Flow guide device and range hood

Abstract

The utility model discloses a flow guide device and a range hood. The flow guide device is used for being arranged in an air inlet area of the range hood and comprises a flow guide plate and a linkage unit, and the linkage unit is connected with the flow guide plate and can drive the flow guide plate to move in the air inlet area. Therefore, the flow guide device and the range hood can effectively improve the oil smoke suction effect and reduce the generated noise at the same time.

Description

Technical Field

[0001] The utility model relates to the field of fans, and particularly to a flow guiding device and an oil fume machine. Background Art

[0002] Based on the continuous development in this field, the design of thin oil fume machines has gradually gained favor among users, leading to the continuous introduction of ultra-thin oil fume machines in the market. However, in thin oil fume machines, the reduction of the air duct of the fan in the thickness direction usually requires an increase in size in the radial direction of the fan to meet the requirements of the fan in terms of air volume and noise control. In the foregoing case, the diameter of the impeller in the fan and the air inlet of the fan are correspondingly enlarged, which in turn results in a decrease in the flow velocity of the air flow, and further affects the suction and exhaust effects of the oil fume machine.

[0003] For the foregoing problems, three solutions have been adopted in the prior art. First, those skilled in the art can perform a densification design on the inlet oil screen and the protective screen of the fan, which increases the wind speed at the inlet of the fan, thereby improving the oil fume suction effect. However, this solution is equivalent to imposing additional intake throttling on the fan. Therefore, the energy consumption required to achieve a predetermined air volume will inevitably increase, and the working noise will also increase by 0.4 to 0.7 dB. Moreover, abnormal aerodynamic noise is likely to occur in the setting mode of this solution.

[0004] Second, those skilled in the art can perform an optimized design on the shape of the smoke guiding flap at the inlet of the oil fume machine to increase the negative pressure area at the inlet of the oil fume machine, thereby increasing the smoke gathering area and further improving the oil fume suction effect. By way of example, the negative pressure area at the inlet of the oil fume machine can be increased by increasing the size and angle of the smoke guiding flap. However, the shape and size of the smoke guiding flap need to first meet the aesthetic requirements of the appearance design. Therefore, the space for optimization at the functional level is actually limited, and it is usually necessary to synergistically optimize the oil fume suction effect by increasing the air volume.

[0005] Third, those skilled in the art can directly increase the fan speed to increase the effective air volume entering the fan, thereby improving the oil fume suction effect. However, directly increasing the fan speed will also increase energy consumption and the resulting noise.

[0006] Therefore, there is a market demand for a flow guiding device and an oil fume machine that can effectively improve the oil fume suction effect while reducing the generated noise. Summary of the Utility Model

[0007] The technical problem to be solved by the utility model is to provide a flow guiding device and an oil fume machine in order to effectively improve the oil fume suction effect while reducing the generated noise.

[0008] The present utility model solves the above technical problems through the following technical solutions:

[0009] A flow guiding device, which is used to be arranged in the air inlet area of an oil fume extractor. The flow guiding device includes a flow guiding plate, and the flow guiding device further includes:

[0010] A linkage unit, which is connected to the flow guiding plate and can drive the flow guiding plate to move within the air inlet area.

[0011] In this solution, a linkage unit is arranged in the flow guiding device, so that the flow guiding device uses this linkage unit to realize the movement of the flow guiding plate within the air inlet area. In other words, the flow guiding plate in this solution can realize the displacement in position relative to the air inlet area through the linkage unit. Specifically, when the air intake efficiency needs to be improved urgently and the oil fume suction effect needs to be enhanced due to reasons such as excessive flue gas concentration at a specific position in the air inlet area, the flow guiding plate can move away from the aforementioned specific position through the linkage unit. At this time, when the airflow impacts on the flow guiding plate and is blocked and guided by the flow guiding plate, the air intake speed increases when the airflow enters the air inlet area from the edge of the flow guiding plate, and more airflow can be deflected in the opposite direction to the specific position through the blocking effect of the flow guiding plate, that is, the air intake efficiency at the specific position is improved, thereby bringing an improvement in the oil fume suction effect. Furthermore, the flow guiding plate also plays a role in evenly dispersing the airflow, that is, the airflow impacts on the flow guiding plate first, and the flow guiding plate uses its own shape to disperse and guide the airflow, so that the airflow enters the oil fume extractor in a more uniform manner.

[0012] In addition, since this solution can already achieve an improvement in the oil fume suction effect, the oil fume extractor itself no longer needs to improve the air intake efficiency by means such as encrypting the inlet oil screen and protective net of the fan or directly increasing the fan speed, and the noise problem caused by using the aforementioned methods will not occur, thereby achieving a reduction in the generated noise while effectively improving the oil fume suction effect.

[0013] Preferably, the linkage unit includes:

[0014] A first connecting rod, which is telescopically connected to the flow guiding plate.

[0015] In this solution, by adopting a first connecting rod that is telescopically connected to the flow guiding plate, a degree of freedom in the movement of the flow guiding plate is provided. The linkage unit in this solution can drive the flow guiding plate to move within the air inlet area through telescoping, and this movement mode is convenient and fast.

[0016] Preferably, the linkage unit is further characterized by including:

[0017] The first guide rail is arranged on one side of the air inlet area, and the end of the first connecting rod far from the deflector is slidably connected in the first guide rail.

[0018] In this solution, the end of the first connecting rod far from the deflector is slidably connected in the first guide rail, thereby providing another degree of freedom for the deflector in the moving aspect. Specifically, when the first connecting rod needs to move vertically in a direction perpendicular to the telescopic direction, the first connecting rod can move based on the first guide rail, thus providing another convenient and fast moving mode.

[0019] Preferably, a motor is arranged at one end of the first guide rail, a first slider connected to the first connecting rod is arranged in the first guide rail, and the motor is connected to the first slider and drives the first slider to slide to a specified position in the first guide rail.

[0020] In this solution, by arranging the motor, the user can directly use the motor to drive the first slider to slide in the first guide rail, and then realize the movement of the first connecting rod through the sliding of the first slider.

[0021] Preferably, the first connecting rod penetrates through the deflector, and the deflector is fixedly connected to the middle section of the first connecting rod. The linkage unit further includes:

[0022] The second guide rail is arranged on the other side of the air inlet area relative to the first guide rail, and the two ends of the first connecting rod are respectively connected in the first guide rail and the second guide rail.

[0023] In this solution, by arranging the second guide rail relative to the first guide rail, and after passing the first connecting rod through the deflector and connecting the two ends of the first connecting rod in the first guide rail and the second guide rail respectively, the first guide rail and the second guide rail are realized as the benchmarks that can be utilized when the two ends of the first connecting rod move simultaneously as the first connecting rod. At this time, the first connecting rod obtains the bilateral stability brought by the first guide rail and the second guide rail, thereby making the moving process smoother.

[0024] Preferably, a motor is arranged at one end of the first guide rail, a first slider connected to the first connecting rod is arranged in the first guide rail, and the motor is connected to the first slider and drives the first slider to slide to a specified position in the first guide rail; and / or, a second motor is arranged at one end of the second guide rail, a second slider connected to the first connecting rod is arranged in the second guide rail, and the second motor is connected to the second slider and drives the second slider to slide to a specified position in the second guide rail.

[0025] In this solution, by arranging a motor at one end of the first guide rail and / or the second guide rail, the user can directly use the motor to drive the first slider and / or the second slider to slide in the guide rail, and then realize the movement of the first connecting rod by means of the sliding of the slider. In the case where the motor is arranged only at one end of the second guide rail, it can be used as an alternative to the method of arranging the motor at one end of the first guide rail. In the case where motors are arranged at one ends of both the first guide rail and the second guide rail, the motors can be controlled to synchronously drive the sliding of the first slider and the second slider, making the movement of the first connecting rod more stable.

[0026] Preferably, the flow guiding device further includes: a plurality of sensors respectively arranged at different specified positions in the air inlet area, and the plurality of sensors are used to detect the smoke concentration value in the air inlet area; a controller, which is electrically connected to the plurality of sensors to receive the smoke concentration signal, and is electrically connected to the motor and the second motor, and is used to start the motor and / or the second motor to move the flow guiding plate after receiving the smoke concentration signal.

[0027] In this solution, by arranging the sensors and the controller, the flow guiding device can monitor the smoke concentration values at different positions in the air inlet area of the range hood, detect the smoke concentration value in real time, and then know which specific position urgently needs to improve the air intake efficiency and enhance the oil fume suction effect. Thus, the flow guiding plate is accurately moved away from the specific position, and more air flow is directed to the specific position by means of blocking and deflecting, so as to achieve the aforementioned purpose.

[0028] Preferably, the flow guiding device includes two sets of linkage units arranged at an angle to each other. The flow guiding plate moves within a rectangular range. One set of linkage units is arranged between the upper edge and the lower edge of the rectangular range, and the other set of linkage units is arranged between the left edge and the right edge of the rectangular range.

[0029] In this solution, by arranging the two sets of linkage units at an angle to each other, the flow guiding plate can move along both the width direction and the length direction of the rectangular range, providing another degree of freedom for displacement.

[0030] A range hood, which includes the flow guiding device described in any one of the above.

[0031] In this solution, by being provided with the above-mentioned flow guiding device, the range hood can effectively improve the oil fume suction effect while reducing the generated noise.

[0032] Preferably, the range hood includes a fan, the fan includes a front disk facing the air inlet area and a rear disk away from the air inlet area. The deflector moves vertically in the air inlet area in the direction perpendicular to the air intake direction of the range hood. At least part of the deflector protrudes towards the outside of the range hood, and a chamber filled with sound-absorbing material is formed inside the deflector. The deflector guides the air flow to the front disk. On the basis of conforming to the common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0033] In this solution, at least part of the deflector protrudes towards the outside of the range hood, and the protrusion is used to further guide the air flow. Thus, when the air flow impacts the deflector, the air flow can flow through the protruding deflector and go to the front disk of the fan facing the air inlet area, thereby improving the utilization efficiency of the front disk of the fan and further enhancing the oil fume absorption effect. On the basis of the above, a chamber filled with sound-absorbing material is formed inside the deflector, so that the sound-absorbing material can be used to further achieve noise reduction.

[0034] The positive and progressive effects of the present invention are as follows: The deflector device and the range hood in the present invention can effectively improve the oil fume absorption effect while reducing the generated noise, showing remarkable progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a perspective structural view of a range hood according to an embodiment of the present invention;

[0036] Figure 2 is a front structural view of a deflector device and an air inlet area according to an embodiment of the present invention;

[0037] Figure 3 is a perspective structural view (one) of a linkage unit according to an embodiment of the present invention;

[0038] Figure 4 is a perspective structural view (two) of a linkage unit according to an embodiment of the present invention;

[0039] Figure 5 is a perspective structural view of a deflector of a linkage unit according to an embodiment of the present invention;

[0040] Figure 6 is a cross-sectional view of a deflector of a linkage unit according to an embodiment of the present invention;

[0041] Figure 7 is a cross-sectional structural view of a deflector device and a fan according to an embodiment of the present invention.

[0042] Description of the Reference Numerals:

[0043] Range hood 1000

[0044] Air inlet area 1001

[0045] Fan 100

[0046] Front disc 101

[0047] Rear disc 102

[0048] Flow guiding device 200

[0049] Flow guiding plate 11

[0050] Linkage unit 20

[0051] First connecting rod 21

[0052] First guide rail 22

[0053] First slider 23

[0054] Motor 24

[0055] Second guide rail 25

[0056] Second slider 26

[0057] Connecting part 27

[0058] Sound absorbing material 30 Specific implementation mode

[0059] The present utility model will be further described below by way of embodiments, but the present utility model is not limited to the scope of the embodiments accordingly.

[0060] As Figure 1 and 2 shown, a flow guiding device 200 is used for being arranged in the air inlet area 1001 of a range hood 1000. The flow guiding device 200 includes a flow guiding plate 11, and the flow guiding device 200 further includes:

[0061] A linkage unit 20, the linkage unit 20 is connected to the flow guiding plate 11 and can drive the flow guiding plate 11 to move in the air inlet area 1001.

[0062] In specific implementation, a linkage unit 20 is provided in the flow guiding device 200, so that the flow guiding device 200 utilizes the linkage unit 20 to realize the movement of the flow guiding plate 11 within the air inlet region 1001. In other words, the flow guiding plate 11 in this embodiment can realize the displacement in position relative to the air inlet region 1001 through the linkage unit 20. Specifically, when the air intake efficiency needs to be improved urgently and the oil fume suction effect needs to be enhanced due to reasons such as excessive flue gas concentration at a specific position in the air inlet region 1001, the flow guiding plate 11 can move away from the aforementioned specific position through the linkage unit 20. At this time, when the air flow impacts on the flow guiding plate 11 and is blocked and guided by the flow guiding plate 11, the air intake speed increases when the air flow enters the air inlet region 1001 from the edge of the flow guiding plate 11, and more air flow can be deflected in the opposite direction to the specific position through the blocking effect of the flow guiding plate 11, that is, the air intake efficiency at the specific position is improved, thereby bringing about an improvement in the oil fume suction effect. Furthermore, the flow guiding plate 11 also plays a role in evenly dispersing the air flow, that is, the air flow first impacts on the flow guiding plate 11, and the flow guiding plate 11 uses its own shape to disperse and guide the air flow, so that the air flow enters the range hood 1000 in a more uniform manner. In this embodiment, the linkage unit 20 is connected to the flow guiding plate 11 through a connecting portion 27, and the connecting portion 27 is specifically presented as a hoop for the linkage unit 20. As an alternative implementation manner, those skilled in the art should also be able to think that other common connection methods in the art can be used, such as using threaded connection or snap connection to realize the connection between the linkage unit 20 and the flow guiding plate 11, and this embodiment does not limit this.

[0063] In addition, in view that the oil fume suction effect can be improved in this embodiment, the range hood 1000 itself no longer needs to improve the air intake efficiency by means such as encrypting the inlet oil screen and protection screen of the fan 100 or directly increasing the rotation speed of the fan 100, and the noise problem caused by the aforementioned methods will not occur, thereby realizing the reduction of the generated noise while effectively improving the oil fume suction effect. However, it should be noted that although the setting method in this embodiment can already realize the improvement of the oil fume suction effect and it is not necessary to adopt other setting methods for improving the air intake efficiency such as encrypting the inlet oil screen and protection screen of the fan 100 or directly increasing the rotation speed of the fan 100, those skilled in the art should also be able to think that the setting method in this embodiment and the aforementioned other setting methods for improving the air intake efficiency can be compounded according to actual needs. Without departing from the main idea of the present invention, this embodiment does not limit this.

[0064] As Figure 1 and 2 shown, the linkage unit 20 includes:

[0065] The first connecting rod 21 is telescopically connected to the deflector 11.

[0066] In a specific implementation, by adopting the first connecting rod 21 telescopically connected to the deflector 11, a degree of freedom in the moving aspect of the deflector 11 is provided. The linkage unit 20 in this embodiment can drive the deflector 11 to move within the air inlet area 1001 through telescoping, and this moving mode is convenient and fast. Specifically, the first connecting rod 21 adopted in this embodiment is made of an elastic material, so as to provide the ability of elastic linear telescoping. As an alternative implementation manner, those skilled in the art should also be able to think of adopting other common telescoping methods in this field, such as a rigid telescoping mechanism, a hydraulic pneumatic telescoping, a magnetic telescoping mechanism, etc., and this embodiment does not make a limitation on this.

[0067] In addition, in this embodiment, it can be regarded as Figure 1 and 2 In the flow guiding device 200, the four first connecting rods 21 are connected to the deflector 11, thereby giving a reference for the setting method. On this basis, those skilled in the art should also be able to think of adopting other numbers of first connecting rods 21, such as the substantial method of simultaneously connecting 8 or 12 first connecting rods 21 to the deflector 11 in the circumferential direction of the deflector 11, and this embodiment does not make a limitation on this.

[0068] As Figure 2 and 3 shown, the linkage unit 20 is further characterized by including:

[0069] The first guide rail 22 is arranged on one side of the air inlet area 1001, and the end of the first connecting rod 21 far from the deflector 11 is slidably connected in the first guide rail 22.

[0070] In a specific implementation, the end of the first connecting rod 21 far from the deflector 11 is slidably connected in the first guide rail 22, thereby providing another degree of freedom for the deflector 11 in the moving aspect. Specifically, when the first connecting rod 21 needs to move perpendicular to the telescoping direction, the first connecting rod 21 can move with the first guide rail 22 as a reference, thereby giving another convenient and fast moving mode.

[0071] As Figure 2 and 3 shown, a first motor 24 is arranged at one end of the first guide rail 22, a first slider 23 connected to the first connecting rod 21 is arranged in the first guide rail 22, and the first motor 24 is connected to the first slider 23 and drives the first slider 23 to slide to a specified position in the first guide rail 22.

[0072] In this embodiment, the setting method adopted is to set a motor only at one end of the first guide rail 22, thus presenting a simplest solution. However, those skilled in the art should also be able to think that in specific implementation, a motor can be set on one or both of the first guide rail 22 and the second guide rail 25. First guide rail 22, second guide rail 25, first slider 23, second slider 26, first connecting rod 21. When a motor is set only at one end of the second guide rail 25, it can be used as an alternative to the method of setting a motor at one end of the first guide rail 22, thus providing more optional positions for the position of setting the motor. When motors are set at one end of both the first guide rail 22 and the second guide rail 25, the motors can be controlled to synchronously drive the sliding of the first slider 23 and the second slider 26, making the movement of the first connecting rod 21 more stable.

[0073] In specific implementation, by setting a motor, the user can directly use the motor to drive the first slider 23 to slide in the first guide rail 22, and then realize the movement of the first connecting rod 21 through the sliding of the first slider 23. In this embodiment, the motor specifically adopts the form of a servo motor and realizes the sliding of the aforementioned first slider 23 through a reciprocating pushing method. However, those skilled in the art should also be able to think that other forms of motors or drive modules can be adopted according to actual needs, such as using a hydraulic drive module or a pneumatic module, etc. This embodiment does not limit this. As Figure 2 and 4 shown, the first connecting rod 21 penetrates through the flow guiding plate 11, and the flow guiding plate 11 is fixedly connected to the middle section of the first connecting rod 21. The linkage unit 20 further includes:

[0074] A second guide rail 25, the second guide rail 25 is arranged on the other side of the air inlet area 1001 relative to the first guide rail 22, and the two ends of the first connecting rod 21 are respectively connected to the first guide rail 22 and the second guide rail 25.

[0075] In specific implementation, by setting the second guide rail 25 relative to the first guide rail 22 and connecting the two ends of the first connecting rod 21 to the first guide rail 22 and the second guide rail 25 respectively after the first connecting rod 21 penetrates through the flow guiding plate 11, it is realized that the first guide rail 22 and the second guide rail 25 simultaneously serve as the benchmarks that can be utilized for the movement of the first connecting rod 21 at both ends of the first connecting rod 21. At this time, the first connecting rod 21 obtains the bilateral stability brought by the first guide rail 22 and the second guide rail 25, and further makes the movement process more stable.

[0076] Not shown in the figure, the flow guiding device 200 further includes: a plurality of sensors respectively disposed at different designated positions in the air inlet area 1001, the plurality of sensors being configured to detect the flue gas concentration value in the air inlet area 1001; a controller configured to be electrically connected to the plurality of sensors to receive the flue gas concentration signal, and configured to be electrically connected to the first motor 24 and the second motor, so as to start the first motor 24 and / or the second motor to move the deflector 11 after receiving the flue gas concentration signal.

[0077] In a specific implementation, by providing the sensors and the controller, the flow guiding device 200 can monitor the flue gas concentration values at different positions in the air inlet area 1001 of the range hood 1000, detect the flue gas concentration value in real time, and further know which specific position urgently needs to improve the air intake efficiency and enhance the oil fume suction effect. Accordingly, the deflector 11 is accurately moved away from the specific position, and more air flow is directed to the specific position by means of blocking and deflecting, so as to achieve the foregoing purpose. For the purpose of illustration, when a rectangular air inlet area 1001 is adopted, those skilled in the art can adopt a setting mode of arranging sensors at the four corners of the rectangular air inlet area 1001. At this time, it can be imagined that the rectangular air inlet area 1001 can be further divided into four quadrants of the same size, namely the first quadrant, the second quadrant, the third quadrant and the fourth quadrant, and each quadrant corresponds to a sensor. As a specific example of moving the deflector 11 in this setting mode, if the flue gas concentration value in the first quadrant is too high, the deflector 11 is moved to the position of the third quadrant, blocking the air flow in the third quadrant and directing the air flow to other quadrants, especially the first quadrant, so as to improve the air intake efficiency and enhance the oil fume suction effect in the first quadrant. Or, if the flue gas concentration value in the second quadrant is too high, the deflector 11 is moved to the position of the fourth quadrant, blocking the air flow in the fourth quadrant and directing the air flow to other quadrants, especially the second quadrant, so as to improve the air intake efficiency and enhance the oil fume suction effect in the second quadrant.

[0078] As Figure 2 As shown, the flow guiding device 200 includes two sets of linkage units 20, the two sets of linkage units 20 are arranged at an angle of 90 degrees to each other, and the deflector 11 moves within a rectangular range. One set of linkage units 20 is arranged between the midpoint positions of the upper edge and the lower edge of the rectangular range, and the other set of linkage units 20 is arranged between the midpoint positions of the left edge and the right edge of the rectangular range.

[0079] In a specific implementation, by arranging the two sets of linkage units 20 at an angle of 90 degrees to each other, the deflector 11 can move along both the width direction and the length direction of the rectangular range, providing another degree of freedom for the displacement again.

[0080] As Figure 1 shown, this embodiment further provides an oil fume extractor 1000, and the oil fume extractor 1000 includes the flow guiding device 200 of any one of the foregoing.

[0081] In specific implementation, by providing the above-mentioned flow guiding device 200, the oil fume extractor 1000 can effectively improve the oil fume extraction effect while reducing the generated noise.

[0082] As Figure 1 、 5 shown in FIGS. 6 and 7, the oil fume extractor 1000 includes a fan 100. The fan 100 includes a front disk 101 facing the air inlet area 1001 and a rear disk 102 away from the air inlet area 1001. The flow guiding plate 11 moves vertically in the air inlet area 1001 in the air inlet direction of the oil fume extractor 1000. At least part of the flow guiding plate 11 protrudes towards the outside of the oil fume extractor 1000, and a chamber filled with sound-absorbing material 30 is formed inside the flow guiding plate 11. The flow guiding plate 11 guides the air flow to the front disk 101. On the basis of conforming to the common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0083] In specific implementation, at least part of the flow guiding plate 11 protrudes towards the outside of the oil fume extractor 1000, and the protrusion is used to further guide the air flow. Thus, when the air flow impacts the flow guiding plate 11, the air flow can flow through the protruding flow guiding plate 11 and go to the front disk 101 of the fan 100 facing the air inlet area 1001, so as to improve the utilization efficiency of the front disk 101 of the fan 100 and further improve the oil fume extraction effect. On the basis of the foregoing, a chamber filled with sound-absorbing material 30 is formed inside the flow guiding plate 11, so as to further achieve noise reduction by using the sound-absorbing material 30. In this embodiment, the optional materials of the flow guiding plate 11 are plastics or metals, etc. The optional materials of the sound-absorbing cotton are pp / pet two-component or polyurethane materials. The optional materials of the slide rail and the slider are materials with wear-resistant characteristics, such as rubber and graphite, etc. This embodiment does not make any limitations in this regard.

[0084] Although the specific implementation manners of the present invention have been described above, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these implementation manners, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A flow guide device, which is used to be arranged in the air inlet area of ​​a range hood, and comprises a flow guide plate, characterized in that: The flow guiding device further comprises: A linkage unit is connected to the guide plate and can drive the guide plate to move within the air inlet area.

2. The flow guiding device according to claim 1, characterized in that: The linkage unit comprises: A first connecting rod is telescopically connected to the guide plate.

3. The flow guiding device according to claim 2, characterized in that The linkage unit also includes: A first guide rail is arranged at one side of the air inlet area, and an end of the first connecting rod away from the guide plate is slidably connected to the first guide rail.

4. The flow guiding device according to claim 3, characterized in that: A motor is disposed at one end of the first guide rail, a first slider connected to the first connecting rod is disposed in the first guide rail, and the motor is connected to the first slider and drives the first slider to slide to a designated position in the first guide rail.

5. The flow guiding device according to claim 3, characterized in that: The first connecting rod passes through the guide plate, and the guide plate is fixedly connected to the middle section of the first connecting rod. The linkage unit also includes: a second guide rail, which is arranged on the other side of the air inlet area relative to the first guide rail, and the two ends of the first connecting rod are respectively connected to the first guide rail and the second guide rail.

6. The flow guiding device according to claim 5, characterized in that: A motor is provided at one end of the first guide rail, a first slider connected to the first connecting rod is provided in the first guide rail, the motor is connected to the first slider and drives the first slider to slide to a specified position in the first guide rail; and / or a second motor is provided at one end of the second guide rail, a second slider connected to the first connecting rod is provided in the second guide rail, the second motor is connected to the second slider and drives the second slider to slide to a specified position in the second guide rail.

7. The flow guiding device according to claim 6, characterized in that: The guide device also includes: a plurality of sensors, which are respectively arranged at different designated positions in the air inlet area, and are used to detect the smoke concentration value in the air inlet area; a controller, which is used to be electrically connected to the plurality of sensors to receive smoke concentration signals, and is used to be electrically connected to the motor and the second motor to start the motor and / or the second motor after receiving the smoke concentration signal to move the guide plate.

8. The flow guiding device according to claim 6, characterized in that: The guide device includes two sets of linkage units, which are arranged at an angle to each other. The guide plate moves within a rectangular range, one set of linkage units is arranged between the upper edge and the lower edge of the rectangular range, and the other set of linkage units is arranged between the left edge and the right edge of the rectangular range.

9. A range hood, characterized in that: The range hood comprises a flow guide device as claimed in any one of claims 1 to 8.

10. The range hood according to claim 9, characterized in that: The range hood includes a fan, which includes a front disk facing the air inlet area and a rear disk away from the air inlet area. The guide plate moves vertically to the air inlet direction of the range hood within the air inlet area. The guide plate at least partially protrudes toward the outside of the range hood, and a chamber filled with sound-absorbing material is formed inside the guide plate. The guide plate guides the airflow to the front disk.

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