Kitchen waste gas waste heat and grease recovery device and range hood

Abstract

The utility model discloses a kitchen waste gas waste heat and grease recovery device and a range hood, and belongs to the field of kitchen waste gas treatment. The device comprises a cooking fume inner pipe provided with an air inlet, a grease collecting port and an air outlet and a condensation outer pipe provided with a water inlet and a water outlet, the condensation outer pipe is arranged on the cooking fume inner pipe in a sleeving mode to form a closed annular cavity, a spiral isolation piece or a staggered pin-fin row with an oval cross section is arranged in the annular cavity, the annular cavity is filled with water for condensation, and the condensation outer pipe is provided with a water inlet and a water outlet. Impurity-containing grease obtained through condensation of the condensate water in the annular cavity flows out of the collecting opening to be recycled, and the condensate water obtained after waste heat in the kitchen waste gas is recycled can be used for daily use. The device can recover grease and waste heat in the kitchen waste gas, and solves the problems of resource waste and environmental pollution in the kitchen waste gas emission process.

Description

Technical Field

[0001] This utility model relates to the field of kitchen waste gas treatment, and in particular to a kitchen waste gas waste heat and grease recovery device and a range hood. Background Technology

[0002] During food processing, the large amounts of hot cooking fumes produced contain oily substances such as grease vapors, aldehydes, ketones, hydrocarbons, esters, acids, alcohols, and aromatic compounds. The grease in these fumes can be recycled, for example, to produce biodiesel, making it a high-value recyclable. However, currently, household or kitchen range hoods directly exhaust these fumes outdoors, not only severely wasting the residual heat and grease in the exhaust gases but also polluting the air and causing serious health risks, including carcinogenicity.

[0003] Therefore, in response to the resource waste and environmental pollution caused by the direct emission of oil fumes from kitchen waste gas, it is necessary to design a device that can recover waste heat and grease from kitchen waste gas. Utility Model Content

[0004] This utility model provides a device for recovering waste heat and grease from kitchen exhaust gas and a range hood, aiming to solve the problems of waste heat and grease in kitchen exhaust gas and pollution in the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a kitchen waste heat and grease recovery device, including a telescopic duct, one end of which is connected to an oil extraction device, and the other end is connected to the air inlet of an inner fume duct. A grease collection port is provided on the inner fume duct near the air inlet, and the grease collection port is connected to an oil storage tank via a connector I, recovering the grease condensed inside the inner fume duct into the oil storage tank. A corresponding air outlet is also provided on the inner fume duct at the end opposite to the air inlet.

[0006] Furthermore, a condenser outer pipe is fitted onto the inner fume duct near the grease collection port, thereby forming a sealed annular cavity between the inner fume duct and the condenser outer pipe. The fitted sections of the inner fume duct and the condenser outer pipe are installed at an angle or vertically during use, allowing kitchen exhaust gases to be discharged upwards and outwards within the inner fume duct. The condenser outer pipe is filled with a condensing medium, which enters from the upper end and flows out from the lower end of the annular cavity. Specifically, the condensing medium is water. One end of the condenser outer pipe has a water outlet, and the other end has a water inlet. Water for condensation enters from the water inlet and flows out from the water outlet.

[0007] The outlet of the condenser pipe is connected to an external water pipe via connector II. The external water pipe is normally closed and is only opened when water is needed. After the external pipe is opened, water flows out of the outlet for daily use.

[0008] The inlet of the condenser pipe is connected to an external water pipe for connecting to an external water supply. Alternatively, a pressurized tap water supply can be connected. The tap water, serving as the condensing medium, can be connected from the tap water system to the inlet. After condensation, the tap water is then connected from the outlet back to the tap water system, thereby maintaining the condensate flow within the annular cavity and continuously recovering waste heat and condensing grease from the kitchen exhaust gas within the inner fume duct.

[0009] A sealed annular cavity is formed between the inner fume duct and the outer condenser duct, so that the condensate entering from the water inlet fills the annular cavity, condenses the inner fume duct section surrounded by the annular cavity, and then flows out from the water outlet.

[0010] Specifically, the annular cavity can be formed by fitting the inner fume duct and the outer condenser duct together concentrically and parallel in the longitudinal (length direction) direction to form the annular cavity.

[0011] The inner duct of the fume extraction system is inclined so that the condensed grease flows to the grease collection port under the action of gravity, and then flows into the oil storage tank.

[0012] The inner duct for grease fume can also be installed vertically, in which case the grease collection port is located on the inclined or arc transition section between the lower end of the annular cavity and the air inlet.

[0013] The inner duct of the fume extractor extends out of the annular cavity at the end away from the air inlet, and a bend may be formed at the position where it extends out of the annular cavity as needed.

[0014] A filter element, which can be a filter screen or a perforated filter plate, is installed at the upper part of the oil storage tank. This filter element is used to filter out various impurities contained in the oil.

[0015] A spiral isolator is provided inside the annular cavity, which isolates a spiral channel within the annular cavity, allowing water to flow along the channel. The flow pattern of the water along the channel is the flow direction, which enhances the condensation effect on the inner duct of the fume extractor.

[0016] Alternatively, several needle-like fins with elliptical or circular cross-sections can be provided in the annular cavity. These needle-like fins are arranged in rows within the annular cavity, with adjacent rows of needle-like fins staggered, so that the water flow in the annular cavity forms turbulence, thereby enhancing the condensation effect on the inner pipe of the fume extractor.

[0017] Obviously, the cross-sectional shape of the needle wing can be any suitable shape, such as a triangle or a square, in addition to an ellipse or a circle.

[0018] Water used for condensing kitchen exhaust gas enters the annular cavity through the inlet of the condenser outer pipe, condenses the kitchen exhaust gas in the inner fume pipe, and then flows out from the outlet of the condenser outer pipe.

[0019] Obviously, this utility model can also provide a new range hood that includes the kitchen exhaust heat and grease recovery device described above. For example, this kitchen exhaust heat and grease recovery device can be built into a range hood, or into or in conjunction with any other kitchen exhaust emission device, to solve the problem of resource waste and environmental pollution caused by the direct emission of kitchen exhaust heat and grease.

[0020] Compared with existing technologies, this kitchen exhaust gas waste heat and grease recovery device has a simple and reliable structure, low cost, and is suitable for condensing and recovering waste heat and grease from kitchen exhaust gas extracted by range hoods. It can utilize the waste heat in kitchen exhaust gas to heat tap water pipes for daily use, saving hot water costs, and can also recover and utilize grease in kitchen exhaust gas, reducing the emission of impurities in kitchen exhaust gas and reducing environmental pollution. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the kitchen waste gas waste heat and grease recovery device provided in this embodiment of the utility model;

[0022] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle BB section;

[0023] Figure 3 yes Figure 1 An enlarged schematic diagram of the structure at point A in one embodiment;

[0024] Figure 4 yes Figure 3 Schematic diagram of the unfolded state of the inner duct of the kitchen exhaust system;

[0025] Figure 5 yes Figure 1 An enlarged schematic diagram of the structure at point A in another embodiment;

[0026] Figure 6 yes Figure 5 Schematic diagram of the unfolded state of the inner duct of the kitchen exhaust system.

[0027] The following labels are used in the attached diagram: 1. Telescopic duct; 2. Inner fume duct; 21. Air inlet; 22. Bend; 23. Grease collection port; 31. Connector I; 32. Connector II; 4. Condenser outer pipe; 51. Water inlet; 52. Water outlet; 6. Filter element; 7. Oil storage tank; 8. Isolation element; 9. Flow direction; 10. Needle fin; 11. Annular cavity; 12. Spiral channel; 13. Oil extraction device. Detailed Implementation

[0028] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0029] like Figure 1 The image shown is an embodiment of the present invention.

[0030] This embodiment provides a kitchen exhaust gas waste heat and grease recovery device, including a telescopic duct 1. One end of the telescopic duct 1 is connected to an oil extraction device 13, and the other end is connected to an air inlet 21 of an inner fume duct 2. A grease collection port 23 is provided on the inner fume duct 2 near the air inlet 21. The grease collection port 23 is connected to an oil storage tank 7 via a connector I 31, recovering the grease condensed inside the inner fume duct 2 into the oil storage tank 7. A corresponding air outlet is also provided on the inner fume duct 2 at the end opposite to the air inlet 21.

[0031] Furthermore, a condenser outer pipe 4 is fitted onto the inner fume duct 2 near the grease collection port 23, thereby forming a sealed annular cavity 11 between the inner fume duct 2 and the condenser outer pipe 4. The fitted sections of the inner fume duct 2 and the condenser outer pipe 4 are installed at an angle or vertically during use, so that kitchen exhaust gases are discharged upwards and outwards within the inner fume duct 2. The condenser outer pipe 4 is filled with a condensing medium, which enters from the upper end and flows out from the lower end of the annular cavity 11. Specifically, the condenser outer pipe 4 has a water outlet 52 at one end and a water inlet 51 at the other end. Condensed water enters from the water inlet 51 and flows out from the water outlet 52.

[0032] It is understood that the outlet 52 of the condenser pipe 4 is connected to an external water pipe through connector II 32. The external water pipe is normally closed and is only opened when water is needed. After the external pipe is opened, the water flowing out of the outlet 52 will flow out for daily use.

[0033] It is understood that the inlet 51 of the condenser outer pipe 4 is connected to an external water pipe for external water supply. Of course, it can also be connected to pressurized tap water. The tap water, as the condensing medium, can be connected from the tap water pipe system to the inlet 51. After condensation, the tap water is then connected from the outlet 52 back to the tap water pipe system, thereby keeping the condensate water flow in the annular cavity 11 in a flowing state and continuously recovering waste heat and condensing grease from the kitchen exhaust gas in the fume inner pipe 2.

[0034] Furthermore, the inner fume pipe 2 and the outer condenser pipe 4 are concentrically and parallelly fitted together longitudinally (in the length direction), forming a sealed annular cavity 11 between the inner fume pipe 2 and the outer condenser pipe 4. This allows the condensate entering from the inlet 51 to fill the annular cavity 11, condense the section of the inner fume pipe 2 surrounded by the annular cavity 11, and then flow out from the outlet 52.

[0035] It is understood that the inner pipe 2 of the fume extraction tube is inclined so that the condensed grease flows to the grease collection port 23 under the action of gravity, and then flows into the oil storage tank 7.

[0036] Alternatively, the inner fume duct 2 can also be set vertically, in which case the grease collection port 23 is set on the inclined or arc transition section between the lower end of the annular cavity 11 and the air inlet 21.

[0037] Furthermore, the inner fume duct 2 extends out of the annular cavity 11 at the end away from the air inlet 21, and a bend 22 may be formed at the position where it extends out of the annular cavity 11 as needed.

[0038] Furthermore, a filter element 6 is provided at the upper part of the oil storage tank 7. The filter element 6 can be a filter screen or a perforated filter plate. It is used to filter out various impurities contained in the oil.

[0039] Alternatively, a spiral isolator 8 is provided in the annular cavity 11, which isolates a spiral channel 12 in the annular cavity 11, allowing water to flow along the spiral channel 12. The flow pattern of the water along the spiral channel 12 is a flow direction 9, which enhances the condensation effect on the inner pipe of the fume extractor 2.

[0040] Alternatively, a number of elliptical cross-section needle wings 10 can be provided in the annular cavity 11. The needle wings 10 are arranged in rows in the annular cavity 11, with adjacent rows staggered, so that the water flow forms turbulence in the annular cavity 11, which enhances the condensation effect on the inner pipe of the fume duct 2.

[0041] It is understood that the cross-sectional shape of the needle wing 10 can be any suitable shape, such as a triangle or a square, in addition to an ellipse or a circle.

[0042] It is understood that the water used to condense the kitchen exhaust gas enters the annular cavity 11 from the inlet 51 of the condenser outer pipe 4, condenses the kitchen exhaust gas in the oil fume inner pipe 2, and then flows out from the outlet 52 of the condenser outer pipe 4.

[0043] Alternatively, this kitchen exhaust heat and grease recovery device can be built into a range hood or any other kitchen exhaust emission device, or used in conjunction with it, to solve the problem of resource waste and environmental pollution caused by the direct emission of kitchen exhaust heat and grease.

[0044] Compared with existing technologies, this kitchen exhaust gas waste heat and grease recovery device has a simple and reliable structure, low cost, and is suitable for condensing and recovering waste heat and grease from kitchen exhaust gas extracted by range hoods. It can utilize the waste heat in kitchen exhaust gas to heat tap water pipes for daily use, saving hot water costs, and can also recover and utilize grease in kitchen exhaust gas, reducing the emission of impurities in kitchen exhaust gas and reducing environmental pollution.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A kitchen exhaust waste heat and grease recovery device, characterized in that: The oil fume inner tube is provided with an air inlet, a grease collecting port and an air outlet in sequence. The condensing outer tube is sleeved outside the oil fume inner tube segment between the grease collecting port and the air outlet, so that a closed annular cavity is formed between the oil fume inner tube and the condensing outer tube, and the annular cavity is filled with condensing medium to condense the kitchen waste gas in the oil fume inner tube segment surrounded by the annular cavity.

2. The kitchen waste gas waste heat and oil recovery device according to claim 1, characterized in that: The sleeved segment of the oil fume inner tube and the condensing outer tube is installed in an inclined or vertical state in use, so that the kitchen waste gas is discharged upward and outward in the oil fume inner tube, and the condensing medium enters from the upper end of the annular cavity and flows out from the lower end.

3. The kitchen waste gas waste heat and oil recovery device according to claim 2, characterized in that: A spiral separator is arranged in the annular cavity, and the separator separates a spiral channel in the annular cavity, so that the condensing medium flows along the spiral channel.

4. The kitchen waste gas waste heat and oil recovery device according to claim 2, characterized in that: A plurality of needle fins with an elliptical or circular cross section are arranged in the annular cavity, and the adjacent needle fins are arranged in staggered positions, so that the water flow forms a turbulent flow in the annular cavity.

5. The waste heat and grease recovery device for kitchen exhaust according to claim 2, 3 or 4, characterized in that: The condensing medium is water, the condensing outer tube is provided with a water inlet at the upper end and a water outlet at the lower end, and the water for condensation enters the annular cavity from the water inlet and flows out of the water outlet of the condensing outer tube.

6. The kitchen waste gas waste heat and oil recovery device according to claim 5, characterized in that: The water inlet is connected with a water inlet pipe, and the water outlet is connected with a water pipe through a joint II, and the water pipe is in a normally closed state and is opened only when water is used.

7. The kitchen waste gas waste heat and oil recovery device according to claim 5, characterized in that: Tap water as the condensing medium is connected to the water inlet from a tap water system, and the condensed tap water is connected to the water outlet from the tap water system, so that the condensing water flow in the annular cavity is kept in a flowing state, and the kitchen waste gas in the oil fume inner tube is continuously subjected to waste heat recovery and grease condensation.

8. The waste heat and grease recovery device for kitchen exhaust according to claim 2, 3 or 4, characterized in that: The grease containing impurities obtained by condensation of the condensing medium in the annular cavity flows to the grease collecting port of the oil fume inner tube under the action of gravity, and the grease collecting port is connected to the pipeline of the oil storage tank through a joint I to recover the condensed grease in the oil fume inner tube into the oil storage tank.

9. The waste heat and grease recovery device for kitchen exhaust according to claim 2, 3 or 4, wherein: The oil fume inner tube and the condensing outer tube are longitudinally and parallelly sleeved.

10. A range hood characterized by: The kitchen waste gas waste heat and grease recovery device comprises the kitchen waste gas waste heat and grease recovery device according to any one of claims 1-9.

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