Cyclone guider for range hood and range hood

Abstract

The invention relates to the technical field of range hoods, in particular to a cyclone guider for a range hood and the range hood. The shrinkage pipe is connected to the front end of the throat pipe; the expansion pipe is connected to the rear end of the throat pipe, and a separation hole is formed in the side wall of the expansion pipe; the flow guide cone is arranged in the center of the throat pipe, and a nozzle is arranged in the flow guide cone; the inner sides of the first blades are fixedly connected to the outer surface of the flow guide cone, and the outer sides of the first blades are connected with the inner wall of the throat pipe; and the spraying pipeline is connected to the nozzle so as to provide the absorbent for the nozzle. Compared with the prior art, a physical centrifugal separation mechanism and a chemical absorption enhancement mechanism are combined in a breakthrough mode, and on the premise that low airflow resistance and low noise are maintained, the trapping efficiency of small-particle oil smoke and the lasting cleanliness of the system are synchronously improved.

Description

Technical Field

[0001] The present application relates to the technical field of range hoods, and in particular to a cyclone guide for a range hood and the range hood. Background Art

[0002] Currently, the range hood industry mainly uses physical interception technologies such as folded plate filtration, rotating mesh disk dynamic interception and filter material separation, which achieve basic purification of oil fume particles through collision, centrifugation or adsorption mechanisms, aiming to improve the quality of the cooking environment.

[0003] Solutions represented by folded plate filtration rely on inertial collision to intercept large particles of oil, rotating mesh disk technology uses high-speed rotating components to enhance centrifugal separation, and filter material separation uses porous media to adsorb particles; all three use the physical interception of oil fume particles as the core mechanism of action.

[0004] Due to the strong dependence of the physical interception mechanism on the movement characteristics of particles, existing technologies generally have systematic defects such as insufficient capture efficiency of small-size and low-kinetic energy particles, complex high-speed mechanical structures, and high maintenance costs due to filter material clogging, resulting in high oil fume escape rates and insufficient equipment reliability in scenarios with high purification requirements. Summary of the Invention

[0005] The present application provides a cyclone guide and a range hood for a range hood, so as to solve the common systemic defects of the prior art, such as insufficient efficiency in capturing small-size and low-kinetic-energy particles, complicated high-speed mechanical structure, and high maintenance cost of filter material clogging, which lead to technical problems such as high oil fume escape rate and insufficient equipment reliability in scenarios with high purification requirements.

[0006] In a first aspect, the present application provides a cyclone guide for a range hood, comprising:

[0007] throat;

[0008] A shrink tube connected to the front end of the throat;

[0009] An expansion tube connected to the rear end of the throat tube, wherein a separation hole is opened on the side wall of the expansion tube;

[0010] A guide cone is arranged at the center of the throat, and a nozzle is provided inside the guide cone;

[0011] a plurality of first blades, the inner sides of which are fixedly connected to the outer surface of the guide cone and the outer sides of which are connected to the inner wall of the throat pipe;

[0012] A spray line is connected to the nozzle to supply absorbent to the nozzle.

[0013] Furthermore, the shrink tube is provided with an air inlet channel, and the cross-sectional areas of the air inlet channel are arranged from large to small.

[0014] Furthermore, a plurality of second blades are provided at the front end of the shrinkable tube, and outer sides of the second blades are fixedly connected to the inner wall of the shrinkable tube.

[0015] Furthermore, the expansion tube is provided with an exhaust channel, and the cross-sectional areas of the exhaust channel are arranged from small to large.

[0016] Furthermore, an exhaust pipe is provided inside the expansion pipe. The exhaust pipe has the same shape as the expansion pipe, the volume of the exhaust pipe is smaller than the volume of the expansion pipe, and a gap is formed between the two.

[0017] Furthermore, the nozzles are distributed in a circular manner on the top of the guide cone, the angle between the direction of the nozzle and the axis of the guide cone is an acute angle, and the nozzles are arranged obliquely on the radial plane of the guide cone.

[0018] Furthermore, the separation holes are rectangular in shape, and there are a plurality of separation holes, which are distributed in an array on the side wall of the expansion tube.

[0019] In the second aspect, the present application also provides a range hood comprising: a housing, a smoke collecting chamber, and several cyclone guides for the range hood as described in the first aspect, wherein the housing is connected to the smoke collecting chamber, and the several cyclone guides are arranged in a rectangular array at the inlet end of the air duct and installed in the smoke collecting chamber.

[0020] Furthermore, a front cover plate is provided at the front end of the shrink tube, a rear cover plate is provided at the end of the expandable tube, a plurality of the front cover plates are spliced ​​together to form a front cover plate platform, and a plurality of the rear cover plates are spliced ​​together to form a rear cover plate platform;

[0021] The front cover platform is installed at the front end of the smoke collecting chamber, and the rear cover platform is installed at the front end of the smoke outlet of the box body. The front cover platform, the rear cover platform and the outer wall of the cyclone guide form an oil storage cavity, and the oil storage cavity is connected to the through hole of the side wall of the smoke collecting chamber.

[0022] Furthermore, the range hood also includes a pipe assembly, which includes a main pipe and several branch pipes. The main pipe is connected to several branch pipes, and the several branch pipes are respectively connected to the injection pipes in several cyclone guides, and the main pipe is connected to an external liquid supply device.

[0023] The above technical solution provided by this application has the following advantages compared with the existing technology:

[0024] This application addresses traditional technical deficiencies in the range hood industry through the following mechanisms: First, the combination of blades, guide cone, and throat creates a high-intensity centrifugal force field, enabling efficient separation of oil fume particles during high-speed rotation. Second, the nozzle inside the guide cone, combined with the spray line, sprays absorbent water mist, significantly promoting the aggregation and capture of small-sized oil fume particles while forming an anti-adhesion protective layer. Finally, the separation holes on the sidewall of the expansion tube achieve continuous grease removal through the synergistic effects of centrifugal force and gravity, preventing flow channel blockage. Compared to existing technologies, this application represents a breakthrough in integrating physical centrifugal separation with chemical absorption enhancement mechanisms, simultaneously improving the capture efficiency of small oil fume particles and the long-term cleanliness of the system while maintaining low airflow resistance and low noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0028] Figure 1 A schematic structural diagram of a cyclone guide for a range hood provided in an embodiment of the present application;

[0029] Figure 2 for Figure 1 Schematic diagram of the assembly structure of the middle throat pipe and the guide cone;

[0030] Figure 3 for Figure 1 Schematic diagram of the structure of the contraction tube and the expansion tube;

[0031] Figure 4 for Figure 1 Schematic diagram of the structure of the middle exhaust pipe;

[0032] Figure 5 A schematic structural diagram of a range hood provided in an embodiment of the present application;

[0033] Figure 6 for Figure 5 A schematic structural diagram of an array type cyclone guide;

[0034] Figure 7 for Figure 6 A structural diagram from another perspective.

[0035] Description of reference numerals:

[0036] 1. Throat; 2. Converging tube; 21. Inlet channel; 22. Second blade; 23. Front cover; 3. Expanding tube; 31. Separation hole; 32. Exhaust channel; 33. Rear cover; 4. Guide cone; 41. Nozzle; 5. First blade; 6. Injection pipe; 7. Exhaust pipe; 71. Slit;

[0037] 10. Cyclone guide; 101. Front cover platform; 102. Rear cover platform; 103. Oil storage cavity; 20. Box; 30. Smoke collection chamber; 40. Pipeline assembly; 401. Main pipeline; 402. Branch pipeline. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0040] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0041] In order to solve the common systemic defects of the existing technology, such as insufficient capture efficiency of small-size and low-kinetic energy particles, complicated high-speed mechanical structure, and high maintenance cost of filter material clogging, which lead to technical problems such as high oil fume escape rate and insufficient equipment reliability in scenarios with high purification requirements, the present application provides a cyclone guide and range hood for range hoods, which have a breakthrough integration of physical centrifugal separation and chemical absorption enhancement mechanism, and while maintaining low airflow resistance and low noise, simultaneously improve the capture efficiency of small-particle oil fume and the long-term cleanliness of the system.

[0042] See also Figures 1 to 4 The embodiment of the present application provides a cyclone guide 10 for a range hood, comprising: a throat 1; a contraction tube 2 connected to the front end of the throat 1; an expansion tube 3 connected to the rear end of the throat 1, with a separation hole 31 opened on the side wall of the expansion tube 3; a guide cone 4 arranged at the center of the throat 1, with a nozzle 41 provided inside the guide cone 4; a plurality of first blades 5, the inner side of which is fixedly connected to the outer surface of the guide cone 4 and the outer side is connected to the inner wall of the throat 1; and an injection pipeline 6 connected to the nozzle 41 to provide an absorbent to the nozzle 41.

[0043] Specifically, the flue gas is sucked into the throat 1 from the contraction tube 2, and generates a tangential velocity through the first blade 5 fixed between the guide cone 4 and the inner wall of the throat 1, thereby being forced to guide to form a high-speed vortex and a huge centrifugal field; then, the nozzle 41 inside the guide cone 4 is connected to the absorbent (such as atomized liquid) through an independent injection pipeline 6 (a high-pressure pipeline is used in this embodiment), and continuously sprays toward the core area of ​​the air flow to form a negative pressure zone, so that the suction force at the inlet of the cyclone guide 10 is enhanced, and after the oil fume particles are fully mixed with it, the particle size further grows; due to the difference in density between the oil fume particles and the air, and the oil fume-containing air flow moves toward the periphery due to the centrifugal force in the expansion tube 3, the oil fume particles with higher density are separated to the outer wall of the throat 1, flow to the vicinity of the inner wall of the downstream expansion tube 3, and are discharged through the separation hole 31 opened in the expansion tube 3, while the purified gas flows out from the end.

[0044] Furthermore, in order to ensure the improvement of the separation capacity of the cyclone guide 10 and avoid the increase of flow resistance due to too many blades, the number of first blades 5 in this embodiment is 3-10, and the blades are spiral-shaped. They are connected between the outer wall of the guide cone 4 and the inner wall of the throat 1 in a circumferentially uniform manner to form a stable and continuous airflow guiding channel, wherein the lower limit of the number of blades (≥3 blades) ensures the generation of sufficient centrifugal vortices to achieve efficient separation of oil and fat, and the upper limit (≤10 blades) effectively suppresses the airflow disturbance and increased pressure loss caused by the excessively high blade density.

[0045] To sum up, the present application adopts high-pressure airflow injection, combined with the acceleration effect of the convergent flow channel (contraction tube 2) and the guide cone 4, to accelerate the growth of the particle size, greatly increase the airflow velocity, and induce rotation through the first blade 5 to generate a strong centrifugal force field, which has a separation ability far stronger than the original folding plate collision separation technology, and improves the interception ability and filtration purification performance of the oil suction press; compared with the filtering separation method, the structure has a strong flow capacity, a low pressure drop, the flow channel is not easy to be blocked, does not require regular material replacement, and the system maintenance cost is low, which reduces the flow resistance of the range hood and the operating speed of the downstream centrifugal fan, and helps to reduce the energy consumption and working noise of the range hood; at the same time, the high-pressure jet in the injection pipe 6 can enhance the suction force of the oil suction press inlet, and the absorbent contained inside can react with the oil fume particles to prevent grease from adhering to the surface of the air duct system during long-term operation, thereby improving the long-term operation reliability of the equipment.

[0046] like Figure 1 and Figure 3 As shown, the shrink tube 2 is provided with an air inlet channel 21 , and the cross-sectional areas of the air inlet channel 21 are arranged from large to small.

[0047] Specifically, the inlet passage 21 of the contracting tube 2 features a tapered cross-section (the cross-sectional area decreases continuously along the airflow direction). This gradually accelerates the flue gas entering the throat pipe 1, creating a uniform, directional, and high-speed inflow. This reduces pressure and increases particle size. This tapered structure creates a natural compression effect on the flue gas, increasing the initial velocity of the airflow and laying the kinetic energy foundation for swirl generation within the throat pipe 1, without the need for external power.

[0048] like Figure 1 and Figure 3 As shown, a plurality of second blades 22 are provided at the front end of the shrink tube 2 , and the outer sides of the second blades 22 are fixedly connected to the inner wall of the shrink tube 2 .

[0049] Specifically, the number of the second blades 22 is set to be the same as the number of the first blades 5. By adding the second blades 22 at the front end of the contraction tube 2, each blade is distributed circumferentially and its outer edge is directly and rigidly fixed to the inner wall of the contraction tube 2. A through-type flow channel is formed between the blades to guide the airflow axially into the contraction channel. When the flue gas is sucked into the inlet of the contraction tube 2 under the action of atmospheric pressure, a tangential component velocity will be generated through the second blade 22 (induction blade), which promotes the mixing of the flue gas and intensifies the aggregation effect of the oil fume particles.

[0050] Furthermore, the second blades 22 cooperate with the first blades 5 arranged on the guide cone 4 to prevent the airflow from directly impacting the blades and causing significant pressure losses. The second blades 22 pre-rectify the inflowing gas at the front end of the contracting tube 2, precisely matching its flow direction with the swirl inlet angle of the first blades 5 on the guide cone 4. This forms a coherent, graded flow-guiding structure and prevents sudden changes in flow direction in the cascade area.

[0051] like Figure 3 As shown, the expansion tube 3 is provided with an exhaust channel 32, and the cross-sectional areas of the exhaust channel 32 are arranged from small to large.

[0052] Specifically, the exhaust passage 32 of the expansion tube 3 employs a progressively expanding cross-section (the cross-sectional area continuously expands from small to large along the airflow direction). This allows the high-speed swirling airflow to gradually decelerate and expand after passing through the separation aperture 31, ultimately delivering the purified gas smoothly. This progressively expanding structure converts the airflow's rotational kinetic energy into static pressure energy, effectively restoring system pressure and reducing the range hood's fan energy consumption. Furthermore, during the airflow deceleration process, residual microparticles migrate further toward the tube wall due to inertia, thereby enhancing separation efficiency.

[0053] like Figure 3-4 As shown, an exhaust pipe 7 is further provided inside the expansion tube 3 . The exhaust pipe 7 has the same shape as the expansion tube 3 , but a volume of the exhaust pipe 7 is smaller than that of the expansion tube 3 , and a gap 71 is formed between the exhaust pipe 7 and the expansion tube 3 .

[0054] Specifically, a smaller exhaust pipe 7 is coaxially nested within the expansion tube 3. The two have identical geometric shapes but differ in size, forming an annular gap 71. Purified gas is discharged from the end of exhaust pipe 7, while the swirling flow containing grease is confined to the space between gap 71 and the outer wall of the expansion tube 3. Gap 71 constrains the swirling gas to move closely against the outer wall of the expansion tube 3, maintaining high centrifugal strength until it reaches the separation aperture 31, preventing premature diffusion of the airflow and the resulting degradation of separation efficiency. Furthermore, exhaust pipe 7 allows only the purified gas in the central region to pass through, while residual grease particles are secondary blocked by the throttling effect of gap 71, ensuring the cleanliness of the output gas.

[0055] like Figure 1 and Figure 3 As shown, the nozzles 41 are distributed in a circular pattern on the top of the guide cone 4 , the angle between the direction of the nozzles 41 and the axis of the guide cone 4 is an acute angle, and the nozzles 41 are tilted on the radial plane of the guide cone 4 .

[0056] Specifically, to enhance airflow guidance, nozzles 41 are arranged circumferentially, with their orientation forming an acute angle with the axis of guide cone 4. This ensures that the airflow not only generates a circumferential velocity component but also an axial velocity component consistent with the flow direction. Furthermore, nozzles 41 are also angled radially to generate a radial velocity component, forming a rotating high-speed jet that enhances the interception of oil smoke particles.

[0057] like Figure 1 and Figure 3 As shown, the separation holes 31 are rectangular in shape, and there are a plurality of separation holes 31 , which are distributed in an array on the side wall of the expansion tube 3 .

[0058] Specifically, the separation holes 31 adopt a rectangular geometry and are densely arranged in an array throughout the sidewall of the expansion tube 3, forming a regular array covering the outer periphery of the expansion tube 3. The long sides of the rectangles extend axially along the expansion tube 3, maximizing the capture of liquid grease thrown onto the tube wall by centrifugal force, while avoiding the grease retention caused by surface tension in traditional small-diameter circular holes. Furthermore, the array-like distribution ensures that the separation holes 31 fully cover the expansion tube 3, evenly releasing the circumferential pressure gradient and preventing local eddy current regeneration from interfering with the centrifugal field.

[0059] See also Figures 5 to 7 A range hood provided in an embodiment of the present application includes: a housing 20, a smoke collecting chamber 30, and several cyclone guides 10 for the range hood as in the above embodiment. The housing 20 is connected to the smoke collecting chamber 30, and the several cyclone guides 10 are arranged in a rectangular array at the inlet end of the air duct and installed in the smoke collecting chamber 30.

[0060] Specifically, the range hood features a densely arranged rectangular array of cyclone guides 10 at the air duct inlet of the smoke collection chamber 30. Each cyclone guide 10 operates independently and forms a modular assembly structure with the housing 20 and smoke collection chamber 30. This rectangular array arrangement evenly covers the inlet cross-section of the smoke collection chamber 30, helping to reduce the airflow rotation radius, increase the centrifugal field strength, eliminate dead zones for fume inhalation, and ensure the simultaneous and efficient capture of fume escaping from the cooking area. The array layout evens out airflow distribution within the smoke collection chamber 30, suppressing localized high-speed vortices, minimizing fume escape, and reducing system turbulent noise. The modular design allows for independent disassembly and cleaning of each guide, significantly reducing the complexity of long-term equipment maintenance.

[0061] like Figure 6-7 As shown, a front cover plate 23 is provided at the front end of the contraction tube 2, and a rear cover plate 33 is provided at the end of the expansion tube 3. Several front cover plates 23 are spliced ​​together to form a front cover plate platform 101, and several rear cover plates 33 are spliced ​​together to form a rear cover plate platform 102; the front cover plate platform 101 is installed at the front end of the smoke collecting chamber 30, and the rear cover plate platform 102 is installed at the front end of the smoke outlet of the box body 20. The front cover plate platform 101, the rear cover plate platform 102 and the outer wall of the cyclone guide 10 are formed with an oil storage cavity 103, and the oil storage cavity 103 is connected to the through hole on the side wall of the smoke collecting chamber 30.

[0062] Specifically, the front covers 23 of the multiple cyclone guides 10 are assembled into an integral front cover platform 101 fixed to the front end of the smoke collecting chamber 30, while the rear covers 33 are assembled into an integral rear cover platform 102 fixed to the front end of the smoke outlet of the box 20; the outer walls of each guide and the front and rear cover platforms 102 together enclose a continuous oil storage cavity 103, which is connected to the external oil circuit through a through hole in the side wall of the smoke collecting chamber 30. The oil storage cavity 103 can be seamlessly integrated to separate oil from all guides, eliminating the risk of dripping caused by traditional split oil cups and realizing the integration of "separation-collection-diversion"; at the same time, the closed cavity structure prevents oil from splashing back into the smoke collecting chamber 30, maintaining a hygienic cooking environment.

[0063] like Figure 6-7 As shown, the range hood also includes a pipe assembly 40, which includes a main pipe 401 and several branch pipes 402. The main pipe 401 is connected to the several branch pipes 402, and the several branch pipes 402 are respectively connected to the injection pipes 6 in several cyclone guides 10. The main pipe 401 is connected to an external liquid supply device.

[0064] Specifically, the main line 401 is directly connected to an external liquid supply device and, through several branch lines 402, independently connected to the injection lines 6 of each cyclone introducer 10, forming a tree-like liquid distribution network. This enables the simultaneous distribution and delivery of absorbent from a single liquid supply source to multiple introducers. This tree-like piping architecture ensures uniform distribution of absorbent to all introducer nozzles 41, eliminating local separation performance fluctuations caused by flow deviations in multi-unit systems.

[0065] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0066] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0068] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0069] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0070] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0071] Obviously, those skilled in the art may make various modifications and variations to this application without departing from the spirit and scope of this application. Thus, as long as these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

[0072] The above description is a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and such modifications or substitutions should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A cyclone guide for a range hood, characterized in that: include: throat; A shrink tube connected to the front end of the throat; An expansion tube connected to the rear end of the throat tube, wherein a separation hole is opened on the side wall of the expansion tube; A guide cone is arranged at the center of the throat, and a nozzle is provided inside the guide cone; a plurality of first blades, the inner sides of which are fixedly connected to the outer surface of the guide cone and the outer sides of which are connected to the inner wall of the throat pipe; A spray line is connected to the nozzle to supply absorbent to the nozzle.

2. The cyclone guide for a range hood according to claim 1, characterized in that: The shrink tube is provided with an air inlet channel, and the cross-sectional areas of the air inlet channel are arranged from large to small.

3. The cyclone guide for a range hood according to claim 2, characterized in that: A plurality of second blades are provided at the front end of the shrinkable tube, and outer sides of the second blades are fixedly connected to the inner wall of the shrinkable tube.

4. The cyclone guide for a range hood according to claim 1, characterized in that: The expansion tube is provided with an exhaust channel, and the cross-sectional areas of the exhaust channel are arranged from small to large.

5. The cyclone guide for a range hood according to claim 4, characterized in that: An exhaust pipe is further provided inside the expansion pipe. The exhaust pipe has the same shape as the expansion pipe, the volume of the exhaust pipe is smaller than the volume of the expansion pipe, and a gap is formed between the two.

6. The cyclone guide for a range hood according to claim 1, characterized in that: The nozzles are distributed in a circular pattern on the top of the guide cone, the angle between the nozzle direction and the axis of the guide cone is an acute angle, and the nozzles are arranged obliquely on the radial plane of the guide cone.

7. The cyclone guide for a range hood according to claim 1, characterized in that: The separation holes are rectangular in shape, and there are a plurality of separation holes, which are distributed in an array on the side wall of the expansion tube.

8. A range hood, characterized in that: include: A box body, a smoke collecting chamber and several cyclone guides for a range hood as described in any one of claims 1 to 7, wherein the box body is connected to the smoke collecting chamber, and the several cyclone guides are arranged in a rectangular array at the inlet end of the air duct and installed in the smoke collecting chamber.

9. The range hood according to claim 8, characterized in that: The front end of the shrink tube is provided with a front cover plate, the end of the expansion tube is provided with a rear cover plate, a plurality of the front cover plates are spliced ​​together to form a front cover plate platform, and a plurality of the rear cover plates are spliced ​​together to form a rear cover plate platform; The front cover platform is installed at the front end of the smoke collecting chamber, and the rear cover platform is installed at the front end of the smoke outlet of the box body. The front cover platform, the rear cover platform and the outer wall of the cyclone guide form an oil storage cavity, and the oil storage cavity is connected to the through hole of the side wall of the smoke collecting chamber.

10. The range hood according to claim 8, characterized in that: It also includes a pipeline assembly, which includes a main pipeline and several branch pipelines. The main pipeline is connected to the several branch pipelines, and the several branch pipelines are respectively connected to the injection pipelines in several cyclone guides. The main pipeline is connected to an external liquid supply device.

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