Oil fume drainage device and double-suction oil fume extractor

Abstract

This invention relates to the field of range hood technology, specifically to a fume diversion device and a dual-suction range hood. The fume diversion device includes: a volute, having an air outlet, an air inlet face, and a mounting face, with the air inlet face and mounting face facing each other and forming an inner cavity between them; at least one flow-blocking groove is provided on the mounting face; the air outlet is located on the side wall of the volute; an impeller, with its axis arranged along the direction from the air inlet face to the mounting face; the impeller is disposed in the inner cavity of the volute, with part of the impeller covering the flow-blocking groove, and an air inlet is provided between the impeller and the flow-blocking groove; in the impeller's operating state, gas is diverted from the impeller sequentially to the air inlet and the flow-blocking groove, then flows back to the impeller, and exits the inner cavity of the volute through the air outlet; this invention, by setting the flow-blocking groove, significantly reduces the amount of gas entering through the air inlet, thereby reducing the amount of gas returning to the impeller, improving impeller performance, and achieving noise reduction.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and in particular to a fume diversion device and a dual-suction range hood. Background Technology

[0002] A range hood, also known as a kitchen exhaust hood, is a kitchen appliance used to purify the kitchen environment. It quickly removes exhaust gases from gas stoves and cooking fumes, venting them outdoors to purify the kitchen. With technological advancements and increased industry competition, consumers have higher requirements for noise levels. As the core power component of a range hood, the design of the fan system directly affects its performance. Noise levels for range hoods are generally assessed under low-resistance operating conditions and user operating conditions. Currently, with the prevalence of high-rise buildings in cities, range hoods need to pass through flues, check valves, and shared flues to exhaust smoke. This results in significant resistance during user operating conditions. Therefore, reducing noise during user operating conditions is one of the main tasks for professionals in this field.

[0003] Typically, range hoods generate noise during operation. The main causes include the motor's operation, the rotation of the impeller, and the impact of the airflow cutting against the inner wall of the volute. The noise level often increases with the improvement of the smoke extraction and filtration effect. Prolonged exposure to high noise levels, which can drown out conversations, can cause irritability, headaches, palpitations, and even seriously affect the user's physical and mental health. Traditional noise reduction methods generally involve setting a low airflow, sacrificing the smoke extraction and filtration effect to achieve low noise, resulting in inefficiency. Achieving noise reduction while maintaining effective smoke extraction and filtration remains a challenge.

[0004] Given the shortcomings of existing technologies, there is an urgent need to research an oil fume diversion device and a dual-suction range hood to solve the above problems. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides an oil fume diversion device and a dual-suction range hood. By setting a flow obstruction groove, the present invention significantly reduces the amount of gas entering through the air inlet, thereby reducing the amount of gas returning to the impeller, improving impeller performance, and achieving noise reduction.

[0006] This invention provides an oil fume diversion device, comprising:

[0007] The volute has an air outlet, an air inlet end face, and a mounting end face. The air inlet end face and the mounting end face are arranged opposite to each other and form an inner cavity of the volute. At least one flow-blocking groove is provided on the mounting end face. The air outlet is located on the side wall of the volute.

[0008] An impeller, the axis of which is arranged along the direction from the air inlet end face to the mounting end face;

[0009] The impeller is disposed in the inner cavity of the volute, and part of the impeller covers the flow obstruction groove. There is an air inlet between the impeller and the flow obstruction groove. When the impeller is in operation, the gas flows from the impeller to the air inlet and the flow obstruction groove in sequence, then flows back to the impeller, and flows out of the inner cavity of the volute through the air outlet.

[0010] Furthermore, the flow-blocking groove is an annular groove.

[0011] Furthermore, the fume diversion device satisfies at least one of the following characteristics:

[0012] There is a gap between the end face of the impeller and the mounting end face, and the length of the gap is 0-3mm;

[0013] The minimum distance between the end face of the impeller and the bottom of the flow-blocking groove is 8-12 mm.

[0014] Furthermore, the minimum distance between the outer diameter of the impeller and the outer side of the flow-blocking groove is not less than 5 mm.

[0015] Furthermore, the mounting end face is provided with a first mounting hole and several noise reduction holes. The first mounting hole is used to mount the drive component, and the drive component can pass through the first mounting hole and be connected to the impeller drive.

[0016] Furthermore, the axis of the impeller is coaxial with the axis of the first mounting hole.

[0017] In another aspect, the present invention also protects a dual-suction range hood, including a drive assembly, a first fume diversion device as described above, and a second fume diversion device as described above;

[0018] The first fume diversion device and the second fume diversion device are symmetrically arranged, and the mounting end face of the first fume diversion device and the mounting end face of the second fume diversion device abut against each other;

[0019] The drive assembly has a first drive end and a second drive end. The first drive end is driven and connected to the impeller of the first fume diversion device, and the second drive end is driven and connected to the impeller of the second fume diversion device.

[0020] Furthermore, it also includes an air outlet assembly, which includes an air outlet shroud, a flow guide assembly, and a connector;

[0021] The exhaust hood is connected to the exhaust outlet of the first fume diversion device and the exhaust outlet of the second fume diversion device via the connector;

[0022] The airflow guiding component is disposed inside the air outlet hood, and the airflow guiding component is used to divide the air outlet hood into a first air outlet area and a second air outlet area; the first air outlet area is connected to the air outlet of the first fume diversion device, and the second air outlet area is connected to the air outlet of the second fume diversion device.

[0023] Furthermore, the flow guiding component includes a first guide slope and a second guide slope. The first end of the first guide slope is connected to the air outlet of the first fume diversion device, and the first end of the second guide slope is connected to the air outlet of the second fume diversion device. The second ends of the first guide slope and the second guide slope gradually approach each other in a direction away from the air outlet until they are connected.

[0024] Furthermore, it also includes a sound-absorbing component, which includes a first sound-absorbing element and a second sound-absorbing element;

[0025] The first fume diversion device and the second fume diversion device are symmetrically arranged on both sides of the sound absorption component;

[0026] Along the radial direction of the flow-blocking groove, a first mounting groove, the flow-blocking groove, and a second mounting groove are sequentially provided on the mounting end face;

[0027] After the first fume diversion device and the second fume diversion device are connected, the two sets of first mounting slots interlock to form a first accommodating space, and the two sets of second mounting slots interlock to form a second accommodating space. The first sound-absorbing component is disposed in the first accommodating space, and the second sound-absorbing component is disposed in the second accommodating space.

[0028] Implementing the embodiments of the present invention has the following beneficial effects:

[0029] This invention, without reducing the impeller height and ensuring the positioning function of the volute for the impeller, sets a flow-blocking groove on the mounting end face of the volute, and provides an air intake between the impeller and the flow-blocking groove. The air intake between the original volute and the impeller is larger than the air intake in this application. This significantly reduces the amount of gas entering through the air intake when the impeller is running, thereby reducing the amount of gas returning to the impeller, and thus improving the internal flow field under high resistance conditions. While ensuring the smoke filtration effect, it improves the impeller performance and achieves the noise reduction function. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the present invention, the accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0031] Figure 1 This is an exploded view of the dual-suction range hood described in this embodiment;

[0032] Figure 2 This is a cross-sectional view of the dual-suction range hood described in this embodiment;

[0033] Figure 3 This is a cross-sectional view of the fume diversion device described in this embodiment;

[0034] Figure 4 This is a structural diagram of the fume diversion device described in this embodiment;

[0035] Figure 5 This is a structural diagram of the second sound-absorbing component in this embodiment;

[0036] Figure 6 This is a structural diagram of the driving component described in this embodiment.

[0037] The corresponding reference numerals in the figure are as follows:

[0038] 1-Fume diversion device; 2-Air outlet assembly; 3-Drive assembly; 4-Sound absorption assembly; 11-Volume casing; 12-Impeller; 21-Air outlet hood; 22-Flow guide assembly; 23-Connector; 31-First drive end; 32-Second drive end; 41-First sound absorption component; 42-Second sound absorption component; 111-Air outlet; 112-Flow obstruction groove; 113-First mounting groove; 114-Second mounting groove; 115-First mounting hole; 116-Silence hole; 117-Second mounting hole; 221-First guide plate; 222-Second guide plate. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0041] To address the shortcomings of existing technologies, this invention, without reducing the impeller height and ensuring the positioning function of the volute for the impeller, provides a flow-blocking groove on the mounting end face of the volute. An air inlet is located between the impeller and the flow-blocking groove. The original air inlet between the volute and the impeller is larger than the air inlet in this application. This significantly reduces the amount of gas entering through the air inlet during impeller operation, thereby reducing the amount of gas returning to the impeller. This improves the internal flow field under high-resistance conditions, enhancing impeller performance and achieving noise reduction while maintaining the smoke filtration effect.

[0042] See appendix Figure 1-6 This embodiment provides an oil fume diversion device, including: a volute 11 having an air outlet 111, an air inlet end face, and an installation end face, the air inlet end face and the installation end face being arranged opposite each other and forming an inner cavity of the volute, and at least one flow-blocking groove 112 being provided on the installation end face; the air outlet 111 being located on the side wall of the volute 11; an impeller 12 having its axis arranged along the direction from the air inlet end face to the installation end face; the impeller 12 being disposed in the inner cavity of the volute, with a portion of the impeller 12 covering the flow-blocking groove 112, and an air inlet being provided between the impeller 12 and the flow-blocking groove 112; in the operating state of the impeller 12, gas is sequentially diverted from the impeller 12 to the air inlet and the flow-blocking groove 112 and then flows back to the impeller 12, and flows out of the inner cavity of the volute through the air outlet 111.

[0043] It should be noted that in this embodiment, without reducing the height of the impeller 12 and ensuring the positioning function of the volute 11 for the impeller 12, a flow-blocking groove 112 is provided on the mounting end face of the volute 11. There is an air intake between the impeller 12 and the flow-blocking groove 112. The original air intake between the volute and the impeller is larger than the air intake in this application. This makes the amount of gas entering through the air intake significantly reduced when the impeller 12 is running, thereby reducing the amount of gas returning to the impeller, and thus improving the internal flow field under high resistance conditions. While ensuring the smoke filtration effect, the performance of the impeller 12 is improved, and the noise reduction function is achieved.

[0044] Specifically, an air inlet is provided on the air inlet end face, and the gas flows into the inner cavity of the volute through the air inlet.

[0045] In this embodiment, when the impeller 12 is in operation, a low-pressure area is formed in the area where the impeller 12 is located, and a high-pressure area is formed between the impeller 1 and the side wall of the volute 11. The gas entering from the air inlet on the air inlet end face flows to the high-pressure area after passing through the low-pressure area, and flows out of the inner cavity of the volute through the air outlet 111 which is connected to the high-pressure area.

[0046] Furthermore, some gas flows sequentially from the low-pressure region of the impeller 12 to the high-pressure region, the air inlet, and the flow-blocking groove 112, then flows back to the low-pressure region where the impeller 12 is located, and flows back to the high-pressure region, and then flows out of the volute cavity through the air outlet 111; another part of the gas flows from the low-pressure region of the impeller 12 to the high-pressure region, and flows out of the volute cavity through the air outlet 111. By setting the flow-blocking groove 112, the amount of gas flowing back to the impeller can be reduced, the performance of the impeller 12 can be improved, and the noise reduction function can be achieved.

[0047] In some possible embodiments, the flow obstruction groove 112 is an annular groove, so that the air inlet between the volute 11 and the impeller 12 is annular, thereby ensuring that the air inlets around the impeller 12 are all smaller than the air inlets of the existing volute and impeller components, further reducing the amount of gas entering the air inlet, improving the performance of the impeller 12, and achieving the function of noise reduction.

[0048] Specifically, the bottom of the flow obstruction groove 112 is provided with a second mounting hole 117, and the volute 11 is detachably connected to the adjacent volute 11 through the second mounting hole 117.

[0049] Preferably, the flow-blocking groove 112 is provided with four second mounting holes 117 at intervals.

[0050] Specifically, the connection area between the outer diameter of the flow obstruction groove 112 and the mounting end face of the volute 11 adopts a variable curvature arc design, with the curvature gradually increasing towards the annular wall of the volute 11, which can reduce the resistance of the air outlet at the bottom of the impeller 12.

[0051] It should be noted that in the existing technology, when the range hood is running, a low-pressure area is formed in the area where the impeller is located, and a high-pressure area is formed between the side wall of the impeller and the side wall of the volute. A reverse flow channel is formed between the end face of the impeller and the end face of the volute. The gas in the high-pressure area will enter the impeller through the reverse flow channel. This will cause a decrease in impeller efficiency and a disturbance in the flow field at the air inlet of the impeller, affecting the impeller performance and increasing noise.

[0052] In this embodiment, the air inlet and the flow-blocking groove 112 can be defined as a reverse flow channel. Gas from the high-pressure area can enter the air inlet of the impeller 12 through the reverse flow channel, forming a reverse flow. When the impeller 12 is running, the flow-blocking groove 112 can obstruct the reverse flow, blocking most of it and reducing its size. Furthermore, due to the design of the flow-blocking groove 112—specifically, the limitations on its structure and dimensions—even if some reverse flow remains, its path is more tortuous when it enters the groove, resulting in greater losses. Additionally, the vertical design of the inner diameter of the flow-blocking groove 112 guides a smaller amount of secondary flow, allowing it to enter the impeller 12 air inlet in a specific direction within a smaller area, reducing the turbulence range affected by the reverse flow. The combination of these three factors allows for effective control of the reverse flow in the gap between the impeller 12 and the bottom of the volute 11.

[0053] Specifically, the inner diameter of the flow obstruction groove 112 is smaller than the outer diameter of the impeller 12, while the outer diameter of the flow obstruction groove 112 is larger than the outer diameter of the impeller 12.

[0054] In some possible embodiments, the fume diversion device 1 satisfies at least one of the following features: there is a gap between the end face of the impeller 12 and the mounting end face, the length of which is 0-3mm; the minimum distance between the end face of the impeller 12 and the bottom of the flow obstruction groove 112 is 8-12mm. By setting the above parameters, a large amount of gas can be prevented from entering the flow obstruction groove 112 from the air inlet, thereby reducing the amount of gas returning to the impeller, improving the performance of the impeller 12, and achieving the function of noise reduction.

[0055] Specifically, the impeller 12 rotates relative to the volute 11, so there must be a gap between them. The length of the gap can be 0-1mm, 0-2mm, 0-3mm, 1-2mm, 1-3mm or 2-3mm, etc.

[0056] Specifically, the minimum distance between the end face of the impeller 12 and the bottom of the flow obstruction groove 112 is 8-9mm, 8-10mm, 8-11mm, 8-12mm, 9-10mm, 9-12mm, 9-12mm, 10-11mm, 10-12mm or 11-12mm, etc.

[0057] Furthermore, the end face of the impeller 12 refers to the face perpendicular to the axial direction of the impeller 12. Both the mounting end face and the air inlet end face are faces perpendicular to the axial direction of the impeller 12. The end face of the impeller 12 is set parallel to the mounting end face.

[0058] In some possible embodiments, the minimum distance between the outer diameter of the impeller 12 and the outer side of the flow-blocking groove 112 is not less than 5mm. By setting the above parameters, the minimum width of the air intake can be limited, avoiding the air intake width being too small, which would prevent the gas from entering the flow-blocking groove 112 from the air intake. This would lead to the inability to reduce the amount of gas returning to the impeller, improve the performance of the impeller 12, achieve the noise reduction function, and ensure the rotational safety of the impeller 12.

[0059] Preferably, the minimum distance between the outer diameter of the impeller 12 and the outer side of the flow obstruction groove 112 is 5 mm.

[0060] In this embodiment, the gap between the end face of the impeller 12 and the mounting end face is defined as a, the minimum distance between the outer diameter of the impeller 12 and the outer side of the flow obstruction groove 112 is defined as b, the distance between the inner diameter of the impeller 12 and the inner diameter of the flow obstruction groove 112 is defined as c, and the distance between the end face of the impeller 12 and the bottom of the flow obstruction groove 112 is defined as d.

[0061] In some possible embodiments, a first mounting hole 115 and several noise reduction holes 116 are provided on the mounting end face. The first mounting hole 115 is used to install the drive assembly 3. The drive assembly 3 can pass through the first mounting hole 115 and be driven to connect with the impeller 12. By setting the noise reduction holes 116, the gas can be transmitted to the sound absorption assembly 4 through the noise reduction holes 116, thereby achieving noise reduction treatment of the gas inside the volute 11.

[0062] Specifically, the diameter of the silencing hole 116 is limited according to the specific dimensions of the volute 11.

[0063] In some possible embodiments, the axis of the impeller 12 is coaxial with the axis of the first mounting hole 115. By matching the axis of the impeller 12 with the axis of the first mounting hole 115, the diameter of the first mounting hole 115 can be avoided from being too large, thereby ensuring the overall strength of the volute 11 and improving its service life.

[0064] In this embodiment, the shape of the volute 11 is not limited, as long as it meets the functions of air intake, air exhaust and installation.

[0065] Preferably, the two end faces of the volute 11 have the same shape, and the width direction of the volute 11 is along the path from the air inlet end face to the mounting end face or from the mounting end face to the air inlet end face. The mounting end face and the air inlet end face are connected by a side wall to form the volute 11, and the side wall of the volute 11 is an arc-shaped surface.

[0066] Preferably, the volute 11 has a shape similar to the number "6".

[0067] In another aspect, the present invention also protects a dual-suction range hood, including a drive assembly 3, a first fume diversion device 1 as described above, and a second fume diversion device 1 as described above; the first fume diversion device 1 and the second fume diversion device 1 are symmetrically arranged, and the mounting end faces of the first fume diversion device 1 and the second fume diversion device 1 abut against each other; the drive assembly 3 has a first drive end 31 and a second drive end 32, the first drive end 31 is drivenly connected to the impeller 12 of the first fume diversion device 1, and the second drive end 32 is drivenly connected to the impeller 12 of the second fume diversion device 1.

[0068] It should be noted that: the existing setup has two sets of fume diversion devices 1 driven by the same drive component 3, and the air inlets of the two sets of fume diversion devices 1 are arranged opposite each other. Since the gas enters its respective impeller 12 from two opposite directions and then exits, there is an airflow component in the area where the drive component 3 is located that flows toward the other impeller 12. The two opposite airflow components will collide in the area where the drive component 3 is located, which will cause a turbulent zone in the area and increase the noise.

[0069] In this embodiment, the impeller 12 of the first fume diversion device 1 and the impeller 12 of the second fume diversion device 1 are coaxially arranged.

[0070] Preferably, the drive assembly 3 is a motor with a bidirectional shaft design.

[0071] In this embodiment, by symmetrically arranging two sets of independent air intake and exhaust fume diversion devices 1, the turbulence zone formed by the opposing airflow generated by the two sets of fume diversion devices 1 can be reduced, allowing the gas to be discharged smoothly and reducing the noise of the dual-suction range hood. At the same time, the flow obstruction groove 112 is provided on the mounting end face of the volute 11, which can ensure that the amount of gas entering through the air intake is greatly reduced, thereby reducing the amount of gas returning to the impeller, thus improving the internal flow field under high resistance conditions, improving the performance of the impeller 12, achieving the function of noise reduction, and bringing a comfortable kitchen environment to the user.

[0072] Furthermore, in this embodiment, a set of mounting end faces and another set of mounting end faces are sequentially arranged between the impellers 12 of the two sets of fume diversion devices 1, so that some of the gas inside the volute 11 can flow out directly from their respective air outlets 111, avoiding collisions between the gas flowing out of the two sets of fume diversion devices 1 and the generation of turbulent flow zones; a silencer hole 116 is provided on the two sets of mounting end faces, and a sound-absorbing component 5 is provided between the two sets of mounting end faces, so that the gas facing the adjacent fume diversion device 1 is subjected to noise reduction treatment by the sound-absorbing component 5 after passing through the silencer hole 116, so that the gas is discharged smoothly, thereby reducing the noise of the dual-suction range hood.

[0073] In some possible embodiments, an air outlet assembly 2 is also included, which includes an air outlet hood 21, a flow guide assembly 22, and a connector 23. The air outlet hood 21 is connected to the air outlet 111 of the first fume diversion device 1 and the air outlet 111 of the second fume diversion device 1 via the connector 23. The flow guide assembly 22 is disposed inside the air outlet hood 21 and is used to divide the air outlet hood 21 into a first air outlet area and a second air outlet area. The first air outlet area is connected to the air outlet 111 of the first fume diversion device 1, and the second air outlet area... The exhaust hood 21 is connected to the air outlet 111 of the second fume diversion device 1. By setting an exhaust hood 21 and dividing the exhaust hood 21 into a first exhaust area and a second exhaust area by the flow guiding component 22, the gas flowing out of the first fume diversion device 1 flows to the first exhaust area and the gas flowing out of the second fume diversion device 1 flows to the second exhaust area. This can prevent the gas flowing out of the first fume diversion device 1 from colliding with the gas flowing out of the second fume diversion device 1 in the exhaust hood 21 and generating a turbulent area, thereby avoiding noise generation.

[0074] Specifically, the air outlet hood 21 includes an air inlet opening and an air outlet opening arranged opposite to each other. The air inlet opening is connected to two sets of volutes 11. The cross-sectional area of ​​the air outlet hood 21 gradually decreases from the air inlet opening to the air outlet opening.

[0075] Specifically, the air inlet opening is square, and the air outlet opening is circular.

[0076] In some possible embodiments, the flow guiding component 22 includes a first guide slope 221 and a second guide slope 222. The first end of the first guide slope 221 is connected to the air outlet 111 of the first fume diversion device 1, and the first end of the second guide slope 222 is connected to the air outlet 111 of the second fume diversion device 1. The second ends of the first guide slope 221 and the second guide slope 222 gradually approach each other in a direction away from the air outlet 111 until they are connected. By setting the first guide slope 221 and the second guide slope 222, the air outlets of the fume diversion devices 1 on both sides can flow more closely to the streamline, so that the airflow on both sides can be smoothly merged and discharged, reducing the fluid loss caused by mixing at the outlet and improving the air outlet efficiency.

[0077] In some other possible embodiments, the flow guiding assembly 22 includes a first flow guiding plate and a second flow guiding plate. The side of the first flow guiding plate away from the second flow guiding plate is a first guide arc surface 221, and the side of the second flow guiding plate away from the first flow guiding plate is a second guide arc surface 222. The first end of the first flow guiding plate is connected to the air outlet 111 of the first fume diversion device 1, the first end of the second flow guiding plate is connected to the air outlet 111 of the second fume diversion device 1, and the second end of the first flow guiding plate is connected to the second end of the second flow guiding plate. The first flow guiding plate and the second flow guiding plate form a "V" shaped structure.

[0078] In some possible embodiments, a sound-absorbing component 4 is also included, which includes a first sound-absorbing element 41 and a second sound-absorbing element 42. A first fume diversion device 1 and a second fume diversion device 1 are symmetrically arranged on both sides of the sound-absorbing component 4. Along the radial direction of the flow-blocking groove 112, a first mounting groove 113, a flow-blocking groove 112, and a second mounting groove 114 are sequentially arranged on the mounting end face. After the first fume diversion device 1 and the second fume diversion device 1 are connected, the two sets of first mounting grooves 113 interlock to form a first accommodating space, and the two sets of second mounting grooves 114 interlock to form a second accommodating space. The first sound-absorbing element 41 is disposed in the first accommodating space, and the second sound-absorbing element 42 is disposed in the second accommodating space. By setting the first sound-absorbing element 41 and the second sound-absorbing element 42 in the first mounting groove 113 and the second mounting groove 114 respectively, sound absorption treatment can be performed on the first fume diversion device 1 and the second fume diversion device 1 on both sides to reduce noise.

[0079] Furthermore, in this embodiment, by symmetrically arranging two sets of independent air intake and exhaust fume diversion devices 1, the turbulence zone formed by the opposing airflows generated by the two sets of fume diversion devices 1 can be reduced, allowing the gas to be discharged smoothly and reducing the noise of the dual-suction range hood. Simultaneously, a flow-blocking groove 112 is provided on the mounting end face of the volute 11, which ensures a significant reduction in the amount of gas entering through the air intake, thereby reducing the amount of gas returning to the impeller, thus improving the internal flow field under high-resistance conditions and further achieving noise reduction. Moreover, by providing an exhaust hood 21 with a first exhaust area and a second exhaust area, it can... This design allows the gas flowing out of the first fume diversion device 1 to flow to the first air outlet area, and the gas flowing out of the second fume diversion device 1 to flow to the second air outlet area. This avoids collisions between the gas flowing out of the first fume diversion device 1 and the gas flowing out of the second fume diversion device 1 within the air outlet hood 21, thus preventing the formation of turbulent flow zones and further reducing noise. At the same time, the first guide slope 221 and the second guide slope 222 enable the air outlets of the fume diversion devices 1 on both sides to flow more closely to the streamline, allowing the airflow on both sides to merge smoothly before being discharged, reducing fluid loss caused by mixing at the outlet and improving air outlet efficiency.

[0080] Specifically, the first sound-absorbing element 41 and the second sound-absorbing element 42 are both annular structures that match their respective accommodating spaces.

[0081] In this embodiment, the materials of the first sound-absorbing component 41 and the second sound-absorbing component 42 are both sound-absorbing materials.

[0082] Preferably, the first sound-absorbing element 41 and the second sound-absorbing element 42 are sound-absorbing cotton.

[0083] Specifically, after the first fume diversion device 1 and the second fume diversion device 1 are connected to each other, the bottom of the flow-blocking groove 112 of the first fume diversion device 1 is in contact with the bottom of the flow-blocking groove 112 of the second fume diversion device 1.

[0084] Specifically, both the first and second accommodating spaces are annular structures, and along the radial direction of the mounting end face, the first accommodating space, the flow-blocking groove 112, and the second accommodating space are arranged sequentially.

[0085] Furthermore, the first mounting hole 115 is provided on the first mounting groove 113.

[0086] Example 1

[0087] See appendix Figure 1-6This embodiment provides an oil fume diversion device, including: a volute 11 having an air outlet 111, an air inlet end face, and an installation end face, the air inlet end face and the installation end face being arranged opposite each other and forming an inner cavity of the volute, and at least one flow-blocking groove 112 being provided on the installation end face; the air outlet 111 being located on the side wall of the volute 11; an impeller 12 having its axis arranged along the direction from the air inlet end face to the installation end face; the impeller 12 being disposed in the inner cavity of the volute, with a portion of the impeller 12 covering the flow-blocking groove 112, and an air inlet being provided between the impeller 12 and the flow-blocking groove 112; in the operating state of the impeller 12, gas is sequentially diverted from the impeller 12 to the air inlet and the flow-blocking groove 112 and then flows back to the impeller 12, and flows out of the inner cavity of the volute through the air outlet 111.

[0088] Preferably, the volute 11 has a shape similar to the number "6", and an air inlet is provided on the air inlet end face, through which gas flows into the inner cavity of the volute.

[0089] In this embodiment, a first mounting hole 115 and several noise reduction holes 116 are provided on the mounting end face. The first mounting hole 115 is used to install the drive assembly 3. The drive assembly 3 can pass through the first mounting hole 115 and be driven to connect with the impeller 12.

[0090] Specifically, the diameter of the silencing hole 116 is limited according to the specific dimensions of the volute 11.

[0091] In this embodiment, the axis of the impeller 12 is coaxial with the axis of the first mounting hole 115.

[0092] In this embodiment, the flow obstruction groove 112 is an annular groove.

[0093] Specifically, the bottom of the flow obstruction groove 112 is provided with a second mounting hole 117, and the volute 11 is detachably connected to the adjacent volute 11 through the second mounting hole 117.

[0094] Preferably, the flow-blocking groove 112 is provided with four second mounting holes 117 at intervals.

[0095] Specifically, the connection area between the outer diameter of the flow obstruction groove 112 and the mounting end face of the volute 11 adopts a variable curvature arc design, with the curvature gradually increasing towards the annular wall of the volute 11, which can reduce the resistance of the air outlet at the bottom of the impeller 12.

[0096] In this embodiment, the air inlet and the flow-blocking groove 112 can be defined as a reverse flow channel. Gas from the high-pressure area can enter the air inlet of the impeller 12 through the reverse flow channel, forming a reverse flow. When the impeller 12 is running, the flow-blocking groove 112 can obstruct the reverse flow, blocking most of it and reducing its size. Furthermore, due to the design of the flow-blocking groove 112—specifically, the limitations on its structure and dimensions—even if some reverse flow remains, its path is more tortuous when it enters the groove, resulting in greater losses. Additionally, the vertical design of the inner diameter of the flow-blocking groove 112 guides a smaller amount of secondary flow, allowing it to enter the impeller 12 air inlet in a specific direction within a smaller area, reducing the turbulence range affected by the reverse flow. The combination of these three factors allows for effective control of the reverse flow in the gap between the impeller 12 and the bottom of the volute 11.

[0097] Specifically, the inner diameter of the flow obstruction groove 112 is smaller than the outer diameter of the impeller 12, while the outer diameter of the flow obstruction groove 112 is larger than the outer diameter of the impeller 12.

[0098] In this embodiment, the fume diversion device 1 satisfies at least one of the following features: there is a gap between the end face of the impeller 12 and the mounting end face, and the length of the gap is 0-3mm; the minimum distance between the end face of the impeller 12 and the bottom of the flow obstruction groove 112 is 8-12mm.

[0099] Specifically, the impeller 12 rotates relative to the volute 11, so there must be a gap between them. The length of the gap can be 0-1mm, 0-2mm, 0-3mm, 1-2mm, 1-3mm or 2-3mm, etc.

[0100] Specifically, the minimum distance between the end face of the impeller 12 and the bottom of the flow obstruction groove 112 is 8-9mm, 8-10mm, 8-11mm, 8-12mm, 9-10mm, 9-12mm, 9-12mm, 10-11mm, 10-12mm or 11-12mm, etc.

[0101] Furthermore, the end face of the impeller 12 refers to the face perpendicular to the axial direction of the impeller 12. Both the mounting end face and the air inlet end face are faces perpendicular to the axial direction of the impeller 12. The end face of the impeller 12 is set parallel to the mounting end face.

[0102] In this embodiment, the minimum distance between the outer diameter of the impeller 12 and the outer side of the flow obstruction groove 112 is not less than 5 mm.

[0103] Preferably, the minimum distance between the outer diameter of the impeller 12 and the outer side of the flow obstruction groove 112 is 5 mm.

[0104] In this embodiment, the gap between the end face of the impeller 12 and the mounting end face is defined as a, the minimum distance between the outer diameter of the impeller 12 and the outer side of the flow obstruction groove 112 is defined as b, the distance between the inner diameter of the impeller 12 and the inner diameter of the flow obstruction groove 112 is defined as c, and the distance between the end face of the impeller 12 and the bottom of the flow obstruction groove 112 is defined as d.

[0105] In this embodiment, when the impeller 12 is in operation, a low-pressure area is formed in the area where the impeller 12 is located, and a high-pressure area is formed between the impeller 1 and the side wall of the volute 11. The gas entering from the air inlet on the air inlet end face flows to the high-pressure area after passing through the low-pressure area, and flows out of the inner cavity of the volute through the air outlet 111 which is connected to the high-pressure area.

[0106] Furthermore, some gas flows sequentially from the low-pressure region of the impeller 12 to the high-pressure region, the air inlet, and the flow-blocking groove 112, then flows back to the low-pressure region where the impeller 12 is located, and flows back to the high-pressure region, and then flows out of the volute cavity through the air outlet 111; another part of the gas flows from the low-pressure region of the impeller 12 to the high-pressure region, and flows out of the volute cavity through the air outlet 111. By setting the flow-blocking groove 112, the amount of gas flowing back to the impeller can be reduced, the performance of the impeller 12 can be improved, and the noise reduction function can be achieved.

[0107] In another aspect, the present invention also protects a dual-suction range hood, including a drive assembly 3, a first fume diversion device 1 as described above, and a second fume diversion device 1 as described above; the first fume diversion device 1 and the second fume diversion device 1 are symmetrically arranged, and the mounting end faces of the first fume diversion device 1 and the second fume diversion device 1 abut against each other; the drive assembly 3 has a first drive end 31 and a second drive end 32, the first drive end 31 is drivenly connected to the impeller 12 of the first fume diversion device 1, and the second drive end 32 is drivenly connected to the impeller 12 of the second fume diversion device 1.

[0108] Preferably, the drive assembly 3 is a motor with a bidirectional shaft design.

[0109] In this embodiment, a set of mounting end faces and another set of mounting end faces are arranged sequentially between the impellers 12 of the two sets of fume diversion devices 1, so that some of the gas inside the volute 11 can flow out directly from their respective air outlets 111, avoiding collisions between the gas flowing out of the two sets of fume diversion devices 1 and the generation of turbulent flow zones; a silencer hole 116 is provided on the two sets of mounting end faces, and a sound-absorbing component 5 is provided between the two sets of mounting end faces, so that the gas facing the adjacent fume diversion device 1 is subjected to noise reduction treatment by the sound-absorbing component 5 after passing through the silencer hole 116, so that the gas is discharged smoothly, thereby reducing the noise of the dual-suction range hood.

[0110] In this embodiment, the impeller 12 of the first fume diversion device 1 and the impeller 12 of the second fume diversion device 1 are coaxially arranged.

[0111] In this embodiment, the dual-suction range hood further includes an air outlet assembly 2, which includes an air outlet hood 21, a flow guide assembly 22, and a connector 23. The air outlet hood 21 is connected to the air outlet 111 of the first fume diversion device 1 and the air outlet 111 of the second fume diversion device 1 via the connector 23. The flow guide assembly 22 is disposed inside the air outlet hood 21 and is used to divide the air outlet hood 21 into a first air outlet area and a second air outlet area. The first air outlet area is connected to the air outlet 111 of the first fume diversion device 1, and the second air outlet area is connected to the air outlet 111 of the second fume diversion device 1.

[0112] Specifically, the air outlet hood 21 includes an air inlet opening and an air outlet opening arranged opposite to each other. The air inlet opening is connected to two sets of volutes 11. The cross-sectional area of ​​the air outlet hood 21 gradually decreases from the air inlet opening to the air outlet opening.

[0113] Specifically, the air inlet opening is square, and the air outlet opening is circular.

[0114] In this embodiment, the flow guiding component 22 includes a first guide slope 221 and a second guide slope 222. The first end of the first guide slope 221 is connected to the air outlet 111 of the first fume diversion device 1, and the first end of the second guide slope 222 is connected to the air outlet 111 of the second fume diversion device 1. The second ends of the first guide slope 221 and the second guide slope 222 gradually approach each other in a direction away from the air outlet 111 until they connect. By setting the first guide slope 221 and the second guide slope 222, the air outlets of the fume diversion devices 1 on both sides can flow more closely to the streamline, so that the airflow on both sides can be smoothly merged and discharged, reducing the fluid loss caused by the mixing at the outlet and improving the air outlet efficiency.

[0115] In this embodiment, the dual-suction range hood also includes a sound-absorbing component 4, which includes a first sound-absorbing element 41 and a second sound-absorbing element 42. A first oil fume diversion device 1 and a second oil fume diversion device 1 are symmetrically arranged on both sides of the sound-absorbing component 4. Along the radial direction of the flow-blocking groove 112, a first mounting groove 113, a flow-blocking groove 112, and a second mounting groove 114 are sequentially arranged on the mounting end face. After the first oil fume diversion device 1 and the second oil fume diversion device 1 are connected, the two sets of first mounting grooves 113 interlock to form a first accommodating space, and the two sets of second mounting grooves 114 interlock to form a second accommodating space. The first sound-absorbing element 41 is disposed in the first accommodating space, and the second sound-absorbing element 42 is disposed in the second accommodating space.

[0116] Furthermore, the first mounting hole 115 is provided on the first mounting groove 113.

[0117] Specifically, the first sound-absorbing element 41 and the second sound-absorbing element 42 are both annular structures that match their respective accommodating spaces.

[0118] Preferably, the first sound-absorbing element 41 and the second sound-absorbing element 42 are sound-absorbing cotton.

[0119] Specifically, after the first fume diversion device 1 and the second fume diversion device 1 are connected to each other, the bottom of the flow-blocking groove 112 of the first fume diversion device 1 is in contact with the bottom of the flow-blocking groove 112 of the second fume diversion device 1.

[0120] Specifically, both the first and second accommodating spaces are annular structures, and along the radial direction of the mounting end face, the first accommodating space, the flow-blocking groove 112, and the second accommodating space are arranged sequentially.

[0121] While the present invention has been described through preferred embodiments, it is not limited to the embodiments described herein, and various changes and modifications are made without departing from the scope of the invention.

[0122] In this document, the directional terms such as front, back, top, and bottom are defined according to the positions of the components in the accompanying drawings and the positions between the components, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed by this invention.

[0123] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0124] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An oil fume drainage device, characterized by, include: The volute (11) has an air outlet (111), an air inlet end face, and a mounting end face. The air inlet end face and the mounting end face are arranged opposite to each other and form an inner cavity of the volute. At least one flow-blocking groove (112) is provided on the mounting end face. The air outlet (111) is located on the side wall of the volute (11). Impeller (12), the axis of which is arranged along the direction from the air inlet end face to the mounting end face; The impeller (12) is disposed in the inner cavity of the volute, and part of the impeller (12) covers the flow obstruction groove (112). There is an air inlet between the impeller (12) and the flow obstruction groove (112). The inner diameter of the flow-blocking groove (112) is smaller than the outer diameter of the impeller (12), and the outer diameter of the flow-blocking groove (112) is larger than the outer diameter of the impeller (12); The impeller (12) forms a low-pressure area, and the impeller (12) and the sidewall of the volute (11) form a high-pressure area; the air inlet and the flow-blocking groove (112) are reverse flow channels, and the gas in the high-pressure area enters the air inlet of the impeller (12) through the reverse flow channel to form a reverse flow; When the impeller (12) is in operation, the flow obstruction groove (112) is used to obstruct the reverse flow when the impeller (12) is running out of air; the gas flows from the impeller (12) to the air inlet and the flow obstruction groove (112) in sequence and then flows back to the impeller (12) and flows out of the inner cavity of the volute through the air outlet (111).

2. The oil fume drainage device according to claim 1, characterized in that, The flow-blocking groove (112) is an annular groove.

3. The oil fume drainage device according to claim 1, characterized in that, The fume diversion device satisfies at least one of the following characteristics: There is a gap between the end face of the impeller (12) and the mounting end face, and the length of the gap is 0-3mm; The minimum distance between the end face of the impeller (12) and the bottom of the flow-blocking groove (112) is 8-12 mm.

4. The oil smoke extraction device of claim 1, wherein, The minimum distance between the outer diameter of the impeller (12) and the outer side of the flow obstruction groove (112) is not less than 5 mm.

5. The oil fume drainage device according to any one of claims 1-4, characterized in that, The mounting end face is provided with a first mounting hole (115) and a plurality of noise reduction holes (116). The first mounting hole (115) is used to mount the drive assembly (3). The drive assembly (3) can pass through the first mounting hole (115) and be driven to connect with the impeller (12).

6. The oil flume of claim 5, wherein, The axis of the impeller (12) is coaxial with the axis of the first mounting hole (115).

7. A dual suction range hood characterized in that, It includes a drive assembly (3), a first fume diversion device, and a second fume diversion device; the first fume diversion device and the second fume diversion device are the fume diversion devices according to any one of claims 1-6; The first fume diversion device and the second fume diversion device are symmetrically arranged, and the mounting end face of the first fume diversion device and the mounting end face of the second fume diversion device abut against each other; The drive assembly (3) has a first drive end (31) and a second drive end (32). The first drive end (31) is driven to the impeller (12) of the first fume diversion device, and the second drive end (32) is driven to the impeller (12) of the second fume diversion device.

8. The dual-suction range hood according to claim 7, characterized in that, It also includes an air outlet assembly (2), which includes an air outlet cover (21), a flow guide assembly (22), and a connector (23); The exhaust hood (21) is connected to the exhaust port (111) of the first fume diversion device and the exhaust port (111) of the second fume diversion device through the connector (23); The air guide component (22) is disposed inside the air outlet hood (21). The air guide component (22) is used to divide the air outlet hood (21) into a first air outlet area and a second air outlet area. The first air outlet area is connected to the air outlet (111) of the first fume diversion device, and the second air outlet area is connected to the air outlet (111) of the second fume diversion device.

9. The dual-suction range hood according to claim 8, characterized in that, The flow guiding component (22) includes a first guide slope (221) and a second guide slope (222). The first end of the first guide slope (221) is connected to the air outlet (111) of the first fume diversion device, and the first end of the second guide slope (222) is connected to the air outlet (111) of the second fume diversion device. The second ends of the first guide slope (221) and the second ends of the second guide slope (222) gradually approach each other in a direction away from the air outlet (111) until they are connected.

10. The dual-suction range hood according to claim 8, characterized in that, It also includes a sound-absorbing component (4), which includes a first sound-absorbing element (41) and a second sound-absorbing element (42); The first fume diversion device and the second fume diversion device are symmetrically arranged on both sides of the sound absorption component (4); Along the radial direction of the flow-blocking groove (112), a first mounting groove (113), the flow-blocking groove (112), and a second mounting groove (114) are sequentially provided on the mounting end face; After the first fume diversion device and the second fume diversion device are connected, the two sets of first mounting slots (113) interlock to form a first accommodating space, and the two sets of second mounting slots (114) interlock to form a second accommodating space. The first sound-absorbing component (41) is disposed in the first accommodating space, and the second sound-absorbing component (42) is disposed in the second accommodating space.

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