Flow-compensated air extraction fan

Abstract

The present invention relates to the technical field of heat dissipation devices, and particularly to a flow compensation induced-draft fan, which includes a fan body and an inducer. At least two jet holes are provided on one surface of the fan body close to the inducer; the inducer has an open drainage cavity formed by a top wall, a bottom wall and a side wall for jetting air flow in a set direction. The air flow generated by the fan body is jetted through the jet holes to entrain the surrounding gas and form a primary drainage. By setting the flow area of the drainage channel to increase successively along the set direction, or by providing drainage holes at designated positions on the wall surface of the inducer, the air flow will generate at least one secondary drainage when flowing in the open drainage cavity, thereby substantially increasing the air flow rate finally jetted out from the side wall outlet to improve the heat dissipation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation devices, and in particular to a diversion fan with flow compensation. Background Art

[0002] With the development of intelligent and thin-and-light terminal products, the heat load of internal electronic devices has increased significantly, and efficient heat dissipation technology in a narrow space has become an urgent need in the industry. Placing a piezoelectric-driven micro-volume fan as a heat dissipation device in the internal space of a terminal product is considered to be able to generate greater heat benefits, but this also poses new requirements for the structural performance of such heat dissipation devices themselves. The air outlet of a direct jet fan is located on the side in the thickness direction of the fan. During use, it must be stacked with the heat source in the thickness direction, resulting in an increase in the overall thickness. In addition, the air outlet of the fan must be arranged facing the central area of the heat source, and the heat dissipation area is limited. Moreover, the gas carrying heat after heat exchange lacks the power to be guided out of the product, and it is easy to form hot gas retention or hot gas circulation between the fan and the heat source, affecting the heat dissipation efficiency.

[0003] The side jet fan has a lateral air outlet, and the heat source is arranged in the air outflow direction of the fan, overcoming the above problems of the direct jet fan. However, since the air flow direction is inconsistent with the final air outflow direction, the air flow needs to deflect at a large angle in space, and energy loss will occur during this process, resulting in insufficient air flow ejected from the lateral air outlet and failing to achieve the purpose of efficient heat dissipation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to solve the deficiencies of the prior art, a diversion fan with flow compensation is provided to solve the problem that the side jet fan has insufficient air flow ejected from the lateral air outlet due to the inconsistent air flow direction and the large-angle flow deflection of the air flow in space, resulting in energy loss during this process.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a diversion fan with flow compensation, including a fan body and a flow deflector, wherein the flow deflector is arranged on one side or both sides of the fan body;

[0006] At least two jet holes are provided on the surface of the fan body close to the flow deflector corresponding to the flow deflector, and the air flow generated by the fan body is ejected through the jet holes;

[0007] The flow deflector includes a top wall, a side wall and a bottom wall. One end of the side wall close to the fan body is connected to the top wall, and the other end of the side wall far from the fan body is connected to the bottom wall. A gap is left between the surface of the fan body close to the flow deflector and the opposite top wall;

[0008] The top wall, bottom wall, and side wall enclose an open drainage cavity that allows air flow to be ejected in a set direction. The open drainage cavity extends in the set direction through the side wall, and an outflow port is formed at the penetration point of the side wall. At least two of the jet holes are arranged at intervals along the set direction; in the areas of the top wall opposite to the jet holes, drainage channels corresponding to the jet holes one by one and penetrating the top wall are respectively provided, and the drainage channels are all communicated with the open drainage cavity;

[0009] The flow-through area of the drainage channel is larger than the flow-through area of the corresponding jet hole, and the flow-through area of the open drainage cavity shows a gradually increasing trend along the set direction;

[0010] The air flow ejected from the jet holes of the fan body towards the drainage channels is ejected in the set direction under the guidance of the open drainage cavity.

[0011] The first type of solution to further increase the ejected flow rate: the flow-through areas of the drainage channels corresponding to the respective jet holes increase successively along the set direction.

[0012] The second type of solution to further increase the ejected flow rate: the top wall has a first drainage area corresponding to the drainage channel one by one, and the first drainage area is the area on the top wall around the outer peripheral side of the corresponding drainage channel;

[0013] The bottom wall has a second drainage area corresponding to the first drainage area one by one, and the second drainage area and the corresponding first drainage area are opposite to each other;

[0014] At least one first drainage area or / and at least one second drainage area are penetrated by drainage holes communicated with the open drainage cavity.

[0015] Furthermore, the drainage holes are located between two adjacent drainage channels, or / and the drainage holes are located between the drainage channel adjacent to the outflow port and the outflow port.

[0016] Furthermore, the drainage holes are all arranged in the first drainage area.

[0017] The first type of solution to form the open drainage cavity: the area between two adjacent drainage channels in the open drainage cavity is the first flow channel, and the area between the drainage channel adjacent to the outflow port and the outflow port in the open drainage cavity is the second flow channel;

[0018] The height of the first flow channel on the upstream side in the set direction among two adjacent first flow channels < the height of the first flow channel on the downstream side in the set direction, so that the flow-through areas of the respective first flow channels increase successively along the set direction;

[0019] The height of the first flow channel adjacent to the second flow channel < the height of the second flow channel, so that the flow area of the first flow channel adjacent to the second flow channel is smaller than the flow area of the second flow channel.

[0020] Further, along the set direction, the area of the top wall opposite to the open drainage cavity is a plate-like structure with a stepped thickness that gradually thins;

[0021] The thickness of the top wall area corresponding to the position of the first flow channel on the upstream side in the set direction among two adjacent first flow channels < the thickness of the top wall area corresponding to the position of the first flow channel on the downstream side in the set direction;

[0022] The thickness of the top wall area corresponding to the position of the first flow channel adjacent to the second flow channel < the thickness of the top wall area corresponding to the position of the second flow channel;

[0023] The second solution for forming the open drainage cavity: Along the set direction, the area of the top wall opposite to the open drainage cavity is a flat plate-like structure;

[0024] The area between two adjacent drainage channels in the open drainage cavity is the first flow channel, and the area between the drainage channel adjacent to the outlet and the outlet in the open drainage cavity is the second flow channel;

[0025] The set direction intersects with the longitudinal direction;

[0026] The width of the first flow channel on the upstream side in the set direction among two adjacent first flow channels in the longitudinal direction < the width of the first flow channel on the downstream side in the set direction in the longitudinal direction, so that the flow area of each first flow channel increases in sequence along the set direction;

[0027] The width of the first flow channel adjacent to the second flow channel in the longitudinal direction < the width of the second flow channel in the longitudinal direction, so that the flow area of the first flow channel adjacent to the second flow channel is smaller than the flow area of the second flow channel.

[0028] The third solution for forming the open drainage cavity: The upper inner wall surface of the top wall enclosing the open drainage cavity, or / and the lower inner wall surface of the bottom wall enclosing the open drainage cavity is an inclined surface, so that the flow area of the open drainage cavity shows a gradually increasing trend along the set direction;

[0029] The upper inner wall surface gradually approaches the side where the fan body is located along the set direction;

[0030] The lower inner wall surface gradually moves away from the side where the fan body is located along the set direction.

[0031] Further, a buffer flow channel with an opening facing the outflow port is formed among the top wall, the side wall and the bottom wall. The drainage channel of the open drainage cavity that is farthest from the outflow port is the inner-end drainage channel. The buffer flow channel is located on the side of the inner-end drainage channel away from the outflow port. The opening of the buffer flow channel communicates with the part of the open drainage cavity facing the inner-end drainage channel.

[0032] Further, the flow-through areas of at least two of the jet holes are the same or different.

[0033] Further, the flow-through area of the drainage channel is 1.1 to 10 times that of the corresponding jet hole.

[0034] Further, a partition plate is further included. The fan body is joined to the drainer through the partition plate;

[0035] The partition plate is a plurality of partition bodies discretely arranged between the fan body and the top wall. The openings between two adjacent partition bodies form flow-through holes, and the flow-through holes enable the external environmental gas to enter the gap between the fan body and the drainer;

[0036] Or the partition plate is a continuous partition plate in a closed-loop structure arranged between the fan body and the top wall. At least one hole structure or groove structure is arranged on the partition plate, and the hole structure or groove structure forms a flow-through hole, and the flow-through hole enables the external environmental gas to enter the gap between the fan body and the drainer.

[0037] The beneficial effects of the present invention are as follows:

[0038] 1) In the present invention, the air flow generated by the fan body is ejected through the jet holes, entraining the gas circumferentially outside the area opposite to the jet holes in the gap between the fan body and the drainer, forming primary drainage. After the fluid enters the open drainage cavity, the flow direction deflects. Although energy loss occurs, the air flow has high inertia after being rectified by the drainage channel and can still maintain a certain momentum to flow through the open drainage cavity and finally be ejected from the outflow port on the side wall;

[0039] 2) In the present invention, since the flow-through area of the open drainage cavity gradually increases along the set direction, when the air flow passes through the open drainage cavity, the pressure is restored while the speed decreases, which can increase the flow rate;

[0040] 3) In the present invention, since the flow-through areas of the respective drainage channels arranged along the set direction gradually increase, for two adjacent drainage channels, the air flow flowing from the upstream-side drainage channel into the open drainage cavity flows through the open drainage cavity. Since the flow-through area of the downstream-side drainage channel is relatively large, when the air flow in the open drainage cavity flows through the downstream-side drainage channel, it will further drag the air flow flowing in the downstream-side drainage channel, thereby generating a stronger entrainment effect between the downstream-side drainage channel and the jet holes arranged opposite thereto, forming a secondary drainage, thereby substantially increasing the air flow rate flowing from the downstream-side drainage channel into the open drainage cavity, and ultimately further increasing the air flow rate ejected from the outlet, so as to improve the heat dissipation efficiency.

[0041] 4) In the present invention, since the top wall has a first drainage area corresponding to each drainage channel one by one, the first drainage area is the area on the top wall around the outer peripheral side of the corresponding drainage channel; the bottom wall has a second drainage area corresponding to the first drainage area one by one, and the second drainage area corresponds to the first drainage area. At least one first drainage area or / and at least one second drainage area is penetrated by a drainage hole communicating with the open drainage cavity. Preferably, the drainage hole is located between two adjacent drainage channels, or / and the drainage hole is located between the drainage channel adjacent to the outlet and the outlet, so that when the air flow flows through the open drainage cavity, it will also generate a pulling effect on the gas in the drainage hole, thereby generating at least one secondary drainage, and further substantially increasing the air flow rate finally ejected from the side wall outlet, so as to improve the heat dissipation efficiency.

[0042] Other features and advantages of the present application will become clear through the following detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings. Description of the Drawings

[0043] The present invention will be further described below in conjunction with the drawings and embodiments.

[0044] Figure 1 Schematic diagram of a drainage fan for flow compensation;

[0045] Figure 2 Cross-sectional view of the drainage device in Embodiment 1;

[0046] Figure 3 Cross-sectional view of the drainage device in Embodiment 2;

[0047] Figure 4 Cross-sectional view of the drainage device in Embodiment 3;

[0048] Figure 5 Schematic diagram showing that the widths of the first flow channel I, the first flow channel II and the second flow channel in Embodiment 3 gradually increase;

[0049] Figure 6Schematic cross-sectional view of the drainer in Example 4;

[0050] Figure 7 Schematic view of the flow-compensated drain fan with a partition plate configured in Example 6;

[0051] Figure 8 Schematic view of the flow-compensated drain fan in Example 7;

[0052] Figure 9 Schematic cross-sectional view of the drainer in Example 7;

[0053] Figure 10 Schematic cross-sectional view of the drainer in Example 8;

[0054] Figure 11 Schematic cross-sectional view of the drainer in Example 9;

[0055] Figure 12 Schematic view of the widths of the first flow channel I, the first flow channel II, and the second flow channel increasing in sequence in Example 9;

[0056] Figure 13 Schematic cross-sectional view of the drainer in Example 10;

[0057] Figure 14 Schematic view of the flow-compensated drain fan with a partition plate configured in Example 12;

[0058] Figure 15 Schematic view of the distribution of the first drainage area on the top wall;

[0059] Figure 16 Schematic view of the distribution of the second drainage area on the top wall.

[0060] In the figure: 1. Fan body, 11. Jet holes;

[0061] 2. Drainer; 21. Top wall, 21a. Upper inner wall surface, 21-1. First drainage area, 211. Drainage holes, 22. Side wall, 23. Bottom wall, 23a. Lower inner wall surface, 23-1. Second drainage area;

[0062] 3. Gap;

[0063] 4. Drainage channels, 41. Drainage channel I, 42. Drainage channel II, 43. Drainage channel III;

[0064] 5. Open drainage cavity, 51. First flow channel, 511. First flow channel I, 512. First flow channel II, 52. Second flow channel;

[0065] 6. Outlet;

[0066] 7. Buffer flow channel;

[0067] 8. Partition plate, 81. Flow through hole. Detailed implementation mode

[0068] The present invention will now be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner. Therefore, they only show the components related to the present invention. Directions and references (such as up, down, left, right, etc.) can only be used to assist in the description of the features in the drawings. Therefore, the following specific implementation modes are not adopted in a restrictive sense, and the scope of the claimed subject matter is only defined by the appended claims and their equivalent forms.

[0069] Embodiment 1

[0070] As Figure 1 shown, a flow compensation induced draft fan, which can be used as a heat dissipation device for internal electronic components of intelligent terminal products, includes a fan body 1 and an inducer 2 arranged on one side or both sides of the fan body 1 with a gap 3 therebetween; the inducer 2 guides 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 6 of the induced draft fan in this embodiment faces the heat source, so as to realize the heat dissipation of the heat source by using the induced draft fan in this embodiment.

[0071] On one side of the fan body 1 close to the inducer 2, at least two jet holes 11 are arranged along the set direction. The shape of the jet holes 11 can be circular, or square, rectangular, oval or other shapes, which are not limited herein. In addition, the flow through areas of at least two jet holes 11 can be the same or different. In this embodiment, the shape of the jet holes 11 is circular and the flow through areas of at least two jet holes 11 are the same for illustration, but this does not constitute a limitation to the present invention.

[0072] The airflow generated by the fan body 1 is ejected through the jet holes 11. The inducer 2 includes a top wall 21, a side wall 22 and a bottom wall 23. One end of the side wall 22 close to the jet holes 11 is connected to the top wall 21, so that the top wall 21 of the inducer 2 is arranged close to the fan body 1. One end of the side wall 22 far from the jet holes 11 is connected to the bottom wall 23. A gap 3 is left between the surface of the fan body 1 close to the inducer 2 and the opposite top wall 21;

[0073] An open drainage cavity 5 for ejecting the airflow in the set direction is enclosed between the top wall 21, the bottom wall 23 and the side wall 22. The open drainage cavity 5 extends in the set direction and penetrates the side wall 22, and an outlet 6 is formed at the penetration of the side wall 22. The open drainage cavity 5 is communicated with the outlet 6. At least two jet holes 11 are arranged at intervals along the set direction; Drainage channels 4 corresponding to the jet holes 11 one by one and penetrating the top wall 21 are respectively arranged in the areas of the top wall 21 opposite to the jet holes 11, and the drainage channels 4 are all communicated with the open drainage cavity 5;

[0074] The air flow ejected from the jet holes 11 of the fan body 1 towards the drainage channel 4 is ejected towards the set direction under the guidance of the open drainage cavity 5. It is not difficult to understand that the jet holes 11 provided on the fan body 1 are opposite to the top wall 21 of the drainer 2, and the outlet 6 is provided on the side wall 22 that encloses the open drainage cavity 5. After the air flow is ejected from the jet holes 11 of the fan body 1, the flow direction deflects under the action of the drainer 2, so that the drainage fan of this embodiment has the function of lateral jet flow.

[0075] Similarly, the cross-sectional shape of the drainage channel 4 can be either circular, or square, rectangular, elliptical or other shapes, which is not limited herein. In this embodiment, the cross-sectional shape of the drainage channel 4 is taken as circular for illustration, but this does not constitute a limitation to the present invention. The flow-through area of the drainage channel 4 is larger than the flow-through area of the corresponding jet hole 11. Preferably, the flow-through area of the drainage channel 4 is 1.1 to 10 times the flow-through area of the corresponding jet hole 11, so that the air flow ejected from the jet hole 11 can be received by the drainage channel 4, avoiding the flow loss caused by wall reflection;

[0076] The flow-through areas of the respective drainage channels 4 opposite to the respective jet holes 11 gradually increase in sequence along the set direction;

[0077] The flow-through area of the open drainage cavity 5 shows a gradually increasing trend along the set direction, as Figure 1 shown.

[0078] The area in the open drainage cavity 5 between two adjacent drainage channels 4 is the first flow channel 51, that is, the part between two adjacent drainage channels 4 on the top wall 21 and the bottom wall 23 and the side wall 22 enclose the first flow channel 51 towards the set direction. The area in the open drainage cavity 5 between the drainage channel 4 adjacent to the outlet 6 and the outlet 6 is the second flow channel 52, that is, the part between the drainage channel 4 adjacent to the outlet 6 on the top wall 21 and the outlet 6 and the bottom wall 23 and the side wall 22 enclose the second flow channel 52 towards the set direction;

[0079] The height of the first flow channel 51 on the upstream side in the set direction among two adjacent first flow channels 51 < the height of the first flow channel 51 on the downstream side in the set direction, so that the flow-through areas of the respective first flow channels 51 gradually increase in sequence along the set direction, and the air flow flows from the upstream side to the downstream side along the set direction; the height of the first flow channel 51 adjacent to the second flow channel 52 < the height of the second flow channel 52, so that the flow-through area of the first flow channel 51 adjacent to the second flow channel 52 is smaller than the flow-through area of the second flow channel 52.

[0080] Specifically, along the set direction, the region of the top wall 21 opposite to the open drainage cavity 5 is a stepped plate-like structure with a gradually decreasing overall thickness; the thickness of the region of the top wall 21 corresponding to the first flow channel 51 on the upstream side in the set direction among two adjacent first flow channels 51 > the thickness of the region of the top wall 21 corresponding to the first flow channel 51 on the downstream side in the set direction; the thickness of the region of the top wall 21 corresponding to the first flow channel 51 adjacent to the second flow channel 52 > the thickness of the region of the top wall 21 corresponding to the second flow channel 52, so that the flow area of the open drainage cavity 5 shows a gradually increasing trend along the set direction;

[0081] That is, the flow areas of the first flow channel 51 and the second flow channel 52 can be determined by setting the thickness of the part between two adjacent drainage channels 4 on the top wall 21 and the thickness of the part between the drainage channel 4 adjacent to the outlet 6 and the outlet 6 on the top wall 21, so that the flow areas of the respective first flow channels 51 increase successively along the set direction, and the flow area of the first flow channel 51 adjacent to the second flow channel 52 is smaller than the flow area of the second flow channel 52.

[0082] For example, as Figure 2 shown, along the set direction, the drainage channels 4 penetrating the top wall 21 are the drainage channel I 41, the drainage channel II 42, and the drainage channel III 43 respectively. The first flow channel 51 formed by the region between the drainage channel I 41 and the drainage channel II 42, the bottom wall 23, and the side wall 22 facing the set direction is the first flow channel I 511. The first flow channel 51 formed by the part between the drainage channel II 42 and the drainage channel III 43, the bottom wall 23, and the side wall 22 facing the set direction is the first flow channel II 512. Among them, the thickness of the region between the drainage channel I 41 and the drainage channel II 42 on the top wall 21 opposite to the open drainage cavity 5 is H1, the thickness of the region between the drainage channel II 42 and the drainage channel III 43 of the top wall 21 opposite to the open drainage cavity 5 is H2, and the thickness of the region between the drainage channel 4 adjacent to the outlet 6 and the outlet 6 on the top wall 21 opposite to the open drainage cavity 5 is H3. When H1 > H2 > H3, it is obvious that the flow areas of the first flow channel I 511, the first flow channel II 512, and the second flow channel 52 increase successively along the set direction.

[0083] Thus, by disposing the flow guide 2 on one or both sides of the fan body 1 with a gap 3 therebetween, at least two jet holes 11 are provided along a set direction on the side of the fan body 1 close to the flow guide 2. A flow guide channel 4 penetrating the top wall 21 is provided in the area of the top wall 21 surrounding the flow guide 2 opposite to the jet holes 11. The airflow generated by the fan body 1 is ejected through the jet holes 11, entraining the gas circumferentially outside the area opposite to the jet holes 11 in the gap 3 between the fan body 1 and the flow guide 2 to form primary drainage. After the fluid enters the open drainage cavity 5, the flow direction deflects. Although there is energy loss, the airflow has high inertia after being rectified by the flow guide channel 4 and can still maintain a certain momentum to flow through the open drainage cavity 5 and finally be ejected from the outflow port 6 on the side wall 22. During this process:

[0084] On the one hand, since the flow-through area of the open drainage cavity 5 gradually increases along the set direction, when the airflow flows through the open drainage cavity 5, it decelerates while restoring pressure, which can increase the flow rate.

[0085] On the other hand, since the flow-through areas of the respective flow guide channels 4 provided along the set direction increase in sequence, for two adjacent flow guide channels 4: the airflow flowing into the open drainage cavity 5 from the flow guide channel 4 relatively far from the outflow port 6 flows through the open drainage cavity 5. When the airflow in the open drainage cavity 5 flows through the flow guide channel 4 relatively close to the outflow port 6, because the flow-through area of the flow guide channel 4 relatively close to the outflow port 6 is relatively large, it will further drag the airflow flowing in the flow guide channel 4 relatively close to the outflow port 6, so that a stronger entrainment effect is generated between the flow guide channel 4 relatively close to the outflow port 6 and the jet holes 11 opposite thereto, forming secondary drainage, thereby substantially increasing the airflow flow rate flowing into the open drainage cavity 5 from the flow guide channel 4 relatively close to the outflow port 6, and finally further increasing the airflow flow rate ejected from the outflow port 6 to improve the heat dissipation efficiency.

[0086] The fan body 1 in this embodiment can adopt any one of the existing technologies of fans with at least two air outlets, especially any one of the piezoelectric fans with at least two air outlets in the existing technology. The airflow generated by the fan body 1 is ejected from the air outlets, and the air outlets are the jet holes 11 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 the Chinese patent with the publication number CN119084287A, and the hole part in this patent corresponds to the jet holes 11 in this embodiment. The fan body 1 in this embodiment can also adopt the fluid generating device with high-order resonance disclosed in the Chinese patent with the publication number CN118979867A, and the hole part in this patent corresponds to the jet holes 11 in this embodiment.

[0087] Embodiment 2

[0088] The difference between Example 2 and Example 1 is that: a buffer flow channel 7 with an opening facing the outflow port 6 is further enclosed among the top wall 21, the side wall 22 and the bottom wall 23. The open drainage cavity 5 is located at the inner end drainage channel of the drainage channel 4 farthest from the outflow port 6. The buffer flow channel 7 is located on the side of the inner end drainage channel away from the outflow port 6. The opening of the buffer flow channel 7 communicates with the part of the open drainage cavity 5 facing the inner end drainage channel; so as to weaken as much as possible the energy attenuation during the flow direction deflection when the air flows into the open drainage cavity 5 through the drainage channel 4 farthest from the outflow port 6, as Figure 3 shown.

[0089] Example 3

[0090] The difference between this example and Example 1 or 2 is that: along the set direction, the area of the top wall 21 opposite to the open drainage cavity 5 is in a flat plate-like structure;

[0091] The area in the open drainage cavity 5 between two adjacent drainage channels 4 is the first flow channel 51, and the area in the open drainage cavity 5 between the drainage channel 4 adjacent to the outflow port 6 and the outflow port 6 is the second flow channel 52;

[0092] The set direction intersects with the longitudinal direction. For example, the set direction is perpendicular to the longitudinal direction;

[0093] The width of the first flow channel 51 on the upstream side of the set direction among two adjacent first flow channels 51 in the longitudinal direction < the width of the first flow channel 51 on the downstream side of the set direction in the longitudinal direction, so that the flow area of each first flow channel 51 increases in sequence along the set direction;

[0094] The width of the first flow channel 51 adjacent to the second flow channel 52 in the longitudinal direction < the width of the second flow channel 52 in the longitudinal direction, so that the flow area of the first flow channel 51 adjacent to the second flow channel 52 is smaller than the flow area of the second flow channel 52;

[0095] So that the flow area of the open drainage cavity 5 shows a gradually increasing trend along the set direction.

[0096] For example, as Figures 4 - 5As shown, along the set direction, the drainage channels 4 penetrating the top wall 21 are respectively a drainage channel I 41, a drainage channel II 42, and a drainage channel III 43. The area between the drainage channel I 41 and the drainage channel II 42 and the bottom wall 23 and the side wall 22 encloses a first flow channel 51 facing the set direction, which is a first flow channel I 511. The part between the drainage channel II 42 and the drainage channel III 43 and the bottom wall 23 and the side wall 22 encloses a first flow channel 51 facing the set direction, which is a first flow channel II 512. Among them, the width dimension of the first flow channel I 511 in the longitudinal direction is W1, the width dimension of the first flow channel II 512 in the longitudinal direction is W2, and the width dimension of the second flow channel 52 in the longitudinal direction is W3. When W1 < W2 < W3, it is obvious that the flow areas of the first flow channel I 511, the first flow channel II 512, and the second flow channel 52 increase in sequence along the set direction.

[0097] Embodiment 4

[0098] The difference between this embodiment and Embodiment 3 is that: a buffer flow channel 7 with an opening facing the outlet 6 is also enclosed between the top wall 21, the side wall 22, and the bottom wall 23. The open drainage cavity 5 is located at the drainage channel 4 farthest from the outlet 6, which is the inner end drainage channel. The buffer flow channel 7 is located on the side of the inner end drainage channel away from the outlet 6, and the opening of the buffer flow channel 7 is communicated with the part of the open drainage cavity 5 facing the inner end drainage channel; so as to weaken as much as possible the energy attenuation during the flow direction deflection when the air flows into the open drainage cavity 5 through the drainage channel 4 farthest from the outlet 6, as Figure 6 shown.

[0099] Embodiment 5

[0100] The difference between this embodiment and any one of Embodiments 1 - 4 is that: as Figure 1 shown, the upper inner wall surface 21a of the top wall 21 enclosing the open drainage cavity 5, or / and the lower inner wall surface 23a of the bottom wall 23 enclosing the open drainage cavity 5 is / are inclined surfaces; that is, in the first case: the upper inner wall surface 21a of the top wall 21 enclosing the open drainage cavity 5 is an inclined surface, in the second case: the lower inner wall surface 23a of the bottom wall 23 enclosing the open drainage cavity 5 is an inclined surface, and in the third case: the upper inner wall surface 21a of the top wall 21 enclosing the open drainage cavity 5 and the lower inner wall surface 23a of the bottom wall 23 enclosing the open drainage cavity 5 are inclined surfaces.

[0101] The upper inner wall surface 21a gradually approaches the side where the fan body 1 is located along the set direction; the lower inner wall surface 23a gradually moves away from the side where the fan body 1 is located along the set direction; so as to realize that the flow area of the open drainage cavity 5 shows a gradually increasing trend along the set direction.

[0102] Embodiment 6

[0103] The difference between this embodiment and any one of Embodiments 1-5 lies in that: as Figure 7 shown, it further includes a partition plate 8. The fan body 1 is joined to the flow deflector 2 through the partition plate 8. The partition plate 8 can be specifically fixedly connected to the housing of the fan body 1;

[0104] The partition plate 8 is a plurality of partition bodies discretely arranged between the fan body 1 and the top wall 21. The plurality of partition bodies can be distributed at intervals along the circumferential direction of the fan body 1. The openings between two adjacent partition bodies form flow holes 81, and the flow holes 81 enable the external environmental gas to enter the gap 3 between the fan body 1 and the flow deflector 2;

[0105] Or the partition plate 8 is a continuous partition plate 8 with a closed-loop structure arranged between the fan body 1 and the top wall 21. The partition plate 8 can be annular. At least one hole structure or groove structure is provided on the partition plate 8, and the hole structure or groove structure forms the flow hole 81, and the flow hole 81 enables the external environmental gas to enter the gap 3 between the fan body 1 and the flow deflector 2.

[0106] Thus, the fan body 1 and the flow deflector 2 can be constructed into an integral module.

[0107] In addition, it should be noted that the setting of the partition plate 8 does not interfere with the air flow generation process of the fan body 1, and the setting of the partition plate 8 makes the jet holes 11 exposed on the side of the partition plate 8 facing the flow deflector 2.

[0108] Embodiment 7

[0109] As Figure 8 shown, a flow compensation type flow deflector fan, which can be used as a heat dissipation device for internal electronic components of an intelligent terminal product, includes a fan body 1 and a flow deflector 2 arranged on one side or both sides of the fan body 1 with a gap 3 therebetween; the flow deflector 2 guides the air flow generated by the fan body 1 to be ejected in a set direction; the set direction refers to the direction in which the outlet 6 of the flow deflector fan of this embodiment faces the heat source, so as to realize the heat dissipation of the heat source by using the flow deflector fan of this embodiment.

[0110] At least two jet holes 11 are arranged along the set direction on the side of the fan body 1 close to the flow deflector 2. The shape of the jet holes 11 can be circular, or can be square, rectangular, oval or other shapes, which are not limited herein. In addition, the flow areas of at least two jet holes 11 can be the same or different. In this embodiment, the shape of the jet holes 11 is circular and the flow areas of at least two jet holes 11 are the same for illustration, but this does not constitute a limitation to the present invention.

[0111] The air flow generated by the fan body 1 is ejected through the jet holes 11. The flow deflector 2 includes a top wall 21, a side wall 22 and a bottom wall 23. One end of the side wall 22 close to the jet holes 11 is connected to the top wall 21, so that the top wall 21 of the flow deflector 2 is arranged close to the fan body 1. One end of the side wall 22 away from the jet holes 11 is connected to the bottom wall 23. There is a gap 3 between the surface of the fan body 1 on the side close to the flow deflector 2 and the opposite top wall 21.

[0112] An open drainage cavity 5 for ejecting the air flow in a set direction is enclosed among the top wall 21, the bottom wall 23 and the side wall 22. The open drainage cavity 5 extends in the set direction and penetrates through the side wall 22, and an outflow port 6 is formed at the penetration of the side wall 22. The open drainage cavity 5 is communicated with the outflow port 6. At least two jet holes 11 are arranged at intervals in the set direction. Drainage channels 4 corresponding to the jet holes 11 one by one and penetrating through the top wall 21 are respectively arranged in the areas of the top wall 21 opposite to the jet holes 11. The drainage channels 4 are all communicated with the open drainage cavity 5.

[0113] The air flow ejected from the jet holes 11 of the fan body 1 towards the drainage channels 4 is ejected in the set direction under the guidance of the open drainage cavity 5. It is not difficult to understand that the jet holes 11 arranged on the fan body 1 are opposite to the top wall 21 of the flow deflector 2, and the outflow port 6 is arranged on the side wall 22 enclosing the open drainage cavity 5. After the air flow is ejected from the jet holes 11 of the fan body 1, the flow direction deflects under the action of the flow deflector 2, so that the drainage fan of this embodiment has the function of lateral jet flow.

[0114] Similarly, the cross-sectional shape of the drainage channel 4 can be circular, or square, rectangular, oval or other shapes, which is not limited herein. In this embodiment, the cross-sectional shape of the drainage channel 4 is taken as circular for illustration, but this does not constitute a limitation to the present invention. The flow-through area of the drainage channel 4 is larger than the flow-through area of the corresponding jet hole 11. Preferably, the flow-through area of the drainage channel 4 is 1.1 to 10 times the flow-through area of the corresponding jet hole 11, so that the air flow ejected from the jet hole 11 can be received by the drainage channel 4, and the flow loss caused by wall contact reflection can be avoided.

[0115] The top wall 21 has first drainage areas 21-1 corresponding to the drainage channels 4 one by one. The first drainage areas 21-1 are the areas on the top wall 21 around the outer peripheral sides of the corresponding drainage channels 4.

[0116] The bottom wall 23 has second drainage areas 23-1 corresponding to the first drainage areas 21-1 one by one. The second drainage areas 23-1 and the corresponding first drainage areas 21-1 are opposite to each other. It should be noted that the first drainage areas 21-1 of two adjacent drainage channels 4 can intersect or be separated from each other, as Figure 15 shown;

[0117] At least one first drainage area 21-1 or / and at least one second drainage area 23-1 is / are penetrated by drainage holes 211 communicating with the open drainage cavity 5, and two adjacent second drainage areas 23-1 may intersect or be separated from each other, as Figure 16 shown.

[0118] Preferably, the drainage holes 211 are located between two adjacent drainage channels 4, or / and the drainage holes 211 are located between the drainage channel 4 adjacent to the outlet 6 and the outlet 6; it should be noted that: the drainage holes 211 located between two adjacent drainage channels 4 may be located in the first drainage area 21-1 or in the second drainage area 23-1.

[0119] That is, it can be the following three solutions:

[0120] Solution 1: The top wall 21 or the bottom wall 23 is penetrated by drainage holes 211 in at least a part between two adjacent drainage channels 4, and even, the top wall 21 or the bottom wall 23 is penetrated by drainage holes 211 in all parts between two adjacent drainage channels 4;

[0121] Solution 2: The top wall 21 or the bottom wall 23 is penetrated by drainage holes 211 in the part between the drainage channel 4 adjacent to the outlet 6 and the outlet 6;

[0122] Solution 3: The top wall 21 or the bottom wall 23 is penetrated by drainage holes 211 in at least a part between two adjacent drainage channels 4; and, the top wall 21 or the bottom wall 23 is penetrated by drainage holes 211 in the part between the drainage channel 4 adjacent to the outlet 6 and the outlet 6;

[0123] More preferably, the drainage holes 211 located between two adjacent drainage channels 4 are located in the first drainage area 21-1.

[0124] The flow-through area of the open drainage cavity 5 shows a gradually increasing trend along the set direction, as Figure 8 shown.

[0125] The area between two adjacent drainage channels 4 in the open drainage cavity 5 is the first flow channel 51, that is, the part between two adjacent drainage channels 4 on the top wall 21 and the bottom wall 23 and the side wall 22 enclose the first flow channel 51 facing the set direction, and the area between the drainage channel 4 adjacent to the outlet 6 and the outlet 6 in the open drainage cavity 5 is the second flow channel 52, that is, the part between the drainage channel 4 adjacent to the outlet 6 on the top wall 21 and the outlet 6 and the bottom wall 23 and the side wall 22 enclose the second flow channel 52 facing the set direction;

[0126] The height of the first flow channel 51 on the upstream side in the set direction among two adjacent first flow channels 51 < the height of the first flow channel 51 on the downstream side in the set direction, so that the flow area of each first flow channel 51 increases successively along the set direction, and the air flow flows from the upstream side to the downstream side along the set direction; the height of the first flow channel 51 adjacent to the second flow channel 52 < the height of the second flow channel 52, so that the flow area of the first flow channel 51 adjacent to the second flow channel 52 is smaller than the flow area of the second flow channel 52.

[0127] Specifically, along the set direction, the region of the top wall 21 opposite to the open drainage cavity 5 is a stepped plate-like structure with the overall thickness gradually thinning; the thickness of the region of the top wall 21 corresponding to the position of the first flow channel 51 on the upstream side in the set direction among two adjacent first flow channels 51 > the thickness of the region of the top wall 21 corresponding to the position of the first flow channel 51 on the downstream side in the set direction; the thickness of the region of the top wall 21 corresponding to the position of the first flow channel 51 adjacent to the second flow channel 52 > the thickness of the region of the top wall 21 corresponding to the position of the second flow channel 52, so that the flow area of the open drainage cavity 5 shows a gradually increasing trend along the set direction;

[0128] That is, the flow areas of the first flow channel 51 and the second flow channel 52 can be determined by setting the thickness of the part between two adjacent drainage channels 4 on the top wall 21 and the thickness of the part between the drainage channel 4 adjacent to the outlet 6 and the outlet 6 on the top wall 21, so that the flow area of each first flow channel 51 increases successively along the set direction, and the flow area of the first flow channel 51 adjacent to the second flow channel 52 is smaller than the flow area of the second flow channel 52.

[0129] For example, as Figure 9As shown, along the set direction, the drainage channels 4 penetrating through the top wall 21 are respectively a drainage channel I 41, a drainage channel II 42, and a drainage channel III 43. The area between the drainage channel I 41 and the drainage channel II 42 and the bottom wall 23 and the side wall 22 enclose a first flow channel 51 facing the set direction, which is a first flow channel I 511. The part between the drainage channel II 42 and the drainage channel III 43 and the bottom wall 23 and the side wall 22 enclose a first flow channel 51 facing the set direction, which is a first flow channel II 512. Among them, the thickness of the area between the drainage channel I 41 and the drainage channel II 42 on the top wall 21 opposite to the open drainage cavity 5 is H1, the thickness of the part between the drainage channel II 42 and the drainage channel III 43 on the top wall 21 opposite to the open drainage cavity 5 is H2, and the thickness of the area between the drainage channel 4 on the top wall 21 adjacent to the outlet 6 and the outlet 6 opposite to the open drainage cavity 5 is H3. When H1 > H2 > H3, obviously, the flow area of the first flow channel I 511, the flow area of the first flow channel II 512, and the second flow channel 52 will increase in sequence along the set direction.

[0130] Drainage holes 211 penetrate through the area of the top wall 21 opposite to at least one first flow channel 51, or / and drainage holes 211 penetrate through the area of the top wall 21 opposite to the second flow channel 52.

[0131] Thus, by arranging the drainer 2 on one side or both sides of the fan body 1 with a gap 3 therebetween, at least two jet holes 11 are arranged along the set direction on the side of the fan body 1 close to the drainer 2. The area of the top wall 21 enclosing the drainer 2 opposite to the jet holes 11 is provided with drainage channels 4 penetrating through the top wall 21. The airflow generated by the fan body 1 is ejected through the jet holes 11, entraining the gas in the circumferential direction of the area opposite to the jet holes 11 in the gap 3 between the fan body 1 and the drainer 2 to form primary drainage, so that after the fluid enters the open drainage cavity 5, the flow direction deflects. Although there is energy loss, the airflow has high inertia after being rectified by the drainage channels 4 and can still maintain a certain momentum to pass through the open drainage cavity 5 and finally be ejected from the outlet 6 on the side wall 22. In this process:

[0132] On the one hand, since the flow area of the open drainage cavity 5 shows a gradually increasing trend along the set direction, when the airflow passes through the open drainage cavity 5, it decelerates while restoring pressure, which can improve the flow rate. On the other hand, since at least one first drainage area 21-1 or / and at least one second drainage area 23-1 penetrate through drainage holes 211 communicating with the open drainage cavity 5, when the airflow passes through the open drainage cavity 5, it will also generate a pulling effect on the gas in the drainage holes 211, thereby generating at least one secondary drainage, and further substantially increasing the airflow rate finally ejected from the outlet 6 on the side wall 22 to improve the heat dissipation efficiency.

[0133] The fan body 1 in this embodiment can adopt any one of the existing technologies of fans with at least two air outlets, especially any one of the piezoelectric fans with at least two air outlets in the existing technology. The air flow generated by the fan body 1 is ejected from the air outlets, and the air outlets are the jet holes 11 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 the Chinese patent with the publication number CN119084287A, and the hole part in this patent corresponds to the jet hole 11 in this embodiment. The fan body 1 in this embodiment can also adopt the fluid generating device with high-order resonance disclosed in the Chinese patent with the publication number CN118979867A, and the hole part in this patent corresponds to the jet hole 11 in this embodiment.

[0134] Embodiment 8

[0135] The difference between Embodiment 8 and Embodiment 7 is that: a buffer flow channel 7 with an opening facing the outflow port 6 is further enclosed between the top wall 21, the side wall 22 and the bottom wall 23. The open drainage cavity 5 is located in the drainage channel 4 farthest from the outflow port 6 as the inner end drainage channel. The buffer flow channel 7 is located on the side of the inner end drainage channel away from the outflow port 6, and the opening of the buffer flow channel 7 communicates with the part of the open drainage cavity 5 facing the inner end drainage channel; so as to weaken the energy attenuation during the flow direction deflection of the air flow flowing into the open drainage cavity 5 through the drainage channel 4 farthest from the outflow port 6 as much as possible, as Figure 10 shown.

[0136] Embodiment 9

[0137] The difference between this embodiment and Embodiment 7 or 8 is that: along the set direction, the area of the top wall 21 opposite to the open drainage cavity 5 is in a flat plate-like structure;

[0138] The area between adjacent two drainage channels 4 in the open drainage cavity 5 is the first flow channel 51, and the area between the drainage channel 4 adjacent to the outflow port 6 and the outflow port 6 in the open drainage cavity 5 is the second flow channel 52;

[0139] The set direction intersects with the longitudinal direction. For example, the set direction is perpendicular to the longitudinal direction;

[0140] The width of the first flow channel 51 located on the upstream side of the set direction in the longitudinal direction among adjacent two first flow channels 51 < the width of the first flow channel 51 located on the downstream side of the set direction in the longitudinal direction, so that the flow area of each first flow channel 51 increases sequentially along the set direction;

[0141] The width of the first flow channel 51 adjacent to the second flow channel 52 in the longitudinal direction < the width of the second flow channel 52 in the longitudinal direction, so that the flow area of the first flow channel 51 adjacent to the second flow channel 52 is smaller than the flow area of the second flow channel 52.

[0142] For example, as Figures 11 - 12 shown, along the set direction, the drainage channels 4 penetrating through the top wall 21 are respectively the drainage channel I 41, the drainage channel II 42, and the drainage channel III 43. The area between the drainage channel I 41 and the drainage channel II 42 and the bottom wall 23 and the side wall 22 enclose the first flow channel 51 facing the set direction, which is the first flow channel I 511. The part between the drainage channel II 42 and the drainage channel III 43 and the bottom wall 23 and the side wall 22 enclose the first flow channel 51 facing the set direction, which is the first flow channel II 512. Among them, the width dimension of the first flow channel I 511 in the longitudinal direction is W1, the width dimension of the first flow channel II 512 in the longitudinal direction is W2, and the width dimension of the second flow channel 52 in the longitudinal direction is W3. When W1 < W2 < W3, obviously, the flow areas of the first flow channel I 511, the first flow channel II 512, and the second flow channel 52 will increase in sequence along the set direction.

[0143] Example 10

[0144] The difference between this example and Example 9 is that: a buffer flow channel 7 with an opening facing the outlet 6 is also enclosed among the top wall 21, the side wall 22, and the bottom wall 23. The open drainage cavity 5 is located at the drainage channel 4 farthest from the outlet 6, which is the inner end drainage channel. The buffer flow channel 7 is located on the side of the inner end drainage channel away from the outlet 6. The opening of the buffer flow channel 7 is communicated with the part of the open drainage cavity 5 facing the inner end drainage channel; so as to weaken as much as possible the energy attenuation during the flow direction deflection when the air flows into the open drainage cavity 5 through the drainage channel 4 farthest from the outlet 6, as Figure 13 shown;

[0145] Example 11

[0146] The difference between this example and any one of Examples 7 - 10 is that: as Figure 8 shown, the upper inner wall surface 21a of the top wall 21 enclosing the open drainage cavity 5, or / and the lower inner wall surface 23a of the bottom wall 23 enclosing the open drainage cavity 5 is / are inclined planes;

[0147] The upper inner wall surface 21a gradually approaches the side where the fan body 1 is located along the set direction;

[0148] The lower inner wall surface 23a gradually moves away from the side where the fan body 1 is located along the set direction, so as to realize the trend that the flow area of the open drainage cavity 5 gradually increases along the set direction.

[0149] Example 12

[0150] The difference between this example and any one of Examples 7 - 11 is that: as Figure 14As shown, it further includes a partition plate 8. The fan body 1 is joined to the flow deflector 2 through the partition plate 8. The partition plate 8 can be specifically fixedly connected to the housing of the fan body 1.

[0151] The partition plate 8 is a plurality of partition bodies discretely arranged between the fan body 1 and the top wall 21. The plurality of partition bodies can be distributed at intervals along the circumferential direction of the fan body 1. The openings between two adjacent partition bodies form flow holes 81. The flow holes 81 enable the external ambient gas to enter the gap 3 between the fan body 1 and the flow deflector 2.

[0152] Or the partition plate 8 is a continuous partition plate 8 in a closed-loop structure arranged between the fan body 1 and the top wall 21. The partition plate 8 can be annular. At least one hole structure or groove structure is provided on the partition plate 8. The hole structure or groove structure forms the flow holes 81. The flow holes 81 enable the external ambient gas to enter the gap 3 between the fan body 1 and the flow deflector 2.

[0153] Thus, the fan body 1 and the flow deflector 2 can be constructed into an integral module.

[0154] Based on the inspiration of the ideal embodiments of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A flow-compensated drainage fan, characterized in that: It includes a fan body (1) and a flow deflector (2), and the flow deflector (2) is arranged on one side or both sides of the fan body (1); On the surface of the side of the fan body (1) close to the flow deflector (2), at least two jet holes (11) are provided corresponding to the flow deflector (2), and the air flow generated by the fan body (1) is ejected through the jet holes (11); The flow deflector (2) includes a top wall (21), side walls (22) and a bottom wall (23). One end of the side wall (22) close to the fan body (1) is connected to the top wall (21), and one end of the side wall (22) far from the fan body (1) is connected to the bottom wall (23). A gap (3) is left between the surface of the side of the fan body (1) close to the flow deflector (2) and the opposite top wall (21); An open flow guiding cavity (5) for ejecting the air flow in a set direction is enclosed among the top wall (21), the bottom wall (23) and the side walls (22). The open flow guiding cavity (5) extends in the set direction and penetrates through the side wall (22), and an outlet (6) is formed at the penetration of the side wall (22). At least two of the jet holes (11) are arranged at intervals in the set direction; Drainage channels (4) corresponding to the jet holes (11) one by one and penetrating through the top wall (21) are respectively arranged in the areas of the top wall (21) opposite to the jet holes (11), and the drainage channels (4) are all communicated with the open flow guiding cavity (5); The flow through area of the drainage channel (4) is larger than the flow through area of the corresponding jet hole (11), and the flow through area of the open flow guiding cavity (5) shows a gradually increasing trend along the set direction; The air flow ejected from the jet holes (11) of the fan body (1) to the drainage channels (4) is ejected in the set direction under the guidance of the open flow guiding cavity (5).

2. The flow compensation induced draft fan according to claim 1, characterized in that: The flow through areas of the drainage channels (4) corresponding to the respective jet holes (11) increase successively along the set direction.

3. The flow compensation induced draft fan according to claim 1, characterized in that: The top wall (21) has first drainage areas (21-1) corresponding to the drainage channels (4) one by one, and the first drainage areas (21-1) are the areas on the top wall (21) around the outer peripheral sides of the corresponding drainage channels (4); The bottom wall (23) has second drainage areas (23-1) corresponding to the first drainage areas (21-1) one by one, and the second drainage areas (23-1) are opposite to the corresponding first drainage areas (21-1); At least one first drainage area (21-1) or / and at least one second drainage area (23-1) is penetrated by drainage holes (211) communicated with the open flow guiding cavity (5).

4. The flow compensation induced draft fan according to claim 3, characterized in that: The drainage holes (211) are located between two adjacent drainage channels (4), or / and the drainage holes (211) are located between the drainage channel (4) adjacent to the outlet (6) and the outlet (6).

5. The flow compensation induced draft fan according to claim 4, characterized in that: The drainage holes (211) are all arranged in the first drainage areas (21-1).

6. The flow compensation induced draft fan according to claim 2 or 3, characterized in that: The area within the open drainage cavity (5) between two adjacent drainage channels (4) is the first flow channel (51), and the area within the open drainage cavity (5) between the drainage channel (4) adjacent to the outflow port (6) and the outflow port (6) is the second flow channel (52); the height of the first flow channel (51) on the upstream side in the set direction among two adjacent first flow channels (51) < the height of the first flow channel (51) on the downstream side in the set direction, so that the flow areas of the respective first flow channels (51) gradually increase along the set direction; the height of the first flow channel (51) adjacent to the second flow channel (52) < the height of the second flow channel (52), so that the flow area of the first flow channel (51) adjacent to the second flow channel (52) is smaller than the flow area of the second flow channel (52).

7. The flow compensation induced draft fan according to claim 6, wherein: Along the set direction, the area of the top wall (21) opposite to the open drainage cavity (5) is a stepped plate-like structure with gradually decreasing thickness; the thickness of the area of the top wall (21) corresponding to the position of the first flow channel (51) on the upstream side in the set direction among two adjacent first flow channels (51) > the thickness of the area of the top wall (21) corresponding to the position of the first flow channel (51) on the downstream side in the set direction, and the thickness of the area of the top wall (21) corresponding to the position of the first flow channel (51) adjacent to the second flow channel (52) > the thickness of the area of the top wall (21) corresponding to the position of the second flow channel (52), so that the flow area of the open drainage cavity (5) gradually increases along the set direction.

8. The flow compensation induced draft fan according to claim 2 or 3, characterized in that: Along the set direction, the area of the top wall (21) opposite to the open drainage cavity (5) is a flat plate-like structure; The area within the open drainage cavity (5) between two adjacent drainage channels (4) is the first flow channel (51), and the area within the open drainage cavity (5) between the drainage channel (4) adjacent to the outflow port (6) and the outflow port (6) is the second flow channel (52); The set direction intersects with the longitudinal direction; the width of the first flow channel (51) on the upstream side in the set direction among two adjacent first flow channels (51) in the longitudinal direction < the width of the first flow channel (51) on the downstream side in the set direction in the longitudinal direction, so that the flow areas of the respective first flow channels (51) gradually increase along the set direction; the width of the first flow channel (51) adjacent to the second flow channel (52) in the longitudinal direction < the width of the second flow channel (52) in the longitudinal direction, so that the flow area of the first flow channel (51) adjacent to the second flow channel (52) is smaller than the flow area of the second flow channel (52).

9. The flow compensation induced draft fan according to claim 2 or 3, characterized in that: The upper inner wall surface (21a) of the top wall (21) enclosing the open drainage cavity (5), or / and the lower inner wall surface (23a) of the bottom wall (23) enclosing the open drainage cavity (5) is an inclined surface, so that the flow area of the open drainage cavity (5) gradually increases along the set direction; The upper inner wall surface (21a) gradually approaches the side where the fan body (1) is located along the set direction; The lower inner wall surface (23a) gradually moves away from the side where the fan body (1) is located along the set direction.

10. The flow compensation induced draft fan according to claim 2 or 3, characterized in that: A buffer flow channel (7) with an opening facing the outflow port (6) is also enclosed among the top wall (21), the side wall (22), and the bottom wall (23). The drainage channel (4) of the open drainage cavity (5) that is farthest from the outflow port (6) is the inner end drainage channel. The buffer flow channel (7) is located on the side of the inner end drainage channel that is away from the outflow port (6). The opening of the buffer flow channel (7) communicates with the part of the open drainage cavity (5) that faces the inner end drainage channel.

11. The flow compensation induced draft fan according to claim 1, characterized in that: The flow-through areas of at least two of the jet holes (11) are the same or different.

12. The flow compensation induced draft fan according to claim 1, wherein: The flow-through area of the drainage channel (4) is 1.1 to 10 times the flow-through area of the corresponding jet hole (11).

13. The flow compensation induced draft fan according to claim 1, characterized in that: It further includes a partition plate (8), and the fan body (1) is joined to the drainage device (2) through the partition plate (8); The partition plate (8) is a plurality of partition bodies discretely arranged between the fan body (1) and the top wall (21). The opening between two adjacent partition bodies forms a flow-through hole (81), and the flow-through hole (81) enables external environmental gas to enter the gap (3) between the fan body (1) and the drainage device (2); Or the partition plate (8) is a continuous partition plate (8) in a closed-loop structure arranged between the fan body (1) and the top wall (21). At least one hole structure or groove structure is provided on the partition plate (8), and the hole structure or groove structure forms a flow-through hole (81), and the flow-through hole (81) enables external environmental gas to enter the gap (3) between the fan body (1) and the drainage device (2).

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