A high energy efficiency coffee roaster with top air inlet and full heat recovery

Abstract

The application discloses a high-energy-efficiency coffee roaster with top air inlet and full heat energy recovery, and particularly relates to the technical field of coffee machines, which comprises a hearth shell and a control system, the control system is fixedly installed on the inner bottom wall of the hearth shell, a feeding port is arranged at the upper right corner of the hearth shell, a feeding door is rotatably connected to the inner wall of the hearth shell and located at the feeding port, a flow guide plate is fixedly installed on the inner wall of the hearth shell, and an inner hearth is arranged on the inner wall of the hearth shell and located below the flow guide plate. The high-energy-efficiency coffee roaster with top air inlet and full heat energy recovery is characterized in that the air inlet and the air blower guide the airflow to pass through the inner pot from top to bottom, the electric heating tube and the flow guide plate make the airflow be fully and uniformly mixed and heated before reaching the inner pot, the high-temperature airflow provides sufficient convection heat source for the coffee roasting process, the coffee bean roasting is more uniform, and the airflow guided by the air blower carries away the flue gas generated in the roasting process.

Description

Technical Field

[0001] This invention relates to the field of coffee machine technology, and in particular to a high-efficiency coffee roaster with top air intake that fully recovers heat energy. Background Technology

[0002] Coffee is a beverage made from roasted and ground coffee beans. It is one of the world's most popular drinks. With the development of the times, traditional handmade coffee making takes a long time. Therefore, some people who are not very particular about the flavor of coffee usually use coffee machines. Coffee machines apply electronic technology to coffee machines, realizing the automatic control of the entire coffee brewing process, including grinding, tamping, filling, brewing, and cleaning up the residue.

[0003] Existing coffee roasters have the heating element located at the bottom of the inner pot, the air inlet at the bottom, and the air outlet at the top. Hot air enters from the bottom heater, is heated, and then enters the inner pot from the rear, where it heats the coffee beans. The air then exits from the top front of the inner pot, carrying away the silver husk and smoke generated during roasting. A silver husk filter is installed at the hot air outlet to remove the silver husk. The disadvantages of this design are that it requires a separate silver husk filter, which is too expensive; the roaster is too large; and the heat energy in the exhaust air is not fully recovered, resulting in low energy efficiency.

[0004] This method does not include a separate air inlet; instead, an exhaust vent is located at the top of the inner pot to expel the smoke generated during roasting. Perforations are made in the inner pot wall, or the inner pot is designed as a cage. These perforations and cage-like designs sift out the silver foil during rotation. A silver foil drawer is located at the bottom of the inner pot to collect the silver foil. The drawback of this method is that it does not utilize high-temperature convective heat transfer as the primary heat source, relying mainly on thermal radiation and contact heat transfer. This is less efficient at heating coffee beans than convective heat transfer, and it does not achieve the same 360-degree omnidirectional heating. Furthermore, it only relies on the natural upward movement of the smoke to expel it, without actively designing an airflow to enhance the purging of the smoke, which can easily result in an unpleasant smoky flavor in the finished product.

[0005] Because coffee beans expand during roasting, a cage-like design for the inner pot can easily cause beans to get stuck between the wires in the oven wall, requiring frequent disassembly to remove them. While perforations in the inner pot wall limit the size of the openings, this method is inefficient at removing silver shavings, leaving many in the finished coffee.

[0006] Neither of the above two designs utilizes the residual heat of the exhaust gas, resulting in low energy efficiency. Based on this, we propose a high-efficiency coffee roaster with top air intake that fully recovers heat energy. Summary of the Invention

[0007] The main objective of this invention is to provide a high-efficiency coffee roaster with top air intake and full heat recovery, which can effectively solve the problems in the background art.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A high-efficiency coffee roaster with top air intake and full heat recovery includes a furnace shell and a control system. The control system is fixedly installed on the inner bottom wall of the furnace shell. A feed inlet is provided at the upper right corner of the furnace shell. A feed door is rotatably connected to the inner wall of the furnace shell at the feed inlet. A guide plate is fixedly installed on the inner wall of the furnace shell. An inner furnace is provided on the inner wall of the furnace shell below the guide plate. A motor is fixedly installed inside the back of the furnace shell.

[0009] Preferably, the inner furnace has parallel slots inside, a temperature sensor is fixedly installed on the inner wall of the inner furnace, and two sets of stirring blades are provided inside the inner furnace.

[0010] Preferably, a bearing is provided between the inner furnace and the motor, a heating tube is fixedly installed on the back of the inner furnace near the top, a heat insulation layer is provided on the back and around the inner furnace, and a gap is left between the furnace shell and the heat insulation layer as a pre-channel for air to enter the air inlet at the top of the inner furnace.

[0011] Preferably, a hot air outlet pipe is connected to the bottom of the inner furnace, and the end of the hot air outlet pipe away from the inner furnace is fixedly connected to an induced draft fan. A hot air outlet is provided at the connection between the furnace shell and the induced draft fan. An air intake fan is provided on the left side of the furnace shell and below the hot air outlet. A cooling fan is fixedly installed on the inner bottom wall of the furnace shell and to the right of the control system. A discharge cooling plate is provided above the cooling fan.

[0012] Preferably, a silver sheet drawer is slidably connected inside the furnace shell and below the inner furnace. The silver sheet drawer can be pulled out from the furnace shell. The silver sheet drawer is provided with a drawer grille. A discharge port is provided between the inner furnace and the silver sheet drawer. The drawer grille is used to guide the silver sheet to fall evenly. At the same time, the drawer grille is used to reflect the heat radiation of the heating tube, improve the thermal efficiency of the whole machine, and at the same time shield the silver sheet to prevent the heating tube from burning the silver sheet.

[0013] Preferably, a discharge door is provided on the right side of the furnace shell, a discharge guide groove is provided on the right side of the furnace shell at the discharge door and the silver drawer, a sampling port is fixedly installed on the right side of the inner furnace, and an air inlet is provided between the furnace shell and the guide plate.

[0014] Preferably, each set of stirring blades has three blades arranged in a ring around the center of the inner furnace. Two sets of stirring blades are arranged in a staggered pattern. Coffee beans are placed inside the inner furnace. As the stirring blades rotate with the inner furnace, they toss the coffee beans, causing them to tumble and be heated evenly. At the same time, the stirring and mixing process generates air convection, improving the efficiency of convective heat transfer. During the stirring and mixing process, the silver skin produced during coffee bean roasting is also shaken off. The heat radiation from the heating tube directly heats the coffee beans in the inner furnace through the parallel slots. The parallel slots separate the silver skin during rotation, causing it to fall into the silver skin drawer below the inner pot. During roasting, the coffee beans will expand. The parallel slots are parallel to the bottom stirring blades to prevent the coffee beans from getting stuck between the bottom stirring blades and the parallel slots after they expand during roasting.

[0015] Preferably, the heating tube penetrates the heat insulation layer and extends into the interior of the inner furnace. The heat insulation layer is fixedly connected to the stirring blade. The blower guides the airflow direction. The airflow flows from the top air inlet to the hot air outlet, passing through the inner furnace and transferring heat energy to the coffee beans in the inner furnace through convection. As it flows downward, it blows the silver foil through parallel slots into the silver foil drawer at the bottom of the inner pot.

[0016] Preferably, the hot air inside the inner furnace enters from the guide plate, exits from the hot air outlet pipe, and finally exits from the furnace shell through the hot air outlet. The induced draft fan guides the airflow from top to bottom. During this process, the airflow passes over the heating pipe through the guide plate, and the induced draft fan ensures that the newly entered cold air and the heated hot air are fully mixed, so that the air entering the furnace shell is heated evenly and fully, and the temperature is fully increased, providing a sufficient convective heat source for the furnace shell.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This high-efficiency coffee roaster with top air intake fully recovers heat energy, making full use of the residual heat of exhaust gas to preheat the air entering the furnace, thus improving energy efficiency. The air intake airflow passes through the gap between the insulation layer and the outer shell of the machine body, cooling the outer shell while preheating.

[0019] 2. This high-efficiency coffee roaster features a top-intake design that fully recovers heat energy. The top air inlet and bottom fan guide the airflow in a regular manner from top to bottom through the inner pot. The top heating element and guide vanes ensure that the airflow is fully and evenly mixed and heated before reaching the inner pot. The high-temperature airflow provides ample convective heat for the coffee roasting process, resulting in more even roasting of the coffee beans. The regular airflow guided by the fan effectively removes the smoke generated during roasting, preventing unpleasant smoky flavors from remaining in the finished product.

[0020] 3. This high-efficiency coffee roaster features top air intake for efficient heat recovery. The downward airflow combined with gravity effectively removes the silver hue produced during roasting, preventing it from remaining in the finished product. The slots in the inner pot, parallel to the bottom stirring plate, prevent coffee beans from getting stuck, while the elongated slots facilitate the passage of sheet-like silver hues.

[0021] 4. This high-efficiency coffee roaster features top air intake for efficient heat recovery. Its regularly slotted mesh support structure provides greater strength and is less prone to deformation or damage during long-term use. The inwardly tilted discharge port guides the roasted material to fall into the cooling tray, which can then be placed at the bottom of the roasting chamber, thus reducing the size of the equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the furnace shell structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the discharge gate structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the feed gate structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the stirring plate structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the air inlet structure of the present invention;

[0028] Figure 7 This is a schematic diagram of the intake fan structure of the present invention.

[0029] In the diagram: 1. Furnace shell; 2. Feed inlet; 3. Feed gate; 4. Baffle plate; 5. Inner furnace; 6. Parallel slot; 7. Temperature sensor; 8. Stirring blade; 9. Motor; 10. Bearing; 11. Heating tube; 12. Thermal insulation layer; 13. Hot air outlet pipe; 14. Exhaust fan; 15. Hot air outlet; 16. Intake fan; 17. Control system; 18. Cooling fan; 19. Discharge cooling plate; 20. Silver-skin drawer; 21. Drawer grille; 22. Discharge port; 23. Discharge guide chute; 24. Discharge gate; 25. Sampling port; 26. Air inlet. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] Example 1

[0032] like Figure 1-6 As shown, a high-efficiency coffee roaster with top air intake and full heat recovery includes a furnace shell 1 and a control system 17. The control system 17 is fixedly installed on the inner bottom wall of the furnace shell 1. A feed inlet 2 is provided at the upper right corner of the furnace shell 1. A feed door 3 is rotatably connected to the inner wall of the furnace shell 1 at the feed inlet 2. A guide plate 4 is fixedly installed on the inner wall of the furnace shell 1. An inner furnace 5 is provided on the inner wall of the furnace shell 1 below the guide plate 4. A motor 9 is fixedly installed inside the back of the furnace shell 1.

[0033] The inner furnace 5 has parallel slots 6 inside, and a temperature sensor 7 is fixedly installed on the inner wall of the inner furnace 5. The inner furnace 5 has two sets of stirring blades 8 inside, with three stirring blades 8 in each set, which are distributed in a ring around the center of the inner furnace 5. The two sets of stirring blades 8 are arranged in a cross pattern. Coffee beans are placed inside the inner furnace 5. The stirring blades 8 throw the coffee beans up as the inner furnace 5 rotates.

[0034] A bearing 10 is installed between the inner furnace 5 and the motor 9. A heating tube 11 is fixedly installed on the back of the inner furnace 5 near the top. A heat insulation layer 12 is provided on the back and around the inner furnace 5. A gap is left between the furnace shell 1 and the heat insulation layer 12 as a pre-channel for air to enter the air inlet at the top of the inner furnace 5. The heat radiation of the heating tube 11 directly heats the coffee beans in the inner furnace 5 through the parallel slot 6. During the roasting process, the coffee beans will expand. The parallel slot 6 is parallel to the bottom stirring plate 8 to prevent the coffee beans from getting stuck at the bottom stirring plate 8 and the parallel slot 6 after they expand during the roasting process.

[0035] A hot air outlet pipe 13 is connected to the bottom of the inner furnace 5. The end of the hot air outlet pipe 13 away from the inner furnace 5 is fixedly connected to the induced draft fan 14. A hot air outlet 15 is provided at the connection between the furnace shell 1 and the induced draft fan 14. An air intake fan 16 is provided on the left side of the furnace shell 1 and below the hot air outlet 15. A cooling fan 18 is fixedly installed on the inner bottom wall of the furnace shell 1 and to the right of the control system 17. A discharge cooling plate 19 is provided above the cooling fan 18.

[0036] The heating tube 11 passes through the heat insulation layer 12 and extends into the interior of the inner furnace 5. The heat insulation layer 12 is fixedly connected to the stirring plate 8. The blower 14 guides the flow direction of the airflow. The airflow flows from the air inlet at the top to the hot air outlet. During the process, it passes through the inner furnace 5 and transfers heat energy to the coffee beans in the inner furnace 5 through convection.

[0037] Hot air inside the inner furnace 5 enters through the guide plate 4, exits through the hot air outlet pipe 13, and finally exits from the furnace shell 1 through the hot air outlet 15. The induced draft fan 14 guides the airflow from top to bottom. During this process, the airflow passes over the heating pipe 11 through the action of the guide plate 4. The induced draft fan 14 makes the newly entered cold air and the heated hot air fully mixed, so that the air entering the furnace shell 1 is heated evenly and fully, and the temperature is fully increased, providing a sufficient convective heat source for the furnace shell 1.

[0038] In this embodiment, the user adds coffee beans into the inner furnace 5 through the feed inlet 2, and then starts the coffee machine. The motor 9 drives the inner furnace 5 to rotate. The stirring blade 8 inside the inner furnace 5 comes into contact with the coffee beans, causing the coffee beans to tumble and be heated evenly. At the same time, the stirring and mixing process generates air convection, which improves the efficiency of convective heat transfer. During the stirring and mixing process, the silver skin produced during the roasting of coffee beans can also be shaken off completely, and the silver skin is separated in conjunction with the rotation of the parallel slot 6.

[0039] While the coffee beans are being roasted by the stirring blade 8, the intake fan 16 rotates to introduce air into the furnace chamber, and works in conjunction with the induced draft fan 14 to guide the airflow. The air flows from the intake fan 16 to the top of the inner furnace 5, then flows into the inner furnace 5, and finally enters the hot air outlet pipe 13, forming a complete flow. At the same time, the cold air intake airflow forms an air curtain between the control system 17 and the induced draft fan 14, which insulates the high temperature of the induced draft fan 14 and dissipates its heat. It also absorbs the heat energy of the induced draft fan 14 to preheat the air entering the furnace chamber shell 1.

[0040] The airflow flows from top to bottom from the inner furnace 5. During this process, the airflow passes through the heating tube 11 through the action of the guide plate 4. Utilizing the physical property of hot air rising, the newly entered cold air is fully mixed with the heated hot air under the action of the induced draft fan 14. This ensures that the air entering the furnace shell 1 is heated evenly and fully, and the temperature is fully increased. This provides a sufficient convective heat source for the furnace shell 1, making full use of the waste heat of the exhaust gas to preheat the air entering the furnace shell 1 and improve energy efficiency.

[0041] The heating element 11 is located on the back of the inner oven 5 and near the top, which prevents the silver foil that falls off during baking from burning on the heating element, thus avoiding the smoke and unpleasant burnt smell and the impact on the lifespan of the heating element.

[0042] Example 2

[0043] like Figure 3-7As shown, a silver foil drawer 20 is slidably connected inside the furnace shell 1 and below the inner furnace 5. The silver foil drawer 20 can be pulled out from the furnace shell 1. A drawer grille 21 is provided on the silver foil drawer 20 to guide the silver foil to fall evenly. A discharge port 22 is provided between the inner furnace 5 and the silver foil drawer 20. A discharge door 24 is provided on the right side of the furnace shell 1. After roasting, the discharge door 24 is opened, and the coffee beans fall from the discharge door 24 into the discharge cooling tray 19 below. The drawer grille 21 on the outside of the discharge door 24 is used to guide the coffee beans to fall into the discharge cooling tray 19 to prevent spillage. A discharge guide groove 23 is provided on the right side of the furnace shell 1 at the discharge door 24 and the silver foil drawer 20. A sampling port 25 is fixedly installed on the right side of the inner furnace 5. An air inlet 26 is provided between the furnace shell 1 and the guide plate 4.

[0044] In this embodiment, a drawer grille 21 is provided above the silver skin drawer 20 to guide the silver skin to fall evenly. At the same time, the drawer grille 21 is used to reflect the heat radiation of the heating tube 11, improve the thermal efficiency of the whole machine, and at the same time block the silver skin to prevent the heating tube 11 from burning the silver skin. The parallel slot 6 separates the silver skin during rotation. During the downward flow of air, the silver skin is blown down through the parallel slot 6 into the silver skin drawer 20 at the bottom of the inner pot.

[0045] During the roasting process, users can observe the state of coffee beans through the sampling port 25. After roasting, the user can open the discharge door 24 and the coffee beans will fall from the discharge door 24 into the discharge cooling tray 19 below. The drawer grille 21 can be used as a handle for the discharge cooling tray 19.

[0046] Finally, after the coffee beans fall into the discharge cooling tray 19, the cooling fan 18 guides the external airflow through the machine body to cool the coffee beans by drawing air.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency coffee roaster with top air intake and full heat recovery, comprising a furnace shell (1) and a control system (17), wherein the control system (17) is fixedly installed on the inner bottom wall of the furnace shell (1), characterized in that: A feed inlet (2) is provided at the upper right corner of the furnace shell (1). A feed gate (3) is rotatably connected to the inner wall of the furnace shell (1) at the feed inlet (2). A guide plate (4) is fixedly installed on the inner wall of the furnace shell (1). An inner furnace (5) is provided on the inner wall of the furnace shell (1) below the guide plate (4). A motor (9) is fixedly installed inside the back of the furnace shell (1). A parallel slot (6) is provided inside the inner furnace (5). A temperature sensor (7) is fixedly installed on the inner wall of the inner furnace (5). The inner furnace (5) is equipped with... Two sets of stirring blades (8); a bearing (10) is provided between the inner furnace (5) and the motor (9); a heating pipe (11) is fixedly installed on the back of the inner furnace (5) and near the top; a heat insulation layer (12) is provided on the back and around the inner furnace (5); a hot air outlet pipe (13) is connected to the bottom of the inner furnace (5); the end of the hot air outlet pipe (13) away from the inner furnace (5) is fixedly connected to the induced draft fan (14); a heat exchanger is provided at the connection between the furnace shell (1) and the induced draft fan (14). An airflow outlet (15) is provided on the left side of the furnace shell (1) and below the hot airflow outlet (15). An air intake fan (16) is fixedly installed on the inner bottom wall of the furnace shell (1) and to the right of the control system (17). A discharge cooling plate (19) is provided above the cooling fan (18). A silver drawer (20) is slidably connected inside the furnace shell (1) and below the inner furnace (5). The silver drawer (20) can be pulled out from inside the furnace shell (1). The silver drawer (20) is provided with a drawer grid (21), and the inner furnace (5) and the silver drawer (20) are provided with a discharge port (22); the right side of the furnace shell (1) is provided with a discharge door (24), and the right side of the furnace shell (1) and the location of the discharge door (24) and the silver drawer (20) are provided with a discharge guide groove (23); the right side of the inner furnace (5) is fixedly installed with a sampling port (25), and the furnace shell (1) and the guide plate (4) are provided with an air inlet (26).

2. The high-efficiency coffee roaster with top air intake and full heat recovery according to claim 1, characterized in that: The set of stirring blades (8) consists of three pieces, which are arranged in a ring around the center of the inner furnace (5), which contains coffee beans.

3. A high-efficiency coffee roaster with top air intake and full heat recovery as described in claim 1, characterized in that: The hot air in the inner furnace (5) enters from the guide plate (4), flows out from the hot air outlet pipe (13), and finally flows out from the furnace shell (1) through the hot air outlet (15).

Images