Exhaust fume collecting hood and range hood comprising same
By setting guide sections and guide protrusions or depressions on the smoke collection hood of the range hood, the airflow path is optimized, which solves the problem of low aerodynamic efficiency of the butterfly-wing ring suction plate under high smoke volume, improves the smoke collection capacity and operating efficiency, and reduces noise.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-04-03
AI Technical Summary
In existing range hoods, the butterfly-wing suction plate has poor aerodynamic efficiency under high oil fume conditions, resulting in increased noise and oil fume escape, making it difficult to meet the high air volume performance requirements of modern kitchens.
A guide section is set at the edge of the smoke hood's annular suction plate. The guide section forms a guide channel with the inner wall of the air duct. Guide protrusions or depressions are set on the surface of the guide section to optimize the airflow path, reduce the vortex area and intake resistance, and improve the airflow entry efficiency.
The design of the airflow guide and its protrusions or recesses improves the oil fume capture capacity and operating efficiency, reduces noise, and enhances the suction power and overall smoke extraction effect of the range hood.
Smart Images
Figure CN224080270U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of smoke collection hood technology, and in particular to a smoke collection hood and a range hood containing the same. Background Technology
[0002] When a range hood is working, the motor drives the impeller to rotate at high speed, creating a negative pressure zone around the air intake. This negative pressure environment generates an upward airflow at a certain speed, causing the cooking fume particles to be quickly drawn into the smoke collection chamber of the machine under the combined effects of the Bernoulli effect and the static pressure gradient effect. In existing range hoods, to increase the area of the negative pressure zone and improve smoke extraction efficiency, a butterfly-shaped suction plate is usually added near the air intake.
[0003] However, in actual use, it was found that when the amount of oil fumes increases sharply, the butterfly-wing suction plate is unable to build an effective suction flow field. This not only significantly increases the noise during operation, affecting the user experience, but also causes oil fumes to escape, which seriously restricts the high air volume performance requirements of modern kitchens for range hoods. Utility Model Content
[0004] The technical problem to be solved by this utility model is to overcome the defect of poor aerodynamic efficiency at the butterfly-wing ring suction plate in the prior art, and to provide a smoke collection hood and a range hood containing the hood.
[0005] The present invention solves the above-mentioned technical problems through the following technical solution:
[0006] A smoke collection hood, comprising a ring suction plate, an air inlet, and an air duct communicating with the air inlet, and further comprising:
[0007] The guide portion extends from the edge of the annular suction plate toward the inside of the air duct. The guide portion and the inner wall of the air duct form a guide channel. The surface of the guide portion toward the air duct is provided with guide protrusions or guide depressions.
[0008] In this design, a guide section is incorporated, forming a flow channel between the guide section and the air duct. This channel guides the oil fumes from the edge of the suction plate, reducing the vortex zone at the edge of the suction plate and lowering the air intake resistance. This improves air intake efficiency and consequently enhances the smoke collection capacity of the smoke hood. Furthermore, the guide section features non-smooth surface protrusions or recesses, allowing airflow to enter the smoke hood more smoothly and efficiently compared to a smooth surface, thus improving the overall smoke extraction effect and operational efficiency.
[0009] Preferably, the flow guide is disposed in the middle region of the edge of the annular suction plate, the cross-section of the flow guide is an arc-shaped structure, and the thickness of the flow guide is the same as the thickness of the annular suction plate.
[0010] In this solution, the above-mentioned settings are used to improve the airflow guiding effect in the middle region where the airflow velocity is faster, while ensuring the structural strength of the guide section.
[0011] Preferably, there are three flow guides, one of which is located at the edge of the annular suction plate along its length, and the central angle corresponding to the arc length of the flow guide located at the edge of the annular suction plate along its length is 75°-105°.
[0012] In this solution, the above settings ensure the extension dimension of the guide section and effectively guide the airflow along the edge of the annular suction plate in the length direction.
[0013] Preferably, the radius of the central angle corresponding to the guide portion located at the edge of the annular suction plate along its length is 40-50 mm.
[0014] In this solution, the above-mentioned settings are used to ensure the distance between the guide section and the inner wall of the air duct, thereby reducing the vortex at that location.
[0015] Preferably, the other two flow guides are disposed at the edge of the annular suction plate in the width direction, and the central angle corresponding to the arc length of the flow guide located at the edge of the annular suction plate in the width direction is 45°-75°.
[0016] In this solution, the above settings ensure the extension dimension of the guide section at the edge of the annular suction plate in the width direction, effectively guiding the airflow at the edge of the annular suction plate in the width direction.
[0017] Preferably, the radius of the central angle corresponding to the guide portion located at the edge of the annular suction plate in the width direction is 45-50mm.
[0018] In this solution, the above-mentioned settings are used to ensure the distance between the guide section and the inner wall of the air duct, thereby reducing the vortex at that location.
[0019] Preferably, the flow guiding protrusion or the flow guiding recess is a hemispherical structure, and multiple sets of the flow guiding protrusion or the flow guiding recess are arranged in an array along the width direction of the flow guiding portion.
[0020] In this solution, the above settings ensure smoother airflow across the surface of the guide section and reduce the boundary separation effect that may occur on the surface of the guide section.
[0021] Preferably, each group of the flow-guiding protrusions or flow-guiding recesses is spaced apart along the length direction of the flow-guiding portion, and the number is 8-15.
[0022] In this solution, the above settings ensure that the airflow is smoother as it passes through various positions on the surface of the guide section.
[0023] Preferably, the radius of the guide protrusion or the guide recess is 4-8 mm.
[0024] In this solution, the above-mentioned settings are used to avoid the excessive size of the guide protrusions or recesses, which would create flow resistance to the airflow.
[0025] A range hood, the range hood comprising a smoke collection hood as described above.
[0026] In this design, the range hood includes the aforementioned smoke collection hood, which guides the fumes through a guide section, creating an airflow guiding structure within the duct. Furthermore, to mitigate potential boundary layer separation effects near the guide section, guide protrusions or recesses are added to its surface. This allows the airflow to enter the range hood smoothly and efficiently, thereby improving the overall smoke extraction effect and operational efficiency.
[0027] The positive and progressive effects of this invention are as follows: By setting up a guide section, a guide channel is formed between the guide section and the air duct, which guides the oil fumes from the edge of the ring suction plate, reduces the vortex area at the edge of the ring suction plate, lowers the air intake resistance at the edge of the ring suction plate, and improves the air intake efficiency, thereby correspondingly improving the smoke collection capacity of the smoke hood. In addition, the guide section is provided with non-smooth plane guide protrusions or guide depressions, which allow the airflow to enter the smoke hood more smoothly and efficiently than a smooth plane, thereby improving the overall smoke extraction effect and operating efficiency. Attached Figure Description
[0028] Figure 1 This is a perspective view of a range hood according to a preferred embodiment of the present invention.
[0029] Figure 2 This is a diagram showing the positional relationship between the annular suction plate and the guide portion in a preferred embodiment of the present invention.
[0030] Figure 3 This is a schematic diagram of the flow guide portion at the width edge of the annular suction plate according to a preferred embodiment of the present invention.
[0031] Figure 4 This is a schematic diagram of the flow guide portion at the length edge of the annular suction plate in a preferred embodiment of the present invention.
[0032] Figure 5 This diagram shows the positional relationship between the flow channel and the air duct in a preferred embodiment of the present invention.
[0033] Explanation of reference numerals in the attached figures:
[0034] Smoke hood 10
[0035] Circular suction plate 1
[0036] Air Inlet 2
[0037] Air duct 3
[0038] Flow guide 4
[0039] Flow channel 41
[0040] 5-channel guide protrusion Detailed Implementation
[0041] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.
[0042] This embodiment provides a smoke collection hood 10, the specific structure of which is as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the smoke hood 10 is equipped with a ring suction plate 1, an air inlet 2, and an air duct 3 communicating with the air inlet 2. The smoke hood 10 also includes:
[0043] The guide section 4 extends from the edge of the annular suction plate 1 toward the inside of the air duct 3. The guide section 4 and the inner wall of the air duct 3 form a guide channel 41. The surface of the guide section 4 facing the air duct 3 is provided with a guide protrusion 5 or a guide recess (not shown in the figure).
[0044] Specifically, the guide section 4 is a plate material. One end of the guide section 4 is fixedly connected to the edge of the annular suction plate 1, and the other end of the guide section 4 extends towards the inside of the air duct 3. The extension direction of the guide section 4 is the same as the air intake direction of the air duct 3. The guide section 4 and the inner wall of the air duct 3 form a guide channel 41. By setting the guide section 4, the airflow entering the air inlet 2 is guided. When the airflow flows inside the air duct 3, due to the difference in flow paths between the guide channel 41 and the air duct 3, a certain pressure gradient is formed between the airflow near the inner wall of the guide channel 41 and the airflow away from the inner wall of the guide channel 41. This pressure gradient causes the airflow to move towards the air duct 3, thereby effectively improving the guiding efficiency and reducing energy loss. On this basis, the airflow velocity increases after passing through the annular suction plate 1 and entering the air duct 3 above the annular suction plate 1, and the velocity gradient becomes more uniform. The original vortex area also disappears. Meanwhile, based on the Venturi effect, the airflow is restricted by the guide channel 41. As the airflow passes through the cross-section of the guide channel 41, which gradually narrows, the flow velocity increases significantly, while the pressure decreases accordingly, thus increasing the pressure difference between the inside and outside of the fume hood 10. This effect can further enhance the airflow's suction capacity and improve the efficiency of fume collection. The pressure inside the fume hood 10 is much lower than that inside a traditional fume hood, which helps to increase the pressure gradient inside the fume hood 10, thereby increasing the suction power and fume collection capacity of the range hood. According to the airflow distribution simulation analysis in the prior art, after the fumes enter the fume hood 10 from the outside, under the action of the pressure gradient, the vortex area on the side of the edge of the annular suction plate 1 away from the inner wall of the air duct 3 is effectively reduced, while the intake resistance is reduced, avoiding energy loss and a decrease in guide efficiency. In other words, compared with a fume hood 10 without a guide section 4, the fume collection capacity of the fume hood 10 is correspondingly improved. It should be noted that airflow distribution simulation is an existing technology, and this embodiment has not improved upon it, so it will not be elaborated on further here.
[0045] In this embodiment, non-smooth surface guide protrusions 5 or guide depressions are provided on the surface of the guide section 4. Compared with a smooth surface guide section 4, the guide protrusions 5 or guide depressions reduce the boundary layer separation effect that may occur near the surface of the guide section 4, allowing the airflow to enter the smoke hood 10 more smoothly and efficiently, thereby improving the overall smoke extraction effect and operating efficiency. Furthermore, under the combined effect of the guide section 4 and the guide protrusions 5 or guide depressions, the turbulence intensity at the end of the duct 3 is significantly reduced, overcoming the problem of traditional smoke hoods easily forming turbulence zones under the combined effects of wall adhesion and pressure gradients. Since the magnitude of aerodynamic noise is positively correlated with the intensity of turbulence, the reduction in turbulence effectively reduces aerodynamic noise.
[0046] In this embodiment, the flow guide 4 is disposed in the middle region of the edge of the annular suction plate 1. The cross-section of the flow guide 4 is an arc-shaped structure, and the thickness of the flow guide 4 is the same as the thickness of the annular suction plate 1.
[0047] Specifically, the guide section 4 is an arc-shaped plate extending into the air duct 3 and forming a guide channel 41 with the inner wall of the air duct 3. Simultaneously, the end of the guide section 4 that connects to the annular suction plate 1 is located in the middle region of the edge of the annular suction plate 1. Compared to the off-center region of the guide section 4, which is closer to the edge of the annular suction plate 1, the airflow through the middle region of the annular suction plate 1 is greater. Therefore, by positioning the guide section 4 in the middle region where the airflow velocity is faster, the guiding effect is improved. Furthermore, to prevent the guide section 4 from deforming under the influence of airflow and to avoid turbulence, the thickness of the guide section 4 is set to be the same as the thickness of the annular suction plate 1 to improve the structural strength of the guide section 4. In this embodiment, the guide section 4 is manufactured using sheet metal processing technology. After sheet metal processing, the guide section 4 is fixedly connected to the annular suction plate 1, or the guide section 4 and the annular suction plate 1 are integrally formed. A sheet metal area is reserved for the guide section 4, and sheet metal processing is performed to manufacture the guide section 4. This is prior art and will not be elaborated further here.
[0048] In this embodiment, three flow guides 4 are provided, one of which is located at the edge of the annular suction plate 1 along its length. The central angle corresponding to the arc length of the flow guide 4 located at the edge of the annular suction plate 1 along its length is 75°-105°.
[0049] Specifically, the central angle corresponding to the arc length of the guide portion 4 located at the length edge of the annular suction plate 1 has one side extending vertically from the length edge of the annular suction plate 1 to the center of the central angle, and the other side extending away from the length edge of the annular suction plate 1 to the center of the central angle. The angle between the two sides is 75°-105°, thereby ensuring the extension dimension of the guide portion 4 located at the length edge of the annular suction plate 1 and effectively guiding the airflow at the length edge of the annular suction plate 1.
[0050] Furthermore, in this embodiment, the radius of the central angle corresponding to the guide portion 4 located at the edge of the annular suction plate 1 along its length is 40-50mm.
[0051] Specifically, the radius of the central angle corresponding to the guide section 4 located at the edge of the annular suction plate 1 along its length is the length of the two sides of the central angle. By limiting the radius of the central angle, the relative position between the guide section 4 and the inner wall of the air duct 3 is located. According to the airflow distribution simulation analysis in the prior art, the guide section 4 located at the edge of the annular suction plate 1 along its length can effectively reduce the vortex at that location within the above-mentioned size range.
[0052] In this embodiment, two additional guide portions 4 are disposed on the edge of the annular suction plate 1 in the width direction, and the central angle corresponding to the arc length of the guide portion 4 located on the edge of the annular suction plate 1 in the width direction is 45°-75°.
[0053] Specifically, the central angle corresponding to the arc length of the guide portion 4 located at the width edge of the annular suction plate 1 has one side extending vertically from the width edge of the annular suction plate 1 to the center of the central angle, and the other side extending away from the width edge of the annular suction plate 1 to the center of the central angle. The angle between the two sides is 45°-75°, thereby ensuring the extension dimension of the guide portion 4 located at the width edge of the annular suction plate 1 and effectively guiding the airflow at the width edge of the annular suction plate 1. There are two guide portions 4 arranged opposite each other at the width edge of the annular suction plate 1, and each width edge of the annular suction plate 1 is provided with a guide portion 4. That is, three guide portions 4 are arrayed in different directions of the annular suction plate 1, which optimizes the streamline shape inside the smoke hood 10 and constructs a streamlined airflow guiding structure around the air duct 3, improving aerodynamic performance.
[0054] Furthermore, in this embodiment, the radius of the central angle corresponding to the guide portion 4 located at the edge of the width direction of the annular suction plate 1 is 45-50mm.
[0055] Specifically, the radius of the central angle corresponding to the guide portion 4 located at the edge of the width direction of the annular suction plate 1 is the length of the two sides of the central angle. By limiting the radius of the central angle, the relative position between the guide portion 4 and the inner wall of the air duct 3 is located. According to the airflow distribution simulation analysis in the prior art, the guide portion 4 located at the edge of the width direction of the annular suction plate 1 can effectively reduce the vortex at that location within the above-mentioned size range.
[0056] In this embodiment, the flow guiding protrusion 5 or the flow guiding recess is a hemispherical structure, and multiple sets of the flow guiding protrusion 5 or the flow guiding recess are arranged in an array along the width direction of the flow guiding part 4.
[0057] Specifically, the guide protrusions 5 or guide recesses are formed on the surface of the guide section 4 using a stamping process in the prior art. The guide protrusions 5 extend towards the inner wall of the air duct 3, while the guide recesses extend away from the inner wall of the air duct 3, thereby forming a non-smooth structure on the surface of the guide section 4. This reduces the boundary layer separation effect that may occur on the surface of the guide section 4, ensuring smoother airflow when passing over the surface of the guide section 4. Multiple sets of guide protrusions 5 or guide recesses are arranged in an array along the width direction of the guide section 4 to effectively guide the airflow at different positions of the guide section 4, avoiding local surface flatness that would affect the airflow velocity.
[0058] Furthermore, in this embodiment, each group of guide protrusions 5 or guide recesses is spaced apart along the length direction of the guide portion 4, and the number is 8-15.
[0059] Specifically, the length of the guide section 4 is the arc length of the curved plate. By setting 8-15 guide protrusions 5 or guide recesses at intervals, the airflow can be made smoother when it flows through various positions on the surface of the guide section 4 along its length.
[0060] In this embodiment, the radius of the guide protrusion 5 or the guide recess is 4-8 mm. Specifically, the cross-section of the hemispherical structure is semi-circular, and the radius of the semi-circle is 4-8 mm. By limiting the radius of the guide protrusion 5 or the guide recess, the size of the guide protrusion 5 or the guide recess is prevented from being too large and thus generating flow resistance to the airflow.
[0061] This embodiment also provides a range hood, which includes the aforementioned smoke collection hood 10. The range hood guides the fumes through the guide section 4, and an airflow guiding structure is constructed within the air duct 3. Furthermore, to reduce the boundary layer separation effect that may occur near the guide section 4, guide protrusions 5 or guide depressions are added to the surface of the guide section 4. This allows the airflow to enter the range hood smoothly and efficiently, thereby improving the overall smoke extraction effect and operating efficiency.
[0062] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.
Claims
1. A fume hood provided with a ring suction plate, an air inlet and an air duct communicating with the air inlet, characterized in that, The smoke hood further comprises: A flow guide part extending from the edge of the ring-shaped suction plate towards the air duct, the flow guide part and the inner wall of the air duct forming a flow guide channel, and the flow guide part being provided with flow guide protrusions or flow guide recesses on the surface thereof.
2. The hood of claim 1, wherein The flow guide part is arranged at the middle region of the edge of the ring-shaped suction plate, and the cross section of the flow guide part is in an arc shape, and the thickness of the flow guide part is the same as the thickness of the ring-shaped suction plate.
3. The hood of claim 2, wherein The flow guide part is provided with three flow guide parts, one of which is located at the length direction edge of the ring-shaped suction plate, and the central angle of the arc length of the flow guide part located at the length direction edge of the ring-shaped suction plate is 75-105°.
4. The hood of claim 3 wherein, The radius of the central angle of the flow guide part located at the length direction edge of the ring-shaped suction plate is 40-50 mm.
5. The hood of claim 3 wherein, The other two flow guide parts are arranged at the width direction edge of the ring-shaped suction plate, and the central angle of the arc length of the flow guide part located at the width direction edge of the ring-shaped suction plate is 45-75°.
6. The hood of claim 5 wherein, The radius of the central angle of the flow guide part located at the width direction edge of the ring-shaped suction plate is 45-50 mm.
7. The hood of claim 1 wherein, The flow guide protrusions or the flow guide recesses are in a hemispherical structure, and a plurality of groups of the flow guide protrusions or the flow guide recesses are arranged along the width direction of the flow guide part.
8. The hood of claim 7 wherein, Each group of the flow guide protrusions or the flow guide recesses is arranged in intervals along the length direction of the flow guide part, and the number of the flow guide protrusions or the flow guide recesses is 8-15.
9. The hood of claim 7 wherein, The radius of the flow guide protrusions or the flow guide recesses is 4-8 mm.
10. An extractor hood, characterized in that The extractor hood comprises the smoke hood according to any one of claims 1-9.