Waste heat reuse stove
By installing a water storage tank and a flue pipe in the stove, the waste heat from the furnace wall and the flue pipe is used to heat the water, and the water temperature is automatically controlled by the control system. This solves the problems of large size, high cost, and scalding hazards of existing stoves, and achieves efficient and energy-saving hot water supply and safe use.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 权翠华
- Filing Date
- 2025-08-21
- Publication Date
- 2026-06-30
AI Technical Summary
Existing stoves are large, inconvenient to use, expensive, have low heat exchange efficiency, cannot boil water simultaneously, and pose a safety hazard of burns to chefs, making them difficult to meet the needs of the modern catering industry.
Design a waste heat recovery stove with integrated water storage function. By setting up a water storage tank and a flue pipe in the stove body, the waste heat of the furnace wall and the flue pipe is used to heat the water in two ways. The water temperature is automatically controlled by the control system to achieve continuous hot water supply and safe isolation.
It achieves efficient use of waste heat to heat water, avoids chefs getting scalded, saves kitchen space, provides a stable hot water supply, reduces production costs, is suitable for widespread use, and has strong adaptability.
Smart Images
Figure CN224434484U_ABST
Abstract
Description
Technical Field
[0001] This technical solution relates to the field of kitchen cooking equipment technology, specifically a waste heat recycling stove. Background Technology
[0002] As we all know, stoves are essential and crucial cooking equipment in the catering industry. However, existing stoves present several problems in their use: First, chefs often need additional water-boiling equipment when cooking, which takes up kitchen space and complicates the process, affecting work efficiency; second, the flame intensity of catering industry stoves far exceeds that of household stoves, and the high temperatures generated by gas stoves can easily burn chefs, posing a significant safety hazard; third, existing energy-saving stoves mainly use coal and wood as the medium, resulting in large stove volumes, inconvenient use, high costs, low heat exchange efficiency, and poor water boiling performance, making it difficult to meet the needs of modern catering businesses (especially the large proportion of small and medium-sized restaurants).
[0003] Therefore, there is an urgent need for a stove that can simultaneously boil water, prevent chefs from getting scalded, and is also small in size, easy to use, low in cost, and highly adaptable to be widely adopted. Utility Model Content
[0004] This utility model aims to solve the aforementioned problems in the existing technology by providing a waste heat recovery stove with integrated water storage function. This addresses issues such as large size, inconvenience of use, high cost, low heat exchange efficiency, inability to heat water simultaneously, and poor adaptability, hindering widespread adoption. The specific solution is as follows.
[0005] The waste heat recovery stove includes a stove body with an inverted cone-shaped furnace in the middle. The stove body is characterized by having a water storage tank surrounding the furnace. The water inlet of the water storage tank is located below the stove body, and the water outlet of the water storage tank is located above the stove body and leads to the outer wall of the stove body. The exhaust pipe is arranged in a ring around the furnace and suspended in the water storage tank. The exhaust inlet of the exhaust pipe is opened on the furnace wall, and the exhaust outlet of the exhaust pipe leads to the outer wall of the stove body.
[0006] The stove body is shaped like a platform, and the width of the water storage tank gradually narrows from the bottom to the top, meaning the space decreases from large to small.
[0007] The stove body can be configured to consist of an annular upper shell and a lower shell, with the lower shell having a wider annular ring than the upper shell.
[0008] The upper and lower shells are connected by a surface with multiple water passage holes spaced apart.
[0009] The lower shell has two stages, with the upper part being the middle shell.
[0010] The exhaust pipe is circular, with its exhaust inlet and exhaust outlet adjacent to each other and separated by a partition.
[0011] The water storage tank is equipped with a drain pipe. The top of the drain pipe is located at the top of the water storage tank, i.e., the water outlet of the water storage tank. The bottom of the drain pipe extends through the lower side wall of the stove body and leaves a connector on the outside.
[0012] The distance between the top of the drain pipe and the top of the water storage tank is 1.5-3 cm.
[0013] The water outlet and inlet of the water storage tank are located diagonally opposite the stove.
[0014] The cooktop has a control box on its outer wall. The control box includes a temperature sensor, a control system, and a solenoid valve. The temperature sensor is located at the water outlet to detect the water temperature, and the solenoid valve is located at the water inlet to control the water intake. The control system acquires the water temperature electrical signal and controls the opening and closing of the solenoid valve. The control system is a W1411 digital thermostat, which includes three sets of displays (2+3+2), five buttons (stop heating + stop cooling + on / off setting + start heating + start cooling), and five wires (2 power cords + 2 probe cords + 2 output cords).
[0015] The control box, the external connector of the drain pipe, and the smoke exhaust outlet are located adjacent to each other for easy unified management.
[0016] The furnace chamber has a central hole at the bottom, and gas stove mounting holes are distributed around the central hole.
[0017] This technical solution achieves the following technical effects:
[0018] Because the stove body has a water storage tank (double layer) that isolates the human body from the flames, burns to workers are prevented. At the same time, it fully utilizes the residual heat from the furnace wall and exhaust pipe to heat the water twice, resulting in high heating efficiency. Workers can continuously collect hot water while cooking, eliminating the need for additional water heating equipment, saving kitchen space. The collected hot water has a wide range of uses, including washing pots and pans, washing vegetables, washing hands, and replenishing hot water in pots, achieving energy-saving and environmentally friendly technological effects.
[0019] The hot and cold water in the water storage tank inside the stove is layered and orderly, ensuring a continuous and stable supply of hot water throughout the entire system. Furthermore, the automatic control system ensures that water is naturally discharged and collected once it reaches the designated temperature, eliminating the need for manual supervision and making it more convenient to use.
[0020] Compared to existing technologies, this device is smaller and has a lower production cost, making it very suitable for widespread adoption, especially for low-cost catering entrepreneurs.
[0021] This device has excellent compatibility and can be installed on most gas stoves on the market. The center hole at the bottom of the burner can also supplement air for gas stove combustion, ensuring stable combustion. Attached Figure Description
[0022] Figure 1 This is a disassembled structural diagram of Embodiment 1 of this utility model;
[0023] Figure 2 This is a cross-sectional structural diagram of Embodiment 1 of this utility model from the drain pipe;
[0024] Figure 3 This is a cross-sectional structural diagram of Embodiment 1 of this utility model from the smoke exhaust port;
[0025] Figure 4 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model. Figure 1 ;
[0026] Figure 5 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model. Figure 2 ;
[0027] Figure 6 This is a cross-sectional structural diagram of Embodiment 2 of this utility model.
[0028] Explanation of reference numerals in the attached drawings: 1 Upper shell, 2 Middle shell, 3 Water passage hole, 4 Furnace wall, 4-1 Smoke vent, 5 Smoke pipe, 5-1 Smoke inlet, 5-2 Smoke outlet, 6 Drain pipe, 7 Lower shell, 7-1 Center hole, 7-2 Mounting hole, 7-3 Water inlet, 8 Control box, 8-1 Temperature sensor. Detailed Implementation
[0029] Example 1, see appendix Figure 1-5 The waste heat recovery stove includes a stove body with an inverted cone-shaped furnace in the middle. The stove body is characterized by having a water storage tank surrounding the furnace. The water inlet 7-3 of the water storage tank is located below the stove body, and the water outlet of the water storage tank is located above the stove body and leads to the outer wall of the stove body. The exhaust pipe 5 is arranged in a ring around the furnace and suspended in the water storage tank. The exhaust inlet 5-1 of the exhaust pipe is opened on the furnace wall 4, and the exhaust outlet 5-2 of the exhaust pipe leads to the outer wall of the stove body.
[0030] The stove body is shaped like a platform, and the width of the water storage tank gradually narrows from the bottom to the top, meaning the space decreases from large to small.
[0031] The stove body is configured to consist of an annular upper shell 1 and a lower shell 7, with the lower shell having a wider ring than the upper shell.
[0032] The upper shell and the lower shell are connected by a cover, and multiple water passage holes 3 are spaced apart.
[0033] The lower shell has two stages, with the upper part being the middle shell 2.
[0034] The exhaust pipe is circular, with its exhaust inlet and exhaust outlet adjacent to each other and separated by a partition.
[0035] The water storage tank is equipped with a drain pipe 6. The top of the drain pipe is located at the top of the water storage tank, i.e., the water outlet of the water storage tank, and the bottom of the drain pipe passes through the lower side wall of the stove body and leaves a connector on the outside.
[0036] The distance between the top of the drain pipe and the top of the water storage tank is 1.5-3 cm.
[0037] The water outlet and inlet of the water storage tank are located diagonally opposite the stove.
[0038] The outer wall of the stove is equipped with a control box 8, which includes a temperature sensor 8-1, a control system, and a solenoid valve. The temperature sensor is located at the water outlet to detect the water temperature, and the solenoid valve is located at the water inlet to control the water intake. The control system acquires the water temperature electrical signal and controls the opening and closing of the solenoid valve. The control system is a W1411 digital thermostat, which includes three sets of displays (2+3+2), five buttons (stop heating + stop cooling + on / off setting + start heating + start cooling), and five wires (2 power cords + probe cord + 2 output cords).
[0039] The control box, the external connector of the drain pipe, and the smoke exhaust outlet are located adjacent to each other for easy unified management.
[0040] The furnace chamber has a central hole 7-1 at the bottom, and gas stove mounting holes 7-2 are distributed around the central hole.
[0041] The usage method of this technical solution is as follows:
[0042] First, place the stove in a suitable position and fill the water storage tank inside the stove through the water inlet 7-3. At the same time, connect the exhaust outlet to the external flue and connect the outer end of the drain pipe to an external hot water collection container (such as an insulated water tank).
[0043] Then, fix the gas stove to the bottom of the burner through the mounting holes, place the pot at the burner opening, and you can start cooking.
[0044] The principle behind this technical solution is:
[0045] When the gas stove inside the furnace is turned on, the flame heats the top pot and the surrounding water storage tank simultaneously. The high-temperature gases produced during combustion (waste heat and smoke) also heat the water in the storage tank as they pass through the exhaust pipe. Because hot water has a lower density than cold water, the hot water rises to the top and is discharged through the top drain (into the drain pipe). This process achieves waste heat recovery and utilization, resulting in environmental protection and energy conservation. At the same time, this device confines the high-temperature flame and gases within a designated space, preventing flame overflow and potential safety hazards.
[0046] Further explanation of the technical effects of this technical solution:
[0047] The stove body is shaped like a platform, with the water storage tank narrowing from the bottom to the top. This structure allows for better collection of hot water because hot water is less dense than cold water, causing it to rise to the top. The narrower top and wider bottom design also facilitates the collection of hot water at the top.
[0048] The interface between the upper and lower shells is covered with a surface and has multiple water passage holes spaced apart. The purpose is to allow the hot water in the lower shell to disperse and evenly enter the upper shell, avoiding turbulent water flow.
[0049] The water inlet and outlet of the water storage tank are located diagonally opposite the stove. Firstly, cold water enters from the bottom and hot water exits from the top, which conforms to the density law of hot and cold water and ensures orderly replacement without chaos. Secondly, the outlet and inlet are far apart from each other, that is, at a relative position of 0° and 180° in a circle. The cold water has to travel the longest distance from left to right and from bottom to top to flow from the inlet to the outlet, so that it can be fully heated.
[0050] In this embodiment, the stove body is composed of three layers: an upper shell, a middle shell, and a lower shell, forming a high-temperature zone, a medium-temperature zone, and a low-temperature zone from top to bottom. The advantage of this stepped structure is that it is horizontally and vertically straight, facilitating precise calculations by ordinary technicians and allowing for easy cutting, welding, and assembly using general-purpose equipment. This facilitates processing and promotes widespread adoption in a low-barrier, low-cost manner. For medium and large-sized enterprises with advanced equipment, the stove body can be designed as a slope (as in Embodiment 2) and formed by one-time stamping to achieve lower production costs, larger water storage space, and a more aesthetically pleasing appearance. Regardless of whether the stove body cross-section is stepped, sloped, or has other irregular shapes, they are essentially equivalent; similarly, regardless of whether the overall stove platform (viewed from above) is circular, square, hexagonal, or octagonal, they are also essentially equivalent.
[0051] The flue pipe is circular, with its flue inlet and outlet adjacent and separated by a baffle. The purpose is to allow the smoke in the furnace to enter the flue pipe through the flue hole 4-1, circulate once, and then be discharged, thus increasing the travel distance and improving heat exchange efficiency. This allows water to fully absorb heat and high-temperature gas to fully release heat.
[0052] Because the upper shell is in direct contact with the outer flame of the fire and the high-temperature pot body, coupled with the rising effect of hot water, the temperature of the upper shell and the water inside is extremely high. Therefore, placing the drain pipe inside the water storage tank can effectively prevent workers from being scalded by hot water pipes. The bottom end of the drain pipe extends out of the lower side wall of the stove body with an external connector. This is to keep the water outlet connector away from the upper shell, which not only prevents workers from being scalded during operation, but also prevents the connector and external water pipe from aging and deforming faster due to proximity to the high-temperature fire source.
[0053] In this embodiment, the control system is a W1411 digital thermostat. This controller includes three sets of displays ("2+3+2"), five buttons ("Stop Heating," "Stop Cooling," "On / Off Setting," "Start Heating," and "Start Cooling"), and five wiring connections ("2 power lines," "2 probe lines," and "2 output lines"). The power lines are connected to the power source, the temperature sensor at the end of the probe line is placed at the drain outlet, and the output lines are connected to the solenoid valve at the inlet. The start temperature is set using the "Start Heating" and "Start Cooling" buttons, and the stop temperature is set using the "Stop Heating" and "Stop Cooling" buttons. For example, if the start temperature is set to 63°C and the stop temperature is set to 60°C, when the water in the drain pipe reaches the start temperature of 63°C, the temperature sensor sends a signal to the controller, and the W1411 digital thermostat sends a signal to open the solenoid valve, allowing cold water to enter while hot water is forced out. When the water in the drain pipe drops to the stop temperature of 60°C, the temperature sensor sends a signal to the controller, and the W1411 digital thermostat sends a signal to close the solenoid valve, allowing water in the storage tank to enter and be heated. In this way, staff can simply focus on cooking and there will be a continuous supply of hot water.
[0054] In summary, this technical solution achieves the following technical effects:
[0055] Because the stove body has a water storage tank (double layer) that isolates the human body from the flames, burns to workers are prevented. At the same time, it fully utilizes the residual heat from the furnace wall and exhaust pipe to heat the water twice, resulting in high heating efficiency. Workers can continuously collect hot water while cooking, eliminating the need for additional water heating equipment, saving kitchen space. The collected hot water has a wide range of uses, including washing pots and pans, washing vegetables, washing hands, and replenishing hot water in pots, achieving energy-saving and environmentally friendly technological effects.
[0056] The hot and cold water in the water storage tank inside the stove is layered and orderly, ensuring a continuous and stable supply of hot water throughout the entire system. Furthermore, the automatic control system ensures that water is naturally discharged and collected once it reaches the designated temperature, eliminating the need for manual supervision and making it more convenient to use.
[0057] Compared to existing technologies, this device is smaller and has a lower production cost, making it very suitable for widespread adoption, especially for low-cost catering entrepreneurs.
[0058] This device has excellent compatibility and can be installed on most gas stoves on the market. The center hole at the bottom of the burner can also supplement air for gas stove combustion, ensuring stable combustion.
[0059] Based on the applicant's preliminary practice, a relatively ideal implementation plan was obtained: the overall diameter of the equipment is 50cm, the diameter of the central hole is 14cm, the upper shell ring is 2cm wide and 6cm high, the middle shell ring is 3cm wide and 4.8cm high, the lower shell ring is 3cm wide and 7.6cm high, the inlet and outlet pipes are 2cm in diameter, the water passage hole is 1.2cm in diameter, and the exhaust pipe is a square tube with a cross-sectional width of 9.5cm and a height of 4.5cm.
[0060] Example 2, see appendix Figure 6 The waste heat recovery stove includes a stove body with an inverted cone-shaped furnace in the middle. The stove body is characterized by having a water storage tank surrounding the furnace. The water inlet of the water storage tank is located below the stove body, and the water outlet of the water storage tank is located above the stove body and leads to the outer wall of the stove body. The exhaust pipe is arranged in a ring around the furnace and suspended in the water storage tank. The exhaust inlet of the exhaust pipe is opened on the furnace wall, and the exhaust outlet of the exhaust pipe leads to the outer wall of the stove body.
[0061] The stove body is shaped like a platform, and the width of the water storage tank gradually narrows from the bottom to the top, meaning the space decreases from large to small.
[0062] The stove body is designed in a frustum shape.
[0063] The exhaust pipe is circular, with its exhaust inlet and exhaust outlet adjacent to each other and separated by a partition.
[0064] The water storage tank is equipped with a drain pipe. The top of the drain pipe is located at the top of the water storage tank, i.e., the water outlet of the water storage tank. The bottom of the drain pipe extends through the lower side wall of the stove body and leaves a connector on the outside.
[0065] The water outlet and inlet of the water storage tank are located diagonally opposite the stove.
[0066] The outer wall of the stove is equipped with a control box, which includes a temperature sensor, a control system, and a solenoid valve. The temperature sensor is located at the water outlet to detect the water temperature, and the solenoid valve is located at the water inlet to control the water intake. The control system acquires the water temperature electrical signal and controls the opening and closing of the solenoid valve.
[0067] The control box, the external connector of the drain pipe, and the smoke exhaust outlet are located adjacent to each other for easy unified management.
[0068] The furnace chamber has a central hole at the bottom, and gas stove mounting holes are distributed around the central hole.
Claims
1. A waste heat recovery stove, including a stove body, wherein the central part of the stove body is an inverted cone-shaped furnace, characterized in that, The stove body is equipped with a water storage tank surrounding the furnace. The water inlet (7-3) of the water storage tank is located below the stove body, and the water outlet of the water storage tank is located above the stove body and leads to the outer wall of the stove body. The exhaust pipe (5) is arranged in a ring around the furnace and suspended in the water storage tank. The exhaust inlet (5-1) of the exhaust pipe is opened on the furnace wall (4), and the exhaust outlet (5-2) of the exhaust pipe leads to the outer wall of the stove body.
2. The waste heat recovery stove according to claim 1, characterized in that, The stove body is shaped like a platform, and the width of the water storage tank gradually narrows from the bottom to the top.
3. The waste heat recovery stove according to claim 1, characterized in that, The stove body is configured to consist of an annular upper shell (1) and a lower shell (7), with the lower shell having a wider annular ring than the upper shell.
4. The waste heat recovery stove according to claim 3, characterized in that, The upper shell and the lower shell are connected by a cover and are spaced apart by a plurality of water passage holes (3).
5. The waste heat recovery stove according to claim 1, characterized in that, The exhaust pipe is circular, with its exhaust inlet and exhaust outlet adjacent to each other and separated by a partition.
6. The waste heat recovery stove according to claim 1, characterized in that, The water storage tank is equipped with a drain pipe (6), with the top of the drain pipe located at the top of the water storage tank and the bottom of the drain pipe extending through the lower side wall of the stove body with an external connector.
7. The waste heat recovery stove according to claim 1, characterized in that, The water outlet and inlet of the water storage tank are located diagonally opposite the stove.
8. The waste heat recovery stove according to claim 1, characterized in that, The outer wall of the stove is equipped with a control box (8). The control box includes a temperature sensor (8-1), a control system, and a solenoid valve. The temperature sensor is set at the water outlet to detect the water temperature. The solenoid valve is set at the water inlet to control the water inlet. The control system obtains the water temperature electrical signal and controls the opening and closing of the solenoid valve.
9. The waste heat recovery stove according to claim 8, characterized in that, The control system is a W1411 digital temperature controller.
10. The waste heat recovery stove according to claim 1, characterized in that, The furnace chamber has a central hole (7-1) at the bottom, and gas stove mounting holes (7-2) are distributed around the central hole.