CN116817340A - Lifting type fume exhaust fan - Google Patents

Abstract

The utility model provides a lifting type range hood, includes box, lower box and air inlet body, and on the box was located to lower box, on the air inlet body was located down the box, its characterized in that: the fan is installed in the upper box body, the range hood is at least provided with two states, the top end of the lower box body is connected with the bottom end of the upper box body in the first state, the air inlet body extends out of the bottom of the lower box body and descends to the lowest position, the lower box body is lifted to the highest position in the second state, the fan is at least partially located in the lower box body, and the air inlet body is at least partially located in the lower box body and ascends to the highest position. The utility model has the advantages that: the lifting type range hood is in a first state, the descending stroke of the air inlet body is large, the negative pressure area moves downwards to the lowest position, the fume sucking effect is improved, in a second state, the fan is at least partially located in the lower box body, the air inlet body is at least partially located in the lower box body and is lifted to the highest position, the whole machine is small in size, simple and compact in structure, convenient for guiding oil, beneficial to hiding the whole machine in a kitchen hanging cabinet, and attractive in appearance.

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 discharge 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, and if the range hood with a secondary lifting structure is used for achieving the aims of large descending stroke and small lifting, the position constraint relation among a plurality of different lifting assemblies is needed to be considered.

In the prior art, the single-stage lifting range hood has the defects that the air inlet is far away from the smoke source, the negative pressure area is positioned at a high position, and the oil smoke absorbing effect is poor. The existing double-stage lifting range hood still occupies a large space independently, and oil stains on the inner wall of a box body of the range hood adhere to the outer wall surface of a lower box body in the lifting process, so that the problem that the oil stains drop to a cooking bench from the outer wall surface exists.

After the negative pressure area of the double-stage lifting range hood is reduced, the air inlet is close to a smoke source, the smoke is instantly sucked into the range hood after being generated, a large amount of smoke can be accumulated in the cavity of the range hood, and the flow rate of the smoke sucked from the narrow air inlet is high, so that the airflow can be disordered and jammed in the cavity of the range hood, and the generated smoke cannot be effectively absorbed and discharged. On the other hand, the problem that noise is large and the shake of the whole machine caused by the fan is large exists at the moment of starting the fan of the range hood.

Disclosure of Invention

The utility model aims to solve the technical problems of the prior art, and provides the lifting type range hood with good fume suction effect in a starting state and small whole machine volume in a shutdown 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 last box, the air inlet body is located down on the box, its characterized in that: the fan is installed in the upper box body, the range hood is at least provided with two states, in the first state, the top end of the lower box body is connected with the bottom end of the upper box body, the air inlet body extends out of the bottom of the lower box body and descends to the lowest position, in the second state, the lower box body is lifted to the highest position so that the fan is at least partially located in the lower box body, and in the second state, the air inlet body is at least partially located in the lower box body and is lifted to the highest position.

The lifting type range hood has a plurality of lifting states, the lower box body can be lifted relative to the upper box body, so that the upper box body is at least partially contained in the lower box body, the air inlet body can extend out of the lower box body, and the air inlet body can be contained in the lower box body after being lifted. In the process of changing the second state from the first state to the second state, the range hood is changed from the lifting state to the descending state, the second state is that the lower box body is lifted to the highest position capable of being lifted, the air inlet body is lifted to the highest position capable of being lifted, the first state is that the lower box body is lowered to the lowest position capable of being lowered, and the air inlet body is also lowered to the lowest position capable of being lowered.

In this scheme make complete machine negative pressure district reduce through doublestage lift, the air intake forms the route of side range hood after falling and the air inlet body that descends is ultra-thin, consequently can not produce the influence to the culinary art operation completely, and the position of negative pressure district just is favorable to the range hood and highly can not keep off the pot promptly under the first state. The lower box body wraps the fan so that oil stains can flow into the lower box body from the upper box body in the clockwise direction, and in any state, the outer surface of the lower box body is always arranged on the outermost surface of the whole machine, so that the outer surface of the lower box body cannot be polluted by the oil stains, excessive oil path designs are not needed between the upper box body and the lower box body, and the front panel of the lower box body can be arranged into a whole large panel, so that the appearance is concise and attractive. The lower box body wraps the fan and the air inlet body, the oil smoke enters the lower box body after passing through the air inlet body, the design of the lower box body is not limited by the size of the fan box body, and therefore, enough space design can be provided for the lower box body to accumulate more oil smoke and optimize a flow passage. On the other hand, the lower box body wraps the fan box body, noise of the fan enters the accommodating cavity of the lower box body after being transmitted out of the fan frame, the static pressure box is simulated, unsteady flow separation caused by air inlet distortion is improved, pressure pulsation is reduced, sound quality is improved, and noise can be counteracted in the accommodating cavity by utilizing a resistance silencing principle. 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.

In order to enable the whole machine volume in the shutdown state to be small enough and be convenient for oil of fan system to lead out downwards smoothly, go up box height and be L1, lower box height is L2, the height of air inlet body main part is L3, in the second state, distance H2 between fan air outlet and the bottom of lower box satisfies L1+L3 < H2 and is less than or equal to aL2, and 1 < a is less than or equal to 1.8.

In order to enable the whole machine volume under the shutdown state to be small enough, and be convenient for the oil of fan system to lead out downwards smoothly, go up box height and be L1, lower box height is L2, the height of air inlet body main part is L3, under the second state, distance H3 between fan air outlet and the air inlet body bottommost satisfies L1+L3 < H3, distance H2 between fan air outlet and the lower box bottommost satisfies H2 and is less than or equal to aL2, and 1 < a is less than or equal to 1.8.

The air inlet body comprises a front plate, a rear plate, a left side plate, a right side plate and a bottom plate, an air inlet is formed in the front plate of the air inlet body, and oil smoke is in fluid communication with the lower box body from the air inlet through a channel at the top end of the air inlet body. The height of the main body part of the air inlet body refers to the vertical distance between the horizontal plane where the highest position of the top edge of the front plate is located and the horizontal plane where the lowest position of the bottom plate is located.

Under the limitation of the relational expression, the blower and the air inlet body can be hidden in the upper box body, and are not overlapped and directly contacted in the horizontal direction, and the blower and the air inlet body are in a position relation of being arranged at intervals along the vertical direction, so that the greasy dirt of the blower system can be smoothly led into the air inlet body in the second state, and then enter an oil cup at the bottom end of the air inlet body. And H2 is less than or equal to aL2, and the upper limit value of a is limited, so that the lower box body is ensured to have enough height, the descending stroke is large when the lower box body is lifted, and a negative pressure area for gathering smoke is formed on the bottom surface of the lower box body and the side surface of the air inlet body, so that the negative pressure area of the whole machine can be reduced to the position closest to a smoke source.

Preferably, in the second state, a gap is formed between the horizontal plane where the lowest end of the fan is located and the horizontal plane where the highest position of the air inlet body is located. Therefore, the fan system is not overlapped and directly contacted with the main body of the air inlet body, so that the oil of the fan system can be smoothly led into the oil cup at the bottom of the air inlet body from top to bottom in the shutdown state.

In order to ensure that the gap does not affect the height dimension of the complete machine in the second state, the height h1 of the gap satisfies: the h1 is more than 0 and less than or equal to 80mm, so that the greasy dirt is ensured to flow down into the air inlet body from the fan, then flows into the oil cup, and meanwhile, the occupied space of the whole machine is saved.

In order to ensure that the lower box body has a large enough movement stroke and can accommodate the fan in a second state, the proportion of the overlapping part of the lower box body and the upper box body in the height direction in the shutdown state is limited, the fan and the lower box body have the overlapping part in the vertical direction in the second state, and the height of the overlapping part accounts for 40% -80% of the height of the upper box body. So set up, the inner space of box under can make full use of, on the other hand, lower box is used for holding the cavity volume of fan great, under the oil smoke state, by the rapid inhaled oil smoke can be in this cavity steady voltage stationary flow for oil smoke is more smooth and easy by the exhaust.

In order to guarantee that the air intake is close the smoke source more under the oil smoke absorption state for whole quick-witted negative pressure area reduces, under the first state, the air inlet body downwardly extending in the height of lower box bottom is h2, the descending stroke of lower box from the second state to the first state is h3, satisfy between h2 and the h 3: h2/h3 is more than or equal to 0.3 and less than or equal to 1.

In order to ensure that the whole machine descends enough stroke under the oil fume suction state, the height of the whole machine under the first state is limited, and under the first state, the distances H1 between the air outlet of the fan and the bottom of the air inlet body and L1, L2 and L3 satisfy the following conditions: H1/(L1+L2+L3) < 1, which is more than or equal to 0.75, is arranged in such a way that the negative pressure area is closer to the smoke source, thereby improving the oil smoke absorbing effect.

In order to ensure that the whole machine is small enough in the non-oil fume suction state, the height of the whole machine in the second state is limited, and in the second state, the distance H2 between the air outlet of the fan and the bottom of the lower box body and the distances L1, L2 and L3 satisfy the following conditions: the H2/(L1+L2+L3) is more than or equal to 0.5 and less than or equal to 0.8, so that the space is saved.

Further preferably, in any time period in the lifting process of the lower box body and the air inlet body, the displacement of the lower box body relative to the upper box body is larger than the displacement of the air inlet body relative to the lower box body. Thus, the lifting speed of the air inlet body is smaller than that of the lower box body.

Further preferably, the lower box body comprises a first air inlet channel and a second air inlet channel which are mutually communicated, the first air inlet channel is arranged at the rear lower part of the second air inlet channel, the air inlet body is at least partially positioned in the first air inlet channel in other states except the first state, and the fan is at least partially positioned in the second air inlet channel.

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, second air inlet channel can form efficient steady voltage chamber, and first air inlet channel's width is narrower, and consequently the velocity of flow is faster, and the oil smoke can be inhaled second air inlet channel rapidly, and the oil smoke can be buffered steady voltage in this steady voltage intracavity to smooth and easy discharge also guarantees simultaneously that inlet port department has basically the same wind speed, avoids the problem that the range hood both sides run the cigarette.

Further preferably, the upper box body further comprises a fan frame, the fan can be double air inlet or back air inlet, a third air inlet channel is arranged between the back air inlet of the fan and a back plate of the fan frame, the width W1 of the first air inlet channel in the front-back direction is larger than the width W3 of the third air inlet channel in the front-back direction, and thus, oil stains in the third air inlet channel can drop into the first air inlet channel and then flow into an oil cup at the bottom.

In order to collect oil conveniently, an oil cup is arranged at the bottom of the air inlet body, and in a second state, at least part of the oil cup stretches into the lower box body.

Further preferably, the oil cup extends completely into the lower tank so that the bottom of the oil cup is flush with or higher than the bottom of the lower tank. Therefore, in the non-working state, the range hood is compact and simple in structure, and when being installed, the range hood can be hidden in a cabinet, so that the range hood is attractive in appearance.

Further preferably, in the first state, a distance H1 between the air outlet of the fan and the bottom of the air inlet body satisfies: H1-H2 is more than or equal to 250mm, and H1-H2-L3 is more than or equal to 150mm. Therefore, the minimum descending stroke of the whole machine and the minimum descending stroke of the lower box body are further limited, the negative pressure area is ensured to descend by a sufficient distance, and the oil smoke absorbing effect is further effectively improved.

In order to drive the lower box body and the air inlet body to do lifting movement, the lower box body is driven by the driving mechanism to do lifting movement relative to the upper box body, and the air inlet body is driven by the driving mechanism to do lifting movement relative to the lower box body.

Compared with the prior art, the utility model has the advantages that: this lift range hood has two kinds of states at least, under the first state, lower box top links up with last box bottom mutually, the air inlet body stretches out in lower box bottom and descends to the minimum position, the air inlet body descends the stroke great, negative pressure district moves down to the minimum position, promote the oil smoke effect, under the second state, lower box lifts to the maximum position and makes the fan in the last box be located down the box at least partially, and the air inlet body is located down the box at least partially and lifts to the maximum position, the complete machine volume is less, the structure is succinct, compactly, be convenient for lead oil, do benefit to hiding the complete machine in kitchen wall cupboard, the aesthetic measure is high, save outside kitchen space.

Drawings

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

fig. 2 is a structural sectional view of the range hood shown in fig. 1;

fig. 3 is a schematic structural view of a range hood according to an embodiment of the present utility model (in a second state);

fig. 4 is a structural cross-sectional view of the range hood shown in fig. 3;

fig. 5 is a schematic view of the structure of the range hood shown in fig. 4 after the back plate of the lower case is removed.

Detailed Description

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

As shown in fig. 1 to 5, the lifting range hood of the present embodiment includes an upper case 1, a lower case 2, and an air intake body 3. Wherein, the inside fan frame 5 that is equipped with of last box 1, fan frame 5 internally mounted have fan 4, and fan 4 is the centrifugal fan of vertical setting, has front side inlet channel and rear side inlet channel. The lower case 2 is provided on the upper case 1 and can be moved up and down with respect to the upper case 1, and the lower case 2 is wrapped outside the upper case. The air inlet body 3 is arranged at the rear lower part of the lower box body 2 and can move up and down relative to the lower box body 2 by taking the direction indicated by an arrow A in fig. 4 as the rear side, and an oil cup 9 is arranged at the bottom of the air inlet body 3. The air intake body 3 of this embodiment includes a main body 31 and vertical extending portions 32 disposed on two sides of the main body 31 and extending upward, a smoke inlet 30 is formed on the main body 31, a guide rail 10 is installed between the vertical extending portions 32 and the back plate 21 of the lower case, and the air intake body 3 can move up and down along the guide rail 10 relative to the lower case 2.

The lower box body 2 and the air inlet body 3 can synchronously move under the drive of a set of driving mechanism, and can independently move under the drive of independent driving mechanisms. In any time period in the lifting process of the lower box body 2 and the air inlet body 3, the displacement of the lower box body 2 relative to the upper box body 1 is larger than the displacement of the air inlet body 3 relative to the lower box body 2, namely the lifting speed of the lower box body 2 relative to the upper box body 1 is larger than the lifting speed of the air inlet body 3 relative to the lower box body 2.

Under the drive of the driving mechanism, the lifting type range hood at least has a first state and a second state. In the first state, as shown in fig. 3 and fig. 4, the top end of the lower case 2 is engaged with the bottom end of the upper case 1, the air inlet body 3 extends out of the bottom of the lower case 2 and descends to the lowest position, and the lowest position refers to the position where the air inlet body is located when reaching the maximum descending stroke, namely, the first state is the state with the maximum descending stroke and corresponds to the large air volume working condition. In the second state, as shown in fig. 1 and 2, the lower case 2 is lifted to the highest position so that the fan 4 is at least partially located in the lower case 2, and the air inlet body 3 is at least partially located in the lower case 2 and lifted to the highest position, where the air inlet body 3 is located when reaching the maximum lifting stroke, that is, the second state is the state where the lifting stroke is the maximum, and is usually the shutdown state. In addition, according to the size of the oil smoke working condition, the range hood is also provided with other intermediate states except the first state and the second state, and the descending stroke of the lower box body 2 and the air inlet body 3 is moderate in other intermediate states.

In this embodiment, the lower case 2 includes a first air inlet channel 6 and a second air inlet channel 7 that are in fluid communication with each other, the first air inlet channel 6 is disposed at a rear lower portion of the second air inlet channel 7, and a width W2 in a front-rear direction of the second air inlet channel 7 and a width W1 in a front-rear direction of the first air inlet channel 6 satisfy: w2 is more than or equal to 1.5W1. Like this, second air inlet channel 7 forms efficient steady voltage chamber, and first air inlet channel 6 width is narrower, and the velocity of flow is faster, makes the oil smoke can be inhaled fast in the second air inlet channel, and the oil smoke can buffer steady voltage in steady voltage intracavity, and it is more smooth and easy to discharge, also guarantees simultaneously that the inlet 30 department of air inlet body 3 has the basically same wind speed, avoids the problem that the range hood both sides run the cigarette. In addition, the pressure stabilizing cavity can be internally provided with sound absorbing cotton for noise reduction, noise in the fan 4 can be well limited in the pressure stabilizing cavity, semi-isolation of a noise source to a user is realized, sound waves are reflected for multiple times in the large cavity, and the noise reduction effect of the sound absorbing cotton can be improved.

The fan 4 can adopt two air intakes or back air intake, in this embodiment, form third air inlet passageway 8 between the back air intake of fan 4 and the fan frame 5 back plate and be the back side air inlet passageway, third air inlet passageway 8 and first air inlet passageway 6, second air inlet passageway 7 phase fluid communication to, the width W1 in the front and back direction of first air inlet passageway 6 is greater than the width W3 in the front and back direction of third air inlet passageway 8, so, makes the fluid in the third air inlet passageway 8 can drip to first air inlet passageway 6, and then flows into in the oil cup 9 of air inlet body 3 bottom. In the first state, the fan 4 is integrally located above the second air inlet channel 7, the main body 31 of the air inlet body 3 is located below the first air inlet channel 6, and the vertical extension parts 32 of the air inlet body 3 form the left and right side walls of the first air inlet channel 6. In this embodiment, in the second state, the lower part of the fan 4 is located in the second air inlet channel 7, the air inlet body 3 is integrally hidden in the first air inlet channel 6, and the oil cup 9 completely extends into the lower box 2 so that the bottom of the oil cup 9 is flush with the bottom of the lower box 2. In addition, in the second state, the lower part of the air inlet body 3 may also extend below the lower case 2, and accordingly, the oil cup 9 is also completely exposed, or the bottom of the air inlet body 3 is flush with the bottom of the lower case 2 and the oil cup 9 is exposed, or the air inlet body 3 integrally extends into the lower case 2, but the upper part of the oil cup 9 extends into the lower case and the lower part is exposed to the lower case 2. In general, in intermediate states other than the first state and the second state, the air intake body 3 is at least partially located in the first air intake passage 6, and the blower 4 is at least partially located in the second air intake passage 7.

Let the height of the upper box 1 be L1, the height of the lower box 2 be L2, the height of the main body 31 of the air inlet 3 be L3, and in the second state, the distance H2 between the air outlet of the fan 4 and the bottommost part of the lower box 2 satisfies L1+L3 < H2.ltoreq.aL2, and 1 < a.ltoreq.1.8. Or in the second state, the distance H3 between the air outlet of the fan 4 and the bottommost part of the air inlet body 3 satisfies L1+L3 < H3, H2 is less than or equal to aL2, and a is more than 1 and less than or equal to 1.8. If the height of the oil cup 9 is ignored, h2=h3. Furthermore, it is also necessary to satisfy: l3 < L2 for lower box 2 is favorable to accomodating air inlet body 3 completely wherein in the altitude space, and lower box 2 still has unnecessary altitude space, can accomodate other structures again in the direction of height. The fact that L1+L3 is less than H2 indicates that the fan 4 and the air inlet body 3 are not overlapped and directly contacted, the fan 4 is located above the air inlet body 3 in the height direction, and in the second state, oil in the fan 4 is smoothly led into the oil cup 9 at the bottom end of the air inlet body 3 from top to bottom. H2 is less than or equal to aL2 (1 is less than or equal to a 1.8), the size of the whole machine is limited, the whole machine is prevented from being too large in the second state, and the kitchen space is saved.

In the second state, the range hood of the present embodiment also satisfies the following positional constraint relationship: a gap h1 is formed between the horizontal plane of the lowest end of the fan 4 and the horizontal plane of the highest position of the main body of the air inlet body 3, and h1 is more than 0 and less than or equal to 80mm, so that oil stains are guaranteed to flow into the air inlet body 3 from the fan in a homeotropic mode, then flow into the oil cup 9, and meanwhile space occupied by the whole machine is saved. The fan 4 and the lower box body 2 are provided with an overlapping part in the vertical direction, the height of the overlapping part accounts for 40% -80% of the height of the upper box body 1, so that the inner space of the lower box body 2 is fully utilized, the lower box body 2 is guaranteed to have a large enough movement stroke and can accommodate the fan 4 in a second state, on the other hand, the cavity volume of the lower box body for accommodating the fan is larger, and in an oil smoke absorbing state, quickly absorbed oil smoke can be stabilized in the cavity, so that the oil smoke can be discharged more smoothly. In addition, in order to limit the height of the whole machine in the second state, the size of the whole machine in the non-oil fume suction state is small enough, and the distances H2 between the air outlet of the fan 4 and the bottom of the lower box body 2 and L1, L2 and L3 satisfy the following conditions: H2/(L1+L2+L3) is more than or equal to 0.5 and less than or equal to 0.8.

In the first state, the distance H1 between the air outlet of the blower 4 and the bottom of the air inlet body 3 may be approximately H1 if the height of the oil cup 9 is ignored. Moreover, the H1-H2 is more than or equal to 250mm, and the H1-H2-L3 is more than or equal to 150mm. Therefore, the minimum descending stroke of the whole machine and the minimum descending stroke of the lower box body 2 can be limited, the negative pressure area can be ensured to descend by a sufficient distance, and then the oil smoke absorbing effect is effectively improved.

Under the first state, namely the large air quantity working condition, the height of the air inlet body 3 extending downwards from the bottom of the lower box body 2 is h2, the descending stroke of the lower box body 2 from the second state to the first state is h3, and the following conditions are satisfied between h2 and h 3: h2/h3 is more than or equal to 0.3 and less than or equal to 1. And, the distance H1 between the air outlet of the fan 4 and the bottom of the air inlet body 3 satisfies with L1, L2 and L3: H1/(L1+L2+L3) is more than or equal to 0.75 and less than 1. Through the two position constraint relations, the overall height of the range hood under the working condition of large air quantity can be limited, so that the negative pressure area is closer to the smoke source.

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 high box (1) that is L1, high box (2) and the air inlet body (3) that highly is L3 of main part down for L2, on box (1) were located down box (2), on box (2) were located down in air inlet body (3), its characterized in that: a fan (4) is arranged in the upper box body (1), the range hood has at least two states,

in the first state, the top end of the lower box body (2) is connected with the bottom end of the upper box body (1), and the air inlet body (3) extends out of the bottom of the lower box body (2) and descends to the lowest position;

in the second state, the lower box body (2) is lifted to the highest position, so that the fan (4) is at least partially positioned in the lower box body (2), the air inlet body (3) is lifted to the highest position and is at least partially positioned in the lower box body (2), and the distance H2 between the air outlet of the fan (4) and the bottommost part of the lower box body (2) meets the condition that L1+L3 is less than H2 and less than or equal to aL2, wherein 1 is less than or equal to a and less than or equal to 1.8.

2. The utility model provides a lifting type range hood, includes high box (1) that is L1, high box (2) and the air inlet body (3) that highly is L3 of main part down for L2, on box (1) were located down box (2), on box (2) were located down in air inlet body (3), its characterized in that: a fan (4) is arranged in the upper box body (1), the range hood has at least two states,

in the first state, the top end of the lower box body (2) is connected with the bottom end of the upper box body (1), and the air inlet body (3) extends out of the bottom of the lower box body (2) and descends to the lowest position;

under the second state, lower box (2) rise to the highest position and make fan (4) at least partly be located lower box (2), just air inlet body (3) rise to the highest position and at least partly be located lower box (2), distance H3 between fan (4) air outlet and air inlet body (3) bottommost satisfies L1+L3 < H3, distance H2 between fan (4) air outlet and lower box (2) bottommost satisfies H2.ltoreq.aL2, wherein 1 < a.ltoreq.1.8.

3. The lifting range hood according to claim 1 or 2, wherein: in the second state, a gap is reserved between the horizontal plane where the lowest end of the fan (4) is located and the horizontal plane where the highest position of the main body of the air inlet body (3) is located.

4. A lifting range hood according to claim 3, wherein: the height h1 of the gap satisfies: h1 is more than 0 and less than or equal to 80mm.

5. The lifting range hood according to claim 1 or 2, wherein: in the second state, the fan (4) and the lower box body (2) are provided with overlapping parts in the vertical direction, and the height of the overlapping parts accounts for 40% -80% of the height of the upper box body (1).

6. The lifting range hood according to claim 1 or 2, wherein: under the first state, the height that air inlet body (3) downwardly extending in lower box (2) bottom is h2, the descending stroke of lower box (2) from the second state to the first state is h3, satisfy between h2 and the h 3: h2/h3 is more than or equal to 0.3 and less than or equal to 1.

7. The lifting range hood according to claim 1 or 2, wherein: in the first state, the distances H1 between the air outlet of the fan (4) and the bottom of the air inlet body (3) and L1, L2 and L3 satisfy the following conditions: H1/(L1+L2+L3) is more than or equal to 0.75 and less than 1.

8. The lifting range hood according to claim 1 or 2, wherein: in the second state, the distance H2 between the air outlet of the fan (4) and the bottom of the lower box body (2) and the distances L1, L2 and L3 satisfy the following conditions: H2/(L1+L2+L3) is more than or equal to 0.5 and less than or equal to 0.8.

9. The lifting range hood according to claim 1 or 2, wherein: in any time period in the lifting process of the lower box body (2) and the air inlet body (3), the displacement of the lower box body (2) relative to the upper box body (1) is larger than the displacement of the air inlet body (3) relative to the lower box body (2).

10. The lifting range hood according to claim 1 or 2, wherein: the lower box body (2) comprises a first air inlet channel (6) and a second air inlet channel (7) which are communicated with each other, and the first air inlet channel (6) is arranged at the rear lower part of the second air inlet channel (7).

11. The lifting range hood of claim 10, wherein: in other states except the first state, the air inlet body (3) is at least partially positioned in the first air inlet channel (6), and the fan (4) is at least partially positioned in the second air inlet channel (7).

12. The lifting range hood of claim 10, wherein: the width W2 of the second air inlet channel (7) in the front-back direction and the width W1 of the first air inlet channel (6) in the front-back direction meet the following conditions: w2 is more than or equal to 1.5W1.

13. The lifting range hood of claim 11, wherein: the upper box body (1) further comprises a fan frame (5), a third air inlet channel (8) is arranged between an air inlet of the fan (4) and a rear plate of the fan frame (5), and the width W1 of the first air inlet channel (6) in the front-back direction is larger than the width W3 of the third air inlet channel (8) in the front-back direction.

14. The lifting range hood according to claim 1 or 2, wherein: an oil cup (9) is arranged at the bottom of the air inlet body (3), and in a second state, the oil cup (9) at least partially stretches into the lower box body (2).

15. The lifting range hood of claim 14, wherein: in the second state, the oil cup (9) extends into the lower box body (2) completely so that the bottom of the oil cup (9) is flush with the bottom of the lower box body (2) or higher than the bottom of the lower box body (2).

16. The lifting range hood according to claim 1 or 2, wherein: in the first state, the distance H1 between the air outlet of the fan (4) and the bottom of the air inlet body (3) meets the following requirements: H1-H2 is more than or equal to 250mm, and H1-H2-L3 is more than or equal to 150mm.

17. The lifting range hood according to claim 1 or 2, wherein: the lower box body (2) is driven by the driving mechanism to do lifting motion relative to the upper box body (1), and the air inlet body (3) is driven by the driving mechanism to do lifting motion relative to the lower box body (2).