CN219550631U - Oil smoke escape prevention device and range hood assembly comprising same - Google Patents

Abstract

The utility model provides an oil fume escape prevention device and a range hood assembly comprising the same, and relates to the technical field of oil fume purification. The device for preventing the fume from escaping comprises a fan, a ventilation pipeline and a plurality of nozzles, wherein the fan provides a power air source for the ventilation pipeline. The ventilation pipeline comprises a plurality of pipelines, a working area is formed by surrounding the pipelines, a plurality of nozzles are arranged on the pipelines in an array mode, air flows sprayed by the nozzles form an injection area in the working area, and pressure differences are formed on two sides of the injection area along the rising direction of the oil smoke. When a user cooks, the oil smoke mixed air flow rises upwards due to lower density and is scattered everywhere, and the oil smoke mixed air flow is carried by the air flow sucked by the nozzle and moves towards the center of the injection area together, so that the escape of oil smoke is prevented.

Description

Oil smoke escape prevention device and range hood assembly comprising same

Technical Field

The utility model relates to the technical field of oil fume purification, in particular to an oil fume escape prevention device and a range hood assembly comprising the same.

Background

The cooking mode in China generally generates more oil smoke, and the oil smoke can pollute the indoor environment and also harm the health of people. Therefore, the range hood has become an indispensable kitchen facility for modern households as an electric appliance for purifying the kitchen environment.

The widely used household range hoods are mainly divided into a top-suction type range hood and a side-suction type range hood, wherein the top-suction type range hood is usually arranged right above a kitchen range and is arranged at a higher position relative to the kitchen range, and when cooking, the oil smoke can rise upwards, and the top-suction type range hood sucks the oil smoke into the range hood from the upper part and then is discharged out of the room. However, in the current process of using the top-suction type range hood, it is found that the cooking fume generated by the user cannot be concentrated or spread everywhere, and thus cannot be completely absorbed by the top-suction type range hood.

Disclosure of Invention

The utility model aims to overcome the defect that cooking fume generated by cooking of a user cannot be concentrated or spread everywhere to cause the phenomenon that the cooking fume cannot be absorbed completely in the prior art, and provides an oil fume escape prevention device and a range hood assembly comprising the same.

The utility model solves the technical problems by the following technical scheme:

an oil fume escape prevention device, comprising: the device comprises a fan, a ventilation pipeline and nozzles, wherein an air outlet of the fan is communicated with an air inlet of the ventilation pipeline, the ventilation pipeline is arranged above oil smoke, the ventilation pipeline comprises a plurality of pipelines, a plurality of pipelines are arranged around to form a working area, and a plurality of nozzles arranged in an array are arranged on the pipelines; and the air flow generated by the fan is sprayed into the working area through a plurality of nozzles to form an injection area, and pressure difference is formed at two sides of the injection area along the rising direction of the oil smoke.

In this scheme, the air outlet of fan and ventilation line's air intake intercommunication provide power air supply for ventilation line. The ventilation pipeline comprises a plurality of pipelines, a working area is formed by surrounding the pipelines, a plurality of nozzles are arranged in an array mode on the pipelines, a power air source provided by the fan is sprayed into the working area through the nozzles at a certain speed, the air flow sprayed by the nozzles forms an injection area in the working area, and the injection area forms pressure difference along two sides of the oil smoke rising direction. The air flow sprayed from the nozzle pushes a large amount of air in front of the nozzle to move to generate entrainment, and the surrounding air flow can flow to the ejection area along with the entrainment, so that the ejected air flow is far greater than the air flow sprayed from the nozzle. When a user cooks, the oil smoke mixed air flow rises upwards due to lower density and is scattered everywhere, and the oil smoke mixed air flow is carried by the air flow sucked by the nozzle and moves towards the center of the injection area together, so that the escape of oil smoke is prevented.

Preferably, the range of the included angles between the spraying directions of the nozzles and the rising direction of the oil smoke is 60-120 degrees.

In this scheme, through setting the contained angle between the injection direction of nozzle and the oil smoke rising direction to 60-120 degrees for the injection region that the air current that is spouted by the nozzle formed is in the pipeline encloses the working region of establishing formation, and can select the angle that the nozzle sprayed in this within range according to actual conditions, and the range of application is wider.

Preferably, the included angles between the spraying directions of the nozzles and the rising direction of the oil smoke are 90 degrees.

In this scheme, the contained angle between the injection direction of nozzle and the oil smoke rising direction is 90 degrees and is the optimal selection, and the injection region that is formed by the injection of nozzle is perpendicular with the rising direction of oil smoke this moment, more is favorable to forming the pressure differential of injection region both sides to more make things convenient for the concentration after the oil smoke rises, can not produce the escape.

Preferably, the speed of the air flow generated by the fan through the nozzles to be sprayed into the working area is greater than or equal to 20m/s.

In the scheme, the air flow speed of the jet of the nozzle is set to be greater than or equal to 20m/s, so that the jet area formed by the jet of the nozzle can form pressure difference at two sides of the oil smoke rising direction, and the concentration of the oil smoke after rising is more facilitated.

Preferably, a plurality of the nozzles are linearly and uniformly arranged on the pipeline, and the distance between adjacent nozzles is greater than or equal to 3cm.

In the scheme, when the air flow speed of the jet nozzle is larger than or equal to 20m/s, the jet distance of the adjacent jet nozzles is larger than or equal to 3cm, so that the jet distance is prevented from being too small, and entrainment of surrounding air around the air flow of the jet nozzles is not facilitated.

Preferably, the air inlet of the ventilation pipeline is arranged at the middle part of the ventilation pipeline.

In this scheme, through seting up the air intake of ventilation pipeline in ventilation pipeline's middle part, can make the corresponding position wind-force velocity of flow in air intake both sides the same, the air current that the nozzle of ventilation pipeline relative position jetted out is more stable, avoids appearing the air current and suddenly rises and suddenly falls the problem.

Preferably, a plurality of pipelines connected in sequence are enclosed to form a closed area, or a plurality of pipelines connected in sequence are enclosed to form a closed area with a wall body; and/or the middle parts of the pipelines are provided with air inlets, and the number of the fans is the same as that of the pipelines.

In this scheme, enclose through a plurality of pipelines that will connect gradually and establish and form the enclosed area, perhaps enclose a plurality of pipelines that will connect gradually and wall body and establish and form the enclosed area, can form even air current in the enclosed area, more be favorable to forming the pressure difference that draws the regional both sides of penetrating. Further, the number of fans is the same as that of the pipelines, and the requirements of wind speed are met more conveniently.

Preferably, a surface of the pipeline, on which the nozzle is arranged, is a plane.

In the scheme, the pressure difference can be formed quickly for the sprayed air flow, so that the air flow speed can be higher; at the same time, the nozzle is made easier to be fixedly mounted.

Preferably, the nozzles each comprise a spray hole, and the spray holes are circular in shape.

In the scheme, the spray hole of the nozzle is arranged to be circular, air flows through the circular spray hole to spray a beam of air flow, a large amount of air in front of the nozzle is pushed to move to produce entrainment effect, so that the effect of injecting the air flow is better, and the concentration of oil smoke is more facilitated.

Preferably, the device for preventing the oil fume from escaping further comprises a sealing element, and the sealing element is arranged at the joint of the air outlet of the fan and the air inlet of the ventilation pipeline.

In this scheme, be provided with the sealing member at the junction of the air outlet of fan and the air intake of vent line, increase the leakproofness of whole device, reduce the loss.

The range hood assembly comprises the top-suction type range hood and the oil fume escape prevention device, wherein the ventilation pipeline is arranged below the top-suction type range hood.

In this scheme, through set up the escape device of preventing the oil smoke in the below of top-draft range hood, prevent the escape after the oil smoke rises, carry out the concentration of oil smoke through the escape device of preventing the oil smoke, reuse top-draft range hood will concentrate the oil smoke after absorbing again and discharge.

The utility model has the positive progress effects that:

the air flow sprayed out of the nozzle in the oil fume escape device pushes a large amount of air in front of the nozzle to move to generate entrainment effect, and surrounding air flow can flow to the injection area along with the entrainment effect, so that the injected air flow is far greater than the air flow sprayed out of the nozzle. When a user cooks, the oil smoke mixed air flow rises upwards due to lower density and is scattered everywhere, and the oil smoke mixed air flow is carried by the air flow sucked by the nozzle and moves towards the center of the injection area together, so that the escape of oil smoke is prevented.

Drawings

Fig. 1 is a schematic overall structure of an oil fume escape prevention device according to an embodiment of the present utility model.

Fig. 2 is a schematic front view showing the overall structure of an oil smoke escape prevention device according to an embodiment of the present utility model.

Fig. 3 is a schematic structural view of a ventilation pipeline of an oil fume escape prevention device according to an embodiment of the utility model.

Fig. 4 is a schematic structural view of a nozzle of an apparatus for preventing oil smoke from escaping according to an embodiment of the present utility model.

Fig. 5 is a schematic diagram (one) of a nozzle direction and a lampblack direction of a lampblack escape prevention device according to an embodiment of the utility model.

Fig. 6 is a schematic diagram (two) of a nozzle direction and a smoke direction of a device for preventing smoke from escaping according to an embodiment of the utility model.

Fig. 7 is a schematic diagram (iii) of a nozzle direction and a lampblack direction of a lampblack escape prevention device according to an embodiment of the utility model.

Fig. 8 is a schematic diagram of an overall assembly structure of a device for preventing oil smoke escape and a top suction type range hood according to an embodiment of the present utility model.

Reference numerals illustrate:

top suction type range hood 100

Blower 200

Pipeline 310

Air inlet 320

Nozzle 400

Nozzle 410

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below are exemplary and intended to illustrate the present utility model and should not be construed as limiting the utility model, and all other embodiments, based on the embodiments of the present utility model, which may be obtained by persons of ordinary skill in the art without inventive effort, are within the scope of the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In this embodiment, the device for preventing oil smoke from escaping includes a fan 200, a ventilation pipeline and a nozzle 400, wherein an air outlet of the fan 200 is communicated with an air inlet 320 of the ventilation pipeline, the ventilation pipeline is arranged above the oil smoke, the ventilation pipeline includes a plurality of pipelines 310, the plurality of pipelines 310 are surrounded to form a working area, and the pipelines 310 are provided with a plurality of nozzles 400 arranged in an array; the air flow generated by the fan 200 is sprayed into the working area through the plurality of nozzles 400 to form an injection area, and pressure difference is formed at two sides of the injection area along the oil smoke rising direction.

Since the plurality of nozzles 400 are jetting into the working area, that is, the plurality of nozzles 400 are disposed on the side of the pipe 310 facing the working area. In addition, the plurality of nozzles 400 are punctiform outlets, the air flow is instantaneously reduced from the large section of the pipeline 310 to the small section of the nozzles 400, and after being sprayed out by the nozzles 400, the air flow can reach a high-speed air flow, and finally, in the oil smoke rising direction, the pressure difference is formed at two sides of an injection area formed by the high-speed air flow.

Specifically, as shown in fig. 1, 2 and 3, the ventilation pipe in this embodiment is composed of three pipes 310 connected in sequence. However, the present utility model is not limited thereto, and in other embodiments, the three pipes 310 may not be connected, but may be disposed at intervals. In other embodiments, the number of the pipes 310 may be other numbers, such as two, four, etc., and other numbers of the pipes 310 may be sequentially connected or may be arranged at intervals.

In this embodiment, adjacent pipes 310 are vertically arranged, the blower 200 is disposed in the middle of the ventilation pipeline, and the air outlet of the blower 200 is communicated with the air inlet 320 of the ventilation pipeline, and the blower 200 is used as a wind power source to provide wind power for the ventilation pipeline. In addition, a sealing piece is arranged at the joint of the air outlet of the fan 200 and the air inlet 320 of the ventilation pipeline, so that the tightness of the whole device is further improved, and the loss is reduced.

The mixed airflow of the oil smoke generated by a user in the cooking process rises upwards due to lower density, a ventilation pipeline formed by sequentially connecting three pipelines 310 is arranged above a kitchen range for generating the oil smoke, and a working area is formed by surrounding the three pipelines 310. In this embodiment, the working area is an open area formed by surrounding three pipes 310, and the open area is the whole three-dimensional area in the rising direction of the oil smoke. Wherein, a plurality of nozzles 400 are uniformly arranged on each pipeline 310 in an array, the air flow generated by the fan 200 is sprayed into the working area through the plurality of nozzles 400 to form an injection area, and pressure difference is formed at two sides of the injection area along the rising direction of the oil smoke. Of course, in other embodiments, the number and shape of the pipes 310 may be adjusted according to the shape of the range hood, for example, the pipes 310 may be curved, and the pipes 310 may be disposed at an included angle.

In this embodiment, as shown in fig. 5, the H direction is the direction in which the soot rises, and the a direction is the injection direction of the nozzle 400. The included angle alpha formed by the spraying direction of the plurality of nozzles 400 and the rising direction of the oil smoke is 90 degrees, namely, the plurality of nozzles 400 spray to form air flow to form an injection area, the injection area is a horizontal plane, the horizontal plane is perpendicular to the rising direction of the oil smoke, and the air flow sprayed by the nozzles 400 is utilized to enable pressure difference to be formed at two sides of the injection area in the rising direction of the oil smoke. The air flow ejected from the nozzle 400 pushes a large amount of air in front of the nozzle 400 to generate entrainment, and the surrounding air flow also flows to the ejection area, so that the ejected air flow is far greater than the air flow ejected from the nozzle 400. When a user cooks, the oil smoke mixed air flow rises upwards due to lower density and spreads around, and is carried by the air flow sucked by the nozzle 400 and moves towards the center of the injection area together, so that the escape of oil smoke is prevented.

As described above, in this embodiment, the included angle α between the injection direction of the plurality of nozzles 400 and the rising direction of the oil smoke is 90 degrees, so that the injection area formed by the injection air flows of the plurality of nozzles 400 is a plane, the injection area formed by the injection of the nozzles 400 is perpendicular to the rising direction of the oil smoke, which is more favorable for forming a pressure difference on two sides of the injection area in the rising direction of the oil smoke, thereby being more convenient for the concentration of the oil smoke after rising and avoiding escape.

Of course, in other embodiments, the included angle α between the spraying direction of the plurality of nozzles 400 and the rising direction of the oil smoke may be set to any other angle besides 0 degree or 180 degrees, but it should be noted that the air flow sprayed by the plurality of nozzles 400 needs to be sprayed into the working area, so the plurality of nozzles 400 need to be disposed inside the pipe 310, and the nozzle opening of the nozzle 400 is disposed toward the working area, and in this case, the included angle α between the spraying direction of the plurality of nozzles 400 and the rising direction of the oil smoke may be adjusted between 0 degrees and 180 degrees (excluding 0 degrees and 180 degrees).

Under the general condition, the oil smoke mixed air flow can rise upwards to scatter everywhere due to lower density, and the oil smoke escape prevention device is arranged, so that the oil smoke can be close to a negative pressure area after rising. When the amount of the oil smoke is relatively normal, the included angle α between the injection direction of the plurality of nozzles 400 and the rising direction of the oil smoke is set to 90 degrees, so that a horizontal injection area is formed, and the injection area generates a pressure difference at two sides of the rising direction of the oil smoke, so that the rising oil smoke is collected. However, when the amount of the oil smoke is too much, the oil smoke is drawn upwards to rise, so that the oil smoke at the injection area is possibly caused to be too much, and part of the oil smoke cannot pass through the injection area, so that the oil smoke escapes from the edge of the injection area, at this time, the included angle between the injection direction of the plurality of nozzles 400 and the rising direction of the oil smoke can be set to be an acute angle, so that the plurality of nozzles 400 are sprayed upwards in an inclined manner, the injection area formed can be inclined upwards, the rising space of the oil smoke is increased, and the escape from the edge of the injection area when the oil smoke is too much is avoided. Similarly, when the amount of the oil smoke is too small, the mutual traction between the oil smoke becomes small, if the oil smoke is too far away from the injection area after the oil smoke is generated, the oil smoke can directly and outwards cross and escape after the oil smoke is generated, at this time, the included angle between the injection direction of the plurality of nozzles 400 and the rising direction of the oil smoke can be set to be an obtuse angle, so that the plurality of nozzles 400 can be obliquely and downwards injected, the injection area formed can also be obliquely and downwards inclined, the rising distance of the oil smoke is reduced, and the oil smoke can be prevented from directly and outwards cross and escaping after the oil smoke is generated.

Preferably, the range of the angles is 60-120 degrees between the spraying direction of the plurality of nozzles 400 and the rising direction of the oil smoke. At this time, the injection area formed by the air flows injected from the plurality of nozzles 400 is within the working area formed by surrounding the pipe 310, and the injection angle of the nozzles 400 can be selected within the range according to the actual situation, and the pressure difference is formed at two sides of the injection area in the oil smoke rising direction more conveniently within the angle range.

For example, as shown in fig. 6, the H direction is still the direction in which the soot rises, the B direction is the spraying direction of the nozzle 400, and the included angle α between the two is 60 degrees. When the included angle between the spraying direction of the plurality of nozzles 400 and the rising direction of the oil smoke is set to 60 degrees, the spraying direction of the nozzles 400 is sprayed obliquely upward with respect to the pipes 310, and then the plurality of nozzles 400 on the plurality of pipes 310 are sprayed obliquely upward, that is, in the working area formed by the plurality of pipes 310, the plurality of nozzles 400 on each pipe 310 are sprayed obliquely upward to form the spraying plane, and then the plurality of spraying planes are intersected with each other to form the spraying area. As another example, as shown in fig. 7, the H direction is still the direction in which the soot rises, the C direction is the spraying direction of the nozzle 400, and the included angle α between the two is 120 degrees. When the included angle between the spraying direction of the plurality of nozzles 400 and the rising direction of the oil smoke is set to 120 degrees, the spraying direction of the nozzles 400 sprays obliquely downwards relative to the pipeline 310, so that the plurality of nozzles 400 on the plurality of pipelines 310 spray obliquely downwards, that is, in a working area formed by the plurality of pipelines 310, the plurality of nozzles 400 on each pipeline 310 spray obliquely downwards to form a spraying plane, and the plurality of spraying planes intersect with each other to form an injection area. However, no matter the nozzles 400 spray obliquely upwards or downwards, the formed injection area is still in the working area, and the projection areas of the injection area in the rising direction of the oil smoke are equal, when a user cooks, the oil smoke mixed air flow is rising upwards due to lower density and scattered everywhere, and the mixed air flow can be sucked and carried by the air flow sprayed out of the nozzles 400 and move towards the center of the injection area together, so that the escape of the oil smoke is prevented.

Further, the speed of the air flow generated by the fan 200 sprayed into the working area through the plurality of nozzles 400 is more than or equal to 20m/s, so that the pressure difference is formed at two sides of the oil smoke rising direction in the injection area formed by the nozzles 400, and the concentration of the oil smoke after rising is more facilitated. In addition, the plurality of nozzles 400 are linearly and uniformly arranged on the duct 310, and the interval distance between adjacent nozzles 400 is 3cm or more, i.e., the interval between the nozzles 400 is prevented from being too small, which is disadvantageous in that surrounding gas forms entrainment around the gas flow sprayed from the nozzles 400. Of course, in other embodiments, the velocity of the airflow ejected from the nozzle 400 is not necessarily equal to or greater than 20m/s, the distance between adjacent nozzles 400 is not specifically required, and only the ejection area formed by the airflow ejected from the nozzle 400 needs to be satisfied, and the pressure difference is formed at two sides of the rising direction of the oil smoke.

As shown in fig. 1, 2 and 3, the air inlet 320 of the ventilation pipeline is formed in the middle of the ventilation pipeline, so that the wind velocity of the ventilation pipeline at the corresponding positions on both sides of the air inlet 320 is the same, the air flow ejected from the nozzles 400 at the opposite positions of the ventilation pipeline is more stable, and the problem of high and low air flow is avoided. Of course, in other embodiments, the air inlet 320 of the vent line need not be located at a middle portion of the vent line. That is, as described above, only the injection area formed by the air flow injected from the nozzle 400 needs to be satisfied, and the pressure difference is formed at both sides in the rising direction of the oil smoke, and there is no specific requirement on the flow rate of the air flow injected from the nozzle 400 and the specific setting position of the air inlet 320 of the ventilation pipeline on the ventilation pipeline.

As described above, in this embodiment, the ventilation pipe is formed by sequentially connecting three pipes 310, the three pipes 310 enclose a working area with an opening at one side, and the air flow is sprayed by using a plurality of nozzles 400 arranged on the three pipes 310, so that a spraying surface is formed on each pipe 310, and the three spraying surfaces are intersected or overlapped to form an injection area, so that the oil smoke rises to the center of the injection area to gather, and the oil smoke is prevented from escaping. It should be noted that, in this embodiment, the three pipes 310 may be arranged to form an injection area, and the ventilation pipeline formed by the three pipes 310 is closely connected with an external object, so that the effect of injecting air flow can be better exerted, for example, the ventilation pipeline formed by the three pipes 310 is arranged close to a wall, and a wall body is closely connected with the three pipes 310 to form a closed area, that is, the three pipes 310 and the wall body which are sequentially connected are enclosed to form a closed area.

Of course, more preferably, in other embodiments, the plurality of pipes 310 connected in sequence may be directly surrounded to form a closed area, so that uniform air flow is formed in all directions of the closed area, which is more beneficial for the injection area to form pressure difference at two sides of the oil smoke rising direction. In addition, the air inlets 320 may be formed in the middle of all the pipes 310, and the number of fans 200 is the same as the number of the pipes 310, so that the requirements of wind speed can be met more conveniently.

As shown in fig. 1, 2 and 3, the pipe 310 is provided with a plane surface on which the nozzle 400 is arranged, so that the air flow speed can be faster, and the air flow is rapidly ejected to form a pressure difference; at the same time, the nozzle 400 is made easier to fixedly mount. Specifically, the cross section of the duct 310 is formed in a rectangular shape, so that a face of the duct 310 on which the nozzle 400 is disposed is a plane. However, the cross section of the duct 310 is not limited thereto, and may be any other shape as long as the surface of the duct 310 on which the nozzle 400 is provided is a plane, and the pressure difference can be formed by rapidly jetting the air flow.

Further, as shown in fig. 4, one end of the nozzle 400 is provided with threads, the nozzle is in threaded connection with the pipeline 310, the other end of the nozzle is provided with a spray hole 410, the spray hole 410 is circular in shape, air flows through the circular spray hole 410 to spray a beam of air, and a large amount of air in front of the nozzle 400 is pushed to move to generate entrainment, so that the effect of injecting the air flows is better, and the concentration of oil smoke is more facilitated.

As shown in fig. 8, this embodiment also discloses a range hood assembly, which includes a top-suction type range hood 100 and the above-mentioned oil fume escape prevention device, and the ventilation pipe of the oil fume escape prevention device is disposed below the top-suction type range hood 100. Further, the ventilation pipeline of the oil fume escape prevention device is disposed closely to the top suction type range hood 100, but not limited thereto, and in other embodiments, the ventilation pipeline of the oil fume escape prevention device may be disposed at a distance from the top suction type range hood 100.

The ventilation pipeline of the oil fume escape prevention device is arranged along the outer periphery of the lower edge of the top suction type range hood 100 to prevent the oil fume from escaping after rising, the oil fume is concentrated through the oil fume escape prevention device, and the concentrated oil fume is absorbed and then discharged by the top suction type range hood 100. However, in other embodiments, the ventilation pipe of the oil fume escape prevention device may be disposed along the outer periphery of the lower edge of the top-suction type range hood 100, as required.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (11)

1. An oil fume escape prevention device, which is characterized by comprising:

the device comprises a fan, a ventilation pipeline and nozzles, wherein an air outlet of the fan is communicated with an air inlet of the ventilation pipeline, the ventilation pipeline is arranged above oil smoke, the ventilation pipeline comprises a plurality of pipelines, a plurality of pipelines are arranged around to form a working area, and a plurality of nozzles arranged in an array are arranged on the pipelines;

and the air flow generated by the fan is sprayed into the working area through a plurality of nozzles to form an injection area, and pressure difference is formed at two sides of the injection area along the rising direction of the oil smoke.

2. The oil fume escape prevention device according to claim 1, wherein the range of the included angles between the spray directions of the plurality of nozzles and the rising direction of the oil fume is 60-120 degrees.

3. The oil fume escape prevention device according to claim 2, wherein the spray directions of the plurality of nozzles are each 90 degrees from the rising direction of the oil fume.

4. The oil fume escape prevention device according to claim 1, wherein the speed of the air flow generated by said fan being sprayed into said working area through a plurality of said nozzles is 20m/s or more.

5. The oil fume escape apparatus according to claim 4, wherein a plurality of said nozzles are arranged linearly and uniformly on said pipe, and adjacent said nozzles are spaced apart by a distance of 3cm or more.

6. The oil fume escape prevention device according to claim 1, wherein the air inlet of the ventilation pipeline is formed in the middle part of the ventilation pipeline.

7. The oil fume escape prevention device according to claim 1, wherein a plurality of the pipes connected in sequence are enclosed to form a closed area, or a plurality of the pipes connected in sequence are enclosed to form a closed area with a wall; and/or the middle parts of the pipelines are provided with air inlets, and the number of the fans is the same as that of the pipelines.

8. The oil fume escape apparatus according to claim 1, wherein a face of said pipe on which said nozzle is provided is a plane.

9. The oil fume escape apparatus according to claim 1, wherein said nozzles each comprise an orifice, said orifice being circular in shape.

10. The oil fume escape prevention device according to claim 1, further comprising a sealing member, wherein the sealing member is disposed at a connection portion between an air outlet of the blower and an air inlet of the ventilation pipeline.

11. A range hood assembly, characterized in that the range hood assembly comprises a top-suction range hood and an oil fume escape prevention device according to any one of claims 1-10, and the ventilation pipe is arranged below the top-suction range hood.