Stacked fan structure, combined paddle-blade integrated fan, and automobile seat ventilation system

Abstract

A stacked fan structure, a combined paddle-blade integrated fan, and an automobile seat ventilation system. Two fan assemblies (1, 2) are integrally mounted together, and the two fan assemblies (1, 2) are controlled to work separately, so as to achieve the effect of switching between a suction mode and a blowing mode by means of an air port (3, 4). The structural design is simple, and air leakage is not easily caused; an additional switching motor is not needed, thereby reducing the space occupied for mounting the motor, and reducing the total weight of the structure; the present invention has a sufficient air flow, thereby achieving a good ventilation effect.

Description

A stacked fan structure, a combined blade fan, and a car seat ventilation system

[0001] Relevant publicly available cross-references

[0002] This disclosure claims priority to Chinese patent applications filed on December 13, 2024, with application number 2024118424242 entitled "A Stacked Fan Structure for a Seat Blowing and Suction System"; Chinese patent applications filed on February 13, 2025, with application number 2025101614155 entitled "A Combined Blade Fan with Bidirectional Asymmetrical Impellers and an Automobile Seat Ventilation System"; Chinese patent applications filed on December 13, 2024, with application number 2024118423358 entitled "A Double-Sided Independent Split-Action Fan"; and Chinese patent applications filed on December 13, 2024, with application number 2024118423324 entitled "An Ultra-Thin Double-Sided Independent Split-Action Fan for Seat Ventilation," the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure generally relates to the field of fan technology, and specifically to a stacked fan structure, a combined blade fan, and an automotive seat ventilation system. Background Technology

[0004] Existing car seats are equipped with ventilation devices, and to meet more usage needs, these devices have fan structures that combine blowing and suction functions.

[0005] To achieve both blowing and suction functions, existing fan structures have multiple air inlets, used for intake and exhaust during suction and intake and exhaust during blowing. Additionally, a wind deflector is provided, which can be controlled to block the intake or exhaust inlets individually, thus putting the fan structure into suction or blowing mode.

[0006] The design of the windbreak structure is relatively complex and prone to air leakage due to insufficient shielding. Moreover, controlling the switching state of the windbreak structure requires the installation of an additional control motor, which not only occupies space but also increases the total weight of the fan structure. Furthermore, the space occupied will reduce the airflow and result in unsatisfactory ventilation. Summary of the Invention

[0007] Firstly, the purpose of this disclosure includes providing a stacked fan structure that is less prone to air leakage; at the same time, it eliminates the need for additional switching motors, reducing the space occupied by motor installation and lowering the overall weight of the structure.

[0008] Secondly, the purpose of this disclosure includes providing a combined blade fan with bidirectional asymmetrical impellers, which is less prone to air leakage; therefore, it has sufficient gas flow and thus produces good ventilation.

[0009] The embodiments of this disclosure can be implemented as follows:

[0010] In a first aspect, this disclosure provides a stacked fan structure, including:

[0011] A first fan assembly has a first air vent and an internal first space; the first space is connected to the first air vent.

[0012] A second fan assembly has a second air vent and an internal second space; the second space is connected to the second air vent.

[0013] The first fan assembly and the second fan assembly are interconnected, and the first space and the second space are in communication.

[0014] When the first fan assembly is actively working and the second fan assembly is not working, the second air vent acts as an air intake and the first air vent acts as an air outlet; the air flow direction passes sequentially through the second air vent, the second space, the first space, and the first air vent.

[0015] When the second fan assembly is actively working and the first fan assembly is not working, the first air vent serves as the air intake and the second air vent serves as the air outlet; the air flow direction passes sequentially through the first air vent, the first space, the second space, and the second air vent.

[0016] Optionally, the first fan assembly includes a first housing and a second housing, with the first housing and the second housing forming the first space;

[0017] The second fan assembly includes a third housing and a fourth housing, with the second space formed between the third housing and the fourth housing;

[0018] The second housing and the third housing are connected by a connecting structure;

[0019] The second housing is provided with a first connecting hole on the side near the third housing and the third housing is provided with a first connecting hole on the side near the second housing. The connecting structure connects the two first connecting holes and is configured to connect the first space and the second space.

[0020] Optionally, the connection structure includes a connecting pipe that connects the first space and the second space.

[0021] Optionally, the first fan assembly includes a fifth housing, and the second fan assembly includes a seventh housing;

[0022] A sixth housing is installed between the fifth housing and the seventh housing; the sixth housing and the fifth housing form the first space; the sixth housing and the seventh housing form the second space; the sixth housing has a second connecting hole configured to connect the first space and the second space.

[0023] Optionally, a connector is installed between the sixth housing and both the first fan assembly and the second fan assembly, configured to fix the first fan assembly, the second fan assembly, and the sixth housing.

[0024] Optionally, the sixth housing has a protrusion; the diameter of the fifth housing is greater than the diameter of the seventh housing, and the diameter of the protrusion is greater than or equal to the diameter of the fifth housing; a connection space is formed between the protrusion and the fifth housing, configured to connect with the air guide layer.

[0025] Optionally, the connection structure includes a sealing ring and a fixing structure, wherein the first fan assembly and the second fan assembly are fixed to each other by the fixing structure, and the gap between the first fan assembly and the second fan assembly is sealed by the sealing ring.

[0026] Optionally, the first fan assembly includes a first impeller, and the second fan assembly includes a second impeller; both the first impeller and the second impeller include fan blades; the dimensions of the first impeller and the second impeller, and the length, thickness, and tilt angle of the fan blades on the first impeller and the second impeller are different in at least one of the following:

[0027] Optionally, the first fan assembly and the second fan assembly share a circuit board.

[0028] Optionally, the stator of the first fan assembly and the stator of the second fan assembly are offset from each other.

[0029] Secondly, this disclosure provides a combined blade fan with bidirectional asymmetrical impellers, configured as a ventilation system for automotive seats, comprising:

[0030] A housing assembly having a first space and a second space that are interconnected inside; the housing assembly having a first airflow exchange port and a second airflow exchange port; the first space is connected to the first airflow exchange port, and the second space is connected to the second airflow exchange port;

[0031] A first leaf-dispensing fan assembly and a second leaf-dispensing fan assembly are installed in the first space; the second leaf-dispensing fan assembly is installed in the second space; the first leaf-dispensing fan assembly and the second leaf-dispensing fan assembly operate independently.

[0032] When the first deflector fan assembly is actively working, gas flows from the side of the car seat closest to the occupant, through the second airflow exchange port, the second space, the first space, and the first airflow exchange port to the side of the car seat away from the occupant.

[0033] When the second deflector fan assembly is actively working, gas flows from the side of the car seat away from the occupant, through the first airflow exchange port, the first space, the second space, and the second airflow exchange port to the side of the car seat closer to the occupant.

[0034] The first blade-dispensing fan assembly includes a first impeller; the second blade-dispensing fan assembly includes a second impeller;

[0035] The first impeller and the second impeller have different thicknesses along their respective axes of rotation.

[0036] Optionally, the thickness of the first impeller along its axis of rotation is greater than the thickness of the second impeller along its axis of rotation.

[0037] Optionally, the length of the first impeller in the direction perpendicular to the rotation axis is less than the length of the second impeller in the direction perpendicular to the rotation axis.

[0038] Optionally, both the second impeller and the first impeller are centrifugal structures with blades, and the second impeller and the first impeller rotate in opposite directions, driving the gas to move in opposite directions; the second airflow exchange port and the first airflow exchange port are both located on the side wall of the housing assembly.

[0039] Optionally, the housing assembly includes:

[0040] An upper shell, a middle shell, and a lower shell are interconnected; a first space is formed between the upper shell and the middle shell; a second space is formed between the middle shell and the lower shell.

[0041] Optionally, the outer side wall of the middle housing has a second protrusion, which is configured to connect with the support layer to fix the relative position of the housing assembly and the support layer.

[0042] Optionally, the diameter of the lower housing is greater than the diameter of the upper housing, and the diameter of the second protrusion is greater than or equal to the diameter of the lower housing; a connection space is formed between the second protrusion and the lower housing, configured to connect with the air guide layer, and fix the relative position between the housing assembly and the air guide layer.

[0043] On the other hand, this disclosure also provides an automotive seat ventilation system, including:

[0044] A combined blade fan with bidirectional asymmetrical impellers as described in any of the above;

[0045] A support layer is configured to connect a space near the occupant and a space away from the occupant; the support layer has an air guide on the side away from the occupant; the housing assembly is connected to the air guide, and the second airflow exchange port is connected to the internal space of the air guide.

[0046] Optionally, the air guide includes an air guide layer and an air bag membrane, the air bag membrane covering the air guide layer; the air guide layer has an installation groove, the housing assembly is disposed in the installation groove, and the second airflow exchange port communicates with the internal space of the air guide layer; the air bag membrane has a ventilation hole on the side near the support layer, the ventilation hole is correspondingly connected to the ventilation duct, and the air bag membrane has a first installation hole on the side away from the support layer corresponding to the installation groove, configured to accommodate the housing assembly.

[0047] Optionally, the air guide includes an air guide groove that communicates with the ventilation duct. A sealing layer is provided on the side of the air guide groove away from the support layer. A second mounting hole is provided on the sealing layer. The housing assembly passes through the second mounting hole and is disposed in the air guide groove. The second airflow exchange port and the internal space formed by the air guide groove and the sealing layer are in communication.

[0048] The beneficial effects of this disclosure are as follows:

[0049] Firstly, this disclosure proposes a stacked fan structure that integrates two fan components together. Each fan component has an air outlet and an internal space; the internal spaces of the two fan components are connected. When one fan component is operating, its air outlet serves as a blowing outlet, and the air outlet of the other fan component serves as a suction outlet. By controlling the two fan components to operate independently, the effect of switching between suction and blowing modes with a single air outlet can be achieved. The above method has a simple internal structure design, is less prone to air leakage, and eliminates the need for an additional switching motor, reducing the space occupied by motor installation and lowering the overall weight of the structure.

[0050] Secondly, this disclosure proposes a combined blade fan with bidirectional asymmetrical impellers. The fan housing is mounted on a car seat, and the housing contains interconnected first and second spaces, a second airflow exchange port, and a first airflow exchange port. A first blade fan assembly is installed in the first space, and a second blade fan assembly is installed in the second space. The first and second impellers are coaxially arranged and in opposite directions. Therefore, during operation, controlling the first and second blade fan assemblies separately can perform both suction and blowing functions, resulting in a simple and convenient structure. Because there is only one path for gas flow, air leakage is unlikely; thus, sufficient gas flow is achieved, resulting in good ventilation. Attached Figure Description

[0051] Other features, objects, and advantages of this disclosure will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0052] Figure 1 is a schematic diagram of the fan structure in one embodiment;

[0053] Figure 2 is a cross-sectional view of the first fan assembly in operation according to an embodiment;

[0054] Figure 3 is a cross-sectional view of the second fan assembly in operation according to an embodiment;

[0055] Figure 4 is a schematic diagram of the fan structure in another embodiment;

[0056] Figure 5 is a cross-sectional view of the first fan assembly in operation according to another embodiment;

[0057] Figure 6 is a cross-sectional view of the second fan assembly in operation according to another embodiment;

[0058] Figure 7 is a schematic diagram of the structure of the third and fourth housings in another embodiment;

[0059] Figure 8 is a cross-sectional view of the first fan assembly when the air guide housing is installed and the first fan assembly is working.

[0060] Figure 9 is a cross-sectional view of the second fan assembly when the air guide housing is installed and the second fan assembly is working.

[0061] Figure 10 is a schematic diagram of a second fan assembly being an axial fan in another embodiment;

[0062] Figure 11 is a cross-sectional view of the first fan assembly when the second fan assembly is an axial fan;

[0063] Figure 12 is a cross-sectional view of the second fan assembly as an axial fan when the second fan assembly is in operation;

[0064] Figure 13 is a cross-sectional view of the first fan assembly when the first fan assembly of the air guide layer is working;

[0065] Figure 14 is a cross-sectional view of the first fan assembly as the air guide layer and the second fan assembly in operation;

[0066] Figure 15 is a schematic diagram of the first fan assembly being a centrifugal fan and the second fan assembly being an axial fan;

[0067] Figure 16 is a schematic diagram of the first fan assembly in Figure 15 when it is working;

[0068] Figure 17 is a schematic diagram of the second fan assembly in Figure 15 when it is working;

[0069] Figure 18 is an exploded view of a stacked fan structure;

[0070] Figure 19 is an exploded view of the housings of the first fan assembly and the second fan assembly;

[0071] Figure 20 is a schematic diagram of the structure with the connecting part installed;

[0072] Figure 21 is a cross-sectional view of the first fan assembly when the connecting part is installed and the first fan assembly is working;

[0073] Figure 22 is a cross-sectional view of the second fan assembly when the connecting part is installed and the second fan assembly is working;

[0074] Figure 23 is a cross-sectional view of a sixth housing installed and the first fan assembly in operation in another embodiment;

[0075] Figure 24 is a cross-sectional view of a second fan assembly installed with a sixth housing in another embodiment.

[0076] Figure 25 is a front view of the fan when the diameter of the first protrusion is equal to that of the fifth housing.

[0077] Figure 26 is a cross-sectional view of the fan when the diameter of the first protrusion is equal to that of the fifth housing;

[0078] Figure 27 is a schematic diagram of the fan installed on the air guide layer when the diameter of the first protrusion is equal to that of the fifth housing.

[0079] Figure 28 is an exploded view of a combined blade fan with bidirectional asymmetrical impellers;

[0080] Figure 29 is a cross-sectional view of the fan in one embodiment;

[0081] Figure 30 is a cross-sectional view of the fan in another embodiment;

[0082] Figure 31 is a cross-sectional view of the fan in another embodiment;

[0083] Figure 32 is a schematic diagram of the second protrusion being installed on the support layer in one embodiment;

[0084] Figure 33 is a schematic diagram of the second protrusion being installed on the support layer in another embodiment;

[0085] Figure 34 is a schematic diagram of the second protrusion being installed on the support layer in another embodiment;

[0086] Figure 35 is a schematic diagram of the fan mounted on the support layer when the diameter of the second protrusion is equal to that of the lower housing.

[0087] Figure 36 is a schematic diagram of the first fan assembly in its first state.

[0088] Figure 37 is a schematic diagram of the second fan assembly in the first state.

[0089] Figure 38 is a schematic diagram of a split-type connecting shell.

[0090] Figure 39 is an exploded view of an ultra-thin dual-sided independent split fan;

[0091] Figure 40 is a cross-sectional view of an ultra-thin dual-sided independent split fan;

[0092] Figure 41 is a schematic diagram of the installation structure of the fan and the seat.

[0093] Wherein: 1-First fan assembly; 2-Second fan assembly; 3-First air outlet; 4-Second air outlet; 5-Connecting pipe; 6-Sixth housing; 7-Connecting piece; 8-Rotating shaft; 9-First housing; 10-Second housing; 11-Third housing; 12-Fourth housing; 13-Fifth housing; 14-Seventh housing; 15-Air guide layer; 16-Fan blade; 17-Separator plate; 18-Connecting part; 19-Second through hole; 20-First protrusion;

[0094] 31-Shell assembly; 32-Second airflow exchange port; 33-First airflow exchange port; 34-Second blade fan assembly; 35-First blade fan assembly; 36-Second impeller; 37-First impeller; 38-Second protrusion; 39-Support layer; 310-Mounting groove; 311-Air guide layer; 312-Air bag membrane; 313-Upper shell; 314-Middle shell; 315-Lower shell; 316-Ventilation duct;

[0095] 41-Mounting housing; 42-First fan assembly; 43-Second fan assembly; 44-Control circuit board; 45-First cover; 46-Second cover; 47-Connecting housing; 48-First opening; 49-Second opening; 410-First impeller; 411-First output shaft; 412-First air inlet / outlet; 413-Second air inlet / outlet; 414-Second impeller; 415-Second output shaft; 416-Third air inlet / outlet; 417-Fourth air inlet / outlet; 418-Through hole; 419-First connecting plate; 420-Second connecting plate; 421-Third connecting plate; 422-First motor; 423-Second motor;

[0096] 51-First air guide section; 52-Second air guide section; 53-Impeller; 531-First working surface; 532-Second working surface; 54-First housing; 55-Central housing; 56-Ventilation section; 57-Drive shaft; 58-Circuit board; 59-Hollow coil; 510-Rotating magnet; 512-Rotating assembly; 513-Copper central tube; 514-Bearing; 515-Pre-compression elastic element; 516-Rotor frame; 517-First air outlet; 518-Second air outlet; 519-C-ring; 20-Copper cap; 521-Protrusion; 523-Seat; 524-Seat spring frame; 525-Pulley; 526-Reinforcing rib; 527-Groove. Detailed Implementation

[0097] The present disclosure will now be described in detail, optionally, with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant disclosure and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the disclosure are shown in the accompanying drawings.

[0098] It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other. This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0099] This disclosure provides a stacked fan structure, a combined blade fan, a dual-sided independent split fan, and an ultra-thin dual-sided independent split fan, all of which should be configured into an automotive seat ventilation system.

[0100] Please refer to Figures 1 and 18. The present disclosure provides a stacked fan structure that integrates two fan components, namely a first fan component 1 and a second fan component 2. By controlling the two fan components to work separately, the effect of switching between suction and blowing modes at a single air outlet can be achieved.

[0101] In all the accompanying drawings of this disclosure, the shaded areas indicate that the device is in operation.

[0102] Please refer to Figures 1 and 18. This disclosure provides a stacked fan structure, including:

[0103] A first fan assembly 1 has a first air vent 3 and a first space inside; the first space is connected to the first air vent 3.

[0104] The second fan assembly 2 has a second air vent 4 and a second space inside; the second space is connected to the second air vent 4.

[0105] The first fan assembly 1 and the second fan assembly 2 are interconnected, and the first space and the second space are connected.

[0106] In some embodiments, the fan assembly includes: an outer housing, a rotating shaft 8 (as a stator) fixedly mounted inside the housing, fan blades 16 (as a rotor) mounted inside the housing, and a circuit board electrically connected to the stator via PIN pins.

[0107] In some embodiments, referring to Figures 13-14, the first fan assembly 1 is mounted on the air guide layer 15 of the seat, and the first air outlet 3 is connected to the air guide layer 15 of the seat.

[0108] Referring to Figure 2, when the first fan assembly 1 is actively working and the second fan assembly 2 is not working, the second air vent 4 serves as the air intake and the first air vent 3 serves as the air outlet; the air flow direction passes sequentially through the second air vent 4, the second space, the first space, and the first air vent 3; the fan of the second fan assembly 2 will rotate automatically; thus realizing the function of blowing air onto the seat air guide layer 15, thereby realizing the air blowing on the seat surface.

[0109] Referring to Figure 3, when the second fan assembly 2 is actively working and the first fan assembly 1 is not working, the first air vent 3 serves as the air intake and the second air vent 4 serves as the air outlet; the air flow direction passes through the first air vent 3, the first space, the second space, and the second air vent 4 in sequence; the fan of the first fan assembly 1 will rotate automatically; thereby realizing the function of suctioning air to the seat air guide layer 15, and thus realizing air suction on the seat surface.

[0110] Understandably, during use, only one fan assembly is controlled to operate at a time, enabling the first air vent 3 to perform both suction and blowing functions, switching between suction and blowing modes. This method features a simple internal structure design, reducing the likelihood of air leakage; it also eliminates the need for an additional motor, minimizing the space required for motor installation and reducing the overall weight of the structure.

[0111] In some embodiments, referring to FIG7, the first housing 9 and the second housing 10 of the first fan assembly 1 are formed with air guide housings; the air guide housings are installed inside the air guide layer 15 of the seat, and air guide ports are provided on the air guide housings, which are in communication with the air guide layer 15 of the seat; gas flows through the air guide ports of the air guide housings between the air guide layer 15 and the first space of the first fan assembly; since the cross-section of the gas flow is reduced, the gas flow rate can be increased.

[0112] The gas flow patterns of the air guide housing under different operating modes are shown in Figures 8 and 9, with the arrows indicating the gas flow direction. In Figure 8, the first fan assembly 1 is operating; in Figure 9, the second fan assembly 2 is operating.

[0113] When the first fan assembly 1 is installed on the air guide layer 15, the schematic diagrams of the two working states of the two fan assemblies are shown in Figures 13 and 14. In Figure 13, the first fan assembly 1 is working; in Figure 14, the second fan assembly 2 is working; the arrows indicate the direction of gas flow. Referring to Figure 13, when the first fan assembly 1 is working, it realizes the function of blowing air onto the air guide layer 15, and when the second fan assembly is working, it realizes the function of suction air onto the air guide layer.

[0114] In this embodiment, the housings of the first fan assembly 1 and the second fan assembly 2 can be detachable or integral.

[0115] In some embodiments, referring to FIG19, the housings of the first fan assembly 1 and the second fan assembly 2 are detachable structures, specifically as follows:

[0116] The first fan assembly 1 includes a first housing 9 and a second housing 10, with a first space formed between the first housing 9 and the second housing 10;

[0117] The second fan assembly 2 includes a third housing 11 and a fourth housing 12, with a second space formed between the third housing 11 and the fourth housing 12;

[0118] The second housing 10 and the third housing 11 are connected by a connecting structure, and the first space and the second space are connected by a connecting structure.

[0119] Please refer to Figures 2 and 3; the arrows indicate the direction of gas flow. In Figure 2, the first fan assembly 1 is operating; in Figure 3, the second fan assembly 2 is operating.

[0120] In some embodiments, the connection structure includes a connecting pipe 5, which connects the first space and the second space. The second housing 10 near the third housing 11 and the third housing 11 near the second housing 10 each have a first connecting hole. The connecting pipe 5 connects the two first connecting holes, thus connecting the first space and the second space.

[0121] Optionally, the connecting pipe 5 is a flexible tube that connects the first space and the second space, allowing gas to flow directly between the two fans.

[0122] In some embodiments, please refer to Figure 4, the housings of the first fan assembly 1 and the second fan assembly 2 are an integral structure, specifically as follows:

[0123] The first fan assembly 1 includes a fifth housing 13, and the second fan assembly 2 includes a seventh housing 14;

[0124] A sixth housing 6 is installed between the fifth housing 13 and the seventh housing 14; a first space is formed between the sixth housing 6 and the fifth housing 13; a second space is formed between the sixth housing 6 and the seventh housing 14; a second connecting hole is provided on the sixth housing 6, configured to connect the first space and the second space. After the fifth housing 13, the sixth housing 6 and the seventh housing 14 are interconnected, the housings of the first fan assembly 1 and the second fan assembly 2 form an integral structure, and the first space and the second space are directly connected.

[0125] In some embodiments, referring to Figures 25-27, the sixth housing 6 has a first protrusion 20; the diameter of the fifth housing 13 is greater than the diameter of the seventh housing 14, and the diameter of the first protrusion 20 is greater than or equal to the diameter of the fifth housing 13; a connection space is formed between the first protrusion 20 and the fifth housing 13, and is configured to connect with the air guide layer 15.

[0126] Optionally, the air guide layer 15 includes an air bag. In this case, both the first protrusion 20 and the fifth housing 13 have longer portions that can be connected to the pressure-bearing air guide structure inside the air bag, making the connection between the fan and the air guide layer 15 more stable and reducing the possibility of detachment due to external force or prolonged use.

[0127] In some embodiments, a connector 7 is installed between the sixth housing 6 and the first fan assembly 1 and the second fan assembly 2, configured to fix the first fan assembly 1, the second fan assembly 2 and the sixth housing 6.

[0128] The direction of gas flow is indicated by the arrows in Figures 5 and 6. The operating mode of the two fan assemblies is the same as in the previous embodiment. In Figure 5, the first fan assembly 1 is operating; in Figure 6, the second fan assembly 2 is operating.

[0129] Optionally, the housings of the two fan assemblies are connected by a sixth housing 6. This connection method allows for a larger cross-section between the first space and the second space, which facilitates increased gas flow and improved ventilation.

[0130] It is understandable that when the housings of the two fans are connected, they may collide with each other due to vibration, generating noise. Therefore, in this embodiment, connector 7 is used to connect the housings of the first fan assembly 1 and the second fan assembly 2 respectively, so as to buffer vibration and reduce noise.

[0131] In some embodiments, referring to Figures 23-24, the position of the sixth housing 6 opposite the first fan assembly and the second fan assembly is not connected to the first space and the second space. The second through-hole 19 is located near the edge of the sixth housing 6 and connects to the first space and the second space.

[0132] It is understandable that the sidewalls of the fifth shell 13 and the seventh shell 14 are not connected to the outside world, so the gas can only enter the second space from the first space through the second through hole 19, or enter the first space from the second space.

[0133] In some embodiments, the connection structure includes a sealing ring and a fixing structure, wherein the first fan assembly 1 and the second fan assembly 2 are fixed to each other by the fixing structure; the sealing ring seals the gap between the first fan assembly 1 and the second fan assembly 2.

[0134] Optionally, the fixing structure can be a snap-fit ​​structure provided on the first fan assembly 1 and the second fan assembly 2, or it can be a rigid or soft fixing nail; the first fan assembly 1 and the second fan assembly 2 are snap-fitted to each other or fixed to each other by connecting rivets, and a sealing ring is provided between the housings of the two fan assemblies that abut against each other, which can effectively prevent air leakage from the connection between the housings of the two fan assemblies.

[0135] In some embodiments, the first fan assembly 1 includes a first impeller, and the second fan assembly 2 includes a second impeller; both the first impeller and the second impeller include fan blades 16; the dimensions of the first impeller and the second impeller, the length, thickness, and tilt angle of the fan blades 16 on the first impeller and the second impeller are different in at least one of the following:

[0136] It is understandable that, since the required ventilation effects differ between suction and blowing, simply changing the fan speed is insufficient to fully adapt. Therefore, in this embodiment, the size of the fan blades 16 of the first fan assembly 1 and the second fan assembly 2 is improved to make the fan blades 16 of the first fan assembly 1 and the second fan assembly 2 different in size, thereby coordinating and controlling the fan speed to achieve various different ventilation effects.

[0137] Optionally, the first fan assembly 1 and the second fan assembly 2 can be arranged facing each other, back to back, or in the same direction.

[0138] It is understandable that since the fan assembly requires corresponding circuitry to control the rotation of the fan blades 16, and these circuits are generally located on a circuit board, the fan assembly typically also includes a circuit board. In this embodiment, since there are two fan assemblies, there should generally be two circuit boards, and the circuit boards themselves have thickness.

[0139] It is worth mentioning that when the two fan assemblies are set back to back or in the same direction, the two circuit boards are stacked on top of each other, which will increase the overall structural thickness.

[0140] Therefore, in this embodiment, when the first fan assembly 1 and the second fan assembly 2 are arranged facing each other, they share a circuit board. This allows for the control of both fan assemblies using only one circuit board, reducing the overall thickness of the structure.

[0141] Optionally, the stator of the first fan assembly 1 and the stator of the second fan assembly 2 are offset from each other.

[0142] It is understandable that since the wires on the circuit board need to be connected to the stator of the fan assembly, when the stators of the two fan assemblies are coaxial, it will increase the difficulty of the circuit layout on the circuit board. In this embodiment, the stators of the two fan assemblies are staggered so that the wires on the circuit board can be staggered, reducing the difficulty of the circuit layout.

[0143] In one embodiment, the first fan assembly 1 uses a centrifugal fan, and the first air outlet 3 is opened at a lateral position of the first fan assembly 1, configured to allow the centrifugal fan in the first fan assembly 1 to blow gas laterally through the first air outlet 3.

[0144] In an optional embodiment, the selection of the fan in the second fan assembly 2 has two possibilities:

[0145] In the first scenario: the second air vent 4 is located at a lateral position of the second fan assembly 2; the second fan assembly 2 includes a centrifugal fan; the centrifugal fan is configured to blow gas laterally through the second air vent 4.

[0146] Understandably, this second fan assembly 2 is suitable for scenarios with limited space or passengers, perpendicular to the air guide layer 15. Lateral airflow avoids surrounding objects blocking the air vents.

[0147] The second scenario: Referring to Figure 10, the second air vent 4 is located at the axial position of the second fan assembly 2; the second fan assembly 2 includes an axial fan; the axial fan is configured to blow gas out along the axial direction through the second air vent 4.

[0148] Understandably, this second fan assembly 2 is suitable for scenarios where the space is narrow or obstructed by objects along the direction of the air guide layer 15. Axial air intake can prevent lateral objects from being drawn into the fan assembly under negative pressure, thus avoiding malfunctions.

[0149] In this case, the airflow direction under different fan operating modes is shown by the arrows in Figures 11 and 12. In Figure 11, the first fan assembly 1 is operating; in Figure 12, the second fan assembly 2 is operating.

[0150] Referring to Figures 15-17, the first fan assembly is equipped with a centrifugal fan and the second fan assembly is equipped with an axial fan. The arrows indicate the direction of gas movement.

[0151] In some embodiments, referring to FIG20, the first housing 9 and the second housing 10 of the first fan assembly, and the third housing 11 and the fourth housing 12 of the second fan assembly are simultaneously connected to a connecting portion 18. The connecting portion 18 is a rigid housing or an elastic connector. The elastic connector may be a rubber tube, a rubber interface, or a corrugated pipe. The connecting portion 18 communicates the first space and the second space.

[0152] Referring to Figures 20-22, both the first fan assembly 1 and the second fan assembly 2 are equipped with centrifugal fans; the connecting part 18 is a rigid shell with a hollow structure inside. The internal space is divided into two connected parts by a partition plate 17. The partition plate 17 is fixedly connected to the second shell 10 and the third shell 11, thereby making the two parts of the space inside the connecting part 18 connected to the first space and the second space, respectively.

[0153] It is understandable that when centrifugal fans are installed in both the first fan assembly 1 and the second fan assembly 2, the remaining parts of the first housing 9, second housing 10, third housing 11, and fourth housing 12 prevent the internal spaces of the first and second fan assemblies from communicating with the outside. The first space and the second space are connected only through the connecting part 18; so that the blown gas enters the other space only through the connecting part 18.

[0154] Referring to Figure 21, when the first fan assembly is working, gas enters the second space from the first space via the connecting part 18, achieving the suction function. Referring to Figure 22, when the second fan assembly is working, gas enters the first space from the second space via the connecting part 18, achieving the blowing function. In Figures 21-22, the arrows indicate the direction of gas movement.

[0155] This disclosure also provides an automotive seat ventilation system, including the aforementioned stacked fan structure.

[0156] Please refer to Figures 28-35. This disclosure provides a combined blade fan that integrates two fan components, namely a first blade fan component 35 and a second blade fan component 34. At the same time, by controlling the two fan components to work separately, the effect of switching between suction and blowing modes can be achieved by a single air outlet.

[0157] In addition, it features a bidirectional asymmetrical impeller, which has only one path for gas flow, making it less prone to air leakage; therefore, it has sufficient gas flow and can produce good ventilation.

[0158] Please refer to Figures 28-35. This disclosure provides a combined blade fan with bidirectional asymmetrical impellers, including:

[0159] The housing assembly 31 has a first space and a second space that are interconnected inside the housing assembly 31; the housing assembly 31 has a first airflow exchange port 33 and a second airflow exchange port 32; the first space is connected to the first airflow exchange port 33 and the second space is connected to the second airflow exchange port 32.

[0160] The first airflow exchange port 33 is larger than the second airflow exchange port 32; this facilitates increasing the gas flow rate.

[0161] A first leaf-dispensing fan assembly 35 and a second leaf-dispensing fan assembly 34 are installed in a first space; the second leaf-dispensing fan assembly 34 is installed in a second space; the first leaf-dispensing fan assembly 35 and the second leaf-dispensing fan assembly 34 operate independently.

[0162] When the first deflector fan assembly 35 is actively working, the gas flows from the side of the car seat closest to the occupant through the second air exchange port 32, the second space, the first space and the first air exchange port 33 to the side of the car seat away from the occupant, achieving the effect of suction.

[0163] When the second deflector fan assembly 34 is actively working, the gas flows from the side of the car seat away from the occupant, through the first air exchange port 33, the first space, the second space, and the second air exchange port 32 to the side of the car seat closer to the occupant, thus achieving a blowing effect.

[0164] The first blade fan assembly 35 includes a first impeller 37; the second blade fan assembly 34 includes a second impeller 36.

[0165] The first impeller 37 and the second impeller 36 have different thicknesses along the direction of their rotation axes.

[0166] The first airflow exchange port 33 is connected to the rear cavity inside the car seat, and the second airflow exchange port 32 is connected to the ventilation components inside the car seat that are configured to connect the side of the car seat closest to the occupant and the side furthest from the occupant.

[0167] In this embodiment, the thickness of the first impeller 37 along its rotation axis is greater than the thickness of the second impeller 36 along its rotation axis.

[0168] In this embodiment, the blade fan assembly includes: an external housing assembly 31, a stator fixedly installed in the internal space of the housing assembly 31, an impeller (as a rotor) installed in the internal space of the housing assembly 31, and a circuit board electrically connected to the stator via pins.

[0169] Understandably, when the widths of the first impeller 37 and the second impeller 36 are the same, the first impeller 37, being thicker, generates a larger airflow during rotation, resulting in greater comfort for the occupants.

[0170] In this embodiment, controlling the two fan assemblies separately during operation can perform both suction and blowing functions, resulting in a simple and convenient structure.

[0171] In this embodiment, the design of the two sets of fan assembly impellers includes:

[0172] The length of the first impeller 37 in the direction perpendicular to the axis of rotation is less than the length of the second impeller 36 in the direction perpendicular to the axis of rotation.

[0173] Referring to Figure 30, the first impeller 37 is thick but the second impeller 36 is wide. The purpose of this structure is to increase the circumference of the second airflow exchange port 32. With the same thickness of the second impeller 36, the longer the length, the larger the port for exchanging airflow with the outside, and the higher the ventilation efficiency.

[0174] Understandably, the thicker first impeller 37 of the first blade fan assembly 35 can drive more gas movement during rotation, thereby increasing gas flow and improving ventilation.

[0175] It's worth noting that existing suction fans are all positioned with their backs to the occupants. The air must pass through vents in the car seat support layer and the air guide layer 311 before entering the fan and finally being exhausted to the outside. This long airflow path results in a relatively low air volume during suction, leading to poor suction performance.

[0176] In this embodiment, the first airflow exchange port 33 is larger than the second airflow exchange port 32, which is configured to increase the gas flow rate during suction, ultimately resulting in higher suction efficiency.

[0177] Optionally, both the second impeller 36 and the first impeller 37 are centrifugal structures with blades, and the second impeller 36 and the first impeller 37 rotate in opposite directions, driving the gas to move in opposite directions; the second air exchange port 32 and the first air exchange port 33 are both located on the side wall of the housing assembly 31.

[0178] Based on the above structural design, when the centrifugal impeller rotates, it drives the gas from one side of the rotating shaft to the outside of the impeller to complete the function of driving airflow. Moreover, the first impeller 37 is located near the first airflow exchange port 33; the second impeller 36 is located near the second airflow exchange port 32. When the air moves, it will move to the outside of the housing assembly 31 through the first airflow exchange port 33 and the second airflow exchange port 32 respectively.

[0179] Because the first airflow exchange port 33 is located inside the car seat on the side away from the occupant, while the second airflow exchange port 32 is located inside the car seat on the side closer to the occupant; and because there is a rear cover behind the car seat on the side away from the occupant, forming a cavity between the car seat and the rear cover for airflow, the above structural design enables both suction and blowing functions to be completed when the two fan assemblies are controlled to operate separately.

[0180] Optionally, housing assembly 31 includes:

[0181] The upper shell 313, middle shell 314, and lower shell 315 are interconnected; a first space is formed between the upper shell 313 and the middle shell 314; a second space is formed between the middle shell 314 and the lower shell 315. The upper shell 313, middle shell 314, and lower shell 315 are interlocked, and a first airflow exchange port 33 is formed between the edges of the upper shell 313 and the middle shell 314; a second airflow exchange port 32 is formed between the edges of the middle shell 314 and the lower shell 315.

[0182] Optionally, the outer side wall of the middle housing 314 has a second protrusion 38, which is configured to connect with the support layer 39 to fix the relative position of the housing assembly 31 and the support layer 39.

[0183] In this embodiment, since the ventilation system is installed on the car seat, the fan can be fixed on the car seat to facilitate the function of suction or blowing air.

[0184] In a first embodiment, referring to FIG29, the housing assembly 31 has an annular sheet-like second protrusion 38.

[0185] In the second embodiment, referring to FIG30, the second protrusion 38, as shown, can increase the connection area and improve the stability of the connection.

[0186] Referring to Figure 31, the first impeller 37 in the first blade fan assembly 35 is wider than the second impeller 36 in the second blade fan assembly 34; thus, the first airflow exchange port 33 is also larger than the second airflow exchange port 32.

[0187] Referring to Figure 31, the second protrusion 38 is located on the side of the middle housing 314 near the first airflow exchange port 33 and on the side near the second airflow exchange port 32, respectively. When the second protrusion 38 is near the second airflow exchange port 32, the second protrusion 38 protrudes from the upper housing 313.

[0188] Based on the above structural design, the second protrusion 38 can be easily connected to air guides of various structures.

[0189] The shape of the additional protrusion structure on the second protrusion 38 can be varied, as shown in Figure 31. When connecting to other parts, the shape of the second protrusion 38 can be freely selected to facilitate connection according to the shape of other parts, and the installation can be completed.

[0190] The position of the second protrusion 38 on the middle housing 314 can be designed according to actual needs, as long as it is between the second airflow exchange port 32 and the first airflow exchange port 33.

[0191] Referring to Figure 32, it is a structural diagram of another embodiment of the second protrusion 38 and a schematic diagram of it being mounted on the support layer 39.

[0192] Referring to Figures 33-34, there is a structural diagram of another embodiment of the second protrusion 38 and a schematic diagram of it being mounted on the support layer 39.

[0193] The three embodiments illustrate various structural designs of the second protrusion 38, which are configured to connect to the side of the car seat support layer 39 away from the occupant, and the relative position between the fan and the seat can be fixed through various different connection methods.

[0194] In some embodiments, referring to FIG35, the diameter of the lower housing 315 is greater than the diameter of the upper housing 313, and the diameter of the second protrusion 38 is greater than or equal to the diameter of the lower housing 315; a connecting space is formed between the second protrusion 38 and the lower housing 315. The lower housing is configured to connect with the air guide layer 311, fixing the relative position between the housing assembly 31 and the air guide layer 311; making the connection between the housing assembly 31 and the air guide layer 311 more stable, so as to reduce the occurrence of detachment due to external force or long-term use.

[0195] In order to be fixedly connected to the air guide layer 311, a connection space is formed between the second protrusion 38 and the lower housing 315. Therefore, the diameter of the second protrusion 38 is set to be greater than or equal to the diameter of the lower housing 315.

[0196] Both suction and blowing have their advantages and disadvantages.

[0197] Advantages of suction: gentle airflow and fast cooling rate; Disadvantages: weak airflow.

[0198] Advantages of the airflow: strong airflow; Disadvantages: the seat back ventilation system blows out hot air when it starts working.

[0199] The fan disclosed herein can be used to manually switch between blowing and suction modes, or the blowing and suction modes can be automatically switched through system control.

[0200] You can first use suction to quickly cool down the air by taking advantage of its large air volume; then use blowing to enhance the airflow.

[0201] This disclosure also provides an automotive seat including a combined blade fan with a bidirectional asymmetrical impeller as described in the above embodiments.

[0202] This disclosure provides a car seat, comprising:

[0203] Combined blade fan;

[0204] The support layer 39 is configured to connect the space near the occupant and the space away from the occupant; the support layer 39 is provided with an air guide on the side away from the occupant; the housing assembly 31 is connected to the air guide, and the second air exchange port 32 is connected to the internal space of the air guide.

[0205] Optionally, the air guide section includes an air guide layer 311 and an air bag membrane 312, with the air bag membrane 312 covering the air guide layer 311. An installation groove 310 is provided on the air guide layer 311, and the housing assembly 31 is disposed in the installation groove 310. The second airflow exchange port 32 is connected to the internal space of the air guide layer 311. The side of the air bag membrane 312 near the support layer 39 has ventilation holes, which are connected to the ventilation duct 316. The side of the air bag membrane 312 away from the support layer 39 has a first installation hole corresponding to the installation groove 310, configured to accommodate the housing assembly 31.

[0206] Optionally, the air guide includes an air guide groove, which is connected to the ventilation duct 316. A sealing layer is provided on the side of the air guide groove away from the support layer 39. A second mounting hole is provided on the sealing layer. The housing assembly 31 is disposed in the air guide groove through the second mounting hole, and the second air exchange port 32 is connected to the internal space formed by the air guide groove and the sealing layer.

[0207] Referring to Figures 36-38, this disclosure also provides a dual-sided independent split-drive fan, integrating two fan assemblies, namely a first fan assembly 42 and a second fan assembly 43; by controlling the two fan assemblies to operate independently, the effect of switching between suction and blowing modes at a single air outlet can be achieved. Simultaneously, the first fan assembly 42 and the second fan assembly 43 are controlled separately via a control circuit board.

[0208] Please refer to Figures 36-37. This disclosure also provides a dual-sided independent split-drive fan, including:

[0209] Mounting housing 41, the mounting housing 41 has a first mounting space and a second mounting space stacked in a first direction; a first fan assembly 42 is disposed in the first mounting space and a second fan assembly 43 is disposed in the second mounting space; the first fan assembly 42 and the second fan assembly 43 both have a first state and a second state.

[0210] A control circuit board 44 is disposed between the first fan assembly 42 and the second fan assembly 43. The control circuit board 44 has a first side and a second side that are far apart from each other. The first side corresponds to the first fan assembly 42 and is electrically connected to the first fan assembly 42. The second side corresponds to the second fan assembly 43 and is electrically connected to the second fan assembly 43. The control circuit board 44 is configured to control the first fan assembly 42 or the second fan assembly 43 respectively, so that when the first fan assembly 42 is in a first state, the second fan assembly is in a second state, or when the first fan assembly 42 is in a first state, the second fan assembly 43 is in a second state.

[0211] The first direction is the vertical direction shown in the diagram.

[0212] In this embodiment, the mounting shell 41 includes a first cover 45, a second cover 46, and a connecting shell 47. The connecting shell 47 is disposed between the first cover 45 and the second cover 46, dividing the space inside the mounting shell 41 into a first mounting space and a second mounting space. The first mounting space is formed between the first cover 45 and the connecting shell 47, and the second mounting space is formed between the second cover 46 and the mounting shell 41.

[0213] Optionally, referring to Figure 38, the connecting housing 47 can be a split structure, which includes a first connecting plate 419 and a second connecting plate 420 arranged in a row, with the first connecting plate 419 close to the first cover 45 and the second connecting plate 420 close to the second cover 46. A first mounting space is formed between the first connecting plate 419 and the first cover 45, and a second mounting space is formed between the second connecting plate 420 and the second cover 46.

[0214] In this embodiment, a first fan assembly 42 is disposed in a first installation space, and a second fan assembly 43 is disposed in a second installation space; both the first fan assembly 42 and the second fan assembly 43 have a first state and a second state.

[0215] In this embodiment, the first fan assembly 42 includes a first motor 422 and a first impeller 410. The first motor 422 has a first output shaft 411, and the first impeller 410 and the first output shaft 411 are coaxially fixedly connected. The first motor 422 drives the first output shaft 411 to rotate, thereby driving the first impeller 410 to rotate.

[0216] Optionally, the first installation space is provided with a first opening 48 communicating with it in the circumferential direction, a first ventilation space is formed inside the first impeller 410, a plurality of first air inlets and outlets 412 communicating with the first ventilation space are evenly provided in the circumferential direction of the first impeller 410, and a second air inlet and outlet 413 communicating with the first ventilation space is provided on the side of the first impeller 410 near the first output shaft 411, and the second air inlet and outlet 413 is communicating with the first installation space.

[0217] In this embodiment, the second fan assembly 43 includes a second motor 423 and a second impeller 414. The second motor 423 has a second output shaft 415, and the second impeller 414 and the second output shaft 415 are coaxially and fixedly connected. The second motor 423 drives the second output shaft 415 to rotate, thereby causing the second impeller 414 to rotate.

[0218] Optionally, the second installation space is provided with a second opening 49 communicating with it in the circumferential direction, the second impeller 414 forms a second ventilation space inside, the second impeller 414 is provided with a plurality of third air inlets and outlets 416 communicating with the second ventilation space in the circumferential direction, and the second impeller 414 is provided with a fourth air inlet and outlet 417 communicating with the second ventilation space on the side near the second output shaft 415, and the fourth air inlet and outlet 417 is communicating with the second installation space;

[0219] It should be noted that, referring to Figures 36-37, the first air inlet / outlet 412 and the third air inlet / outlet 416 are arranged close to each other in the first direction, that is, the first impeller 410 and the second impeller 414 are in the upright position.

[0220] When the first fan assembly 42 is in the first state, the first motor 422 drives the first impeller 410 to rotate. At this time, the second fan assembly 43 is in the second state, and the second motor 423 does not work.

[0221] When the second fan assembly 43 is in the first state, the second motor 423 drives the second impeller 414 to rotate. At this time, the first fan assembly 42 is in the second state and the first motor 422 does not work. A through hole 418 is provided on the connecting housing 47 to allow airflow to pass through.

[0222] Therefore, when the first fan assembly 42 is in the first state, the first motor 422 drives the first impeller 410 to rotate, and the second motor 423 does not work. As a result, the outside airflow enters the second ventilation space through the third air inlet and outlet 416, then enters the second installation space through the fourth air inlet and outlet 417, enters the first installation space through the through hole 418, then enters the first ventilation space through the second air inlet and outlet 413, and finally is discharged to the outside through the first air inlet and outlet 412.

[0223] When the second fan assembly 43 is in the first state, the second motor 423 drives the second impeller 414 to rotate, and the first motor 422 does not work. As a result, the outside airflow enters the first ventilation space through the first air inlet and outlet 412, then enters the first installation space through the second air inlet and outlet 413, enters the second installation space through the through hole 418, then enters the second ventilation space through the fourth air inlet and outlet 417, and is then discharged to the outside through the third air inlet and outlet 416.

[0224] It should be noted that when the first fan assembly 42 and the second fan assembly 43 are in the first state, the second impeller 414 and the first impeller 410 may rotate under the influence of airflow.

[0225] Optionally, the first motor 422 and the second motor 423 can be coreless motors or ordinary motors.

[0226] In this embodiment, a control circuit board 44 is disposed between the first fan assembly 42 and the second fan assembly 43.

[0227] Optionally, the control circuit board 44 can be located in the first mounting space or in the second mounting space.

[0228] Optionally, the control circuit board 44 has a first side and a second side that are far apart from each other. The first side corresponds to and is electrically connected to the first fan assembly 42, and the second side corresponds to and is electrically connected to the second fan assembly 43. The control circuit board 44 is configured to control the first fan assembly 42 or the second fan assembly 43 respectively, so that when the first fan assembly 42 is in a first state, the second fan assembly 43 is in a second state, or when the first fan assembly 42 is in a first state, the second fan assembly 43 is in a second state.

[0229] Optionally, referring to Figures 36-37, the connecting housing 47 can be an integral structure, which includes a third connecting plate 421;

[0230] Optionally, when the connecting housing 47 is an integral structure, the control circuit board 44 is disposed on the third connecting plate 421, and the first side and the second side are respectively configured to control the first fan assembly 42 and the second fan assembly 43.

[0231] Optionally, referring to Figures 36-37, the first air inlet / outlet 412 and the third air inlet / outlet 416 are arranged close to each other in the first direction. In order to achieve airflow, a second air inlet / outlet 413 is opened on the side of the first impeller 410 near the first output shaft 411, and a fourth air inlet / outlet 417 is opened on the side of the second impeller 414 near the second output shaft 415.

[0232] Therefore, when the first fan assembly 42 is in the first state, the outside airflow is drawn in through the second opening 49, and then passes through the third air inlet / outlet 416, the fourth air inlet / outlet 417, the through hole 418, the second air inlet / outlet 413 and the first air inlet / outlet 412 in sequence, and is blown out through the first opening 48; the arrow in Figure 36 indicates the direction of airflow.

[0233] When the second fan assembly 43 is in the first state, the outside airflow is drawn in through the first opening 48, and then passes through the first air inlet / outlet 412, the second air inlet / outlet 413, the through hole 418, the fourth air inlet / outlet 417 and the third air inlet / outlet 416 in sequence, and is blown out through the second opening 49; the arrow in Figure 37 indicates the direction of airflow.

[0234] Optionally, referring to Figure 38, the first air inlet / outlet 412 and the third air inlet / outlet 416 are arranged far apart in the first direction. In this case, the first impeller 410 and the second impeller 414 are in reverse configuration compared to Figure 36, and it is not necessary to open the second air inlet / outlet 413 and the fourth air inlet / outlet 417.

[0235] It is understandable that when the first fan assembly 42 or the second fan assembly 43 is in the first state, the airflow passes through the first air inlet / outlet 412 or the second air inlet / outlet 413 and then directly through the through hole 418 to achieve ventilation.

[0236] It should be noted that, as shown in Figure 38, the first impeller 410 and the second impeller 414 can also be installed in reverse on the hollow cup motor. The reverse installation of the first impeller 410 and the second impeller 414 can make the airflow path smoother, and make the blowing and suction effects of the first fan assembly 42 and the second fan assembly 43 better.

[0237] It should be noted that the first impeller 410 and the second impeller 414 are different, which can be that the first impeller 410 and the second impeller 414 are different in size or shape, that is, the length, thickness, and tilt angle of the blades of the first impeller 410 and the second impeller 414 are different in at least one aspect.

[0238] Working principle: This device is installed in a car seat and controls the first fan assembly 42 and the second fan assembly 43 separately through the control circuit board 44. When the first fan assembly 42 is in the first state, the second fan assembly 43 is in the second state, and vice versa. That is, when the first fan assembly 42 is working, it blows air and draws air through the second fan assembly 43; when the second fan assembly 43 is working, it blows air and draws air through the first fan assembly 42. This allows for the selection of the blowing and drawing modes of the car seat, enabling effective air circulation on the seat surface in the required environment and avoiding discomfort caused to the human body by a single mode.

[0239] Referring to Figures 39-40, this disclosure also proposes an ultra-thin, dual-sided, independently driven fan, integrating two air guide sections, namely a first air guide section 51 and a second air guide section 52. Simultaneously, by controlling the independent operation of the two air guide sections, the effect of switching between suction and blowing modes at a single air outlet can be achieved. Furthermore, the stacked arrangement of the two impellers effectively reduces the fan's thickness and size, thereby improving its installation adaptability.

[0240] Please refer to Figures 39-40. This disclosure provides an ultra-thin dual-sided independent split fan configured for seat ventilation 523, including:

[0241] The mounting housing has a first mounting space and a second mounting space that are coaxially stacked and interconnected inside. The outer periphery of the mounting housing is provided with a first air guide 51 that communicates with the first mounting space and a second air guide 52 that communicates with the second mounting space.

[0242] A pair of impellers 53 are respectively rotatably installed in the first installation space and the second installation space; the impeller 53 in the first installation space and the first air guide 51 form a first blowing and suction unit, and the impeller 53 in the second installation space and the second air guide 52 form a second blowing and suction unit.

[0243] The circumferential flux drive mechanism and the axial flux drive mechanism are configured to independently drive a pair of impellers 53 to rotate.

[0244] In this embodiment, a first mounting space and a second mounting space are formed inside the mounting housing along the axial direction. The first and second mounting spaces are stacked and interconnected. An impeller 53 is rotatably mounted in each of the first and second mounting spaces. The two impellers 53 located in the first and second mounting spaces are coaxially arranged and are driven to rotate by an axial magnetic flux drive mechanism. The first air guide 51 consists of multiple openings formed on the outer periphery of the mounting housing, distributed around the first mounting space and communicating with it. The second air guide 52 consists of multiple openings formed on the outer periphery of the mounting housing, distributed around the second mounting space and communicating with it.

[0245] In this embodiment, the fan provided by this disclosure has different operating modes, and can achieve either suction or blowing effects by driving the two impellers 53 respectively. When only the impeller 53 in the first mounting space is driven to rotate, the impeller 53 in the first mounting space is configured to draw air from outside the mounting housing into the first mounting space through the first air guide 51, and then guide it into the second mounting space. The impeller 53 in the second mounting space moves or remains stationary, and the air in the second mounting space is blown out by the second air guide 52, thereby achieving the effect of suction at the first air guide 51 and blowing at the second air guide 52. When only the impeller 53 in the second mounting space is driven to rotate, under the driving action of the impeller 53, air from outside the mounting housing is drawn into the first mounting space through the first air guide 51. The impeller 53 in the first mounting space moves or remains stationary, and then the air is guided from the first mounting space to the second mounting space and blown out by the second air guide 52, which can also achieve the effect of suction at the first air guide 51 and blowing at the second air guide 52.

[0246] Optionally, the impeller 53 includes a convex first working surface 531 and a concave second working surface 532, with the first working surfaces 531 of a pair of impellers 53 arranged close to each other.

[0247] Optionally, the impeller 53 includes a convex surface and a concave surface, wherein the convex surface is the front surface and serves as the first working surface 531, and the concave surface is the back surface and serves as the second working surface 532; both the first working surface 531 and the second working surface 532 of the impeller 53 are provided with a ring of reinforcing ribs 526, and multiple grooves 527 are formed on the reinforcing ribs 526 along the circumferential direction; the second working surface 532 of the impeller 53 is provided with a first air inlet 517, and multiple second air inlets 518 are formed on the outer circumference of the impeller 53, and the second air inlets 518 communicate with the first air inlets 517. The first air inlets 517 of the impeller 53 in the first installation space and the first air inlets 517 of the impeller 53 in the second installation space are correspondingly arranged, the second air inlets 518 of the impeller 53 in the first installation space are correspondingly arranged at the position of the first air guide 51, and the second air inlets 518 of the impeller 53 in the second installation space are correspondingly arranged at the position of the second air guide 52.

[0248] In this embodiment, the first working surfaces 531 of a pair of impellers 53 are arranged close to each other. When the impellers 53 in the first mounting space rotate, air enters through the second air inlet 518 of the impellers 53 in the second mounting space and exits through the first air inlet 517 of the impellers 53 in the second mounting space. Then, air enters through the first air inlet 517 of the impellers 53 in the first mounting space and exits through the second air inlet 518 of the impellers 53 in the first mounting space. Thus, the impellers 53 in the first mounting space and the first air guide 51 form a blowing unit, and the impellers 53 in the second mounting space... The impeller 53 in the second mounting space forms an air intake unit with the second air guide 52. When the impeller 53 in the second mounting space rotates, air enters through the second air inlet 518 of the impeller 53 in the first mounting space and exits through the first air inlet 517 of the impeller 53 in the first mounting space. Then, the air enters through the first air inlet 517 of the impeller 53 in the second mounting space and exits through the second air inlet 518 of the impeller 53 in the second mounting space. Thus, the impeller 53 in the second mounting space and the second air guide 52 form a blowing unit, and the impeller 53 in the first mounting space and the first air guide 52 form an air intake unit.

[0249] Air enters through the first air vent 517 and exits through the second air vent 518. In this embodiment, the fan is a pair of impellers 53 facing each other.

[0250] The fan provided in this embodiment can achieve air intake and air blowing effects at any position around the fan, which can meet the air intake and air blowing requirements of the seat 523 ventilation system. Since the two impellers 53 in the fan provided in this embodiment are coaxially stacked, the air intake and air blowing effects of the fan are increased, thereby meeting the cooling efficiency requirements of the seat 523 ventilation system. In addition, the stacking of the two impellers 53 in the mounting housing effectively reduces the thickness of the mounting housing, making it easier to configure the fan into the seat 523 ventilation system and meeting the requirements of fan miniaturization.

[0251] Please refer to Figure 41. Point A in Figure 41 shows the fan provided in this embodiment. The fan provided in this embodiment ventilates the seat 523 by being installed on the car seat 523. Half of the fan is placed inside the air bag on the seat 523, and the other half is placed outside the seat 523. The fan can be directly fixed to the seat 523, or it can be fixed to the seat spring frame 524 by means of a rivet 525. The seat spring frame 524 is fixed to the seat 523. In this embodiment, the fan embedded in the air bag acts as a blowing fan, and the seat 523 ventilation is in blowing mode when it is turned on; the fan located outside the air bag acts as a suction fan, and the seat 523 ventilation is in suction mode when it is turned on.

[0252] Optionally, the mounting housing includes a central housing 55 and a pair of first housings 54, the pair of first housings 54 being respectively disposed on both sides of the central housing 55, a first mounting space being formed between one of the first housings 54 and the central housing 55, and a second mounting space being formed between the other first housing 54 and the central housing 55; the central housing 55 is provided with a ventilation section 56 configured to connect the first mounting space and the second mounting space.

[0253] In this embodiment, the central housing 55 is a one-piece structure. Multiple snap-fit ​​holes are provided on the outer periphery of the central housing 55. Snap-fit ​​posts are provided on the outer periphery of the first housing 54 corresponding to the snap-fit ​​holes. The first housing 54 can be installed on both sides of the central housing 55 through the cooperation of the snap-fit ​​posts and snap-fit ​​holes. The central housing 55, in cooperation with the first housings 54 on both sides, forms a first installation space and a second installation space on both sides of the central housing 55, respectively. A ventilation section 56 is provided at the center of the central housing 55, extending through both sides of the central housing 55 to connect the first installation space and the second installation space. In this embodiment, making the central housing 55 a one-piece structure effectively reduces the overall thickness of the fan, thereby improving the adaptability of the fan during installation.

[0254] In this embodiment, since the convex surfaces of the two impellers 53 are arranged close to each other, the side of the pair of first housings 54 near the impellers 53 is set as a plane to accommodate the installation of the impellers 53.

[0255] Optionally, the axial flux drive mechanism includes:

[0256] A pair of drive shafts 57 are respectively installed in the first installation space and the second installation space via a pair of rotating components 512. The drive shafts 57 are coaxially arranged and fixedly connected to the impeller 53.

[0257] The drive unit is mounted on a pair of drive shafts 57 and is configured to drive the pair of drive shafts 57 independently.

[0258] Optionally, the axial flux drive mechanism includes a drive device and a pair of drive shafts 57. The pair of drive shafts 57 are coaxially arranged and rotatably mounted in the first mounting space and the second mounting space, respectively. In this embodiment, the end of the drive shaft 57 near the first housing 54 achieves relative rotation with the first housing 54 through a rotating assembly 512. The drive shaft 57 and the rotating assembly 512 are rotatably connected, and the rotation direction is around the axis of the drive shaft 57. The rotating assembly 512 is sleeved on the drive shaft 57. The end of the drive shaft 57 near the central housing 55 achieves relative rotation with the central housing 55 through a copper cap 20. The drive shaft 57 and the copper cap 20 are rotatably connected, and the rotation direction is around the axis of the drive shaft 57. The drive shaft 57 and the impeller 53 are coaxially arranged and fixed to each other. In this embodiment, since the pair of impellers 53 are arranged face to face, the drive device is mounted on the central housing 55. The drive device is respectively sleeved on the pair of drive shafts 57. The drive device can independently drive the pair of drive shafts 57 to rotate, thereby driving the pair of impellers 53 to rotate.

[0259] Optionally, the drive device includes two drive units, each configured to drive a pair of drive shafts 57. Each drive unit includes:

[0260] Circuit board 58;

[0261] Hollow coil 59 is mounted on circuit board 58 and sleeved on the corresponding drive shaft 57. Hollow coil 59 is electrically connected to circuit board 58.

[0262] A rotating magnet 510 is located on the side of the hollow coil 59 away from the circuit board 58, and is sleeved on the corresponding drive shaft 57 and fixed to the drive shaft 57.

[0263] In this embodiment, the driving device includes two driving units, each including a circuit board 58, a hollow coil 59, and a rotating magnet 510. In this embodiment, the circuit board 58 is sleeved on the outside of the rotating assembly 512, and then on the drive shaft 57. The hollow coil 59 is mounted on and electrically connected to the circuit board 58, located on the side of the circuit board 58 near the central housing 55. The hollow coil 59 is also sleeved on the outside of the rotating assembly 512. The rotating magnet 510 is located on the side of the hollow coil 59 near the central housing 55 and is sleeved on the drive shaft 57. The rotating magnet 510 is fixedly connected to the drive shaft 57 via a rotor frame 516 (see attached figure for rotor frame 516). After the hollow coil 59 is energized by the circuit board 58, the magnetic field generated by the hollow coil 59 drives the rotating magnet 510 to rotate around the axis of the drive shaft 57, achieving the driving effect of axial magnetic flux, thereby driving the drive shaft 57 and the impeller 53 to rotate. In this embodiment, the rotating magnet 510 can be a neodymium iron boron magnet. The hollow coil 59 is chosen for driving in this embodiment because it works in conjunction with the rotating magnet 510 to achieve axial magnetic flux driving. In this embodiment, the two sets of hollow coils 59 are controlled by two circuit boards 58, and the on / off state of the two hollow coils 59 does not affect each other.

[0264] Optionally, the rotating assembly 512 includes:

[0265] The copper tube 513 is coaxially arranged with the drive shaft 57. The copper tube 513 is hollow inside and connected at both ends.

[0266] A pair of bearings 514 are disposed inside the copper tube 513 and sleeved on the drive shaft 57. The inner ring of the bearing 514 is fixedly connected to the side wall of the drive shaft 57.

[0267] Optionally, the rotating assembly 512 includes a copper tube 513 and a pair of bearings 514. The copper tube 513 is hollow inside and connected at both ends. The pair of bearings 514 are installed inside the copper tube 513 and distributed near both ends of the copper tube 513. The outer ring of the bearing 514 is snapped into the copper tube 513, and the inner ring of the bearing 514 is sleeved on the drive shaft 57 and fixed to the drive shaft 57. In this embodiment, the copper tube 513 is fixedly installed on the first housing 54. By setting the rotating assembly 512, the resistance to rotational friction between the drive shaft 57 and the first housing 54 is reduced, and the rotational efficiency is higher. The drive shaft 57 and the copper tube 513 are also connected by a C-ring 519.

[0268] Optionally, the rotating assembly 512 further includes a preloaded elastic element 515 disposed between a pair of bearings 514, the preloaded elastic element 515 pressing the bearings 514 to eliminate clearance between the balls inside the bearings 514 and the inner and outer rings.

[0269] Optionally, the inner ring of the bearing 514 at the end of the copper tube 513 near the copper cap 20 abuts against the copper cap 20. A protrusion 521 is provided at the position of the copper tube 513 near the copper cap 20. The protrusion 521 abuts against the outer ring of the bearing 514 at the end of the copper tube 513 near the copper cap 20. The protrusion 521 is elastic. The inner ring of the bearing 514 at the end of the copper tube 513 away from the copper cap 20 abuts against the C retaining ring 519. The preload elastic element 515 is telescopic along the extension direction of the drive shaft 57. Optionally, the preload elastic element 515 is a spring. One end of the preload elastic element 515 abuts against the outer ring of the bearing 514 away from the copper cap 20, and the other end abuts against the protrusion 521. The preload elastic element 515 is squeezed in the copper tube 513, so that the preload elastic element 515 applies pressure to both ends, thereby causing the inner ring and outer ring of the two bearings 514 to be misaligned, reducing the clearance between the balls in the bearing 514 and the inner and outer rings, ensuring that the balls in the bearing 514 can effectively contact the inner and outer rings, and achieving the purpose of low vibration and low noise.

[0270] The above description is merely a preferred embodiment of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the disclosed concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features disclosed in this disclosure that have similar functions. Industrial applicability

[0271] This disclosure achieves the effect of switching between suction and blowing modes at a single air vent by integrating two fan assemblies together and controlling their independent operation. The internal structure of this method is simple, reducing the likelihood of air leakage; it also eliminates the need for an additional switching motor, reducing the space required for motor installation and lowering the overall structural weight; furthermore, it provides sufficient airflow, resulting in excellent ventilation.

Claims

1. A stacked fan structure, characterized in that, include: A first fan assembly (1) has a first air vent (3) and a first space inside; The first space is connected to the first air vent (3); The second fan assembly (2) has a second air vent (4) and a second space inside; the second space is connected to the second air vent (4); The first fan assembly (1) and the second fan assembly (2) are interconnected, and the first space is connected to the second space; When the first fan assembly (1) is actively working and the second fan assembly (2) is not working, the second air vent (4) serves as the air intake and the first air vent (3) serves as the air outlet; the gas flows sequentially through the second air vent (4), the second space, the first space and the first air vent (3); When the second fan assembly (2) is actively working and the first fan assembly (1) is not working, the first air vent (3) serves as the air intake and the second air vent (4) serves as the air outlet; the gas flow direction passes through the first air vent (3), the first space, the second space and the second air vent (4) in sequence.

2. The stacked fan structure according to claim 1, characterized in that, The first fan assembly (1) includes a first housing (9) and a second housing (10), and the first space is formed between the first housing (9) and the second housing (10); The second fan assembly (2) includes a third housing (11) and a fourth housing (12), with the second space formed between the third housing (11) and the fourth housing (12); The second housing (10) and the third housing (11) are connected by a connecting structure; The second housing (10) near the third housing (11) and the third housing (11) near the second housing (10) are both provided with a first connecting hole. The connecting structure connects the two first connecting holes and is configured to connect the first space and the second space.

3. The stacked fan structure according to claim 2, characterized in that, The connection structure includes a connecting pipe (5), which connects the first space and the second space.

4. The stacked fan structure according to any one of claims 1-3, characterized in that, The first fan assembly (1) includes a fifth housing (13), and the second fan assembly (2) includes a seventh housing (14); A sixth housing (6) is installed between the fifth housing (13) and the seventh housing (14); the sixth housing (6) and the fifth housing (13) form the first space; the sixth housing (6) and the seventh housing (14) form the second space; the sixth housing (6) is provided with a second connecting hole, configured to connect the first space and the second space.

5. A stacked fan structure according to claim 4, characterized in that, The sixth housing (6) is connected to the first fan assembly (1) and the second fan assembly (2) by connectors (7), which are configured to fix the first fan assembly (1), the second fan assembly (2) and the sixth housing (6).

6. The stacked fan structure according to claim 5, characterized in that, The sixth housing (6) has a first protrusion (20); the diameter of the fifth housing (13) is greater than the diameter of the seventh housing (14), and the diameter of the first protrusion (20) is greater than or equal to the diameter of the fifth housing (13); a connection space is formed between the first protrusion (20) and the fifth housing (13), and is configured to connect with the air guide layer (15).

7. The stacked fan structure according to any one of claims 2-6, characterized in that, The connection structure includes a sealing ring and a fixing structure. The first fan assembly (1) and the second fan assembly (2) are fixed to each other by the fixing structure, and the gap between the first fan assembly (1) and the second fan assembly (2) is sealed by the sealing ring.

8. The stacked fan structure according to any one of claims 1-7, characterized in that, The first fan assembly (1) includes a first impeller, and the second fan assembly (2) includes a second impeller; both the first impeller and the second impeller include fan blades (16); the size of the first impeller and the second impeller, the length, thickness and tilt angle of the fan blades (16) on the first impeller and the second impeller are different in at least one of the following:

9. The stacked fan structure according to any one of claims 1-8, characterized in that, The first fan assembly (1) and the second fan assembly (2) share a circuit board.

10. The stacked fan structure according to claim 9, characterized in that, The stator of the first fan assembly (1) and the stator of the second fan assembly (2) are offset from each other.

11. A combined blade fan with bidirectional asymmetrical impellers, configured as a ventilation system for a car seat, characterized in that, include: The housing assembly (31) has a first space and a second space that are interconnected inside; the housing assembly (31) has a first airflow exchange port (33) and a second airflow exchange port (32); the first space is connected to the first airflow exchange port (33), and the second space is connected to the second airflow exchange port (32); A first leaf-dispensing fan assembly (35) and a second leaf-dispensing fan assembly (34), wherein the first leaf-dispensing fan assembly (35) is installed in the first space; the second leaf-dispensing fan assembly (34) is installed in the second space; the first leaf-dispensing fan assembly (35) and the second leaf-dispensing fan assembly (34) operate independently. When the first deflector fan assembly (35) is actively working, gas flows from the side of the car seat near the occupant, through the second airflow exchange port (32), the second space, the first space and the first airflow exchange port (33) to the side of the car seat away from the occupant; When the second deflector fan assembly (34) is actively working, gas flows from the side of the car seat away from the occupant, through the first airflow exchange port (33), the first space, the second space and the second airflow exchange port (32) to the side of the car seat near the occupant; The first blade fan assembly (35) includes a first impeller (37); the second blade fan assembly (34) includes a second impeller (36); The first impeller (37) and the second impeller (36) have different thicknesses along the direction of their rotation axes.

12. A combined blade fan with a bidirectional asymmetrical impeller according to claim 11, characterized in that, The thickness of the first impeller (37) along its axis of rotation is greater than the thickness of the second impeller (36) along its axis of rotation.

13. A combined blade fan with a bidirectional asymmetrical impeller according to claim 11 or 12, characterized in that, The length of the first impeller (37) in the direction perpendicular to the rotation axis is less than the length of the second impeller (36) in the direction perpendicular to the rotation axis.

14. A combined blade fan with a bidirectional asymmetrical impeller according to any one of claims 11-13, characterized in that, The second impeller (36) and the first impeller (37) are both centrifugal structures with blades, and the second impeller (36) and the first impeller (37) rotate in opposite directions to drive the gas movement; the second air exchange port (32) and the first air exchange port (33) are both located on the side wall of the housing assembly (31).

15. A combined blade fan with a bidirectional asymmetrical impeller according to any one of claims 11-14, characterized in that, The housing assembly (31) includes: The upper shell (313), the middle shell (314), and the lower shell (315) are interconnected; a first space is formed between the upper shell (313) and the middle shell (314); a second space is formed between the middle shell (314) and the lower shell (315).

16. A combined blade fan with a bidirectional asymmetrical impeller according to claim 5, characterized in that, The outer side wall of the middle housing (314) has a second protrusion (38), which is configured to connect with the support layer (39) to fix the relative position of the housing assembly (31) and the support layer (39).

17. A combined blade fan with a bidirectional asymmetrical impeller according to claim 6, characterized in that, The diameter of the lower housing (315) is greater than the diameter of the upper housing (313), and the diameter of the second protrusion (38) is greater than or equal to the diameter of the lower housing (315); the second protrusion (38) forms a connection space with the lower housing (315), and is configured to connect with the air guide layer (311) to fix the relative position between the housing assembly (31) and the air guide layer (311).

18. A car seat ventilation system, characterized in that, include: A combined blade fan with bidirectional asymmetrical impellers as described in any one of claims 11-17; A support layer (39) is provided with a ventilation duct (316), which is configured to connect the space of the support layer (39) near the occupant and the space away from the occupant; the support layer (39) is provided with a guide section on the side away from the occupant; the housing assembly (31) is connected to the guide section, and the second airflow exchange port (32) is connected to the internal space of the guide section.

19. A car seat ventilation system according to claim 18, characterized in that, The air guide section includes an air guide layer (311) and an air bag membrane (312), the air bag membrane (312) covering the air guide layer (311); the air guide layer (311) is provided with an installation groove (310), the housing assembly (31) is disposed in the installation groove (310), and the second airflow exchange port (32) is connected to the internal space of the air guide layer (311); the side of the air bag membrane (312) near the support layer (39) is provided with a ventilation hole, the ventilation hole is connected to the ventilation duct (316), and the side of the air bag membrane (312) away from the support layer (39) is provided with a first installation hole corresponding to the installation groove (310), configured to accommodate the housing assembly (31).

20. A car seat ventilation system according to claim 18 or 19, characterized in that, The air guide section includes an air guide groove, which is connected to the ventilation duct (316). A sealing layer is provided on the side of the air guide groove away from the support layer (39). A second mounting hole is provided on the sealing layer. The housing assembly (31) passes through the second mounting hole and is disposed in the air guide groove. The second air exchange port (32) and the internal space formed by the air guide groove and the sealing layer are connected.

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