Air induction unit

Abstract

The utility model discloses an air induction unit. The air induction unit comprises a device body, an air gathering cover and an air outlet cover. A first vent groove with an upward notch is formed in the upper side surface of the device main body, a second vent groove with a downward notch is formed in the lower side surface of the device main body, and a connecting port is formed between the first vent groove and the second vent groove in the device main body, so that the first vent groove is communicated with the second vent groove; according to the utility model, not only can the operation of constant suction air volume be realized, but also the uniformity of exhausted air can be better, the phenomenon that the air is exhausted in a certain area in a concentrated manner can be avoided, and the two functions can be coordinated and matched, so that the air flow pressure in the whole device main body can be dynamically balanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to air treatment equipment technical field, concretely relates to an air inducer. BACKGROUND

[0002] Air inducer as a kind of efficient, flexible ventilation and air conditioning system components, in recent years, has been widely used in various building environments. For example, on the ceiling of high space building such as exhibition hall, gymnasium, air inducer can be installed near air conditioning outlet. In this way, it can use its induction function, and cold hot air after air conditioning unit processing is effectively sent to the area far from outlet. While traditional air conditioning system often relies on direct air supply or return air system to adjust indoor temperature, humidity and air quality, but these systems often have problems such as high energy consumption, complex maintenance and bacterial growth. The emergence of air inducer, to some extent, solves these problems.

[0003] The working principle of air inducer is based on venturi effect, that is, when high-speed airflow passes through nozzle or slit, a low pressure zone will be formed around it, so as to induce passive entry of surrounding air and mix with it. This passive induction method not only reduces the dependence of the system on active air supply equipment, but also makes air distribution more uniform, improves the comfort of indoor environment.

[0004] Typically, such as the patent literature with the application number CN201420626527.0, discloses a fan coil plus air inducer end device, which includes fan coil, air pipe and inducer, the fan coil includes air inlet and air outlet for leading new air, the air pipe is L-shaped, the air outlet is connected with the transverse end of air pipe, the vertical end of air pipe is connected with inducer, the inducer includes nozzle for spraying new air, two induction air ducts for inducing indoor air, a main air duct for mixing new air and indoor air, two return air inlets and one supply air outlet, the nozzle is connected with air pipe.

[0005] The above patent literature discloses a common air inducer, but it still has certain limitations in use, as follows:

[0006] Firstly, since its working principle is to form a low pressure area around the nozzle or slit when the high-speed airflow passes through it, thereby inducing the surrounding air to passively enter and mix with it, the amount of airflow passing through the nozzle or slit becomes a crucial influencing factor in this operation. Specifically, when the amount of airflow passing through the nozzle or slit increases, the low pressure area formed will be more intense, thereby inducing more surrounding air to enter the mixture; conversely, when the amount of airflow passing through the nozzle or slit decreases, the strength of the low pressure area will weaken, and the amount of induced air will also decrease accordingly. However, this induction method that relies on the amount of airflow passing through the nozzle or slit also brings the problem of unstable induction of air volume. In actual application, due to the influence of various external factors (such as ambient temperature, humidity, wind speed, etc.) on the air supply system, the air supply volume fluctuates. When the air supply volume increases, although more air can be induced to enter, it may also lead to uneven indoor airflow distribution, and even produce excessive airflow noise; when the air supply volume decreases, the amount of induced air is insufficient, which may not meet the indoor ventilation and air exchange requirements, thereby affecting the indoor environmental comfort and air quality.

[0007] Secondly, the current air inducer discharges air through the air supply port, but from the inside of the air inducer, air first passes through the nozzle and then passes through the air supply port. When the amount of airflow passing through the nozzle is large, due to the local low pressure effect of the nozzle and the impact force of the high-speed airflow, air is likely to be mainly concentrated in the area directly opposite the nozzle and rapidly discharged, while the discharge amount of other air supply port areas far from the nozzle is relatively small. This uneven air discharge mode will have a significant impact on indoor air flow and distribution. On the one hand, the area directly opposite the nozzle may produce an uncomfortable blowing sensation due to excessive airflow, and even cause local overcooling or drying; on the other hand, the area far from the nozzle may have poor ventilation and air exchange due to insufficient air flow, resulting in a decrease in indoor air quality.

[0008] Therefore, how to solve the above-mentioned problems existing in the prior art has become a research topic to be solved by the present utility model. Utility model content

[0009] The utility model provides a kind of air inducer, to solve the technical problems proposed in the above background art.

[0010] To achieve the above purpose, the technical scheme adopted by the utility model is: an air inducer, the air inducer includes device main body, wind gathering cover and air outlet cover.

[0011] The first air passage with an upward slot is formed on the upper side surface of the device body, the second air passage with a downward slot is formed on the lower side surface of the device body, and a connecting port is formed between the first air passage and the second air passage in the device body to make the first air passage and the second air passage communicate with each other.

[0012] The wind collecting cover is positioned in the first air passage, the wind collecting cover is funnel-shaped with a wide upper end and a narrow lower end, the upper end is an air inlet, and the lower end is provided with a nozzle port for air outlet; the nozzle port is arranged corresponding to the connecting port, and the diameter of the nozzle port is smaller than that of the connecting port, so as to form a backflow gap therebetween.

[0013] The air outlet cover is positioned and connected at the slot of the second air passage, the air outlet cover includes an air supply inlet located at the upper side and an air supply outlet located at the lower side, and the diameter of the air supply inlet is smaller than that of the air supply outlet; the air supply inlet and the nozzle port are in air path communication.

[0014] A first flow distribution plate is arranged in the air outlet cover, and a plurality of first through holes are uniformly distributed on the first flow distribution plate.

[0015] The air inducer further includes a Venturi valve, the air inlet of the Venturi valve is arranged corresponding to the air outlet side of the device body, the air outlet of the Venturi valve is in communication with the second air passage, and the second air passage is in air path communication with the first air passage through the backflow gap.

[0016] In the above scheme, the content is explained as follows:

[0017] In the above scheme, when the Venturi valve works as a constant air volume component, when the air volume passing through the Venturi valve is small, the air flow speed is relatively low, and the pressure drop generated is also small. At this time, the backward suction force acting on the valve core is small, so the position of the valve core is relatively forward (i.e. close to the inlet, and the valve throat is in the middle region of the Venturi valve). Because the valve core is in the forward position, the effective cross-sectional area of the air flow passing through the air valve is relatively large, so that the air volume is kept at a constant level; when the air volume passing through the Venturi valve is large, the air flow speed increases, and the pressure drop generated also increases. At this time, the backward suction force acting on the valve core increases, and the valve core moves towards the air valve throat. Because the valve core moves backward, the effective cross-sectional area of the air flow passing through the air valve decreases, but the flow speed increases, so that the air volume is kept constant.

[0018] In the above scheme, the Venturi valve can be arranged on both sides of the device body.

[0019] In a further technical scheme, the air flow on the air inlet side of the device body passes through the air inlet, the nozzle port, the air supply inlet and the air supply outlet in sequence to form a first flow path.

[0020] By the above design, the airflow passing through the first flow path generates negative pressure at the upper end of the air collecting cover.

[0021] Further, the device body lower side of the air outlet side of one of the flow, through the Venturi valve, the second air slot backflow gap and the first air slot formed a second flow path.

[0022] By the above design, the device body lower side of the air outlet side of one of the flow (usually, when the device body is installed in the air outlet, the Venturi valve is in the room, that is, the part of the airflow is the indoor airflow) can be backflow and mixed with high-speed airflow.

[0023] Further, the air outlet cover corresponding to the first shunt plate is provided with a second shunt plate, and the first shunt plate and the second shunt plate are spaced apart.

[0024] The second shunt plate is uniformly provided with a plurality of second through holes, and each first through hole and each second through hole is arranged in a staggered manner from the top view.

[0025] In the above scheme, the first shunt plate and the second shunt plate have a set distance, and the first shunt plate and the air inlet also have a certain distance, so that when the high-speed airflow enters the air outlet cover through the air inlet, it first disperses through the distance between the first shunt plate and the air inlet, and then enters the distance between the first shunt plate and the second shunt plate from the through hole on the first shunt plate, realizing secondary dispersion, so that the air exhaust is more uniform, and the phenomenon of air exhaust in a certain area is not easy to occur.

[0026] By the above design, the air exhaust is more uniform.

[0027] Further, the upper surface of the air outlet cover is a airflow guide surface, the airflow guide surface includes a first guide surface and a second guide surface, and the first guide surface and the second guide surface are symmetrically arranged with the air inlet as a reference.

[0028] From the cross-sectional view, the first guide surface and the second guide surface combine to form a "eight-shaped" with high middle and low sides.

[0029] With the above design, the air sucked into the low pressure area can be separated from the high speed airflow with higher efficiency (i.e. not mixed at the air supply inlet and the two flow dividing plates). In the ideal state during operation, the high speed airflow is completely separated from the sucked air, so that the pressure of the low pressure area is not affected. In the case of the application, the high speed airflow is further separated from the sucked air because the high speed airflow will disperse once it contacts the flow dividing plate, which will directly impact the air path between the Venturi valve and the second air slot (i.e. the bending channel below), reducing the amount of air sucked.

[0030] Further technical solutions, the air outlet cover is provided with a wind guide cover connected with the air supply inlet;

[0031] The hollow cavity in the wind guide cover is wide at the top and narrow at the bottom, and is in communication with the nozzle port and the air supply inlet air path. The hollow cavity serves as a guide for the airflow entering the air supply inlet from the top of the device body;

[0032] The wind guide cover has an airflow guide surface, which cooperates with the airflow guide surface to guide the airflow in the second air slot into the first air slot;

[0033] When the airflow flows through the first flow path and the second flow path, the wind guide cover is configured as a separation part that separates the first flow path and the second flow path.

[0034] Further technical solutions, the airflow guide surface includes a first guide surface and a second guide surface;

[0035] The first guide surface and the second guide surface are vertically symmetrical with respect to the air supply inlet;

[0036] The first guide surface intersects with the opposite end of the first flow guide surface at an acute angle; the second guide surface also intersects with the opposite end of the second flow guide surface at an acute angle.

[0037] With the above design, the air sucked into the low pressure area can be actively separated from the high speed airflow, i.e. further reducing the probability of mixing the air sucked into the low pressure area with the high speed air at the air supply inlet.

[0038] Further technical solutions, the device body is provided with a bending channel connected with the second air slot, and a filter block is positioned and connected in the bending channel.

[0039] By the above design, the air sucked in the low pressure area can pass through the venturi valve and enter the second air passage, and in this process, the venturi valve plays a role of constant air volume.

[0040] Further, the air inlet and the nozzle port are provided with a heater, and the heater is configured to heat the airflow passing through the air inlet and the nozzle port.

[0041] By the above design, the discharged air can be freely selected whether to be heated or not, so as to meet more use requirements, and the hollow isosceles trapezoidal structure of the heater can further reduce the probability of the air sucked in the low pressure area mixed with high-speed air at the connecting port.

[0042] As for the "first", "second", etc. used herein, it is not particularly intended to indicate the order or sequence, nor to limit the present application, but only to distinguish the components or operations described by the same technical terms.

[0043] As for the "connection" or "positioning" used herein, it can mean that two or more components or devices are in direct physical contact with each other or indirectly in physical contact with each other, or can mean that two or more components or devices are in operation or action with each other.

[0044] As for the "contain", "include", "have", etc. used herein, they are all open terms, that is, they mean containing but not limited to.

[0045] As for the words (terms) used herein, except for special notes, they generally have the usual meaning of each word used in this field, in the content of the present application and in the special content. Some words used to describe the present application are discussed below or elsewhere in the specification to provide additional guidance for those skilled in the art on the description of the present application.

[0046] As for the "front", "back", "up", "down", "left", "right", etc. used herein, they are all directional words, which are only used to illustrate the positional relationship between structures in the present application, and are not used to limit the protection scheme and the specific direction in actual implementation.

[0047] The working principle and advantages of the present application are as follows:

[0048] The utility model discloses a Venturi valve and first shunt board cooperate, realize constant suction air volume and the operation of fully dispersed jet flow that nozzle mouth spouts, specific, when the high -speed airflow that nozzle mouth spouts is discharged from the air outlet, first air groove and second air groove will produce low pressure area, this low pressure area can guide outside air from entering second air groove, and outside air from the process that Venturi valve enters second air groove, the air amount that Venturi valve works makes into second air groove is constant, and the first through -hole on first shunt board can fully disperse high -speed airflow to reduce the probability that high -speed airflow concentrates in a certain area and discharges.

[0049] From the above, the utility model not only can realize constant suction air volume operation, but also can make the discharged air uniformity better, will not appear concentrated in a certain area and discharge phenomenon, and the above two functions can also coordinate and cooperate, make the airflow pressure in whole device main part can realize dynamic balance. BRIEF DESCRIPTION OF DRAWINGS

[0050] ATTACHED Figure 1 It is whole structure schematic diagram in the embodiment of the utility model;

[0051] ATTACHED Figure 2 It is nozzle mouth structure schematic diagram in the embodiment of the utility model.

[0052] In the above drawing: 1, device main part;2, wind gathering cover;3, air outlet cover;4, first shunt board;5, second shunt board;6, first air groove;7, second air groove;8, connecting port;9, air inlet;10, nozzle mouth;11, air supply inlet;12, air supply outlet;14, heater;15, Venturi valve;16, first flow guide surface;17, second flow guide surface;18, air guide cover;19, first guide surface;20, second guide surface;21, filter block;22, bending channel.

[0053] 801, backflow gap;

[0054] 131, first through -hole;

[0055] 132, second through -hole DETAILED DESCRIPTION

[0056] The utility model will be further described in connection with the drawings and examples:

[0057] Example: the following will be with the drawing and detailed description to the case of clear explanation, any person skilled in the art after understanding the embodiment of the case, when can by the technology taught by the case, change and modification, it does not depart from the spirit and scope of the case.

[0058] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting thereof. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0059] Referring to the drawings Figures 1-2 As shown in the drawings, an air inducer comprises a device body 1, a wind collecting cover 2 and an air outlet cover 3.

[0060] A first air passage slot 6 is formed in the upper surface of the device body 1, a second air passage slot 7 is formed in the lower surface of the device body 1, and a connecting port 8 is formed between the first air passage slot 6 and the second air passage slot 7 in the device body 1, so as to connect the first air passage slot 6 and the second air passage slot 7.

[0061] The wind collecting cover 2 is positioned in the first air passage slot 6, and the wind collecting cover 2 is funnel-shaped with a wide upper end and a narrow lower end, and the upper end is an air inlet 9, and the lower end is provided with a nozzle port 10 for air outlet; the nozzle port 10 is arranged corresponding to the connecting port 8, and the diameter of the nozzle port 10 is smaller than that of the connecting port 8, so as to form a backflow gap 801 therebetween.

[0062] The air outlet cover 3 is positioned and connected at the slot of the second air passage slot 7, and the air outlet cover 3 comprises an air inlet 11 located at the upper side and an air outlet 12 located at the lower side, and the diameter of the air inlet 11 is smaller than that of the air outlet 12; the air inlet 11 is in air path communication with the nozzle port 10.

[0063] A first shunt plate 4 is arranged in the air outlet cover 3, and a plurality of first through holes 131 are uniformly distributed on the first shunt plate 4.

[0064] The air inducer further comprises a Venturi valve 15, and the air inlet of the Venturi valve 15 is arranged corresponding to the air outlet side of the device body 1, the air outlet of the Venturi valve 15 is in air path communication with the second air passage slot 7, and the second air passage slot 7 is in air path communication with the first air passage slot 6 through the backflow gap 801.

[0065] In this embodiment, the Venturi valve operates as a constant airflow component because when the airflow through the Venturi valve is small, the airflow velocity is relatively low, and the resulting pressure drop is also small. At this time, the backward suction force on the valve core is small, so the valve core is positioned relatively forward (i.e., close to the inlet, with the valve throat in the middle region of the Venturi valve). Due to the forward position of the valve core, the effective cross-sectional area of ​​the airflow through the valve is relatively large, thus maintaining a constant airflow level. When the airflow through the Venturi valve is large, the airflow velocity increases, and the resulting pressure drop also increases. At this time, the backward suction force on the valve core increases, and the valve core moves towards the valve throat. Due to the backward movement of the valve core, the effective cross-sectional area of ​​the airflow through the valve decreases, but the flow velocity increases, thus maintaining a constant airflow.

[0066] In this embodiment, the venturi valve can be installed on both sides of the main body of the device.

[0067] In this invention, a constant intake air volume and a fully dispersed airflow from the nozzle can be achieved by cooperating with a venturi valve and a first diverter plate. Specifically, when the high-speed airflow from the nozzle is discharged from the air outlet, a low-pressure zone is generated between the first and second vents. This low-pressure zone can guide outside air into the second vent. During the process of outside air entering the second vent through the venturi valve, the venturi valve works to keep the amount of air entering the second vent a constant. At the same time, the first through hole on the first diverter plate can fully disperse the high-speed airflow to reduce the probability of the high-speed airflow being concentrated and discharged in a certain area.

[0068] In some specific embodiments, the airflow on the air inlet side above the main body 1 flows sequentially through the air inlet 9, the nozzle 10, the air supply inlet 11 and the air supply outlet 12 to form a first flow path.

[0069] With the above design, the airflow will generate negative pressure at the upper end of the wind-gathering shroud after passing through the first flow path.

[0070] For details, please refer to Figure 1 High-speed airflow enters from the air inlet 9 and is then actively ejected from the nozzle 10. After that, it passes through the air supply inlet 11 and the air supply outlet 12 in sequence to reach the target area, such as indoors.

[0071] In some specific embodiments, a portion of the airflow on the lower air outlet side of the device body 1 forms a second flow path through the Venturi valve 15, the return gap 801 of the second venting groove 7, and the first venting groove 6.

[0072] With the above design, a portion of the airflow on the air outlet side below the main body of the device (generally, when the main body of the device is installed at the air outlet of the air conditioner, the venturi valve is in the room, that is, this portion of the airflow is the indoor airflow) can flow back and mix with the high-speed airflow.

[0073] In some embodiments, the air outlet cover 3 is further provided with a second flow distribution plate 5 corresponding to the first flow distribution plate 4, and the first flow distribution plate 4 and the second flow distribution plate 5 are spaced apart;

[0074] The second flow distribution plate 5 is uniformly provided with a plurality of second through holes 132, and each first through hole 131 and each second through hole 132 are arranged in a staggered manner as viewed from the top.

[0075] In the above scheme, a certain distance is provided between the first flow distribution plate and the second flow distribution plate, and a certain distance is also provided between the first flow distribution plate and the air supply inlet. When high-speed airflow enters the air outlet cover through the air supply inlet, it first disperses through the distance between the first flow distribution plate and the air supply inlet, and then enters the distance between the first flow distribution plate and the second flow distribution plate through the through holes on the first flow distribution plate, realizing secondary dispersion. In this way, the air can be fully discharged uniformly, and the phenomenon of air discharge in a certain area is unlikely to occur.

[0076] In some embodiments, the upper surface of the air outlet cover 3 is a airflow guide surface, which includes a first airflow guide surface 16 and a second airflow guide surface 17, and the first airflow guide surface 16 and the second airflow guide surface are symmetrically arranged with the air supply inlet 11 as a reference.

[0077] As viewed from the cross-sectional perspective, the first airflow guide surface and the second airflow guide surface combine to form an eight-shaped structure with high middle and low sides.

[0078] With the above design, the air sucked into the low-pressure area can be separated from the high-speed airflow at a higher efficiency (i.e., not mixed at the air supply inlet and the two flow distribution plates). In the ideal state during operation, the high-speed airflow and the sucked air are completely separated, so that the pressure in the low-pressure area is not affected. In particular, in the case of the flow distribution plate provided in the present application, it is more necessary to separate the high-speed airflow and the sucked air, because once the high-speed airflow contacts the flow distribution plate, airflow dispersion will occur. For reference Figure 1 It is directly impacted on the air path between the low-pressure Venturi valve and the second air slot (i.e., the bending channel below), so that the amount of air sucked in is reduced.

[0079] In some embodiments, the air outlet cover 3 is provided with an air guide cover 18 positioned and connected with the air supply inlet 11;

[0080] The air guide cover 18 is provided with a hollow cavity with a wide upper part and a narrow lower part, which is in air communication with the nozzle port 10 and the air supply inlet 11, and the hollow cavity serves as a guide part for the airflow entering the air supply inlet 11 from the upper air inlet side of the guide device main body 1;

[0081] The air guide cover 18 has an air flow guide surface outside, which cooperates with the air flow guide surface to guide the air in the second air passage 7 into the first air passage 6.

[0082] When the air flows in the first flow path and the second flow path, the air guide cover 18 is configured as a partition of the first flow path and the second flow path.

[0083] The air flow guide surface includes a first guide surface 19 and a second guide surface 20;

[0084] The first guide surface 19 and the second guide surface 20 are vertically symmetrical with the air supply inlet 11 as a reference;

[0085] The first guide surface 19 intersects at an acute angle with the end opposite to the first flow guide surface 16; the second guide surface 20 also intersects at an acute angle with the end opposite to the second flow guide surface 17.

[0086] With the above design, the air sucked into the low pressure area can be actively separated from the high speed air flow, that is, the probability of mixing of the air sucked into the low pressure area with the high speed air at the air supply inlet is further reduced.

[0087] That is, the air guide cover 18 can guide the air flow into the air supply inlet 11, and also can isolate the first flow path and the second flow path, and can guide the air in the second air passage 7 into the first air passage 6.

[0088] In some embodiments, the device body 1 is provided with a bending channel 22 communicating with the second air passage 7, and a filter block 21 is positioned and connected in the bending channel 22. With the above design, the air sucked into the low pressure area can pass through the venturi valve and then enter the second air passage, and in this process, the venturi valve plays a role of constant air volume. At the same time, the air sucked into the low pressure area can be filtered to prevent sundries from accumulating at the connecting port.

[0089] In some embodiments, a heater 14 is arranged in the air path between the air supply inlet 11 and the nozzle port 10, and the heater 14 is configured to heat the air flow in the air path between the air supply inlet 11 and the nozzle port 10.

[0090] With the above design, the discharged air can be freely selected whether to be heated or not, so as to meet more use requirements, and the heater has a hollow isosceles trapezoidal structure, which can further reduce the probability of mixing of the air sucked into the low pressure area with the high speed air at the connecting port.

[0091] Working principle:

[0092] The high-speed airflow in the air conditioner unit outlet pipeline is directly guided into the wind collecting cover 2, and then is sprayed out from the nozzle 10, at this time the high-speed airflow will pass through the connecting port 8, the air supply inlet 11 and the air supply outlet 12 in turn, when the high-speed airflow is discharged, a low pressure area will be formed at the set interval of the side, and then the low pressure area will guide the outside air to enter the second air passage 7 from the venturi valve. Because the first guide surface 16 and the second guide surface 17 exist, the airflow passes through the two inclined surfaces in the same way, and therefore the first guide surface 16 is taken as an example for description.

[0093] That is, when the low pressure area starts to suck air, the airflow will enter the bent channel 22 through the venturi valve 15, and then the air in the bent channel 22 will flow along the first guide surface 16 until it impacts on the first guide surface 19. Because the first guide surface 19 exists, the airflow will gradually rise along the first guide surface 19 and enter the first air passage 6 through the connecting port 8, and in this process, the probability of mixing with the high-speed airflow is low.

[0094] At the same time, when the high-speed airflow enters the air supply inlet 11, it is first dispersed through the spacing between the first shunt plate 4 and the air supply inlet 11, and then enters the spacing between the first shunt plate 4 and the second shunt plate 5 from the through hole 13 on the first shunt plate 4 to realize secondary dispersion, so that the air can be discharged more uniformly, and the phenomenon of concentrated air discharge in a certain area will not easily occur.

[0095] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. An air induction device characterized by: The air inducer comprises a device body (1), a wind collecting cover (2) and an air outlet cover (3); A first air passage (6) with an upward slot is formed on the upper surface of the device body (1), a second air passage (7) with a downward slot is formed on the lower surface of the device body (1), and a connecting port (8) is formed between the first air passage (6) and the second air passage (7) in the device body (1) so as to communicate the first air passage (6) and the second air passage (7); The wind collecting cover (2) is positioned in the first air passage (6) and has a funnel shape with a wide upper end and a narrow lower end, the upper end of the wind collecting cover (2) is an air inlet (9), and the lower end of the wind collecting cover (2) is provided with a nozzle port (10) for air outlet; the nozzle port (10) is arranged corresponding to the connecting port (8); The caliber of the nozzle port (10) is smaller than that of the connecting port (8) so as to form a backflow gap (801) between the nozzle port (10) and the connecting port (8); The air outlet cover (3) is positioned and connected at the slot of the second air passage (7), the air outlet cover (3) comprises an air supply inlet (11) located at the upper portion and an air supply outlet (12) located at the lower portion; the caliber of the air supply inlet (11) is smaller than that of the air supply outlet (12), and the air supply inlet (11) is in air communication with the nozzle port (10); A first shunt plate (4) is arranged in the air outlet cover (3), and a plurality of first through holes (131) are uniformly distributed on the first shunt plate (4); The air inducer further comprises a Venturi valve (15), the air inlet of the Venturi valve (15) is arranged corresponding to the air outlet side of the device body (1), the air outlet is communicated with the second air passage (7), and the second air passage (7) is in air communication with the first air passage (6) through the backflow gap (801).

2. The air inducer of claim 1, wherein: The air flow at the air inlet side of the upper portion of the device body (1) sequentially flows through the air inlet (9), the nozzle port (10), the air supply inlet (11) and the air supply outlet (12) to form a first flow path.

3. The air inducer of claim 2, wherein: The air flow at the air outlet side of the lower portion of the device body (1) forms a second flow path through the Venturi valve (15), the second air passage (7), the backflow gap (801) and the first air passage (6).

4. The air inducer of claim 1, wherein: A second shunt plate (5) is further arranged in the air outlet cover (3), and the first shunt plate (4) and the second shunt plate (5) are arranged in a spaced manner; A plurality of second through holes (132) are uniformly distributed on the second shunt plate (5), and each first through hole (131) and each second through hole (132) are arranged in a staggered manner as viewed from the top.

5. The air inducer of claim 3, wherein: The upper surface of the air outlet cover (3) is an air flow guide surface, the air flow guide surface comprises a first flow guide surface (16) and a second flow guide surface (17), and the first flow guide surface (16) and the second flow guide surface (17) are horizontally symmetrically arranged with the air supply inlet (11) as a reference.

6. The air inducer of claim 5, wherein: An air guide cover (18) is arranged and connected with the air supply inlet (11) on the air outlet cover (3). The air guide cover (18) is internally provided with a hollow cavity with a wide upper part and a narrow lower part, which is in air path communication with the nozzle port (10) and the air inlet (11), and serves as a guide for air flow on the upper wind inlet side of the device body (1) to enter the air inlet (11); The air guide cover (18) is externally provided with an air flow guide surface, which cooperates with the air flow guide surface to guide the air flow in the second air slot (7) to enter the first air slot (6); When the air flow flows through the first flow path and the second flow path, the air guide cover (18) is configured as a separation part to isolate the first flow path and the second flow path.

7. The air inducer of claim 6, wherein: The air flow guide surface includes a first guide surface (19) and a second guide surface (20); The first guide surface (19) and the second guide surface (20) are vertically symmetrically arranged with the air inlet (11) as a reference; The first guide surface (19) intersects with the opposite end of the first air guide surface (16) at an acute angle; the second guide surface (20) also intersects with the opposite end of the second air guide surface (17) at an acute angle.

8. The air inducer of claim 3, wherein: The device body (1) is internally provided with a bent channel (22) connected to the second air slot (7), and a filter block (21) is positioned and connected in the bent channel (22).

9. The air inducer of claim 1, wherein: A heater (14) is arranged in the air path between the air inlet (11) and the nozzle port (10), and the heater (14) is configured to heat the air flow in the air path between the air inlet (11) and the nozzle port (10).

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