Exhaust hood with internal circulation

Abstract

Extractor hood with internal circulation, comprising a housing (1), an air intake inlet (2), a fan (3), a cold compression chamber (4), an air guide outlet (5) and a cooling device (6), where the air intake inlet (2) is connected to the cold compression chamber (4) and the cold compression chamber (4) is connected to the air guide outlet (5); the fan (3) is arranged at the air intake inlet (2); the housing (1) is designed in the form of a hood and has a hollow extractor chamber (11) inside; the air intake inlet (2) is arranged on an upper side of the extractor chamber (11); the air guide outlet (5) is arranged on a lower edge of an inner wall of the extractor chamber (11), characterized in that an opening of the air guide outlet (5) faces obliquely or directly towards the air intake inlet (2).

Description

[0001] The present invention relates to an extractor hood and, in particular, to an indoor extractor hood with internal circulation according to the preamble of claim 1. STATE OF THE ART

[0002] Global greenhouse gas emissions have become a hot topic in society, and technological innovation toward the goals of "carbon peak" and "carbon neutrality" is an important task we face today. Cooking oil fumes are a major source of carbon emissions from livelihoods. Promoting the transformation of the kitchen appliance industry will not only contribute to reducing energy consumption in the industry but also to a low-carbon lifestyle for the general public. The low-carbon development of cooking oil fume purification equipment in the commercial kitchen industry and range hoods for home cooking has become increasingly urgent.

[0003] To solve the atmospheric pollution caused by cooking oil fumes, indoor circulation oil fume purification products have been introduced. However, they generally add multiple purification materials or weighing modules to the traditional range hood to absorb or filter the oil fumes generated during cooking, and then recirculate the absorbed or filtered gas back into the room. These technologies have the disadvantages that it is difficult to achieve a thorough one-time purification of oil fume gas with existing filter materials, and the purification effect decreases over time, leading to indoor pollution.

[0004] US 2021 / 0 396 394 A1 discloses that exemplary embodiments of the described technology provide a range hood for removing exhaust gases generated by cooking operations. The range hood may include an exhaust fan operable to create a negative pressure area beneath the range hood to draw air entraining the exhaust gases into the range hood. The range hood may also include one or more plenums in fluid communication with the exhaust fan. The range hood may also include one or more openings in fluid communication with the one or more plenums, the openings being arranged along a front edge of the range hood.The extractor hood may also include a filter for cleaning the air drawn into the extractor hood, so that the air drawn into the extractor hood by the exhaust fan is drawn through the filter to obtain purified air. The extractor hood may direct at least a portion of the purified air into one or more air chambers. The openings may be configured such that the portion of the purified air is expelled through one or more nozzles arranged to create an air curtain.

[0005] DE 10 2021 201 952 A1 relates to a household steam cooking appliance comprising a steam treatment chamber with a steam inlet and a vapor outlet, an evaporator with a water inlet and a steam outlet, which steam outlet is connected to the steam inlet of the steam treatment chamber, and a water tank with a water outlet, which water outlet is connected to the water inlet of the evaporator. The water tank has a gas outlet and a vapor inlet, which vapor inlet is connected to the vapor outlet of the steam treatment chamber. DE 805 869 B discloses an insulating layer on sheet metal extractor hoods for ovens to prevent the formation of condensation and dripping water. This insulating layer consists of an elastic, moisture-impermeable primer made of a mass that is sticky when fresh and a fiber material glued thereto.

[0006] Due to the disadvantages of the prior art, the technical object of the present invention is to provide a range hood with internal circulation that sucks the oil vapor gas generated by cooking into the range hood, while the expelled gas entrains the oil vapor gas generated by cooking to re-enter the same duct to circulate for re-cooling treatment.

[0007] To achieve this object according to the invention, the present disclosure provides a range hood with internal circulation, comprising a housing, an air intake inlet, a fan, a cold compression chamber, an air guide outlet, and a cooling device. The air intake inlet communicates with the cold compression chamber, and the cold compression chamber communicates with the air guide outlet. The fan is arranged at the air intake inlet. The housing is in the shape of a hood and has a hollow range chamber inside. The air intake inlet is arranged at an upper side of the range chamber. The air guide outlet is arranged at a lower edge of an inner wall of the range chamber, with an opening of the air guide outlet facing obliquely or directly toward the air intake inlet.

[0008] The extractor hood with internal circulation also includes a cleaning device. The cleaning device is located anywhere in the housing where the gas flows.

[0009] The cleaning device includes a mechanical grease separator. The mechanical grease separator is located at the air intake.

[0010] The cleaning device also includes one or any combination of an electrostatic oil vapor cleaner, a HEPA (high-efficiency particulate air) filter, an activated carbon filter material, a photocatalyst filter, and an ultraviolet lamp.

[0011] The air duct outlet has a plurality of holes arranged around the lower edge of the inner wall of the range hood, all of which are aligned in the same direction. Furthermore, the air duct outlet is arranged at an angle, and the direction of the gas exiting the air duct outlet coincides with the direction of rotation of the fan.

[0012] The cooling device comprises a water inlet valve, a condenser, a water tank and a water outlet valve, wherein the condenser is connected to the water tank, the water inlet valve is connected to the condenser or the water tank and the condenser is arranged within the cold compression chamber.

[0013] The extractor hood with internal circulation also includes a thermal insulation layer. The thermal insulation layer is arranged around the extractor chamber.

[0014] According to the internal circulation range hood provided by the present disclosure, the gas passes through the cold compression chamber under the suction and discharge action of the fan, allowing the cooled gas to be expelled through the air duct outlet. Then, the expelled cooled gas entrains the cooking oil vapor to enter the same duct for re-cooling, and so on. As a result, the cooking oil vapor is drawn into the internal circulation range hood without escaping into the interior, achieving zero emissions to the outside. At the same time, the impact of the high-temperature cooking oil vapor on the room is reduced, the load on the fan is reduced, and energy consumption is reduced.

[0015] The concept, specific structure and resulting technical effects of the present disclosure will be described in more detail below with reference to the accompanying figures in order to fully understand the purpose, features and effects of the present disclosure. BRIEF DESCRIPTION OF THE CHARACTERS Fig. 1 is a partial cross-sectional view of an internal circulation range hood according to the present disclosure. Fig. 2 is an enlarged view of position A in Fig. 1. Fig. 3 is a schematic diagram of an internal circulation range hood according to the present disclosure. Fig. Figure 4 is a partial sectional view of a lower section of an internal circulation range hood. Fig. 5 is a side sectional view of an internal circulation range hood according to the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The present disclosure will be described in more detail below with reference to the accompanying figures.

[0017] As in the Fig. 1 and Fig. 3, an internal circulation range hood comprises a housing 1, an air intake inlet 2, a fan 3, a cold compression chamber 4, an air guide outlet 5, and a cooling device 6. The air intake inlet 2 communicates with the cold compression chamber 4, and the cold compression chamber 4 communicates with the air guide outlet 5, that is, one end of the cold compression chamber 4 communicates with the air intake inlet 2, and the other end of the cold compression chamber communicates with the air guide outlet 5. The fan 3 is arranged at the air intake inlet 2 and has a certain cleaning effect on the oil vapor gas due to its centrifugal action.

[0018] The housing 1 is installed above a cooker in the form of a hood and has a hollow extractor chamber 11 inside. The air intake inlet 2 is arranged at a top of the extractor chamber 11, and the air guide outlet 5 is arranged at a lower edge of an inner wall of the extractor chamber 11, with an opening of the air guide outlet 5 facing the air intake inlet obliquely or directly.

[0019] As in Fig. As shown in Figure 4, the air guide outlet 5 has a plurality of holes arranged around the lower edge of the inner wall of the range hood 11 and arranged in the same orientation to ensure that the purified gas exiting the air guide outlet 5 has a common alignment property without generating mutual airflow interference. Furthermore, the air guide outlet 5 is arranged obliquely, and the direction of the purified gas exiting the air guide outlet 5 at an angle coincides with a rotation direction of the fan 3. That is, the purified gas exiting the air guide outlet does not directly face the air intake inlet, but faces the air intake inlet at an angle. Therefore, the purified gas exiting the air guide outlet 5 forms a cyclonic flow, which can improve the entrainment effect and reduce the electric power consumption of the fan.

[0020] As in Fig.As shown in Figure 5, the cooling device 6 includes a water inlet valve 61, a condenser 62, a water tank 63, and a water outlet valve 64. The condenser 62 communicates with the water tank 63, the water inlet valve 61 communicates with the condenser 62 or the water tank 63, the water outlet valve 64 communicates with the water tank 63, and the condenser 62 is disposed within the cold compression chamber 4 to form a water cooling system. Water for cooling enters the water cooling system via the water inlet valve 61. The cold water in the condenser 62 becomes hot water after absorbing the heat of the gas in the cold compression chamber 4 and then flows into the water tank 63. A user can then obtain the hot water in the water tank 63 through the water outlet valve 64.On the one hand, the cooling device 6 allows the gas in the cold compression chamber 4 to create a temperature difference with respect to the gas in the fume extraction chamber 11, facilitating the gas circulation flow. On the other hand, the cooling device allows the heated housing 1 to be cooled, protecting the electrical elements in the housing 1, and fully recovers the waste heat generated during cooking for reuse by the user. It should be noted that the cooling device 6 can also use a cooling fluid (medium) or cold air as a carrier for heat transfer, heat storage, and temperature reduction.

[0021] The extractor hood with internal circulation further comprises a cleaning device 7. The cleaning device 7 is arranged at any location in the housing 1 past which the gas flows, such as at the air intake inlet 2, in the cold compression chamber 4 or at the air guide outlet 5, and thus carries out a further cleaning treatment of the oil vapor gas.

[0022] The cleaning device 7 comprises a mechanical grease separator. The mechanical grease separator is arranged at the air intake inlet 2 to prevent grease from contaminating components in the housing 1.

[0023] The cleaning device 7 further comprises one or any combination of an electrostatic oil vapor cleaner, a HEPA filter, an activated carbon filter material, a photocatalyst filter, and an ultraviolet (UV) lamp, or the like. It should be noted that if the cleaning device 7 comprises a plurality of cleaning components and modules, the various cleaning components or modules may be arranged separately, i.e., at different locations where the gas flows in the housing 1.

[0024] The internal circulation extractor hood also includes a thermal insulation layer 8. The thermal insulation layer 8 is arranged around the extractor chamber 11 and can be arranged inside the extractor chamber 11 (i.e., on the inner wall of the extractor chamber 11) or outside the extractor chamber 11 (i.e., on the outer wall of the extractor chamber 11) to prevent the heat inside the extractor chamber 11 from being transferred to the interior of the cold compression chamber 4. This ensures a certain temperature difference between the cold compression chamber 4 and the extractor chamber 11 to improve efficiency and further protects the electrical elements inside the housing 1.

[0025] During operation of the internal circulation range hood, the oil vapor gas generated by cooking is sucked into the cold compression chamber 4 via the air intake inlet 2 by the suction generated by the fan 3, cooled by the cooling device 6, and then compressed and discharged to the air guide outlet 5, so that cooled and purified gas can be discharged at a certain speed to form an entrainment of oil vapor gas in the range hood 11, and with the addition of the viscous effect of the oil vapor gas itself and the suction of the fan 3, the cooled and purified gas entrains the oil vapor gas to re-enter the casing 1 for re-cooling and purification treatment, and so on.In other words, through the combined action of the fan, the exchange movement of cold and hot gas and the entrainment and siphon effect of the gas, the adsorption and purification function of the internal circulation for the oil vapor gas generated during cooking is achieved.

[0026] The preferred embodiments of the present disclosure have been described in detail above. It should be understood that those of ordinary skill in the art can make various modifications and changes in accordance with the spirit of the present disclosure without creative effort. Therefore, any technical solution that can be achieved through logical analysis, consideration, or limited experimentation based on the prior art by those skilled in the art in accordance with the spirit of the present disclosure falls within the scope defined by the claims.

Claims

[1] Extractor hood with internal circulation, comprising a housing (1), an air intake inlet (2), a fan (3), a cold compression chamber (4), an air guide outlet (5) and a cooling device (6), where the air intake inlet (2) is connected to the cold compression chamber (4) and the cold compression chamber (4) is connected to the air guide outlet (5); the fan (3) is arranged at the air intake inlet (2); the housing (1) is designed in the form of a hood and has a hollow extractor chamber (11) inside; the air intake inlet (2) is arranged on an upper side of the extractor chamber (11); the air guide outlet (5) is arranged at a lower edge of an inner wall of the extractor chamber (11), characterized by that an opening of the air guide outlet (5) faces obliquely or directly towards the air intake inlet (2). [2] Extractor hood with internal circulation according to claim 1, characterized by a cleaning device (7), wherein the cleaning device (7) is arranged at any location in the housing (1) past which gas flows. [3] Extractor hood with internal circulation according to claim 2, characterized by that the cleaning device (7) comprises a mechanical grease separation device, wherein the mechanical grease separation device is arranged at the air intake inlet (2). [4] Extractor hood with internal circulation according to claim 3, characterized by that the cleaning device (7) further comprises one or any combination of an electrostatic oil vapor cleaner, a HEPA filter, an activated carbon filter material, a photocatalyst filter and an ultraviolet lamp. [5] Extractor hood with internal circulation according to claim 1, characterized bythat the air guide outlet (5) has a plurality of holes arranged around the lower edge of the inner wall of the extractor chamber (11) and arranged in the same orientation. [6] Extractor hood with internal circulation according to claim 5, characterized by that the air duct outlet (5) is arranged obliquely and the direction of the gas exiting obliquely from the air duct outlet (5) corresponds to a direction of rotation of the fan (3). [7] Extractor hood with internal circulation according to claim 1, characterized bythat the cooling device (6) comprises a water inlet valve (61), a condenser (62), a water tank (63) and a water outlet valve (64), wherein the condenser (62) is connected to the water tank (63), the water inlet valve (61) is connected to the condenser (62) or the water tank (63), the water outlet valve (64) is connected to the water tank (63) and the condenser (62) is arranged within the cold compression chamber (4). [8] Extractor hood with internal circulation according to claim 1, characterized by that it further comprises a thermal insulation layer (8), wherein the thermal insulation layer (8) is arranged around the extractor chamber (11).

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