Top-side double-suction type range hood

Abstract

A top-side double-suction type range hood comprises an exhaust fume collecting hood and a draught fan box which are communicated through a through opening, the exhaust fume collecting hood comprises a side suction part and a top suction part, a draught fan assembly is arranged in the draught fan box and comprises a volute and an impeller located in the volute, and the side suction part and the top suction part are communicated through the through opening. An inner cavity of the side suction part and an inner cavity of the top suction part are both communicated with an inner cavity of the fan box through the through opening, the range hood further comprises a partition plate, and the partition plate longitudinally extends from the exhaust fume collecting hood, penetrates through the through opening and is connected with the rear portion of the volute; and the separation plate is used for separately guiding the oil fume from the side suction part and the oil fume from the top suction part to the impeller. Compared with the prior art, the technical scheme provided by the invention has the advantages that the mixed flow phenomenon is completely eradicated due to air duct isolation, the industrial pain point of'false suction at the top 'is strongly solved due to the smoking performance, the structure is stable and reliable, and the noise is low.

Description

Technical Field

[0001] This invention relates to the field of exhaust ducts for top-side dual-suction range hoods, and particularly to a top-side dual-suction range hood. Background Technology

[0002] Among various range hood products, the top-side dual-suction 7-shaped composite range hood has become the mainstream smoke extraction product in modern kitchens due to its dual structural advantages of top suction and side suction.

[0003] In existing technologies, such range hoods generally adopt a "dual smoke inlet" design with a top-mounted and side-mounted intake. The fan assembly integrates airflow through front and rear dual-sided intake. However, traditional fan housings lack effective flow diversion structures, causing the air intake from the top and side intakes to mix before entering the impeller, resulting in significant airflow turbulence and vortex phenomena. More importantly, to suppress the reduction in smoke extraction performance caused by this mixing phenomenon, most existing products have to artificially limit the amount of smoke from the top-mounted intake by tightening the top-mounted air duct or reducing the forward air pressure. This compromise design results in the actual airflow from the top-mounted intake accounting for less than 15% of the total airflow, creating a technical defect of "appearing to be dual-suction but effectively single-suction," failing to truly achieve immediate capture of smoke from the top.

[0004] Although existing technologies have attempted to isolate the flow through local baffles or guide vanes, the isolation efficiency is generally still below 65% because a fully sealed structure is not formed, and secondary eddies are easily generated at the edge of the baffle. For example, Chinese utility model patent CN222992984U, entitled "Top-Side Dual-Suction Range Hood," discloses: a fan box; a smoke collection chamber including a side cavity extending longitudinally from and communicating with the fan box and a top cavity extending laterally from and communicating with the side cavity, the front wall of the side cavity having a side-suction smoke inlet located below the top cavity, and the bottom wall of the top cavity having a top-suction smoke inlet; a smoke baffle plate, which is rotatably disposed outside the side cavity and located below the top cavity to selectively open or close the side-suction smoke inlet; and a diverter plate, which is rotatably disposed inside the side cavity and arranged adjacent to the top cavity to selectively open or close the communication port between the top cavity and the side cavity. The technical solution described in this utility model allows the range hood to achieve only "single suction" when the diversion plate separately closes the top cavity or the side cavity; only when the diversion plate is flipped to allow both the top and side cavities to be open can the range hood truly achieve "dual suction". However, this technical solution still cannot solve the problem of mixing between the top and side air intakes before they enter the impeller, resulting in severe airflow turbulence and vortex phenomena, and generating secondary vortices at the diversion plate, leading to decreased smoke extraction performance and increased noise. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a top-side dual-suction range hood that features air duct isolation to prevent crossflow, powerful smoke extraction performance that solves the industry pain point of "top-mounted weak suction," and a stable, reliable structure with low noise.

[0006] The present invention mainly adopts the following technical solution: A top-and-side dual-suction range hood includes a smoke collection hood and a fan box connected by a through-hole. The smoke collection hood includes a side suction section and a top suction section. The fan box contains a fan assembly, which includes a volute and an impeller located within the volute. The inner cavities of the side suction section and the top suction section are both connected to the inner cavity of the fan box through the through-hole. The range hood also includes a partition plate that extends longitudinally from the smoke collection hood, passes through the through-hole, and connects to the rear of the volute. The partition plate guides the fumes from the side suction section and the fumes from the top suction section to the impeller in a mutually isolated manner.

[0007] The longitudinal section of the smoke collection hood is shaped like the number 7. The side suction part includes a front side plate, the top suction part includes a bottom plate, and the bottom end of the partition plate is located at the junction of the front side plate and the bottom plate.

[0008] The front side plate has its top edge bent forward to form a folded edge, and the front side plate is bent backward at an obtuse angle near the folded edge to form a supporting edge. The bottom plate gradually slopes downward from front to back, and a positioning edge is formed on the rear edge of the bottom plate. The positioning edge is placed on the supporting edge and abuts against the folded edge so that the positioning edge and the supporting edge are in contact.

[0009] The rear edge of the base plate is bent upward to form a gusseted edge, which abuts against and fits against the folded edge.

[0010] The bottom plate has a concave center to form a smoke-collecting top cover, and the side wall of the smoke-collecting top cover is provided with a flow-suppressing grid. The edge of the flow-suppressing grid extends inward to form a flow-guiding lip.

[0011] The smoke-collecting top cover has a frustum-shaped structure.

[0012] It also includes a fork-shaped support member, one end of which is connected to the side wall of the volute, and the other end of which is connected to the fan box.

[0013] The top of the partition plate has an arc-shaped clearance notch, and the edge of the arc-shaped clearance notch is connected to the side wall of the volute.

[0014] The edge of the arc-shaped clearance notch is formed with a dovetail-shaped groove on at least one side.

[0015] The impeller is provided with a baffle near its cross-section, which divides the impeller into a front part and a rear part. The volute has a front air inlet and a rear air inlet. The fumes from the side suction part enter the rear part through the rear air inlet, and the fumes from the top suction part enter the front part through the front air inlet.

[0016] The baffle is connected to the impeller hub via a sealing boss.

[0017] The size of the through-hole is not greater than the cross-sectional size of the fan box, and the partition plate controls the ratio of the flow volume of oil fumes from the side suction part and the oil fumes from the top suction part at the through-hole to be between 5:1 and 8:1.

[0018] According to the technical solution described in this invention, the following beneficial effects are achieved: the partition plate isolates the fumes from the side suction section and the top suction section, guiding them separately to the impeller, thereby achieving airtight isolation of the duct, completely eliminating the mixing phenomenon, solving the industry pain point of "top suction," and also eliminating eddy current interference and reducing operating noise; the bottom end of the partition plate is located at the junction of the front side plate and the bottom plate, and the front side plate and the bottom plate are connected by the abutment and positioning edge, providing stable support for the bottom end of the partition plate; moreover, the bottom end of the partition plate is located at the junction of the front side plate and the bottom plate. At the junction of the base plates, physical isolation is achieved from the root of the air duct, which plays a good role in improving smoke extraction performance. The folded edge setting acts as a limit for the positioning edge, and together with the friction between the folded edge and the edge, it can better limit the position and prevent slippage between the two. The flow-suppressing grille of the smoke collection hood further guides the flow of oil fumes through the guide lip, which can further eliminate turbulence and vortex phenomena, providing favorable conditions for improving smoke extraction performance. The fork-shaped support is conducive to further fixing the fan assembly, improving the stability of the fan assembly, and preventing vibration from causing greater noise. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a top-side dual-suction range hood.

[0020] Figure 2 for Figure 1 A schematic diagram of the structure after opening the side panel of the fan box.

[0021] Figure 3 for Figure 2 Schematic diagram of the middle section.

[0022] Figure 4 for Figure 3 Schematic diagram of the middle section.

[0023] Figure 5 for Figure 4 A schematic diagram of the decomposition of the middle part of the structure.

[0024] Figure 6 for Figure 5 Enlarged view of section A.

[0025] Figure 7 This is a schematic diagram of the partition structure.

[0026] Figure 8 This is a schematic diagram of the wind turbine assembly structure.

[0027] 10 Through-hole, 2 Smoke hood, 21 Side suction unit, 211 Front side plate, 22 Top suction unit, 221 Bottom plate, 2210 Smoke collection top cover, 3 Fan box, 4 Fan assembly, 41 Volute, 42 Impeller, 5 Divider plate, 50 Arc-shaped clearance notch, z Folded edge, t Supporting edge, d Positioning edge, m Edge, k Flow suppression grid, s Guide lip, 6 Support piece, v Slot, 8 Baffle. Detailed Implementation

[0028] The technical solution of the present invention will be further described below with reference to the accompanying drawings: See Figure 2-5As shown, a top-and-side dual-suction range hood includes a smoke collection hood 2 and a fan box 3 connected by a through-hole 10. The smoke collection hood 2 includes a side suction section 21 and a top suction section 22. The fan box 3 houses a fan assembly 4, which includes a volute 41 and an impeller 42 located within the volute 41. The inner cavities of the side suction section 21 and the top suction section 22 are both connected to the inner cavity of the fan box 3 through the through-hole 10. The hood also includes a partition plate 5, which extends longitudinally from the smoke collection hood 2, passes through the through-hole 10, and connects to the rear of the volute 41. The partition plate 5 guides the fumes from the side suction section 21 and the top suction section 22 separately to the impeller 42. Preferably, the partition plate 5 is made of metal or composite material; more preferably, the partition plate 5 is stamped from a 0.6mm thick steel plate. In this application, "longitudinal extension" includes, but is not limited to, extending vertically or extending obliquely longitudinally. In this application, connecting the partition plate to the volute casing ensures higher stability during installation. The connection also strengthens the structure of corresponding components within the range hood's interior, improving vibration resistance and effectively reducing vibration-induced noise. Furthermore, the connection between the partition plate and the rear of the volute casing provides more space for the top-suction section's fume duct, facilitating the rapid exhaust of collected fumes. In this application, the partition plate isolates the fumes from the side-suction and top-suction sections, guiding them separately to the impeller. This achieves complete airtight isolation of the ductwork, physically dividing the air intake channels of the side and top-suction sections into two independent flow channels. This completely eliminates cross-flow and solves the industry pain point of "top-mounted ineffective suction." It also eliminates eddy current interference at the partition plate in existing technologies, further reducing operating noise. Experimental data shows that this structural design can increase the total pressure efficiency of the fan assembly by 2.1%-2.8%, while reducing operating noise by 1.5-2.3 dB(A) by eliminating eddy current interference. The technical solution described in this application not only maintains the structural advantages of "dual smoke inlets" but also optimizes and achieves a synergistic improvement in efficiency and quietness by utilizing fluid dynamics principles, providing a brand-new solution for the development of exhaust duct technology for top-side dual-suction composite range hoods.

[0029] See Figure 1-5 As shown, the longitudinal section of the smoke hood 2 is generally shaped like the number 7. The side suction part 21 includes a front side plate 211, and the top suction part 22 includes a bottom plate 221. The bottom end of the partition plate 5 is located at the junction of the front side plate 211 and the bottom plate 221. In this application, the bottom end of the partition plate is located at the junction of the front side plate and the bottom plate, that is, physical isolation can be achieved from the root of the air duct, resulting in a more thorough and significant isolation effect, which plays a good role in improving the smoke extraction performance.

[0030] See Figure 3-5As shown, the top edge of the front panel 211 is bent forward to form a folded edge z, and the front panel 211 is bent backward at an obtuse angle near the folded edge z to form a supporting edge t. The bottom panel 221 gradually slopes downward from front to back, and a positioning edge d is formed on the rear edge of the bottom panel 221. The positioning edge d is placed on the supporting edge t and abuts against the folded edge z so that the positioning edge d and the supporting edge t are in contact. In this application, the bottom end of the partition plate is located at the point where the positioning edge and the supporting edge are in contact, thereby providing support for the bottom end of the partition plate. Moreover, the folded edge can also limit the bottom end of the partition plate on one side to prevent the partition plate from shifting or slipping out. In this application, the bottom panel gradually slopes downward from front to back, which is also more conducive to collecting dripping oil and guiding the oil to be collected together.

[0031] See Figure 3-5 As shown, the rear edge of the base plate 221 is also bent upward to form a retaining edge m, which abuts against and fits against the folded edge z. In this application, the retaining edge makes it less likely for the positioning edge to slip off from the folded edge. By utilizing the friction between the folded edge and the retaining edge, the positioning edge can be better limited and the displacement and slippage between the positioning edge and the supporting edge can be prevented.

[0032] See Figure 3-6 As shown, the center of the base plate 221 is recessed to form a smoke-collecting top cover 2210. The sidewall of the smoke-collecting top cover 2210 is provided with a flow-suppressing grid k, and the edge of the flow-suppressing grid k extends inward to form a guide lip s. Preferably, the width of the smoke-collecting top cover 2210 is not less than 820 mm to cover the area of ​​the dual-pot stove. Preferably, the angle between the extending direction of the guide lip s and the center line of the flow-suppressing grid k is between 0° and 7°, more preferably between 3° and 5°. In this application, the flow-suppressing grid can stably divert and guide the oil fume airflow, preventing airflow turbulence. Furthermore, the guide lip further guides the oil fume flow, further eliminating turbulence and vortex phenomena, providing favorable conditions for improving smoke extraction performance.

[0033] See Figure 3-5 As shown, the smoke collection hood 2210 has a frustum-shaped structure. In this application, preferably, the flow suppression grid k is formed on the top and side surfaces of the frustum-shaped structure. In this application, the frustum-shaped structure formed by the smoke collection hood with its concave center on the bottom plate further limits the bottom end of the partition plate on the other side, ensuring that the partition plate does not shift or slip, thus enhancing stability.

[0034] See Figure 2 , 3As shown, it also includes a fork-shaped support member 6, one end of which is connected to the side wall of the volute 41, and the other end of which is connected to the fan housing 3. In this application, the fork-shaped support member fixes and supports the fan assembly, which can further avoid noise caused by vibration, and the physical usage of the fork-shaped support member is low, thus reducing the cost.

[0035] See Figure 2-5 As shown in Figure 7, an arc-shaped clearance notch 50 is formed at the top of the partition plate 5, and the edge of the arc-shaped clearance notch 50 is connected to the side wall of the volute 41. In this application, the arc-shaped clearance notch is used to make way for the front air inlet and / or rear air inlet of the volute mentioned below, thereby avoiding interference with the air intake of the front air inlet and / or rear air inlet.

[0036] See Figure 5 , 7 As shown, at least one side of the edge of the arc-shaped clearance notch 50 is also formed with a dovetail-shaped groove v. In this application, the dovetail-shaped groove can reduce material consumption and production costs on the one hand; on the other hand, it can make way for the fork-shaped support to prevent the connection between the edge of the arc-shaped clearance notch and the side wall of the volute from being non-airtight, thus eliminating airflow interference.

[0037] See Figure 8 As shown, the impeller 42 is further provided with a baffle 8 near its midsection, dividing the impeller 42 into a front and a rear section. The volute 41 has a front air inlet and a rear air inlet. Oil fumes from the side suction section 21 enter the rear section through the rear air inlet, and oil fumes from the top suction section 22 enter the front section through the front air inlet. In this application, the position of the baffle is offset from the midsection, providing structural conditions for the exhaust volume of different flow rates. In actual production, the impeller blades can be fixed to both sides of the baffle by laser welding. After dynamic balancing testing (allowable deviation ≤ 80 μm), the impeller is assembled to the motor shaft. The deviation of the rotation plane of the blades at the front and rear of the impeller needs to be controlled within 0.1 mm.

[0038] See Figure 8 As shown, the baffle 8 is connected to the hub of the impeller 42 via a sealing boss. Preferably, the thickness of the baffle 8 is between 0.8 and 1.5 mm, and the baffle extends radially outward to the root of the impeller blades. In this application, the connection between the baffle and the impeller hub via the sealing boss ensures zero airflow leakage when the impeller rotates.

[0039] See Figure 2As shown, the size of the through-hole 10 is no larger than the cross-sectional size of the fan box 3. The partition plate 5 controls the flow-volume ratio of the fumes from the side suction section 21 and the fumes from the top suction section 22 at the through-hole 10 to be between 5:1 and 8:1. In this application, the air duct corresponding to the side suction section can be used as the main air duct (flow-volume ratio of approximately 83%); the air duct corresponding to the top suction section can be used as the auxiliary air duct (flow-volume ratio of approximately 17%), and the flow-volume ratio of the two is strictly controlled between 5:1 and 8:1. More preferably, the flow-volume ratio of the two is 5:1.

[0040] In this application, the fumes entering from the side-suction inlet and the top-suction inlet are physically isolated by the partition plate that passes through the longitudinal through-hole and reach the impeller respectively. They are then further isolated by the baffle near the middle section of the impeller and discharged through the "multi-stage" physically isolated air duct. This completely eliminates the phenomenon of fumes from different inlets mixing, resulting in an effective wind speed of more than 5m / s at the top-suction inlet, an increase in the total pressure efficiency of the fan by 2.1%-2.8%, and a reduction in operating noise of more than 1.5dB(A) (completely different from the "top-suction" situation in the prior art).

[0041] Although specific embodiments of the present invention have been described above, those skilled in the art can make modifications to them without departing from the spirit and principles of the present invention. The scope of protection of the present invention is defined by its claims and their equivalents.

Claims

1. A top-and-side dual-suction range hood, comprising a smoke collection hood and a fan box connected by a through-hole, the smoke collection hood comprising a side suction part and a top suction part, the fan box housing a fan assembly, the fan assembly comprising a volute and an impeller located within the volute, characterized in that: The inner cavities of the side suction section and the top suction section are both connected to the inner cavity of the fan box through the through-hole. It also includes a partition plate, which extends longitudinally from the smoke collection hood, passes through the through-hole, and is connected to the rear of the volute. The partition plate guides the oil fumes from the side suction section and the oil fumes from the top suction section to the impeller in a separate manner.

2. The top-side dual-suction range hood according to claim 1, characterized in that: The longitudinal section of the smoke hood is generally shaped like the number 7. The side suction part includes a front side plate, the top suction part includes a bottom plate, and the bottom end of the partition plate is located at the junction of the front side plate and the bottom plate.

3. The top-side dual-suction range hood according to claim 2, characterized in that: The top edge of the front panel is bent forward to form a folded edge, and the front panel is bent backward at an obtuse angle near the folded edge to form a supporting edge. The bottom plate gradually slopes downward from front to back, and a positioning edge is formed on the rear edge of the bottom plate. The positioning edge is placed on the supporting edge and abuts against the folded edge so that the positioning edge and the supporting edge fit together.

4. The top-side dual-suction range hood according to claim 3, characterized in that: The rear edge of the base plate is also bent upward to form a gusseted edge, which abuts against and fits against the folded edge.

5. The top-side dual-suction range hood according to claim 2, characterized in that: The bottom plate has a recessed center to form a smoke-collecting top cover, and the side wall of the smoke-collecting top cover is provided with a flow-suppressing grid, the edge of the flow-suppressing grid extends inward to form a flow-guiding lip.

6. The top-side dual-suction range hood according to claim 5, characterized in that: The smoke collection hood has a frustum-shaped structure.

7. The top-side dual-suction range hood according to claim 1, characterized in that: It also includes a fork-shaped support member, one end of which is connected to the side wall of the volute, and the other end of which is connected to the fan box.

8. The top-side dual-suction range hood according to claim 1, characterized in that: The top of the partition plate has an arc-shaped clearance notch, and the edge of the arc-shaped clearance notch is connected to the side wall of the volute.

9. The top-side dual-suction range hood according to claim 8, characterized in that: The edge of the arc-shaped clearance notch also has a dovetail-shaped groove formed on at least one side.

10. The top-side dual-suction range hood according to claim 1, characterized in that: The impeller is also provided with a baffle near its cross-section, which divides the impeller into a front part and a rear part. The volute has a front air inlet and a rear air inlet. The fumes from the side suction part enter the rear part through the rear air inlet, and the fumes from the top suction part enter the front part through the front air inlet.

11. The top-side dual-suction range hood according to claim 10, characterized in that: The baffle is connected to the impeller hub via a sealing boss.

12. The top-side dual-suction range hood according to any one of claims 1 to 11, characterized in that: The size of the through-hole is not greater than the cross-sectional size of the fan box, and the partition plate controls the ratio of the flow volume of oil fumes from the side suction part and the oil fumes from the top suction part at the through-hole to be between 5:1 and 8:1.

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