Multi-jet orifice induced draft fan

Abstract

The application relates to the technical field of micro fans, in particular to a multi-jet-hole guide fan, which comprises a fan body and a guide device arranged on one side or both sides of the fan body through a gap, at least two jet-hole units are arranged on the side of the fan body close to the guide device, and each jet-hole unit comprises at least two jet holes arranged at intervals, in the application, the design of a single first guide channel with multiple jet holes can help to expand the suction range when the airflow sprayed by the multiple jet holes enters the corresponding first guide channel after passing through the guide cavity, meanwhile, the one-to-many mode can reduce the local pressure peak value, inhibit the formation of turbulent flow and the impact on the wall surface of the first guide channel, and is beneficial to improving the flow and reducing the noise; on the other hand, the setting of the convex part can force the circumferential gas to smoothly turn along the surface of the convex part, reduce the airflow separation area, and reduce the instability of the shear layer.

Description

Technical Field

[0001] This invention relates to the field of micro fan technology, and more particularly to a fan based on multi-jet orifice airflow. Background Technology

[0002] Thermal management within confined spaces has gradually become a technological bottleneck restricting the further improvement of the intelligence level of 3C electronic terminal products. Existing technologies mostly use liquid cooling to disperse heat from heat sources to improve localized overheating, while air cooling can dissipate heat into the air more quickly and is considered the final link in heat dissipation technology. In recent years, the development of micro-volume fan technology has made it possible to place fans inside the internal space of electronic terminal products. For micro-volume fans, ensuring sufficient airflow output and air pressure while minimizing noise during operation is a key issue of current industry focus. Against this backdrop, new structures and processes based on micro-volume fans are constantly emerging. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in order to solve the problems of insufficient output flow and noise of the existing flow fans, a flow fan based on multiple jet holes is provided.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a multi-jet orifice air-guiding fan, including a fan body and an air-guiding device disposed on one or both sides of the fan body with a gap, the gap between the fan body and the air-guiding device forming a flow-guiding cavity, the flow-guiding cavity communicating with the outside, and the air-guiding device guiding the airflow generated by the fan body to be ejected in a set direction;

[0005] The fan body has at least two jet hole units spaced apart on the side near the air intake, and each jet hole unit contains at least two jet holes spaced apart. The airflow generated by the fan body is ejected through the jet holes.

[0006] The drainer includes a drain cavity formed by a top wall, a bottom wall, and a side wall connecting the top wall and the bottom wall. The drain cavity extends in a predetermined direction and penetrates the side wall, forming at least one outlet at the penetration point of the side wall. The top wall is located close to the fan body. A first drain channel is provided in the area of ​​the top wall opposite to the jet hole unit, corresponding to each jet hole unit and penetrating the top wall. The first drain channel communicates with the drain cavity.

[0007] The top wall has a protrusion on the side near the fan body that corresponds to the first airflow channel, and the first airflow channel passes through the corresponding protrusion.

[0008] Furthermore, the orthographic projection of the first drainage channel onto the fan body completely covers all the jet holes in the corresponding jet hole unit.

[0009] Furthermore, the cross-section of the jet orifice is circular, and the diameter of the jet orifice is [missing information]. The axial distance between the outlet end face of the jet orifice and the inlet end face of the first guide channel is... The height of the protrusion protruding from the top wall is The jet angle formed by the airflow ejected from the jet orifice is: airflow The spray angle is such that the diameter of the coverage area from the jet orifice to the inlet end face of the first guide channel is [missing information]. The protrusion is a closed ring, and the wall thickness of the protrusion opposite the inlet end face of the first drainage channel is... The constraints are:

[0010] ;

[0011] ;

[0012] ;

[0013] ;

[0014] At the inlet end face of the first drainage channel, the cross-section of the first drainage channel covers all the jet holes constituting the corresponding jet hole unit at a spray angle. The ejected airflow forms a coverage area at the inlet end face of the first inlet channel.

[0015] Furthermore, a second drainage channel corresponding to the first drainage channel is provided at intervals within the drainage cavity. The first drainage channel and the corresponding second drainage channel are connected, and the second drainage channel is connected to the outlet.

[0016] Furthermore, each of the first drainage channels is connected to at least two of the second drainage channels.

[0017] Furthermore, the flow area of ​​the second diversion channel gradually increases along the extension path from the second diversion channel to the outlet.

[0018] Furthermore, the protrusion has at least one of an inner peripheral rounded corner transition area, an outer peripheral rounded corner transition area, and a rounded corner transition area;

[0019] The inner peripheral rounded transition area is located on the inner peripheral edge of the top surface of the protrusion;

[0020] The outer peripheral rounded transition area is located on the outer peripheral edge of the top surface of the protrusion;

[0021] The rounded transition area is located at the junction of the side and top wall of the protrusion.

[0022] Furthermore, the side of the protrusion has a draft angle. , .

[0023] Furthermore, the flow areas of each jet orifice in the same jet orifice unit may be the same or different from each other.

[0024] Furthermore, it also includes a connector that connects the fan body to the air guide, and the portion of the connector opposite to the air guide cavity is provided with at least one vent, through which the air guide cavity communicates with the outside.

[0025] The beneficial effects of this invention are:

[0026] 1) In this invention, the design of configuring multiple jet holes in a single first guide channel has several advantages. First, it allows the airflow ejected from multiple jet holes to form a wider coverage area and a more uniform velocity distribution as it passes through the guide cavity and enters the corresponding first guide channel. This is beneficial for expanding the entrainment range. At the same time, this one-to-many approach can reduce local pressure peaks, suppress the formation of turbulence and the impact on the wall of the first guide channel, which is beneficial for increasing flow rate, reducing pressure loss, increasing wind pressure, and reducing noise. Second, as the high-speed airflow is ejected through the jet holes, passes through the guide cavity, and then enters the guide device through the first guide channel, it entrains the gas in the outer circumferential region of the jet hole unit and the protrusion in the guide cavity. The protrusion can force the circumferential gas to smoothly turn along the surface of the protrusion, reducing the area of ​​the airflow separation zone and reducing shear layer instability. In addition, a low-pressure backflow zone is formed at the junction of the side and top wall of the protrusion, which helps to delay pressure changes, weaken pressure pulsation, and thus suppress noise formation.

[0027] 2) In this invention, the jet generated by the jet hole of the fan body enters the corresponding first guide channel after passing through the guide cavity. It entrains the gas in the outer circumferential direction of the area opposite the jet hole unit and the protrusion in the guide cavity to form a primary guide. After the airflow is rectified by the first guide channel, it has high inertia and can still maintain a certain momentum to flow through the second guide channel and finally be ejected from the outlet on the side wall, thereby increasing the airflow at the outlet and improving the heat dissipation efficiency.

[0028] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is a schematic diagram of the invention based on a multi-jet orifice flow-guiding fan;

[0031] Figure 2This is a schematic diagram showing the orthographic projection of the jet orifice unit on the top wall within the corresponding first drainage channel (the dashed line in the diagram represents the orthographic projection of the jet orifice on the top wall).

[0032] Figure 3 This is a schematic diagram of the coverage area formed by the airflow ejected from the jet orifice at the inlet end face of the first guide channel;

[0033] Figure 4 This is a schematic diagram of a protrusion on the top wall;

[0034] Figure 5 This is a schematic diagram showing that the protrusion has a draft angle;

[0035] Figure 6 This is a schematic diagram of the jet hole unit and the first drainage channel projected onto the cross section of the side wall when the first drainage channel and the second drainage channel are connected in a one-to-one correspondence.

[0036] Figure 7 This is a schematic diagram of the jet hole unit and the first drainage channel projected onto the cross section of the sidewall when a single first drainage channel is connected to at least two second drainage channels.

[0037] Figure 8 This is a schematic diagram of the jet orifice unit and the first drainage channel projected onto the cross-section of the sidewall when they have the same outlet.

[0038] Figure 9 This is a schematic diagram of a drainage device with a plate-like structure of varying thickness on the top wall;

[0039] Figure 10 It is a schematic diagram showing that the width of the second diversion channel gradually increases in the longitudinal direction where it intersects with the extension path of the second diversion channel toward the outlet.

[0040] Figure 11 This is a schematic diagram showing how the connector connects the fan body to the air intake.

[0041] Figure 12 This is a schematic diagram showing that the connectors are multiple discrete partitions set between the fan body and the top wall;

[0042] Figure 13 This is a schematic diagram of a continuous partition plate with a closed-loop structure, which is used as the connector between the fan body and the top wall.

[0043] In the diagram: 1. Fan body; 11. Jet hole unit; 11a. Jet hole;

[0044] 2. Flow guiding cavity;

[0045] 3. Top wall; 31. First drainage channel; 32. Protrusion; 321. Inner peripheral rounded corner transition area; 322. Outer peripheral rounded corner transition area; 323. Rounded corner transition area;

[0046] 4. Side wall; 41. Outlet;

[0047] 5. Bottom wall;

[0048] 6. Second drainage channel;

[0049] 7. Connecting parts; 71. Divider; 72. Continuous partition plate; 73. Vent.

[0050] 8. Drainage device.

[0051] The diameter of the jet orifice;

[0052] The axial distance between the outlet end face of the jet orifice and the inlet end face of the first guide channel;

[0053] The protrusion extends beyond the height of the top wall;

[0054] The jet angle formed by the airflow being ejected from the jet orifice;

[0055] airflow The spray angle is the diameter of the area covered by the jet from the jet orifice to the inlet end face of the first guide channel;

[0056] The wall thickness of the protrusion opposite the inlet end face of the first drainage channel;

[0057] Draft angle on the side of the protrusion. Detailed Implementation

[0058] The invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner. Therefore, they only show the components relevant to the invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be limiting, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0059] Example 1,

[0060] like Figures 1-8As shown, a multi-jet orifice air-guiding fan includes a fan body 1 and air-guiding devices 8 disposed on one or both sides of the fan body 1 with a gap. The gap between the fan body 1 and the air-guiding devices 8 forms a flow-guiding cavity 2, which is connected to the outside. The air-guiding devices 8 guide the airflow generated by the fan body 1 to be ejected in a set direction. The set direction refers to the direction in which the outlet 41 of the fan in this embodiment faces the heat source, thereby realizing the heat dissipation of the heat source by the fan in this embodiment.

[0061] The fan body 1 has at least two jet hole units 11 spaced apart on the side near the air intake 8. Each jet hole unit 11 contains at least two jet holes 11a spaced apart. That is, the jet hole unit 11 is formed in the form of a hole group. The number of jet holes 11a contained in each jet hole unit 11 can be the same or different. In addition, the flow area of ​​each jet hole 11a in the same jet hole unit 11 can be the same or different from each other. That is, the flow area of ​​the at least two jet holes 11a contained in each jet hole unit 11 can be the same or different.

[0062] In this embodiment, the fan body 1 can be any of the prior art having at least two spaced-apart air outlet units, and each air outlet unit is formed as a fan containing at least two spaced-apart air outlets. In particular, it can be any of the prior art having at least two spaced-apart air outlet units, and each air outlet unit is formed as a piezoelectric fan containing at least two spaced-apart air outlets. The airflow generated by the fan body 1 is ejected from the air outlets, which are jet holes 11a in this embodiment. For example, the fan body 1 in this embodiment can be, but is not limited to, the fluid generating device disclosed in Chinese Patent Publication No. CN119084287A. The hole portion 321a in that patent corresponds to the jet hole 11a in this embodiment, and the hole group formed by multiple spaced-apart hole portions 321a corresponds to the jet hole unit 11 in this embodiment. The fan body 1 in this embodiment can also be a piezoelectric fan with publication No. CN11 The high-order resonance fluid generating device disclosed in Chinese Patent No. 8979867A corresponds to the jet hole 11a in this embodiment in the orifice 41 of that patent, and the orifice group formed by multiple orifices 41 arranged at intervals corresponds to the jet hole unit 11 in this embodiment. The fan body 1 in this embodiment can also adopt the high-order resonance fluid generating device disclosed in Chinese Patent No. CN118979867A, where the orifice 41 corresponds to the jet hole 11a in this embodiment, and the orifice group formed by multiple orifices 41 arranged at intervals corresponds to the jet hole unit 11 in this embodiment. The fan body 1 in this embodiment can also adopt the fluid generator and fluid control device disclosed in Chinese Patent No. CN120362060A, where the first orifice 221 corresponds to the jet hole 11a in this embodiment, and the orifice group formed by multiple first orifices 221 arranged at intervals corresponds to the jet hole unit 11 in this embodiment.

[0063] For ease of understanding, in this embodiment, four jet hole units 11 are spaced apart on the side of the fan body 1 near the air intake 8. Each jet hole unit 11 includes two jet holes 11a, and the two jet holes 11a in each jet hole unit 11 have the same flow area. However, this does not constitute a limitation of the present invention. It should also be noted that the jet holes 11a can be circular, rectangular, elliptical, oblong, or other forms, and are not limited here. In this embodiment, the jet holes 11a are circular. Figures 1-2 As shown.

[0064] The airflow generated by the fan body 1 is ejected through the jet hole 11a; the flow guide 8 includes a flow guide cavity formed by a top wall 3, a bottom wall 5 and a side wall 4 connecting the top wall 3 and the bottom wall 5. The flow guide cavity extends in a set direction and penetrates the side wall 4, and forms at least one outlet 41 at the penetration point of the side wall 4. The top wall 3 is located close to the fan body 1. The area of ​​the top wall 3 opposite to the jet hole unit 11 is provided with a first flow guide channel 31 that corresponds one-to-one with the jet hole unit 11 and penetrates the top wall 3. The first flow guide channel 31 communicates with the flow guide cavity; the cross-sectional shape of the first flow guide channel 31 can be circular, square, rectangular, elliptical or other shapes, and is not limited here.

[0065] The first guide channel 31 is provided in a one-to-one correspondence with the jet hole unit 11. That is, each jet hole unit 11 corresponds to one first guide channel 31. Preferably, the orthogonal projection of the first guide channel 31 on the fan body 1 completely covers all the jet holes 11a of the corresponding jet hole unit 11. That is, the flow area of ​​the first guide channel 31 is larger than the flow area of ​​the jet hole unit 11 opposite to it, thereby ensuring that the airflow ejected by the multiple jet holes 11a constituting each jet hole unit 11 can be completely contained by the first guide channel 31 opposite to it, avoiding flow loss caused by airflow overflow; the top wall 3 protrudes from the side near the fan body 1 with a protrusion 32 corresponding to the first guide channel 31, and the first guide channel 31 passes through the protrusion 32, such as Figure 2 As shown.

[0066] For any jet hole 11a included in the jet hole unit 11 in this embodiment, the cross-section of the jet hole 11a is circular, and the diameter of the jet hole 11a is [missing information]. The axial distance between the outlet end face of the jet orifice 11a and the inlet end face of the first guide channel 31 (i.e., the top surface of the protrusion 32) is... The protrusion 32 protrudes from the top wall 3 at a height of The jet angle formed by the airflow ejected from the jet hole 11a is... airflow The spray angle is such that the diameter of the area covered by the jet from the jet hole 11a to the inlet end face of the first guide channel 31 is [missing information]. The protrusion 32 is a closed ring, and the wall thickness of the protrusion 32 opposite to the inlet end face of the first drainage channel 31 is... The constraints are:

[0067] ;

[0068] ;

[0069] ;

[0070] ;

[0071] At the inlet end face of the first guide channel 31, the cross-section of the first guide channel 31 covers all the jet holes 11a that constitute the corresponding jet hole unit 11 at a jet angle. The ejected airflow forms a coverage area at the inlet end face of the first guide channel 31, such as Figure 3 As shown.

[0072] Therefore, on the one hand, it can ensure that the airflow ejected from the jet hole unit 11 can be completely contained by the first guide channel 31 opposite to it, avoiding flow loss caused by airflow overflow; on the other hand, it can increase the airflow entrainment effect while improving the structural compactness, thereby increasing the output flow.

[0073] Ideally, the protrusion 32 has at least one of the following: an inner peripheral rounded corner transition area 321, an outer peripheral rounded corner transition area 322, and a rounded corner transition area 323;

[0074] The inner peripheral rounded transition area 321 is provided on the inner peripheral edge of the top surface of the protrusion 32;

[0075] The outer peripheral rounded transition area 322 is provided on the outer peripheral edge of the top surface of the protrusion 32;

[0076] The rounded transition area 323 is located at the junction of the side of the protrusion 32 and the top wall 3.

[0077] In other words, the inner peripheral edge of the top surface of the protrusion 32 is provided with an inner peripheral rounded corner transition area 321, and / or the outer peripheral edge of the top surface of the protrusion 32 is provided with an outer peripheral rounded corner transition area 322, and / or the junction of the side surface of the protrusion 32 and the top wall 3 is provided with a rounded corner transition area 323, thereby reducing the flow resistance when the airflow flows along the wall and suppressing the gas turbulence that may occur at right-angle positions, such as Figure 4 As shown.

[0078] Ideally, the side of the protrusion 32 should have a draft angle. , The protrusion 32 may have draft angles on one or more sides, or all sides may have draft angles, such as... Figure 5 As shown, this facilitates demolding during injection molding.

[0079] When the fan is working, the high-speed airflow is ejected through the jet hole 11a, passes through the guide cavity 2 between the fan body 1 and the guide tube 8, and is then injected into the guide tube 8 through the first guide channel 31. During this process, the airflow is drawn into the outer circumferential area of ​​the area opposite to the jet hole unit 11 and the protrusion 32 in the guide cavity 2.

[0080] By configuring the first guide channel 31 and the jet hole unit 11 in a one-to-one correspondence, with each jet hole unit 11 containing at least two spaced jet holes 11a, and the first guide channel 31 penetrating through the protrusion 32 protruding towards the side of the fan body 1, on the one hand, compared to the prior art method of configuring the first guide channel 31 and the jet hole 11a in a one-to-one correspondence, by configuring the first guide channel 31 and the jet hole unit 11 (hole group) formed by multiple spaced jet holes 11a in a one-to-one correspondence, the airflow ejected from the multiple jet holes 11a of the same jet hole unit 11 forms a wider coverage area and a more uniform flow velocity distribution as it passes through the guide cavity 2 and enters the first guide channel 31, which is beneficial for expanding the entrainment range. At the same time, this one-to-many method can reduce local... The pressure peak suppresses the formation of turbulence and the impact on the wall of the first guide channel 31, which is beneficial to increase the flow rate, reduce pressure loss, increase wind pressure, and reduce noise. On the other hand, during the process of the high-speed airflow being ejected through the jet hole 11a, passing through the guide cavity 2 between the fan body 1 and the guide device 8, and then being injected into the guide device 8 through the first guide channel 31, the airflow entrained in the outer circumferential region of the jet hole unit 11 and the protrusion 32 in the guide cavity 2 is drawn in. The setting of the protrusion 32 can force the circumferential airflow to turn smoothly along the surface of the protrusion 32, reduce the area of ​​the airflow separation zone, and reduce the instability of the shear layer. In addition, a low-pressure backflow zone is formed at the junction of the side of the protrusion 32 and the top wall 3, which is beneficial to delay pressure change, weaken pressure pulsation, and thus suppress the formation of noise.

[0081] The drainage cavity is provided with second drainage channels 6 corresponding to the first drainage channel 31. The first drainage channel 31 and the corresponding second drainage channel 6 are connected. The second drainage channel 6 is connected to the outlet 41. Regarding the correspondence between the first drainage channel 31 and the second drainage channel 6:

[0082] It can be that the first drainage channel 31 and the second drainage channel 6 are connected in a one-to-one correspondence, such as... Figure 6 As shown, a single first drainage channel 31 can also be connected to at least two second drainage channels 6, forming a connection similar to a branching flow, such as... Figure 7 As shown, of course, at least two first drainage channels 31 can be connected to a second drainage channel 6 to form a connection similar to a confluence, which will not be elaborated here.

[0083] The second drainage channel 6 is connected to the outlet 41, and each second drainage channel 6 can be connected to the same outlet 41, such as... Figure 8 As shown, the drainage cavity can also extend in a set direction and penetrate the side wall 4 to form multiple outlets 41, with the second drainage channel 6 communicating with the corresponding outlets 41, such as... Figures 6-7 As shown; there may even be multiple outlets 41, and the same outlet 41 may be connected to one or two or more second drainage channels 6, which will not be elaborated here.

[0084] It is easy to understand that the jet hole unit 11 set on the fan body 1 is opposite to the top wall 3 of the guide 8, and the outlet 41 is set on the side wall 4 that forms the guide cavity. After the airflow is ejected from the jet hole 11a of the fan body 1, the flow direction is deflected under the action of the guide 8, so that the fan of this embodiment has the function of lateral jet flow.

[0085] Example 2

[0086] The difference between this embodiment and embodiment 1 is that the flow area of ​​the second diversion channel 6 gradually increases along the extension path from the second diversion channel 6 to the outlet 41, so that the airflow decelerates and restores pressure while flowing through the second diversion channel 6, thereby increasing the flow rate.

[0087] In this embodiment, the specific structure of the second drainage channel 6 can be as follows:

[0088] The top wall 3 has a plate-like structure with varying thickness; along the extension path from the second inlet channel 6 to the outlet 41, the thickness of the top wall 3 opposite to the second inlet channel 6 gradually decreases, so that the flow area of ​​the second inlet channel 6 gradually increases along the extension path from the second inlet channel 6 to the outlet 41, such as... Figure 9 As shown;

[0089] Alternatively, the bottom wall 5 may have a plate-like structure with varying thickness; along the extension path from the second inlet channel 6 to the outlet 41, the thickness of the bottom wall 5 opposite to the second inlet channel 6 gradually decreases, so that the flow area of ​​the second inlet channel 6 gradually increases along the extension path from the second inlet channel 6 to the outlet 41.

[0090] Alternatively, both the top wall 3 and the bottom wall 5 are plate-like structures with varying thicknesses; along the extension path from the second channel 6 to the outlet 41, the thickness of the top wall 3 opposite to the second channel 6 gradually decreases, and the thickness of the bottom wall 5 opposite to the second channel 6 gradually decreases, so that the flow area of ​​the second channel 6 gradually increases along the extension path from the second channel 6 to the outlet 41.

[0091] Alternatively, the top wall 3 has a planar plate structure, and along the extension path from the second inlet channel 6 to the outlet 41, the width of the second inlet channel 6 in the longitudinal direction where it intersects with the extension path from the second inlet channel 6 to the outlet 41 gradually increases, so that the flow area of ​​the second inlet channel 6 gradually increases along the extension path from the second inlet channel 6 to the outlet 41. Figure 1 , Figure 10 As shown.

[0092] Example 3

[0093] The difference between this embodiment and embodiments 1 or 2 is that it also includes a connector 7, which connects the fan body 1 to the air guide 8. The portion of the connector 7 opposite to the air guide cavity 2 is provided with at least one vent 73, through which the air guide cavity 2 communicates with the outside. The connector 7 can be specifically fixedly connected to the outer shell of the fan body 1, thereby constructing the fan body 1 and the air guide 8 into an integral module.

[0094] For example, the connector 7 can be multiple partitions 71 discretely disposed between the fan body 1 and the top wall 3. These partitions 71 can be distributed circumferentially along the fan body 1. The opening between two adjacent partitions 71 forms a vent 73, allowing external ambient gas to enter the guide cavity 2. Figures 11-12 As shown;

[0095] The connector 7 can also be a continuous partition plate 72 in a closed loop structure disposed between the fan body 1 and the top wall 3. The partition plate has at least one hole or groove structure, which forms a vent 73, allowing external ambient gas to enter the guide cavity 2. Figure 13 As shown.

[0096] The above description, based on the preferred embodiments of the present invention, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A multi-jet orifice-based airflow fan, characterized in that: Includes a fan body (1) and a flow guide (8) disposed on one or both sides of the fan body (1) with a gap. The gap between the fan body (1) and the flow guide (8) forms a flow guide cavity (2). The flow guide cavity (2) is connected to the outside. The flow guide (8) guides the airflow generated by the fan body (1) to be ejected in a set direction. The fan body (1) has at least two jet hole units (11) spaced apart on the side near the air intake (8). Each jet hole unit (11) contains at least two jet holes (11a) spaced apart. The airflow generated by the fan body (1) is ejected through the jet holes (11a). The drainer (8) includes a drain cavity formed by a top wall (3), a bottom wall (5) and a side wall (4) connecting the top wall (3) and the bottom wall (5). The drain cavity extends in a set direction and penetrates the side wall (4), and forms at least one outlet (41) at the penetration point of the side wall (4). The top wall (3) is located close to the fan body (1). The area of ​​the top wall (3) opposite to the jet hole unit (11) is provided with a first drain channel (31) that corresponds one-to-one with the jet hole unit (11) and penetrates the top wall (3). The first drain channel (31) communicates with the drain cavity. The top wall (3) has a protrusion (32) on the side near the fan body (1) that corresponds to the first flow channel (31), and the first flow channel (31) passes through the corresponding protrusion (32).

2. The multi-jet orifice-based airflow fan according to claim 1, characterized in that: The orthographic projection of the first drainage channel (31) on the fan body (1) completely covers all the jet holes (11a) in the corresponding jet hole unit (11).

3. The multi-jet orifice-based airflow fan according to claim 2, characterized in that: The cross-section of the jet orifice (11a) is circular, and the diameter of the jet orifice (11a) is [missing information]. The axial distance between the outlet end face of the jet orifice (11a) and the inlet end face of the first guide channel (31) is... The protrusion (32) protrudes from the top wall (3) to a height of The jet angle formed by the airflow ejected from the jet hole (11a) is... airflow The spray angle is such that the diameter of the area covered by the jet from the jet hole (11a) to the inlet end face of the first guide channel (31) is [missing information]. The protrusion (32) is a closed ring, and the wall thickness of the protrusion (32) opposite to the inlet end face of the first drainage channel (31) is... The constraints are: ； ； ； ； At the inlet end face of the first drainage channel (31), the cross-section of the first drainage channel (31) covers all the jet holes (11a) constituting the corresponding jet hole unit (11) at a jet angle. The ejected airflow forms a coverage area at the inlet end face of the first inlet channel (31).

4. The multi-jet orifice-based airflow fan according to claim 1, characterized in that: The drainage cavity is provided with a second drainage channel (6) corresponding to the first drainage channel (31). The first drainage channel (31) and the corresponding second drainage channel (6) are connected. The second drainage channel (6) is connected to the outlet (41).

5. The multi-jet orifice-based airflow fan according to claim 4, characterized in that: Each of the first drainage channels (31) is connected to at least two of the second drainage channels (6).

6. The multi-jet orifice-based airflow fan according to claim 4 or 5, characterized in that: The flow area of ​​the second diversion channel (6) gradually increases along the extension path from the second diversion channel (6) to the outlet (41).

7. The multi-jet orifice-based airflow fan according to any one of claims 1-5, characterized in that: The protrusion (32) has at least one of an inner peripheral rounded corner transition area (321), an outer peripheral rounded corner transition area (322), and a rounded corner transition area (323); The inner peripheral rounded transition area (321) is provided on the inner peripheral edge of the top surface of the protrusion (32); The outer peripheral rounded transition area (322) is provided on the outer peripheral edge of the top surface of the protrusion (32); The rounded transition area (323) is located at the junction of the side of the protrusion (32) and the top wall (3).

8. The multi-jet orifice-based airflow fan according to any one of claims 1-5, characterized in that: The side of the protrusion (32) has a draft angle. , .

9. The multi-jet orifice-based airflow fan according to any one of claims 1-5, characterized in that: The flow areas of each jet hole (11a) in the same jet hole unit (11) may be the same or different from each other.

10. The multi-jet orifice-based airflow fan according to any one of claims 1-5, characterized in that: It also includes a connector (7) that connects the fan body (1) to the air guide (8). The part of the connector (7) opposite to the air guide cavity (2) is provided with at least one air vent (73), and the air guide cavity (2) is connected to the outside through the air vent (73).

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