Flow compensation drainage fan

Abstract

The invention relates to the technical field of heat dissipation devices, in particular to a flow compensation drainage fan which comprises a fan body and a drainage device, and at least two jet flow holes are formed in the surface of the side, close to the drainage device, of the fan body; the drainage device is provided with an open drainage cavity which is defined by a top wall, a bottom wall and a side wall and enables airflow to be sprayed out in the set direction, the airflow generated by the fan body is sprayed out through the jet flow holes, surrounding air is entrained, and primary drainage is formed. The through-flow areas of the drainage channels are sequentially increased in the set direction, or the drainage holes are formed in the designated positions of the wall face of the drainage device, so that at least one time of secondary drainage can be generated when airflow flows in the open drainage cavity, and then the airflow finally sprayed out of the side wall flow outlet is substantially increased, so that the heat dissipation efficiency is improved.

Description

Technical Field

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

[0002] The intelligent and lightweight development of smart terminal products has greatly increased the heat load of internal electronic devices, and efficient heat dissipation technology in a small 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 believed to generate greater thermal benefits, but this also puts forward new requirements for the structural performance of such heat dissipation devices themselves. The air outlet of the positive-jet fan is located on the side where the fan is located in the thickness direction. 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 fan outlet must be arranged directly in the central area of ​​the heat source, and the heat dissipation area is limited. Furthermore, the heat-carrying gas that completes the heat exchange lacks the power to be guided out of the product. Hot air stagnation or hot air circulation is easily formed between the fan and the heat source, affecting the heat dissipation efficiency.

[0003] The side-spray fan has a side air outlet, and the heat source is arranged in the outflow direction of the fan, which overcomes the above-mentioned problems of the forward-spray fan. However, since the direction of the airflow is inconsistent with the final outflow direction of the airflow, the airflow needs to be deflected at a large angle in the space, which will cause energy loss in the process, resulting in insufficient airflow flow ejected from the side air outlet, and the purpose of efficient heat dissipation cannot be achieved. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to solve the deficiencies of the prior art, a flow-compensated drainage fan is provided to solve the problem that, due to the inconsistency between the airflow direction and the final airflow outflow direction of the side-spraying fan, the airflow needs to undergo a large-angle flow deflection in the space, which will generate energy loss and lead to insufficient airflow flow rate ejected from the side air outlet.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a flow-compensated drainage fan, comprising a fan body and a drainage device, wherein the drainage device is arranged on one side or both sides of the fan body;

[0006] The fan body has at least two jet holes on one side surface close to the flow guider corresponding to the flow guider, and the airflow generated by the fan body is ejected through the jet holes;

[0007] The flow diverter comprises a top wall, a side wall and a bottom wall, wherein one end of the side wall close to the fan body is connected to the top wall, and one end of the side wall away from the fan body is connected to the bottom wall, and a gap is left between the surface of the fan body close to the flow diverter and the top wall opposite thereto;

[0008] An open drainage cavity is enclosed between the top wall, the bottom wall and the side wall, which allows the airflow to be ejected in a set direction. The open drainage cavity extends in the set direction and penetrates the side wall, and forms an outlet at the penetration of the side wall. At least two jet holes are arranged at intervals along the set direction. The areas of the top wall opposite to the jet holes are respectively provided with drainage channels corresponding to the jet holes one by one and penetrating the top wall, and the drainage channels are all connected to the open drainage cavity.

[0009] The flow area of ​​the drainage channel is larger than the flow area of ​​the corresponding jet hole, and the flow area of ​​the open drainage cavity tends to gradually increase along the set direction;

[0010] The airflow sprayed from the jet hole of the fan body to the drainage channel is sprayed toward a set direction under the guidance of the open drainage cavity.

[0011] The first solution that can further increase the ejection flow rate is as follows: the flow area of ​​each of the drainage channels opposite to each of the jet holes increases sequentially along the set direction.

[0012] The second solution that can further increase the ejection flow rate: the top wall has a first drainage area corresponding to the drainage channels one by one, and the first drainage area is an 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 is directly opposite to the corresponding first drainage area;

[0014] At least one first drainage area and / or at least one second drainage area is penetrated by a drainage hole communicating with the open drainage cavity.

[0015] Further, the drainage hole is located between two adjacent drainage channels, or / and the drainage hole is located between a drainage channel adjacent to the outlet and the outlet.

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

[0017] A first solution for forming an open drainage cavity: the area between two adjacent drainage channels in the open drainage cavity is a first flow channel, and the area between the drainage channel adjacent to the outlet and the outlet in the open drainage cavity is a second flow channel;

[0018] The height of the first flow passage located on the upstream side of the set direction among two adjacent first flow passages is less than the height of the first flow passage located on the downstream side of the set direction, so that the flow area of ​​each of the first flow passages increases sequentially along the set direction;

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

[0020] Furthermore, along the set direction, the area of ​​the top wall opposite to the open drainage cavity is a plate-like structure with a thickness that gradually becomes thinner in a stepped manner;

[0021] The thickness of the top wall region corresponding to the position of the first through flow channel located on the upstream side of the set direction among the two adjacent first through flow channels is less than the thickness of the top wall region corresponding to the position of the first through flow channel located on the downstream side of the set direction;

[0022] The thickness of the top wall region corresponding to the location of the first through flow channel adjacent to the second through flow channel is less than the thickness of the top wall region corresponding to the location of the second through flow channel.

[0023] A second solution for forming an open drainage cavity: along the set direction, the area of ​​the top wall opposite to the open drainage cavity is a planar 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 passage located on the upstream side in the set direction in the longitudinal direction of two adjacent first flow passages is less than the width of the first flow passage located on the downstream side in the set direction in the longitudinal direction, so that the flow areas of the first flow passages increase in sequence along the set direction;

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

[0028] A third solution for forming an open drainage cavity: an upper inner wall surface of a top wall enclosing the open drainage cavity, or / and a lower inner wall surface of a bottom wall enclosing the open drainage cavity are inclined surfaces, so that a flow area of ​​the open drainage cavity gradually increases along the set direction;

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

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

[0031] Furthermore, the top wall, side walls and bottom wall also enclose a buffer flow channel opening toward the outlet, the open drainage cavity is located in the drainage channel farthest from the outlet, which is the inner drainage channel, and the buffer flow channel is located on the side of the inner drainage channel farthest from the outlet, and the opening of the buffer flow channel is connected to the part where the open drainage cavity is opposite to the inner drainage channel.

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

[0033] Furthermore, the flow area of ​​the drainage channel is 1.1 to 10 times the flow area of ​​the corresponding jet hole.

[0034] Furthermore, it also includes a partition plate, and the fan body is connected to the flow guider through the partition plate;

[0035] The partition plate is a plurality of partitions discretely arranged between the fan body and the top wall, and the opening between two adjacent partitions constitutes a through hole, and the through hole allows external ambient gas to enter the gap between the fan body and the flow guider;

[0036] Alternatively, the partition plate is a continuous partition plate in a closed-loop structure arranged between the fan body and the top wall, and at least one hole structure or groove structure is arranged on the partition plate, and the hole structure or groove structure constitutes a flow hole, and the flow hole allows external environmental gas to enter the gap between the fan body and the deflector.

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

[0038] 1) In the present invention, the airflow generated by the fan body is ejected through the jet hole, and the gas in the outer peripheral area of ​​the gap between the fan body and the guider opposite to the jet hole is sucked to form a primary drainage, so that the flow direction of the fluid is deflected after entering the open drainage cavity. Although energy loss occurs, the airflow 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 outlet on the side wall;

[0039] 2) In the present invention, since the flow area of ​​the open drainage cavity tends to gradually increase along the set direction, the airflow slows down and restores the pressure when flowing through the open drainage cavity, which can increase the flow rate;

[0040] 3) In the present invention, since the flow areas of the drainage channels arranged along the set direction increase successively, for the two adjacent drainage channels, the airflow flowing into the open drainage cavity from the upstream drainage channel flows through the open drainage cavity. Since the flow area of ​​the downstream drainage channel is relatively large, the airflow in the open drainage cavity will further pull the airflow flowing in the downstream drainage channel when flowing through the downstream drainage channel, thereby generating a stronger entrainment effect between the downstream drainage channel and the jet hole arranged opposite thereto, forming a secondary drainage, thereby substantially increasing the airflow flow rate flowing from the downstream drainage channel into the open drainage cavity, and finally further increasing the airflow 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 the drainage channel one by one, the first drainage area is an 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 directly opposite, at least one first drainage area or / and at least one second drainage area is penetrated by a drainage hole connected to 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 and the outlet adjacent to the outlet, so that when the airflow flows through the open drainage cavity, it will also produce a pulling effect on the gas in the drainage hole, thereby generating at least one secondary drainage, thereby substantially increasing the amount of air 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 apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0044] Figure 1 A schematic diagram of a flow-compensated drainage fan;

[0045] Figure 2 is a cross-sectional schematic diagram of the flow diverter in Example 1;

[0046] Figure 3 is a cross-sectional schematic diagram of the flow diverter in Example 2;

[0047] Figure 4 is a cross-sectional schematic diagram of the flow diverter in Example 3;

[0048] Figure 5 It is a schematic diagram showing that the widths of the first flow channel I, the first flow channel II and the second flow channel in Example 3 increase in sequence;

[0049] Figure 6is a cross-sectional schematic diagram of the flow diverter in Example 4;

[0050] Figure 7 A schematic diagram of a flow compensation fan equipped with a partition plate in Example 6;

[0051] Figure 8 A schematic diagram of a flow-compensated drainage fan of Example 7;

[0052] Fig. 9 is a cross-sectional schematic diagram of the flow diverter in Example 7;

[0053] Fig.10 is a cross-sectional schematic diagram of the flow guider in Example 8;

[0054] Fig.11 is a cross-sectional schematic diagram of the flow guider in Example 9;

[0055] Fig.12 It is a schematic diagram showing that the widths of the first flow channel I, the first flow channel II and the second flow channel increase in sequence in Example 9;

[0056] Fig.13 is a cross-sectional schematic diagram of the flow guider in Example 10;

[0057] Fig.14 A schematic diagram of a flow compensation fan equipped with a partition plate in Example 12;

[0058] Fig.15 is a schematic diagram of the distribution of the first drainage area on the top wall;

[0059] Fig.16 It is a schematic diagram of the distribution of the second drainage area on the top wall.

[0060] In the figure: 1, fan body, 11, jet hole;

[0061] 2. Drainage device; 21. top wall, 21a. upper inner wall surface, 21-1. first drainage area, 211. drainage hole, 22. side wall, 23. bottom wall, 23a. lower inner wall surface, 23-1. second drainage area;

[0062] 3. Clearance;

[0063] 4. Drainage channel, 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. Through hole. DETAILED DESCRIPTION

[0068] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0069] Example 1

[0070] like Figure 1 As shown, a flow-compensated drainage fan can be used as a heat dissipation device for electronic components inside smart terminal products, including a fan body 1 and a drain 2 arranged on one side or both sides of the fan body 1 with a gap 3 between them; the drain 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 drainage fan of this embodiment is toward the heat source, so as to achieve heat dissipation of the heat source by using the drainage fan of this embodiment.

[0071] At least two jet holes 11 are arranged along a set direction on one side of the fan body 1 close to the deflector 2. The shape of the jet hole 11 can be circular, square, rectangular, elliptical or other shapes, and there is no limitation on this. 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 hole 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 on the present invention.

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

[0073] An open drainage cavity 5 is enclosed between the top wall 21, the bottom wall 23 and the side wall 22, and the open drainage cavity 5 extends in the set direction and penetrates the side wall 22, and forms an outlet 6 at the penetration of the side wall 22, and the open drainage cavity 5 is connected with the outlet 6, and at least two jet holes 11 are arranged at intervals along the set direction; the area of ​​the top wall 21 opposite to the jet hole 11 is respectively provided with drainage channels 4 corresponding to the jet hole 11 one by one and penetrating the top wall 21, and the drainage channels 4 are all connected with the open drainage cavity 5;

[0074] The airflow sprayed from the jet hole 11 of the fan body 1 toward the drainage channel 4 is sprayed in a set direction under the guidance of the open drainage cavity 5. It is not difficult to understand that the jet hole 11 arranged on the fan body 1 is opposite to the top wall 21 of the drain device 2, and the outlet 6 is arranged on the side wall 22 surrounding the open drainage cavity 5. After the airflow is sprayed out from the jet hole 11 of the fan body 1, the flow direction is deflected under the action of the drain device 2, so that the drainage fan of this embodiment has the function of lateral jet.

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

[0076] The flow areas of the drainage channels 4 corresponding to the jet holes 11 increase in sequence along the set direction;

[0077] The flow area of ​​the open drainage cavity 5 tends to increase gradually along the set direction. Figure 1 shown.

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

[0079] The height of the first flow channel 51 located on the upstream side of the set direction among two adjacent first flow channels 51 is less than the height of the first flow channel 51 located on the downstream side of the set direction, so that the flow area of ​​each first flow channel 51 increases successively along the set direction, and the airflow 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 is less than 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.

[0080] Specifically, 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 a gradually thinning overall thickness; the thickness of the top wall 21 area corresponding to the position of the first flow channel 51 located on the upstream side of the set direction of the two adjacent first flow channels 51 is greater than the thickness of the top wall 21 area corresponding to the position of the first flow channel 51 located on the downstream side of the set direction; the thickness of the top wall 21 area corresponding to the position of the first flow channel 51 adjacent to the second flow channel 52 is greater than the thickness of the top wall 21 area corresponding to the position of the second flow channel 52, so that the flow area of ​​the open drainage cavity 5 tends to gradually increase 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 portion between two adjacent drainage channels 4 on the top wall 21 and the thickness of the portion between the drainage channel 4 adjacent to the outlet 6 on the top wall 21 and the outlet 6, so that the flow areas of each first flow channel 51 increase sequentially 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, Figure 2 As shown, along the set direction, the drainage channels 4 penetrating the top wall 21 are drainage channels I 41, drainage channels II 42 and drainage channels III 43 respectively, and the area between the drainage channels I 41 and the drainage channels II 42 and the bottom wall 23 and the side wall 22 form a first flow channel 51 facing the set direction as the first flow channel I 511, and the part between the drainage channels II 42 and the drainage channels III 43 and the bottom wall 23 and the side wall 22 form a first flow channel 51 facing the set direction as the first flow channel II 512, wherein the top wall opposite to the open drainage cavity 5 The thickness of the area between the drainage channel I 41 and the drainage channel II 42 on the top wall 21 is H1, the thickness of the area 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 area between the drainage channel 4 adjacent to the outlet 6 on the top wall 21 opposite to the open drainage cavity 5 and the outlet 6 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 will increase successively along the set direction.

[0083] Thus, by arranging the deflector 2 on one or both sides of the fan body 1 with a gap 3 between them, at least two jet holes 11 are arranged on one side of the fan body 1 close to the deflector 2 along the set direction, and a drainage channel 4 penetrating the top wall 21 is arranged in the area opposite to the jet holes 11 and surrounding the top wall 21 of the deflector 2. The airflow generated by the fan body 1 is ejected through the jet holes 11, and the gas in the outer peripheral direction of the area opposite to the jet holes 11 in the gap 3 between the fan body 1 and the deflector 2 is sucked to form a primary drainage, so that the flow direction of the fluid is deflected after entering the open drainage cavity 5. Although energy loss occurs, the airflow has high inertia after being rectified by the drainage channel 4, and can still maintain a certain momentum to flow through the open drainage cavity 5 and finally be ejected from the outlet 6 on the side wall 22. In this process:

[0084] On the one hand, since the flow area of ​​the open drainage cavity 5 tends to gradually increase along the set direction, the airflow slows down and restores the pressure while flowing through the open drainage cavity 5, which can increase the flow rate;

[0085] On the other hand, since the flow areas of each drainage channel 4 arranged along the set direction increase successively, for two adjacent drainage channels 4: the airflow flowing from the drainage channel 4 relatively far away from the outlet 6 into the open drainage cavity 5 flows through the open drainage cavity 5, and when the airflow in the open drainage cavity 5 flows through the drainage channel 4 relatively close to the outlet 6, since the flow area of ​​the drainage channel 4 relatively close to the outlet 6 is relatively large, the airflow flowing in the drainage channel 4 relatively close to the outlet 6 will be further pulled, thereby generating a stronger suction effect between the drainage channel 4 relatively close to the outlet 6 and the jet hole 11 arranged opposite to it, forming secondary drainage, thereby substantially increasing the airflow flow rate flowing from the drainage channel 4 relatively close to the outlet 6 into the open drainage cavity 5, and finally further increasing the airflow flow rate ejected from the outlet 6, so as to improve the heat dissipation efficiency.

[0086] The fan body 1 in the present embodiment can adopt any one of the fans with at least two air outlets in the prior art, and in particular, can adopt any one of the piezoelectric fans with at least two air outlets in the prior art. The airflow generated by the fan body 1 is ejected from the air outlets, and the air outlets are the jet holes 11 in the present embodiment; for example, the fan body 1 in the present embodiment can be but is not limited to the fluid generating device disclosed in the Chinese patent with publication number CN119084287A, and the hole portion in the patent corresponds to the jet hole 11 in the present embodiment; the fan body 1 in the present embodiment can also adopt the high-order resonance fluid generating device disclosed in the Chinese patent with publication number CN118979867A, and the hole portion in the patent corresponds to the jet hole 11 in the present embodiment.

[0087] Example 2

[0088] The difference between Example 2 and Example 1 is that: the top wall 21, the side wall 22 and the bottom wall 23 also enclose a buffer flow channel 7 with an opening toward the outlet 6, the open drainage cavity 5 is located in the drainage channel 4 farthest from the outlet 6 as the inner drainage channel, the buffer flow channel 7 is located on the side of the inner drainage channel farthest from the outlet 6, and the opening of the buffer flow channel 7 is connected to the part directly opposite to the open drainage cavity 5 and the inner drainage channel; so as to weaken as much as possible the energy attenuation of the airflow in the process of flow deflection caused by the airflow flowing through the drainage channel 4 farthest from the outlet 6 into the open drainage cavity 5, such as Figure 3 shown.

[0089] Example 3

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

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

[0092] The setting direction intersects the longitudinal direction, for example, the setting direction is perpendicular to the longitudinal direction;

[0093] The width of the first flow passage 51 located on the upstream side in the set direction in the longitudinal direction of two adjacent first flow passages 51 is less than the width of the first flow passage 51 located on the downstream side in the set direction in the longitudinal direction, so that the flow areas of the first flow passages 51 increase 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 is smaller than 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 tends to gradually increase along the set direction.

[0096] For example, Figure 4-Figure 5As shown, along the set direction, the drainage channels 4 passing through the top wall 21 are drainage channel I 41, drainage channel II 42 and drainage channel III 43 respectively, the first flow channel 51 facing the set direction formed by the area between drainage channel I 41 and drainage channel II 42 and the bottom wall 23 and the side wall 22 is the first flow channel I 511, and the first flow channel 51 facing the set direction formed by the part between drainage channel II 42 and drainage channel III 43 and the bottom wall 23 and the side wall 22 is the first flow channel II 512; wherein, 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 area of ​​the first flow channel I 511, the flow area of ​​the first flow channel II 512 and the flow area of ​​the second flow channel 52 will increase successively along the set direction.

[0097] Example 4

[0098] The difference between this embodiment and embodiment 3 is that: the top wall 21, the side wall 22 and the bottom wall 23 also enclose a buffer flow channel 7 with an opening toward the outlet 6, the open drainage cavity 5 is located in the drainage channel 4 farthest from the outlet 6 as the inner drainage channel, the buffer flow channel 7 is located on the side of the inner drainage channel farthest from the outlet 6, and the opening of the buffer flow channel 7 is connected to the part directly opposite to the open drainage cavity 5 and the inner drainage channel; so as to weaken as much as possible the energy attenuation of the airflow in the process of flow deflection caused by the airflow flowing into the open drainage cavity 5 through the drainage channel 4 farthest from the outlet 6, such as Figure 6 shown.

[0099] Example 5

[0100] The difference between this embodiment and any one of embodiments 1-4 is that: Figure 1 As 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 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 gradually increases along the set direction.

[0102] Example 6

[0103] The difference between this embodiment and any one of embodiments 1-5 is that: Figure 7 As shown, it also includes a partition plate 8, through which the fan body 1 is connected to the flow guider 2, and the partition plate 8 can be specifically fixedly connected to the outer shell of the fan body 1;

[0104] The partition plate 8 is a plurality of partitions discretely arranged between the fan body 1 and the top wall 21. The plurality of partitions may be spaced apart along the circumference of the fan body 1. The opening between two adjacent partitions constitutes a through hole 81. The through hole 81 allows the external environment gas to enter the gap 3 between the fan body 1 and the flow guider 2.

[0105] Alternatively, 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 may be in a circular ring shape, and at least one hole structure or groove structure is arranged on the partition plate 8. The hole structure or groove structure constitutes a flow hole 81, and the flow hole 81 allows external ambient gas to enter the gap 3 between the fan body 1 and the deflector 2.

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

[0107] It should also be noted that the arrangement of the partition plate 8 does not hinder the airflow generation process of the fan body 1 , and the arrangement of the partition plate 8 allows the jet holes 11 to be exposed on the side of the partition plate 8 facing the deflector 2 .

[0108] Example 7

[0109] like Figure 8 As shown, a flow-compensated drainage fan can be used as a heat dissipation device for electronic components inside smart terminal products, including a fan body 1 and a drain 2 arranged on one side or both sides of the fan body 1 with a gap 3 between them; the drain 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 drainage fan of this embodiment is toward the heat source, so as to achieve heat dissipation of the heat source by using the drainage fan of this embodiment.

[0110] At least two jet holes 11 are arranged along a set direction on one side of the fan body 1 close to the deflector 2. The shape of the jet hole 11 can be circular, square, rectangular, elliptical or other shapes, and there is no limitation on this. 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 hole 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 on the present invention.

[0111] The airflow generated by the fan body 1 is ejected through the jet hole 11. The flow guider 2 includes a top wall 21, a side wall 22 and a bottom wall 23. The end of the side wall 22 close to the jet hole 11 is connected to the top wall 21, so that the top wall 21 of the flow guider 2 is arranged close to the fan body 1, and the end of the side wall 22 away from the jet hole 11 is connected to the bottom wall 23. A gap 3 is left between the surface of the fan body 1 close to the flow guider 2 and the top wall 21 opposite thereto;

[0112] An open drainage cavity 5 is enclosed between the top wall 21, the bottom wall 23 and the side wall 22, and the open drainage cavity 5 extends in the set direction and penetrates the side wall 22, and forms an outlet 6 at the penetration of the side wall 22, and the open drainage cavity 5 is connected with the outlet 6, and at least two jet holes 11 are arranged at intervals along the set direction; the area of ​​the top wall 21 opposite to the jet hole 11 is respectively provided with drainage channels 4 corresponding to the jet hole 11 one by one and penetrating the top wall 21, and the drainage channels 4 are all connected with the open drainage cavity 5;

[0113] The airflow sprayed from the jet hole 11 of the fan body 1 toward the drainage channel 4 is sprayed in a set direction under the guidance of the open drainage cavity 5. It is not difficult to understand that the jet hole 11 arranged on the fan body 1 is opposite to the top wall 21 of the drain device 2, and the outlet 6 is arranged on the side wall 22 surrounding the open drainage cavity 5. After the airflow is sprayed out from the jet hole 11 of the fan body 1, the flow direction is deflected under the action of the drain device 2, so that the drainage fan of this embodiment has the function of lateral jet.

[0114] Similarly, the cross-sectional shape of the drainage channel 4 may be circular, square, rectangular, elliptical or other shapes, which is not limited here. In this embodiment, the cross-sectional shape of the drainage channel 4 is circular for illustration, but this does not constitute a limitation to the present invention. The flow area of ​​the drainage channel 4 is greater than the flow area of ​​the corresponding jet hole 11. Preferably, the flow area of ​​the drainage channel 4 is 1.1 to 10 times the flow area of ​​the corresponding jet hole 11, so that the airflow ejected from the jet hole 11 can be received by the drainage channel 4, avoiding flow loss caused by wall reflection.

[0115] The top wall 21 has a first drainage area 21 - 1 corresponding to the drainage channel 4 one by one. The first drainage area 21 - 1 is an area on the top wall 21 around the outer peripheral side of the corresponding drainage channel 4;

[0116] The bottom wall 23 has a second drainage area 23-1 corresponding to the first drainage area 21-1, and the second drainage area 23-1 is directly opposite to the corresponding first drainage area 21-1; it is worth noting that the first drainage areas 21-1 of two adjacent drainage channels 4 can cross or be separated from each other, such as Fig.15 As shown;

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

[0118] Preferably, the drainage hole 211 is located between two adjacent drainage channels 4, or / and the drainage hole 211 is located between the drainage channel 4 adjacent to the outlet 6 and the outlet 6; it is worth noting that the drainage hole 211 located between two adjacent drainage channels 4 can be located in the first drainage area 21-1 or in the second drainage area 23-1.

[0119] That is, there are three options:

[0120] Solution 1: The top wall 21 or the bottom wall 23 has a drainage hole 211 in the portion between at least two adjacent drainage channels 4, or even the top wall 21 or the bottom wall 23 has a drainage hole 211 in the portion between all two adjacent drainage channels 4;

[0121] Solution 2: A drainage hole 211 is penetrated through the top wall 21 or the bottom wall 23 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 has a drainage hole 211 in a portion between at least two adjacent drainage channels 4; and the top wall 21 or the bottom wall 23 has a drainage hole 211 in a portion between the drainage channel 4 adjacent to the outlet 6 and the outlet 6;

[0123] Further preferably, the drainage hole 211 between two adjacent drainage channels 4 is located in the first drainage area 21 - 1 .

[0124] The flow area of ​​the open drainage cavity 5 tends to increase gradually along the set direction. Figure 8 shown.

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

[0126] The height of the first flow channel 51 located on the upstream side of the set direction among the two adjacent first flow channels 51 is less than the height of the first flow channel 51 on the downstream side of the set direction, so that the flow area of ​​each first flow channel 51 increases successively along the set direction, and the airflow 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 is less than 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 area of ​​the top wall 21 opposite to the open drainage cavity 5 is a stepped plate-like structure with a gradually thinning overall thickness; the thickness of the top wall 21 area corresponding to the position of the first flow channel 51 located on the upstream side of the set direction of the two adjacent first flow channels 51 is greater than the thickness of the top wall 21 area corresponding to the position of the first flow channel 51 located on the downstream side of the set direction; the thickness of the top wall 21 area corresponding to the position of the first flow channel 51 adjacent to the second flow channel 52 is greater than the thickness of the top wall 21 area corresponding to the position of the second flow channel 52, so that the flow area of ​​the open drainage cavity 5 tends to gradually increase 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 portion between two adjacent drainage channels 4 on the top wall 21 and the thickness of the portion between the drainage channel 4 adjacent to the outlet 6 on the top wall 21 and the outlet 6, so that the flow areas of each first flow channel 51 increase sequentially 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, Fig. 9As shown, along the set direction, the drainage channels 4 penetrating the top wall 21 are drainage channels I 41, drainage channels II 42 and drainage channels III 43 respectively, and the area between the drainage channels I 41 and the drainage channels II 42 and the bottom wall 23 and the side wall 22 form a first flow channel 51 facing the set direction as the first flow channel I 511, and the part between the drainage channels II 42 and the drainage channels III 43 and the bottom wall 23 and the side wall 22 form a first flow channel 51 facing the set direction as the first flow channel II 512, wherein the top wall opposite to the open drainage cavity 5 The thickness of the area between the drainage channel I 41 and the drainage channel II 42 on the top wall 21 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 adjacent to the outlet 6 on the top wall 21 opposite to the open drainage cavity 5 and the outlet 6 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 will increase successively along the set direction.

[0130] A drainage hole 211 is penetrated in a region of the top wall 21 opposite to the at least one first flow channel 51 , and / or a drainage hole 211 is penetrated in a region of the top wall 21 opposite to the second flow channel 52 .

[0131] Thus, by arranging the deflector 2 on one or both sides of the fan body 1 with a gap 3 between them, at least two jet holes 11 are arranged on one side of the fan body 1 close to the deflector 2 along the set direction, and a drainage channel 4 penetrating the top wall 21 is arranged in the area opposite to the jet holes 11 and surrounding the top wall 21 of the deflector 2. The airflow generated by the fan body 1 is ejected through the jet holes 11, and the gas in the outer peripheral direction of the area opposite to the jet holes 11 in the gap 3 between the fan body 1 and the deflector 2 is sucked to form a primary drainage, so that after the fluid enters the open drainage cavity 5, the flow direction is deflected. Although energy loss occurs, the airflow has high inertia after being rectified by the drainage channel 4, and can still maintain a certain momentum 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 chamber 5 tends to gradually increase along the set direction, the airflow slows down and restores the pressure when flowing through the open drainage chamber 5, thereby increasing the flow rate; on the other hand, since at least one first drainage area 21-1 and / or at least one second drainage area 23-1 is penetrated by a drainage hole 211 connected to the open drainage chamber 5, the airflow will also have a pulling effect on the gas in the drainage hole 211 when flowing through the open drainage chamber 5, thereby generating at least one secondary drainage, thereby substantially increasing the amount of airflow finally ejected from the outlet 6 of the side wall 22, thereby improving the heat dissipation efficiency.

[0133] The fan body 1 in the present embodiment can adopt any one of the fans with at least two air outlets in the prior art, and in particular, can adopt any one of the piezoelectric fans with at least two air outlets in the prior art. The airflow generated by the fan body 1 is ejected from the air outlets, and the air outlets are the jet holes 11 in the present embodiment; for example, the fan body 1 in the present embodiment can be but is not limited to the fluid generating device disclosed in the Chinese patent with publication number CN119084287A, and the hole portion in the patent corresponds to the jet hole 11 in the present embodiment; the fan body 1 in the present embodiment can also adopt the high-order resonance fluid generating device disclosed in the Chinese patent with publication number CN118979867A, and the hole portion in the patent corresponds to the jet hole 11 in the present embodiment.

[0134] Example 8

[0135] The difference between Example 8 and Example 7 is that: the top wall 21, the side wall 22 and the bottom wall 23 also enclose a buffer flow channel 7 with an opening toward the outlet 6, the open drainage cavity 5 is located in the drainage channel 4 farthest from the outlet 6 as the inner drainage channel, the buffer flow channel 7 is located on the side of the inner drainage channel farthest from the outlet 6, and the opening of the buffer flow channel 7 is connected to the part directly opposite to the open drainage cavity 5 and the inner drainage channel; so as to weaken as much as possible the energy attenuation of the airflow in the process of flow deflection caused by the airflow flowing through the drainage channel 4 farthest from the outlet 6 into the open drainage cavity 5, such as Fig.10 shown.

[0136] Example 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 a planar plate-like structure;

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

[0139] The setting direction intersects the longitudinal direction, for example, the setting direction is perpendicular to the longitudinal direction;

[0140] The width of the first flow passage 51 located on the upstream side in the set direction in the longitudinal direction of two adjacent first flow passages 51 is less than the width of the first flow passage 51 located on the downstream side in the set direction in the longitudinal direction, so that the flow areas of the first flow passages 51 increase in sequence along the set direction;

[0141] The width of the first flow channel 51 adjacent to the second flow channel 52 in the longitudinal direction is less than 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, Figure 11-Figure 12 As shown, along the set direction, the drainage channels 4 passing through the top wall 21 are drainage channel I 41, drainage channel II 42 and drainage channel III 43 respectively, the first flow channel 51 facing the set direction formed by the area between drainage channel I 41 and drainage channel II 42 and the bottom wall 23 and the side wall 22 is the first flow channel I 511, and the first flow channel 51 facing the set direction formed by the part between drainage channel II 42 and drainage channel III 43 and the bottom wall 23 and the side wall 22 is the first flow channel II 512; wherein, 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 area of ​​the first flow channel I 511, the flow area of ​​the first flow channel II 512 and the flow area of ​​the second flow channel 52 will increase successively along the set direction.

[0143] Example 10

[0144] The difference between this embodiment and embodiment 9 is that: the top wall 21, the side wall 22 and the bottom wall 23 also enclose a buffer flow channel 7 with an opening toward the outlet 6, the open drainage cavity 5 is located in the drainage channel 4 farthest from the outlet 6 as the inner drainage channel, the buffer flow channel 7 is located on the side of the inner drainage channel farthest from the outlet 6, and the opening of the buffer flow channel 7 is connected to the part directly opposite to the open drainage cavity 5 and the inner drainage channel; so as to weaken as much as possible the energy attenuation of the airflow in the process of flow deflection caused by the airflow flowing into the open drainage cavity 5 through the drainage channel 4 farthest from the outlet 6, such as Fig.13 As shown;

[0145] Embodiment 11

[0146] The difference between this embodiment and any one of Embodiments 7-10 is that: Figure 8 As 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 are inclined surfaces;

[0147] The upper inner wall surface 21a gradually moves toward the side where the fan body 1 is located along a 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 that the flow area of ​​the open drainage cavity 5 gradually increases along the set direction.

[0149] Example 12

[0150] The difference between this embodiment and any one of the embodiments 7-11 is that: Fig.14As shown, it also includes a partition plate 8, through which the fan body 1 is connected to the flow guider 2, and the partition plate 8 can be specifically fixedly connected to the outer shell of the fan body 1;

[0151] The partition plate 8 is a plurality of partitions discretely arranged between the fan body 1 and the top wall 21. The plurality of partitions may be spaced apart along the circumference of the fan body 1. The opening between two adjacent partitions constitutes a through hole 81. The through hole 81 allows the external environment gas to enter the gap 3 between the fan body 1 and the flow guider 2.

[0152] Alternatively, 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 may be in a circular ring shape, and at least one hole structure or groove structure is arranged on the partition plate 8. The hole structure or groove structure constitutes a flow hole 81, and the flow hole 81 allows external ambient gas to enter the gap 3 between the fan body 1 and the deflector 2.

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

[0154] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of 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 comprises a fan body (1) and a flow director (2), wherein the flow director (2) is arranged on one side or both sides of the fan body (1); A surface of one side of the fan body (1) close to the flow guider (2) is provided with at least two jet holes (11) corresponding to the flow guider (2), and the airflow generated by the fan body (1) is ejected through the jet holes (11); The flow guider (2) comprises a top wall (21), a side wall (22) and a bottom wall (23); an end of the side wall (22) close to the fan body (1) is connected to the top wall (21); an end of the side wall (22) away from the fan body (1) is connected to the bottom wall (23); a gap (3) is left between the surface of the fan body (1) close to the flow guider (2) and the top wall (21) opposite thereto; An open drainage cavity (5) is enclosed between the top wall (21), the bottom wall (23) and the side wall (22) so that the airflow is ejected in a set direction. The open drainage cavity (5) extends in the set direction and penetrates the side wall (22), and forms an outlet (6) at the penetration point of the side wall (22). At least two of the jet holes (11) are arranged at intervals along the set direction. The regions of the top wall (21) opposite to the jet holes (11) are respectively provided with drainage channels (4) corresponding to the jet holes (11) one by one and penetrating the top wall (21), and the drainage channels (4) are all connected to the open drainage cavity (5). The flow area of ​​the drainage channel (4) is greater than the flow area of ​​the corresponding jet hole (11), and the flow area of ​​the open drainage cavity (5) tends to gradually increase along the set direction; The airflow sprayed from the jet hole (11) of the fan body (1) toward the drainage channel (4) is sprayed toward a set direction under the guidance of the open drainage cavity (5).

2. The flow-compensated drainage fan according to claim 1, characterized in that: The flow areas of the respective drainage channels (4) opposite to the respective jet holes (11) increase sequentially along the set direction.

3. The flow-compensated drainage fan according to claim 1, characterized in that: The top wall (21) has first drainage areas (21-1) corresponding one to one with the drainage channels (4), and the first drainage areas (21-1) are areas on the top wall (21) surrounding the outer periphery of the corresponding drainage channels (4); The bottom wall (23) has a second drainage area (23-1) corresponding to the first drainage area (21-1) one by one, and the second drainage area (23-1) and the corresponding first drainage area (21-1) are directly opposite; At least one first drainage area (21-1) and / or at least one second drainage area (23-1) is penetrated by a drainage hole (211) that is in communication with the open drainage cavity (5).

4. The flow-compensated drainage fan according to claim 3, characterized in that: The drainage hole (211) is located between two adjacent drainage channels (4), or / and the drainage hole (211) is located between a drainage channel (4) adjacent to the outlet (6) and the outlet (6).

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

6. The flow-compensated drainage fan according to claim 2 or 3, characterized in that: The area between two adjacent drainage channels (4) in the open drainage cavity (5) is a first flow channel (51), and the area between the drainage channel (4) adjacent to the flow outlet (6) and the flow outlet (6) in the open drainage cavity (5) is a second flow channel (52); the height of the first flow channel (51) located on the upstream side in the set direction of the two adjacent first flow channels (51) is less than the height of the first flow channel (51) located on the downstream side in the set direction, so that the flow area of ​​each of the first flow channels (51) increases sequentially along the set direction; The height of the first flow channel (51) adjacent to the second flow channel (52) is less than 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-compensated drainage fan according to claim 6, characterized in that: 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 a thickness that gradually becomes thinner; The thickness of the top wall (21) region corresponding to the position of the first flow channel (51) located on the upstream side of the set direction among the two adjacent first flow channels (51) is greater than the thickness of the top wall (21) region corresponding to the position of the first flow channel (51) located on the downstream side of the set direction, and the thickness of the top wall (21) region corresponding to the position of the first flow channel (51) adjacent to the second flow channel (52) is greater than the thickness of the top wall (21) region corresponding to the position of the second flow channel (52), so that the flow area of ​​the open drainage cavity (5) tends to gradually increase along the set direction.

8. The flow-compensated drainage 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 planar plate-like structure; The area in the open drainage cavity (5) located between two adjacent drainage channels (4) is a first flow channel (51), and the area in the open drainage cavity (5) located between the drainage channel (4) adjacent to the flow outlet (6) and the flow outlet (6) is a second flow channel (52); The set direction intersects with the longitudinal direction; The width of the first flow passage (51) located on the upstream side in the set direction in the two adjacent first flow passages (51) in the longitudinal direction is less than the width of the first flow passage (51) located on the downstream side in the set direction in the longitudinal direction, so that the flow areas of the first flow passages (51) increase in sequence along the set direction; The width of the first flow channel (51) adjacent to the second flow channel (52) in the longitudinal direction is smaller than 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-compensated drainage 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) are inclined surfaces, so that the flow area of ​​the open drainage cavity (5) tends to gradually increase along the set direction; The upper inner wall surface (21a) gradually moves toward the side where the fan body (1) is located along a set direction; The lower inner wall surface (23a) gradually moves away from the side where the fan body (1) is located along a set direction.

10. The flow-compensated drainage fan according to claim 2 or 3, characterized in that: The top wall (21), the side wall (22) and the bottom wall (23) also enclose a buffer flow channel (7) whose opening faces the outlet (6); the drainage channel (4) located at the open drainage cavity (5) farthest from the outlet (6) is the inner drainage channel; the buffer flow channel (7) is located on the side of the inner drainage channel farthest from the outlet (6); the opening of the buffer flow channel (7) is connected to the portion of the open drainage cavity (5) directly facing the inner drainage channel.

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

12. The flow-compensated drainage fan according to claim 1, characterized in that: The flow area of ​​the drainage channel (4) is 1.1 to 10 times the flow area of ​​the corresponding jet hole (11).

13. The flow-compensated drainage fan according to claim 1, characterized in that: It also includes a partition plate (8), and the fan body (1) is connected to the flow guider (2) through the partition plate (8); The partition plate (8) is a plurality of partitions discretely arranged between the fan body (1) and the top wall (21), and the opening between two adjacent partitions constitutes a through-hole (81), and the through-hole (81) allows external ambient gas to enter the gap (3) between the fan body (1) and the flow guider (2); Alternatively, 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), and the partition plate (8) is provided with at least one hole structure or groove structure, wherein the hole structure or groove structure constitutes a flow hole (81), and the flow hole (81) allows external ambient gas to enter the gap (3) between the fan body (1) and the flow guider (2).

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