Multi-stage thermal cycle energy-saving baking oven

Abstract

The present application relates to the technical field of baking oven, especially to a multi-stage heat cycle energy-saving baking oven, comprising a baking oven body, a heat collecting curved pipe and an adjustable waste heat cycle assembly, the inside of the baking oven body is provided with an electric heating pipe, the inner wall of the baking oven body is provided with auxiliary electric heating wires on both sides, the side end surface of the baking oven body is hinged with a closing door, the inside of the side end of the baking oven body is provided with a hot air flow channel, the inside of the top end of the baking oven body is provided with a hot air drainage assembly, and the inside of the side end of the baking oven body is provided with an adjustable waste heat cycle assembly. The heat collecting cycle structure composed of the heat collecting curved pipe, the graphene heat conducting block and the heat collecting copper sheet is used to collect the waste heat in the baking process and recycle the water through the first heat releasing pipe and the second heat releasing pipe, so as to reduce the heat loss of the baking oven body as a whole.

Description

Technical Field

[0001] This invention relates to the field of baking oven technology, and more particularly to a multi-stage heat circulation energy-saving baking oven. Background Technology

[0002] A baking oven is a device used for baking food. It is generally made of metal, such as cold-rolled steel or stainless steel. It can make various types of bread, such as staple bread, sweet bread, and savory bread. By controlling the baking temperature and time, the bread develops a golden-brown crust on the surface and a soft and fluffy interior. It can also be used to bake egg tarts, pizzas, roast chicken, roast duck, and other foods. It can even be used to dry some dried goods, such as dried fruit slices and Chinese medicinal herbs.

[0003] Most existing baking ovens consist of an insulated heating chamber with an internal quartz heating element that heats the air inside. This heated air exchanges heat with the food to bake it. While this meets the baking needs of most households and businesses, it has some drawbacks in practical use. Although the temperature of the air inside the oven drops after heat exchange with the food, it still contains a significant amount of heat. This residual heat dissipates into the surrounding environment through gaps in the chamber or vents, wasting energy. Furthermore, to reach the set baking temperature, the heating element needs to be frequently activated and operate for extended periods. This not only increases energy consumption but also causes uneven heat distribution, affecting the consistency of food baking. In winter, when the ambient temperature is low, heat dissipation is faster, requiring more energy to maintain the set temperature. In summer, when the ambient temperature is high, poor heat dissipation can lead to excessively high internal temperatures, making it difficult to accurately control the baking temperature.

[0004] Therefore, in order to solve the problem that the large amount of residual heat contained in the hot air inside the baking oven after heat exchange with the food cannot be reused, resulting in energy waste, and that the heating elements need to be frequently started to maintain the set temperature, which greatly increases energy consumption, and also leads to uneven heat distribution inside the oven, seriously affecting the consistency of food baking, a multi-stage heat circulation energy-saving baking oven was proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-stage heat circulation energy-saving baking oven, which solves the problem that the large amount of residual heat contained in the hot air inside the baking oven after heat exchange with the food cannot be reused, resulting in energy waste. At the same time, in order to maintain the set temperature, the heating element needs to be started frequently, which greatly increases energy consumption and also leads to uneven heat distribution inside the oven, seriously affecting the consistency of food baking.

[0006] The technical solution of this invention is as follows: a multi-stage heat circulation energy-saving baking oven, comprising a baking oven body, a heat-collecting curved tube, and an adjustable waste heat circulation component. An electric heating tube is installed inside the baking oven body, and auxiliary electric heating wires are installed on both sides of the inner wall of the baking oven body. A closed door is hinged to the side end face of the baking oven body. A hot air flow channel is opened inside the side end of the baking oven body. A hot air guiding component is installed inside the top of the baking oven body. An adjustable waste heat circulation component is installed inside the side end of the baking oven body. A protective mesh plate is fixed to the top of the inner wall of the baking oven body by bolts. A heat-collecting cavity is opened inside the top of the baking oven body. A heat-conducting perforated plate is installed on the inner wall of the bottom end of the heat-collecting cavity. The heat-conducting perforated plate is positioned directly above the protective mesh plate. A graphene heat-conducting block is installed at the upper end of the heat-conducting perforated plate, and a heat-collecting curved tube is installed at the upper end of the graphene heat-conducting block.

[0007] Preferably, the heat-collecting curved tube is fitted with a heat-collecting copper sheet that conducts heat. A heat-insulating cavity is opened inside the back end of the baking oven body. The return water pipe of the heat-collecting curved tube is connected to the inlet of a reflux pump. The outlet pipe of the reflux pump is connected to a first heat-releasing pipe. A back heat insulation plate is fixed to the back end of the baking oven body by bolts. A water storage tank is installed on the outside of the back heat insulation plate. The end pipe of the first heat-releasing pipe is connected to the inside of the water storage tank. A booster pump is installed at the bottom of the water storage tank. The inlet pipe of the booster pump extends into the inside of the water storage tank. The outlet pipe of the booster pump is connected to a second heat-releasing pipe. The second heat-releasing pipe, the reflux pump, and the first heat-releasing pipe are all located inside the heat-insulating cavity. The end pipe of the second heat-releasing pipe is connected to the inlet of the heat-collecting curved tube. A water inlet and a steam pressure relief valve are provided at the upper end of the water storage tank.

[0008] Preferably, the inner wall of the baking oven body is fixedly connected to a sliding tray, and a hollow heat-conducting baking tray is slidably connected inside the sliding tray. A blower fan is installed inside the baking oven body, and the blower fan is located below the electric heating tube. The blower fan's airflow direction is from bottom to top. A lower hot air return port is opened on the inner wall of the baking oven body, and an exhaust fan is installed inside the lower hot air return port. The exhaust fan's airflow direction is from left to right. A receiving groove is opened inside the bottom of the baking oven body, and an oil collection tray is slidably connected inside the receiving groove.

[0009] Preferably, the hot air diversion assembly includes an air inlet, a diversion fan, a fixed frame plate, a dust filter, an upper hot air return port, a top heat insulation cover, a heat dissipation frame, a conical air outlet guide frame plate, a rotary motor, an adjusting roller, a ventilation slot, and a heat dissipation fan. The baking oven body has an air inlet on its side end face, and a diversion fan is installed inside the air inlet. The airflow direction of the diversion fan is from right to left. A fixed frame plate is installed on the side end face of the baking oven body. The fixed frame plate is located outside the diversion fan, and a dust filter is installed on the inner side of the fixed frame plate.

[0010] Preferably, the inner wall of the heat collection cavity is provided with an upper hot air return port, the heat collection cavity and the upper hot air return port are interconnected, the upper hot air return port is connected to the hot air flow channel, the top of the baking oven body is fixed with a top heat insulation cover by bolts, the upper end of the top heat insulation cover is installed with a heat dissipation frame, the inside of the heat dissipation frame is provided with a conical air outlet guide plate, and the heat dissipation frame and the conical air outlet guide plate are positioned above the hot air flow channel.

[0011] Preferably, a rotary motor is installed at the side end of the heat dissipation frame, and the output shaft of the rotary motor passes through the heat dissipation frame and is connected to the central shaft of the adjusting roller shaft. The adjusting roller shaft has a ventilation slot inside, and a cooling fan is provided above the heat dissipation frame, with the airflow direction of the cooling fan from bottom to top.

[0012] Preferably, the adjustable waste heat circulation assembly includes a side heat insulation plate, an elastic closed adjustment plate, a receiving groove, a tension spring, a first mounting groove, a limiting ring, a fixed pulley support rod, a limiting pulley support rod, a second mounting groove, a winding roller shaft, a traction rope, a hook, a U-shaped block, and a micro motor. The side end of the baking oven body is fixed with a side heat insulation plate by bolts, and a micro motor is installed on the outer end of the side heat insulation plate.

[0013] Preferably, the inner wall of the hot airflow channel is hinged with an elastic sealing adjustment plate, and a receiving groove is provided at the side end of the inner wall of the hot airflow channel, with a tension spring hinged inside the receiving groove.

[0014] Preferably, the side end of the tension spring is hinged to the outer end of the elastic closed adjustment plate, and a first mounting groove is provided on the side end of the baking oven body. A limit ring is fixedly connected to the inner wall of the first mounting groove, and a fixed pulley support rod is installed on the inner wall of the first mounting groove. A limit pulley support rod is installed on the inner wall of the first mounting groove, and the fixed pulley support rod and the limit pulley support rod are arranged symmetrically on the top and bottom.

[0015] Preferably, a second mounting groove is provided on the side end of the baking oven body, and a winding roller shaft is rotatably connected inside the second mounting groove. The output shaft of the micro motor passes through the side heat insulation plate and is fixed to the central shaft of the winding roller shaft. A traction rope is provided on the outside of the winding roller shaft. One end of the traction rope is fixed to the outside of the winding roller shaft, and the other end of the traction rope is connected to a hook through a limiting ring and a fixed pulley support rod. A U-shaped block is provided on the inner side of the elastic closed adjustment plate, and the hook is hinged to the inner side of the U-shaped block.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The heat collection circulation structure, composed of heat-collecting curved tubes, graphene heat-conducting blocks, and heat-collecting copper sheets, utilizes the high specific heat capacity of water to collect the residual heat during the baking process and circulate it through the first and second heat-dissipating pipes. The heat is then circulated through the heat-insulating cavity on the back of the baking oven body by the first and second heat-dissipating pipes, which reduces the overall heat loss of the baking oven body, improves energy utilization, and shortens the baking time.

[0017] 2. Heating can be achieved through the coordinated use of electric heating tubes and auxiliary electric heating wires, along with a blower fan to promote the circulation of hot air from bottom to top, resulting in a uniform temperature distribution inside the baking oven. The heat dissipation assembly, including the air dissipation fan, rotary motor, adjusting roller, and cooling fan, can precisely regulate the temperature and airflow inside the oven. When the temperature inside the oven is too high, the adjusting roller rotates, aligning its internal ventilation slots with the opening above the hot airflow channel. The cooling fan then removes the heat from inside the baking oven. Once the temperature drops, the adjusting roller rotates again, displacing the ventilation slots from the hot airflow channel, effectively sealing the opening at the top of the hot airflow channel and reducing heat loss.

[0018] 3. By using a micro motor to drive the winding roller shaft, the traction rope is extended and retracted, and the angle of the elastic sealing adjustment plate is flexibly adjusted to achieve precise control of the hot air flow and circulation path. After baking, the entire hot airflow channel can be completely closed to end the heat circulation. Then, the cooling fan in the heat dissipation frame and the air intake fan form an airflow path to accelerate the dissipation of heat in the baking oven body. The heat dissipation and airflow can be flexibly adjusted. When the elastic sealing adjustment plate is opened, the hot air can pass through the hot airflow channel and finally be discharged from the lower hot air return port. Then, the exhaust fan pushes the recovered hot air upward and is heated again by the electric heating tube before being discharged into the items in the oven.

[0019] 4. The sliding tray inside the baking oven body is connected to the hollow heat-conducting baking tray, making it convenient for users to place and remove baking items. The dust filter inside the fixed frame can effectively filter the outside air, prevent dust from entering the oven, ensure a clean baking environment, and improve food hygiene and safety. The design of the heat insulation cavity, back heat insulation plate, top heat insulation cover, and side heat insulation plates reduces heat loss to the outside, which not only improves the heat preservation performance but also avoids accidental burns to the operator, thus improving the safety of use. Attached Figure Description

[0020] Figure 1 The diagram shown is a schematic representation of the overall three-dimensional structure of the present invention; Figure 2 The diagram shown is a three-dimensional structural schematic of the hollow heat-conducting baking tray of the present invention. Figure 3 The diagram shown is a three-dimensional structural schematic of the blower fan of the present invention; Figure 4 The diagram shown is a three-dimensional structural schematic of the oil collecting plate of the present invention; Figure 5 The diagram shown is a three-dimensional structural schematic of the protective mesh panel of the present invention. Figure 6 The diagram shown is a three-dimensional structural schematic of the heat-conducting perforated plate of the present invention. Figure 7 The diagram shown is a three-dimensional structural schematic of the first heat-dissipating tube of the present invention. Figure 8 The diagram shown is a three-dimensional structural schematic of the booster pump of the present invention; Figure 9 The diagram shown is a three-dimensional structural schematic of the hot airflow channel of the present invention. Figure 10 The diagram shown is a three-dimensional structural schematic of the adjusting roller shaft of the present invention; Figure 11 The diagram shown is a three-dimensional structural schematic of the elastic closed adjustment plate of the present invention. Figure 12 The diagram shown is a three-dimensional structural schematic of the tension spring of the present invention; Figure 13 This invention is shown. Figure 12 Enlarged 3D structural diagram at point A.

[0021] Explanation of reference numerals in the attached diagram: 1. Baking oven body; 2. Electric heating element; 3. Auxiliary electric heating wire; 4. Sealing door; 5. Slide tray; 6. Hollowed-out heat-conducting baking tray; 7. Blower fan; 8. Lower hot air return port; 9. Exhaust fan; 10. Receiving channel; 11. Oil collection tray; 101. Protective mesh plate; 102. Heat collection cavity; 103. Heat-conducting perforated plate; 104. Graphene heat-conducting block; 105. Heat-collecting curved tube; 106. Heat-collecting copper sheet; 107. Return pump; 108. First heat release tube; 109. Back heat insulation plate; 110. Water storage tank; 111. Booster pump; 112. Second heat release tube; 113. Water inlet; 114. Steam pressure relief valve; 201. Air inlet; 202. Drainage fan; 203. Fixed frame plate; 204. Dustproof net; 205. Upper hot air return port; 206. Hot air flow channel; 207. Top heat insulation cover; 208. Heat dissipation frame cylinder; 209. Conical air outlet guide frame plate; 210. Rotary motor; 211. Adjusting roller shaft; 212. Ventilation slot; 213. Cooling fan; 301. Side heat insulation plate; 302. Elastic sealing adjustment plate; 303. Receiving groove; 304. Tension spring; 305. First mounting groove; 306. Limiting ring; 307. Fixed pulley support rod; 308. Limiting pulley support rod; 309. Second mounting groove; 310. Winding roller shaft; 311. Traction rope; 312. Hook; 313. U-shaped block; 314. Miniature motor. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1-13This invention provides an embodiment of a multi-stage heat circulation energy-saving baking oven, comprising a baking oven body 1, a heat-collecting curved tube 105, and an adjustable waste heat circulation assembly. An electric heating tube 2 is installed inside the baking oven body 1, auxiliary electric heating wires 3 are installed on both sides of the inner wall of the baking oven body 1, a closed door 4 is hinged to the side end face of the baking oven body 1, a hot air flow channel 206 is opened inside the side end of the baking oven body 1, a hot air guiding assembly is installed inside the top of the baking oven body 1, and an adjustable waste heat circulation assembly is installed inside the side end of the baking oven body 1. A protective mesh plate 101 is fixed to the top of the inner wall of the oven body 1 by bolts. A heat collection cavity 102 is opened inside the top of the oven body 1. A heat conduction plate 103 is provided on the inner wall of the bottom end of the heat collection cavity 102. The heat conduction plate 103 is located directly above the protective mesh plate 101. A graphene heat conduction block 104 is installed at the upper end of the heat conduction plate 103. A heat collection curved tube 105 is installed at the upper end of the graphene heat conduction block 104. The heat inside the oven body 1 is transferred to the heat collection curved tube 105 through the protective mesh plate 101, the heat conduction plate 103 and the graphene heat conduction block 104.

[0024] A heat-collecting curved tube 105 is externally fitted with a heat-collecting copper sheet 106 that conducts heat. A heat-insulating cavity is formed inside the back end of the baking oven body 1. The return water pipe of the heat-collecting curved tube 105 is connected to the inlet of a return pump 107. The outlet pipe of the return pump 107 is connected to a first heat-dissipating pipe 108. A back heat insulation plate 109 is bolted to the outside of the back end of the baking oven body 1. A water storage tank 110 is installed on the outside of the back heat insulation plate 109. The end pipe of the first heat-dissipating pipe 108 is connected to the inside of the water storage tank 110. A booster pump 111 is installed at the bottom of the water storage tank 110. The inlet pipe of the booster pump 111 extends into the inside of the water storage tank 110. The outlet pipe is connected to a second heat-dissipating pipe 112. The second heat-dissipating pipe 112, the return pump 107, and the first heat-dissipating pipe 108 are all located inside the heat-insulating cavity. The end pipe of the second heat-dissipating pipe 112 is connected to the inlet of the heat-collecting curved pipe 105. The upper end of the water storage tank 110 is equipped with a water inlet 113 and a steam pressure relief valve 114. The heat-collecting copper sheet 106 on the outside of the heat-collecting curved pipe 105 enhances the heat collection effect. The return pump 107 extracts the hot water in the heat-collecting curved pipe 105 and transports it to the water storage tank 110 through the first heat-dissipating pipe 108. The booster pump 111 then sends the water in the water storage tank 110 back to the heat-collecting curved pipe 105 through the second heat-dissipating pipe 112, forming a hot water circulation.

[0025] The inner wall of the baking oven body 1 is fixedly connected to a sliding tray 5, and a hollow heat-conducting baking tray 6 is slidably connected inside the sliding tray 5. A blower fan 7 is installed inside the baking oven body 1, which is located below the electric heating tube 2. The blower fan 7 blows air from bottom to top. A lower hot air return port 8 is opened on the inner wall of the baking oven body 1. An exhaust fan 9 is installed inside the lower hot air return port 8. The exhaust fan 9 blows air from left to right. A receiving groove 10 is opened inside the bottom of the baking oven body 1. An oil collection tray 11 is slidably connected inside the receiving groove 10. The blower fan 7 makes hot air flow from bottom to top in the oven, so that the heat is evenly distributed in the oven to bake the items on the hollow heat-conducting baking tray 6.

[0026] The hot air intake assembly includes an air inlet 201, an intake fan 202, a fixed frame plate 203, a dust filter 204, an upper hot air return port 205, a top heat insulation cover 207, a heat dissipation frame cylinder 208, a conical air outlet guide frame plate 209, a rotary motor 210, an adjusting roller 211, a ventilation slot 212, and a heat dissipation fan 213. An air inlet 201 is provided on the side end face of the baking oven body 1. An intake fan 202 is installed inside the air inlet 201. The airflow direction of the intake fan 202 is from right to left. A fixed frame plate 203 is installed on the side end face of the baking oven body 1. The fixed frame plate 203 is located outside the intake fan 202. A dust filter 204 is provided on the inner side of the fixed frame plate 203. The fixed frame plate 203 is installed outside the air inlet 201. The dust filter 204 on its inner side can filter the external air and prevent dust and other impurities from entering the oven, ensuring a clean baking environment.

[0027] The inner wall of the heat collection cavity 102 is provided with an upper hot air return port 205. The heat collection cavity 102 and the upper hot air return port 205 are interconnected. The upper hot air return port 205 is connected to the hot air flow channel 206. The top of the baking oven body 1 is fixed with a top heat insulation cover 207 by bolts. A heat dissipation frame cylinder 208 is installed at the upper end of the top heat insulation cover 207. A conical air outlet guide plate 209 is provided inside the heat dissipation frame cylinder 208. The heat dissipation frame cylinder 208 and the conical air outlet guide plate 209 are located above the hot air flow channel 206. The heat collection cavity 102 is connected to the hot air flow channel 206 through the upper hot air return port 205, so that the hot air in the heat collection cavity 102 is introduced into the hot air flow channel 206. The top heat insulation cover 207 is installed on the top of the baking oven body 1 to insulate and protect the heat collection cavity 102 and reduce heat loss.

[0028] A rotary motor 210 is installed at the side end of the heat dissipation frame 208. The output shaft of the rotary motor 210 passes through the heat dissipation frame 208 and is connected to the central shaft of the adjusting roller shaft 211. The adjusting roller shaft 211 has a ventilation slot 212 inside. A cooling fan 213 is installed above the heat dissipation frame 208. The airflow direction of the cooling fan 213 is from bottom to top. After the adjusting roller shaft 211 rotates, the flow of hot air in the box is changed or closed by whether the ventilation slot 212 inside is vertically aligned with the opening above the hot airflow channel 206. The cooling fan 213 is installed above the heat dissipation frame 208, with the airflow direction from bottom to top, to assist in the exhaust of hot air.

[0029] The adjustable waste heat circulation assembly includes a side heat insulation plate 301, an elastic closed adjustment plate 302, a receiving groove 303, a tension spring 304, a first mounting groove 305, a limiting ring 306, a fixed pulley support rod 307, a limiting pulley support rod 308, a second mounting groove 309, a winding roller shaft 310, a traction rope 311, a hook 312, a U-shaped block 313, and a micro motor 314. The side end of the baking oven body 1 is fixed with a side heat insulation plate 301 by bolts. The micro motor 314 is installed on the outer end of the side heat insulation plate 301. The side heat insulation plate 301 can block the heat dissipation from the side end of the baking oven body 1.

[0030] The inner wall of the hot airflow channel 206 is hinged with an elastic sealing adjustment plate 302. A receiving groove 303 is provided on the side of the inner wall of the hot airflow channel 206. A tension spring 304 is hinged inside the receiving groove 303. The tension spring 304 can be reset after the elastic sealing adjustment plate 302 is pulled out to maintain the passage of the hot airflow channel 206.

[0031] The side end of the tension spring 304 is hinged to the outer end of the elastic closed adjustment plate 302. The side end of the baking oven body 1 is provided with a first mounting groove 305. The inner wall of the first mounting groove 305 is fixed with a limit ring 306. The inner wall of the first mounting groove 305 is equipped with a fixed pulley support rod 307 and a limit pulley support rod 308. The fixed pulley support rod 307 and the limit pulley support rod 308 are symmetrically arranged. The limit ring 306, the fixed pulley support rod 307 and the limit pulley support rod 308 can make the movement trajectory of the traction rope 311 more stable.

[0032] A second mounting groove 309 is provided on the side end of the baking oven body 1. A winding roller shaft 310 is rotatably connected inside the second mounting groove 309. The output shaft of the micro motor 314 passes through the side heat insulation plate 301 and is fixed to the central shaft of the winding roller shaft 310. A traction rope 311 is provided on the outside of the winding roller shaft 310. One end of the traction rope 311 is fixed to the outside of the winding roller shaft 310, and the other end of the traction rope 311 is connected to a hook 312 through a limiting ring 306 and a fixed pulley support rod 307, which provides elastic closure. A U-shaped block 313 is provided on the inner side of the adjusting plate 302. The hook 312 is hinged to the inner side of the U-shaped block 313. When the winding roller 310 winds up the traction rope 311, it pulls the elastic sealing adjusting plate 302 to rotate around the hinge point, at which time the hot air flow channel 206 is closed. When the winding roller 310 releases the traction rope 311, the tension spring 304 is hinged between the receiving groove 303 and the elastic sealing adjusting plate 302. It pulls the elastic sealing adjusting plate 302 back by its own elasticity, at which time the hot air flow channel 206 is opened.

[0033] Working principle: According to Figures 1-4 First, start the baking oven body 1 to make the internal electric heating tube 2 start working and generate heat as the main heat source. The auxiliary electric heating wires 3 are distributed on both sides of the inner wall of the baking oven body 1 to help raise the temperature inside the oven. The two work together to quickly raise the temperature inside the oven. The blower fan 7 is located below the electric heating tube 2. After it is turned on, it blows the heat generated by the electric heating tube 2 from bottom to top, causing the hot air to flow inside the baking oven. This allows the heat to be evenly transferred to the items to be baked on the hollow heat-conducting baking tray 6, ensuring even baking. The hollow heat-conducting baking tray 6 can slide in the sliding tray 5, making it easy to place and remove the items to be baked.

[0034] according to Figures 5-8 The heat inside the baking oven body 1 is conducted through the protective mesh plate 101 and the heat-conducting perforated plate 103 to the graphene heat-conducting block 104. The graphene heat-conducting block 104, with its excellent thermal conductivity, quickly transfers the heat to the heat-collecting curved tube 105. The heat-collecting copper sheet 106 sleeved on the outside of the heat-collecting curved tube 105 further enhances the heat collection effect and absorbs the residual heat inside the oven. The return pump 107 extracts the heated water from the heat-collecting curved tube 105 and delivers it to the water storage tank 110 through the first heat release pipe 108. The booster pump 111 pressurizes the water in the water storage tank 110 and sends it back to the water inlet of the heat-collecting curved tube 105 through the second heat release pipe 112. This forms a complete hot water circulation structure, which can maintain the temperature of the back end of the baking oven body 1 and realize the recovery and utilization of the residual heat inside the oven. The water inlet 113 at the top of the water storage tank 110 is used to replenish the water volume, and the steam pressure relief valve 114 prevents excessive pressure from causing safety problems.

[0035] according to Figure 5 and Figures 9-10A draft fan 202 is installed inside the air inlet 201, with the airflow direction from right to left. Upon startup, it draws outside air into the oven body 1, mixing it with the hot air inside and regulating the air composition and temperature. A fixed frame plate 203 is installed outside the air inlet 201, and its inner dust filter 204 filters outside air, preventing dust and other impurities from entering the oven and ensuring a clean baking environment. The heat-collecting cavity 102 at the top of the inner wall of the oven body 1 is connected to the hot airflow channel 206 through the upper hot air return port 205, allowing the air to flow from outside into the oven. Hot air in the heat collection cavity 102 is introduced into the hot airflow channel 206 by the exhaust fan 9. When the temperature inside the oven is too high, the adjusting roller 211 is rotated so that the ventilation slot 212 inside it is perpendicular to the opening at the top of the hot airflow channel 206. The cooling fan 213 removes the heat inside the oven body 1. After the heat drops, the adjusting roller 211 is rotated so that the ventilation slot 212 is misaligned with the hot airflow channel 206, which seals the opening at the top of the hot airflow channel 206 and reduces heat loss.

[0036] according to Figures 11-13 The micro motor 314 drives the winding roller 310 to extend and retract the traction rope 311, flexibly adjusting the angle of the elastic sealing adjustment plate 302 to achieve precise control of the hot air flow and circulation path. After baking, the entire hot airflow channel 206 can be completely closed to end the heat circulation. Then, the cooling fan 213 in the heat dissipation frame 208 and the air intake fan 202 in the air inlet 201 form an airflow path to accelerate the dissipation of heat in the baking oven body 1. The heat dissipation and airflow can be flexibly adjusted. The tension spring 304 is hinged between the receiving groove 303 and the elastic sealing adjustment plate 302. It pulls the elastic sealing adjustment plate 302 back by its own elasticity. At this time, the hot airflow channel 206 is opened, and the hot air can pass through the hot airflow channel 206 and finally be discharged from the lower hot air return port 8. Then, the exhaust fan 9 pushes the recovered hot air upward and is heated again by the electric heating tube 2 before being discharged into the items in the oven.

[0037] It should be noted that the above-mentioned electric heating tube 2, auxiliary electric heating wire 3, blower fan 7, exhaust fan 9, reflux pump 107, booster pump 111, drainage fan 202, rotary motor 210, cooling fan 213 and micro motor 314 can be powered by existing operating techniques. Whether the power is supplied by the power supply component or by the external wire, it is acceptable. These are all existing conventional operating techniques and will not be described in detail here.

[0038] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage heat circulation energy-saving baking oven, comprising a baking oven body (1); characterized in that: It also includes a heat-collecting curved tube (105) and an adjustable waste heat circulation assembly. An electric heating tube (2) is installed inside the baking oven body (1). Auxiliary electric heating wires (3) are installed on both sides of the inner wall of the baking oven body (1). A closed door (4) is hinged to the side end of the baking oven body (1). A hot airflow channel (206) is opened inside the side end of the baking oven body (1). A hot air guiding assembly is installed inside the top of the baking oven body (1). An adjustable waste heat circulation assembly is installed inside the side end of the baking oven body (1). A protective mesh plate (101) is fixed to the top of the inner wall of the baking oven body (1) by bolts. A heat-collecting cavity (102) is opened inside the top of the baking oven body (1). A heat-conducting perforated plate (103) is provided on the inner wall of the bottom end of the heat-collecting cavity (102). The heat-conducting perforated plate (103) is located directly above the protective mesh plate (101). A graphene heat-conducting block (104) is installed on the upper end of the heat-conducting perforated plate (103). A heat-collecting curved tube (105) is installed on the upper end of the graphene heat-conducting block (104). A heat-collecting copper sheet (106) is fitted and heat-conductingly attached to the outside of the heat-collecting curved tube (105). A heat-insulating cavity is opened inside the back end of the baking oven body (1). The return water pipe of the heat-collecting curved tube (105) is connected to the inlet end of the reflux pump (107). The outlet end pipe of the reflux pump (107) is connected to the first heat-releasing pipe (108). The baking oven body (1) A back heat insulation plate (109) is fixed to the outside of the back end by bolts. A water storage tank (110) is installed on the outside of the back heat insulation plate (109). The end pipe of the first heat release pipe (108) is connected to the inside of the water storage tank (110). A booster pump (111) is installed at the bottom of the water storage tank (110). The inlet pipe of the booster pump (111) extends into the inside of the water storage tank (110). The outlet pipe of the booster pump (111) is connected to a second heat release pipe (112). The second heat release pipe (112), the return pump (107) and the first heat release pipe (108) are all set inside the heat insulation cavity. The end pipe of the second heat release pipe (112) is connected to the inlet of the heat collection curved pipe (105). The upper end of the water storage tank (110) is provided with a water inlet (113) and a steam pressure relief valve (114). The hot air diversion assembly includes an air inlet (201), a diversion fan (202), a fixed frame plate (203), a dust filter (204), an upper hot air return port (205), a top heat insulation cover (207), a heat dissipation frame cylinder (208), a conical air outlet guide frame plate (209), a rotary motor (210), an adjusting roller (211), a ventilation slot (212), and a heat dissipation fan (213). The side end face of the baking oven body (1) is provided with an air inlet (201). The air inlet (201) is provided with a diversion fan (202). The airflow direction of the diversion fan (202) is from right to left.A fixed frame plate (203) is installed on the side end face of the baking oven body (1). The fixed frame plate (203) is located outside the exhaust fan (202). A dust filter (204) is provided on the inner side of the fixed frame plate (203). An upper hot air return port (205) is provided on the inner wall of the heat collection cavity (102). The heat collection cavity (102) and the upper hot air return port (205) are interconnected. The upper hot air return port (205) is connected to the hot air flow channel (206). A top heat insulation cover (207) is fixed to the top of the baking oven body (1) by bolts. A heat dissipation frame cylinder (208) is installed at the upper end of the top heat insulation cover (207). A conical air outlet is provided inside the heat dissipation frame cylinder (208). The guide plate (209), the heat dissipation frame cylinder (208) and the conical air outlet guide plate (209) are arranged above the hot air flow channel (206). A rotary motor (210) is installed on the side end of the heat dissipation frame cylinder (208). The output shaft of the rotary motor (210) passes through the heat dissipation frame cylinder (208) and is connected to the central shaft of the adjusting roller shaft (211). The adjusting roller shaft (211) has a ventilation slot (212) inside. A cooling fan (213) is arranged above the heat dissipation frame cylinder (208). The airflow direction of the cooling fan (213) is from bottom to top. The adjustable waste heat circulation assembly includes a side heat insulation plate (301), an elastic closed adjusting plate (302), a receiving groove (303), and a tension spring (304). 04), First mounting groove (305), limiting ring (306), fixed pulley support rod (307), limiting pulley support rod (308), second mounting groove (309), winding roller shaft (310), traction rope (311), hook (312), U-shaped block (313) and micro motor (314), the side end of the baking oven body (1) is fixed with a side heat insulation plate (301) by bolts, the outer end of the side heat insulation plate (301) is equipped with a micro motor (314), the inner wall of the hot air flow channel (206) is hinged with an elastic sealing adjustment plate (302), the inner wall side end of the hot air flow channel (206) is provided with a receiving groove (303), the inside of the receiving groove (303) is hinged with a tension spring ( 304), the side end of the tension spring (304) is hinged to the outer end of the elastic closed adjustment plate (302), the side end of the baking box body (1) is provided with a first mounting groove (305), the inner wall of the first mounting groove (305) is fixedly connected with a limit ring (306), the inner wall of the first mounting groove (305) is provided with a fixed pulley support rod (307), the inner wall of the first mounting groove (305) is provided with a limit pulley support rod (308), the fixed pulley support rod (307) and the limit pulley support rod (308) are symmetrically arranged up and down, the side end of the baking box body (1) is provided with a second mounting groove (309), the inside of the second mounting groove (309) is rotatably connected with a winding roller shaft (310).The output shaft of the micro motor (314) passes through the side heat insulation plate (301) and is fixed to the central shaft of the winding roller shaft (310). A traction rope (311) is provided on the outside of the winding roller shaft (310). One end of the traction rope (311) is fixed to the outside of the winding roller shaft (310), and the other end of the traction rope (311) is connected to a hook (312) via a limiting ring (306) and a fixed pulley support rod (307). A U-shaped block (313) is provided on the inner side of the elastic closed adjustment plate (302), and the hook (312) is hinged to the inner side of the U-shaped block (313).

2. The multi-stage heat circulation energy-saving baking oven according to claim 1, characterized in that: The inner wall of the baking oven body (1) is fixed with a sliding tray (5), and a hollow heat-conducting baking tray (6) is slidably connected inside the sliding tray (5). A blower fan (7) is installed inside the baking oven body (1), and the blower fan (7) is located below the electric heating tube (2). The airflow direction of the blower fan (7) is from bottom to top. A lower hot air return port (8) is opened on the inner wall of the baking oven body (1). An exhaust fan (9) is installed inside the lower hot air return port (8). The airflow direction of the exhaust fan (9) is from left to right. A receiving groove (10) is opened inside the bottom end of the baking oven body (1). An oil collection tray (11) is slidably connected inside the receiving groove (10).

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