Lifting type range hood

Abstract

A lifting type range hood comprises an upper box body and a lower box body, the lower box body is arranged on the upper box body and can do lifting motion relative to the upper box body, a draught fan is installed in the upper box body, the lower box body is provided with a smoke inlet, the central axis L of an impeller of the draught fan is completely located in a vertical plane S, and the vertical plane S is perpendicular to the plane where the smoke inlet is located. The intersection point of the vertical plane S and the upper edge of the smoke inlet is B, the intersection point of the central axis of the impeller and the plane M where the volute cover plate located on the main air inlet side of the draught fan is located is A, the slope of the connecting line from the point A to the point B is k1 in the state that the lower box body rises to the highest position, the slope of the connecting line from the point A to the point B is k2 in the state that the lower box body descends to the lowest position, and k1-k2 is larger than or equal to 0.8. According to the lifting type range hood, the lifting stroke is limited in a certain range through limitation of two slope difference range values, so that the range hood has enough descending stroke and negative pressure area downward movement to ensure the oil smoke suction effect, and also has enough ascending stroke to ensure that the size of the whole range hood is relatively small.

Description

[0001] The application is a divisional application, the original application date is July 26, 2024, the original application number is 202421794831.6, and the original application invention name is: lifting type range hood TECHNICAL FIELD

[0002] The utility model relates to range hood technical field, especially is a lifting type range hood. BACKGROUND

[0003] The range hood has become one of the indispensable equipment in modern family kitchen. With the increasing application rate of the range hood, people pay more and more attention to the oil fume suction effect and installation aesthetics of the range hood. The traditional top suction type range hood is relatively large in size, and the cook is prone to bumping his head. If the distance between the air inlet of the range hood and the oil fume generation area is large, the oil fume suction path is long, and the suction time is increased, which makes it easy to produce oil fume escape phenomenon during cooking. If the installation height of the range hood is lowered and the smoke inlet is as close to the smoke source as possible, the negative pressure is expanded, which is beneficial to improving the oil fume suction effect, but it will cause the cooking space to be too small, and the cook's head is easy to accidentally bump into the smoke collecting cover. Moreover, after the installation height is lowered, the line of sight and the overall appearance of the kitchen are also affected. Therefore, people have invented a lifting type range hood, that is, the smoke inlet can be lifted. When the machine is started, the smoke inlet is lowered, and when the machine is turned off, the smoke inlet is raised. For example, the Chinese utility model patent with the patent number 202222918682.7 (the authorized announcement number is CN 218864291 U) discloses an oil fume extractor. The oil fume extractor includes a smoke collecting cavity, a fan assembly, and a lifting assembly. The fan assembly is arranged inside the smoke collecting cavity, and the lifting assembly is connected with the smoke collecting cavity. The lifting assembly can drive the smoke collecting cavity to lift. When the oil fume extractor is running, the lifting assembly drives the smoke collecting cavity to descend below the cabinet, and the fan assembly starts to suck and exhaust the oil fume. When the oil fume extractor is not running, the lifting assembly drives the smoke collecting cavity to rise into the cabinet, and the fan assembly is turned off. The oil fume extractor discloses a single-stage lifting structure. The whole machine has only one lifting assembly of the smoke collecting cavity. The structure is relatively simple, and the position constraint relationship needs to be considered is limited. If the range hood has a two-stage lifting structure, it is necessary to consider that each lifting assembly has sufficient descending stroke to make the negative pressure area move downward obviously, thereby improving the oil fume suction effect. It is also necessary to consider that each lifting assembly can reduce the height of the whole machine in the raised state, thereby making the structure of the range hood more compact and simple, and realizing hidden installation. Therefore, the position constraint relationship between multiple different lifting assemblies needs to be considered. SUMMARY

[0004] The utility model solves the technical problem of the prior art, and provides a lifting type range hood which has good oil fume suction effect in working state, low height of the whole machine in non-working state, and is easy to hide.

[0005] The utility model discloses a lifting type range hood which comprises an upper box body and a lower box body, the lower box body is arranged on the upper box body, and the lower box body and the upper box body can move up and down relative to each other, a fan is installed in the upper box body, and the lower box body is provided with a smoke inlet, characterized in that: there is a vertical plane S, a middle axis L of an impeller of the fan is completely located in the vertical plane S, the vertical plane S is perpendicular to a horizontal plane, a plane where the smoke inlet is located is also perpendicular to the vertical plane S, an intersection of the vertical plane S and an upper edge of the smoke inlet is point B, an intersection of the middle axis of the impeller and a plane M where a volute cover plate located on a main smoke inlet side of the fan is point A, in a state where the lower box body is lifted to the highest position, a slope of a line connecting point A and point B is k1, in a state where the lower box body is lowered to the lowest position, the slope of the line connecting point A and point B is k2, and |k1-k2| is greater than or equal to 0.8.

[0006] Point A and point B are located on the vertical plane S of the range hood, a rectangular coordinate system is established on the vertical plane S, the plane S passes through the middle axis of the impeller and is parallel to the side plate of the upper box body, point B in a state where the lower box body is lowered is taken as the origin, an X axis and a Y axis are arranged on the vertical plane S, the X axis passes through point B and is parallel to the horizontal plane, the X axis extends from front to back, and the Y axis passes through point B and is perpendicular to the horizontal plane, the Y axis extends from bottom to top. The slope in the application is established on the rectangular coordinate system. The features in the application are features of the range hood in the installed state, and the installed state refers to a state where the range hood is installed on a vertical wall and can be normally used.

[0007] In some embodiments, |k1-k2| is greater than or equal to 1, 2, 3, 4 or 5. In the range hood that moves up and down in the vertical direction only, the positive and negative of the slope of the line connecting point A and point B do not change, that is, in a state where the lower box body is lifted to the highest position, when the slope k1 of the line connecting point A and point B is positive, in a state where the lower box body is lowered to the lowest position, the slope k2 of the line connecting point A and point B is also positive, and vice versa.

[0008] The line connecting point A and point B has a slope, so the line must be inclined to the horizontal plane, that is, point A and point B have a certain distance in the front-back direction. Point A is located at the center of the fan inlet, and point B is located at the edge of the smoke inlet where the oil fume first enters the range hood. The oil fume is sucked into the range hood through the flow channel and enters the fan inlet, and then is discharged. Therefore, the smaller the distance between point A and point B in the front-back direction, the better the straight suction and straight discharge effect can be achieved, that is, the larger the k2 value, the more conducive to straight suction and straight discharge, and the larger the k2 value indicates that the distance between point A and point B in the vertical direction is farther, so that the negative pressure area of the range hood can be lowered, and the oil fume can be sucked into the smoke inlet as soon as it is generated. In the present scheme, the lower box body can be raised upward in the non-working state of the fan, and the upper box body can be accommodated in the lower box body after the lower box body is raised, which is more beautiful and reduces the size of the whole machine, and the kitchen space is larger. The smaller the k1 value, the closer point A and point B are, and therefore the smaller the size of the whole machine. However, the k1 value also needs a lower limit value to ensure that point A and point B maintain a certain distance in the vertical direction, that is, to ensure that the fan and the lower box body maintain a certain interval in the vertical direction. When the slope k value is less than 1, the angle between the straight line and the horizontal plane is less than 45°, and when the line connecting point A and point B is arbitrarily changed within the range of an angle less than 45° with the horizontal plane, the absolute value difference of the slope of any two lines must be less than 1. At this time, since point A and point B are spaced apart in the front-back direction, the straight suction and straight discharge effect cannot be achieved. Therefore, when |k1-k2|≥0.8, the range hood can have the effects of straight suction, straight discharge, and lowering of the negative pressure area in the lowered state, and the effects of reducing the size of the whole machine and smoothly guiding oil fume in the raised state, that is, the larger the difference, the greater the movement stroke of the lower box body, and the better the effects of lowering the negative pressure area and reducing the size of the range hood in the raised state.

[0009] In order to ensure the effect of smoke suction and discharge and achieve the effect of straight suction and straight discharge, the horizontal distance between point A and point B should be as small as possible. In the extreme case, the horizontal distance between point A and point B is at most 90 mm, and the minimum height change value before and after lifting of the lifting type range hood under the standard of meeting the technical feasibility is 70 mm. In this case, the slope difference of the line connecting point A and point B before and after lifting, that is, |k1-k2|=70 / 90≈0.8. Therefore, in order to achieve the effect of straight suction and straight discharge, the horizontal distance between point A and point B should be smaller, or the height change value before and after lifting should be larger to achieve the effects of concealment in the raised state and low negative pressure area in the lowered state. Therefore, |k1-k2|≥0.8 should be met.

[0010] When k is greater than 0, it means that in the front-rear direction, point B is in front of point A. When the range hood is lowered to the lowest position, |k| needs to have a lower limit value. When |k| exceeds the lower limit value, it can be ensured that the lower cabinet will not have too much width in the front-rear direction, thereby causing the pot blocking problem, and the lower cabinet will not have too small width in the front-rear direction, thereby causing the air inlet channel to be too narrow and affecting the oil fume suction effect. When the distance between point A and point B in the front-rear direction is smaller, |k| tends to infinity, so |k| has no upper limit value, and |k1-k2| also has no upper limit value.

[0011] Preferably, in the state that the lower cabinet is raised to the highest position, the upper cabinet is at least partially accommodated in the lower cabinet, and the slope k1 of the line connecting point A to point B satisfies |k1|≥a, and a can be 4, 10, 20, 40, 80 or 100, preferably a is 4. In this way, the maximum lifting stroke of the lower cabinet can be limited to avoid interference with the fan.

[0012] Further preferably, in the state that the lower cabinet is lowered to the lowest position, the slope k2 of the line connecting point A to point B satisfies |k2|≥b, and b can be 7, 15, 30, 50 or 100, preferably b is 7. By setting the minimum value of the slope k2, it can be ensured that the position deviation between the main air inlet of the fan and the smoke inlet in the front-rear direction will not be too large, achieving the straight suction and straight exhaust effect.

[0013] In order to receive the oil liquid dripping from the fan, a first plate body is installed below the fan, and the first plate body at least includes a transverse portion which is inclined downward from front to back. In this way, on the one hand, it can ensure that the oil liquid can flow from front to back to concentrate the oil liquid into the oil path at the rear of the cabinet and finally into the oil cup, and on the other hand, the inclined transverse portion has a flow guiding effect, so that the oil fume can smoothly enter the fan.

[0014] Further preferably, the upper cabinet has an upper cabinet front plate, the lower cabinet has a lower cabinet front plate, and the vertical distance d from point A to the outer surface of the upper cabinet front plate and the vertical distance e from point A to the inner surface of the lower cabinet front plate satisfy 0.7≤d / e<1, preferably, d / e can be 0.8, 0.98. In this way, the lower cabinet is closer to the user, and the user has a stronger perception of the vibration of the lower cabinet. The fan is installed in the upper cabinet, and the airflow disturbance caused by the rotation of the fan will affect the nearby structure, and a strong pressure difference will be generated at the fan air inlet. The cabinet front plate is directly opposite the fan air inlet, and the front plate is usually a large-area thin plate, so it is easy to vibrate and produce noise. When the vertical distance from point A to the outer surface of the upper cabinet front plate is less than the vertical distance from point A to the inner surface of the lower cabinet, the lifting cabinet is in the form of the lower cabinet wrapping the upper cabinet. The upper cabinet is directly contacted by the airflow at the fan air inlet, and the vibration degree of the lower cabinet is less than that of the upper cabinet. The lower cabinet is closer to the user, so the user's perception of the cabinet vibration and noise is reduced.

[0015] Further preferably, there is a gap between the upper cabinet front plate and the lower cabinet front plate. The minimum distance from point A to the upper edge of the lower cabinet front plate is a, and the minimum distance from point A to the lower edge of the upper cabinet front plate is b, which satisfy 0.2≤a / b≤0.9. In this way, the transmission path of the fan center noise can be increased, and because the cabinet structure is in the form of the lower cabinet wrapping the upper cabinet, part of the noise transmitted from the cabinet gap will be transmitted from the upper edge of the lower cabinet, which is farther away from the human ear, so the user's perception of the noise can be reduced. When the lower cabinet wraps the upper cabinet, the noise transmission path generated by the fan center is from the fan center point to the lower edge of the upper cabinet front plate, then through the gap between the upper cabinet front plate and the lower cabinet front plate, and finally from the upper edge of the lower cabinet front plate. If the cabinet lifting form is the upper cabinet wrapping the lower cabinet, the noise transmission path generated by the fan center is from the fan center point to the upper edge of the lower cabinet front plate, then through the gap between the upper cabinet front plate and the lower cabinet front plate, and finally from the lower edge of the upper cabinet. The former transmission path has more noise attenuation, so it has a better noise reduction effect.

[0016] Further preferably, in the state that the lower cabinet is lifted to the highest position, the horizontal plane where the highest point of the lower cabinet is located is N, the fan is at least partially located in the lower cabinet, and the vertical distance h between point A and the horizontal plane N satisfies h≤120mm. In this way, the upper limit of h is defined to ensure that the fan center point is as close to the lower cabinet as possible, so that the lower cabinet at least wraps part of the fan, reducing the overall size of the machine.

[0017] The application discloses a lifting type range hood, which comprises an upper box body and a lower box body, the lower box body is arranged on the upper box body and can move up and down relative to the upper box body, a fan is arranged in the upper box body, and the lower box body is provided with a smoke inlet, wherein a middle axis L of an impeller of the fan is located in a vertical plane S, the vertical plane S is perpendicular to a plane where the smoke inlet is located, an intersection point of the vertical plane S and an upper edge of the smoke inlet is B, an intersection point of the middle axis of the impeller and a plane M where a volute cover plate of a front air inlet of the fan is located is A', a first plate body is arranged below the fan, the first plate body is provided with a transverse part extending in a front-rear direction, the transverse part of the first plate body has a highest point C at a frontmost end and a lowest point D at a rearmost end on the vertical plane S, and in a state that the lower box body is lowered to a lowest position, a line connecting the point A' to the point B gradually inclines downward from front to back with a slope k2', and a line connecting the point C to the point D gradually inclines downward from front to back with a slope k3, and the following condition is met: |k2'-k3|≤50.

[0018] The front direction of the application is a direction close to a user in a normal use state of the range hood arranged on a vertical wall, and the rear direction is a direction away from the user in the same state. In this way, the line connecting the smoke inlet to the air inlet of the fan and the first plate body are arranged to be inclined in the same direction, the first plate body needs to be inclined at a certain angle so as to guide the oil fume, that is, after the oil fume hits the first plate body, the oil fume is guided into the air inlet of the fan due to the wall attachment effect caused by the inclination of the plate body, the slope k3 of the inclination of the first plate body needs to reach a certain minimum value so as to achieve the guiding effect, and the difference between k3 and k2' is not more than 50, so that the flow direction of the oil fume does not change suddenly, thereby making the oil fume path more smooth.

[0019] Further preferably, the first plate body comprises at least the transverse part, the transverse part is arranged to be inclined downward from front to back, and the slope k3 satisfies the following condition: 0.01≤|k3|≤0.75. In this way, the inclination degree of the first plate body can be kept in a proper range, the guiding effect of the first plate body is not affected due to the too small slope, and the vertical height of the first plate body is not too high due to the too large slope, thereby facilitating the reduction of the overall height of the range hood in the raised state of the lower box body.

[0020] Further preferably, the upper cabinet has an upper cabinet front plate, the lower cabinet has a lower cabinet front plate, and the vertical distance d' from point A' to the outer surface of the upper cabinet front plate and the vertical distance e' from point A' to the inner surface of the lower cabinet front plate satisfy the condition: 0.7≤d / e<1, preferably, the value of d / e can be 0.8, 0.98. In this way, the lower cabinet is closer to the user, and the user has a stronger perception of the vibration of the lower cabinet. The fan is installed in the upper cabinet, and the airflow disturbance caused by the rotation of the fan will affect the nearby structure, and a strong pressure difference will be generated at the fan air inlet. The cabinet front plate is directly opposite the fan air inlet, and the front plate is usually a large-area thin plate, so it is easy to vibrate and produce noise. When the vertical distance from point A' to the outer surface of the upper cabinet front plate is less than the vertical distance from point A' to the inner surface of the lower cabinet, the lifting cabinet is in the form of the lower cabinet wrapping the upper cabinet. The upper cabinet is directly contacted by the airflow at the fan air inlet, and the vibration degree of the lower cabinet is less than that of the upper cabinet. The lower cabinet is closer to the user, so the user's perception of the cabinet vibration and noise is reduced.

[0021] Further preferably, there is a gap between the upper cabinet front plate and the lower cabinet front plate. The minimum distance from point A to the upper edge of the lower cabinet front plate is a, and the minimum distance from point A to the lower edge of the upper cabinet front plate is b, which satisfy the condition: 0.2≤a / b≤0.9. In this way, the transmission path of the fan center noise can be increased, and because the cabinet structure is in the form of the lower cabinet wrapping the upper cabinet, part of the noise transmitted from the cabinet gap will be transmitted from the upper edge of the lower cabinet, which is farther away from the human ear, so the user's perception of the noise can be reduced. When the lower cabinet wraps the upper cabinet, the noise transmission path generated by the fan center is from the fan center point to the lower edge of the upper cabinet front plate, then through the gap between the upper cabinet front plate and the lower cabinet front plate, and finally from the upper edge of the lower cabinet front plate. If the cabinet lifting form is the upper cabinet wrapping the lower cabinet, the noise transmission path generated by the fan center is from the fan center point to the upper edge of the lower cabinet front plate, then through the gap between the upper cabinet front plate and the lower cabinet front plate, and finally from the lower edge of the upper cabinet. The noise attenuation of the former transmission path is more, so it has a better noise reduction effect.

[0022] Further preferably, in the state that the lower cabinet is lifted to the highest position, the horizontal plane where the highest point of the lower cabinet is located is N, the fan is at least partially located in the lower cabinet, and the vertical distance h between point A' and the horizontal plane N satisfies the condition: h≤120mm. In this way, the upper limit of h is defined to ensure that the fan center point is as close to the lower cabinet as possible, so that the lower cabinet at least wraps part of the fan, reducing the overall size of the machine.

[0023] Further preferably, the lower box is provided with a grid-shaped oil screen, the oil screen is arranged at the smoke inlet, the oil screen has ribs distributed at intervals in the left-right direction, the ribs extend in the front-rear direction, and the width of the ribs in the middle region is greater than the width of the ribs in the left and right side regions. In the projection along the direction perpendicular to the horizontal plane, the projection of the ribs in the middle region overlaps with the projection of the first plate body, in the overlapping part, the maximum width of the ribs in the middle region is L1, and along the same projection direction, the width of the first plate body corresponding to the maximum width L1 is L2, and L1 / L2≤2 / 5 is satisfied. In this way, on the one hand, the oil screen has a certain structural strength, and on the other hand, the oil screen with different rib widths can also distribute the flow, because the oil fume first passes through the ribs and then reaches the first plate body, the first plate body changes the path of the oil fume and guides it into the fan, therefore, the ribs in the middle region should not be too wide, otherwise too much oil fume reaching the first plate body will be blocked, thereby reducing the flow guiding effect, when L1 / L2≤2 / 5, the ribs in the middle region can not only play a supporting effect, but also reduce the blocking of the oil fume, thereby ensuring the flow guiding effect of the first plate body.

[0024] Further preferably, the lower box is provided with a grid-shaped oil screen, the oil screen is arranged below the first plate body, the oil screen has ribs distributed at intervals in the left-right direction, and the transverse part of the first plate body is formed with a concave profile structure, and the width of the ribs corresponding to the profile structure is greater than the width of the ribs corresponding to the regions outside the profile structure. In this way, the oil liquid received in the profile structure can flow into the oil cup through the ribs with a wider width, i.e. the oil guiding channel, the oil liquid can be orderly concentrated and guided downward into the oil cup, thereby improving the cleanliness and oil discharge efficiency of the entire machine.

[0025] In order to cooperate the oil screen with the smoke inlet, the smoke inlet is arranged obliquely downward from front to back, and the oil screen is arranged obliquely downward from front to back at the smoke inlet.

[0026] In order to make the air inlet amount of the front air inlet greater than the air inlet amount of the rear air inlet, the upper box has an upper box front plate and an upper box rear plate, and the distance between the lowest point of the front side bottom of the fan and the upper box front plate is greater than the distance between the lowest point of the rear side bottom of the fan and the upper box rear plate.

[0027] In order to drive the lower box to move up and down, the lower box moves up and down relative to the upper box under the drive of the driving mechanism.

[0028] Compared with the prior art, the advantages of the utility model lie in: the lower box body of the lifting type range hood makes lifting movement relative to the upper box body, because the position of the fan is invariable, the slope of the lower box body at the A and B points set in the lifting process changes, the lifting stroke of the lower box body is limited in a certain range by limiting the range value of the difference between the two slopes when lifting to the highest position and lowering to the lowest position, the range hood can have enough lifting stroke and enough lowering stroke, the negative pressure area moves downward to ensure the oil fume suction effect, the whole machine volume is small, the whole machine can be hidden in the kitchen cabinet, the appearance is high, the lower limit value of the slope difference indicates that the deviation of the smoke inlet and the fan air inlet in the vertical direction is not too large, and the straight suction and straight discharge effect is ensured. On the other hand, from the oil fume path, the first plate body is arranged downstream of the smoke inlet, the first plate body is inclined downward from front to back, the oil dirt in the fan can be guided to the rear of the box body and then guided into the oil cup, and the inclination direction of the first plate body is consistent with the inclination direction of the A (A') and B two point connection lines, so that the oil fume enters the box body in the direction of the smoke inlet, then collides with the first plate body, and then the oil fume path smoothly enters the main air inlet of the fan due to the same inclination of the guide plate first plate body, and the oil fume generates the wall attachment effect on the lower surface of the first plate body and is guided. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structure schematic view of the range hood of the utility model embodiment (non-working state);

[0030] Figure 2 It is a structure schematic view of the range hood of the utility model embodiment (non-working state); Figure 1 It is a front view of the range hood shown in the figure;

[0031] Figure 3 It is a structure schematic view of the range hood of the utility model embodiment (non-working state); Figure 2 It is a front view of the range hood shown in the figure;

[0032] Figure 4 It is a structure schematic view of the range hood of the utility model embodiment (non-working state);

[0033] Figure 5 It is a structure schematic view of the range hood of the utility model embodiment (non-working state); Figure 4 It is a front view of the range hood shown in the figure;

[0034] Figure 6 It is a structure schematic view of the range hood of the utility model embodiment (non-working state); Figure 4 It is a front view of the range hood shown in the figure;

[0035] Figure 7 It is a structure schematic view of the range hood of the utility model embodiment (non-working state); Figure 5 It is a front view of the range hood shown in the figure;

[0036] Figure 8 It is a structure schematic view of the range hood of the utility model embodiment (non-working state); Figure 1 It is a structure schematic view of the range hood of the utility model embodiment (non-working state); DETAILED DESCRIPTION

[0037] The utility model will be described in further detail below in combination with the drawings.

[0038] It is particularly pointed out that the schemes in the application are realized in the installation state of the range hood, and the installation state is that the range hood is installed along a plumb surface perpendicular to a horizontal plane, that is, the back plate of the range hood is parallel to a vertical surface.

[0039] As shown in Figures 1 to 7 , the lifting range hood of the embodiment comprises an upper box body 1, a lower box body 2, and an air inlet body 7. The lower box body 2 is arranged on the upper box body 1 and can move up and down relative to the upper box body 1, and the air inlet body 7 is arranged on the lower box body 2 and can move up and down relative to the lower box body 2, that is, a two-stage lifting structure is realized. The lower box body 2 and the air inlet body 7 can move synchronously under the driving of a set of driving mechanisms, or can move individually under the driving of independent driving mechanisms.

[0040] The top of the air inlet body 7 is open, and the front surface of the air inlet body 7 is provided with a smoke inlet 71. The smoke inlet 71 can be perpendicular to the horizontal plane or can be inclined at a certain angle relative to the horizontal plane. A fan 3 is installed in the upper box body 1, and the smoke inlet 71 is connected in communication with the air inlet of the fan 3 through an air inlet channel in the range hood. Oil fume is sucked into the smoke inlet 71, enters the air inlet channel through the open top, and is then discharged outward by the fan 3. In the state that the lower box body 2 and the air inlet body 7 are lifted, the bottom of the fan 3 at least partially enters the lower box body 2, and the air inlet body 7 at least partially enters the lower box body 2. As shown in Figures 1 to 3 , in the state that the lower box body 2 and the air inlet body 7 are lifted to the highest position, the smoke inlet 71 is entirely hidden inside the lower box body 2. As shown in Figures 4 to 7 , in the state that the lower box body 2 and the air inlet body 7 are lowered to the lowest position, the smoke inlet 71 is entirely exposed below the lower box body 2.

[0041] As shown by an arrow H in Figure 3 , the direction is rearward. The fan 3 of the embodiment is a vertically arranged centrifugal fan, and the central axis L of the impeller is perpendicular to the front plate 11 of the upper box body. The fan 3 adopts a front and rear air inlet structure, that is, the fan 3 has a rear air inlet 32 and a front air inlet 31. The rear air inlet 32 is a main air inlet, and the front air inlet 31 is an auxiliary air inlet. The vertical direction here is not only limited to being perpendicular to the horizontal plane, but can also be inclined at a certain angle relative to the vertical direction.

[0042] As shown in Figure 6 , a vertical plane S is set, the central axis L of the impeller of the fan 3 passes through the vertical plane S, and the vertical plane S is perpendicular to the plane on which the smoke inlet 71 is located. As shown in Figure 3 and Figure 7As shown, the intersection of the vertical plane S and the upper edge of the smoke inlet 71 is B, and the intersection of the impeller central axis L and the plane M where the volute cover plate 43 located on the side of the main air inlet of the fan is A. Here, the upper edge of the smoke inlet 71 refers to the lower edge of the upper baffle 9 above the smoke inlet 71. As shown in the figure, Figure 3 As shown, in the state that the lower cabinet 2 and the air inlet body 7 are raised to the highest position, the slope of the line from point A to point B is k1, as shown in the figure, Figure 7 As shown, in the state that the lower cabinet 2 and the air inlet body 7 are lowered to the lowest position, the slope of the line from point A to point B is k2, and |k1-k2|≥0.8 is satisfied. In some embodiments, |k1-k2|≥1, 2, 3, 4 or 5. By limiting the range value of the difference between the two slopes in the state of being raised to the highest position and the state of being lowered to the lowest position, the lifting stroke of the lower cabinet 2 and the air inlet body 7 can be limited within a certain range, so that the range hood can have sufficient lowering stroke and negative pressure zone downward movement to ensure the oil fume extraction effect, and also have sufficient raising stroke to ensure that the overall size of the range hood is small, which is beneficial to hide the range hood in the kitchen cabinet, and the aesthetic degree is high. The upper limit value of the slope difference indicates that the deviation between the smoke inlet 21 of the air inlet body 7 and the main air inlet of the fan in the vertical direction should not be too large, which ensures the straight suction and straight exhaust effect.

[0043] As shown in the figure, Figure 3 As shown, the horizontal plane where the highest point of the lower cabinet 2 is located is plane N, the projection of point B on plane N in the vertical direction is B1, and the projection of point A on plane N in the vertical direction is A1. The vertical distance from point B1 to the top edge of the lower cabinet front plate 21 is less than the vertical distance from point A1 to the top edge of the lower cabinet front plate 21, that is, B1 is located on the front side of A1. In this way, the air inlet body 7 must be located below the fan 3 in the raised state, which is beneficial to guide the oil stains in the fan 3 into the air inlet body 7, and then into the oil cup 6 at the bottom of the air inlet body 7.

[0044] In this embodiment, the first air inlet channel 81 is formed in the air inlet body 7, the fourth air inlet channel 84 is formed between the rear air inlet 32 of the fan 3 and the upper cabinet rear plate 12, and the depth of the first air inlet channel 81 is greater than the depth of the fourth air inlet channel 84. Here, the depth refers to the front-to-back width of the channel. The greater depth of the first air inlet channel 81 than the fourth air inlet channel 84 can ensure the straight suction and straight exhaust effect and make the oil guiding more smooth. Moreover, the projection of the first air inlet channel 81 on plane N in the vertical direction overlaps with the projection of the fourth air inlet channel 84 on plane N in the vertical direction, and the overlapping area is more than 80% of the projection area of the first air inlet channel 81 on plane N in the vertical direction. Therefore, the straight suction and straight exhaust effect can be further ensured, and the oil fume extraction effect can be improved. The back plate in this application is perpendicular to the horizontal plane.

[0045] The lower cabinet 2 of the embodiment comprises a lower cabinet front plate 21, a left side plate (not shown in the figure), a right side plate (not shown in the figure), and a lower cabinet rear plate 23. The second air inlet channel 82 and the third air inlet channel 83 are formed inside the lower cabinet 2, and the smoke inlet 31 is in fluid communication with the fan air inlet through the second air inlet channel 82 and the third air inlet channel 83. Specifically, the third air inlet channel 83 is open at the top and is in fluid communication with the upper cabinet 1. The third air inlet channel 83 is open at the bottom near the lower cabinet rear plate 22, and the opening extends downward to form the second air inlet channel 82, which is in fluid communication with the air inlet body 7 and the third air inlet channel 83. In this way, the air inlet channel inside the lower cabinet 2 is a channel that is wide at the top and narrow at the bottom. The narrow second air inlet channel 82 facilitates the rapid suction of oil fumes, improving the oil fume suction effect. The wide third air inlet channel 83 can act as a pressure stabilizing chamber, reducing oil fume escape and noise. In the embodiment, the width W2 of the third air inlet channel 83 in the front-to-back direction and the width W1 of the second air inlet channel 82 in the front-to-back direction satisfy: W2≥1.5W1. In this way, the structure of the third air inlet channel 83 and the second air inlet channel 82 forms a variable cross-section air inlet channel, which can effectively block the direct transmission of noise generated by the fan 3 to the outside. Through the simulation of the principle of resistance sound absorption, the sound waves emitted from the fan 3 are reflected multiple times inside the wide upper cavity, thereby being canceled out. Therefore, a variable cross-section acoustic impedance is constructed, and the energy of the sound propagating from the fan air inlet to the range hood air inlet is reduced. In addition, the construction of the airflow buffer cavity simulates a static pressure tank, which can improve the separation of non-steady flow caused by inlet distortion, thereby reducing pressure pulsation and improving sound quality.

[0046] In addition, as shown in Figure 3 the lower cabinet 2 is lowered to the lowest position, the fan 3 is located above the third air inlet channel 83, and the air inlet body 7 extends downward from the bottom of the lower cabinet 2. When the lower cabinet 2 is raised to the highest position, the fan 3 at least partially extends into the third air inlet channel 83, and the air inlet part of the air inlet body 7 at least partially extends into the second air inlet channel 82. Therefore, the air inlet channel of the lower cabinet 2 has the functions of accelerating flow speed, stabilizing pressure, and reducing noise in the oil fume suction state. In the raised state, the air inlet body and the fan are accommodated respectively, reducing the space occupation.

[0047] As shown in Figure 8As shown, the grid plate 5 of the embodiment has the ribs 51 distributed in the left-right direction, the ribs 51 extend in the front-rear direction, the ribs 51 constitute the oil guiding channels, and the width of the ribs 51 in the middle region is greater than the width of the ribs 51 in the left and right side regions. The transverse portion of the first plate body 4 is formed with the concave embossed structure 41, and the width of the ribs 51 corresponding to the embossed structure 41 is greater than the width of the ribs 51 corresponding to the region outside the embossed structure 41. Since the oil liquid on the first plate body 4 is mainly concentrated in the embossed structure 41, and the middle ribs 51 corresponding to the embossed structure 41 are wider, the oil liquid can smoothly flow into the oil cup 6 through the middle oil guiding channel, avoiding the overflow of the oil liquid from the oil guiding channel, and improving the oil discharge efficiency.

[0048] The remaining structure of the embodiment is the same as that of Embodiment One, and will not be described here.

[0049] In the specification and claims of the present application, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present application, but these terms are used herein only for the purpose of convenient description and are determined based on the example orientation shown in the drawings. Since the embodiments disclosed in the present application can be arranged in different directions, these terms indicating directions are only for illustration and should not be considered as limitations, such as "upper" and "lower" are not necessarily limited to the direction opposite or consistent with the direction of gravity. In addition, in the present embodiment, the definition and structural state of the range hood are referred to in the installed state of the range hood.

[0050] The "fluid communication" referred to in the present application refers to the spatial positional relationship between two components or parts, which are collectively referred to as a first part and a second part, i.e. fluid gas, liquid or mixture of the two can flow or / and be transported from the first part to the second part along the flow path. It can be directly connected between the first part and the second part, or indirectly connected between the first part and the second part through at least one third party, which can be a fluid passage such as a pipe, channel, conduit, flow guide, hole, groove, etc. It can also be a chamber or a combination thereof that allows fluid to flow.

Claims

1. A liftable range hood, comprising an upper housing (1) and a lower housing (2), wherein the lower housing (2) is disposed on the upper housing (1), and the lower housing (2) and the upper housing (1) are capable of relative lifting and lowering movements, a fan (3) is installed inside the upper housing (1), and the lower housing (2) has a smoke inlet (22), characterized in that: There is a vertical plane S, the impeller axis L of the fan (3) is completely located in the vertical plane S, the plane where the smoke inlet (22) is located is perpendicular to the vertical plane S, the intersection of the vertical plane S and the upper edge of the smoke inlet (22) is B, the intersection of the impeller axis and the plane M where the volute cover plate located on the side of the main air inlet of the fan (3) is A, in the state that the lower box (2) rises to the highest position, the slope of the line from point A to point B is k1, in the state that the lower box (2) falls to the lowest position, the slope of the line from point A to point B is k2, and |k1-k2|≥0.8 is satisfied.

2. The lifting type range hood according to claim 1, characterized in that: In the state that the lower box (2) rises to the highest position, the upper box (1) is at least partially accommodated in the lower box (2), and the slope k1 of the line from point A to point B satisfies |k1|≥4.

3. The lifting type range hood according to claim 2, characterized in that: The slope k1 satisfies |k1|≥100.

4. The lifting hood according to claim 1, characterized in that: In the state that the lower box (2) falls to the lowest position, the slope k2 of the line from point A to point B satisfies |k2|≥7.

5. The lifting hood according to claim 4, characterized in that: The slope k2 satisfies |k2|≥100.

6. The lifting hood according to claim 1, characterized in that: A first plate body (4) is installed below the fan (3), and the first plate body (4) at least includes a transverse portion which is obliquely downwardly inclined from front to back.

7. The lifting hood according to any one of claims 1 to 6, characterized in that: The upper box (1) has an upper box front plate (11), the lower box (2) has a lower box front plate (21), and the vertical distance d from point A to the outer surface of the upper box front plate (11) and the vertical distance e from point A to the inner surface of the lower box front plate (21) satisfy 0.7≤d / e<1.

8. The lifting type range hood according to claim 7, wherein a gap is present between the upper cabinet front plate and the lower cabinet front plate. The minimum distance from point A to the upper edge of the lower box front plate is a, and the minimum distance from point A to the lower edge of the upper box front plate is b, and 0.2≤a / b≤0.9 is satisfied.

9. The lifting hood according to any one of claims 1 to 6, characterized in that: In the state that the lower box (2) rises to the highest position, the horizontal plane where the highest point of the lower box (2) is located is N, the fan (3) is at least partially located in the lower box (2), and the vertical distance h between point A and the horizontal plane N satisfies h≤120mm.

10. A lifting type range hood comprising an upper cabinet (1) and a lower cabinet (2), said lower cabinet (2) being provided on the upper cabinet (1) and being capable of lifting and lowering relative to the upper cabinet (1), a fan (3) being installed in the upper cabinet (1), and the lower cabinet (2) having a smoke inlet (22), characterized in that: There is a vertical plane S, the impeller axis L of the fan (3) is completely located in the vertical plane S, the plane where the smoke inlet (22) is located is perpendicular to the vertical plane S, the intersection of the vertical plane S and the upper edge of the smoke inlet (22) is B, the intersection of the impeller axis and the plane M where the volute cover plate located on the front air inlet (31) of the fan (3) is A', a first plate body (4) is installed below the fan (3), the first plate body (4) at least includes a transverse portion extending in the front-back direction, the transverse portion of the first plate body (4) has a highest point C at the most front end and a lowest point D at the most back end on the vertical plane S, in the state that the lower box (2) falls to the lowest position, the line from point A' to point B is gradually downwardly inclined from front to back and the slope is k2', the line from point C to point D is gradually downwardly inclined from front to back and the slope is k3, and |k2'-k3|≤50 is satisfied.

11. The lifting hood according to claim 10, characterized in that: The slopes k2' and k3 satisfy |k2'|>|k3|.

12. The lifting hood according to claim 10, characterized in that: The transverse portion is obliquely downwardly inclined from front to back, and the slope k3 satisfies 0.01≤|k3|≤0.

75.

13. The lifting hood according to claim 10, characterized in that: The upper cabinet (1) has an upper cabinet front plate (11), the lower cabinet (2) has a lower cabinet front plate (21), and the vertical distance d' from point A' to the outer surface of the upper cabinet front plate (11) and the vertical distance e' from point A' to the inner surface of the lower cabinet front plate (21) satisfy: 0.7≤d' / e'<1.

14. The lifting type range hood according to claim 13, wherein a gap is present between the upper cabinet front plate and the lower cabinet front plate. The minimum distance of point A' to the upper edge of the lower cabinet front plate is a', and the minimum distance of point A' to the lower edge of the upper cabinet front plate is b', and 0.2≤a' / b'≤0.9 is satisfied.

15. The lifting hood according to claim 10, characterized in that: In the state that the lower cabinet (2) is raised to the highest position, the horizontal plane where the highest point of the lower cabinet (2) is located is N, the fan (3) is at least partially located in the lower cabinet (2), and the vertical distance h between point A' and the horizontal plane N satisfies: h≤120mm.

16. The lifting hood according to claim 1 or 10, characterized in that: The lower cabinet (2) is provided with a grid-shaped oil screen (5), the oil screen (5) is arranged above the smoke inlet (22), the oil screen (5) has ribs (51) spaced apart along the left-right direction, the ribs (51) extend along the front-rear direction, and the width of the ribs (51) in the middle region is greater than the width of the ribs (51) in the left and right side regions.

17. The lifting hood according to claim 6 or 10, characterized in that: The lower cabinet (2) is provided with a grid-shaped oil screen (5), the oil screen (5) is arranged below the first plate body (4), the oil screen (5) has ribs (51) spaced apart in the left-right direction, and the transverse portion of the first plate body (4) is formed with a concave profile structure (41), and the width of the corresponding rib (51) of the profile structure (41) is greater than the width of the corresponding rib (51) of the region outside the profile structure (41).

18. The lifting hood according to claim 1 or 10, characterized in that: The smoke inlet (22) is arranged obliquely downward from front to back, and the grid-shaped oil screen (5) is arranged above the smoke inlet (22), and the oil screen (5) is arranged obliquely downward from front to back.

19. The lifting hood according to claim 18, characterized in that: The upper cabinet (1) has an upper cabinet front plate (11) and an upper cabinet rear plate (12), and the distance between the lowest point of the front side of the fan (3) and the upper cabinet front plate (11) is greater than the distance between the lowest point of the rear side of the fan (3) and the upper cabinet rear plate (12).

20. The lifting hood according to claim 1 or 10, characterized in that: The lower cabinet (2) is driven to move up and down relative to the upper cabinet (1) by a driving mechanism.

21. A lifting type range hood, comprising an upper cabinet (1) and a lower cabinet (2), the lower cabinet (2) is arranged on the upper cabinet (1), and the lower cabinet (2) and the upper cabinet (1) can move up and down relative to each other, the fan (3) is installed in the upper cabinet (1), and the lower cabinet (2) has a smoke inlet (22), characterized in that: There is a vertical plane S, the impeller axis L of the fan (3) is completely located in the vertical plane S, the plane where the smoke inlet (22) is located is perpendicular to the vertical plane S, the intersection of the vertical plane S and the upper edge of the smoke inlet (22) is B, the intersection of the impeller axis and the plane M where the volute cover plate located on the side of the main air inlet of the fan (3) is A, in the state that the lower box (2) rises to the highest position, the slope of the line connecting point A to point B is k1, in the state that the lower box (2) falls to the lowest position, the slope of the line connecting point A to point B is k2, and |k1-k2|≥0.8 is satisfied; In the state that the lower box (2) rises to the highest position, the upper box (1) is at least partially accommodated in the lower box (2), and the slope k1 of the line connecting point A to point B satisfies |k1|≥4; In the state that the lower box (2) falls to the lowest position, the slope k2 of the line connecting point A to point B satisfies |k2|≥7; The intersection of the impeller axis and the plane M' where the volute cover plate of the front air inlet (31) of the fan (3) is A', a first plate body (4) is installed below the fan (3), the transverse portion of the first plate body (4) extends in the front-rear direction, the transverse portion of the first plate body (4) has a highest point C at the frontmost end and a lowest point D at the rearmost end on the vertical plane S, in the state that the lower box (2) falls to the lowest position, the line connecting point A' to point B gradually inclines downward from front to back with a slope k2', the line connecting point C to point D gradually inclines downward from front to back with a slope k3, and |k2'|>|k3| is satisfied, and |k2'-k3|≤50 is satisfied; The transverse portion is arranged to be obliquely downward from front to back, and the slope k3 satisfies 0.01≤|k3|≤0.75; The upper box (1) has an upper box front plate (11), the lower box (2) has a lower box front plate (21), and the vertical distance d' between point A' to the outer surface of the upper box front plate (11) and the vertical distance e' between point A' to the inner surface of the lower box front plate (21) satisfy 0.7≤d' / e'<1; There is a gap between the upper box front plate and the lower box front plate, the minimum distance a' between point A' to the upper edge of the lower box front plate and the minimum distance b' between point A' to the lower edge of the upper box front plate satisfy 0.2≤a' / b'≤0.9; A grid-shaped oil screen (5) is arranged in the lower box (2), the oil screen (5) is arranged above the smoke inlet (22), the oil screen (5) has ribs (51) spaced apart in the left-right direction, the ribs (51) extend in the front-rear direction, the width of the ribs (51) in the middle region is greater than the width of the ribs (51) on the left and right sides, in the projection along the direction perpendicular to the horizontal plane, the projection of the ribs (51) in the middle region overlaps with the projection of the first plate body (4), in the overlapping part, the maximum width of the ribs (51) in the middle region is L1, along the same projection direction, the width of the first plate body (4) corresponding to the maximum width L1 is L2, and L1 / L2≤2 / 5 is satisfied; The oil net (5) is arranged below the first plate body (4), and the transverse part of the first plate body (4) is formed with a concave embossed structure (41), and the corresponding rib (51) width of the embossed structure (41) is greater than the corresponding rib (51) width of the area outside the embossed structure (41).

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