Range hood

Abstract

The application provides a range hood, and relates to the technical field of kitchen appliances. The range hood comprises a main machine box, a fan and a flow guide piece. The fan is arranged in the main machine box, and the fan has a fan inlet. The flow guide piece is arranged in the main machine box, one end of the flow guide piece is connected with the fan, and a pre-rotation fan is arranged in the flow guide piece, and the pre-rotation fan is used for pre-straightening smoke flowing into the flow guide piece. In this way, the range hood has smaller noise and higher smoke exhaust efficiency.

Description

Technical Field

[0001] This application relates to the field of kitchen appliance technology, and in particular to a range hood. Background Technology

[0002] A range hood, also known as a cooking hood or exhaust hood, is a common kitchen appliance. It is usually installed above the stove to remove the fumes generated during cooking and exhaust them into the exhaust duct.

[0003] In related technologies, a range hood includes a main unit and a fan installed inside the main unit. The range hood uses the operation of the fan to remove fumes.

[0004] However, among related technologies, range hoods are noisy and have low smoke extraction efficiency. Utility Model Content

[0005] This application aims to provide a range hood to solve the problems of high noise and low smoke extraction in existing range hoods.

[0006] This application provides a range hood, including:

[0007] Main unit case;

[0008] The fan is located inside the main unit box and has a fan inlet;

[0009] The flow guide is located inside the main unit box. One end of the flow guide is connected to the fan. The flow guide is equipped with a pre-rotation fan, which is used to pre-rectify the flue gas flowing into the flow guide.

[0010] The range hood provided in this application embodiment allows the flue gas to be guided to the fan inlet via a guide component after entering the main unit. This results in a more stable flow of flue gas from the fume inlet to the fan inlet, reducing the likelihood of turbulent flow or flue gas separation caused by obstruction from the fan casing and top plate, thus minimizing separation noise. Furthermore, the stable flue gas flow also improves the fan's intake efficiency. In addition, the stable flow of flue gas entering the fan reduces noise generated by the fan impeller rotation. Moreover, the guide component gradually changes the flue gas direction, reducing the angle change of the flue gas as it enters the fan, minimizing abrupt impacts on the fan impeller, reducing turbulence losses, and mitigating boundary layer separation, thus reducing high-frequency aerodynamic noise. Furthermore, the relatively stable flow of flue gas from the fume inlet to the fan inlet reduces energy loss caused by airflow turbulence and eddy current shedding, resulting in lower energy loss of the flue gas entering the fan. This can reduce the noise of the range hood and improve its energy efficiency.

[0011] In addition, the pre-rotating fan increases the pressure of the flue gas entering the fan, compensating for the problem of insufficient diffusion in the fan casing, which prevents the airflow from converting kinetic energy into potential energy. This improves fan performance and flue gas extraction efficiency. Furthermore, the pre-rotating fan causes the flue gas flowing towards the fan inlet to rotate, creating a specific airflow angle. This rotation improves the flow pattern at the fan inlet, reducing noise from the impeller and further enhancing extraction efficiency. Additionally, the pre-rotating fan reduces the vortex region within the guide vanes, resulting in more stable flue gas flow and less energy loss during the flow process.

[0012] In one possible implementation, the flow guiding components include a smoke hood and a flow guiding pipe. The smoke hood has a smoke inlet and a smoke outlet, the main unit has an oil fume inlet, the smoke inlet is connected to the oil fume inlet, the smoke outlet is connected to the fan inlet through the flow guiding pipe, and the pre-rotating fan is located inside the flow guiding pipe.

[0013] In this way, the smoke collection by the fume hood improves the air intake efficiency of the fan, thereby improving the smoke exhaust efficiency of the range hood. Furthermore, the fume hood is connected to the fan inlet via a guide pipe, facilitating the stable guidance of smoke to the fan inlet. The guide pipe also gradually changes the direction of the smoke flow, reducing the angle change of the smoke as it enters the fan. Additionally, the pre-rotating fan is located inside the guide pipe, making its placement easier while minimizing its impact on the fume collection by the fume hood.

[0014] In one possible implementation, the guide pipe includes a straight section and an elbow section. One end of the straight section is connected to the smoke outlet, and the other end of the straight section is connected to one end of the elbow section, which in turn is connected to the fan inlet.

[0015] In this way, the flue gas entering the guide pipe first enters the straight pipe section. The flow resistance of the flue gas in the straight pipe section is small, making it less prone to eddies. The energy loss during the flue gas flow process is small, and the flue gas flow is more stable. In addition, the straight pipe section is connected to the fan inlet through an elbow section. The elbow section can be used to gradually change the flow direction of the flue gas, so that the flue gas flows towards the fan inlet at a better angle. This reduces the angle change of the flue gas when entering the fan, which is beneficial for noise reduction and improving the fan's intake efficiency.

[0016] In one possible implementation, the pre-rotating fan is located in the straight pipe section.

[0017] This makes the arrangement of the pre-rotating fan easier. In addition, directing the pre-rotating fan towards the bend section helps to reduce the vortex area generated in the bend section, which is beneficial for the stable flow of flue gas within the guide pipe.

[0018] In one possible implementation, the pre-rotating fan includes a pre-rotating impeller located at one end of the straight pipe section connecting to the elbow section.

[0019] In this way, the pre-swirl impeller is closer to the bend section, which helps to improve the vortex at the bend section through the drive of the pre-swirl impeller. In addition, the pre-swirl impeller is closer to the fan inlet, which helps to improve the flow pattern of the flue gas at the fan inlet.

[0020] In one possible implementation, the pre-rotating fan includes a fixed bracket, which is fixedly connected to one end of the straight pipe section connected to the smoke hood, making the assembly of the pre-rotating fan easier.

[0021] In one possible implementation, the pre-rotating fan also includes a pre-rotating impeller, a drive unit, and a transmission rod. The drive unit is fixedly connected to a fixed bracket, and the output end of the drive unit is connected to the pre-rotating impeller via the transmission rod. This allows for a more flexible relative position between the drive unit and the pre-rotating impeller, facilitating the flexible arrangement of the drive unit and the pre-rotating impeller.

[0022] In one possible implementation, the guide tube is a circular tube.

[0023] In this way, the resistance to flue gas flow within the guide pipe is relatively small, which is conducive to stable and low-energy-loss flow of flue gas. In addition, the guide pipe has a smaller impact on the rotation of flue gas driven by the pre-rotating fan, which helps to improve the flow pattern of flue gas at the fan inlet.

[0024] In one possible implementation, the fume hood is located at the fume inlet, the smoke inlet is located at the end of the fume hood closest to the fume inlet, the smoke outlet is located at the end of the fume hood furthest from the fume inlet, and the fan and guide pipe are both located on the side of the fume hood furthest from the fume inlet.

[0025] This facilitates the efficient collection and guidance of fumes to the fan inlet, resulting in a high smoke extraction efficiency for the range hood.

[0026] In one possible implementation, the fan has two fan inlets, located on opposite side walls of the fan. The range hood includes two guide vanes corresponding to each fan inlet, with one end of each guide vane connected to its respective fan inlet. Each guide vane contains a pre-swirl fan, which pre-swirls and rectifies the flue gas flowing into its respective guide vane.

[0027] In this way, while the fan has a large air intake volume, the range hood can have low noise, high smoke extraction efficiency, and high energy efficiency. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of a range hood provided in an embodiment of this application;

[0030] Figure 2 A schematic diagram of yet another type of range hood provided in this application embodiment;

[0031] Figure 3 A perspective view of the air guide of a range hood provided in an embodiment of this application;

[0032] Figure 4 A perspective view of the air guide of another type of range hood provided in an embodiment of this application;

[0033] Figure 5 A schematic diagram of yet another type of range hood provided in this application embodiment;

[0034] Figure 6 A perspective view of a range hood provided in an embodiment of this application;

[0035] Figure 7 A perspective view of another range hood provided in the embodiments of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100. Main unit chassis; 110. Fume inlet;

[0038] 200. Smoke hood;

[0039] 300. Fan; 310. Fan inlet; 310a. First fan inlet; 310b. Second fan inlet; 320. Fan outlet; 330. Fan impeller; 340. Volute;

[0040] 400. Flow guide; 400a. First flow guide; 400b. Second flow guide; 410. Smoke hood; 410a. First smoke hood; 410b. Second smoke hood; 411. Smoke inlet; 412. Smoke outlet; 420. Flow guide pipe; 420a. First flow guide pipe; 420b. Second flow guide pipe; 421. Straight pipe section; 422. Elbow section;

[0041] 500, Pre-rotating fan; 500a, First pre-rotating fan; 500b, Second pre-rotating fan; 510, Pre-rotating impeller; 520, Drive unit; 530, Fixed bracket; 540, Transmission rod;

[0042] 600. Smoke exhaust holder;

[0043] 700, Top plate. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the connection within two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] In related technologies, when range hoods release fumes through the fume inlet into the main unit, the fumes are obstructed by the fan casing, the top plate, and other structures, causing backflow. This results in turbulent fumes flow within the main unit, making them prone to flow separation and generating separation noise. Furthermore, the turbulent fumes affect the fan's intake efficiency, leading to lower exhaust efficiency. Additionally, the turbulent fumes flowing into the fan increase the noise generated by the fan impeller, resulting in higher overall fan noise. Moreover, the sudden angle change of the fumes entering the fan causes abrupt impacts on the fan impeller, increasing turbulence losses and significantly enhancing boundary layer separation, thus generating high-frequency aerodynamic noise. Furthermore, the flow pattern of flue gas at the fan inlet is poor, which can easily lead to insufficient diffusion within the fan casing, preventing the conversion of kinetic energy into potential energy. This results in poor fan performance and low smoke extraction efficiency for the range hood. In addition, turbulent flue gas flow generates significant energy loss during its movement. Therefore, range hoods in this technology suffer from high noise levels and low smoke extraction efficiency.

[0050] Figure 1 This is a schematic diagram of a range hood provided in an embodiment of this application. In the figure, the x-direction is the depth direction of the range hood, the y-direction is the width direction of the range hood, and the z-direction is the height direction of the range hood.

[0051] like Figure 1As shown, based on this, this application embodiment provides a range hood, which includes a main unit box 100, a fan 300, and a smoke collection hood 200. The main unit box 100 and the smoke collection hood 200 are fixedly connected. The main unit box 100 has a smoke inlet 110. The inner cavity of the main unit box 100 is connected to the inner cavity of the smoke collection hood 200 through the smoke inlet 110. The smoke collection hood 200 has a smoke inlet. The smoke inlet is connected to the smoke inlet 110 through the inner cavity of the smoke collection hood 200. The fan 300 is located inside the main unit box 100. By operating the fan 300, smoke can be drawn into the range hood from the smoke inlet and discharged to the exhaust pipe through the range hood.

[0052] For example, fan 300 can be a centrifugal fan.

[0053] For example, the fan 300 has a fan inlet 310 and a fan outlet 320 (e.g., Figure 6 As shown in the figure, when the fan 300 is running, the fan inlet 310 is used to draw the flue gas in the main unit box 100 into the fan 300, and the flue gas is discharged to the exhaust pipe through the fan outlet 320 under the drive of the fan 300.

[0054] For example, the fan 300 includes a volute 340 and a fan impeller 330 (e.g. Figure 6 As shown in the figure, the volute 340 has a fan inlet 310 and a fan outlet 320. The fan impeller 330 is disposed inside the volute 340. The rotating fan impeller 330 is used to draw the flue gas at the fan inlet 310 into the volute 340 and drive the flue gas inside the volute 340 to be discharged from the fan outlet 320.

[0055] like Figure 1 As shown, in some examples, the fume hood 200 is located below the main unit box 100, the lower end of the main unit box 100 is fixedly connected to the fume hood 200, the oil fume inlet 110 is located at the lower end of the main unit box 100, the fan 300 is vertically arranged inside the main unit box 100, the fan outlet 320 faces upward, and the fan inlet 310 faces horizontally. For example, the fan inlet 310 can face the width direction of the range hood.

[0056] Of course, in other examples, the relative positions of the fume hood 200 and the main unit box 100 can also be adjusted, and the position of the fume inlet 110 can be adjusted accordingly.

[0057] The following example illustrates the situation with the fume hood 200 located below the main unit box 100, the oil fume inlet 110 located at the lower end of the main unit box 100, and the fan 300 vertically positioned.

[0058] like Figure 1As shown, in some examples, the main unit 100 is also provided with a smoke exhaust seat 600, which is located above the fan 300. The fan outlet 320 is connected to the smoke exhaust seat 600, and the fan outlet 320 is connected to the smoke exhaust pipe through the smoke exhaust seat 600.

[0059] In some examples, the main unit 100 is also provided with a top plate 700, which is located above the fan 300 and is fixedly connected to the main unit 100. The exhaust seat 600 is located above the top plate 700 and is fixedly connected to the top plate 700. The fan outlet 320 is located below the top plate 700 and is fixedly connected to the top plate 700. The top plate 700 has a connecting port that connects the fan outlet 320 and the exhaust seat 600. The fan outlet 320 is connected to the exhaust seat 600 through the top plate 700 and the connecting port is connected to the exhaust seat 600. The top plate 700 can be used to support the exhaust seat 600 and can also be used to prevent the flue gas in the main unit 100 from continuing to flow upward.

[0060] In some examples, the fan 300 has two fan inlets 310, which are located on opposite side walls of the fan 300. For example, the two fan inlets 310 can be located on opposite side walls of the fan 300 in the width direction of the range hood. In this case, the fan 300 can have a larger air intake volume, which helps to improve the smoke extraction efficiency of the range hood.

[0061] Figure 2 This is a schematic diagram of another type of range hood provided in an embodiment of this application.

[0062] like Figure 2 As shown in the embodiment of this application, the range hood further includes a guide member 400, which is disposed inside the main unit housing 100. One end of the guide member 400 is connected to the fan 300, specifically, one end of the guide member 400 is connected to the fan inlet 310. The guide member 400 is used to guide the flue gas flowing into the main unit housing 100 to the fan inlet 310.

[0063] In this way, after the flue gas enters the main unit 100, it can be guided to the fan inlet 310 by the guide component 400. At this time, the flue gas flow from the oil fume inlet 110 to the fan inlet 310 is relatively stable, and it is less likely to cause flue gas flow disturbance or separation due to obstruction by the fan 300's volute 340 and top plate 700, thus reducing separation noise. In addition, the stable flue gas flow also helps to improve the air intake efficiency of the fan 300. Furthermore, the relatively stable flue gas flow entering the fan 300 helps to reduce the noise generated by the rotation of the fan impeller 330 of the fan 300. Moreover, the guide component 400 can gradually change the flow direction of the flue gas, thereby reducing the angle change of the flue gas when entering the fan 300, reducing the sudden impact on the fan impeller 330 of the fan 300, reducing turbulence losses, weakening boundary layer separation, and making it less likely to generate high-frequency aerodynamic noise. In addition, the flue gas flows relatively steadily from the fume inlet 110 to the fan inlet 310, which reduces energy loss caused by airflow turbulence and vortex shedding during the flow process, resulting in less energy loss of the flue gas entering the fan 300. This reduces the noise of the range hood and improves its energy efficiency.

[0064] Figure 3 This is a perspective view of the air guide of a range hood provided in an embodiment of this application.

[0065] like Figure 3 As shown, a pre-rotating fan 500 is provided inside the flow guide 400. The pre-rotating fan 500 is used to pre-rectify the flue gas flowing into the flow guide 400 and to drive the flue gas inside the flow guide 400 to flow toward the fan inlet 310.

[0066] Thus, by driving the pre-rotating fan 500, the pressure of the flue gas entering the fan 300 can be increased. This compensates for the problem of insufficient diffusion in the volute 340 of the fan 300, which prevents the airflow from converting kinetic energy into potential energy. This improves the performance of the fan 300 and enhances the flue gas extraction efficiency. Furthermore, by driving the pre-rotating fan 500, the flue gas flowing towards the fan inlet 310 gains a certain airflow angle due to rotation. This improves the flow pattern of the flue gas at the fan inlet 310, reducing noise generated by the fan impeller 330 and further enhancing the flue gas extraction efficiency. Additionally, driving the pre-rotating fan 500 reduces the vortex region within the guide vane 400, resulting in more stable flue gas flow and less energy loss during the flow process.

[0067] like Figure 2 , Figure 3As shown, in some possible embodiments, the guide component 400 includes a smoke collection hood 410 and a guide pipe 420, both of which are located within the main unit housing 100. The smoke collection hood 410 has a smoke inlet 411 and a smoke outlet 412. The smoke inlet 411 is connected to the fume inlet 110, and the smoke outlet 412 is connected to one end of the guide pipe 420. The other end of the guide pipe 420 is connected to the fan inlet 310, and the smoke outlet 412 is connected to the fan inlet 310 via the guide pipe 420. The smoke collection hood 410 is used to gather the smoke at the smoke inlet 411 and guide it to the smoke outlet 412, while the guide pipe 420 is used to guide the smoke at the smoke outlet 412 to the fan inlet 310.

[0068] In this way, the smoke collection hood 410 helps to improve the air intake efficiency of the fan 300, thereby improving the smoke exhaust efficiency of the range hood. In addition, the smoke collection hood 410 is connected to the fan inlet 310 through the guide pipe 420, which facilitates the stable guidance of the smoke to the fan inlet 310. The guide pipe 420 can also gradually change the flow direction of the smoke, which helps to reduce the angle change of the smoke when entering the fan 300.

[0069] In some examples, the pre-rotating fan 500 is located inside the guide pipe 420. The pre-rotating fan 500 is used to drive the flue gas from the smoke outlet 412 to the fan inlet 310, which makes it easier to arrange the pre-rotating fan 500 while minimizing its impact on the smoke collection of the smoke collection hood 410.

[0070] In some possible implementations, the fume hood 410 is located at the fume inlet 110, the fume inlet 411 is located at the end of the fume hood 410 close to the fume inlet 110, the fume outlet 412 is located at the end of the fume hood 410 away from the fume inlet 110, and the fan 300 and the guide pipe 420 are both located on the side of the fume hood 410 away from the fume inlet 110.

[0071] This facilitates the efficient collection and guidance of fumes to the fan inlet 310, resulting in a high smoke extraction efficiency for the range hood.

[0072] For example, the guide pipe 420 and the fan 300 are located above the smoke hood 410, the smoke inlet 411 is located at the lower end of the smoke hood 410, and the smoke outlet 412 is located at the upper end of the smoke hood 410.

[0073] For example, the guide pipe 420 is located on the side of the fan 300 in the width direction of the range hood.

[0074] In some possible implementations, the size of the smoke inlet 411 is larger than the size of the smoke outlet 412, and the inner wall of the smoke hood 410 gradually converges from the smoke inlet 411 to the smoke outlet 412.

[0075] In this way, the smoke in the smoke hood 410 is better gathered and guided, and the smoke is less likely to backflow, flow disorder, or flow separation in the smoke hood 410, which helps to make the smoke flowing into the smoke hood 410 flow to the smoke outlet 412 in a more stable manner.

[0076] For example, the inner wall of the smoke hood 410 is a sloping structure, that is, the inner wall of each side of the smoke hood 410 is a sloping structure, so as to facilitate the guidance of the smoke inside the smoke hood 410 to the smoke outlet 412. For example, the smoke hood 410 can be a trumpet-shaped structure.

[0077] For example, the vertical projection of the smoke outlet 412 is located within the vertical projection of the smoke inlet 411, and the edge of the vertical projection of the smoke outlet 412 is spaced apart from the edge of the vertical projection of the smoke inlet 411.

[0078] In some possible implementations, the guide pipe 420 includes a straight pipe section 421 and an elbow section 422. One end of the straight pipe section 421 is connected to the smoke outlet 412, and the other end of the straight pipe section 421 is connected to one end of the elbow section 422. The other end of the elbow section 422 is connected to the fan inlet 310.

[0079] In this way, the flue gas entering the guide pipe 420 first enters the straight pipe section 421. The flow resistance of the flue gas in the straight pipe section 421 is small, making it less prone to eddy currents, resulting in less energy loss during the flue gas flow and a more stable flue gas flow. In addition, the straight pipe section 421 is connected to the fan inlet 310 through the elbow section 422. The elbow section 422 can be used to gradually change the flow direction of the flue gas, so that the flue gas flows towards the fan inlet 310 at a better angle. This reduces the angle change of the flue gas when entering the fan 300, which is beneficial for noise reduction and improving the air intake efficiency of the fan 300.

[0080] For example, the straight pipe section 421 is arranged vertically, with its lower end connected to the smoke outlet 412 and its upper end connected to one end of the elbow section 422.

[0081] like Figure 3 As shown, in some possible implementations, the pre-rotating fan 500 is located in the straight pipe section 421.

[0082] This makes the arrangement of the pre-rotating fan 500 easier. In addition, the pre-rotating fan 500 blowing air towards the bend section 422 helps to reduce the vortex area generated by the bend section 422, which is conducive to the stable flow of flue gas within the guide pipe 420.

[0083] In some possible implementations, the guide tube 420 is a circular tube. That is, the cross-section of the guide tube 420 is circular, and the cross-section of the guide tube 420 refers to the section perpendicular to the extension direction of the guide tube 420.

[0084] In this way, the resistance to the flow of flue gas within the guide pipe 420 is relatively small, which is conducive to stable and low-energy-loss flow of flue gas. In addition, the guide pipe 420 has a smaller impact on the rotation of flue gas driven by the pre-rotation fan 500, which is beneficial to improving the flow pattern of flue gas at the fan inlet 310.

[0085] For example, the pre-rotating fan 500 includes a pre-rotating impeller 510, a drive device 520, and a fixed bracket 530. The drive device 520 is fixedly connected to the straight pipe section 421 through the fixed bracket 530. The pre-rotating impeller 510 is connected to the output end of the drive device 520. The drive device 520 is used to drive the pre-rotating impeller 510 to rotate. The rotating pre-rotating impeller 510 is used to drive the flue gas to flow from the flue gas outlet 412 to the fan inlet 310.

[0086] For example, the pre-rotating impeller 510 may have 4 to 8 blades. For instance, the pre-rotating impeller 510 may have 4 blades, which allows the pre-rotating impeller 510 to have a large air intake.

[0087] For example, the drive device 520 can be a motor.

[0088] In some possible implementations, the pre-rotating fan 500 is fixedly connected to one end of the straight pipe section 421 connected to the smoke hood 410 via a fixed bracket 530, making the assembly of the pre-rotating fan 500 easier.

[0089] For example, the drive unit 520 is fixedly connected to one end of the straight pipe section 421 connected to the smoke hood 410 via a fixing joint 530.

[0090] In some examples, the pre-rotating fan 500 also includes a transmission rod 540, and the output end of the drive unit 520 is connected to the pre-rotating impeller 510 through the transmission rod 540. The relative positions of the drive unit 520 and the pre-rotating impeller 510 are relatively flexible, which facilitates the flexible arrangement of the drive unit 520 and the pre-rotating impeller 510.

[0091] Figure 4 A perspective view of the air guide of another type of range hood provided in this application embodiment.

[0092] In some possible implementations, the pre-swirling impeller 510 is located at one end of the bend section 422 where the straight pipe section 421 connects to the guide pipe 420.

[0093] In this way, the pre-swirl impeller 510 is closer to the elbow section 422, which is beneficial for improving the vortex at the elbow section 422 through the drive of the pre-swirl impeller 510. In addition, the pre-swirl impeller 510 is closer to the fan inlet 310, which is beneficial for improving the flow pattern of the flue gas at the fan inlet 310.

[0094] Figure 5 This is a schematic diagram of yet another type of range hood provided in an embodiment of this application. Figure 6 This is a perspective view of a range hood provided in an embodiment of this application.

[0095] like Figure 5 , Figure 6 As shown, in some examples where the fan 300 has two fan inlets 310, the range hood includes two guide vanes 400 corresponding to each fan inlet 310. One end of each guide vane 400 is connected to the corresponding fan inlet 310, and the guide vane 400 is used to guide the flue gas flowing into the main unit 100 to the corresponding fan inlet 310. Each guide vane 400 is equipped with a pre-rotating fan 500, which is used to pre-rectify the flue gas flowing into its respective guide vane 400 and drive the flue gas in its respective guide vane 400 to flow towards the corresponding fan inlet 310.

[0096] In this way, while the fan 300 has a large air intake volume, the range hood can have low noise, high smoke extraction efficiency, and high energy efficiency.

[0097] For example, the two fan inlets 310 are designated as first fan inlet 310a and second fan inlet 310b, respectively, and the two guide vanes 400 are designated as first guide vane 400a and second guide vane 400b, respectively. One end of the first guide vane 400a corresponds to the first fan inlet 310a, and one end of the second guide vane 400b corresponds to the second fan inlet 310b. A pre-rotating fan 500 located within the first guide vane 400a is designated as the first pre-rotating fan 500a, and a pre-rotating fan 500 located within the second guide vane 400b is designated as the second pre-rotating fan 500b. The first guide member 400a is connected to the first fan inlet 310a. The first guide member 400a is used to guide the oil fumes flowing into the main unit 100 to the first fan inlet 310a. The first pre-rotating fan 500a is used to pre-rectify the flue gas flowing into the first guide member 400a and drive the flue gas in the first guide member 400a to flow towards the first fan inlet 310a. The second guide member 400b is connected to the second fan inlet 310b. The second guide member 400b is used to guide the flue gas flowing into the main unit 100 to the second fan inlet 310b. The second pre-rotating fan 500b pre-rectifies the flue gas flowing into the second guide member 400b and drives the flue gas in the second guide member 400b to flow towards the second fan inlet 310b.

[0098] For example, the fan inlet 310 is connected to the smoke outlet 412 of the smoke hood 410 of the corresponding guide member 400 through the guide pipe 420 of the guide member 400. Specifically, the smoke hood 410 of the first guide member 400a is the first smoke hood 410a, and the guide pipe 420 of the first guide member 400a is the first guide pipe 420a. The smoke hood 410 of the second guide member 400b is the second smoke hood 410b, and the guide pipe 420 of the second guide member 400b is the second guide pipe 420b. One end of the first guide pipe 420a is connected to the smoke outlet 412 of the first smoke hood 410a, and the other end of the first guide pipe 420a is connected to the first fan inlet 310a. The smoke outlet 412 of the first smoke hood 410a is connected to the first fan inlet 310a through the first guide pipe 420a. One end of the second guide pipe 420b is connected to the smoke outlet 412 of the second smoke hood 410b, and the other end of the second guide pipe 420b is connected to the inlet 310b of the second fan. The smoke outlet 412 of the second smoke hood 410b is connected to the inlet 310b of the second fan through the second guide pipe 420b.

[0099] For example, the smoke collection hoods 410 of the two guide members 400 are arranged side by side at the oil fume inlet 110 along the arrangement direction of the two fan inlets 310. That is, the first smoke collection hood 410a and the second smoke collection hood 410b are arranged side by side at the oil fume inlet 110 along the arrangement direction of the first fan inlet 310a and the second fan inlet 310b, so as to facilitate the flow of oil fumes from the oil fume inlet 110 into the main unit box 100 into the smoke collection hoods 410 of the two guide members 400, thereby improving the smoke exhaust efficiency of the range hood.

[0100] For example, the smoke hoods 410 of the two guide members 400 are arranged side by side along the width direction of the range hood. That is, the first smoke hood 410a and the second smoke hood 410b are arranged side by side along the width direction of the range hood.

[0101] For example, the guide pipes 420 of the two guide members 400 are respectively located on the side facing the corresponding fan inlet 310. That is, the first guide pipe 420a is located on the side facing the first fan inlet 310a, and the second guide pipe 420b is located on the side facing the second fan inlet 310b.

[0102] Figure 7 A perspective view of another range hood provided in the embodiments of this application.

[0103] like Figure 7As shown, exemplarily, the pre-rotating impeller 510 of the first pre-rotating fan 500a is disposed at one end of the straight section 421 of the first guide pipe 420a, which connects to the elbow section 422 of the first guide pipe 420a. The driving device 520 of the first pre-rotating fan 500a is fixedly connected to one end of the straight section 421 of the first guide pipe 420a, which connects to the first smoke hood 410a, via a fixing bracket 530 of the first pre-rotating fan 500a. The pre-rotating impeller 510 of the second pre-rotating fan 500b is disposed at one end of the straight section 421 of the second guide pipe 420b, which connects to the elbow section 422 of the second guide pipe 420b. The driving device 520 of the second pre-rotating fan 500b is fixedly connected to one end of the straight section 421 of the second guide pipe 420b, which connects to the second smoke hood 410b, via a fixing bracket 530 of the second pre-rotating fan 500b.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A range hood, characterized in that, include: Main unit case (100); A fan (300) is located inside the main unit housing (100), and the fan (300) has a fan inlet (310). A flow guide (400) is disposed inside the main unit box (100). One end of the flow guide (400) is connected to the fan (300). A pre-rotating fan (500) is provided inside the flow guide (400). The pre-rotating fan (500) is used to pre-rectify the flue gas flowing into the flow guide (400).

2. The range hood according to claim 1, characterized in that, The flow guide (400) includes a smoke hood (410) and a flow guide tube (420). The smoke hood (410) has a smoke inlet (411) and a smoke outlet (412). The main unit (100) has an oil fume inlet (110). The smoke inlet (411) is connected to the oil fume inlet (110). The smoke outlet (412) is connected to the fan inlet (310) through the guide pipe (420). The pre-rotating fan (500) is located inside the guide pipe (420).

3. The range hood according to claim 2, characterized in that, The guide pipe (420) includes a straight pipe section (421) and an elbow section (422). One end of the straight pipe section (421) is connected to the smoke outlet (412), and the other end of the straight pipe section (421) is connected to one end of the elbow section (422). The other end of the elbow section (422) is connected to the fan inlet (310).

4. The range hood according to claim 3, characterized in that, The pre-rotating fan (500) is located in the straight pipe section (421).

5. The range hood according to claim 4, characterized in that, The pre-rotating fan (500) includes a pre-rotating impeller (510), which is located at one end of the straight pipe section (421) connecting to the elbow section (422).

6. The range hood according to claim 4, characterized in that, The pre-rotating fan (500) includes a fixed bracket (530); The pre-rotating fan (500) is fixedly connected to one end of the straight pipe section (421) that is connected to the smoke hood (410) via the fixed bracket (530).

7. The range hood according to claim 6, characterized in that, The pre-rotating fan also includes a pre-rotating impeller (510), a drive unit (520), and a transmission rod (540). The drive device (520) is fixedly connected to the fixed bracket (530), and the output end of the drive device (520) is connected to the pre-rotating impeller (510) through the transmission rod (540).

8. The range hood according to any one of claims 2-7, characterized in that, The guide tube (420) is a round tube.

9. The range hood according to any one of claims 2-7, characterized in that, The fume hood (410) is located at the fume inlet (110), the smoke inlet (411) is located at the end of the fume hood (410) close to the fume inlet (110), the smoke outlet (412) is located at the end of the fume hood (410) away from the fume inlet (110), and the fan (300) and the guide pipe (420) are both located on the side of the fume hood (410) away from the fume inlet (110).

10. The range hood according to any one of claims 1-7, characterized in that, The fan (300) has two fan inlets (310), which are located on opposite side walls of the fan (300). The range hood includes two guide members (400) that correspond one-to-one with the fan inlet (310), and one end of the guide member (400) is connected to the corresponding fan inlet (310); Both of the flow guides (400) are equipped with a pre-rotating fan (500), which is used to pre-rectify the flue gas flowing into the flow guide (400).

Images