A blowing mechanism for a drying cabinet

Abstract

The utility model provides a kind of air supply mechanism for drying box, comprising: fan main body, air inlet cover, first steam heater, second steam heater, steam boiler, the fan main body lower part is connected with ground by support frame, the air inlet cover is installed in the air inlet side of fan main body, the first steam heater is installed in the air outlet of fan main body, and first steam heater is connected with drying box by air supply pipe;The drying box is also connected with air inlet cover by return air pipe.The utility model is by setting steam heater in the air inlet side and air outlet side of fan main body, steam generated by biomass waste produced in food processing process can heat air by steam heater, realize the drying of food, and the application is heated by the heat energy generated by biomass waste combustion in boiler, reduce power consumption, and part of biomass waste can be treated, avoid energy waste.

Description

Technical Field

[0001] This utility model relates to the field of food processing equipment technology, and in particular to an air supply mechanism for a drying oven. Background Technology

[0002] When processing nuts such as peanuts, pistachios, and macadamia nuts, after marinating, they need to be dried in a drying oven to reduce their moisture content. Current drying ovens mainly generate circulating airflow through a blower mechanism and heat the air through an electric heater or heat pump. This causes the air and nuts inside the drying oven to gradually heat up, accelerating the evaporation of moisture and thus reducing the moisture content. For example, the stable airflow heat pump dryer disclosed in Chinese Patent Application No. 202420963303.2 relates to the field of heat pump dryer technology. It includes a drying oven and a heat pump. An air outlet pipe is fixedly installed at the output end of the heat pump. Several racks are fixedly installed inside the drying oven. A door is movably connected inside the drying oven. The blower mechanism includes a mounting frame, a connecting pipe, an air guide, and a mounting column. Existing air supply mechanisms, whether using electric heaters or heat pumps, all rely on electricity as their energy source. However, nut processing enterprises generate a large amount of biomass waste such as nut shells, waste fruits, and spice residue during the nut processing process. Directly discarding these wastes not only pollutes the environment but also wastes resources. These biomass wastes can be burned in existing boilers to generate steam. Therefore, it is necessary to design an air supply mechanism for drying boxes that can use steam to heat the air, thereby drying the food, reducing electricity consumption, processing some of the biomass waste, and avoiding energy waste. Utility Model Content

[0003] To address the aforementioned issues, this invention proposes an air supply mechanism for a drying oven, which utilizes steam to heat air, thereby drying food, reducing energy consumption, and processing some biomass waste to avoid energy waste.

[0004] This utility model is achieved through the following technical solution:

[0005] This utility model proposes an air supply mechanism for a drying oven, comprising: a fan body, an air inlet mask, a first steam heater, a second steam heater, and a steam boiler. The lower part of the fan body is connected to the ground via a support frame. The air inlet mask is installed on the air inlet side of the fan body. The first steam heater is installed at the air outlet of the fan body and is connected to the drying oven via an air supply pipe. The drying oven is also connected to the air inlet mask via a return air pipe. The second steam heater is installed on the ground and is connected to the air inlet mask via an air inlet pipe. The first and second steam heaters are connected to the steam boiler via steam pipes and are connected in parallel.

[0006] Furthermore, the first steam heater and the second steam heater are provided with multiple finned tubes in the middle, and the finned tubes are installed at intervals in the middle of the first steam heater and the second steam heater, with both ends of the finned tubes connected to steam pipes respectively.

[0007] Furthermore, the finned tube is provided with fins on both sides, the fins are fixedly connected to the finned tube, and the fins have an angle of 30° to 60° with the airflow direction.

[0008] Furthermore, the return air duct and the inlet air duct are respectively provided with gates, and the return air duct and the inlet air duct are respectively provided with slots. The gates are installed horizontally in the return air duct and the inlet air duct through the slots.

[0009] Furthermore, the steam pipe is equipped with multiple steam valves.

[0010] Furthermore, the main body of the fan is a centrifugal fan, and the fan body is equipped with a fan wheel. A motor is installed on the support frame, and the motor is connected to the fan wheel through a belt and a pulley.

[0011] Furthermore, a dust filter is provided on one side of the second steam heater.

[0012] The beneficial effects of this utility model are as follows: By setting steam heaters on the air inlet and air outlet sides of the blower body, the steam generated by burning biomass waste generated during food processing in the boiler can heat the air through the steam heaters to dry the food. In addition, this application uses the heat energy generated by burning biomass waste in the boiler for heating, which reduces the consumption of electricity and can process part of the biomass waste, thus avoiding energy waste. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram showing the connection between the first steam heater and the second steam heater of this utility model;

[0015] Figure 3 This is a schematic diagram showing the connection between the motor and the main body of the fan in this utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the first steam heater of this utility model;

[0017] Figure 5 This is a schematic diagram of the installation of the dust filter of this utility model;

[0018] In the diagram: 1-fan body, 2-air inlet mask, 3-first steam heater, 4-second steam heater, 5-support frame, 6-air supply pipe, 7-return air pipe, 8-air inlet pipe, 9-steam pipe, 10-finned tube, 11-gate, 12-steam valve, 13-motor, 14-dust filter. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Throughout the description, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include at least one of the stated features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0022] like Figures 1 to 5 As shown, one embodiment of this utility model provides an air supply mechanism for a drying oven, including: a fan body 1, an air inlet mask 2, a first steam heater 3, a second steam heater 4, and a steam boiler. The lower part of the fan body 1 is connected to the ground through a support frame 5. The air inlet mask 2 is installed on the air inlet side of the fan body 1. The first steam heater 3 is installed at the air outlet of the fan body 1 and is connected to the drying oven through an air supply pipe 6. The drying oven is also connected to the air inlet mask 2 through a return air pipe 7. The second steam heater 4 is installed on the ground and is connected to the air inlet mask 2 through an air inlet pipe 8. The first steam heater 3 and the second steam heater 4 are connected to the steam boiler through a steam pipe 9 and are connected in parallel.

[0023] The steam boiler uses commercially available biomass boilers. These boilers can use purchased biomass pellets as fuel, or they can use biomass waste from the production process. During the processing of foods such as peanuts and macadamia nuts, biomass waste such as shells, waste nuts, and spice residues are generated. After being crushed, these wastes can be used as fuel. The steam generated by burning the biomass waste is sent to the first steam heater 3 and the second steam heater 4 through the air inlet pipe 8. The air is heated through the finned tube 10. After the hot air enters the drying chamber, it heats the food to be dried inside the chamber, accelerating the evaporation of moisture.

[0024] In the initial drying stage, due to the high moisture content of the food, "external circulation" air supply is usually used, which means drawing air from the outside and sending it into the drying chamber. During "external circulation" air supply, the damper 11 on the air inlet pipe 8 is opened, while the damper 11 on the return air pipe 7 is closed, and the exhaust plate at the top of the drying chamber is opened. At this time, the airflow enters the air inlet pipe 8 through the second steam heater 4, and then passes through the fan body 1, the first steam heater 3, and the air supply pipe 6 in sequence before being sent into the drying chamber. After drying is completed, the air carrying water vapor is discharged into the atmosphere from the top of the drying chamber. In the "external circulation" air supply mode, since the air is drawn in from the outside, the temperature of the drawn air is low. In order to quickly increase the air temperature, steam is introduced into both the first steam heater 3 and the second steam heater 4. The air is heated twice by the first steam heater 3 and the second steam heater 4, so that the air can still be heated to a high temperature in the "external circulation" air supply mode. After drying for a period of time, most of the moisture on the surface of the nuts has evaporated. At this point, it is still necessary to maintain a certain temperature so that the moisture in the center of the nuts can continue to evaporate. To reduce energy consumption, an "internal circulation" air supply can be used. That is, the fan draws the hot air from the drying chamber back through the return air pipe 7, heats it, and then sends it back into the drying chamber. During the "internal circulation" air supply, the damper 11 on the inlet air pipe 8 is closed, the damper 11 on the return air pipe 7 is opened, the exhaust plate at the top of the drying chamber is opened, and the steam valve 12 of the second steam heater 4 is closed. At this time, the hot air in the drying chamber enters the fan body 1 through the return air pipe 7, is heated by the first steam heater 3, and is then sent back into the drying chamber, realizing the circulation of airflow and ensuring that the nuts are heated evenly. The heat loss of the "internal circulation" air supply mode is relatively low. At this time, only the air needs to be heated by the first steam heater 3, and the steam flow of the first steam heater 3 can be adjusted by the steam valve 12 to regulate the drying temperature.

[0025] In a specific embodiment, such as Figure 4As shown, the first steam heater 3 and the second steam heater 4 are provided with multiple finned tubes 10 in the middle. The finned tubes 10 are installed at intervals in the middle of the first steam heater 3 and the second steam heater 4. The two ends of the finned tubes 10 are respectively connected to the steam pipes 9. When the steam flows through the finned tubes 10, it can heat the finned tubes 10, causing the temperature of the finned tubes 10 to rise. The finned tubes 10 have a large contact area with the air, thereby heating the air. After the air becomes hot, it is sent into the drying oven for drying.

[0026] Specifically, fins are provided on both sides of the finned tube 10. The fins are fixedly connected to the finned tube 10, and the fins have an angle of 30° to 60° with the airflow direction. By disturbing the airflow through the fins, the probability of contact between the airflow and the fins is increased, thereby improving the heating efficiency of the steam heater on the air.

[0027] In a specific embodiment, such as Figure 1 As shown, a damper 11 is provided on the return air duct 7 and the inlet air duct 8 respectively. A slot is provided in the return air duct 7 and the inlet air duct 8 respectively. The damper 11 is installed horizontally in the return air duct 7 and the inlet air duct 8 through the slot. The damper 11 can open or close the return air duct 7 and the inlet air duct 8, which facilitates switching between the "external circulation" and "internal circulation" air supply modes.

[0028] In a preferred embodiment, the steam pipe 9 is provided with a plurality of steam valves 12, which can adjust the steam flow rate and can also close the steam pipe 9 to control the start-up and shutdown of the steam heater and the temperature.

[0029] In a specific embodiment, such as Figure 3 As shown, the main body 1 of the fan is a centrifugal fan. The fan body 1 is equipped with a fan wheel, and the support frame 5 is equipped with a motor 13. The motor 13 is connected to the fan wheel through a belt and a pulley. After the fan wheel is driven to rotate by the motor 13, the airflow is drawn in from the air inlet and then sent out from the air outlet, realizing the circulation of airflow and making the food in the drying oven evenly heated.

[0030] Specifically, such as Figure 5 As shown, a dust filter 14 is provided on one side of the second steam heater 4. The second steam heater 4 is relatively heavy. In order to prevent the air inlet mask 2 from being deformed, the dust filter 14 is placed on the ground. Since there is a lot of dust on the ground, the dust filter 14 is set on the second steam heater 4 to filter dust when the air is drawn in, so as to ensure the hygiene and safety of the food in the drying oven.

[0031] Of course, there may be other implementations of this utility model. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model.

Claims

1. An air supply mechanism for a drying oven, characterized in that, include: The fan body (1), air inlet mask (2), first steam heater (3), second steam heater (4), and steam boiler are provided. The lower part of the fan body (1) is connected to the ground through a support frame (5). The air inlet mask (2) is installed on the air inlet side of the fan body (1). The first steam heater (3) is installed at the air outlet of the fan body (1) and is connected to the drying box through an air supply pipe (6). The drying box is also connected to the air inlet mask (2) through a return air pipe (7). The second steam heater (4) is installed on the ground and is connected to the air inlet mask (2) through an air inlet pipe (8). The first steam heater (3) and the second steam heater (4) are connected to the steam boiler through a steam pipe (9) and are connected in parallel.

2. The air supply mechanism for a drying oven according to claim 1, characterized in that, The first steam heater (3) and the second steam heater (4) are provided with multiple finned tubes (10) in the middle. The finned tubes (10) are installed at intervals in the middle of the first steam heater (3) and the second steam heater (4). The two ends of the finned tubes (10) are respectively connected to the steam pipe (9).

3. The air supply mechanism for a drying oven according to claim 2, characterized in that, The finned tube (10) has fins on both sides, the fins are fixedly connected to the finned tube (10), and the fins have an angle of 30° to 60° with the airflow direction.

4. The air supply mechanism for a drying oven according to claim 1, characterized in that, The return air duct (7) and the inlet air duct (8) are respectively provided with gates (11), and the return air duct (7) and the inlet air duct (8) are respectively provided with slots. The gates (11) are installed horizontally in the return air duct (7) and the inlet air duct (8) through the slots.

5. The air supply mechanism for a drying oven according to claim 1, characterized in that, The steam pipe (9) is equipped with multiple steam valves (12).

6. The air supply mechanism for a drying oven according to claim 1, characterized in that, The main body (1) of the fan is a centrifugal fan. The fan body (1) is equipped with a fan wheel, and the support frame (5) is equipped with a motor (13). The motor (13) is connected to the fan wheel through a belt and a pulley.

7. The air supply mechanism for a drying oven according to claim 1, characterized in that, A dust filter (14) is provided on one side of the second steam heater (4).

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