Waste heat recovery device and steaming oven comprising same

Abstract

The utility model provides a waste heat recovery device and a steaming oven comprising the same, the waste heat recovery device is used for the steaming oven, the waste heat recovery device comprises a heat exchange pipe and a water tank, the water tank comprises a water inlet and a water outlet, the water inlet is communicated with a water source, the heat exchange pipe is arranged in the water tank, and the inlet end of the heat exchange pipe is communicated with an exhaust port of the steaming oven; the waste heat recovery device further comprises a filtering device, the filtering device is arranged below the water tank, and the outlet end of the heat exchange pipe is communicated with the filtering device. A heat exchange pipe is arranged in the water tank, heat exchange water in the water tank can make full contact with the heat exchange pipe, the inlet end of the heat exchange pipe communicates with an exhaust port of the steaming oven and is used for receiving hot waste gas generated when the steaming oven works, and the hot waste gas exchanges heat with the heat exchange water in the water tank through the heat exchange pipe. The filtering device is arranged, waste gas obtained after heat exchange is completed is filtered and then exhausted, oil smoke particles in the waste gas are prevented from polluting air, and oil smoke purification of the steaming and baking waste gas is achieved.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliances, and in particular to a waste heat recovery device and a steam oven including the same. Background Technology

[0002] Currently, most household steam ovens on the market directly release the hot exhaust gases generated during steaming and baking into the outside environment without any measures or methods to utilize or treat them.

[0003] The hot exhaust gas produced when a steam oven is working contains a lot of energy, but it is not utilized, which greatly reduces the energy efficiency of the steam oven. On the other hand, the hot exhaust gas also contains a considerable amount of air pollutants, and ignoring it will also lead to a decrease in indoor air quality. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defect that the hot exhaust gas generated by the use of the steam oven is directly discharged without being utilized, resulting in energy waste and air pollution, and to provide a waste heat recovery device and a steam oven including the same.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A waste heat recovery device is provided for a steam oven. The waste heat recovery device includes a heat exchange tube and a water tank. The water tank includes an inlet and an outlet. The inlet is connected to a water source. The heat exchange tube is disposed inside the water tank, and its inlet end is connected to the exhaust port of the steam oven. The waste heat recovery device also includes a filter device disposed below the water tank. The outlet end of the heat exchange tube is connected to the filter device.

[0007] In this solution, heat exchange tubes are installed inside the water tank, allowing the hot water in the tank to fully contact the tubes. The inlet end of the heat exchange tubes is connected to the exhaust port of the steam oven to receive the hot exhaust gas generated during operation. The hot exhaust gas then exchanges heat with the hot water in the tank through the heat exchange tubes. A filtration device is installed to filter the exhaust gas after heat exchange before discharge, preventing oil fume particles in the exhaust gas from polluting the air, thus achieving oil fume purification of the steam oven exhaust gas.

[0008] Preferably, a temperature detection device is installed inside the water tank, a first solenoid valve is installed at the water inlet, and a second solenoid valve is installed at the water outlet. The first solenoid valve, the second solenoid valve, and the temperature detection device are electrically connected.

[0009] In this solution, by installing a temperature detection device inside the water tank, and electrically connecting the temperature detection device to the first and second solenoid valves, the second solenoid valve at the outlet opens when the temperature detection device detects that the hot water in the water tank has reached the set temperature, discharging the water that has completed heat exchange for the user. After the drainage is completed, the first solenoid valve at the inlet starts, re-injecting the hot water and starting a new round of heat exchange. This not only makes full use of the unused heat energy in the waste gas, but also meets part of the user's hot water needs.

[0010] Preferably, the filtration device includes an electrostatic adsorption field and a filter screen, which are stacked along the smoke exhaust direction.

[0011] In this scheme, the electrostatic adsorption field is used to ionize and adsorb oil fume particles in the exhaust gas, and the filter screen is used to further filter the waste oil fume. The electrostatic adsorption field and the filter screen are stacked along the exhaust direction, so that the exhaust gas is filtered layer by layer in sequence, ensuring that the exhaust gas is fully filtered and improving the filtration effect.

[0012] Preferably, the filter device further includes an oil cup, which is disposed below the filter device and is detachably connected to the filter device.

[0013] In this design, the oil cup is located at the bottom to collect waste oil after filtering oil fume particles, which avoids the oil fumes from not being collected and ensuring that the steam oven will be covered in oil stains. The detachable design allows the oil cup to be removed and cleaned as needed, keeping the steam oven hygienic.

[0014] Preferably, the filter device is configured as a multi-layer drawer-type structure, and the filter device moves relative to the opening direction of the steam oven, and the filter device is detachably connected to the housing of the waste heat recovery device.

[0015] In this design, the filter unit is configured as a drawer for easy disassembly. The pull-out design allows users to easily observe the filter unit's condition and enables cleaning as needed, ensuring effective filtration. Furthermore, the filter unit moves relative to the opening of the steam oven, and the pull-out design places it on one side of the oven opening, minimizing its space-consuming nature.

[0016] Preferably, the waste heat recovery device and the steam oven have a contact surface, the inlet end of the heat exchange tube is located at the top of the contact surface, and the outlet end of the heat exchange tube is located at the bottom of the water tank.

[0017] In this solution, by placing the heat exchange tube inlet at the top of the contact surface, the inlet is closer to the oven, avoiding the need for long pipes that would take up too much internal space in the oven. The outlet is placed at the bottom, allowing the oil fume particles in the exhaust gas to flow to the outlet by gravity, thus preventing them from settling at the inlet and causing oil stains to accumulate, making it difficult to clean and clogging the exhaust gas, which would affect the heat exchange rate.

[0018] Preferably, an air pump is provided at the inlet end of the heat exchange tube, the air pump is connected to the inner wall of the contact surface, and the heat exchange tube is connected to the exhaust port of the steam oven through the air pump.

[0019] In this solution, the exhaust pump can draw the hot exhaust gas generated by the steam oven into the heat exchange tube more quickly, avoiding the stagnation of hot exhaust gas and the resulting reduction in heat exchange efficiency. At the same time, the heat exchange tube is connected to the exhaust port of the steam oven through the exhaust pump, which can effectively prevent the hot exhaust gas from leaking at the junction and flowing into the air without heat exchange and filtration, thus reducing indoor air quality.

[0020] Preferably, the heat exchange tubes are bent and extended multiple times inside the water tank to form a tortuous pipeline layout.

[0021] In this design, the heat exchange tubes are bent and extended multiple times to form a longer pipeline, which lengthens the movement path of the hot exhaust gas in the water tank and prolongs the heat exchange time with the hot water in the tank, enabling more thorough heat exchange and improving energy utilization.

[0022] Preferably, the water inlet is located at the top of the water tank and is connected to the water source via a pipe. The water outlet is located at the bottom of the water tank and is connected to the water inlet of the waste heat recovery device. The water inlet is located on the side of the waste heat recovery device facing the opening of the steam oven.

[0023] In this design, the water inlet is located at the top of the water tank, allowing water to flow to the outlet at the bottom of the tank by gravity after entering. This not only extends the water flow path, enabling sufficient heat exchange within the tank, but also eliminates the need for additional pressurization devices, allowing all the heat-exchanged water to be discharged from the outlet. The design is simple and inexpensive. Furthermore, the water inlet is located on the side of the waste heat recovery device facing the opening of the steam oven, making it convenient for users to collect water.

[0024] This utility model provides a steam oven, which includes the waste heat recovery device described in any of the above-mentioned claims.

[0025] The positive and progressive effects of this utility model are as follows: By installing a heat exchange tube inside the water tank, the hot water inside the tank can fully contact the heat exchange tube. The inlet end of the heat exchange tube is connected to the exhaust port of the steam oven to receive the hot exhaust gas generated during the operation of the steam oven. The hot exhaust gas exchanges heat with the hot water in the water tank through the heat exchange tube. By installing a temperature detection device inside the water tank, and electrically connecting the temperature detection device to the first and second solenoid valves, when the temperature detection device detects that the hot water in the tank has reached the set temperature, the second solenoid valve at the outlet opens, discharging the water that has undergone heat exchange for the user. After the drainage is completed, the first solenoid valve at the inlet starts, re-injecting hot water and starting a new round of heat exchange. This not only makes full use of the unused heat energy in the hot exhaust gas, but also meets part of the user's hot water needs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the internal structure of the waste heat recovery device according to an embodiment of the present invention. The arrows in the diagram are used to indicate the direction of water flow.

[0027] Figure 2 This is an exploded view of the waste heat recovery device and filtration device according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the waste heat recovery device housing and oil cup according to an embodiment of the present utility model;

[0029] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0030] Figure 5 This is a schematic diagram of the structure of the steam oven and its contact surface according to an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the waste heat recovery device and contact surface according to an embodiment of the present invention.

[0032] Figure 7 This is a schematic diagram of the overall structure of the steam oven according to an embodiment of the present utility model.

[0033] Explanation of reference numerals in the attached figures:

[0034] Waste heat recovery device 1

[0035] Casing 11

[0036] Tank 111

[0037] Water inlet 12

[0038] Water tank 2

[0039] Inlet 21

[0040] Outlet 22

[0041] Temperature detection device 23

[0042] First solenoid valve 24

[0043] Second solenoid valve 25

[0044] Heat exchanger tube 3

[0045] Import end 31

[0046] Export end 32

[0047] Air pump 33

[0048] Filter device 4

[0049] Electrostatic adsorption field 41

[0050] Filter screen 42

[0051] Oil cup 43

[0052] Hook 431

[0053] Water source pipeline 5

[0054] Contact surface 6

[0055] Steam oven 7 Detailed Implementation

[0056] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0057] In this embodiment, as Figure 1-7 As shown, a waste heat recovery device 1 is provided for use in a steam oven 7. The waste heat recovery device 1 includes a heat exchange tube 3 and a water tank 2. The water tank 2 includes an inlet 21 and an outlet 22. The inlet 21 is connected to a water source. The heat exchange tube 3 is disposed inside the water tank 2. The inlet end 31 of the heat exchange tube 3 is connected to the exhaust port of the steam oven 7. The waste heat recovery device 1 also includes a filter device 4. The filter device 4 is disposed below the water tank 2. The outlet end 32 of the heat exchange tube 3 is connected to the filter device 4.

[0058] By installing heat exchange tubes 3 inside the water tank 2, the hot water inside the water tank 2 can fully contact the heat exchange tubes 3. The inlet end 31 of the heat exchange tubes 3 is connected to the exhaust port of the steam oven 7 to receive the hot exhaust gas generated during the operation of the steam oven 7. The hot exhaust gas exchanges heat with the hot water in the water tank 2 through the heat exchange tubes 3. A filter device 4 is installed to filter the exhaust gas after heat exchange before discharge, avoiding air pollution from oil fume particles in the exhaust gas, thus achieving oil fume purification of the steam oven exhaust gas.

[0059] Among them, such as Figure 1As shown, a temperature detection device 23 is installed inside the water tank 2, a first solenoid valve 24 is installed at the inlet 21, and a second solenoid valve 25 is installed at the outlet 22. The first solenoid valve 24, the second solenoid valve 25, and the temperature detection device 23 are electrically connected. By installing the temperature detection device 23 inside the water tank 2, and electrically connecting the temperature detection device 23 to the first solenoid valve 24 and the second solenoid valve 25, when the temperature detection device 23 detects that the hot water in the water tank 2 has reached the set temperature, the second solenoid valve 25 at the outlet 22 opens, discharging the water that has undergone heat exchange for the user. After the drainage is completed, the first solenoid valve 24 at the inlet 21 starts, re-injecting hot water and starting a new round of heat exchange. This not only makes full use of the unused heat energy in the waste gas but also meets part of the user's hot water needs.

[0060] Specifically, in this embodiment, a thermocouple is selected as the temperature detection device 23. The thermocouple is fixed to the inner wall of the water tank 2. In other embodiments, other detection devices can also be selected to cooperate with the solenoid valve so that the heat energy in the exhaust gas can be fully utilized.

[0061] In this embodiment, as Figure 1-2 As shown, the filtration device 4 includes an electrostatic adsorption field 41 and a filter screen 42, which are stacked along the exhaust direction. The electrostatic adsorption field 41 is used to ionize and adsorb oil fume particles in the exhaust gas, and the filter screen 42 is used to further filter the waste oil fume. The stacking of the electrostatic adsorption field 41 and the filter screen 42 along the exhaust direction ensures that the exhaust gas is filtered layer by layer, guaranteeing thorough filtration and improving the filtration effect. In other possible embodiments, the filtration method and the arrangement of the filtration device 4 are not specifically limited, as long as the oil fume particles in the exhaust gas are sufficiently filtered.

[0062] Specifically, the filter screen 42 has a grid structure, which can better filter oil fume particles in the exhaust gas. After use, it can be removed and cleaned regularly, or a new filter screen 42 can be replaced to avoid clogging of the filter screen 42 and reducing the filtration efficiency.

[0063] Furthermore, the filter device 4 also includes an oil cup 43, which is located below the filter device 4 and is detachably connected to it. The oil cup 43, positioned at the bottom, collects waste oil after filtering oil fume particles, preventing the filtered oil fumes from being uncollected and ensuring the steam oven 7 doesn't accumulate grease. Its detachable design allows the oil cup 43 to be easily removed for cleaning as needed, maintaining the hygiene of the steam oven 7. In other embodiments, other components can be used to collect the waste oil, as long as the filtered waste oil does not negatively impact the kitchen environment.

[0064] Among them, such as Figure 2As shown, the filter device 4 is configured with a multi-layer drawer-type structure, and it moves relative to the opening of the steam oven 7. The filter device 4 is detachably connected to the housing 11 of the waste heat recovery device 1. The drawer-type structure of the filter device 4 facilitates user disassembly, and the pull-out design allows for easy observation of the filter device 4. It can be disassembled for cleaning as needed, ensuring the filtration effect. Furthermore, the filter device 4 moves relative to the opening of the steam oven 7, and the pull-out design is located on one side of the opening of the steam oven 7, minimizing its space occupation in the kitchen. In other possible embodiments, the filter device 4 can also be designed with other structures to achieve a detachable connection with the waste heat recovery device 1.

[0065] Specifically, in this embodiment, such as Figure 3-4 As shown, a hook 431 is provided on one side of the oil cup 43, and the hook 431 is arranged along the length direction of the oil cup 43. A groove 111 is provided on the waste heat recovery housing 11, and the shape of the hook 431 is adapted to the groove 111. The oil cup 43 can be hung into the waste heat recovery device 1 through the hook 431, or it can be pulled out along the groove 111 for easy disassembly and treatment of waste oil for cleaning. In other possible embodiments, the oil cup 43 can also be connected to the housing 11 of the waste heat recovery device 1 in other ways, as long as the oil cup 43 is detachable and easy to clean.

[0066] In this embodiment, as Figure 5-6 As shown, the waste heat recovery device 1 and the steam oven 7 have a contact surface 6. The inlet end 31 of the heat exchange tube 3 is located at the top of the contact surface 6, and the outlet end 32 of the heat exchange tube 3 is located at the bottom of the water tank 2. By placing the inlet end 31 of the heat exchange tube 3 at the top of the contact surface 6, the inlet end 31 is closer to the steam oven 7, avoiding the need for a long pipeline that would occupy the internal volume of the steam oven 7. The outlet end 32 is located at the bottom, allowing the oil fume particles in the hot exhaust gas to flow to the outlet end 32 by gravity, preventing the oil fume particles from settling at the inlet end 31, which would make it difficult to clean, clog the hot exhaust gas, and affect the heat exchange rate. In other possible embodiments, the positions of the inlet end 31 and the outlet end 32 of the heat exchange tube 3 can also be adjusted with other components, as long as the hot exhaust gas can pass smoothly through the heat exchange tube 3.

[0067] Furthermore, an air pump 33 is installed at the inlet end 31 of the heat exchange tube 3. The air pump 33 is connected to the inner wall of the contact surface 6, and the heat exchange tube 3 is connected to the exhaust port of the steam oven 7 through the air pump 33. The air pump 33 can more quickly draw the hot exhaust gas generated by the steam oven 7 into the heat exchange tube 3, avoiding the stagnation of hot exhaust gas, which would reduce the heat exchange efficiency. At the same time, the connection between the heat exchange tube 3 and the exhaust port of the steam oven 7 through the air pump 33 can effectively prevent the hot exhaust gas from leaking at the junction, allowing unexchanged and unfiltered hot exhaust gas to flow into the air, resulting in a decrease in indoor air quality.

[0068] Specifically, such as Figure 1 As shown, the heat exchange tube 3 is bent and extended multiple times inside the water tank 2, forming a tortuous pipe layout. The multiple bends and extensions of the heat exchange tube 3 create a longer pipe layout, which prolongs the movement path of the hot exhaust gas within the water tank 2 and extends the heat exchange time with the hot water in the water tank 2, enabling more thorough heat exchange and improving energy utilization. In other possible embodiments, the shape of the heat exchange tube 3 is not specifically limited, as long as the hot exhaust gas in the heat exchange tube 3 can have sufficient contact with the hot water.

[0069] In this embodiment, the inlet 21 is located at the top of the water tank 2 and is connected to the water source pipe 5. The outlet 22 is located at the bottom of the water tank 2 and is connected to the inlet 12 of the waste heat recovery device 1. The inlet 12 is located on the side of the waste heat recovery device 1 facing the opening of the steam oven 7. The inlet 21 being located at the top of the water tank 2 allows water to flow to the outlet 22 at the bottom of the water tank 2 by gravity after entering. This not only extends the water flow path, allowing for sufficient heat exchange within the water tank 2, but also eliminates the need for other pressurization devices, enabling all the heat-exchanged water to be discharged from the outlet 22. The structure is simple and cost-effective. Furthermore, the inlet 12 being located on the side of the waste heat recovery device 1 facing the opening of the steam oven 7 facilitates water collection for the user. In other embodiments, the positions of the inlet and outlet 22 can be adjusted according to actual usage, in conjunction with other devices, as long as the hot water can be discharged normally.

[0070] In this embodiment, as Figure 7 As shown, a steam oven 7 is provided, which includes the waste heat recovery device 1 provided above.

[0071] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A waste heat recovery device for a steam oven, characterized in that, The waste heat recovery device includes a heat exchange tube and a water tank. The water tank includes an inlet and an outlet. The inlet is connected to a water source. The heat exchange tube is installed inside the water tank. The inlet end of the heat exchange tube is connected to the exhaust port of the steam oven. The waste heat recovery device also includes a filtration device, which is located below the water tank, and the outlet end of the heat exchange tube is connected to the filtration device.

2. The waste heat recovery device as described in claim 1, characterized in that, The water tank is equipped with a temperature detection device, a first solenoid valve is installed at the water inlet, and a second solenoid valve is installed at the water outlet. The first solenoid valve, the second solenoid valve, and the temperature detection device are electrically connected.

3. The waste heat recovery device as described in claim 1, characterized in that, The filtration device includes an electrostatic adsorption field and a filter screen, which are stacked along the smoke exhaust direction.

4. The waste heat recovery device as described in claim 1, characterized in that, The filter device also includes an oil cup, which is located below the filter device and is detachably connected to the filter device.

5. The waste heat recovery device as described in claim 1, characterized in that, The filter device is configured with a multi-layer drawer-type structure, and the filter device can move relative to the opening of the steam oven. The filter device is detachably connected to the housing of the waste heat recovery device.

6. The waste heat recovery device as described in claim 1, characterized in that, The waste heat recovery device and the steam oven have a contact surface, the inlet end of the heat exchange tube is located at the top of the contact surface, and the outlet end of the heat exchange tube is located at the bottom of the water tank.

7. The waste heat recovery device as described in claim 6, characterized in that, An air pump is installed at the inlet end of the heat exchange tube. The air pump is connected to the inner wall of the contact surface. The heat exchange tube is connected to the exhaust port of the steam oven through the air pump.

8. The waste heat recovery device as described in claim 1, characterized in that, The heat exchange tubes are bent and extended multiple times inside the water tank, forming a tortuous pipeline layout.

9. The waste heat recovery device as described in claim 1, characterized in that, The water inlet is located at the top of the water tank and is connected to the water source pipe. The water outlet is located at the bottom of the water tank and is connected to the water inlet of the waste heat recovery device. The water inlet is located on the side of the waste heat recovery device facing the opening of the steam oven.

10. A steam oven, characterized in that, The steam oven includes a waste heat recovery device as described in any one of claims 1-9.

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