CN116928715A - Lifting type fume exhaust fan - Google Patents

Abstract

The lifting type range hood comprises a lower box body, an air inlet body, an upper box body, a lower box body, an air inlet body, a fan air outlet and a fan air inlet body, wherein the lower box body moves up and down relative to the upper box body, the air inlet body moves up and down relative to the lower box body, the upper box body is internally provided with the fan, the height difference between the lowest positions of the air outlet of the fan and the air inlet body is H1 when the lower box body and the air inlet body are lifted up to the highest positions, and the height difference between the lowest positions of the air outlet of the fan and the lower box body is H2 when the air inlet body is completely positioned in the lower box body, and the height difference between the air outlet of the fan and the lowest positions of the lower box body is more than or equal to 0.55H1 and less than or equal to 0.75H1; when one part of the air inlet body is positioned in the lower box body and the other part is positioned outside the lower box body, the height difference between the air outlet of the fan and the lowest part of the air inlet body is H3, and the requirement of 0.6H1H 3 is less than or equal to 0.8H1 is met. The range hood is small in size in a lifting state through two-stage lifting, space occupation is reduced, an air inlet in a descending state is closer to a smoke source, oil smoke can be sucked faster through reduction of a negative pressure area, and the fan mounting position can be higher and further away from human ears, so that noise is reduced.

Description

Lifting type fume exhaust fan

Technical Field

The utility model relates to the technical field of range hoods, in particular to a lifting range hood.

Background

The range hood is one of the indispensable devices in modern home kitchens, and as the application rate of the range hood is higher and higher, people pay more attention to the fume suction effect and the installation attractiveness of the range hood. The traditional top-draft type range hood is large in size, a cooking person can easily bump the head, if the distance between the air inlet of the range hood and a lampblack generating area is large, the suction path of lampblack is long, the suction time is increased, the lampblack escaping phenomenon is easy to occur in the cooking process, if the installation height of the range hood is reduced, the smoke inlet is as close to a smoke source as possible, the negative pressure is expanded downwards, the lampblack sucking effect is improved, the cooking space is too small, the head of the cooking person can inadvertently touch the smoke collecting hood easily, and the whole appearance of the sight and the kitchen is also influenced after the installation height is reduced. Therefore, people invent a lifting type range hood, namely, the smoke inlet can lift, the smoke inlet descends when the machine is started, and the smoke inlet ascends when the machine is shut down. The range hood comprises a smoke collecting cavity, a fan component and a lifting component, wherein the fan component is arranged in the smoke collecting cavity, the lifting component is connected with the smoke collecting cavity, and the lifting component can drive the smoke collecting cavity to lift. When the range hood operates, the lifting assembly drives the smoke collecting cavity to descend below the cabinet, the fan assembly is started to suck and exhaust oil smoke, when the range hood does not operate, the lifting assembly drives the smoke collecting cavity to ascend to the inside of the cabinet, the fan assembly is closed, the range hood is of a single-stage lifting structure, the whole range hood is provided with only one lifting assembly of the smoke collecting cavity, the structure is relatively simple, the position constraint relation to be considered is relatively limited, if the range hood with a two-stage lifting structure is required to be considered, the lifting assemblies have enough descending stroke, the oil smoke sucking effect is improved by obviously downwards moving the negative pressure area of the oil smoke sucking area, the height of the whole range hood can be reduced under the condition that the lifting assemblies are lifted is required to be considered, and the range hood is more compact and concise in structure, and hidden installation is realized. In view of the above, there is a need for further improvement of the structure of the conventional lifting range hood.

Disclosure of Invention

The utility model aims to solve the technical problem of providing the lifting type range hood which can improve the oil fume suction effect by obviously lowering the negative pressure area in the working state and has lower overall height in the non-working state.

The technical scheme adopted for solving the technical problems is as follows: this over-and-under type range hood, including last box, lower box and air inlet body, down the box locate on the box and can make elevating movement relative to last box, the air inlet body is located down on the box and can make elevating movement relative to lower box, install the fan in the last box, its characterized in that:

in the state that the lower box body and the air inlet body are both lowered to the lowest position, the height difference between the air outlet of the fan and the lowest position of the air inlet body is H1,

when the air inlet body is completely positioned in the lower box body in a state that both the lower box body and the air inlet body are lifted to the highest position, the height difference between the air outlet of the fan and the lowest position of the lower box body is H2, and the H2 is more than or equal to 0.55H1 and less than or equal to 0.75H1; when one part of the air inlet body is positioned in the lower box body and the other part of the air inlet body is positioned outside the lower box body, the height difference between the air outlet of the fan and the lowest part of the air inlet body is H3, and the requirement that H3 is more than or equal to 0.6H1 and less than or equal to 0.8H1 is met.

Preferably, the height of the fan is L1, the height of the main body of the air inlet body is L3, and in the state that both the lower box body and the air inlet body are lifted to the highest position, at least 30% of the height L1 of the fan is located in the lower box body, and at least 80% of the height L3 of the main body of the air inlet body is located in the lower box body. So set up, under non-operating condition, lower box can hold the main part of fan and air inlet body to make the complete machine height reduction.

Further preferably, in a state that the lower box body is lifted to the highest position, the height of the air inlet body in the lower box body is L4, the height of the upper box body in the lower box body is L5, the height of the lower box body is L6, and the conditions that L4+L5 is more than or equal to aL6 and a is 0.8, 0.85, 0.9 or 0.95 are satisfied. So set up, under non-operating condition, can make full use of the inner space of lower box holds last box and air inlet body to reduce the complete machine height as far as possible.

In order to limit the minimum descending travel of the whole machine, the negative pressure area can be lowered by a sufficient distance, preferably, in a state that the lower box body is lowered to the lowest position, the height of the fan is L1, the air inlet body is provided with an air inlet, and the height from the bottommost end of the air inlet to the horizontal plane where the bottommost end of the fan is located is L2, so that the following conditions are satisfied: l2 is equal to or greater than bL1, and b is 1.3, 1.4, 1.5 or 1.6.

Preferably, the upper box body is connected with the lower box body in a nested way, and the outer wall surface of the upper box body is at least partially nested in the lower box body. The structure of box on the box is gone up in the parcel of box down in the adoption for on the one hand, the greasy dirt is from last box along potential flow to inside the box down, and under arbitrary state, the outer surface of box down is at the outermost of complete machine all the time, therefore the outer surface of box down can not be polluted by the greasy dirt, and need not too much oil circuit design between last box and the box down, and box front panel down can set up to a monoblock big panel, makes the outward appearance succinct pleasing to the eye. On the other hand, the noise of the fan enters the accommodating cavity of the lower box body after passing through the fan frame, the static pressure box is simulated, and the unsteady flow separation caused by the distortion of the air inlet is improved, so that the pressure pulsation is reduced, the sound quality is improved, and the noise can be counteracted by utilizing the resistance silencing principle in the accommodating cavity. The fan shake is transferred to the lower box body, the contact area between the lower box body and the wall surface is increased, and the shake frequency of the whole machine is reduced.

Preferably, an oil cup is mounted at the bottom of the air inlet body, and at least part of the oil cup extends into the lower box body under the state that both the lower box body and the air inlet body are lifted to the highest position. So set up, under non-operating condition, the oil cup can be hidden, and the structure of range hood is succinct more, pleasing to the eye.

In order to enable the air inlet body to be completely hidden in the lower box body in a non-working state, the oil cup completely stretches into the lower box body in a state that both the lower box body and the air inlet body are lifted to the highest position, so that the bottom of the oil cup is flush with or higher than the bottom of the lower box body.

In order to enable the negative pressure area to move downwards enough under the working state, the top end of the lower box body is connected with the bottom end of the upper box body under the state that the lower box body and the air inlet body are lowered to the lowest position, and the air inlet of the air inlet body is completely exposed below the lower box body. So set up, the air intake of the air inlet body is close to the smoke source more, does benefit to the promotion oil smoke effect.

Preferably, the bottom of the lower box body is provided with a smoke baffle plate which is transversely arranged. Therefore, the smoke baffle plate can play a role in blocking smoke, and is beneficial to reducing the escape of the smoke.

Further preferably, the air inlet is provided with an upper guide plate, the upper guide plate is arranged at the rear side of the smoke baffle, and the lowest edge of the upper guide plate is lower than the bottom surface of the smoke baffle. By the arrangement, the height of the air inlet can be reduced, and a large amount of oil smoke is prevented from directly striking the smoke baffle plate, so that more condensed oil is condensed on the smoke baffle plate.

Further preferably, the upper baffle extends obliquely upward from the lowest edge toward the air inlet. The tail end of the upper guide plate is bent, so that on one hand, the guide effect is realized, and the oil smoke can enter the air inlet body more smoothly along the bending direction; on the other hand, has the function of oil guiding groove.

Further preferably, the lower case body includes a first air inlet channel and a second air inlet channel which are mutually communicated, the first air inlet channel is arranged below the second air inlet channel and is close to the rear part of the second air inlet channel, and the main body part of the air inlet body is at least partially positioned in the first air inlet channel under other states except the state that the lower case body and the air inlet body are lowered to the lowest position, and the fan is at least partially positioned in the second air inlet channel. So set up, under non-operating condition, lower box can hold the main part of fan and air inlet body to reduce the complete machine height.

Further preferably, the width W2 of the second air intake passage in the front-rear direction and the width W1 of the first air intake passage in the front-rear direction satisfy: w2 > W1. So set up, the oil smoke passes through long and narrow first air inlet passageway and gets into second air inlet passageway, reentrant last box, because second air inlet passageway's front and back width is narrower, and the oil smoke velocity of flow is fast, can drive outflow field realization and pull the air current more fast, give the bigger backward speed of oil smoke in the same time, avoid the oil smoke to escape outward. But at the same time, the air flow at the air inlet is disturbed to cause uneven oil smoke flow rate at the air inlet and influence the oil smoke absorbing effect, and the second air inlet channel with large width is positioned at the downstream of the first air inlet channel, so that the second air inlet channel can construct an efficient pressure stabilizing cavity due to large volume, the air flow is buffered and stabilized in the pressure stabilizing cavity, the air inlet is ensured to have basically the same air speed, and the problem of smoke leakage at two sides of the range hood is avoided. And in the greasy dirt in the last box can drip down the box, the problem that fluid splashes and falls is difficult to handle, especially fan system inside condensate oil more condition, and the second air inlet channel of broad size can effectively reduce the wind speed, reduces the orbit influence of air current to the oil drop, avoids the oil drop that drips on the spiral case to splash.

Further preferably, the width W2 of the second air intake passage in the front-rear direction and the width W1 of the first air intake passage in the front-rear direction satisfy: w2 is more than or equal to 1.5W1. So set up, first air inlet channel and second air inlet channel's structure has constituted variable cross section air inlet channel, can effectively block the outside direct transmission of fan system noise, thereby the sound wave that sends from the fan is offset at the inside multiple reflection of broad second air inlet channel through the noise elimination principle of simulation resistance, consequently constitutes variable cross section acoustic impedance, weakens the energy that sound was propagated from fan air intake to lampblack absorber air intake. In addition, the airflow buffer cavity is constructed to simulate the static pressure box, so that unsteady flow separation caused by inlet distortion can be improved, pressure pulsation is reduced, and sound quality is improved.

Preferably, in any of the above schemes, the lower case is driven by the first driving mechanism to move up and down, the air inlet body is driven by the second driving mechanism to move up and down, and the lower case and the air inlet body move up and down synchronously.

As the preferable mode of any scheme, the lower box body and the air inlet body are driven by the same set of driving mechanism to synchronously lift.

Preferably, in any of the above aspects, the fan is a centrifugal fan.

Compared with the prior art, the utility model has the advantages that: according to the lifting type range hood, through setting the height difference H1 between the air outlet of the fan and the lowest position of the air inlet body in the state that the lower box body and the air inlet body are lowered to the lowest position, when the air inlet body is completely positioned in the lower box body in the state that the lower box body and the air inlet body are raised to the highest position, the height difference H2 between the air outlet of the fan and the lowest position of the lower box body is set, and the requirements of 0.55H1 and 0.75H1 are met; when the air inlet body part stretches into the lower box body, the height difference H3 between the air outlet of the fan and the lowest part of the air inlet body is not less than 0.6H1 and not more than 0.8H1, so that the whole machine is small in size under the rising state through double-stage lifting, space occupation is reduced, the air inlet under the falling state is closer to a smoke source, oil smoke can be sucked faster due to the reduction of a negative pressure area, the mounting position of the fan can be higher, and the noise is reduced due to the fact that the distance between the air inlet body part and the air inlet body part is farther from human ears. In addition, the size change of the whole range hood is larger in the two states, on one hand, the hidden lifting can be realized, the range hood occupies small space, the appearance is more attractive, on the other hand, the negative pressure area of the oil fume suction is reduced, and the oil fume suction effect is improved.

Drawings

Fig. 1 is a schematic structural view of a range hood according to an embodiment of the present utility model (in a non-operating state);

fig. 2 is a front view of the range hood of fig. 1;

fig. 3 is a cross-sectional view of the range hood of fig. 2 in the A-A direction;

fig. 4 is a schematic structural view (in an operating state) of a range hood according to an embodiment of the present utility model;

fig. 5 is a front view of the range hood of fig. 4;

fig. 6 is a perspective cross-sectional view of the range hood of fig. 4;

fig. 7 is a B-B cross-sectional view of the range hood of fig. 5;

fig. 8 is a schematic structural diagram of an air intake body according to an embodiment of the present utility model.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

The scheme of this embodiment is realized under the range hood along vertical wall installation state, as shown in fig. 1 to 7, the lifting range hood of this embodiment includes an upper box 1, a lower box 2 and an air inlet body 3, a fan 4 is installed in the upper box 1, an oil cup 5 is installed at the bottom of the air inlet body 3, the lower box 2 is arranged on the upper box 1 and can make lifting motion relative to the upper box 1, and the air inlet body 3 is arranged on the lower box 2 and can make lifting motion relative to the lower box 2, namely, a two-stage lifting structure is realized. The lower box body 2 and the air inlet body 3 can synchronously lift under the drive of a set of driving mechanism, the lower box body 2 can also lift under the drive of a first driving mechanism, the air inlet body 3 can lift under the drive of a second driving mechanism, and the lower box body 2 and the air inlet body 3 still keep synchronous lifting.

As shown in fig. 7, in a state where both the lower case 2 and the air intake body 3 are lowered to the lowest positions, the height difference between the air outlet of the blower 4 and the lowest position of the air intake body 3 is H1. As shown in fig. 3, in the state that both the lower case 2 and the air inlet body 3 rise to the highest position, in this embodiment, the air inlet body 3 is completely located in the lower case 2, the height difference between the air outlet of the fan 4 and the lowest position of the lower case 2 is H2, H2 represents the height of the whole machine in the rising state, and H1 and H2 satisfy 0.55H1 and H2 and 0.75H1. If under the state that lower box 2 and air inlet body 3 all rise to the highest position, there is the condition that air inlet body 3 partly is located lower box 2, and another part is located lower box 2 outside, let fan 4 air outlet and air inlet body 3 the difference in height of the lowest department be H3, if neglect the oil cup height by oneself, this difference in height H3 is the complete machine height under the state of rising, at this moment, H1 and H3 need satisfy: 0.6H1 is less than or equal to H3 and is less than or equal to 0.8H1. After the height difference H2 and H3 meet the above relation, the whole machine is small in size in a rising state, space occupation is reduced, an air inlet in a falling state is closer to a smoke source, smoke can be sucked faster by reducing a negative pressure area, the whole machine is large in size change in two states, on one hand, hidden lifting can be achieved, the occupied space of the smoke ventilator is small, the appearance is attractive, on the other hand, the negative pressure area of the smoke ventilator is reduced, and the smoke ventilator effect is improved.

Assuming that the height of the fan 4 is L1, the fan in this embodiment is a centrifugal fan, and the height of the fan 4 refers to the vertical distance between the horizontal plane where the lowest point of the volute is located and the horizontal plane where the highest point is located in the mounted state of the fan 4. Referring to fig. 8, the air intake body 3 of this embodiment includes a main body portion 32 and extending arms 33 extending vertically upwards on the left and right sides of the main body portion, the air inlet 31 of the air intake body 3 is disposed on the front side of the main body portion 32, the air intake channel is formed in the main body portion 32, the extending arms 33 are used to cooperate with the lower case 2 in the lifting process, on one hand, the lifting of the air intake body 3 is guided, and on the other hand, oil smoke is prevented from leaking between the air intake body 3 and the lower case 2. Assuming that the height of the main body portion 32 is L3, in a state that both the lower case 2 and the air inlet body 3 are raised to the highest positions, at least 30% of the height L1 of the blower 4 is located in the lower case 2, and at least 80% of the height L3 of the main body portion 32 of the air inlet body 3 is located in the lower case 2, that is, in a non-operating state, the lower case 2 can accommodate the blower 4 and the main body portion 32 of the air inlet body 3, so that the overall height is reduced, the overall machine can be conveniently hidden in a cabinet, and the aesthetic degree is improved.

As shown in fig. 3, in the state that the lower case 2 and the air inlet body 3 are lifted to the highest position, the air inlet body 3 and the oil cup 5 can be divided into various different situations, and one situation is that the air inlet body 3 and the oil cup 5 are all completely extended into the lower case 2, as in the embodiment, the bottom of the oil cup 5 is flush with the bottom of the lower case 2, or the bottom of the oil cup 5 is higher than the bottom of the lower case 2; in another case, the air inlet body 3 extends into the lower box body completely, and the bottom of the oil cup 5 is exposed out of the bottom of the lower box body 2 or the whole oil cup 5 is exposed out of the bottom of the lower box body 2; in addition, the bottom of the air inlet body 3 and the whole oil cup 5 are exposed at the bottom of the lower box body 2.

The height of the air inlet body 3 in the lower box body 2 is assumed to be L4, the height of the upper box body 1 in the lower box body 2 is assumed to be L5, the height of the lower box body 2 is assumed to be L6, and the conditions that L4+L5 is more than or equal to aL6 and a is 0.8, 0.85, 0.9 or 0.95 are satisfied. Therefore, in the non-working state, the inner space of the lower box body 2 can be fully used for accommodating the upper box body 1 and the air inlet body 3, so that the height of the whole machine is reduced as much as possible. In addition, the requirement that L4+L5< L6 is satisfied is also met, so that in the non-working state, the air inlet body 3 and the fan 4 have no overlapped part in the vertical direction, and a certain gap exists, so that the oil on the fan 4 is conveniently led into the air inlet body 3.

As shown in fig. 7, in this embodiment, when the lower case 2 and the air inlet 3 are both lowered to the lowest positions, the top end of the lower case 2 is engaged with the bottom end of the upper case 1, that is, the lower case 2 reaches the maximum lowering stroke, the main body 32 of the air inlet 3 integrally extends downward from the lower case 2, the air inlet 31 is completely exposed, and the air inlet 3 also reaches the maximum lowering stroke. The height from the bottommost end of the air inlet 31 to the horizontal plane where the bottommost end of the fan 4 is located is L2, and satisfies: l2 is greater than or equal to bL1, and b is 1.3, 1.4, 1.5 or 1.6, so that the minimum descending stroke of the whole machine can be limited, the negative pressure area can be lowered by a sufficient distance, and the fume suction effect is further improved.

The range hood of this embodiment adopts the structure that the lower box 2 wraps up the upper box 1, namely the upper box 1 is nested with the lower box 2, and the outer wall surface of the upper box 1 is at least partially nested in the lower box 2. Adopt the structure of box 1 on the lower box 2 parcel, on the one hand for greasy dirt is from the inside box 2 down in 1 cisoid flow of box, and under arbitrary state, box 2 surface is outside at the complete machine all the time down, therefore box 2 surface can not be polluted by the greasy dirt down, and need not too much oil circuit design between box 1 and the box 2 down, and box 2 front panel down can set up to a monoblock big panel, makes the outward appearance succinct pleasing to the eye. On the other hand, the noise of the fan 4 enters the accommodating cavity of the lower box body 2 after passing through the fan frame, simulates the static pressure box, and improves the unsteady flow separation caused by the distortion of the air inlet, so that the pressure pulsation is reduced, the sound quality is improved, and the noise can be counteracted by utilizing the resistance silencing principle in the accommodating cavity. The fan shake is transferred to the lower box body, the contact area between the lower box body 2 and the wall surface is increased, and the shake frequency of the whole machine is reduced.

As shown in fig. 6 and 7, taking the direction indicated by the arrow C in fig. 7 as the backward direction, the bottom of the lower box 2 is provided with a horizontally arranged smoke baffle 6, the air inlet 31 is provided with an upper baffle 7, the upper baffle 7 is arranged at the rear side of the smoke baffle 6, the lowest edge of the upper baffle 7 is lower than the bottom surface of the smoke baffle 6, and after the upper oil guide 7 is arranged, on one hand, the height of the air inlet can be reduced, and on the other hand, a large amount of oil smoke can be prevented from directly striking the smoke baffle 6 so as to condense more condensed oil on the smoke baffle. In addition, the upper deflector 7 of this embodiment is inclined upwards from the lowest border to extend in towards the air intake and form the bending part 71, bending part 71 plays the water conservancy diversion effect on the one hand, and the oil smoke of being convenient for gets into air inlet body 3 along bending direction more smoothly, and on the other hand has the oil guide groove effect, guides the fluid on the upper deflector 7 left and right sides.

As shown in fig. 7, the lower case 2 of the present embodiment includes a first air inlet channel 21 and a second air inlet channel 22 that are in fluid communication with each other, the first air inlet channel 21 is disposed below the second air inlet channel 22 and near the rear of the second air inlet channel 22, in other states except the state where the lower case 2 and the air inlet body 3 are lowered to the lowest position, the main body 32 of the air inlet body 3 is at least partially located in the first air inlet channel 21, and the blower 4 is at least partially located in the second air inlet channel 22. Wherein, the width W2 of the second air inlet channel 22 in the front-back direction and the width W1 of the first air inlet channel 21 in the front-back direction meet 1.1W1 which is less than or equal to W2 which is less than or equal to 4W1. In this embodiment, the first air intake passage 21 and the second air intake passage 22 are each of a regular rectangular structure, that is, W1 and W2 are each kept unchanged in the respective height directions. In the case of an irregular structure, it is also necessary to satisfy that: 1.1W1W 2 is less than or equal to 4W1.

After the variable cross-section air inlet channel is adopted, the oil smoke enters the second air inlet channel 22 through the long and narrow first air inlet channel 21, and then enters the upper box body 1, because the front-back width of the first air inlet channel 21 is narrow, the oil smoke flow speed is high, the outflow field can be driven to realize faster pulling of the air flow, and the larger backward speed of the oil smoke is fed in the same time, so that the oil smoke is prevented from escaping. But at the same time, the air flow at the air inlet is disturbed, so that the oil smoke flow rate at the air inlet is uneven, the oil smoke absorbing effect is influenced, the second air inlet channel 22 with a large width is positioned at the downstream of the first air inlet channel 21, and at the moment, the second air inlet channel 22 can construct an efficient pressure stabilizing cavity due to the large volume, so that the air flow is buffered and stabilized in the pressure stabilizing cavity, the air inlet is ensured to have basically the same air speed, and the problem of smoke leakage at two sides of the range hood is avoided. And the greasy dirt in the upper box 1 can drip in the lower box 2, and the problem that fluid splashes and drifts is difficult to handle, especially fan 4 inside condensate oil more condition, and the wide second air inlet channel 22 can effectively reduce the wind speed, reduces the orbit influence of air current to the oil drop, avoids the oil drop that drips on the spiral case to splash.

In addition, the variable cross-section air inlet channel can effectively prevent the noise of the fan 4 from being directly transmitted outwards, and sound waves emitted from the fan 4 are reflected for many times in the second air inlet channel 22 to be counteracted through the simulation resistance silencing principle, so that the variable cross-section acoustic impedance is constructed, and the energy of sound transmitted from the fan air inlet to the range hood air inlet is weakened. In addition, the airflow buffer cavity is constructed to simulate the static pressure box, so that unsteady flow separation caused by inlet distortion can be improved, pressure pulsation is reduced, and sound quality is improved.

In addition, in order to increase the abrupt change between the flow channel width W2 of the second air inlet channel 22 and the flow channel width W1 of the first air inlet channel 21, the effects of the abrupt change of the variable cross-section channel on buffering, stabilizing, reducing noise and intercepting greasy dirt of the air flow are ensured, and when the lower box body and the air inlet body are both lowered to the lowest positions, the W2 and the W1 satisfy: 2W 1.ltoreq.W2.ltoreq.3W1, and similarly, the second air intake passage 22 and the first air intake passage 21 are each of a regular rectangular structure, that is, W1 and W2 are each kept unchanged in the respective height directions. In the case of an irregular structure, it is also necessary to satisfy that: w1 is more than or equal to 2W 2 is more than or equal to 3W1.

In the description and claims of the present utility model, 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 utility model, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the utility model may be arranged in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting, such as "upper" and "lower" are not necessarily limited to being in a direction opposite or coincident with the direction of gravity.

The term "fluid communication" as used herein refers to a spatial positional relationship between two parts or portions, hereinafter collectively referred to as a first portion and a second portion, respectively, that is, a fluid gas, a liquid, or a mixture of both can flow along a flow path from the first portion to the second portion, or can be directly communicated with each other between the first portion and the second portion, or can be indirectly communicated with each other between the first portion and the second portion through at least one third member, which can be a fluid channel such as a pipe, a channel, a conduit, a flow guide, a hole, a groove, or the like, or can be a chamber allowing a fluid to flow through, or a combination thereof.

Claims (17)

1. The utility model provides a lifting type range hood, includes box (1), lower box (2) and air inlet body (3), lower box (2) are located on box (1) and can be relative box (1) and do elevating movement down, air inlet body (3) are located on box (2) and can be relative box (2) down and do elevating movement down, install fan (4), its characterized in that in the box (1) down:

in the state that the lower box body (2) and the air inlet body (3) are both lowered to the lowest position, the height difference between the air outlet of the fan (4) and the lowest position of the air inlet body (3) is H1,

when the air inlet body (3) is completely positioned in the lower box body (2) in a state that both the lower box body (2) and the air inlet body (3) are lifted to the highest position, the height difference between the air outlet of the fan (4) and the lowest position of the lower box body (2) is H2, and the requirements of 0.55H1H 2 and 0.75H1 are met; when one part of the air inlet body (3) is positioned in the lower box body (2) and the other part is positioned outside the lower box body (2), the height difference between the air outlet of the fan (4) and the lowest part of the air inlet body (3) is H3, and the requirement that the H3 is more than or equal to 0.6H1 and less than or equal to 0.8H1 is met.

2. The lifting range hood of claim 1, wherein: the height of the fan (4) is L1, the height of the main body part (32) of the air inlet body (3) is L3, at least 30% of the height L1 of the fan (4) is positioned in the lower box body (2) under the condition that both the lower box body (2) and the air inlet body (3) are lifted to the highest position, and at least 80% of the height L3 of the main body part (32) of the air inlet body (3) is positioned in the lower box body (2).

3. The lifting range hood of claim 1, wherein: under the state that lower box (2) rises to the highest position, the height that air inlet body (3) is located in lower box (2) is L4, the height that upper box (1) is located in lower box (2) is L5, the height of lower box (2) is L6, satisfies that L4+L5 is greater than or equal to aL6, and a is 0.8, 0.85, 0.9 or 0.95.

4. The lifting range hood of claim 1, wherein: under the state that lower box (2) descends to the minimum position, fan (4) highly is L1, air inlet body (3) set up air intake (31), the height of the horizontal plane that bottom to fan (4) bottom place of air intake (31) is L2, satisfies: l2 is equal to or greater than bL1, and b is 1.3, 1.4, 1.5 or 1.6.

5. The lifting range hood of claim 1, wherein: the upper box body (1) is connected with the lower box body (2) in a nested mode, and the outer wall surface of the upper box body (1) is at least partially nested in the lower box body (2).

6. The lifting range hood of claim 1, wherein: the bottom of the air inlet body (3) is provided with an oil cup (5), and the oil cup (5) at least partially stretches into the lower box body (2) under the condition that the lower box body (2) and the air inlet body (3) are both lifted to the highest position.

7. The lifting range hood of claim 6, wherein: under the state that lower box (2) and air inlet body (3) all rise to the highest position, oil cup (5) stretch into under box (2) inside completely so that oil cup (5) bottom and lower box (2) bottom flush or be higher than lower box (2) bottom.

8. The lifting range hood of claim 1, wherein: under the state that lower box (2) and air inlet body (3) all descend to the minimum position, lower box (2) top links up with last box (1) bottom mutually, air intake (31) of air inlet body (3) expose in the below of lower box (2) completely.

9. The lifting range hood of claim 8, wherein: the bottom of the lower box body (2) is provided with a smoke baffle plate (6) which is transversely arranged.

10. The lifting range hood of claim 9, wherein: the air inlet (31) is provided with an upper guide plate (7), the upper guide plate (7) is arranged at the rear side of the smoke baffle (6), and the lowest edge of the upper guide plate (7) is lower than the bottom surface of the smoke baffle (6).

11. The lifting range hood of claim 10, wherein: the upper deflector (7) extends obliquely upwards from the lowest edge towards the inside of the air inlet (31).

12. The lifting range hood of claim 1, wherein: the lower box body (2) comprises a first air inlet channel (21) and a second air inlet channel (22) which are mutually communicated, the first air inlet channel (21) is arranged below the second air inlet channel (22) and is close to the rear part of the second air inlet channel (22), and under other states except the state that the lower box body (2) and the air inlet body (3) are lowered to the lowest position, the main body part (32) of the air inlet body (3) is at least partially positioned in the first air inlet channel (21), and the fan (4) is at least partially positioned in the second air inlet channel (22).

13. The lifting range hood of claim 12, wherein: the width W2 of the second air inlet channel (22) in the front-rear direction and the width W1 of the first air inlet channel (21) in the front-rear direction meet the following conditions: w2 > W1.

14. The lifting range hood of claim 13, wherein: the width W2 of the second air inlet channel (22) in the front-rear direction and the width W1 of the first air inlet channel (21) in the front-rear direction meet the following conditions: w2 is more than or equal to 1.5W1.

15. The lifting range hood according to any one of claims 1 to 14, wherein: the lower box body (2) is driven by the first driving mechanism to do lifting motion, the air inlet body (3) is driven by the second driving mechanism to do lifting motion, and the lower box body (2) and the air inlet body (3) do synchronous lifting motion.

16. The lifting range hood according to any one of claims 1 to 14, wherein: the lower box body (2) and the air inlet body (3) are driven by the same set of driving mechanism to synchronously lift.

17. The lifting range hood according to any one of claims 1 to 14, wherein: the fan (4) is a centrifugal fan.