A stove-fume exhauster linkage residual heat recovery heat collection water supply device and use method

Abstract

This invention belongs to the field of kitchen waste heat recovery technology, and discloses a stove-range hood linked waste heat recovery and hot water supply device and its usage method. It includes a first heat-absorbing device installed on the outer periphery of the stove core, and a second heat-absorbing device installed inside the exhaust pipe of the range hood. The first and second heat-absorbing devices are connected in parallel to a water pipe between a cold water tank and an insulated water tank. A double-layered air duct is fitted around the exhaust pipe, with a pre-reserved double-layered air duct between it and the exhaust pipe. A blower is installed at one end of the double-layered air duct, and the other end is connected to the kitchen ceiling air outlet. It also includes a flow control system, which includes a controller, a solenoid valve on the water pipe connected to the controller, an infrared sensor installed on the outer periphery of the stove core, and a concentration and temperature sensor array installed inside the exhaust pipe. The blower is electrically connected to the controller. This invention has the technical advantages of low difficulty in modifying existing kitchen structures, improved heat exchange efficiency, enhanced heat recovery, and guaranteed sufficient heat exchange.

Description

Technical Field

[0001] This invention belongs to the field of kitchen waste heat recovery technology, specifically relating to a stove-range hood linked waste heat recovery and hot water supply device and its usage method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] When cooking with a gas stove, some of the heat generated by combustion is used to heat the food, while some is dissipated through flame radiation and exhaust fumes, resulting in a waste of heat resources. Existing technology discloses a heat exchange system for dual utilization of waste heat from a kitchen range hood. This system absorbs heat from the stovetop radiation and fumes through a flame thermal radiation convection heat exchange system, and the fumes temperature difference transfer heat exchange system absorbs the heat from the fumes and transfers it to the water in the water tank. However, because the flame thermal radiation convection heat exchange system is integrated into the range hood's suction surface, it cannot directly recover heat from the stovetop, and the fumes cause dirt to accumulate on the surface of the flame thermal radiation convection heat exchange system, reducing its heat exchange efficiency.

[0004] To this end, existing technology also discloses a waste heat recovery and utilization system for a hotel kitchen, including a stove core and a range hood. A heat absorption pipe is integrated inside the smoke collection hood of the range hood, and a hot water absorption tank is concentrically arranged around the stove core. The heat absorption pipe and the hot water absorption tank are connected in series on a circulating water pipe, which is connected to a temperature-regulating water tank and a heat-insulating water tank. A strip scraper is fitted on the heat absorption pipe to scrape off the oil stains on the heat absorption pipe.

[0005] While the above solutions can absorb heat from the stovetop and cooking fumes, they still have the following drawbacks:

[0006] The above solution integrates heat-absorbing pipes and strip scrapers inside the range hood's smoke collection hood. While this avoids dirt buildup on the heat-absorbing pipe surface and reduced heat exchange efficiency, it requires disassembling and modifying existing range hoods or replacing them with the solution. This modification process involves disassembling or replacing existing equipment, making it difficult to adapt to the structure of range hoods already installed in home kitchens, thus increasing implementation costs. In addition, the above solution's series design of the heat-absorbing pipes and the hot water tank reduces the temperature difference between the cooling water after it is heated by the first heat exchanger and the second heat exchanger, weakening the heat transfer and reducing heat exchange efficiency. Furthermore, the fixed cooling water flow rate of the above solution cannot match different cooking temperatures and heat source intensities, easily leading to insufficient heat exchange or energy waste. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a stove-range hood linkage waste heat recovery and hot water supply device and its usage method, which can effectively solve the technical problems of existing technology being unable to effectively transform existing kitchens and low heat exchange efficiency and insufficient heat exchange.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] In a first aspect, a stove-range hood linkage waste heat recovery and hot water supply device is provided, including a stove and a range hood. A first heat absorption device is provided on the outer periphery of the stove core of the stove, and a second heat absorption device is provided in the exhaust pipe of the range hood. The first heat absorption device and the second heat absorption device are connected in parallel on the water pipe between the cold water tank and the heat preservation water tank.

[0010] A sandwich duct is fitted around the exhaust pipe, and a sandwich duct is reserved between the exhaust pipe and the exhaust pipe; an exhaust fan is installed at one end of the sandwich duct and the other end is connected to the kitchen ceiling air outlet.

[0011] The device also includes a flow control system, which includes a controller, a solenoid valve on a water pipe connected to the controller, an infrared sensor installed on the outer periphery of the stove core, and a concentration and temperature sensor array installed inside the exhaust pipe; the induced draft fan is electrically connected to the controller.

[0012] Preferably, the solenoid valve includes a first solenoid valve installed on a first cold water pipe at the bottom of the cold water tank, and a second solenoid valve installed on a second cold water pipe at the bottom of the cold water tank. The first cold water pipe is connected to a first heat absorption device, and the second cold water pipe is connected to a second heat absorption device.

[0013] Preferably, the first heat-absorbing device includes a spiral coil, the outer periphery of which is wrapped with a heat insulation layer, the top end of which is connected to a first cold water pipe, and the bottom end of which is connected to an insulated water tank through a first hot water pipe.

[0014] Preferably, a first temperature sensor is installed on the first cold water pipe, and a second temperature sensor is installed on the first hot water pipe; both the first and second temperature sensors are connected to a controller, and the controller has a preset temperature difference range between the first and second temperature sensors.

[0015] Preferably, the bottom end of the heat insulation layer is fixedly connected to a support buckle, the support buckle is detachably connected to the stove, and a silicone anti-slip pad is provided between the support buckle and the stove.

[0016] Preferably, the second heat absorption device includes a shell-and-tube heat exchanger, with one end of the shell-and-tube heat exchanger located below the end of the flue gas outlet of the flue gas pipe. An oil collection hole is opened at the bottom end of the flue gas outlet of the flue gas pipe, and the oil collection hole is connected to an oil collection cup. An oil filter screen can be detachably installed at the flue gas inlet of the flue gas pipe.

[0017] Preferably, the top of one end of the shell-and-tube heat exchanger at the flue gas outlet is connected to a second cold water pipe, and the bottom of one end of the shell-and-tube heat exchanger at the flue gas inlet is connected to an insulated water tank via a second hot water pipe; a third temperature sensor is installed on the second cold water pipe, and a fourth temperature sensor is installed on the second hot water pipe; both the third and fourth temperature sensors are connected to a controller, and the controller has a preset temperature difference range between the third and fourth temperature sensors.

[0018] Preferably, the controller is connected to an audible and visual alarm, and the controller is also preset with the minimum temperature difference threshold between the third and fourth temperature sensors when the second solenoid valve is fully open.

[0019] Preferably, the top of the cold water tank is connected to a tap water pipe, the cold water tank is equipped with a water level sensor, a water supply solenoid valve is installed on the tap water pipe, the water level sensor and the water supply solenoid valve are connected to a controller, and the controller has a preset water level range for the cold water tank.

[0020] Secondly, the method of using the above-mentioned stove-range hood linked waste heat recovery and hot water supply device is provided, and the specific steps include:

[0021] Fill the cold water tank with cold water, and input or change the preset data to the controller;

[0022] The controller first controls the first or second solenoid valve to open or close based on the detection data from the infrared sensor and the concentration and temperature sensor array.

[0023] The controller then adjusts the opening of the first or second solenoid valve based on the temperature data from the first and second temperature sensors, or the temperature data from the third and fourth temperature sensors.

[0024] In winter, the controller starts the induced draft fan based on the temperature of the oil fume detected by the concentration and temperature sensor array; in summer, the induced draft fan is turned off.

[0025] Compared with the prior art, the advantages and positive effects of this invention are:

[0026] The first heat-absorbing device of this invention is installed on the stovetop, and the second heat-absorbing device is installed inside the exhaust pipe. This eliminates the need to disassemble or replace the existing range hood in a home kitchen, thus reducing the difficulty of modifying the existing kitchen structure. The first and second heat-absorbing devices of this invention adopt a parallel heat exchange method to increase the heat exchange temperature difference. By using an infrared sensor installed in the stove core and a concentration and temperature sensor array installed in the exhaust pipe, the cooking status of the stovetop is identified, and the flow rate of the first and second heat-absorbing devices is dynamically adjusted, which has the technical effects of improving heat exchange efficiency, increasing heat recovery rate, and ensuring sufficient heat exchange. Attached Figure Description

[0027] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0028] Figure 1 This is a schematic cross-sectional view of a stove-range hood linkage waste heat recovery and hot water supply device according to Embodiment 1 or Embodiment 2 of the present invention;

[0029] Figure 2 This is a cross-sectional view of the first heat-absorbing device of Embodiment 1 or Embodiment 2 of the present invention;

[0030] Figure 3 This is a top view of the first heat-absorbing device of Embodiment 1 or Embodiment 2 of the present invention;

[0031] Figure 4 This is a perspective view of the spiral coil of Embodiment 1 or Embodiment 2 of the present invention;

[0032] Figure 5 This is a side view of the second heat-absorbing device of Embodiment 1 or Embodiment 2 of the present invention;

[0033] Figure 6 This is a side view of the shell-and-tube heat exchanger of Embodiment 1 or Embodiment 2 of the present invention;

[0034] In the picture:

[0035] 1. Water supply solenoid valve; 2. Cold water tank; 3. First solenoid valve; 4. Second solenoid valve; 5. First temperature sensor; 6. Spiral coil; 7. Insulation layer; 8. Support buckle; 9. Insulated water tank; 10. Exhaust pipe; 11. Infrared sensor; 12. Second temperature sensor; 13. Spiral inner groove; 14. Silicone anti-slip mat; 15. Range hood; 16. Extension pipe; 17. Ceiling air outlet; 18. Third temperature sensor; 19. Exhaust fan; 20. Concentration sensor; 21. Fourth temperature sensor; 22. Oil collection hole; 23. Shell and tube heat exchanger; 24. Fifth temperature sensor; 25. Oil filter screen; 26. Jacketed air duct. Detailed Implementation

[0036] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0037] The present invention will now be described in detail with reference to the accompanying drawings.

[0038] Example 1

[0039] This embodiment discloses a stove-range hood linked waste heat recovery and hot water supply device (hereinafter referred to as "recovery and collection device"), such as... Figure 1 As shown, the device includes a stove and a range hood 15, which are common cooking appliances in kitchens. The stove provides the heat source for cooking, while the range hood is responsible for exhausting the exhaust gases generated during cooking. To achieve waste heat recovery, the heat recovery collection device in this embodiment is equipped with heat-absorbing components at key locations on both the stove and the range hood 15. Specifically, in this embodiment, a first heat-absorbing device is installed on the outer periphery of the stove core, and a second heat-absorbing device is installed inside the exhaust pipe 10 of the range hood 15; the first and second heat-absorbing devices are connected in parallel to the water pipe between the cold water tank 2 and the insulated water tank 9.

[0040] In this embodiment, the first heat-absorbing device is installed on the outer periphery of the stove core to capture the radiant and convective heat of the flame and heat the flowing medium. The second heat-absorbing device is installed inside the exhaust pipe 10 of the range hood to recover heat from the high-temperature oil fume exhaust and heat the flowing medium. The heated medium is stored in the insulated water tank 9 via a water pipe. The outlet of the insulated water tank 9 is connected to the hot water demand end of the kitchen faucet or dishwasher. When the water temperature reaches the standard of 40-50℃, it can be directly supplied for use.

[0041] Understandably, compared to the existing technology that integrates the heat absorption system into the smoke extraction surface of the range hood, this embodiment installs the second heat absorption device inside the exhaust pipe 10 of the range hood 15, which avoids replacing or disassembling the range hood. Only the existing exhaust pipe needs to be modified or replaced. It can be adapted to the structure of the range hood already installed in the family kitchen, avoiding the increase in implementation costs of kitchen waste heat recovery modification.

[0042] It should also be noted that in this embodiment, the first heat-absorbing device and the second heat-absorbing device are connected in parallel on the water pipe between the cold water tank 2 and the insulated water tank 9, so that the cold water in the cold water tank 2 can flow through the two heat-absorbing devices at the same time, respectively absorbing the residual heat of the stove and the residual heat of the oil fume exhaust gas. The heated water flows into the insulated water tank 9 for storage after merging.

[0043] This embodiment employs a parallel heat exchange method to increase the heat exchange temperature difference. Based on the core formula of the heat balance method according to the law of conservation of energy: Q = K × A × Δtm, we know that Δtm is the average heat exchange temperature difference, which is the core influencing factor on the heat exchange capacity. In the formula, Q represents the heat exchange capacity, K is the overall heat transfer coefficient, and A is the heat exchange area. Under the premise that K and A are fixed, the larger the average heat exchange temperature difference Δtm, the larger the heat exchange capacity Q. In the series structure, after the cold water is heated by the first heat exchanger, Δtm decreases significantly, causing the heat exchange capacity of the second heat exchanger to decrease exponentially. However, in the parallel structure of this embodiment, it is ensured that the cold water can enter the two heat absorption devices at a relatively low initial temperature at the same time. The cold water in both heat exchangers is at the initial water temperature, thus maintaining a large temperature difference at both heat sources. Δtm always remains at its maximum value, and the heat exchange capacity of the two heat exchangers does not decrease. The total heat exchange capacity is the direct sum of the two, making the heat exchange capacity of the parallel structure greater, effectively improving the overall heat transfer efficiency and heat recovery.

[0044] To further recover waste heat from the kitchen and improve the kitchen environment, such as Figure 1 As shown, a sandwiched air duct is fitted around the outer periphery of the exhaust pipe 10, forming a sandwiched air duct 26 between the sandwiched air duct and the exhaust pipe 10. A blower 19 is installed at one end of the sandwiched air duct 26 away from the range hood, and the other end is connected to the ceiling air outlet 17 of the kitchen. In this embodiment, the sandwiched air duct guides airflow across the outer wall of the exhaust pipe 10 to recover waste heat from the outer wall of the exhaust pipe 10 and exhaust the heated air, which can assist in kitchen heating during winter.

[0045] Understandably, a sandwich duct is a larger diameter pipe that is coaxial with the exhaust pipe, forming a sandwich duct that allows air to flow over the outer surface of the exhaust pipe, thereby absorbing the heat emitted by the exhaust pipe.

[0046] In this embodiment, as Figures 1 to 3 As shown, the heat recovery collection device also includes a flow control system, which includes a controller, an electromagnetic valve installed on the water pipe connected to the controller, an infrared sensor 11 installed on the outer periphery of the stove core, and a concentration and temperature sensor array installed inside the exhaust pipe.

[0047] It should be noted that the solenoid valve is an electric valve installed on the water pipe. By receiving instructions from the flow control system controller, it can control the opening and closing of the water pipe or adjust the flow rate. The infrared sensor 11 has high temperature resistance and is used to detect the infrared radiation intensity of the stove flame in a non-contact manner, thereby determining the flame size or cooking temperature. The concentration and temperature sensor array is used to monitor the oil fume concentration and temperature in the exhaust pipe. The infrared sensor 11 and the concentration and temperature sensor array transmit the monitoring data to the controller. The controller can classify the current working state of the stove into different working states according to the preset flame size range and the preset smoke concentration and temperature range, such as high heat for frying (high smoke, large flame), medium heat for steaming (low smoke, medium flame), and low heat for simmering (no smoke, small flame). The controller can control the opening, closing, or opening degree of the solenoid valve according to the current working state of the stove, thereby adjusting the water flow in the water pipe.

[0048] In this embodiment, the controller is connected to the control panel. The control panel is used to turn on the heat recovery collection device of this embodiment, and preset data is input or changed to the controller through the control panel.

[0049] For example, after receiving data from the infrared sensor 11 and the concentration and temperature sensor array, the controller determines that the stove is currently in a high-heat frying / stir-frying state based on preset flame size ranges and preset smoke concentration and temperature ranges. In this case, the controller instructs the solenoid valve on the water pipe to increase its opening, increasing the water flow through the two heat-absorbing devices to improve heat recovery efficiency and prevent overheating or insufficient heat exchange due to slow water flow. Conversely, when the stove is in a medium-heat steaming or low-heat simmering state, the infrared sensor 11 detects a lower flame intensity, and the concentration and temperature sensor array in the exhaust pipe 10 detects a lower oil fume temperature and concentration. The controller then instructs the solenoid valve group to sequentially decrease its opening, reducing the water flow to ensure that the water can fully absorb heat and prevent insufficient heat exchange due to excessive water flow. Through the dynamic adaptive adjustment of the flow control system for the waste heat recovery process, efficient waste heat recovery is ensured under different cooking conditions.

[0050] like Figure 1 As shown, this embodiment includes a concentration and temperature sensor array installed inside the exhaust pipe, comprising a fifth temperature sensor 24 at the exhaust inlet and a concentration sensor 20 at the exhaust outlet. The fifth temperature sensor 24 and the concentration sensor 20 monitor the changes in the temperature and concentration of the oil fumes in real time, transmitting the data to the controller. This dynamically adjusts the opening of the solenoid valve on the water pipe, achieving precise sensing of the oil fume conditions and dynamic matching of water flow, effectively solving the problem of low heat transfer efficiency caused by a fixed flow design.

[0051] It is understandable that when there is no data transmission between the infrared sensor 11 and the concentration and temperature sensing array, the controller controls the first solenoid valve and the second solenoid valve to remain closed.

[0052] In this embodiment, the controller can be a programmable logic controller (PLC). The exhaust fan 19 is electrically connected to the controller. In winter, the controller controls the exhaust fan 19 to start based on the oil fume temperature detected by the concentration and temperature sensor array (when the oil fume temperature is in the frying or steaming state). The air in the kitchen is introduced into the interlayer air duct 26 to exchange heat with the exhaust pipe 10 to form warm air. The warm air is discharged from the ceiling air outlet 17 to raise the kitchen temperature. In summer, the exhaust fan 19 is turned off.

[0053] Compared to existing technologies with a fixed flow rate of the medium, which cannot match different cooking conditions and heat source intensities during cooking and can easily lead to insufficient heat exchange or energy waste, the flow control system in this embodiment achieves variable flow rate adaptive heat exchange. This ensures that the water flow rate can be effectively matched with the heat source intensity in different cooking scenarios, such as high-heat frying and low-heat simmering, thereby improving heat recovery efficiency, avoiding energy waste, and ensuring the stability of the water supply temperature.

[0054] In this embodiment, as Figure 1 As shown, the solenoid valve assembly includes a first solenoid valve 3 installed on a first cold water pipe at the bottom of the cold water tank 2, and a second solenoid valve 4 installed on a second cold water pipe at the bottom of the cold water tank 2. The first cold water pipe is connected to a first heat-absorbing device, and the second cold water pipe is connected to a second heat-absorbing device. It can be understood that the first and second cold water pipes simultaneously deliver cold water to the first and second heat-absorbing devices at a relatively low initial temperature. The advantage of this design is that the parallel design allows the two cold water streams to independently absorb their respective heat sources, avoiding mutual constraints on heat transfer. If a series structure were used, the water heated after flowing through the second heat-absorbing device would have difficulty effectively absorbing the residual heat from the stove. In this embodiment, the first and second solenoid valves are electromagnetic proportional regulating valves.

[0055] In this embodiment, solenoid valves are designed on the two cold water pipes to further refine the working state of the stove. For example, when the stove is simmering soup over low heat, if the pot on the stove is covered, resulting in low smoke concentration and temperature in the exhaust pipe, the controller can determine from the data of the concentration and temperature sensor array and infrared sensor 11 that the heat of the smoke in the exhaust pipe is low. The second cold water pipe entering the exhaust pipe for heat exchange might cause the temperature of the insulated water tank to drop. In this case, only the first solenoid valve can be opened while the second solenoid valve is closed. This is because, under this condition, the cold water in the second cold water pipe cannot effectively recover heat in the exhaust pipe 10, and the cold water flowing through the second heat absorption device is at a low temperature, ultimately lowering the overall temperature of the insulated water tank. However, under steaming / cooking conditions, the flame on the stove is larger, and the smoke temperature is relatively higher than that of soup simmering. The controller can open both the first and second solenoid valves by 30%, allowing both cold water lines to run at low flow rates to fully absorb the low-intensity heat source under steaming / cooking conditions.

[0056] It is understandable that by connecting two heat absorption devices to two cold water pipes respectively, and installing a solenoid valve on each of the two cold water pipes, the flow control mode of the flow control system can be expanded, the flexibility of the flow control system can be increased, the heat recovery efficiency can be further improved, energy waste can be avoided, and the stability of the water supply temperature can be guaranteed.

[0057] like Figures 1 to 3 As shown, the first heat absorption device includes a spiral coil 6, with an insulation layer 7 wrapped around its outer periphery. The top end of the spiral coil 6 is connected to a first cold water pipe, and the bottom end of the spiral coil is connected to an insulated water tank 9 via a first hot water pipe. A first temperature sensor 5 is installed on the first cold water pipe, and a second temperature sensor 12 is installed on the first hot water pipe. Both the first temperature sensor 5 and the second temperature sensor 12 are connected to a controller, which presets the temperature difference range between the first temperature sensor 5 and the second temperature sensor 12.

[0058] like Figure 4 As shown, the spiral coil 6 also has a spiral inner groove 13 machined inside to increase the heat exchange area and heat exchange capacity. In this embodiment, the spiral coil 6 is made of stainless steel, with a spiral angle of 15°, 5 turns, a pipe wall thickness of 1.5mm, high thermal conductivity, and a temperature resistance of over 300℃. The spiral coil 6 has a height of 7cm, an inner diameter of 14cm, and an inner pipe diameter of 1cm. The spiral coil 6 is arranged to fit within the flame radiation range of the stove to capture the radiant heat emitted by the flame. The outer side of the spiral coil 6 is wrapped with a heat insulation layer 7, which can reduce heat loss while avoiding the risk of burns. In this embodiment, the heat insulation layer 7 is a ceramic fiber fireproof heat insulation layer.

[0059] In this embodiment, the first temperature sensor 5 and the second temperature sensor 12 provide direct feedback on the heat exchange of the current flow rate of the spiral coil 6. The controller can adjust the opening of the first solenoid valve on the first cold water pipe based on the temperature difference data fed back by the first temperature sensor 5 and the second temperature sensor 12, combined with the flame size information detected by the infrared sensor 11, and the preset temperature difference range of the first temperature sensor 5 and the second temperature sensor 12 within the controller. For example, when a high-heat frying condition is detected, the controller controls both solenoid valves to open. If the temperature difference between the first temperature sensor and the second temperature sensor is large, it indicates that the water flow rate of the first cold water pipe is still insufficient. The controller can increase the opening of the first solenoid valve to increase the water flow rate and prevent the spiral coil 6 from overheating.

[0060] When simmering over low heat, the controller can further reduce the opening of the first solenoid valve based on the temperature difference data fed back by the first temperature sensor 5 and the second temperature sensor 12. This reduces the water flow and prolongs the heat exchange time, ensuring that heat is fully absorbed and thus optimizing heat exchange efficiency. This control mode improves heat exchange efficiency while, in conjunction with the insulation layer, reduces the rate of heat loss to the environment, increasing the efficiency of radiant heat recovery from the stove by more than 30%.

[0061] like Figures 1 to 3 As shown, the bottom end of the heat insulation layer 7 is fixedly connected to a support buckle 8. A groove is formed on the bottom surface of the support buckle 8, and a silicone anti-slip pad 14 is placed inside the groove. The groove of the support buckle 8 is fastened to the stovetop, and the silicone anti-slip pad 14 fills the space between the stovetop and the support buckle 8. It can be understood that the first heat-absorbing device in this embodiment is detachably connected to the stovetop via the support buckle 8, requiring no drilling or welding. It is compatible with common household stovetop materials such as marble, stainless steel, and tempered glass, making installation and disassembly convenient and facilitating regular cleaning of grease. The silicone anti-slip pad 14, filling and engaging between the support buckle 8 and the stovetop, utilizes the principle of interference fit to increase the stability of the connection between the support buckle 8 and the stovetop, while preventing damage to the stovetop surface and facilitating renovation of existing kitchens.

[0062] like Figure 1 As shown, the second heat absorption device includes a shell-and-tube heat exchanger 23 installed axially along the exhaust pipe 10. The shell-and-tube heat exchanger 23 is located at one end of the exhaust pipe 10 outlet, lower than the exhaust pipe 10 inlet. An oil collection hole 22 is provided at the bottom end of the exhaust pipe outlet for connecting an oil collection cup. An oil filter screen 25 can also be detachably installed at the exhaust pipe 10 inlet. The oil collection hole can be designed with a screw cap for easy emptying of oil.

[0063] It should be noted that using a shell-and-tube heat exchanger 23 can increase the heat exchange area and improve the heat exchange efficiency, and the shell-and-tube heat exchanger 23 is easily adaptable to the exhaust pipes of common range hoods. In this embodiment, the diameter of the range hood exhaust pipe is 180mm, and the diameter of the shell-and-tube heat exchanger 23 is 150mm. Figure 6 As shown, the shell-and-tube heat exchanger 23 has multiple inner tubes. In this embodiment, the inner tube diameter is 10 mm, the number of inner tubes is 32, the effective heat exchange length is 0.7 m, and it is set in the middle section of the flue gas pipe to recover residual heat in the high-temperature waste gas.

[0064] It should also be noted that an oil filter screen 25 can be detachably installed at the smoke inlet of the exhaust pipe 10, which can further filter the oil fumes filtered in the range hood 15, preventing oil stains from adhering to the shell-and-tube heat exchanger 23. In addition, the oil fumes after being filtered by the oil filter screen 25 may still contain a small amount of oil stains. In this embodiment, the shell-and-tube heat exchanger is installed in the exhaust pipe at an angle, and an oil collection hole is provided at the bottom of the smoke outlet to connect to an oil collection cup. This allows the small amount of oil stains in the oil fumes to flow naturally to the oil collection hole at the bottom of the smoke outlet of the exhaust pipe under the action of gravity, preventing oil stains from accumulating on the surface of the heat exchanger to form a heat insulation layer and ensuring the stability of heat exchange efficiency.

[0065] It is understood that the second heat absorption device in this embodiment uses a shell-and-tube heat exchanger 23, which is installed inside the exhaust pipe 10. Compared with the heat absorption system integrated into the smoke extraction surface of the range hood in the prior art, it does not require disassembly and modification of the existing main structure of the range hood, greatly reducing the renovation cost of the home kitchen. It is also understood that regardless of whether the existing exhaust pipe of the home kitchen is a flexible pipe or an inclined pipe, the existing exhaust pipe can be changed to the horizontal pipe of this embodiment, and the modification difficulty is low.

[0066] like Figure 1 As shown, the top of the shell-and-tube heat exchanger 23 at the flue gas outlet is connected to the second cold water pipe, and the bottom of the shell-and-tube heat exchanger 23 at the flue gas inlet is connected to the insulated water tank 9 through the second hot water pipe; a third temperature sensor 18 is installed on the second cold water pipe, and a fourth temperature sensor 21 is installed on the second hot water pipe. The controller presets the temperature difference range between the third temperature sensor 18 and the fourth temperature sensor 21.

[0067] In this embodiment, the high-temperature oil fumes flow from the inlet to the outlet within the exhaust pipe 10, with the temperature gradually decreasing along the flow direction. The design of connecting the second cold water pipe and the second hot water pipe to the shell-and-tube heat exchanger 23 is such that the cold water flows in counter-currently from the high-temperature exhaust gas end. It should be noted that the cold water enters the shell-and-tube heat exchanger 23 from the top of the outlet via the second cold water pipe, forming the maximum initial temperature difference with the high-temperature oil fumes. Subsequently, the water continuously absorbs heat as it flows towards the second hot water pipe, and finally flows out from the bottom of the shell-and-tube heat exchanger 23 via the second hot water pipe. This design effectively avoids the problem of decreased heat transfer efficiency caused by the rapid decay of the temperature difference in a co-current design, ensuring a stable and efficient heat exchange process and increasing the heat exchange capacity per flow.

[0068] In this embodiment, the third temperature sensor 18 and the fourth temperature sensor 21 monitor the inlet and outlet water temperatures of the shell-and-tube heat exchanger 23 in real time. The controller can also adjust the opening of the second solenoid valve 4 based on the temperature difference data between the third temperature sensor 18 and the fourth temperature sensor 21, thereby adjusting the water flow rate in the second heat absorption device.

[0069] It should be noted that in this embodiment, the controller is connected to an audible and visual alarm. The controller also has a preset minimum temperature difference threshold between the third temperature sensor 18 and the fourth temperature sensor 21 when the second solenoid valve 4 is fully open. When the second solenoid valve 4 is fully open, if the temperature difference between the third temperature sensor 18 and the fourth temperature sensor 21 reaches the minimum temperature threshold, it indicates that a large amount of oil is attached to the surface of the shell-and-tube heat exchanger 23, reducing the heat exchange efficiency of the shell-and-tube heat exchanger 23. The controller then activates the audible and visual alarm, prompting the user to disassemble the exhaust pipe 10 to clean the shell-and-tube heat exchanger 23.

[0070] In this embodiment, as Figure 1 As shown, the top of the cold water tank 2 is connected to a tap water pipe, and a water supply solenoid valve 1 is installed on the tap water pipe. In this embodiment, a water level sensor is installed inside the cold water tank 2. Both the water level sensor and the water supply solenoid valve 1 are connected to a controller. The controller has a preset water level range for the cold water tank. When the water level in the cold water tank is low, the controller controls the water supply solenoid valve 1 to supply water to the cold water tank 2. When the water level in the cold water tank reaches a high level, the controller controls the water supply solenoid valve 1 to close, thus preventing the entire device from drying out. It should be noted that the cold water tank 2 is installed higher than the first and second heat absorption devices, and is installed below the stove with the insulated water tank 9, so that gravitational potential energy can be used to assist water circulation, reducing the use of the circulation pump.

[0071] In this embodiment, the cold water tank 2 is located on the upper left of the stove, with a capacity of 60L, and is made of food-grade 304 stainless steel, which has anti-corrosion and anti-aging properties; the insulated water tank 9 is located directly below the stove, with a capacity of 60L, the inner liner is made of food-grade stainless steel, and the outer layer is wrapped with a polyurethane insulation layer, which can keep the water warm for more than 8 hours, reducing secondary heat loss; the bottom of the insulated water tank 9 is reserved with a drain outlet, and a drain valve is installed on the drain outlet for easy regular cleaning and maintenance; the drain valve can be a ball valve, which is convenient for users to regularly discharge sediment.

[0072] In this embodiment, an extension pipe 16 is also provided on the exhaust pipe 10. The extension pipe 16 is used to connect to the steam pipe of the disinfection cabinet (if there is one in the existing kitchen) to further increase the heat source of the second heat absorption device. If there is no disinfection cabinet in the existing kitchen, the extension pipe 16 is sealed with a sealing plug.

[0073] Example 2

[0074] This embodiment discloses a method for using a stove-range hood linked waste heat recovery and hot water supply device. It applies a stove-range hood linked waste heat recovery and hot water supply device disclosed in Embodiment 1. Specific steps include:

[0075] Fill the cold water tank with cold water, turn on the heat recovery device through the control panel, and input or change the preset data to the controller;

[0076] During cooking, the controller determines the current working status of the stove based on the flame intensity of the stove core detected by the infrared sensor 11, the oil fume concentration and temperature detected by the temperature sensor array, and controls the first solenoid valve or the second solenoid valve to open or close.

[0077] The controller then adjusts the opening of the first or second solenoid valve based on the temperature data from the first and second temperature sensors, or the temperature data from the third and fourth temperature sensors.

[0078] In winter, the controller starts the exhaust fan 19 based on the temperature of the oil fume detected by the concentration and temperature sensor array. This draws air from the kitchen into the interlayer air duct 26 to exchange heat with the exhaust pipe 10, forming warm air. The warm air is then discharged from the ceiling air outlet 17, raising the kitchen temperature. In summer, the exhaust fan 19 is turned off.

[0079] Regularly disassemble the oil filter screen 25 to clean the oil, pour out the oil from the oil collection cup, and open the drain port at the bottom of the insulated water tank for cleaning.

[0080] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A stove-exhaust hood linkage heat recovery heat collection water supply device, comprising a stove and an exhaust hood, characterized in that, The stove core is provided with a first heat-absorbing device on its outer periphery, and the range hood exhaust pipe is provided with a second heat-absorbing device; the first heat-absorbing device and the second heat-absorbing device are connected in parallel to the water pipe between the cold water tank and the heat preservation water tank. The exhaust pipe is fitted with a sandwiched air duct, and a sandwiched air duct is reserved between the sandwiched air duct and the exhaust pipe; an exhaust fan is installed at one end of the sandwiched air duct and the other end is connected to the kitchen ceiling air outlet. The device also includes a flow control system, which includes a controller, an electromagnetic valve on a water pipe connected to the controller, an infrared sensor installed on the outer periphery of the stove core, and a concentration and temperature sensor array installed inside the exhaust pipe; the induced draft fan is electrically connected to the controller. The solenoid valve includes a first solenoid valve installed on a first cold water pipe at the bottom of the cold water tank, and a second solenoid valve installed on a second cold water pipe at the bottom of the cold water tank. The first cold water pipe is connected to a first heat absorption device, and the bottom of the first heat absorption device is connected to the insulated water tank through a first hot water pipe. The second heat absorption device includes a shell-and-tube heat exchanger. The end of the shell-and-tube heat exchanger located at the flue outlet is lower than the end of the flue inlet. An oil collection hole is opened at the bottom of the flue outlet, and the oil collection hole is connected to an oil collection cup. An oil filter screen can be detachably installed at the flue inlet. The top of the end of the shell-and-tube heat exchanger located at the flue outlet is connected to a second cold water pipe, and the bottom of the end of the shell-and-tube heat exchanger located at the flue inlet is connected to an insulated water tank through a second hot water pipe. A first temperature sensor is installed on the first cold water pipe, and a second temperature sensor is installed on the first hot water pipe; both the first and second temperature sensors are connected to a controller, and the controller has a preset temperature difference range between the first and second temperature sensors. A third temperature sensor is installed on the second cold water pipe, and a fourth temperature sensor is installed on the second hot water pipe. Both the third and fourth temperature sensors are connected to a controller, which has a preset temperature difference range between them.

2. The stove-range hood linked waste heat recovery and hot water supply device as described in claim 1, characterized in that, The first heat absorption device includes a spiral coil with an insulation layer wrapped around its outer periphery. The top end of the spiral coil is connected to the first cold water pipe, and the bottom end of the spiral coil is connected to an insulated water tank through a first hot water pipe.

3. The stove-range hood linked waste heat recovery and hot water supply device as described in claim 2, characterized in that, The bottom end of the heat insulation layer is fixedly connected to a support buckle, which is detachably connected to the stove. A silicone anti-slip pad is provided between the support buckle and the stove.

4. The stove-range hood linked waste heat recovery and hot water supply device as described in claim 1, characterized in that, The controller is connected to an audible and visual alarm. The controller also has a preset minimum temperature difference threshold between the third and fourth temperature sensors when the second solenoid valve is fully open.

5. The stove-range hood linked waste heat recovery and hot water supply device as described in claim 1, characterized in that, The top of the cold water tank is connected to a tap water pipe. The cold water tank is equipped with a water level sensor and a water supply solenoid valve is installed on the tap water pipe. The water level sensor and the water supply solenoid valve are connected to a controller, which has a preset water level range for the cold water tank.

6. The method of using a stove-range hood linked waste heat recovery and hot water supply device as described in any one of claims 1-5, characterized in that, The specific steps include: Fill the cold water tank with cold water, and input or change preset data to the controller; The controller first controls the first or second solenoid valve to open or close based on the detection data from the infrared sensor and the concentration and temperature sensor array. The controller then adjusts the opening of the first or second solenoid valve based on the temperature data from the first and second temperature sensors, or the temperature data from the third and fourth temperature sensors. In winter, the controller starts the induced draft fan based on the temperature of the oil fume detected by the concentration and temperature sensor array; in summer, the induced draft fan is turned off.

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