Cross-flow fan blade and cross-flow fan

Abstract

The cross-flow fan blade comprises a shaft cover assembly and a modularized impeller set, the shaft cover assembly comprises a first shaft cover and a second shaft cover which are coaxially arranged, the first shaft cover is provided with a connecting shaft extending in the axial direction, and the tail end of the connecting shaft is provided with an elastic arm type structure; the surface, facing the first shaft cover, of the second shaft cover extends in the axial direction to form a hollow connecting column, and an adjustable locking piece is arranged on the connecting column. The modular impeller set comprises at least two middle section discs connected in series, each middle section disc comprises a disc body and a plurality of blades, a through hole penetrating in the axial direction is formed in the disc body, a plurality of blade holes are formed in the disc body in the circumferential direction of the disc body, and the ends, close to the disc body, of the blades are inserted into the blade holes so that the blades can be fixedly connected with the disc body. The cross-flow fan blade can replace a traditional mode that screws are adopted for fixing, the phenomenon that in the installation process, the threads are prone to loosing is avoided, and the stability of the blade is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioner accessory technical field, especially a kind of cross-flow fan blade and cross-flow fan. BACKGROUND

[0002] Cross-flow Fan Blade, also known as cross-flow fan blade, is a core fluid power component widely used in ventilation, air conditioning, air purification and refrigeration equipment. Its structure is usually composed of multiple arc-shaped blades arranged in parallel along the axial direction, forming a cylindrical or approximately cylindrical impeller structure. Unlike traditional axial or centrifugal fan blades, the airflow path of cross-flow fan blade enters perpendicular to the impeller axis and flows circumferentially inside the impeller before being discharged from the other side, forming a unique "cross-flow" effect. This design enables it to achieve long-distance, uniform airflow delivery in limited space, while maintaining low noise and high efficiency.

[0003] With the miniaturization and modularization trend of home appliances, the assembly process of cross-flow fan blade has gradually become a key factor restricting production efficiency and product quality. Among them, the traditional assembly method of cross-flow fan blade mainly relies on screw connection. Whether it is the installation between fan blade and fixed part, or the butt joint between two groups of fan blades, screw connection is the mainstream method. Although screw connection has the advantage of robust structure, it not only takes a long time to install and has low installation efficiency, but also is prone to slipping during installation, resulting in unstable connection. SUMMARY

[0004] To solve the above technical problems or at least partially solve the above technical problems, the present application provides a cross-flow fan blade and a cross-flow fan.

[0005] In the first aspect, the present application provides a cross-flow fan blade, comprising:

[0006] A shaft cover assembly comprising a first shaft cover and a second shaft cover arranged coaxially, the first shaft cover is provided with a connecting shaft extending in the axial direction, the end of the connecting shaft is provided with a spring arm structure for connecting with the drive shaft of the motor, the surface of the second shaft cover facing the first shaft cover extends in the axial direction with a hollow connecting column, the connecting column is provided with an adjustable locking piece for locking the components inserted into the interior of the connecting column;

[0007] A modular impeller group comprising at least two series-connected hub plates, one hub plate closest to the first shaft cover is connected to the end face of the first shaft cover, and one hub plate closest to the second shaft cover is connected to the end face of the second shaft cover;

[0008] Each of the intermediate disks comprises a disk body and a plurality of blades, the disk body is provided with a through hole penetrating in the axial direction, and a plurality of blade holes are arranged in the circumferential direction of the disk body, and the blades are inserted into the blade holes at one end close to the disk body, so that the blades are fixedly connected with the disk body.

[0009] In a possible implementation, the blade hole comprises a first positioning hole part, a second positioning hole part, and a locking hole part connecting the two, the locking hole part is arc-shaped, and is located between the first positioning hole part and the second positioning hole part.

[0010] The blades have a leeward surface and a windward surface, and an elastic protrusion with an arc-shaped cross section is arranged at one end of the blade close to the disk body, the elastic protrusion is located on the leeward surface and is matched with the locking hole to fix the blade with the disk body.

[0011] In a possible implementation, the leeward surface is provided with an arc-shaped groove arranged in an arc shape, and a wear-resistant coating is coated on the groove surface of the arc-shaped groove, and the windward surface is coated with a drag-reducing coating.

[0012] In a possible implementation, the wear-resistant coating is a diamond carbon film, the thickness of the diamond carbon film is 50-80 μm, and the surface roughness Ra is less than or equal to 0.2 μm; and / or,

[0013] The drag-reducing coating is made of a hydrophobic silicone composite material, and the contact angle of the drag-reducing coating is greater than or equal to 150°.

[0014] In a possible implementation, the surface of the first shaft cover towards the disk body is provided with a connecting ring in the circumferential direction, the surface of the connecting ring is provided with external threads, and the end surface of the disk body close to the first shaft cover is provided with a connecting groove matched with the connecting ring, so that the pre-tightening force of the intermediate disk can be adjusted by rotating the first shaft cover.

[0015] In a possible implementation, a through hole is arranged in the center of the shaft cover, the connecting shaft comprises an integral fixing section and a connecting section, the diameter of the connecting section is smaller than that of the fixing section, and the end surface of the fixing section close to the connecting section abuts against the first surface of the first shaft cover; when the connecting shaft is arranged in the through hole, the fixing section is located on one side of the second surface of the second shaft cover, the connecting section is located on one side of the first surface, and the elastic arm structure is arranged at the end of the connecting section.

[0016] In a possible implementation, a plurality of outwardly extending reinforcing ribs are arranged in the circumferential direction of the surface of the fixing section, and the reinforcing ribs are fixedly connected with the first surface.

[0017] In a possible implementation, the elastic arm structure comprises two elastic arms symmetrically arranged, and a connecting hole is formed in one end of the output shaft of the motor for connecting with the connecting shaft.

[0018] In a possible implementation, the first shaft cover, the second shaft cover and the middle disc are made of carbon fiber composite material.

[0019] In a second aspect, the application provides a cross-flow fan, comprising the cross-flow fan blade and the motor in the above embodiments, and the motor is used for driving the cross-flow fan blade to rotate.

[0020] Compared with the prior art, the above technical solution provided by the embodiments of the application has the following advantages:

[0021] The first shaft cover and the second shaft cover are coaxially arranged to define a mounting hole space, and then a plurality of middle discs are sequentially connected in the mounting space to complete the rapid assembly of the cross-flow fan blade. Each middle disc comprises a disc body and a plurality of blades, and a plurality of blade holes are distributed on the disc body in the circumferential direction, so that the blades can be quickly and firmly inserted on the disc body, thereby facilitating the installation and replacement of the blades, replacing the traditional screw fixing mode, avoiding the occurrence of the sliding tooth phenomenon in the installation process, and ensuring the stability of the blades.

[0022] In addition, the connecting shaft is arranged on the first shaft cover, and an elastic arm structure is arranged at the end of the connecting shaft, so that when the connecting shaft is inserted into the transmission shaft of the motor, the elastic arm structure is in a compressed state, and after the connecting shaft is deeply inserted into the clamping groove of the transmission shaft, the elastic arm structure rebounds due to its elastic force, and is clamped into the clamping groove, thereby achieving the firm connection of the connecting shaft and the motor, and ensuring the stability of the power output. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of a cross-flow fan blade according to an embodiment of the application;

[0024] Figure 2 is a structural schematic diagram of a cross-flow fan blade according to an embodiment of the application from another perspective;

[0025] Figure 3 is a structural schematic diagram of a disc body in a cross-flow fan blade according to an embodiment of the application;

[0026] Figure 4 is a structural schematic diagram of a blade in a cross-flow fan blade according to an embodiment of the application

[0027] Figure 5 is a structural schematic diagram of a first shaft cover in a cross-flow fan blade according to an embodiment of the application;

[0028] Figure 6 is another embodiment structure schematic view of the middle disc body of the cross-flow fan blade

[0029] Figure 7 is a structure schematic view of the second shaft cover of the cross-flow fan blade.

[0030] Reference signs:

[0031] 10, shaft cover assembly; 11, first shaft cover; 11a, first surface; 11b, second surface; 12, second shaft cover; 20, connecting shaft; 21, fixed section; 22, connecting section; 30, elastic arm; 40, middle section disc; 411, disc body; 412, blade; 50, blade hole; 51, first positioning hole part; 52, second positioning hole part; 53, locking hole part; 60, elastic protrusion; 70, reinforcing rib; 80, connecting ring; 90, connecting groove; 100, connecting column; 110, locking piece. DETAILED DESCRIPTION

[0032] In order to have a clearer understanding of the technical features, objectives and effects of the utility model, the specific implementation mode of the utility model will be described in detail with reference to the drawings. In the following description, it should be understood that the directions or position relations indicated by "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like are based on the directions or position relations shown in the drawings, constructed and operated in a particular direction, and are only for the convenience of describing the technical scheme, and cannot be understood as indicating that the indicated device or element must have a particular direction, so it cannot be understood as a limitation on the utility model.

[0033] It should also be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing", "setting" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there can be one or more intermediate elements. The terms "first", "second", "third" and the like are only for the convenience of describing the technical scheme, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features, so the features with "first", "second", "third" and the like can be explicitly or implicitly include one or more features. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0035] like Figures 1 to 7 As shown in the figure, an embodiment of the present invention provides a cross-flow fan blade. The cross-flow fan includes a shaft cover assembly 10 and a modular impeller. The shaft cover assembly 10 includes a first shaft cover 11 and a second shaft cover 12 coaxially arranged. The first shaft cover 11 has a connecting shaft 20 extending axially. The end of the connecting shaft 20 has a spring arm 30 structure for connecting to the drive shaft of a motor. The second shaft cover 12 has a hollow connecting post 100 extending axially from the surface facing the first shaft cover 11. The connecting post 100 is provided with an adjustable locking member 110 for locking components extending into the connecting post 100. The modular impeller assembly includes at least two intermediate section discs 40 connected in series. The intermediate section disc 40 closest to the first shaft cover 11 is connected to the end face of the first shaft cover 11, and the intermediate section disc 40 closest to the second shaft cover 12 is connected to the end face of the second shaft cover 12. Each intermediate section disc 40 includes a disc body 411 and multiple blades 412. The disc body 411 has a through hole that runs through the axial direction, and multiple blade holes 50 are arranged on the disc body 411 along its circumference. One end of the blade 412 near the disc body 411 is inserted into the blade hole 50 so that the blade 412 is fixedly connected to the disc body 411.

[0036] In this embodiment, the cross-flow fan blade defines the mounting hole space through a first shaft cover 11 and a second shaft cover 12 arranged coaxially. Multiple intermediate section discs 40 are then sequentially connected within this mounting space to achieve rapid assembly of the cross-flow fan blade. Furthermore, each intermediate section disc 40 includes a disc body 411 and multiple blades 412. Multiple blade holes 50 are distributed circumferentially on the disc body 411 to allow for quick and secure insertion of the blades 412 onto the disc body 411. This facilitates the installation and replacement of the blades 412, replacing the traditional screw-based fixing method and avoiding stripping during installation, thus ensuring the stability of the blades 412.

[0037] Furthermore, by using a connecting shaft 20 on the first shaft cover 11 and a spring arm 30 structure at the end of the connecting shaft 20, when the connecting shaft 20 is inserted into the drive shaft of the motor, the spring arm 30 structure is in a compressed state. After the connecting shaft 20 is deeply inserted into the slot in the drive shaft, the spring arm 30 structure rebounds due to its own elasticity and then locks into the slot, thereby achieving a firm connection between the connecting shaft 20 and the motor, thus ensuring the stability of power output.

[0038] Exemplarily, the connecting component (for example, connecting strip) outside extends into the connecting column 100 from the opening, and then the locking piece 110 is pushed into the connecting column 100 to lock the components inside the connecting column 100, so as to realize the fixed connection of the cross-flow fan blade and the external mechanism, which is simple in structure and convenient to disassemble and assemble.

[0039] Here, it should be noted that, in order to facilitate the description of the positional relationship between the components, the two opposite surfaces of the first shaft cover 11 are defined as the first surface 11a and the second surface 11b, and the above-mentioned first surface 11a and second surface 11b do not have a limiting effect.

[0040] Exemplarily, the connecting shaft 20 is arranged on the first surface 11a of the shaft cover, so as to be directly connected with the output shaft of the motor, thereby ensuring the stability of power output. Meanwhile, the perforation on the disc body 411 realizes axial penetration, which is beneficial to the smooth passing of airflow.

[0041] In a possible implementation, the blade hole 50 includes a first positioning hole part 51, a second positioning hole part 52, and a locking hole part 53 communicating the two, the locking hole part 53 is arc-shaped and located between the first positioning hole part 51 and the second positioning hole part 52. The blade 412 has a leeward surface and a windward surface, and an end of the blade 412 close to the disc body 411 is provided with an elastic protrusion 60 with an arc-shaped cross section, the elastic protrusion 60 is located on the leeward surface and is used to cooperate with the locking hole, so as to fix and connect the blade 412 and the disc body 411. That is, when the blade 412 is fixed and connected to the disc body 411, the end of the blade 412 provided with the elastic protrusion 60 is aligned with the blade hole 50, and then the blade 412 is pushed towards the disc body 411, so that the blade 412 is first inserted into the first positioning hole part 51 and the second positioning hole part 52 for positioning, thereby preventing the positional deviation during the insertion process from affecting the stability of the blade 412, and then as the blade 412 is continuously pushed in, the elastic protrusion 60 is pressed and penetrates into the locking hole part 53, due to the avoidance space of the locking hole part 53, the elastic protrusion 60 restores due to its own elasticity, thereby making the elastic protrusion 60 abut against the locking hole part 53, so as to realize the stable connection of the blade 412 and the disc body 411, without the need for screw fixation, which not only has a more beautiful appearance, but also is convenient for the installation and replacement of the blade 412, and can avoid the phenomenon of slipping during installation, thereby ensuring the stability of the blade 412.

[0042] In a possible implementation, the leeward surface is provided with an arc-shaped groove arranged in an arc shape, a surface of the arc-shaped groove is coated with a wear-resistant coating, and the windward surface is coated with a drag-reducing coating. That is, based on the arc-shaped groove arranged in an arc shape on the leeward surface, the airflow can be guided to form a stable flow path on the leeward surface, reducing airflow separation and vortex generation, thereby reducing energy loss. Meanwhile, the arrangement of the arc-shaped groove can effectively suppress the turbulent noise generated by the airflow on the leeward surface, improving the noise reduction performance of the fan blade.

[0043] In addition, the wear-resistant coating can significantly enhance the wear resistance of the blade 412, prolong the service life, and prevent the blade 412 from rusting or aging in a humid or corrosive environment, thereby reducing the maintenance cost of the equipment. The drag-reducing coating can reduce the frictional resistance between the airflow and the surface of the blade 412, thereby improving the operating efficiency of the blade 412.

[0044] Further, the wear-resistant coating is a diamond carbon film with a thickness of 50-80 μm and a surface roughness Ra≤0.2 μm, and / or the drag-reducing coating is made of a hydrophobic silicone composite material and has a contact angle ≥150°. In this way, the wear resistance of the blade 412 can be further significantly improved, and the blade 412 can be prevented from rusting or aging in a humid or corrosive environment, thereby reducing the maintenance cost of the equipment and prolonging the service life.

[0045] In a possible implementation, the surface of the first shaft cover 11 facing the disc body 411 is provided with a connecting ring 80 in the circumferential direction, the surface of the connecting ring 80 is provided with external threads, and the end surface of the disc body 411 close to the first shaft cover 11 is provided with a connecting groove 90 matched with the connecting ring 80, so that the first shaft cover 11 can be rotated to adjust the pre-tightening force of the pitch disc 40. In this way, the first shaft cover 11 is connected to the disc body 411 by being clamped into the connecting groove 90, and when the pre-tightening force between the pitch discs 40 needs to be adjusted, the first shaft cover 11 can be rotated to apply a pressing force to the disc body 411 connected thereto, thereby adjusting the pre-tightening force of the pitch disc 40.

[0046] In a possible implementation, the shaft cover is provided with a through hole in the center, the connecting shaft 20 includes an integrally formed fixed section 21 and a connecting section 22, the diameter of the connecting section 22 is smaller than that of the fixed section 21, and the end surface of the fixed section 21 close to the connecting section 22 abuts against the first surface 11a of the first shaft cover 11. When the connecting shaft 20 is arranged in the through hole, the fixed section 21 is located on one side of the second surface 11b of the first shaft cover 11, and the connecting end is located on one side of the first surface 11a of the first shaft cover 11.

[0047] In a possible implementation, the surface of the fixed section 21 is spaced apart in the circumferential direction and has a plurality of outwardly extending reinforcing ribs 70 fixedly connected to the first surface 11a. In this way, the structural strength of the fixed section 21 can be significantly improved, so that the fixed section 21 can withstand greater loads and stresses, and the cross-flow fan blade can be prevented from being deformed or damaged when rotating at high speed or encountering external impact, thereby improving the durability and reliability of the fan blade.

[0048] In a possible implementation, the elastic arm 30 is symmetrically arranged, and the output shaft of the motor is provided with a connecting hole at one end connected to the connecting shaft 20, and the connecting hole is provided with a clamping groove matched with the elastic arm 30. That is, when the cross-flow fan blade is connected to the motor, the connecting section 22 of the connecting shaft 20 is inserted into the connecting hole, at this time the elastic arm 30 is pressed into the connecting hole, and as the connecting shaft 20 continuously penetrates, the elastic arm 30 is moved to the position of the clamping groove, and the elastic arm 30 rebounds due to its own elastic force, and then is clamped into the clamping groove, thereby achieving firm connection of the connecting shaft 20 and the motor, thereby ensuring the stability of the power output.

[0049] In a possible implementation, the shaft cover, the second shaft cover 12 and the middle disc 40 are made of carbon fiber composite material. That is, the first shaft cover 11, the second shaft cover 12 and the middle disc 40 made of carbon fiber composite material not only improve the structural strength and durability of the cross-flow fan blade, but also optimize the kinetic performance and thermal stability, thereby providing a strong guarantee for efficient and stable operation of the cross-flow fan blade in various application scenarios.

[0050] The application also includes a cross-flow fan, which comprises the cross-flow fan blade and the motor.

[0051] The cross-flow fan according to the embodiments of the present disclosure adopts the cross-flow fan blade, and has the same technical effects as the cross-flow fan blade, which will not be described here.

[0052] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should be regarded as the protection scope of the present application.

Claims

1. A cross-flow impeller, characterized by, The application relates to a shaft cover assembly and a modular impeller group. The shaft cover assembly comprises coaxially arranged first and second shaft covers, the first shaft cover is provided with an axially extending connecting shaft, the end of the connecting shaft is provided with a spring arm structure for connecting with a transmission shaft of a motor, and the surface of the second shaft cover towards the first shaft cover is axially extended with a hollow connecting column, the connecting column is provided with adjustable locking members for locking components inserted into the inside of the connecting column. The modular impeller group comprises at least two series-connected middle discs, one of the middle discs closest to the first shaft cover is connected with the end surface of the first shaft cover, and one of the middle discs closest to the second shaft cover is connected with the end surface of the second shaft cover. Each of the middle discs comprises a disc body and a plurality of blades, the disc body is provided with an axially extending through hole, and the disc body is circumferentially arranged with a plurality of blade holes, the blades are inserted into the blade holes close to the disc body, so that the blades are fixedly connected with the disc body.

2. The cross-flow impeller of claim 1, wherein, The blade hole comprises a first positioning hole part, a second positioning hole part and a locking hole part connecting the two, the locking hole part is arc-shaped and located between the first and second positioning hole parts. The blade has a leeward surface and a windward surface, and the end of the blade close to the disc body is provided with an arc-shaped elastic protrusion in cross section, the elastic protrusion is located on the leeward surface and used for cooperating with the locking hole to fix the blade with the disc body.

3. The cross-flow impeller of claim 2, wherein, The leeward surface is provided with an arc-shaped groove in an arc shape, the groove surface is coated with a wear-resistant coating, and the windward surface is coated with a drag-reducing coating.

4. The cross-flow impeller of claim 3, wherein, The wear-resistant coating is a diamond carbon film, the thickness of the diamond carbon film is 50-80 mu m, and the surface roughness Ra is less than or equal to 0.2 mu m; and / or The drag-reducing coating is made of a hydrophobic siloxane composite material, and the contact angle of the drag-reducing coating is greater than or equal to 150 degrees.

5. The cross-flow impeller of claim 1, wherein, The surface of the first shaft cover towards the disc body is circumferentially provided with a connecting ring, the surface of the connecting ring is provided with external threads, the end surface of the disc body close to the first shaft cover is provided with a connecting groove matched with the connecting ring, so that the first shaft cover can be rotated to adjust the pre-tightening force of the middle disc.

6. The cross-flow impeller of claim 1, wherein, The center of the shaft cover is provided with a through hole, the connecting shaft comprises an integral fixing section and a connecting section, the diameter of the connecting section is smaller than that of the fixing section, and the end surface of the fixing section close to the connecting section abuts against the first surface of the first shaft cover; when the connecting shaft is arranged in the through hole, the fixing section is located on one side of the second surface of the first shaft cover, the connecting section is located on one side of the first surface, and the spring arm structure is arranged at the end of the connecting section.

7. The cross-flow impeller of claim 6, wherein, The surface of the fixing section is circumferentially and spacedly provided with a plurality of outwardly extending reinforcing ribs, and the reinforcing ribs are fixedly connected with the first surface.

8. The cross-flow impeller of claim 1, wherein, The spring arm structure comprises two symmetrically arranged spring arms, the output shaft of the motor is provided with a connecting hole for connecting with the connecting shaft, and the connecting hole is provided with a clamping groove matched with the spring arms.

9. The cross-flow impeller of claim 1, wherein, The first shaft cover, the second shaft cover and the middle disc are made of carbon fiber composite material.

10. A cross-flow fan characterized by, The cross-flow fan blade and motor of any one of claims 1 to 9, wherein the motor is configured to drive rotation of the cross-flow fan blade.

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