Vacuum drying equipment with waste heat recovery channel

Abstract

The utility model relates to a waste heat recovery technical field, concretely relates to a vacuum drying equipment with waste heat recovery channel, including drying box, the side wall of drying box is provided with the box door for taking material, the inside of drying box is provided with the heating rod for heating material, the side wall fixedly connected with servo motor of drying box, the inner wall of drying box is rotatably connected with the stirring rod, the one end of stirring rod passes through the outer wall of drying box and is fixedly connected on the output end of servo motor, the top of drying box is fixedly connected with vacuum pump, the top of drying box is fixedly connected with preheating box on the side wall close to vacuum pump. Compared with the prior art, the present application avoids the waste of heat energy caused by the direct discharge of steam to the outside through the exhaust pipe in the prior art, realizes the effective recovery and utilization of latent heat, improves the overall heat energy utilization rate of the equipment, reduces the heating energy consumption, thereby achieving the effect of energy saving and emission reduction and reducing the operating cost.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, and in particular to a vacuum drying device with a waste heat recovery channel. Background Technology

[0002] Currently, vacuum drying equipment is widely used in chemical, food, and pharmaceutical industries. Traditional vacuum drying tanks primarily achieve drying by heating the tank body, causing the material to rapidly evaporate moisture or solvents in a vacuum environment. These drying tanks have a relatively simple structure, generally including a drying chamber, a heating jacket, and a vacuum pumping system. They can meet the dehydration and drying needs of most materials and are therefore commonly used in industrial production.

[0003] A Chinese patent has been published: a high-efficiency and durable vacuum drying jar, patent announcement number: CN211739672U. The patent "includes a jar body, the upper end of which has a feed port that connects to the inner cavity, the bottom of which has a discharge port that connects to the inner cavity, a vacuum drying pump installed on one side of the jar body, a drive motor installed on the other side of the jar body, the drive motor being connected to a turning device, and the turning device being transversely inserted through the middle of the inner cavity."

[0004] Although the drying tank can use a drive motor to turn the material over, accelerating the evaporation of moisture, and use a heating rod to heat the spiral blades, thus accelerating the evaporation of moisture, the existing vacuum drying tank does not have a waste heat recovery structure during operation. A large amount of hot steam generated during the evaporation process is directly discharged to the outside through the exhaust pump and exhaust pipe, resulting in a waste of energy. On the one hand, new heat needs to be continuously provided, increasing energy consumption and production costs. On the other hand, the latent heat carried in the steam is not recovered and utilized, and the material to be dried cannot be preheated, reducing the overall thermal energy utilization rate, which is not conducive to the energy-saving improvement of the equipment and increases the energy consumption burden. Utility Model Content

[0005] In view of this, the purpose of this utility model is to propose a vacuum drying device with a waste heat recovery channel to solve the problem that without a waste heat recovery structure, energy is lost and heat cannot be reused, resulting in energy waste and increased operating costs.

[0006] Based on the above objectives, this utility model provides a vacuum drying device with a waste heat recovery channel, including a drying chamber. The side wall of the drying chamber is provided with a door for material handling. The interior of the drying chamber is provided with a heating rod for heating the material. A servo motor is fixedly connected to the side wall of the drying chamber. A stirring rod is rotatably connected between the inner walls of the drying chamber. One end of the stirring rod passes through the outer wall of the drying chamber and is fixedly connected to the output end of the servo motor. A vacuum pump is fixedly connected to the top of the drying chamber. A preheating chamber is fixedly connected to the side wall of the top of the drying chamber near the vacuum pump. A connecting pipe is connected to the bottom of the preheating chamber, and the connecting pipe is interconnected with the interior of the drying chamber. The input end of the vacuum pump is connected to the interior of the drying chamber. The interior of the preheating chamber is provided with a waste heat recovery mechanism for recovering waste heat and heating the material to be dried, and a temperature equalization mechanism for ensuring the material is fully heated.

[0007] Preferably, the waste heat recovery mechanism includes a cavity formed in the inner wall of the preheating box, the output end of the vacuum pump is connected to the interior of the cavity, the top of the preheating box is connected to a feed inlet for feeding, four flow rings are fixedly connected inside the cavity, the four flow rings are arranged at an angle in pairs, and the top of each of the four flow rings inclined towards the inner wall of the cavity is provided with a flow port for gas and liquid to pass through, and the bottom of the cavity is connected to an exhaust pipe.

[0008] Preferably, the temperature equalization mechanism includes a lifting cylinder fixedly connected to the bottom of the inner wall of the preheating box. The lifting cylinder has material inlets on both the top and bottom sides for material flow. A spiral rod for lifting material to the top of the lifting cylinder is rotatably connected inside the lifting cylinder. The shaft of the spiral rod passes through the outer wall of the preheating box and is fixedly connected to a first conical wheel. A rotating rod is rotatably connected to the top of the preheating box. A belt is fitted between the output end of the servo motor and the outer wall of the rotating rod through a pulley. A second conical tooth is fixedly connected to the end of the rotating rod near the preheating box. The second conical tooth and the first conical wheel mesh with each other.

[0009] Preferably, the outer wall of the lifting cylinder is fixedly connected to a diffuser plate for moving materials toward the inner wall of the preheating box, and the diffuser plate is in the shape of an umbrella.

[0010] Preferably, the inner wall of the preheating box has a sloped structure that gradually tapers from top to bottom. When the material rolls down from the diffuser plate, it will come into contact with the inner wall of the preheating box due to inertia. Since the inner wall of the preheating box has a sloped structure, the material falling into the preheating box will roll on the inner wall of the preheating box during the process of falling under gravity.

[0011] Preferably, the bottom of the preheating box has a conical shape for material to be concentrated at the connecting pipe.

[0012] Preferably, the bottom of the cavity is provided with an inclined structure towards the air outlet near the outer wall of the connecting pipe.

[0013] The beneficial effects of this utility model are: 1. This vacuum drying equipment with waste heat recovery channel, by setting a cavity in the inner wall of the preheating chamber and fixing an inclined flow ring in the cavity, forces the steam to run along a Z-shaped path during the flow process, increasing the contact area and residence time between the steam and the inner wall of the cavity. This ensures that the latent heat in the steam can be fully released and conducted to the inner wall of the preheating chamber. The inner wall of the preheating chamber is made of aluminum alloy, which has excellent thermal conductivity and can quickly introduce the heat in the cavity into the interior of the preheating chamber to preheat the material to be dried. This design avoids the heat energy waste caused by the direct discharge of steam to the outside through the exhaust pipe in the existing technology, realizes the effective recovery and utilization of latent heat, improves the overall thermal energy utilization rate of the equipment, reduces heating energy consumption, and thus achieves the effects of energy saving, emission reduction and reduced operating costs.

[0014] 2. This vacuum drying equipment with a waste heat recovery channel, by setting up a lifting cylinder, a screw rod, and a diffuser plate inside the preheating chamber, allows the material to be continuously lifted to the top of the lifting cylinder by the screw rod after entering the preheating chamber. Then, it is dispersed by the diffuser plate and rolls down onto the inner wall of the preheating chamber. Because the inner wall of the preheating chamber is designed as a gradually tapering inclined structure from top to bottom, the material repeatedly contacts the inner wall due to inertia during its descent and rolls down under gravity. This allows the material to fully absorb the heat transferred to the inner wall through the waste heat recovery mechanism, achieving multiple heating and uniform heating, avoiding the problem of insufficient heating in certain areas. Finally, the material gathers in the conical area at the bottom of the preheating chamber and enters the drying chamber through a connecting pipe, ensuring that the material entering the drying chamber has been fully and uniformly preheated. This mechanism effectively improves drying efficiency, reduces energy consumption, and ensures stable operation and energy-saving effects of the equipment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the overall cross-sectional structure of this utility model; Figure 3 This is a schematic diagram of the internal three-dimensional structure of the preheating box of this utility model; Figure 4This is a three-dimensional structural diagram of the flow ring and flow port of this utility model; Figure 5 This is a three-dimensional structural diagram of the lifting cylinder and screw rod of this utility model.

[0017] The diagram is marked as follows: 1. Drying oven; 2. Oven door; 3. Servo motor; 4. Stirring rod; 5. Heating rod; 6. Vacuum pump; 7. Preheating box; 8. Cavity; 9. Feed inlet; 10. Flow ring; 11. Flow port; 12. Air outlet pipe; 13. Lifting cylinder; 14. Material inlet; 15. Spiral rod; 16. First conical wheel; 17. Rotating rod; 18. Belt; 19. Second conical tooth; 20. Diffuser plate; 21. Connecting pipe. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0019] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] like Figures 1 to 5As shown, a vacuum drying device with a waste heat recovery channel includes a drying chamber 1. The side wall of the drying chamber 1 is provided with a door 2 for material handling. The interior of the drying chamber 1 is provided with a heating rod 5 for heating the material. A servo motor 3 is fixedly connected to the side wall of the drying chamber 1. A stirring rod 4 is rotatably connected between the inner walls of the drying chamber 1. One end of the stirring rod 4 passes through the outer wall of the drying chamber 1 and is fixedly connected to the output end of the servo motor 3. A vacuum pump 6 is fixedly connected to the top of the drying chamber 1. A preheating chamber 7 is fixedly connected to the side wall of the top of the drying chamber 1 near the vacuum pump 6. A connecting pipe 21 is connected to the bottom of the preheating chamber 7. The connecting pipe 21 is interconnected with the interior of the drying chamber 1. The input end of the vacuum pump 6 is connected to the interior of the drying chamber 1. The interior of the preheating chamber 7 is provided with a waste heat recovery mechanism for recovering waste heat to heat the material to be dried. The interior of the preheating chamber 7 is provided with a temperature equalization mechanism for fully heating the material.

[0021] Further, see attached document. Figures 1 to 4 As shown, the waste heat recovery mechanism includes a cavity 8 opened in the inner wall of the preheating box 7. The output end of the vacuum pump 6 is connected to the inside of the cavity 8. The top of the preheating box 7 is connected to a feed port 9 for feeding. An external cover plate can be placed on the top of the feed port 9 to seal it during preheating. Four flow rings 10 are fixedly connected inside the cavity 8. The four flow rings 10 are arranged in pairs at an inclination. The top of the side of the four flow rings 10 that is inclined toward the inner wall of the cavity 8 is provided with a flow port 11 for gas and liquid to pass through. The bottom of the cavity 8 is connected to an exhaust pipe 12. When the material in the drying chamber 1 evaporates hot steam during the vacuum drying process, the steam is drawn into the cavity 8 set in the inner wall of the preheating chamber 7 by the vacuum pump 6. The inner wall of the preheating chamber 7 is made of aluminum alloy, which has good thermal conductivity and can quickly conduct the heat in the cavity 8 to the inner wall of the preheating chamber 7, thereby preheating the material to be dried inside the preheating chamber 7. When the steam flows inside the cavity 8, it will pass through four flow rings 10 fixed in the cavity 8. The inclination angle of the four flow rings 10 can be between 15° and 30°. The four flow rings 10 are arranged in pairs at an angle. Each flow ring 10 has a flow port 11 at the top, and the flow ports 11 between adjacent flow rings 10 are staggered and far away from each other, so that the flow path of the steam is forced to present a Z-shaped zigzag flow pattern. By extending the flow path, the contact area and contact time between the steam and the inner wall of cavity 8 are significantly increased, thereby enabling the release and conduction of more latent heat. The steam, after sufficient heat exchange, is finally discharged through the vent pipe 12 at the bottom of cavity 8. The uncondensed liquid, under the action of gravity, converges downward along the inner wall of cavity 8 and is guided to the vent pipe 12 by the inclined structure set at the flow ring 10 from the flow port 11 and the side near the connecting pipe 21. A storage container can be placed at one end of the vent pipe 12 to store the outflowing condensate, ensuring the efficiency and stability of the waste heat recovery process. Through the above design, the latent heat that was originally directly discharged to the outside is fully utilized, realizing the preheating of materials and greatly improving the thermal energy utilization rate.

[0022] Further, see attached document. Figure 3 and Figure 5 As shown, the temperature equalization mechanism includes a lifting cylinder 13 fixedly connected to the bottom of the inner wall of the preheating box 7. Material inlets 14 for material flow are provided on both the top and bottom sides of the lifting cylinder 13. A screw rod 15 for lifting material to the top of the lifting cylinder 13 is rotatably connected inside the lifting cylinder 13. The shaft of the screw rod 15 passes through the outer wall of the preheating box 7 and is fixedly connected to a first conical wheel 16. A rotating rod 17 is rotatably connected to the top of the preheating box 7. A belt 18 is fitted between the output end of the servo motor 3 and the outer wall of the rotating rod 17 via a pulley. The rotating rod 17 rests against... A second conical tooth 19 is fixedly connected to one end of the preheating box 7. The second conical tooth 19 and the first conical wheel 16 mesh with each other. A diffuser plate 20 for moving materials to the inner wall of the preheating box 7 is fixedly connected to the outer wall of the lifting cylinder 13. The diffuser plate 20 is umbrella-shaped. The inner wall of the preheating box 7 is a slope structure that gradually narrows from top to bottom. When the material rolls down from the diffuser plate 20, it will contact the inner wall of the preheating box 7 due to inertia. The inner wall of the preheating box 7 is a slope structure. The material falling into the preheating box 7 will roll on the inner wall of the preheating box 7 during the process of falling under gravity. After the material to be dried enters the preheating box 7 through the feed inlet 9, it first falls into the lifting cylinder 13 fixed at the bottom of the preheating box 7. The lifting cylinder 13 is rotatably connected to a screw rod 15, which drives the rotating rod 17 through the belt 18. Then, the second conical tooth 19 meshes with the first conical wheel 16 to drive the screw rod 15 to rotate continuously, lifting the material to the top of the lifting cylinder 13. The material overflows from the material outlet 14 at the top and falls onto the diffuser plate 20. The diffuser plate 20 has an umbrella-shaped structure, which can evenly disperse the material and guide the material to move towards the inner wall of the preheating box 7. Because the inner wall of the preheating box 7 is designed as a sloping structure that gradually tapers from top to bottom, the material will fully contact the inner wall due to inertia during the rolling process, and roll down along the inner wall under the action of gravity, maximizing the absorption of heat transferred to the inner wall through the waste heat recovery mechanism. The material achieves multiple contacts and uniform heating during continuous movement, avoiding local insufficient heating. After preheating, the material gradually gathers at the bottom of the preheating box 7 in a conical concentrated area during its descent. A valve is installed inside the connecting pipe 21. By opening the valve inside the connecting pipe 21 that connects to the drying box 1, it is ensured that the material before entering the drying box 1 has been fully and evenly preheated, which improves the subsequent drying efficiency and reduces energy consumption.

[0023] Further, see attached document. Figure 3 As shown, the bottom of the preheating box 7 has a conical shape for material to be concentrated at the connecting pipe 21; By designing the bottom of the preheating chamber 7 as a conical structure, the preheated material gradually concentrates and converges at the connecting pipe 21 under the influence of gravity during its descent, ensuring smooth entry of the material into the drying chamber 1. This structure not only prevents material accumulation or stagnation at the bottom of the preheating chamber 7 but also improves the smoothness and continuity of material conveying, ensuring good uniformity and stability of the material entering the drying chamber 1, which helps to improve the efficiency and reliability of subsequent drying processes.

[0024] Further, see attached document. Figure 3 As shown, the bottom of the cavity 8 is provided with an inclined structure towards the air outlet pipe 12 near the outer wall of the connecting pipe 21; A sloping structure is provided at the bottom of cavity 8 and on the side near connecting pipe 21, so that the condensate formed during the condensation process can be naturally guided to the outlet pipe 12 under the action of gravity and discharged with the steam. This design avoids the problem of flow channel blockage or reduced heat exchange efficiency caused by condensate accumulation inside cavity 8, ensuring the stability and continuity of the waste heat recovery process, thereby improving the full utilization of steam waste heat and the overall heat exchange effect of cavity 8.

[0025] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0026] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A vacuum drying device with a waste heat recovery channel, comprising a drying chamber (1), wherein the side wall of the drying chamber (1) is provided with a door (2) for material handling, and the interior of the drying chamber (1) is provided with a heating rod (5) for heating the material, characterized in that: A servo motor (3) is fixedly connected to the side wall of the drying chamber (1). A stirring rod (4) is rotatably connected between the inner walls of the drying chamber (1). One end of the stirring rod (4) passes through the outer wall of the drying chamber (1) and is fixedly connected to the output end of the servo motor (3). A vacuum pump (6) is fixedly connected to the top of the drying chamber (1). A preheating box (7) is fixedly connected to the side wall of the top of the drying chamber (1) near the vacuum pump (6). A connecting pipe (21) is connected to the bottom of the preheating box (7). The connecting pipe (21) is connected to the interior of the drying chamber (1). The input end of the vacuum pump (6) is connected to the interior of the drying chamber (1). The interior of the preheating box (7) is equipped with a waste heat recovery mechanism for recovering waste heat and heating the material to be dried. The interior of the preheating box (7) is equipped with a temperature equalization mechanism for fully heating the material.

2. The vacuum drying equipment with a waste heat recovery channel according to claim 1, characterized in that, The waste heat recovery mechanism includes a cavity (8) opened in the inner wall of the preheating box (7). The output end of the vacuum pump (6) is connected to the inside of the cavity (8). The top of the preheating box (7) is connected to a feed inlet (9) for feeding. Four flow rings (10) are fixedly connected inside the cavity (8). The four flow rings (10) are arranged in pairs at an inclination. The top of each of the four flow rings (10) on the side inclined towards the inner wall of the cavity (8) is provided with a flow port (11) for gas and liquid to pass through. The bottom of the cavity (8) is connected to an exhaust pipe (12).

3. A vacuum drying device with a waste heat recovery channel according to claim 2, characterized in that, The temperature equalization mechanism includes a lifting cylinder (13) fixedly connected to the bottom of the inner wall of the preheating box (7). The top and bottom sides of the lifting cylinder (13) are provided with material inlets (14) for material flow. The inside of the lifting cylinder (13) is rotatably connected to a screw rod (15) for lifting material to the top of the lifting cylinder (13). The shaft of the screw rod (15) passes through the outer wall of the preheating box (7) and is fixedly connected to a first conical wheel (16). The top of the preheating box (7) is rotatably connected to a rotating rod (17). A belt (18) is provided between the output end of the servo motor (3) and the outer wall of the rotating rod (17) through a pulley. The end of the rotating rod (17) near the preheating box (7) is fixedly connected to a second conical tooth (19). The second conical tooth (19) and the first conical wheel (16) mesh with each other.

4. The vacuum drying equipment with a waste heat recovery channel according to claim 3, characterized in that, The outer wall of the lifting cylinder (13) is fixedly connected to a diffuser plate (20) for moving materials to the inner wall of the preheating box (7). The diffuser plate (20) is umbrella-shaped.

5. A vacuum drying device with a waste heat recovery channel according to claim 4, characterized in that, The inner wall of the preheating box (7) has a slope structure that gradually narrows from top to bottom. When the material rolls down from the diffuser plate (20), it will come into contact with the inner wall of the preheating box (7) due to inertia. The inner wall of the preheating box (7) has a slope structure. The material falling into the preheating box (7) will roll on the inner wall of the preheating box (7) during the process of falling under gravity.

6. A vacuum drying device with a waste heat recovery channel according to claim 5, characterized in that, The bottom of the preheating box (7) is a conical structure for material to be concentrated at the connecting pipe (21).

7. A vacuum drying device with a waste heat recovery channel according to claim 6, characterized in that, The bottom of the cavity (8) near the outer wall of the connecting pipe (21) is provided with an inclined structure towards the air outlet pipe (12).

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