Energy-saving drying device with heat recovery

CN224316600UActive Publication Date: 2026-06-02YANTAI DINGKE MASCH CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
YANTAI DINGKE MASCH CO LTD
Filing Date
2025-05-26
Publication Date
2026-06-02

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  • Figure CN224316600U_ABST
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Abstract

This utility model relates to the technical field of drying devices, specifically an energy-saving drying device with heat recovery. It includes a drying chamber with a perforated support platform at the bottom for placing stainless steel beer barrels to be dried. A hot air output component is located at the top of the drying chamber, and a dehumidification assembly is also located at the top. The dehumidification assembly includes a dehumidification box connected to the drying chamber via a return pipe. The dehumidification box has an adjustable housing, divided into two dehumidification compartments by a partition. A hot air generating component for inputting hot airflow into a rotating pipe is located on the left side of the dehumidification box. This energy-saving drying device with heat recovery, through the cooperation of the return pipe and the dehumidification assembly, recovers the humid hot airflow from the drying chamber back to the dehumidification box. After dehumidification with silica gel desiccant, the airflow is re-input into the hot air generating component for recycling. This effectively reduces energy waste caused by direct heat emission, achieves efficient heat recovery, and significantly reduces energy consumption during the drying process.
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Description

Technical Field

[0001] This utility model relates to the field of drying equipment technology, specifically to an energy-saving drying equipment with heat recovery. Background Technology

[0002] Stainless steel beer kegs are essential equipment in the beer production and storage process. Due to the excellent corrosion resistance and mechanical strength of stainless steel, breweries widely use this material to manufacture beer kegs to ensure the quality and safety of beer during fermentation, storage, and transportation.

[0003] During the manufacturing process of stainless steel beer kegs, a cofferdam filler is typically used at the seams of the keg. This filler is primarily used to provide excellent adhesion and sealing properties, effectively preventing beer leakage during storage and transportation, thereby ensuring product safety and quality. After the filler is applied to the stainless steel beer keg, it needs to undergo a drying process to achieve its curing and bonding functions, ensuring that the sealing performance meets design requirements.

[0004] However, existing drying equipment often uses hot air drying to cure and dry the dam filler adhesive. While effective, this method results in significant heat loss because the hot air generated during drying is directly discharged afterward. This not only reduces drying efficiency but also wastes energy.

[0005] Therefore, existing drying equipment urgently needs improvement in terms of thermal efficiency and energy consumption to meet the higher requirements of modern production for energy conservation and environmental protection. In view of this, we propose an energy-saving drying equipment with heat recovery. Utility Model Content

[0006] The purpose of this invention is to provide an energy-saving drying device with heat recovery to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An energy-saving drying unit with heat recovery, including a drying chamber to provide a closed drying environment, combined with... Figure 1 and Figure 2 As shown, the front side of the drying chamber is hinged with an operating door for opening and closing the drying chamber and achieving sealing. The operating door is equipped with a heat-insulated observation window for observing the internal condition and preventing heat loss. The bottom of the drying chamber is equipped with a hollow support platform for placing the stainless steel beer barrels to be dried. The hollow structure promotes the uniform penetration of hot airflow to dry the bottom of the stainless steel beer barrels.

[0009] Combination Figure 3 and Figure 4As shown, the top of the drying chamber is equipped with a hot air output component for distributing and outputting hot air. The hot air output component includes a rotating tube rotatably connected to the top of the drying chamber via a bearing, which drives the L-shaped air guide tube to rotate, causing the two L-shaped air guide tubes to rotate on the outside of the stainless steel beer barrel, thereby improving the drying uniformity. The bottom end of the rotating tube is connected to two L-shaped air guide tubes via a T-junction, which is used to guide the hot air to different directions. The outer wall of the L-shaped air guide tube is provided with multiple air outlets arranged vertically and horizontally at equal intervals. The output end of the air outlets faces the stainless steel beer barrel, which is used to evenly spray hot air onto the surface of the beer barrel.

[0010] Combination Figure 2 and Figure 5 As shown, a dehumidification assembly is located at the top and near the right side of the drying chamber to remove moisture from the circulating hot airflow. The dehumidification assembly includes a dehumidification box, which is connected to the drying chamber via a return pipe. The return pipe guides the hot airflow containing moisture from the drying chamber into the dehumidification box, allowing the hot airflow to be circulated and thus achieving energy saving. The dehumidification box has an adjustable housing, which is divided into two dehumidification compartments by a partition. Only one dehumidification compartment is used at a time. The purpose of having two dehumidification compartments is to facilitate quick replacement of silica gel desiccant without stopping the machine. When replacing the silica gel desiccant, the operator first places the new silica gel desiccant into the outer dehumidification compartment, then pushes the housing to quickly move the outer dehumidification compartment into the inner housing, thus moving the original dehumidification compartment to the outside. The operator can then remove the silica gel desiccant that has absorbed moisture from the dehumidification compartment. The dehumidification compartment contains silica gel desiccant for dehumidification.

[0011] The left side of the dehumidification box is equipped with a hot air generating component for inputting hot airflow into the rotating tube, which generates and delivers high-temperature hot air.

[0012] Preferred, such as Figure 2 As shown, a first frame-shaped magnetic pad is provided on the front side of the drying chamber, and a second frame-shaped magnetic pad is provided at the outer edge of the rear side of the operating door, which is attracted and connected to the first frame-shaped magnetic pad, thereby enhancing the sealing performance and reducing heat leakage.

[0013] The hollow support platform is provided with legs at its bottom and near its four corners. The bottom of the legs is bolted to the bottom of the drying chamber to securely support the hollow support platform.

[0014] Preferred, such as Figure 4As shown, a motor is installed at the top of the drying chamber to drive the drive gear to rotate. An external power supply and controller are connected to the motor. The output shaft of the motor passes through the top of the drying chamber and is coaxially connected to the drive gear. The outer wall of the rotating tube is provided with a driven gear that meshes with the drive gear to transmit power to the driven gear and drive the rotating tube to rotate so as to evenly distribute hot air.

[0015] Preferred, such as Figure 5 As shown, the dehumidification box is equipped with two frame-shaped partitions arranged symmetrically on the left and right sides. The left and right sides of the box body are respectively attached to the opposite sides of the two frame-shaped partitions to limit the box body.

[0016] Preferred, such as Figure 6 As shown, the dehumidifier has rectangular openings on both the front and rear sides for the box body to pass through, which facilitates the sliding adjustment of the box body. The inner wall of the rectangular opening is fitted with a frame-shaped sealing gasket, and the inner wall of the frame-shaped sealing gasket is in contact with the outer wall of the box body to prevent hot air from escaping from the rectangular opening.

[0017] Preferred, such as Figure 5 As shown, protective nets are provided on both the left and right sides of the dehumidification chamber to prevent silica gel desiccant particles from entering the airflow channel. When one of the dehumidification chambers is completely located inside the dehumidification box, the dehumidification chamber is connected to the dehumidification box through the corresponding protective net to ensure that the airflow passes through the desiccant.

[0018] Handles are provided in the middle of both the front and rear sides of the box, making it easy for operators to push and pull the box. Limiting plates are provided at the bottom of both the front and rear sides of the box. When the front side of the box is on the same plane as the front side of the dehumidification box, the front dehumidification chamber is inside the dehumidification box, and the rear dehumidification chamber is outside. The rear side of the front limiting plate is in contact with the front side of the dehumidification box. When the rear side of the box is on the same plane as the rear side of the dehumidification box, the rear dehumidification chamber is inside the dehumidification box, and the front dehumidification chamber is outside. The front side of the rear limiting plate is in contact with the rear side of the dehumidification box. This allows staff to quickly change the position of the dehumidification chamber without worrying about the box separating from the dehumidification box.

[0019] Preferred, such as Figure 4 As shown, the hot air generating component includes a rectangular tube connected to the dehumidification box as a hot air delivery channel. The rectangular tube is equipped with a fan and an electric heating grid to heat the air into high-temperature hot air. It is powered by an external power supply and a controller. The left end of the rectangular tube is equipped with an L-shaped hot air pipe to guide the hot air to the rotating pipe. The output end of the L-shaped hot air pipe is rotatably connected to the input end of the rotating pipe through a rotary joint, allowing the connection to be maintained when the rotating pipe rotates.

[0020] The top of the drying chamber is provided with an L-shaped plate, and the output end of the L-shaped hot air pipe passes through the top of the L-shaped plate, which serves to fix the L-shaped hot air pipe.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. This energy-saving drying device with heat recovery, through the cooperation of the return pipe and the dehumidification component, recovers the hot air containing moisture in the drying chamber to the dehumidification box, and after being dehumidified by silica gel desiccant, it is reintroduced into the hot air generation component for recycling, effectively reducing energy waste caused by direct heat emission, realizing efficient heat recovery, and significantly reducing energy consumption in the drying process.

[0023] 2. This energy-saving drying device with heat recovery uses a rotatable rotating tube to drive the L-shaped air guide pipe and air outlet pipe to rotate, so that the hot airflow evenly covers the surface of the stainless steel beer barrel from multiple angles and directions, avoiding the problem of local overheating or insufficient drying, ensuring the consistent curing effect of the dam filling adhesive, and improving the reliability of the sealing performance.

[0024] 3. This energy-saving drying device with heat recovery features a dual-chamber sliding box in the dehumidification component. The two dehumidification chambers can be used alternately, allowing operators to quickly switch between chambers with saturated desiccant without stopping the machine. This significantly reduces production downtime and ensures continuous operation efficiency.

[0025] 4. This energy-saving drying device with heat recovery features a dehumidification component box that can be quickly slidably adjusted via handles and limit plates. A protective net prevents desiccant particles from entering the airflow channel. The structure is simple and easy to maintain. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the overall structure of this utility model in use.

[0028] Figure 3 This is a cross-sectional structural diagram of the drying chamber in this utility model;

[0029] Figure 4 This is a partial structural schematic diagram of the present invention;

[0030] Figure 5 This is a schematic diagram of the dehumidification component structure in this utility model;

[0031] Figure 6 This is a cross-sectional structural diagram of the dehumidification box in this utility model;

[0032] Figure 7 This is a schematic diagram of the box structure in this utility model;

[0033] In the diagram: 100, Drying chamber; 110, First frame-shaped magnetic pad; 120, L-shaped plate; 200, Operating door; 210, Second frame-shaped magnetic pad; 220, Heat-insulated observation window; 300, Hollowed-out support platform; 310, Support leg; 400, Hot air output component; 410, Rotating pipe; 411, Driven gear; 420, L-shaped air guide pipe; 421, Air outlet pipe; 500, Motor; 510, Drive gear; 60 0. Hot air generating assembly; 610. Rectangular tube; 620. Fan; 630. Electric heating grid; 640. L-shaped hot air duct; 650. Rotary joint; 700. Dehumidification assembly; 710. Dehumidification box; 711. Rectangular opening; 720. Box body; 721. Dehumidification chamber; 722. Protective net; 723. Handle; 724. Limiting plate; 730. Frame-shaped partition; 740. Frame-shaped sealing gasket; 800. Return pipe. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] Please see Figures 1-7 This utility model provides a technical solution:

[0037] An energy-saving drying device with heat recovery, including a drying chamber 100, for providing a closed drying environment, combined with... Figure 1 and Figure 2 As shown, the front side of the drying chamber 100 is hinged with an operating door 200 for opening and closing the drying chamber 100 and achieving sealing. The operating door 200 is provided with a heat-insulated observation window 220 for observing the internal condition and preventing heat loss. The bottom of the drying chamber 100 is provided with a hollow support platform 300 for placing the stainless steel beer barrels to be dried. The hollow structure promotes the uniform penetration of hot airflow to dry the bottom of the stainless steel beer barrels.

[0038] Combination Figure 3 and Figure 4 As shown, a hot air output component 400 is provided at the top of the drying chamber 100 for distributing and outputting hot air. The hot air output component 400 includes a rotating pipe 410 rotatably connected to the top of the drying chamber 100 via a bearing, which drives the L-shaped air guide pipe 420 to rotate, so that the two L-shaped air guide pipes 420 rotate on the outside of the stainless steel beer barrel, thereby improving the drying uniformity. The bottom end of the rotating pipe 410 is connected to two L-shaped air guide pipes 420 via a three-way pipe, which is used to guide the hot air to different directions. The outer wall of the L-shaped air guide pipe 420 is provided with multiple air outlet pipes 421 arranged vertically and horizontally at equal intervals. The output end of the air outlet pipe 421 faces the stainless steel beer barrel, which is used to spray hot air evenly onto the surface of the beer barrel.

[0039] Combination Figure 2 and Figure 5 As shown, a dehumidification assembly 700 is located at the top and near the right side of the drying chamber 100 to remove moisture from the circulating hot airflow. The dehumidification assembly 700 includes a dehumidification box 710, which is connected to the drying chamber 100 via a return pipe 800. The return pipe 800 guides the hot airflow containing moisture from the drying chamber 100 into the dehumidification box 710, allowing the hot airflow to be circulated and thus achieving energy saving. The dehumidification box 710 is equipped with a front-to-back adjustable housing 720, which is divided into two dehumidification chambers 721 by a partition plate. The two dehumidification chambers 721 are used in... Only one is used at a time. The purpose of setting two dehumidification chambers 721 is to facilitate the quick replacement of silica gel desiccant by the staff without stopping the machine. When replacing the silica gel desiccant, the staff first places the new silica gel desiccant into the outer dehumidification chamber 721, and then pushes the box 720 to quickly move the outer dehumidification chamber 721 into the box 720. This moves the dehumidification chamber 721 that was originally in the box 720 to the outside. The staff can then take out the silica gel desiccant that has absorbed moisture from the dehumidification chamber 721. The dehumidification chamber 721 contains silica gel desiccant for dehumidification.

[0040] The left side of the dehumidification box 710 is provided with a hot air generating assembly 600 for inputting hot airflow into the rotating tube 410, which generates and delivers high-temperature hot air.

[0041] In this embodiment, as Figure 2 As shown, a first frame-shaped magnetic pad 110 is provided on the front side of the drying chamber 100, and a second frame-shaped magnetic pad 210 is provided at the outer edge of the rear side of the operating door 200, which is attracted and connected to the first frame-shaped magnetic pad 110, to enhance the sealing and reduce heat leakage.

[0042] The bottom of the hollow support platform 300 and near the four corners are provided with support legs 310. The bottom of the support legs 310 is installed to the bottom of the drying chamber 100 by bolts to stably support the hollow support platform 300.

[0043] Specifically, such as Figure 4 As shown, a motor 500 is provided at the top of the drying chamber 100 to drive the drive gear 510 to rotate. It is connected to an external power supply and controller. The output shaft of the motor 500 passes through the top of the drying chamber 100 and is coaxially connected to the drive gear 510. The outer wall of the rotating tube 410 is provided with a driven gear 411 that meshes with the drive gear 510 to transmit power to the driven gear 411, thereby driving the rotating tube 410 to rotate to evenly distribute hot air.

[0044] Furthermore, such as Figure 5 As shown, the dehumidification box 710 has two frame-shaped partitions 730 arranged symmetrically on the left and right sides. The left and right sides of the box body 720 are respectively attached to the opposite sides of the two frame-shaped partitions 730 to limit the box body 720.

[0045] Furthermore, such as Figure 6 As shown, the dehumidification box 710 has rectangular openings 711 on both the front and rear sides for the box body 720 to pass through, which facilitates the sliding adjustment of the box body 720. A frame-shaped sealing gasket 740 is embedded in the inner wall of the rectangular opening 711. The inner wall of the frame-shaped sealing gasket 740 is in contact with the outer wall of the box body 720 to prevent hot air from escaping from the rectangular opening 711.

[0046] Furthermore, such as Figure 5 As shown, protective nets 722 are provided on both the left and right sides of the dehumidification chamber 721 to prevent silica gel desiccant particles from entering the airflow channel. When one of the dehumidification chambers 721 is completely inside the dehumidification box 710, the dehumidification chamber 721 is connected to the dehumidification box 710 through the corresponding protective net 722 to ensure that the airflow passes through the desiccant.

[0047] Handles 723 are provided in the middle of both the front and rear sides of the box 720, making it easy for operators to push and pull the box 720. Limiting plates 724 are provided at the bottom of both the front and rear sides of the box 720. When the front side of the box 720 is on the same plane as the front side of the dehumidification box 710, the front dehumidification chamber 721 is inside the dehumidification box 710, and the rear dehumidification chamber 721 is outside. The rear side of the front limiting plate 724 is in contact with the front side of the dehumidification box 710. When the rear side of the box 720 is on the same plane as the rear side of the dehumidification box 710, the rear dehumidification chamber 721 is inside the dehumidification box 710, and the front dehumidification chamber 721 is outside. The front side of the rear limiting plate 724 is in contact with the rear side of the dehumidification box 710, making it easy for staff to quickly change the position of the dehumidification chamber 721 without worrying about the box 720 separating from the dehumidification box 710.

[0048] Furthermore, such as Figure 4 As shown, the hot air generating assembly 600 includes a rectangular tube 610 connected to the dehumidification box 710 as a hot air delivery channel. The rectangular tube 610 is equipped with a fan 620 and an electric heating grid 630 to heat the air into high-temperature hot air. It is powered by an external power supply and a controller. The left end of the rectangular tube 610 is provided with an L-shaped hot air duct 640 to guide the hot air to the rotating tube 410. The output end of the L-shaped hot air duct 640 is rotatably connected to the input end of the rotating tube 410 through a rotary joint 650, allowing the connection to remain when the rotating tube 410 rotates.

[0049] The top of the drying chamber 100 is provided with an L-shaped plate 120, and the output end of the L-shaped hot air pipe 640 passes through the top of the L-shaped plate 120, which serves to fix the L-shaped hot air pipe 640.

[0050] In this embodiment, the energy-saving drying device with heat recovery is used by placing the stainless steel beer barrel to be dried on the hollow support platform 300 inside the drying chamber 100, closing the operating door 200 and sealing it by adsorption between the first frame-shaped magnetic pad 110 and the second frame-shaped magnetic pad 210, and then starting the fan 620 and electric heating grid 630 in the hot air generating assembly 600. The cold air is heated by the rectangular tube 610 and then delivered to the rotating tube 410 through the L-shaped hot air pipe 640. The motor 500 drives the drive gear 510 to drive the driven gear 411 to rotate, so that the rotating tube 410 and the connected L-shaped air guide pipe 420 rotate around the outer wall of the stainless steel beer barrel, and the hot air is evenly sprayed out through the air outlet pipe 421; the drying process... In the process, the hot air containing moisture enters the dehumidification chamber 710 through the return pipe 800. When it flows through the dehumidification chamber 721 inside the box body 720, the moisture is absorbed by the silica gel desiccant. The dried airflow re-enters the hot air generating component 600 for circulation. When the silica gel desiccant in the dehumidification chamber 721 is saturated, the operator first places new silica gel desiccant in the unused external dehumidification chamber 721, and pushes the box body 720 through the handle 723 to slide the unused external dehumidification chamber 721 into the dehumidification chamber 710. At the same time, the saturated dehumidification chamber 721 is removed and the saturated desiccant is taken out. The drying status can be monitored in real time through the heat-insulated observation window 220. After drying is completed, the equipment is turned off and the operating door 200 is opened to take out the stainless steel beer barrel.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. Energy-saving drying device with heat recovery, comprising a drying chamber (100), the front side of which is hingedly articulated by a hinge with an operating door (200), provided with a heat-insulating observation window (220), characterized in that: The bottom of the drying chamber (100) is provided with a hollow support platform (300) for placing stainless steel beer barrels to be dried. The top of the drying chamber (100) is provided with a hot air output device (400). The hot air output device (400) includes a rotating pipe (410) rotatably connected to the top of the drying chamber (100) via a bearing. The bottom end of the rotating pipe (410) is connected to two L-shaped air guide pipes (420) via a T-connector. The outer wall of the L-shaped air guide pipes (420) is provided with multiple air outlet pipes (421) arranged vertically at equal intervals. The output end of the air outlet pipes (421) faces the stainless steel beer barrel. A dehumidification assembly (700) is provided at the top and near the right side of the drying chamber (100). The dehumidification assembly (700) includes a dehumidification box (710), which is connected to the drying chamber (100) through a return pipe (800). The dehumidification box (710) is provided with a box body (720) that can be adjusted back and forth. The box body (720) is divided into two dehumidification chambers (721) by a partition plate. Silica gel desiccant for dehumidification is placed in the dehumidification chamber (721). A hot air generating assembly (600) for inputting hot airflow into the rotating pipe (410) is provided on the left side of the dehumidification box (710).

2. The energy-saving drying device with heat recovery according to claim 1, characterized in that: The front side of the drying chamber (100) is provided with a first frame-shaped magnetic pad (110), and the outer edge of the rear side of the operating door (200) is provided with a second frame-shaped magnetic pad (210) that is attracted and connected to the first frame-shaped magnetic pad (110).

3. The energy-saving drying device with heat recovery according to claim 1, characterized in that: The bottom of the hollow support platform (300) and near the four corners are provided with support legs (310), and the bottom of the support legs (310) is installed to the bottom of the drying chamber (100) by bolts.

4. The energy-saving drying device with heat recovery according to claim 1, characterized in that: The top of the drying chamber (100) is equipped with a motor (500), the output shaft of the motor (500) passes through the top of the drying chamber (100) and is coaxially connected to a drive gear (510), and the outer wall of the rotating tube (410) is equipped with a driven gear (411) that meshes with the drive gear (510).

5. The energy-saving drying device with heat recovery according to claim 1, characterized in that: The dehumidification box (710) is provided with two frame-shaped partitions (730) arranged symmetrically on the left and right sides. The left and right sides of the box body (720) are respectively attached to the opposite sides of the two frame-shaped partitions (730).

6. The energy-saving drying device with heat recovery according to claim 1, characterized in that: The dehumidification box (710) has rectangular openings (711) on both the front and rear sides for the box body (720) to pass through. The inner wall of the rectangular opening (711) is fitted with a frame-shaped sealing gasket (740), and the inner wall of the frame-shaped sealing gasket (740) is in contact with the outer wall of the box body (720).

7. The energy-saving drying device with heat recovery according to claim 1, characterized in that: The dehumidification chamber (721) is provided with protective nets (722) on both the left and right sides. When one of the dehumidification chambers (721) is completely located inside the dehumidification box (710), the dehumidification chamber (721) is connected to the dehumidification box (710) through the corresponding protective nets (722).

8. The energy-saving drying device with heat recovery according to claim 1, characterized in that: Handles (723) are provided in the middle of the front and rear sides of the box body (720), and limiting plates (724) are provided at the bottom of the front and rear sides of the box body (720).

9. The energy-saving drying device with heat recovery according to claim 1, characterized in that: The hot air generating assembly (600) includes a rectangular tube (610) communicating with the dehumidification box (710). A fan (620) and an electric heating grid (630) are provided inside the rectangular tube (610). An L-shaped hot air pipe (640) is provided at the left end of the rectangular tube (610). The output end of the L-shaped hot air pipe (640) is rotatably connected to the input end of the rotating pipe (410) through a rotary joint (650).

10. The energy-saving drying device with heat recovery according to claim 9, characterized in that: The top of the drying chamber (100) is provided with an L-shaped plate (120), and the output end of the L-shaped hot air pipe (640) passes through the top of the L-shaped plate (120).