A seat ventilation fan assembly

Abstract

The application discloses a seat ventilation fan assembly, which belongs to the technical field of automobile seats and comprises an upper shell, an impeller and a lower shell, wherein the upper shell is detachably connected with the lower shell, the impeller is rotationally connected with the lower shell, the impeller comprises an upper blade ring and a lower blade ring, a plurality of arc-shaped fan blades are arranged between the upper blade ring and the lower blade ring, and an air inlet is formed in the middle of the upper shell, characterized in that the diameter of the upper blade ring is larger than that of the lower blade ring, the fan blades are provided with a root angle close to one side of the center of the lower blade ring, one end of each fan blade is connected with the upper blade ring, the other end of each fan blade is connected with the lower blade ring through the root angle, a connecting ring is arranged on the outer periphery of the lower blade ring, and one end of each fan blade is connected with the connecting ring, so that the number and size of the fan blades can be adjusted, the air inlet angle and thickness of the impeller can be adjusted, the blowing capacity of the seat ventilation fan assembly is ensured, the seat ventilation fan is lightened, the air inlet amount per unit time is increased, and the wind howling noise is reduced.

Description

Technical Field

[0001] This invention relates to the field of automotive seat technology, and more specifically to a seat ventilation fan assembly. Background Technology

[0002] As living standards improve, cars have gradually become a common mode of transportation, and people have increasingly higher demands for car comfort. Among these, the comfort of car seats has the most critical impact on usability, and more and more manufacturers are adopting seats with ventilation functions.

[0003] Chinese utility model patent publication number "CN222936972U" discloses a butterfly-shaped suction fan, comprising an upper shell, a fan assembly, and a lower shell arranged sequentially from top to bottom; the upper shell has an air inlet; a first baffle ring is fixedly provided on one side of the air inlet; the fan assembly has an upper inlet and multiple side air outlets, the upper inlet communicating with each side air outlet; a second baffle ring is fixedly provided on the upper inlet; the inner diameter of the second baffle ring is larger than the outer diameter of the first baffle ring; and in the vertical direction, the upper end of the second baffle ring is higher than the lower end of the first baffle ring; there is a rotational gap between the upper shell and the fan assembly; a stator is fixedly provided on the lower shell, and a rotor is fixedly provided inside the fan assembly; multiple upwardly extending connecting posts are fixedly provided on the circumferential edge of the lower shell, and a locking piece is provided at the upper end of the connecting post; connecting holes are provided on the circumferential edge of the upper shell corresponding to the positions of each connecting post, and each locking piece is respectively engaged in the corresponding connecting hole.

[0004] However, according to paragraphs

[0051] to

[0083] of its instruction manual, its impeller is integrally injection molded. In order to ensure the structural strength of the impeller during processing, the impeller is made thicker as a whole and has densely arranged fan blades. However, the dense fan blades make the air duct outline on the impeller smaller, resulting in a smaller air volume and a tendency to generate wind howling during use, which in turn leads to greater noise.

[0005] Meanwhile, a dynamic balancing mounting groove is set around the fan wheel, and a dynamic balancing block is set in the dynamic balancing mounting groove. The balance block is set in different dynamic balancing mounting grooves according to the vibration of the fan wheel, so as to achieve the balance of the fan wheel. Therefore, the fan wheel needs to be calibrated and counterweighted before it can be assembled, which is inconvenient. In addition, the weight of the counterweight block is different, and it needs to be adjusted many times to achieve the balance of the fan wheel, which is quite cumbersome. Summary of the Invention

[0006] The purpose of this invention is to provide a seat ventilation fan assembly with a small duct profile, large air volume, low noise, and self-balancing.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a seat ventilation fan assembly, comprising an upper shell, an impeller, and a lower shell, wherein the upper shell and the lower shell are detachably connected, and the impeller is rotatably engaged with the lower shell. The impeller includes an upper blade ring and a lower blade ring, and a plurality of arc-shaped fan blades are provided between the upper blade ring and the lower blade ring. An air inlet is provided in the middle of the upper shell. The characteristic feature is that the diameter of the upper blade ring is larger than the diameter of the lower blade ring, and the fan blades have a root angle on the side near the center of the lower blade ring. One end of the fan blade is connected to the upper blade ring, and the other end is connected to the lower blade ring through the root angle. A connecting ring is provided on the outer periphery of the lower blade ring, and the end of the fan blade opposite to the upper blade ring is connected to the connecting ring.

[0008] By adopting the above technical solution—with the upper blade ring diameter being larger than the lower blade ring diameter, one end of the fan blade connected to the upper blade ring, and the other end connected to the lower blade ring via the root approach angle—it is easy to adjust the number and size of the fan blades during impeller production, as well as the air inlet angle and thickness of the impeller. This ensures the blowing capacity of the seat ventilation fan assembly while achieving lightweight design. Furthermore, it allows the fan blades to form a larger airflow guiding surface near the center of the lower blade ring. Under the guidance of the root approach angle, the airflow at the air inlet flows more smoothly along the surface of the fan blades, reducing airflow separation and vortex generation. At the same time, the connecting ring on the outer periphery of the lower blade ring radially fixes the end of the fan blades, allowing the thickness and arrangement density of the fan blades to be appropriately reduced while maintaining structural strength. This reduces the airflow volume per unit time and lowers the whistling noise while shrinking the duct profile.

[0009] The aforementioned seat ventilation fan assembly can be further configured such that: a number of arc-shaped slots are provided on the side of the connecting ring near the fan blade, the end of the fan blade passes through the arc-shaped slots, a positioning protrusion is provided on the inner ring of the connecting ring, a positioning notch is provided on the lower blade ring, and the positioning protrusion passes through the positioning notch to cause the end of the fan blade to pass through the arc-shaped slots.

[0010] By adopting the above technical solution: the positioning protrusion of the inner ring of the connecting ring enters the positioning notch of the lower blade ring to achieve circumferential positioning, so that the arc-shaped groove on the connecting ring is accurately aligned with the end of the blade. After the end of the blade enters the arc-shaped groove, it forms a double limit in both radial and circumferential directions, which prevents the blade from shifting or loosening when rotating at high speed. At the same time, the contact surface between the arc-shaped groove and the end of the blade extends along the bending direction of the blade, reducing stress concentration, thereby improving the overall structural stability and fatigue resistance of the impeller.

[0011] The aforementioned seat ventilation fan assembly can be further configured as follows: a connecting cylinder extends outward from the middle of the lower blade ring toward the upper blade ring; an annular liquid cavity is circumferentially opened on one end face of the connecting cylinder relative to the lower blade ring; a sealing cover plate for sealing the annular liquid cavity is connected to the connecting cylinder; the annular liquid cavity is a sealed cavity and is filled with a balancing liquid; a number of partition components are arranged circumferentially within the annular liquid cavity; the partition components divide the annular liquid cavity into a number of liquid chambers.

[0012] By adopting the above technical solution: when the impeller is at low speed or stationary, the partition component keeps the liquid tank isolated to prevent disorderly liquid sloshing. When the impeller rotates at high speed, the centrifugal force causes the partition component to deform or shift, thereby connecting adjacent liquid tanks. The balancing liquid can flow circumferentially in the annular liquid cavity and automatically redistribute. The fluidity of the liquid is used to compensate for the imbalance caused by manufacturing errors or material inhomogeneity. No additional dynamic balancing block installation and calibration are required. At the same time, the partition component restricts excessive liquid movement during rotation to avoid additional vibration. Thus, the self-balancing operation of the impeller and vibration reduction and noise reduction are achieved while reducing assembly complexity.

[0013] The aforementioned seat ventilation fan assembly can be further configured as follows: the partition component includes a sealing base, a return spring, a partition slider, a seal, and a partition seat. The sealing base has a spring cavity and a sealing groove, which are connected. The return spring passes through the spring cavity, and the partition slider passes through the sealing groove and slides with the sealing base. One end of the return spring abuts against the end face of the spring cavity, and the other end abuts against the end face of the partition slider. The seal is snapped onto the end of the partition slider. The partition seat has a sealing cavity, and the seal is interference-fitted with the sealing cavity. Several throttling holes are opened on both sides of the partition seat connecting the sealing cavity. The balancing fluid can flow between adjacent liquid tanks through the throttling holes to achieve automatic dynamic balance compensation.

[0014] By adopting the above technical solution: the spring cavity in the sealing base is connected to the sealing groove. One end of the return spring abuts against the end face of the spring cavity and the other end abuts against the end face of the partition slider, pressing the partition slider against the end of the sealing groove. This causes the sealing element at the end of the partition slider to form an interference fit with the sealing cavity on the partition seat to maintain the partition state. When the impeller rotates at high speed, the centrifugal force overcomes the preload of the return spring and drives the partition slider to move along the sealing groove. The sealing element disengages from the sealing cavity, allowing adjacent liquid tanks to connect through the throttling holes on both sides of the partition seat. The balancing liquid can automatically flow between the liquid tanks through the throttling holes to compensate for the impeller's imbalance. At the same time, the throttling holes limit the instantaneous large flow of liquid, avoiding additional vibration caused by violent liquid shaking. Thus, the impeller achieves self-balancing operation and vibration reduction and noise reduction without external correction.

[0015] The aforementioned seat ventilation fan assembly can be further configured as follows: a first baffle ring extends outward from the side of the air inlet near the impeller, a second baffle ring extends outward from the outer periphery of the upper shell near the impeller, a baffle groove is formed between the first baffle ring and the second baffle ring, an air intake is provided in the middle of the upper impeller ring, a third baffle ring extends outward from the side of the air intake near the upper shell, and the third baffle ring passes through the baffle groove.

[0016] By adopting the above technical solution: the windproof groove formed between the first windproof ring and the second windproof ring is fitted with the third windproof ring with a clearance, and the third windproof ring passes through the windproof groove, forming multiple labyrinth-like sealing paths between the upper blade ring and the upper shell, reducing the short-circuiting phenomenon of airflow returning from the impeller outlet to the air inlet. At the same time, the tortuous structure of the windproof groove reduces the turbulence intensity and wind noise when high-speed airflow passes through, thereby improving the effective air intake of the fan assembly and improving the quietness effect.

[0017] The aforementioned seat ventilation fan assembly can be further configured as follows: the upper shell has a connecting edge around the air inlet on the side opposite to the lower shell, the connecting edge has several sets of first reinforcing ribs, several sets of second reinforcing ribs are provided between any two sets of first reinforcing ribs, the first reinforcing ribs and the second reinforcing ribs separate the air inlet to form several air inlet slots, the connecting edge has several connecting hooks for connecting the seat at intervals around the connecting edge, and the upper shell has several connecting slots around the connecting edge.

[0018] By adopting the above technical solution: the first and second reinforcing ribs inside the connecting edge are staggered, dividing the air inlet into multiple air inlet slots. While ensuring the rigidity of the upper shell structure, the total area of ​​the air inlet channel is increased, reducing the local resistance when the airflow enters. The connecting hooks on the outer periphery of the upper shell are used to snap and fix it to the seat frame, and the connecting slots are used to cooperate with the corresponding buckles of the lower shell to achieve a detachable connection, thus taking into account both the installation firmness of the fan assembly and the air intake efficiency.

[0019] The aforementioned seat ventilation fan assembly can be further configured such that: the outer periphery of the upper shell is provided with a plurality of first connecting ears, the outer periphery of the lower shell is provided with a plurality of second connecting ears, a connecting tube is provided on the side of the first connecting ears facing the second connecting ears, the second connecting ears are provided with connecting holes, and the connecting tube passes through the connecting holes to facilitate the connection between the upper shell and the lower shell.

[0020] By adopting the above technical solution: the connecting cylinder is inserted into the connecting hole of the second connecting ear to form a plug-in fit, so that the first connecting ear and the second connecting ear fit together in the circumferential direction. The upper shell and the lower shell can be quickly aligned and pre-fixed through the cooperation of multiple sets of connecting cylinders and connecting holes, which reduces the number of additional fasteners used. At the same time, the clearance fit between the connecting cylinder and the connecting hole allows the upper shell and the lower shell to maintain a stable relative position under vibration environment, reducing friction noise caused by shell misalignment.

[0021] The aforementioned seat ventilation fan assembly can be further configured as follows: a first positioning block extends outward from the end of the connecting cylinder, a second positioning block is provided in the connecting hole, a positioning hook is provided on the outer periphery of the first positioning block, a positioning boss is provided at one end of the connecting hole opposite to the upper shell, the connecting cylinder passes through the connecting hole to cause the positioning hook to abut against the end face of the positioning boss, the end face of the connecting cylinder abuts against the end face of the second positioning block, and an unlocking groove is provided on the end face of the second connecting ear connected to the connecting hole.

[0022] By adopting the above technical solution: when the connecting cylinder is inserted into the connecting hole, the positioning hook on the outer periphery of the first positioning block abuts against the end face of the positioning boss at the end of the connecting hole to form an axial limit. At the same time, the end face of the connecting cylinder abuts against the end face of the second positioning block to limit excessive insertion. The double abutment structure allows the upper and lower shells to maintain a stable connection without fasteners, reducing the risk of connection loosening due to vibration. Meanwhile, the elastic locking characteristic of the positioning hook facilitates quick snapping during assembly, improving assembly efficiency. In addition, when it is necessary to disassemble the upper and lower shells, the tool can be inserted through the unlocking groove and moved to disengage the positioning hook from the end face of the positioning boss, thereby releasing the axial lock and facilitating the removal of the connecting cylinder from the connecting hole, improving the ease of disassembly and assembly of the fan assembly during maintenance or replacement.

[0023] The aforementioned seat ventilation fan assembly can be further configured as follows: a mounting sleeve for connecting a drive component is provided on the side of the lower housing facing the upper housing; a drive component is connected to the outer periphery of the mounting sleeve; a receiving annular groove for accommodating a circuit board is opened on the periphery of the mounting sleeve on the lower housing; a receiving channel is opened between the receiving annular groove and the outer periphery of the lower housing; one end of the receiving channel is connected to the receiving annular groove and the other end is connected to the outer periphery of the lower housing; and a connector for accommodating pins is provided at the end of the receiving channel on the lower housing.

[0024] By adopting the above technical solution: the mounting sleeve provides radial positioning and axial support for the drive component, the receiving annular groove surrounds the circuit board around the mounting sleeve, reducing the extra height space occupied by the circuit board inside the fan assembly. One end of the receiving channel is connected to the receiving annular groove, and the other end extends to the outer periphery of the lower housing and docks with the connector, so that the connection harness of the circuit board and the external power supply or controller is led out in an orderly manner along the channel, avoiding the wiring harness from wandering in the housing and interfering with the impeller or drive component. At the same time, the connectors are centrally arranged at the end of the lower housing to facilitate the plugging and unplugging of the vehicle wiring harness, improving the assembly integration of the fan assembly and the reliability of the electrical connection.

[0025] The aforementioned seat ventilation fan assembly can be further configured such that: a first mounting boss for mounting the rotor is provided on the outer periphery of the mounting sleeve, and a second mounting boss for connecting the rotating shaft is provided on the inner wall of the mounting sleeve.

[0026] By adopting the above technical solution: the first mounting boss on the outer periphery of the mounting sleeve provides precise radial mounting positioning for the rotor, and the second mounting boss on the inner wall of the mounting sleeve is used to connect the rotating shaft and limit the rotation axis of the rotating shaft, so that the rotor and the rotating shaft maintain concentricity on the same axis of the mounting sleeve, reducing impeller wobble and vibration caused by assembly deviation, thereby improving the smooth operation of the fan assembly at high speed.

[0027] The beneficial effects of this invention are as follows: First, the upper blade ring has a larger diameter than the lower blade ring, and the fan blade is connected to the lower blade ring through the root approach angle. This creates a larger airflow guiding surface on the side of the fan blade closer to the center of the lower blade ring, thereby reducing airflow separation and vortex generation. At the same time, the connecting ring on the outer periphery of the lower blade ring uses positioning protrusions and positioning notches to ensure that the end of the fan blade accurately enters the arc-shaped groove, forming a double limit in the radial and circumferential directions to prevent offset or loosening during high-speed rotation. Furthermore, the contact surface between the arc-shaped groove and the end of the fan blade extends along the bending direction to reduce stress concentration. This increases the air intake per unit time and reduces wind noise while reducing the duct profile, and also achieves the lightweighting and structural stability of the impeller.

[0028] Secondly, the connecting cylinder end face in the middle of the lower impeller ring has an annular liquid cavity filled with balancing liquid. The annular liquid cavity is circumferentially spaced with a partition assembly consisting of a sealing base, a return spring, a partition slider, and a seal. When the impeller is at low speed, the partition assembly keeps the liquid compartment isolated to prevent disorderly liquid sloshing. When rotating at high speed, the centrifugal force overcomes the spring preload, causing the seal to disengage from the sealing cavity and connect with the adjacent liquid compartment. The balancing liquid flows automatically through the throttling orifice to compensate for the impeller's imbalance. At the same time, the wind deflector and the third wind deflector ring form a labyrinthine sealing path to reduce airflow short circuits. The hooks of the connecting cylinder and the connecting hole enable quick assembly and disassembly of the upper and lower shells. Thus, the impeller achieves self-balancing operation and vibration reduction and noise reduction without the need for external dynamic balancing correction, and improves the assembly convenience and sealing effect of the fan assembly.

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the upper shell structure of the present invention; Figure 3 This is a schematic diagram of the upper shell structure from another perspective of the present invention; Figure 4 This is a schematic diagram of the impeller split structure of the present invention; Figure 5 This is a schematic diagram of the upper blade ring, fan blade, and lower blade ring assembly of the present invention; Figure 6 This is a schematic diagram of the lower shell structure of the present invention; Figure 7 This is a schematic diagram of the lower shell structure from another perspective of the present invention; Figure 8 This is a schematic diagram of the partition assembly of the present invention; Label annotations: Upper shell 1, Air inlet 11, Air inlet slot 111, First wind deflector ring 12, Second wind deflector ring 13, Wind deflector slot 14, Connecting edge 15, First reinforcing rib 151, Second reinforcing rib 152, Connecting hook 153, Connecting slot 154, First connecting lug 16, Connecting cylinder 161, First positioning block 162, Positioning hook 163, Impeller 2, Upper blade ring 21, Air inlet 211, Third wind deflector ring 212, Lower blade ring 22, Positioning notch 221, Connecting cylinder 222, Annular liquid chamber 223, Liquid tank 224, Sealing cover 225, Fan blade 2 3. Root entry angle 231, connecting ring 24, arc-shaped groove 241, positioning protrusion 242, lower shell 3, second connecting ear 31, connecting hole 311, second positioning block 312, positioning boss 313, unlocking groove 314, mounting sleeve 32, first mounting boss 321, second mounting boss 322, receiving ring groove 33, receiving channel 34, connector 35, partition assembly 4, sealing base 41, spring cavity 411, sealing slide 412, return spring 42, partition slider 43, sealing element 44, partition seat 45, sealing cavity 451, throttling hole 452. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] A seat ventilation fan assembly, such as Figures 1 to 8 As shown, it includes an upper shell 1, an impeller 2, and a lower shell 3. The upper shell 1 and the lower shell 3 are detachably connected. The impeller 2 and the lower shell 3 are rotatably coupled. The impeller 2 includes an upper blade ring 21 and a lower blade ring 22. Several arc-shaped fan blades 23 are provided between the upper blade ring 21 and the lower blade ring 22. An air inlet 11 is provided in the middle of the upper shell 1. The diameter of the upper blade ring 21 is larger than the diameter of the lower blade ring 22. The fan blades 23 have a root entry angle 231 on the side near the center of the lower blade ring 22. One end of the fan blade 23 is connected to the upper blade ring 21, and the other end is connected to the lower blade ring 22 through the root entry angle 231. A connecting ring 24 is provided on the outer periphery of the lower blade ring 22. The end of the fan blade 23 opposite to the upper blade ring 21 is connected to the connecting ring 24.

[0033] like Figure 2 , Figure 3As shown, the upper shell 1 has a connecting edge 15 on the side opposite to the lower shell 3 around the air inlet 11. The connecting edge 15 has several sets of first reinforcing ribs 151. Several sets of second reinforcing ribs 152 are provided between any two sets of first reinforcing ribs 151. The first reinforcing ribs 151 and the second reinforcing ribs 152 separate the air inlet 11 to form several air inlet slots 111. Several connecting hooks 153 for connecting seats are provided at intervals around the connecting edge 15. Several connecting slots 154 are opened around the connecting edge 15.

[0034] The upper shell 1 has several first connecting ears 16 on its outer periphery. The first connecting ears 16 have a connecting tube 161 on the side facing the lower shell 3. The end of the connecting tube 161 extends outward with a first positioning block 162. The outer periphery of the first positioning block 162 has a positioning hook 163.

[0035] like Figure 4 , Figure 5 As shown, the connecting ring 24 has several arc-shaped slots 241 on the side near the fan blade 23. The end of the fan blade 23 passes through the arc-shaped slots 241. The inner ring of the connecting ring 24 has a positioning protrusion 242. The lower blade ring 22 has a positioning notch 221. The positioning protrusion 242 passes through the positioning notch 221, which causes the end of the fan blade 23 to pass through the arc-shaped slots 241.

[0036] A connecting cylinder 222 extends outward from the middle of the lower blade ring 22 toward the upper blade ring 21. An annular liquid cavity 223 is circumferentially opened on one end face of the connecting cylinder 222 opposite to the lower blade ring 22. A sealing cover plate 225 for sealing the annular liquid cavity 223 is connected to the connecting cylinder 222. The annular liquid cavity 223 is a sealed cavity and is filled with a balancing liquid. Several partition components 4 are arranged circumferentially inside the annular liquid cavity 223, which divides the annular liquid cavity 223 into several liquid chambers 224.

[0037] A first wind-blocking ring 12 extends outward from the side of the air inlet 11 near the impeller 2, and a second wind-blocking ring 13 extends outward from the outer periphery of the upper shell 1 near the impeller 2. A wind-blocking groove 14 is formed between the first wind-blocking ring 12 and the second wind-blocking ring 13. An air intake 211 is provided in the middle of the upper impeller ring 21, and a third wind-blocking ring 212 extends outward from the side of the air intake 211 near the upper shell 1. The third wind-blocking ring 212 passes through the wind-blocking groove 14.

[0038] like Figure 6 , Figure 7 As shown, the lower shell 3 has several second connecting ears 31 on its outer periphery. The second connecting ears 31 have connecting holes 311. The connecting cylinder 161 passes through the connecting holes 311 to facilitate the connection between the upper shell 1 and the lower shell 3.

[0039] A second positioning block 312 is provided inside the connecting hole 311. A positioning boss 313 is provided at one end of the connecting hole 311 opposite to the upper shell 1. The connecting cylinder 161 passes through the connecting hole 311, causing the positioning hook 163 to abut against the end face of the positioning boss 313. The end face of the connecting cylinder 161 abuts against the end face of the second positioning block 312. The end face of the second connecting ear 31 is connected to the connecting hole 311 and has an unlocking groove 314.

[0040] The lower shell 3 is provided with a mounting sleeve 32 for connecting the drive component on the side facing the upper shell 1. The drive component is connected to the outer periphery of the mounting sleeve 32. The lower shell 3 has a receiving annular groove 33 for accommodating the circuit board on the periphery of the mounting sleeve 32. A receiving channel 34 is provided between the receiving annular groove 33 and the outer periphery of the lower shell 3. One end of the receiving channel 34 is connected to the receiving annular groove 33 and the other end is connected to the outer periphery of the lower shell 3. The lower shell 3 has a connector 35 for accommodating the pin at the end of the receiving channel 34.

[0041] The outer periphery of the mounting sleeve 32 is provided with a first mounting boss 321 for mounting the rotor, and the inner wall of the mounting sleeve 32 is provided with a second mounting boss 322 for connecting the rotating shaft.

[0042] like Figure 8 As shown, the partition assembly 4 includes a sealing base 41, a return spring 42, a partition slider 43, a seal 44, and a partition seat 45. The sealing base 41 has a spring cavity 411 and a sealing groove 412, which are connected. The return spring 42 passes through the spring cavity 411, and the partition slider 43 passes through the sealing groove 412 and slides in cooperation with the sealing base 41. One end of the return spring 42 abuts against the end face of the spring cavity 411, and the other end abuts against the end face of the partition slider 43. The seal 44 is snapped into the end of the partition slider 43. The partition seat 45 has a sealing cavity 451, which is press-fitted with the seal 44. Several throttling holes 452 are opened on both sides of the partition seat 45, which are connected to the sealing cavity 451. The balancing fluid can flow between adjacent liquid tanks 224 through the throttling holes 452 to achieve automatic dynamic balance compensation.

[0043] The assembly process in this embodiment is as follows: First, the impeller 2 is pre-assembled so that the positioning protrusion 242 of the inner ring of the connecting ring 24 is inserted into the positioning notch 221 of the lower blade ring 22 to achieve circumferential positioning of the connecting ring 24 and the lower blade ring 22. At the same time, the other end of the fan blade 23 is inserted into the arc-shaped groove 241 on the connecting ring 24 to form radial and circumferential limiting. Then, the connecting ring 24 and the lower blade ring 22 are bonded or welded together, and the fan blade 23 and the connecting ring 24 are bonded or welded together. At this time, the upper blade ring 21, the lower blade ring 22, the fan blade 23 and the connecting ring 24 constitute an integrated impeller 2.

[0044] Subsequently, six sets of partition components are fixed circumferentially at intervals within the annular liquid cavity 223 of the connecting cylinder 222 to form six liquid chambers 224. The sealing base 41 and the partition seat 45 are respectively connected to the inner and outer side walls of the annular liquid cavity 223. The return spring 42 abuts against the partition slider 43 to cause the sealing element 44 to be placed in the sealing cavity 451, sealing the throttling orifice 452. Then, a certain amount of balance liquid is injected into the liquid chamber 224. After the injection is completed, the sealing cover plate 225 is welded to seal the annular liquid cavity 223.

[0045] The rotor of the single-phase motor is then installed into the mounting sleeve 32 of the lower housing 3, and the stator is installed in the connecting cylinder 222 of the lower blade ring 22. At the same time, the circuit board connected to the rotor is installed in the receiving ring groove 33, and the circuit board passes through the receiving channel 34 to insert the pin into the connector 35.

[0046] Then, the impeller 2 is assembled with the lower shell 3. First, the impeller 2 is placed inside the lower shell 3 and the connecting cylinder 222 in the middle of the lower blade ring 22 is aligned coaxially with the drive component mounting sleeve 32 inside the lower shell 3. Then, the impeller 2 is sleeved on the outer circumference of the mounting sleeve 32 so that the impeller 2 can rotate around the mounting sleeve 32.

[0047] Next, the upper shell 1 and the lower shell 3 are closed. First, the connecting tube 161 on the first connecting lug 16 on the outer periphery of the upper shell 1 is aligned with the connecting hole 311 on the second connecting lug 31 on the outer periphery of the lower shell 3. Then, the connecting tube 161 is inserted into the connecting hole 311. At this time, the positioning hook 163 on the outer periphery of the first positioning block 162 at the end of the connecting tube 161 abuts against the end face of the positioning boss 313 at the end of the connecting hole 311 to form an axial limit. At the same time, the end face of the connecting tube 161 abuts against the end face of the second positioning block 312 in the connecting hole 311 to limit over-insertion. Then, the upper shell 1 and the lower shell 3 are connected by the cooperation of multiple sets of connecting tubes 161 and connecting holes 311.

[0048] After assembly, the car seat fan assembly is placed on the test bench. When the impeller 2 speed is adjusted to the threshold, the isolation slider 43 is compressed by centrifugal force, causing the return spring 42 to be compressed. The seal 44 disengages from the sealing cavity 451, opening the throttling orifice 452. The balancing fluid automatically flows and redistributes within the annular liquid chamber 223, compensating for the imbalance of the impeller 2. When the impeller 2 speed decreases or stops, the return spring 42 pushes the isolation slider 43 to reset, and the seal 44 re-fits the sealing cavity 451 with an interference fit, dividing the annular liquid chamber 223 into independent liquid compartments 224 to prevent disorderly liquid movement.

[0049] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A seat ventilation fan assembly, comprising an upper housing, an impeller, and a lower housing, wherein the upper housing and the lower housing are detachably connected, the impeller is rotatably engaged with the lower housing, the impeller includes an upper blade ring and a lower blade ring, a plurality of arc-shaped fan blades are provided between the upper blade ring and the lower blade ring, and an air inlet is provided in the middle of the upper housing, characterized in that: The diameter of the upper blade ring is larger than that of the lower blade ring. The fan blade has a root entry angle on the side near the center of the lower blade ring. One end of the fan blade is connected to the upper blade ring, and the other end is connected to the lower blade ring through the root entry angle. A connecting ring is provided on the outer periphery of the lower blade ring. The end of the fan blade opposite to the upper blade ring is connected to the connecting ring.

2. The seat ventilation fan assembly according to claim 1, characterized in that: The connecting ring has several arc-shaped slots on the side near the fan blade. The end of the fan blade passes through the arc-shaped slots. The inner ring of the connecting ring has a positioning protrusion. The lower blade ring has a positioning notch. The positioning protrusion passes through the positioning notch to make the end of the fan blade pass through the arc-shaped slots.

3. A seat ventilation fan assembly according to claim 1, characterized in that: A connecting cylinder extends outward from the middle of the lower blade ring toward the upper blade ring. An annular liquid cavity is circumferentially formed on one end face of the connecting cylinder opposite to the lower blade ring. The connecting cylinder is connected to a sealing cover plate for sealing the annular liquid cavity. The annular liquid cavity is a sealed cavity and is filled with a balancing liquid. Several partition components are arranged circumferentially within the annular liquid cavity, and the partition components divide the annular liquid cavity into several liquid chambers.

4. A seat ventilation fan assembly according to claim 3, characterized in that: The partition assembly includes a sealing base, a return spring, a partition slider, a sealing element, and a partition seat. The sealing base has a spring cavity and a sealing groove, which communicate with each other. The return spring passes through the spring cavity, and the partition slider passes through the sealing groove and slides in cooperation with the sealing base. One end of the return spring abuts against the end face of the spring cavity, and the other end abuts against the end face of the partition slider. The sealing element is snapped onto the end of the partition slider. The partition seat has a sealing cavity, and the sealing element is interference-fitted with the sealing cavity. Several throttling orifices are opened on both sides of the partition seat connecting the sealing cavity, allowing the balancing fluid to flow between adjacent liquid tanks through the throttling orifices to achieve automatic dynamic balance compensation.

5. A seat ventilation fan assembly according to claim 1, characterized in that: The air inlet has a first windproof ring extending outward from the side near the impeller, and the upper shell has a second windproof ring extending outward from the side near the impeller. A windproof groove is formed between the first windproof ring and the second windproof ring. An air intake is provided in the middle of the upper impeller ring, and a third windproof ring extends outward from the side near the upper shell. The third windproof ring passes through the windproof groove.

6. A seat ventilation fan assembly according to claim 5, characterized in that: The upper shell has a connecting rim around the air inlet on the side opposite to the lower shell. The connecting rim has several sets of first reinforcing ribs, and several sets of second reinforcing ribs are provided between any two sets of first reinforcing ribs. The first and second reinforcing ribs separate the air inlet to form several air inlet slots. The connecting rim has several connecting hooks for connecting seats at intervals around it. The upper shell has several connecting slots around the connecting rim.

7. A seat ventilation fan assembly according to claim 6, characterized in that: The upper shell has a plurality of first connecting ears on its outer periphery, and the lower shell has a plurality of second connecting ears on its outer periphery. A connecting tube is provided on the side of the first connecting ear facing the second connecting ear, and a connecting hole is opened in the second connecting ear. The connecting tube passes through the connecting hole to facilitate the connection between the upper shell and the lower shell.

8. A seat ventilation fan assembly according to claim 7, characterized in that: The connecting cylinder has a first positioning block extending outward from its end, and a second positioning block is provided in the connecting hole. The first positioning block has a positioning hook on its outer periphery. The connecting hole has a positioning boss at one end opposite to the upper shell. The connecting cylinder passes through the connecting hole to cause the positioning hook to abut against the end face of the positioning boss. The end face of the connecting cylinder abuts against the end face of the second positioning block. The end face of the second connecting lug is connected to the connecting hole and has an unlocking groove.

9. A seat ventilation fan assembly according to claim 8, characterized in that: The lower shell has a mounting sleeve for connecting the drive component on the side facing the upper shell. The drive component is connected to the outer periphery of the mounting sleeve. The lower shell has a receiving annular groove for accommodating the circuit board on the periphery of the mounting sleeve. A receiving channel is formed between the receiving annular groove and the outer periphery of the lower shell. One end of the receiving channel is connected to the receiving annular groove and the other end is connected to the outer periphery of the lower shell. The lower shell has a connector for accommodating pins at the end of the receiving channel.

10. A seat ventilation fan assembly according to claim 9, characterized in that: The outer periphery of the mounting sleeve is provided with a first mounting boss for mounting the rotor, and the inner wall of the mounting sleeve is provided with a second mounting boss for connecting the rotating shaft.

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