Air curtain range hood

Abstract

The utility model discloses an air curtain range hood which comprises a machine body, a fan assembly and a flow guide assembly, an air curtain cavity is formed in the machine body, an air inlet and an air outlet are formed in the machine body, and the air inlet and the air outlet are communicated to the air curtain cavity; a fan of the fan assembly is installed in the air curtain cavity and guides airflow to enter the air curtain cavity through the air inlet. The flow guide assembly comprises a first flow guide part and a second flow guide part, the first flow guide part is arranged on one side of the fan and provided with a flow guide face, a flow guide channel is formed between the flow guide face and the fan in a spaced mode and provided with an air inlet end and an air outlet end, the air inlet end communicates with the air inlet, and the air outlet end communicates with the air outlet; the flow guide surface is used for guiding airflow to flow from the air inlet end to the air outlet end; the second flow guide piece is arranged at the air outlet end and arranged between the air outlet end and the air inlet in a blocking mode. The air flow in the air curtain cavity is guided to flow along a specific path through the flow guide assembly, so that the air flow is prevented from flowing to the air inlet under the action of pressure difference at the air outlet end, and the air mixing phenomenon is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, and in particular to an air curtain range hood. Background Technology

[0002] Currently, air curtain range hoods use an air curtain cavity and its internal fan assembly to create an air curtain at the air outlet at the bottom of the hood, thus preventing the spread of cooking fumes. However, during the formation of the air curtain, airflow, driven by the fan, enters the air curtain cavity from the air inlet and flows towards the air outlet. New airflow continues to enter from the air inlet, resulting in a higher air pressure at the air outlet than inside the cavity, and a lower air pressure at the air inlet. This pressure difference causes air to flow from the high-pressure area to the low-pressure area. Therefore, some airflow at the air outlet may flow towards the air inlet due to the pressure difference, thus creating crossflow.

[0003] The consequences of cross-ventilation are multifaceted. First, cross-ventilation increases airflow loss at the outlet, thus reducing the air curtain speed. This makes it easier for cooking fumes to penetrate the air curtain's defenses, reducing the effectiveness of the range hood in blocking fumes. Second, cross-ventilation forces the fan to overcome more turbulent airflow resistance to maintain the air curtain's formation. In other words, to ensure the basic function of the air curtain, the fan must increase its power output, thereby consuming more electricity. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art, the present invention provides an air curtain range hood, which guides the airflow in the air curtain cavity to flow along a specific path through a flow guiding component, thereby avoiding the airflow from flowing to the air inlet due to pressure difference at the air outlet and effectively preventing cross-flow phenomenon.

[0005] The technical solution adopted by this utility model to solve its problem is:

[0006] A type of air curtain range hood, comprising,

[0007] The machine body has an air curtain cavity inside, and an air inlet and an air outlet on the machine body, both of which are connected to the air curtain cavity.

[0008] A fan assembly, including a fan, is installed in the air curtain cavity and guides airflow into the air curtain cavity through the air inlet;

[0009] The air guide assembly comprises a first air guide member and a second air guide member. The first air guide member is arranged on one side of the fan. The first air guide member has an air guide surface. The air guide surface and the fan are spaced apart to form an air guide channel. The air guide channel has an air inlet end and an air outlet end. The air inlet end is communicated with the air inlet. The air outlet end is communicated with the air outlet. The air guide surface is used to guide the air flow from the air inlet end to the air outlet end. The second air guide member is arranged on the air outlet end and is arranged between the air outlet end and the air inlet.

[0010] Further, the first air guide member comprises a guide cover. The guide cover covers the outer periphery of the fan. The guide cover is formed with the air guide surface towards the side surface of the fan. The air guide surface comprises a first air guide surface and a second air guide surface. The first air guide surface extends to the air inlet in an arc shape. The second air guide surface extends to the air outlet. The first air guide surface is used to guide the air flow to the second air guide surface. The second air guide surface is used to guide the air flow out of the air outlet to form an air curtain at the air outlet.

[0011] Further, the guide cover comprises a first guide section and a second guide section. The first guide section is an arc section and surrounds the fan. The second guide section extends from the end of the first guide section towards the air outlet. The first air guide surface is a circular arc guide surface arranged on the first guide section. The second air guide surface is an inclined surface arranged on the second guide section.

[0012] Further, the second air guide member comprises a guide plate. The guide plate and the guide cover are spaced apart to form a guide channel. The guide channel is used to guide the air flow at the air outlet end to flow towards the air outlet.

[0013] Further, the fan assembly comprises a base frame. The base frame is connected to the cavity wall of the air curtain cavity. The base frame is provided with an air guide opening. One side of the air guide opening is connected to one end of the guide cover so that the air guide opening is communicated with the guide channel. The air guide opening is communicated with the air outlet.

[0014] Further, the air curtain cavity comprises a mounting cavity section and an air guide cavity section which are communicated with each other. The air guide cavity section is located below the mounting cavity section. The fan assembly and the air guide assembly are both mounted in the mounting cavity section. The air inlet is arranged in the mounting cavity section. The air outlet is arranged at the bottom of the air guide cavity section.

[0015] Further, the base frame is arranged at the bottom end of the mounting cavity section so that the air guide opening is connected to the inlet of the air guide cavity section.

[0016] Further, the bottom frame is spaced apart from the air guide cavity section, a width of the air guide cavity section gradually decreases from one end close to the mounting cavity section to one end away from the mounting cavity section, so that one side wall of the air guide cavity section forms an air guide slope, and the air guide slope is used for guiding air flow to flow along the air guide opening to the air outlet.

[0017] Further, the air inlet is arranged on a side wall of the mounting cavity section, the air baffle is arranged opposite to the air inlet, two ends of the air baffle are connected to a top wall of the mounting cavity section and the bottom frame respectively, one end of the air guide plate is connected below the air inlet, and the other end of the air guide plate extends towards the fan.

[0018] Further, the fan assembly comprises two connecting frames, the two connecting frames are arranged at two ends of the bottom frame respectively, and two ends of the fan are connected to the two connecting frames respectively; and the connecting frame and the end wall of the air curtain cavity are detachably connected.

[0019] In summary, the air curtain range hood has the following technical effects:

[0020] 1) The first air guide member can receive and straighten the air flow entering the air curtain cavity, so that the air flow is concentrated into the air guide channel, the diffusion of the air flow in the air curtain cavity is reduced, and the originally relatively disordered air flow becomes orderly. The second air guide member guides and blocks the air flow at the air outlet end of the air guide channel, prevents the air flow at the air outlet end from flowing to the air inlet under the action of factors such as pressure difference, effectively reduces the air leakage phenomenon, and at the same time, the second air guide member can block the air flow at the air outlet end flowing towards the air inlet, change the direction of the backflow air flow, and make it return to the normal air curtain forming path, so as to ensure the stability and continuity of the air curtain.

[0021] 2) The air guide assembly guides the air flow in the air curtain cavity along a specific path, effectively avoids the air leakage phenomenon, reduces the wind loss at the air outlet, so that the air flow guided out of the air outlet has a certain speed, ensures the effect of the air curtain, and thus improves the adsorption efficiency of the range hood on the oil fume. At the same time, the fan does not need to overcome the disorder resistance of the air flow, so as to reduce the energy loss and improve the energy utilization efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Fig. 1 is a longitudinal sectional view of an air curtain range hood according to an embodiment of the present application;

[0023] Figure 2 Fig. 1 is a longitudinal sectional view of an air curtain range hood according to an embodiment of the present application;

[0024] Figure 3 Fig. 1 is a longitudinal sectional view of an air curtain range hood according to an embodiment of the present application;

[0025] Figure 4 It is the split schematic view of fan assembly and flow guide assembly of the utility model embodiment;

[0026] Figure 5 It is the whole structure schematic view of the wind curtain range hood of the utility model embodiment.

[0027] Among them, the sign meaning is as follows:

[0028] 1, machine body; 11, wind curtain cavity; 110, installation cavity section; 111, air guide cavity section; 112, air guide slope; 12, air inlet; 13, air outlet; 2, fan; 21, underframe; 22, air guide port; 23, connecting frame; 3, flow guide assembly; 31, first flow guide piece; 311, flow guide channel; 32, second flow guide piece; 321, guide channel. DETAILED DESCRIPTION

[0029] In order to better understand and implement, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment.

[0030] In the description of the utility model, it needs to be explained that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0032] Referring to Figure 1 And Figure 5 The utility model discloses a kind of wind curtain range hood, it includes machine body 1, fan assembly and flow guide assembly 3. Specifically, wind curtain cavity 11 is provided in machine body 1, air inlet 12 and air outlet 13 are provided on machine body 1, and air inlet 12 and air outlet 13 are all through to wind curtain cavity 11. Among them, fan assembly includes fan 2, fan 2 is installed in wind curtain cavity 11, and air flow is guided to enter wind curtain cavity 11 via air inlet 12.

[0033] Further, the air guide assembly 3 comprises a first air guide 31 and a second air guide 32. Specifically, the first air guide 31 is arranged at one side of the fan 2. The first air guide 31 has an air guide surface, and an air guide channel 311 is formed between the air guide surface and the fan 2. The air guide channel 311 has an air inlet end and an air outlet end. The air inlet end is in communication with the air inlet 12, and the air outlet end is in communication with the air outlet 13. The air guide surface is used to guide the airflow to flow from the air inlet end to the air outlet end. The second air guide 32 is arranged at the air outlet end and is arranged between the air outlet end and the air inlet 12.

[0034] Based on the above structure, when the air curtain range hood is used, after the air curtain range hood is started, the fan 2 starts to operate to generate suction. Under the action of the pressure difference, the external air is sucked into the air curtain cavity 11 through the air inlet 12 on the machine body 1. The fan 2 continuously provides power to keep the airflow in a flowing state in the air curtain cavity 11. Specifically, after the airflow is sucked into the air curtain cavity 11 by the fan 2, the airflow enters the air guide channel 311 formed between the air guide surface of the first air guide 31 and the fan 2. The airflow enters the air guide channel 311 from the air inlet end and flows to the air outlet end along the air guide channel 311 under the guidance of the air guide surface. When the airflow flows out of the air outlet end of the air guide channel 311, the airflow is guided to the air outlet 13. At the same time, the second air guide 32 further guides and restricts the airflow at the air outlet end.

[0035] The first air guide 31 can receive and straighten the airflow entering the air curtain cavity 11, so that the airflow is concentrated into the air guide channel 311, reducing the diffusion of the airflow in the air curtain cavity 11 and making the airflow originally possibly more disordered become orderly. After passing through the air guide channel 311, the airflow can flow to the air outlet 13 in a predetermined direction and at a relatively uniform speed, thereby helping to form a stable and uniform air curtain. The second air guide 32 guides and blocks the airflow at the air outlet end to prevent the airflow at the air outlet end from flowing to the air inlet 12 under the action of the pressure difference, thereby effectively reducing the phenomenon of air leakage.

[0036] It should be noted that because the air pressure at the air outlet end is higher than the air pressure at the air inlet 12, there is a risk that the airflow at the air outlet end will flow reversely to the air inlet 12 under the action of the pressure difference. In addition, the airflow at the air outlet end is easily rotated by one turn under the driving of the fan 2 and the action of inertia, and then interferes with the airflow coming from the air inlet 12. The second air guide 32 can block the airflow at the air outlet end flowing to the air inlet 12 and change the direction of the backflowing airflow, so that the airflow returns to the normal air curtain forming path, thereby ensuring the stability and continuity of the air curtain.

[0037] Thus, the air flow is guided along a specific path out of the air outlet 13 by the first flow guide 31 and the second flow guide 32, avoiding the occurrence of air flow disorder and reducing the air loss at the air outlet 13, so that the air flow guided out of the air outlet 13 has a certain speed, ensuring the effect of the air curtain. At the same time, the fan 2 does not need to overcome the air flow disorder resistance, thereby reducing energy loss and improving energy utilization efficiency.

[0038] Further, referring to Figure 2 , the first flow guide 31 comprises a flow guide cover, which is arranged around the fan 2 and has a flow guide surface formed on the side surface of the fan 2. Specifically, the flow guide surface comprises a first flow guide surface and a second flow guide surface, the first flow guide surface extends in an arc shape to the air inlet 12, and the second flow guide surface extends to the air outlet 13. The first flow guide surface is used to guide the air flow to the second flow guide surface, and the second flow guide surface is used to guide the air flow out of the air outlet 13 to form an air curtain at the air outlet 13.

[0039] On the basis of the above structure, when the air curtain range hood is started and the fan 2 starts to work, the external air enters the air curtain cavity 11 through the air inlet 12 under the suction of the fan 2. The entering air flow is first received by the first flow guide surface of the first flow guide cover. Since the first flow guide surface extends in an arc shape to the air inlet 12, the air flow begins to change its initial entering direction along the arc profile of the first flow guide surface and is gradually guided to the second flow guide surface. Under the guidance of the first flow guide surface, the air flow smoothly transitions to the second flow guide surface, and then the second flow guide surface further guides the air flow to flow to the air outlet 13 in a predetermined direction and angle, and finally forms an air curtain at the air outlet 13.

[0040] The arc shape of the first flow guide surface can make the air flow entering the air inlet 12 from different directions gradually integrated into air flow flowing in a relatively uniform direction along the flow guide surface after contacting the first flow guide surface, reducing the degree of disorder of the air flow in the initial stage of entering the air curtain cavity 11. The connection between the first flow guide surface and the second flow guide surface realizes the smooth transition of the air flow. When the air flow transitions from the first flow guide surface to the second flow guide surface, it will not produce violent energy loss or turbulence phenomenon due to sudden change of direction.

[0041] Further, referring to Figure 3 and Figure 4 , the flow guide cover comprises a first flow guide section and a second flow guide section connected to each other, specifically, the first flow guide section is in an arc shape and is arranged around the fan 2; the second flow guide section extends from the end of the first flow guide section towards the air outlet 13. The first flow guide surface is a circular arc guide surface arranged on the first flow guide section, and the second flow guide surface is an inclined surface arranged on the second flow guide section.

[0042] Thus, the arc-shaped structure of the first flow guide section enables the airflow entering from the air inlet 12 to form a relatively orderly circular flow state around the fan 2, reducing mutual interference and turbulence between the airflows. Meanwhile, according to the principle of fluid mechanics, when the airflow flows along a curved surface, the speed of the airflow will increase due to the curvature of the path. When the airflow transitions from the first flow guide section to the inclined surface of the second flow guide section, the airflow can be guided by the inclined surface towards the direction of the air outlet 13. In this way, the airflow ejected from the air outlet 13 has sufficient speed to form an effective air curtain to block the oil fume.

[0043] Further, the second flow guide member 32 comprises a flow guide plate, and the flow guide plate and the flow guide cover are spaced apart to form a guide channel 321, wherein the guide channel 321 is used to guide the airflow at the air outlet end to flow towards the air outlet 13.

[0044] On the basis of this structure, after the airflow enters the flow guide channel 311 between the flow guide cover and the fan 2, the airflow flows to the air outlet end under the guidance of the flow guide surface, and then enters the guide channel 321 formed by the spacing between the flow guide plate and the flow guide cover. The airflow is further constrained and guided in the guide channel 321 to advance towards the direction of the air outlet 13.

[0045] Thus, the flow guide plate blocks the path of the airflow flowing into the air inlet 12 on the one hand, ensuring that the airflow from the air outlet end cannot rotate one circle around the fan 2 under the action of the fan 2 or inertia to return to the air inlet 12; on the other hand, the flow guide plate guides and changes the direction of the airflow at the air outlet end, so that the airflow can only advance towards the direction of the air outlet 13. In addition, the guide channel 321 limits and adjusts the airflow through the boundaries on both sides, so that the airflow can accurately flow towards the direction of the air outlet 13, thereby ensuring the consistency and stability of the angle during the formation of the air curtain and improving the blocking effect of the air curtain on the oil fume.

[0046] Further, the fan assembly comprises a chassis 21, specifically, the chassis 21 is connected to the cavity wall of the air curtain cavity 11, and the chassis 21 is provided with an air guide opening 22. Wherein, one side of the air guide opening 22 is connected to one end of the flow guide cover, so that the air guide opening 22 communicates with the guide channel 321; and the air guide opening 22 communicates with the air outlet 13.

[0047] Wherein, the flow guide plate is arranged on the other side of the air guide opening 22 and is arranged opposite to the end of the flow guide cover to form the guide channel 321.

[0048] Thus, the airflow in the guide channel 321 can enter the air guide opening 22; the airflow entering the air guide opening 22 is ultimately directed to the air outlet 13 connected to the air guide opening 22 and ejected from the air outlet 13 to form an air curtain under the constraint and guidance of the air guide opening 22.

[0049] In this way, the base frame 21, as a part of the fan assembly, connects the cavity wall of the air curtain cavity 11, and provides stable support for the fan 2 and the flow guide assembly 3. During the operation of the air curtain range hood, the high-speed operation of the fan 2 will generate vibration and stress. Without the stable support of the base frame 21, the fan 2 and the flow guide structure may be displaced or deformed, thereby affecting the stability of the airflow passage and the normal flow of the airflow.

[0050] Further, the air curtain cavity 11 includes a mounting cavity section 110 and an air guide cavity section 111, and the air guide cavity section 111 is located below the mounting cavity section 110. The fan assembly and the flow guide assembly 3 are both mounted in the mounting cavity section 110. In addition, the air inlet 12 is provided in the mounting cavity section 110, and the air outlet 13 is provided at the bottom of the air guide cavity section 111.

[0051] On the basis of this structure, when the air curtain range hood starts to work, the fan assembly starts to operate in the mounting cavity section 110. Due to the suction force generated by the rotation of the fan 2, external air is sucked into the mounting cavity section 110 of the air curtain cavity 11 from the air inlet 12 provided in the mounting cavity section 110. The airflow entering the mounting cavity section 110 is received by the flow guide cover and gradually flows downward to the air guide cavity section 111 under the drive of the fan 2 and the guidance of the flow guide surface. In this process, the airflow undergoes a series of operations such as rectification, acceleration, and direction adjustment to ensure that it can travel according to the predetermined path and state.

[0052] When the airflow reaches the air guide cavity section 111 after being accelerated, it continues to flow inside the air guide cavity section 111 and is finally sprayed out from the air outlet 13 located at the bottom of the air guide cavity section 111, thereby forming an air curtain below the range hood. During cooking, the generated oil fume will encounter this air curtain when rising, and the air curtain will block the oil fume from spreading around by virtue of the blocking effect of the airflow, so that the oil fume is limited within a certain range, facilitating the subsequent absorption and discharge of the oil fume by other smoke exhaust components of the range hood.

[0053] Therefore, the mounting cavity section 110 provides installation space for the fan assembly and the flow guide assembly 3, and is also the initial area for the airflow to enter the air curtain cavity 11. The air inlet 12 is provided here so that external air can be smoothly sucked into the air curtain system; the fan 2 works in the mounting cavity section 110 and can effectively apply power to the sucked air. The air guide cavity section 111 mainly plays a role in guiding the airflow to finally form an air curtain, and its layout design below the mounting cavity section 110 meets the demand for the natural downward flow of the airflow and the formation of a barrier at the bottom. The airflow from the mounting cavity section 110 is further arranged and guided in the air guide cavity section 111, ensuring that the airflow sprayed out from the bottom air outlet 13 can form a continuous, uniform, and stable air curtain.

[0054] In addition, the partition design of the installation cavity section 110 and the air guide cavity section 111 is conducive to the reasonable layout and cooperative work of the components inside the air curtain range hood. The fan assembly focuses on inhaling and preliminarily driving the airflow in the installation cavity section 110, while the air guide cavity section 111 focuses on converting the airflow into an effective air curtain. The two cavity sections cooperate with each other, making the airflow treatment process of the air curtain range hood more orderly and efficient. At the same time, this partition also facilitates the maintenance and repair of the components in different cavity sections.

[0055] In some embodiments, the bottom frame 21 is arranged at the bottom end of the installation cavity section 110, so that the air guide opening 22 is connected to the inlet of the air guide cavity section 111.

[0056] On the basis of this structure, when the air curtain range hood is started, the fan 2 operates to generate suction, and external air enters from the air inlet 12 of the installation cavity section 110. Under the action of the fan 2, the air begins to flow in the flow guide channel 311 and reaches the air guide opening 22 at the bottom frame 21 under the guidance of the flow guide assembly 3.

[0057] Since the bottom frame 21 is arranged at the bottom end of the installation cavity section 110 and the air guide opening 22 is connected to the inlet of the air guide cavity section 111, the airflow can smoothly transition from the installation cavity section 110 to the air guide cavity section 111 through the air guide opening 22. In the air guide cavity section 111, the airflow is finally sprayed out from the air outlet 13 at the bottom of the air guide cavity section 111, forming an air curtain. In the whole process, the conversion of the airflow between different cavity sections is coherent and orderly, and the cooperative work of the components ensures that the airflow stably forms an air curtain to block the oil fume.

[0058] In some embodiments, the bottom frame 21 is arranged at the bottom end of the installation cavity section 110 and the air guide opening 22 is connected to the inlet of the air guide cavity section 111, achieving precise airflow transition from the installation cavity section 110 to the air guide cavity section 111 and reducing wind loss. This transition ensures that the airflow can accurately and correctly enter the air guide cavity section 111 for the final air curtain forming process after being driven and preliminarily guided by the fan 2.

[0059] In other embodiments, the bottom frame 21 is arranged apart from the air guide cavity section 111, and the width of the air guide cavity section 111 gradually decreases from one end close to the installation cavity section 110 to the other end away from the installation cavity section 110, so that one side wall of the air guide cavity section 111 forms an air guide inclined surface 112, wherein the air guide inclined surface 112 is used to guide the airflow to flow along the air guide opening 22 to the air outlet 13.

[0060] On this basis, when the wind curtain range hood is opened, the fan 2 operates in the installation cavity section 110, and air is sucked into the air guide channel from the air inlet 12 of the installation cavity section 110. Under the power of the fan 2 and the action of the air guide assembly 3, the air current reaches the air guide opening 22 at the base frame 21. The air current from the air guide opening 22 has a certain direction and speed, and enters the air guide cavity section 111 in the direction of the air guide cavity section 111. Since the width of the air guide cavity section 111 gradually decreases from the end close to the installation cavity section 110 to the end away from the installation cavity section 110, an air guide slope 112 is formed. Therefore, this part of the air current with a certain speed can flow along the air guide slope 112, and in this process, the flow direction of the air current is further guided and constrained.

[0061] It should be noted that in order to make the air curtain arranged at the air outlet 13 closer to the cooking bench, the two sides of the range hood are extended downward to form two side baffles, and the air outlet 13 is arranged at the bottom of the two side baffles, so that an air curtain is formed at the bottom of the two sides of the range hood. However, the air inlet 12 is still arranged at the side or top of the machine body 1; in this way, the distance between the air inlet 12 and the air outlet 13 increases, and the air flow in the air curtain cavity 11 will increase the wind loss, or the working strength of the fan 2 needs to be increased to maintain the speed of the air flow at the air outlet 13. Among them, the air guide cavity section 111 is arranged inside the two side baffles, and the fan assembly and the air guide assembly 3 cannot be arranged close to the air outlet 13 due to the space size of the air guide cavity section 111.

[0062] Therefore, the embodiment sets the air guide cover, and guides the air current in the air guide channel along the extension direction of the slope on the air guide surface to the air guide cavity section 111. After reaching the air guide cavity section 111, the air current is gradually gathered and accelerated in the direction of the air outlet 13 under the guiding action of the air guide slope 112, and finally is sprayed out from the air outlet 13 at the bottom of the air guide cavity section 111, forming an air curtain with a specific shape, strength and speed distribution, so as to effectively block the spread of oil fume generated in the cooking process.

[0063] Therefore, the embodiment overcomes the problem that the speed of the air current at the air outlet 13 decreases due to the distance between the fan assembly and the air outlet 13 after installation caused by the shape limitation of the cavity section, by arranging the air guide assembly 3 in the installation cavity section 110 and the air guide slope 112 in the air guide cavity section 111. The air guide slope 112 plays a guiding role in the process of the air current flowing from the air guide opening 22 to the air outlet 13, and provides a clear flow direction for the air current, so that the air current can flow orderly in the air guide cavity section 111.

[0064] In addition, the inclined angle of the air guide slope 112 is the same as that of the second guide surface. In this way, even if the chassis 21 is spaced apart from the air guide cavity section 111, the air flow guided from the second guide surface can be smoothly received by the air guide slope 112 having the same guide direction when advancing, and continue to flow along the coherent guide path to the air outlet 13. In this way, the air flow will not have problems such as sudden speed reduction or direction disorder due to long distance or space limitation during the entire flow process, thereby ensuring that the air flow can be sprayed from the air outlet 13 at a suitable speed and in a stable state.

[0065] Further, the air inlet 12 is arranged on the side wall of the mounting cavity section 110, the air guide cover is arranged opposite to the air inlet 12, and the two ends of the air guide cover are connected to the top wall of the mounting cavity section 110 and the chassis 21 respectively. One end of the air guide plate is connected below the air inlet 12, and the other end of the air guide plate extends towards the fan 2.

[0066] On the basis of this structure, when the air curtain range hood is started, the fan 2 starts to operate, and under the suction of the fan 2, external air is sucked into the air curtain cavity 11 from the air inlet 12 on the side wall of the mounting cavity section 110. Since the air inlet 12 is located on the side wall, the direction of the air flow entering is lateral, which makes the air flow have a certain initial direction and speed when entering. At this time, the air guide cover arranged opposite to the air inlet 12 starts to play a role in receiving and guiding these air flows.

[0067] Specifically, the guide surface (including the first guide surface and the second guide surface) of the air guide cover is opposite to the air inlet 12, so that the entering air flow first hits the first guide surface. The first guide surface is arc-shaped, and the air flow begins to change direction along the arc-shaped guide surface, gradually being guided from the lateral entering direction to the second guide surface. The second guide surface extends to the direction of the air outlet 13, and the air flow further adjusts the direction under the guidance of the second guide surface, so that the air flow can flow in an orderly manner towards the direction of the air outlet 13.

[0068] Among them, the fan 2 is arranged between the air guide cover and the air inlet 12, the air guide cover and the cavity wall of the air curtain cavity 11 form a relatively closed structure with a specific guide channel 311, and the arrangement of the air guide plate makes that there is only one one-way inlet and one one-way outlet in the circumferential direction of the fan 2. The air flow entering from the air inlet 12 and rectified by the air guide cover can only flow to the air guide cavity section 111 through the air guide opening 22, so as to ensure that the air flow flows along the predetermined path and does not appear backflow or shunt.

[0069] Therefore, the air guide cover arranged opposite to the air inlet 12 can optimize the air intake process. It can guide the air flow to enter the air curtain cavity 11 at a more suitable angle and speed, and reduce the resistance of the air flow at the air inlet 12.

[0070] Further, the fan assembly includes two connecting frames 23, and the two connecting frames 23 are respectively arranged at two ends of the base frame 21. Wherein, two ends of the fan 2 are respectively connected to the two connecting frames 23, and the connecting frame 23 is detachably connected to the end wall of the air curtain cavity 11.

[0071] On the basis of the structure, when the air curtain range hood is assembled, first, the two ends of the fan 2 are aligned with the two connecting frames 23 and connected, then the two connecting frames 23 are respectively placed at the two ends of the base frame 21, and the connecting frame 23 is connected to the base frame 21 by means of bolts, buckles and the like, and then the base frame 21 with the fan 2 is installed in the installation cavity section 110 through the connecting frame 23.

[0072] Since the connecting frame 23 is detachably connected to the end wall of the air curtain cavity 11, the installation process is relatively convenient. Specifically, the connecting frame 23 can be fixed to the mounting hole reserved on the end wall by using screws, so that the fan assembly is in a suitable position in the air curtain cavity 11.

[0073] When the air curtain range hood is started, the fan 2 starts to operate under the support of the two connecting frames 23. The rotation of the fan 2 generates suction, and air is sucked from the air inlet 12 on the side wall of the installation cavity section 110. Under the power of the fan 2, the airflow flows in the air curtain cavity 11, is guided by the flow guide assembly 3, and finally forms an air curtain from the air outlet 13. In this process, the connecting frame 23 stably supports the fan 2, ensuring that the fan 2 can work normally and will not be displaced due to its own vibration or other external forces.

[0074] When the fan 2 needs to be maintained or replaced, since the connecting frame 23 is detachably connected to the end wall of the air curtain cavity 11, the maintenance personnel can conveniently detach the connecting frame 23 from the end wall. Then, the fan 2 is taken off from the connecting frame 23, and the fan 2 is cleaned, maintained or directly replaced with a new fan 2. After the maintenance is completed, the fan 2 can be reinstalled in the air curtain cavity 11 according to the above installation process.

[0075] Therefore, the two connecting frames 23 are arranged at the two ends of the base frame 21 to connect the fan 2, and this structure provides stable support for the fan 2. The fan 2 will vibrate and generate axial force when it operates at high speed, and the connecting frame 23 can effectively withstand these forces to prevent the fan 2 from shaking or deviating during operation. The technical means disclosed in the utility model solution is not limited to the technical means disclosed in the above embodiments, but also includes technical solutions composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, without departing from the principles of the utility model, a number of improvements and refinements can be made, and these improvements and refinements are also considered within the protection scope of the utility model.

Claims

1. A range hood with an air curtain function, characterized in that: include, The machine body has an air curtain cavity inside, and an air inlet and an air outlet on the machine body, both of which are connected to the air curtain cavity. A fan assembly, including a fan, is installed in the air curtain cavity and guides airflow into the air curtain cavity through the air inlet; The airflow guiding assembly includes a first airflow guiding member and a second airflow guiding member. The first airflow guiding member is disposed on one side of the fan and has a guiding surface. An airflow guiding channel is formed between the guiding surface and the fan. The guiding channel has an air inlet end and an air outlet end. The air inlet end is connected to the air inlet port, and the air outlet end is connected to the air outlet port. The guiding surface is used to guide the airflow along the air inlet end to the air outlet end. The second airflow guiding member is disposed at the air outlet end and is positioned between the air outlet end and the air inlet port.

2. The air curtain range hood according to claim 1, characterized in that: The first air guide includes an air guide shroud, which is disposed on the outer periphery of the fan; the side of the air guide shroud facing the fan is formed as the air guide surface; the air guide surface includes a first air guide surface and a second air guide surface, the first air guide surface extends in an arc shape to the air inlet, and the second air guide surface extends to the air outlet; the first air guide surface is used to guide the airflow to the second air guide surface, and the second air guide surface is used to guide the airflow out of the air outlet to form an air curtain at the air outlet.

3. The air curtain range hood according to claim 2, characterized in that: The air guide shroud includes a first air guide section and a second air guide section that are connected to each other. The first air guide section is arc-shaped and is arranged around the fan. The second air guide section extends from the end of the first air guide section toward the air outlet. The first guiding surface is an arc-shaped guiding surface provided on the first guiding section, and the second guiding surface is an inclined surface provided on the second guiding section.

4. The air curtain range hood according to claim 2, characterized in that: The second air guide includes a guide plate, which forms a guide channel with the air guide cover at a distance. The guide channel is used to guide the airflow at the air outlet toward the air outlet.

5. The air curtain range hood according to claim 4, characterized in that: The fan assembly includes a base frame connected to the cavity wall of the air curtain cavity; the base frame is provided with an air guide port, one side of which is connected to one end of the air guide shroud so that the air guide port is connected to the guide channel; and the air guide port is connected to the air outlet.

6. The air curtain range hood according to claim 5, characterized in that: The air curtain cavity includes an interconnected installation cavity section and an air guide cavity section. The air guide cavity section is located below the installation cavity section. The fan assembly and the air guide assembly are both installed in the installation cavity section. The air inlet is located in the installation cavity section, and the air outlet is located at the bottom of the air guide cavity section.

7. The air curtain range hood according to claim 6, characterized in that: The base frame is disposed at the bottom end of the mounting cavity section so that the air guide port is connected to the inlet of the air guide cavity section.

8. The air curtain range hood according to claim 6, characterized in that: The base frame is spaced apart from the air guide cavity section. The width of the air guide cavity section gradually decreases from one end near the mounting cavity section to the end far from the mounting cavity section, so that one side wall of the air guide cavity section forms an air guide slope. The air guide slope is used to guide the airflow along the air guide port to the air outlet.

9. The air curtain range hood according to any one of claims 6-8, characterized in that: The air inlet is located on the side wall of the mounting cavity section, and the air guide shroud is located opposite to the air inlet. The two ends of the air guide shroud are respectively connected to the top wall of the mounting cavity section and the base frame. One end of the air guide plate is connected to the bottom of the air inlet, and the other end of the air guide plate extends toward the fan.

10. The air curtain range hood according to claim 6, characterized in that: The fan assembly includes two connecting frames, which are respectively disposed at both ends of the base frame, and both ends of the fan are respectively connected to the two connecting frames; the connecting frames are detachably connected to the end wall of the air curtain cavity.

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