structure 3, one end of the connecting structure 3 is connected to the second end 22 of a blade 2, and the other end of the connecting structure 3 is connected to the second end 22 of another blade 2, that is, the adjacent blades 2 are connected by the connecting structure 3, and the middle section wind blade 4 at this time is a whole to be connected to the disc 1 of the adjacent middle section wind blade 4, and the connecting structure 3 is connected to the disc 1 of the adjacent middle section wind blade 4. During installation, first align and connect the 2 of the first middle-section fan blade 4 with the blade groove 102 of the second middle-section fan blade 4, and synchronously connect the first end face 31 of the first middle-section fan blade 4 with the annular groove 101 of the second middle-section fan blade 4, so that the connecting structure 3 is embedded in the annular groove 101. At this time, the first end face 31 is connected to the bottom wall of the annular groove 101, and the side wall of the connecting structure 3 is connected to the side wall of the annular groove 101.

[0039] In this embodiment, by providing a connection structure 3 at the second end 22 of the blade 2, the connection strength between the blades 2 can be enhanced, making the entire blade more stable during operation, reducing damage caused by vibration or deformation of the blade 2, and improving the durability and reliability of the blade. The open blade 2 is easily deformed during placement, and the connection structure 3 can effectively prevent the blade 2 from deforming during welding and use, ensuring that the blade 2 maintains its designed shape, thereby maintaining the aerodynamic performance of the blade. The provision of the connection structure 3 increases the contact area between the middle-section blade 4 and the disc 1 of the adjacent middle-section blade 4, increases the fusion area during welding, helps to improve the quality of ultrasonic welding, and reduces the possibility of cold welding, thereby improving the firmness and service life of the blade.

[0040] In addition, in this embodiment, an annular groove 101 and a blade groove 102 are simultaneously provided on the second end face 11, so that when the blade 2 of the first middle-section fan blade 4 is installed in the blade groove 102, the first end face 31 of the connecting structure 3 is also installed in the annular groove 101, so that the blade 2 of the first middle-section fan blade 4 and the connecting structure 3 are both connected to the disc 1 of the second middle-section fan blade 4, that is, the connection area between the first middle-section fan blade 4 and the second middle-section fan blade 4 is increased as a whole, thereby improving the stability and strength of the connection, and the blade groove 102 is located on the radial inner side of the annular groove 101, which is equivalent to limiting the blade 2 in the radial direction after the connecting structure 3 is connected to the annular groove 101, to prevent deformation in the radial direction after installation.

[0041] It is worth mentioning that the multiple middle-section fan blades 4 in this embodiment are to be connected in sequence. The second middle-section fan blade 4 here refers to the middle-section fan blade 4 that needs to be connected to the previous middle-section fan blade 4. The previous middle-section fan blade 4 is also the first middle-section fan blade 4. Similarly, the connection method of this embodiment is adopted between two adjacent middle-section fan blades 4.

[0042] As a specific implementation method, the blade 2 and the connecting structure 3 are integrally formed, specifically, integrally injection molded. The end of the blade 2 close to the periphery is no longer exposed to the outside to avoid collision with other parts. At the same time, a connecting structure 3 is provided at the end of the blade 2. During production, the material of the entire middle-section wind blade 4 is evenly distributed and the pressure is even, which greatly reduces the possibility of deformation.

[0043] See also Figures 4 to 9 As shown, the blade 2 includes a blade tip section 201 and a blade root section 202 which are connected to each other. Taking the cross section of the blade 2 as the projection surface, the blade tip section 201 extends radially inward, and the blade root section 202 is connected to the connection structure 3 .

[0044] Specifically, taking the cross section of the second end 22 of the blade 2 as the projection plane, each blade 2 is inclined at a certain angle, and the blade 2 includes a blade root segment 202 and a blade tip segment 201, the blade tip segment 201 extends radially inward, and adjacent blade root segments 202 are connected by a connecting structure 3.

[0045] In this embodiment, the blade root section 202 is a key part for connecting the blade 2 with the hub. By providing the connection structure 3 at the blade root section 202, the connection strength and stability between the blade 2 and the hub can be significantly improved. This arrangement helps to disperse various forces, such as aerodynamic force, centrifugal force, etc., that the blade 2 is subjected to during operation. During the ultrasonic welding process, the connection between the blade root section 202 and the connection structure 3 can provide a larger contact area, which helps to improve the welding quality and reduce the possibility of cold welding, thereby improving the firmness and service life of the wind blade.

[0046] According to the structural characteristics of the blade 2, the existing blade 2 is usually connected to the disk 1 at only one end, and the other end has no fixed structure. In this embodiment, a connecting structure 3 is provided at the second end 22 of the blade 2. The blade 2 includes a tip section 201 and a root section 202. The connecting structure 3 can be connected to the end face of the root section 202 or only to the side wall of the root section 202.

[0047] See also Figures 4 to 9 As shown, the connection structure 3 is connected to the end of the blade root segment 202 , and adjacent connection structures 3 are connected in sequence to form an annular disk, and the end surface of the annular disk facing away from the blade 2 is a first end surface 31 .

[0048] In this embodiment, the connecting structure 3 is connected to the end of the blade root segment 202, that is, the blade root segment 202 does not protrude from the connecting structure 3, so that the connecting structures 3 can be connected end to end in sequence to form an annular disk, so that when the connecting structure 3 is connected to the annular groove 101 of the second middle-section fan blade 4, it is connected to the annular groove 101 as a whole, which can not only improve the overall connection strength of the first middle-section fan blade 4, but also improve the connection strength between the first middle-section fan blade 4 and the second middle-section fan blade 4.

[0049] See also Figures 4 to 9 As shown, the end faces of the blade tip section 201 are flush with the first end face 31, and the blade tip section 201 of the first middle-node fan blade 4 is respectively connected to the blade groove 102 of the second middle-node fan blade 4. Specifically, the connecting structure 3 is connected to the end of the blade root section 202, and the two ends of the connecting structure 3 are sequentially connected end to end to form an annular disk, and the end of the blade tip section 201 extends a certain length toward the first end face 31, so that the blade tip section 201 is flush with the first end face 31, and when the middle-node fan blade 4 is connected to the adjacent middle-node fan blade 4, the blade tip section 201 and the first end face 31 are both connected to the disk 1 of the adjacent middle-node fan blade 4.

[0050] In this embodiment, by setting a connecting structure 3 at the blade root section 202, and connecting the connecting structures 3 in sequence to form an annular disk, the rigidity and strength of the entire wind blade structure can be significantly improved. By forming the connecting structure 3 into an annular disk, better support and connection can be provided, making the entire structure more stable and firm, which helps to disperse the various forces on the blade 2 during operation, reduce the deformation and damage risks of the blade 2, and avoid the problem that the end of the blade 2 is easily damaged by collision when it is packed and placed. In addition, the first end 21 of the blade 2 is connected to the disk 1, and the second end 22 of the blade 2 is connected to the annular disk. The contact area between the annular disk and the adjacent middle-section wind blade 4 disk 1 is larger, forming a more stable structure, which helps to reduce the vibration of the blade 2 during operation, because the connecting structure 3 can absorb part of the vibration energy and reduce the impact of vibration on the blade 2 and the entire fan system. When installing the middle-section wind blade 4, the end of the blade 2 and the connecting structure 3 are both installed in the disk 1 of the adjacent middle-section wind blade 4 in the form of surface contact. This surface contact method can provide a larger contact area, thereby improving the stability and strength of the connection.

[0051] As a specific implementation method, the outer wall of the blade root section 202 is located inside the annular disk, and the annular disk has a certain width and thickness, which can provide a large supporting force. The thickness of the annular disk is equivalent to the thickness of the blade root section 202 that is reduced compared to the blade tip section 201, so as to ensure that the connection structure 3 is connected to the end of the blade root section 202, while the length of the blade tip section 201 is not reduced. Compared with directly sleeved annular disks on the outer wall of the blade 2, this arrangement of the present embodiment, even if the connection structure 3 is provided, will not apply external force to the blade 2 in the radial direction, and it is not easy to deform the blade 2, and the length of the blade 2 is not reduced as a whole, ensuring that the connection structure 3 and the blade tip section 201 can be connected to the disk 1 of the adjacent middle section wind blade 4.

[0052] See also Figures 4 to 9 As shown, the connection structure 3 is connected to the side wall of the blade root section 202, the end faces of the blade root section 202 are flush with the first end face 31, and the end faces of the blade root section 202 of the first mid-node wind blade 4 are respectively connected to the blade groove 102 of the second mid-node wind blade 4.

[0053] In this embodiment, the blade root segment 202 of the first middle-node fan blade 4 is connected to the blade groove 102 of the second middle-node fan blade 4, and the connecting structure 3 of the first middle-node fan blade 4 is connected to the annular groove 101 of the second middle-node fan blade 4. In this way, the connecting structure 3 plays the role of connecting adjacent blade root segments 202.

[0054] See also Figures 4 to 9 As shown, the end surface of the blade tip section 201 and the end surface of the blade root section 202 are both flush with the first end surface 31, and the blade tip section 201 and the blade root section 202 of the first mid-node wind blade 4 are respectively connected to the blade groove 102 of the second mid-node wind blade 4.

[0055] Specifically, the connecting structure 3 is connected to the side wall of the blade root segment 202, and the connecting structure 3 connects the two blade root segments 202, and the end face of the blade tip segment 201, the end face of the blade root segment 202 and the first end face 31 are located in the same plane, that is, not only the blade root segment 202 can be connected to the blade groove 102, but the end face of the blade tip segment 201 is also flush with the first end face 31, and when the mid-node wind blade 4 is connected to the disk 1 of the adjacent mid-node wind blade 4, the blade root segment 202, the blade tip segment 201 and the connecting structure 3 are all connected to the disk 1.

[0056] In this embodiment, the connection structure 3 is connected to the side wall of the blade root segment 202, that is, the axial length of the blade root segment 202 remains unchanged. The connection structure 3 is connected to the side wall of the blade root segment 202, which can also enhance the connection strength between the blades 2.

[0057] It is worth noting that the figure only shows that the connection structure 3 forms an annular disk. In actual application, no matter whether the connection structure 3 is connected to the end face of the blade root segment 202 or the side wall of the blade root segment 202, the connection structure 3 plays a role in strengthening the connection strength of the blade 2, making the blade 2 more firmly connected as a whole. A single connection structure 3 can be not only fan-shaped, but also deformed in other shapes. In this embodiment, the connection structure 3 is preferably connected to the end of the blade root segment 202, and the connection structure 3 forms an annular disk. Correspondingly, an annular groove 101 is set on the disk 1, so that the annular disk is connected to the annular groove 101. This setting can increase the contact area.

[0058] As a specific implementation, by providing an annular groove 101 on the second end face 11 of the disk 1, the connecting structure 3 of the adjacent middle-section wind blades 4 is embedded therein, so that the connection stability and strength between the wind blades can be improved. In addition, since the groove 101 is provided on the second end face 11, the second end face 11 forms a boss, and the annular groove 101 has a certain depth, the end faces of the blade 2 and the connecting structure 3 are both located on the inner side of the annular groove 101, which can prevent the welding sol from overflowing from the annular groove 101, ensuring that the end face and the groove are fully welded, and it is not easy to have a cold weld.

[0059] See also Figure 6 , 7 As shown in FIG. 10 , taking the cross section of the disk 1 as the projection surface, one end of the blade groove 102 extends radially inward, and the other end of the blade groove 102 is provided with an opening 121 , which is connected to the annular groove 101 , and the blade groove 102 is used to connect with the blade 2 of the adjacent middle-section wind blade 4 .

[0060] Specifically, in addition to the connection structure 3 being connected to the annular groove 101, the disc 1 is also provided with a blade groove 102, and the blade 2 can also be connected to the blade groove 102. Since the connection structure 3 is connected to the blade 2, when installing the mid-section wind blade 4, the blade 2 is first aligned with the blade groove 102, and then the connection structure 3 is installed in the annular groove 101. At this time, the end of the blade 2 and the connection structure 3 are installed in the disc 1 of the adjacent mid-section wind blade 4 in a surface contact form.

[0061] In this embodiment, one end of the blade groove 102 extends toward the center of the disk 1 in the radial direction, and the other end is provided with an opening 121, which is connected to the annular groove 101. This arrangement allows the blade groove 102 to be connected to the blade 2 of the adjacent middle-section wind blade 4, thereby realizing a directional connection between the blades 2. Considering that the blade 2 and the connecting structure 3 are integrally formed, in order to avoid interference between the grooves, the blade groove 102 has an opening 121, which serves to connect the blade groove 102 and the annular groove 101, so that the end face of the blade 2 and the end face of the connecting structure 3 can fully contact the corresponding groove. When installing the middle-section wind blade 4, the end of the blade 2 and the connecting structure 3 are both installed in the disk 1 of the adjacent middle-section wind blade 4 in the form of surface contact. This surface contact method can provide a larger contact area, thereby improving the stability and strength of the connection.

[0062] As a specific implementation, the disc 1 and the blade 2 are integrally formed, the total length of the middle section blade 4 is H0, the length of the blade 2 is H1, the thickness of the disc 1 is h2, the depth of the annular groove 101 in the disc 1 is h1, the thickness of the disc 12 is h1, and the thickness of the connecting structure 3 is also h1, so that when the connecting structure 3 of the first middle section blade 4 is connected to the disc 1 of the second middle section blade 4, the connecting structure 3 is embedded in the disc 1 as a whole, increasing the welding area and welding firmness.

[0063] See also Figure 6 , 7 As shown in FIG. 10 , a first annular rib 111 is provided in the annular groove 101, and the first end surface 31 of the first middle-node fan blade 4 is respectively abutted against the first rib 111; second ribs 122 are respectively provided in the plurality of blade grooves 102, and the blades 2 of the first middle-node fan blade 4 are respectively abutted against the second ribs 122.

[0064] Specifically, the first rib 111 is annular and is arranged in the middle position of the annular groove 101 with the center of the annular groove 101 as the center of the circle. The second rib 122 is a curved structure. The cross-sections of the first rib 111 and the second rib 122 can be triangular or rectangular. When the connecting structure 3 and the blade 2 are installed, the connecting structure 3 and the blade 2 are respectively abutted against the first rib 111 and the second rib 122.

[0065] Ultrasonic welding uses high-frequency vibration waves to transmit to the surfaces of two objects to be welded. Under pressure, the two surfaces of the objects rub against each other to form a fusion between the molecular layers. When ultrasonic waves act on the contact surface of thermoplastic plastics, they will generate high-frequency vibrations of tens of thousands of times per second. This high-frequency vibration with a certain amplitude transmits ultrasonic energy to the welding area through the upper weldment. Since the welding area, i.e., the interface between the two welds, has a large acoustic resistance, local high temperature will be generated. Due to the poor thermal conductivity of plastics, it cannot be dissipated in time for a while and gathers in the welding area, causing the contact surface of the two plastics to melt rapidly. After a certain pressure is applied, it is fused into one. When the ultrasonic wave stops acting, the pressure is allowed to continue for a few seconds to solidify and form, thus forming a strong molecular chain to achieve the purpose of welding. The welding strength can be close to the strength of the raw materials.

[0066] In this embodiment, the first rib 111 and the second rib 122 are essentially welding ribs, which can increase the welding area, and the sol fills the annular groove 101 and the blade groove 102. The welding ribs will melt during the welding process, thereby improving the connection strength between the blade 2 and the disk 1 and between the blade 2 and the blade 2. This design helps to ensure that the connection between the blade 2 and the disk 1 is more secure during the operation of the fan, and reduces the risk of failure caused by unstable connection. The setting of the welding ribs can concentrate ultrasonic energy, quickly heat and melt plastic or metal, and achieve rapid welding, which helps to improve welding efficiency, reduce welding time, and reduce material damage caused by long-term heating. The welding ribs can serve as a reinforcing structure to improve the structural stability of the entire fan blade, help ensure uniform melting of materials during welding, reduce welding defects such as cold welding, cracks, etc., help improve the welding quality of the fan blade, and ensure the reliability of the fan blade in long-term use. In other embodiments, the setting of the welding ribs can be adjusted according to specific application requirements to provide flexibility in setting. This flexibility can optimize the design of the fan blade according to specific aerodynamic performance requirements, structural strength requirements, and manufacturing process requirements.

[0067] See also Figure 7 and Fig. 9 As shown, a first connecting rib 203 is provided at the connection between one side of the blade 2 and the corresponding connecting structure 3, and a second connecting rib 204 is provided at the connection between the other side of the blade 2 and the corresponding connecting structure 3; the first transition zone 103 and the second transition zone 104 are respectively provided at the connection between the two sides of the opening 121 and the annular groove 101, the first connecting rib 203 of the first middle-section fan blade 4 is connected to the first transition zone 103 of the second middle-section fan blade 4, and the second connecting rib 204 of the first middle-section fan blade 4 is connected to the second transition zone 104 of the second middle-section fan blade 4.

[0068] Specifically, both sides of the blade root section 202 transition to the connecting structure 3 through the first connecting rib 203 and the second connecting rib 204 respectively. When the connecting structure 3 and the blade 2 are connected to the disc 1 of the adjacent mid-section wind blade 4, the blade 2 is installed in the blade groove 102, and the connecting structure 3 is installed in the annular groove 101. At the same time, the first connecting rib 203 and the second connecting rib 204 are also respectively fitted with the first transition zone 103 and the second transition zone 104. At this time, the connecting structure 3, the blade 2 and the connecting ribs are all connected to the disc 1 in the form of surface contact.

[0069] In this embodiment, the connecting rib is arranged at the connection between the blade 2 and the connecting structure 3, which can improve the connection strength between the blade 2 and the connecting structure 3. The setting of the transition zone helps to provide a smooth stress transition area between the blade 2 and the connecting structure 3, reduce stress concentration, and avoid excessive local stress in the connection area, thereby improving the fatigue life of the entire structure. During the ultrasonic welding process, the setting of the connecting rib and the transition zone can provide a larger contact area, which helps to improve the welding quality and reduce the possibility of cold welding. In addition, the setting of the connecting rib and the transition zone helps to improve the structural stability of the entire fan blade. During the operation of the fan, this stability helps to reduce vibration and noise. The outer shape of the connecting rib is preferably connected to the suction surface and pressure surface of the blade 2 through an arc transition, and can also be connected in a straight line. The connecting structure 3 strengthens the strength between the ring and the blade 2, and at the same time increases the sol area between the two middle-section fan blades 4 during welding.

[0070] See also Figure 8 As shown, the end face of the disk 1 facing away from the blade 2 is the second end face 11, and the second end face 11 is provided with an annular groove 101. The outer diameter of the connecting structure 3 is D2. Taking the cross section of the first end 21 as the projection surface, in the radial direction, the circle corresponding to the largest part of the end of the root section 202 is the first circle, and the circle corresponding to the end of the tip section 201 extending toward the center of the disk 1 is the second circle. The diameter of the first circle is D3, and the diameter of the second circle is D4. The outer diameter D2, the diameter D3 and the diameter D4 satisfy: D2-D3<(D2-D4) / 3.

[0071] In the present embodiment, the width of the disk 1 is designed not to exceed 1 / 3 of the radial width of the blade 2, thereby ensuring the welding strength of the two middle-section fan blades 4 and the smooth and reliable production of the mold. Moreover, by setting a connecting structure, compared with the prior art, the welding area between the two middle-section fan blades in the present embodiment is increased by more than 40% when welding, thereby greatly improving the welding strength. At the same time, during welding, the annular groove of the second end face 11 is welded to the connecting structure 3 of the first middle-section fan blade 4, and the overflowed sol is distributed in the annular groove 101 area, thereby improving the noise problem caused by the protruding amount of sol in the blade area in the existing blade welding method.

[0072] As a specific implementation manner, the middle section fan blade 4 at one end is provided with a shaft cover, and the middle section fan blade 4 at the other end is provided with an end cover 6.

[0073] See also Fig.11 and 12 As shown, a crossflow fan includes a crossflow blade, and the crossflow blade is the crossflow blade mentioned above.

[0074] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0075] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A crossflow fan blade, comprising at least two middle-section fan blades (4) connected in sequence, characterized in that: The middle-section wind blade (4) comprises a disc (1), a connecting structure (3) and a plurality of blades (2); The blade (2) has a first end (21) and a second end (22), the first end (21) is connected to the disk (1), the second end (22) extends in the axial direction of the disk (1), the second ends (22) of adjacent blades (2) are respectively connected via the connecting structure (3), and the end surface of the connecting structure (3) facing away from the blade (2) is a first end surface (31); The end face of the disk (1) facing away from the blade (2) is a second end face (11), and an annular groove (101) and a plurality of blade grooves (102) arranged at intervals are arranged on the second end face (11). Taking the cross section of the disk (1) as the projection surface, the annular groove (101) is arranged on the outer edge of the disk (1), and the plurality of blade grooves (102) are located radially inward of the annular groove (101). The first end face (31) of the first middle-section fan blade (4) is respectively connected to the annular groove (101) of the second middle-section fan blade (4), and the blades (2) of the first middle-section fan blade (4) are respectively connected to the blade grooves (102) of the second middle-section fan blade (4).

2. The crossflow fan blade according to claim 1, characterized in that: The blade (2) comprises a blade tip section (201) and a blade root section (202) which are connected to each other. Taking the cross section of the blade (2) as a projection surface, the blade tip section (201) extends radially inward, and the blade root section (202) is connected to the connection structure (3).

3. The crossflow fan blade according to claim 2, characterized in that: The connecting structure (3) is connected to the end of the blade root section (202), and adjacent connecting structures (3) are connected in sequence to form an annular disk, wherein the end surface of the annular disk facing away from the blade (2) is the first end surface.

4. The crossflow fan blade according to claim 3, characterized in that: The end faces of the blade tip sections (201) are flush with the first end faces (31), and the blade tip sections (201) of the first middle-node fan blade (4) are respectively connected to the blade grooves (102) of the second middle-node fan blade (4).

5. The crossflow fan blade according to claim 2, characterized in that: The connecting structure (3) is connected to the side wall of the blade root section (202), the end faces of the blade root section (202) are flush with the first end face (31), and the blade root section (202) of the first middle-node fan blade (4) is respectively connected to the blade groove (102) of the second middle-node fan blade (4).

6. The crossflow fan blade according to claim 5, characterized in that: The end surface of the blade tip section (201) and the end surface of the blade root section (202) are both flush with the first end surface (31), and the blade tip section (201) and the blade root section (202) of the first mid-section fan blade (4) are respectively connected to the blade groove (102) of the second mid-section fan blade (4).

7. The crossflow fan blade according to claim 1, characterized in that: Taking the cross section of the disk (1) as a projection surface, one end of the blade groove (102) extends radially inwards, and the other end of the blade groove (102) is provided with an opening (121), and the opening (121) is connected to the annular groove (101).

8. The crossflow fan blade according to claim 7, characterized in that: A first annular rib (111) is provided in the annular groove (101), and the first end surface (31) of the first middle-section fan blade (4) is respectively in contact with the first rib (111); and second ribs (122) are respectively provided in the plurality of blade grooves (102), and the blades (2) of the first middle-section fan blade (4) are respectively in contact with the second ribs (122).

9. The crossflow fan blade according to claim 7, characterized in that: A first connecting rib (203) is provided at a connection point between one side of the blade (2) and the corresponding connecting structure (3), and a second connecting rib (204) is provided at a connection point between the other side of the blade (2) and the corresponding connecting structure (3); a first transition zone (103) and a second transition zone (104) are respectively provided at the connection points between the two sides of the opening (121) and the annular groove (101); the first connecting rib (203) of the first middle-section wind blade (4) is connected to the first transition zone (103) of the second middle-section wind blade (4), and the second connecting rib (204) of the first middle-section wind blade (4) is connected to the second transition zone (104) of the second middle-section wind blade (4).

10. The crossflow fan blade according to claim 3, characterized in that: Taking the cross section of the first end (21) as a projection surface, in the radial direction, the outer diameter of the annular disk is D2, the circle corresponding to the largest point of the end of the blade root section (202) is a first circle, and the circle corresponding to the end of the blade tip section (201) extending radially inward is a second circle, the diameter of the first circle is D3, the diameter of the second circle is D4, and the outer diameter D2, the diameter D3 and the diameter D4 satisfy: D2-D3<(D2-D4) / 3.

11. A crossflow fan, comprising a crossflow fan blade, characterized in that: The crossflow fan blade is the crossflow fan blade according to any one of claims 1 to 10.

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