A heat source built-in grain dryer

Abstract

The application discloses a heat source built-in grain dryer and belongs to the technical field of grain dryers, which comprises a dryer main body, a lifting mechanism, a drying and heating system, a moisture detector, an air draught fan and an automatic control system, the lifting mechanism is vertically arranged on one side of the dryer main body, the dryer main body is a combined structure of layers of stacking, from bottom to top, is sequentially provided with a grain discharging bin, a drying bin, a buffer bin and a top bin, a three-way flow divider is arranged at the top discharge port of the lifting mechanism, the two side outlets at the bottom end of the three-way flow divider are respectively provided with a feeding chute and a discharge pipe, and the moisture detector is arranged at the bottom feeding port of the lifting mechanism. The above-mentioned heat source built-in grain dryer has the advantages of zero emission, no pollution, small investment, low cost, safety and reliability, high drying efficiency, automatic control precision, low energy consumption, high thermal efficiency and remarkable energy-saving effect.

Description

Technical Field

[0001] This invention relates to the field of grain dryer technology, and in particular to a grain dryer with a built-in heat source. Background Technology

[0002] Current grain drying technologies rely on burning non-renewable energy sources such as coal and oil / gas. The hot air generated from this combustion is drawn into the drying chamber by a fan, where the grain is heated and dried. While this technology meets the needs of grain drying, it has several drawbacks. Firstly, the use of coal, oil, or gas as the combustion medium depletes non-renewable energy sources and generates severe environmental pollution from exhaust gases and residues, damaging the natural ecosystem. Secondly, this drying medium can easily contaminate the grain, especially when burning fuel oil, posing a risk to food safety. Thirdly, the high cost of the combustion medium results in relatively high drying costs. Furthermore, burning coal requires a large furnace next to the dryer, and hot air must be delivered through long pipes, leading to significant heat loss, low thermal efficiency, and a large footprint, increasing the investment cost of the drying plant.

[0003] With the rapid development of science and technology, protecting the ecological environment has become an important indicator of technological development. The rational use of energy can reduce environmental pollution and save costs. Nowadays, the earth's energy resources are becoming increasingly scarce. Therefore, developing and utilizing new energy sources is necessary to meet the needs of modern technological development. Currently, in response to the aforementioned technical shortcomings, grain dryers using heat pump-type hot air energy technology have been developed on the market, which has made some breakthroughs in reducing environmental pollution. However, this type of grain dryer is expensive, has unstable operation, insignificant temperature rise, slow drying speed, and is prone to frost formation at slightly lower ambient temperatures, forcing the heat pump to malfunction. This causes great inconvenience to grain drying, especially in rainy and humid weather, which can easily lead to mold growth due to delayed drying. Furthermore, like coal-fired dryers, this technology requires a large heat pump to be installed next to the dryer, and hot air must be delivered to the dryer through long pipelines, resulting in high heat loss, low thermal efficiency, large footprint, and a relatively large drying plant, thus increasing investment costs. Therefore, it is imperative to develop a clean energy grain dryer with high thermal efficiency, low cost, small size, reliable operation, and zero pollution emissions. Summary of the Invention

[0004] The purpose of this invention is to provide a grain dryer with a built-in heat source to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides a grain dryer with an internal heat source, comprising a dryer body, a lifting mechanism, a drying and heating system, a moisture meter, an induced draft fan, and an automatic control system. The lifting mechanism is vertically positioned on one side of the dryer body. The dryer body is a layered, modular structure, with a grain discharge chamber, a drying chamber, a tempering chamber, and a top chamber arranged sequentially from bottom to top. The top discharge port of the lifting mechanism is equipped with a three-way diverter, and the bottom two outlets of the three-way diverter are respectively equipped with a feed chute and a discharge pipe. The moisture meter is located at the bottom feed port of the lifting mechanism.

[0006] Preferably, an impeller discharge mechanism is provided above the grain discharge bin in a direction perpendicular to the lifting mechanism, and an inverted V-shaped grain flow plate is provided on both sides parallel to the impeller discharge mechanism; a spiral auger discharge mechanism is provided at the bottom of the inverted V-shaped grain flow plate, and an auger discharge port is provided at the front end of the spiral auger discharge mechanism, which is connected to the bottom feed port of the lifting mechanism.

[0007] Preferably, the drying chamber is provided with at least two sets of inlet and outlet corner box layers. The side of the inlet and outlet corner box layer near the lifting mechanism is provided with a hot air chamber, and the side of the inlet and outlet corner box layer away from the lifting mechanism is provided with an exhaust chamber. The automatic control system is located below the outer side wall of the hot air chamber away from the lifting mechanism. The exhaust chamber is connected to the induced draft fan below the rear side wall.

[0008] Preferably, the slow-release bin has several layers, the top bin is equipped with a distributor, the top outer perimeter is surrounded by a top fence, a dust removal system connected to the feed chute is located in the center, and a full grain detector and a top inspection port are provided on the top plate.

[0009] Preferably, each group of air inlet and outlet corner box layers has corner boxes arranged alternately on both sides where the hot air chamber and the exhaust chamber are installed; the corner box has a pentagonal cross-section, a hollow bottom surface, and a 60º apex angle; the corner box is a double-layer six-channel corner box.

[0010] Preferably, the distributor is a non-powered, self-rotating, cone-shaped grain distributor located directly below the feed chute outlet.

[0011] Preferably, the drying and heating system is an electric heating heat source system, vertically positioned at the bottom of the hot air chamber, and includes a support, a housing, and electrical controls. The housing is positioned above the support and has a jacketed structure. The housing contains a heating chamber and a temperature control chamber. The heating chamber has a hot air outlet and a cold air inlet at its top and bottom, respectively. The electrical controls are installed in the temperature control chamber. Each electric heating tube in the heating zone is controlled by the electrical controls and electrically connected to the automatic control system.

[0012] Preferably, the heating chamber has several rows and columns of electric heating tubes arranged in parallel from bottom to top; the electric heating tubes are divided into four heating zones according to the actual power of the working conditions, and each heating zone is equipped with a temperature sensor; the temperature control chamber is also equipped with the same number of temperature protectors as the electrical control devices; the temperature protectors and the temperature sensors are all electrically connected to the automatic control system.

[0013] Preferably, the electric heating tube has a W-shaped structure, including a positive electrode, a negative electrode, and an electric heating element located between the positive electrode and the negative electrode, with one end of the positive electrode and the negative electrode passing through the heating cavity and connected to the temperature control cavity.

[0014] Preferably, the bottom of the support is provided with a threaded adjustable structure; the feed chute is a gravity-type inclined feed pipe, and the angle between the gravity-type inclined feed pipe and the vertical plane is 30º~40º; a ladder connecting to the top railing is installed on the side wall of the dryer body near the automatic control system.

[0015] Therefore, the present invention employs the above-mentioned heat source built-in grain dryer, which has the following beneficial effects: (1) The drying and heating system generates clean energy by converting electrical energy into heat energy, with zero emissions and no pollution, which fully and effectively protects the natural ecological environment; it does not pollute the dried grain, ensuring the food safety of the grain; it does not require the use of other land, has a small land area, saves land investment costs, and improves land utilization.

[0016] (2) The electric heating tube is divided into four heating zones. The automatic control system controls the electric heating tubes of the four heating zones respectively through electrical controls, so as to better allocate energy utilization and significantly improve energy saving effect.

[0017] (3) It has a simple structure, small size, low cost, and no need for auxiliary facilities such as pipelines, which further reduces investment costs; it is not affected by the environment and temperature, which improves drying efficiency; it is safe and reliable, with low heat loss, high thermal efficiency, and low energy consumption, saving non-renewable energy.

[0018] (4) The control of the drying and heating system is electrically connected to the automatic control system of the dryer. When the temperature reaches the set value, the temperature of each section of the drying and heating system is converted into an electrical signal by the temperature sensor and transmitted to the automatic control system. The automatic control system sends a signal, and the electrical control sends an action command to the temperature protector to automatically protect the temperature, so as to achieve a better effect. The electromechanical integration control of the drying and heating system of the dryer is realized, with automatic detection, automatic tracking and automatic adjustment, which significantly improves the safety of the heat energy generating device and realizes the automated continuous production of the grain dryer and heating system.

[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a grain dryer with an internal heat source according to an embodiment of the present invention; Figure 2 This is a left view of a grain dryer with a built-in heat source according to an embodiment of the present invention; Figure 3 This is a top view of a grain dryer with an internal heat source according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the drying and heating system according to an embodiment of the present invention; Figure 5 This is a left view of the drying and heating system according to an embodiment of the present invention; Figure 6 This is a top view of the drying and heating system according to an embodiment of the present invention; Figure 7 This is a three-dimensional structural diagram of the drying and heating system according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the internal structure arrangement of the drying chamber according to an embodiment of the present invention; Figure Labels 1. Dryer body; 11. Grain discharge bin; 111. Impeller grain discharge mechanism; 112. Inverted V-shaped grain flow plate; 113. Spiral auger discharge mechanism; 114. Auger discharge port; 12. Drying chamber; 121. Inlet and outlet air angle box layer; 122. Hot air chamber; 123. Exhaust chamber; 124. Angle box; 13. Tempering chamber; 14. Top chamber; 141. Distributor; 142. Top railing; 143. Dust removal system; 144. Full grain detector; 145. Top inspection port; 2. Lifting 21. Mechanism; 22. Feed chute; 23. Discharge pipe; 3. Drying and heating system; 31. Support frame; 311. Threaded adjustable structure; 32. Chamber; 321. Heating chamber; 323. Temperature control chamber; 322. Hot air outlet; 324. Cold air inlet; 325. Heating zone; 33. Electric heating element; 34. Temperature sensor; 35. Temperature protector; 36. Electrical control; 4. Moisture detector; 5. Exhaust fan; 6. Automatic control system; 7. Ladder. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] Example like Figure 1-8 As shown, the present invention provides a grain dryer with a built-in heat source, including a dryer body 1, a lifting mechanism 2, a drying and heating system 3, a moisture detector 4, an induced draft fan 5, and an automatic control system 6. The lifting mechanism 2 is vertically placed on one side of the dryer body 1, and the moisture detector 4 is set at the bottom feed inlet of the lifting mechanism 2.

[0024] The dryer body 1 is a multi-layered modular structure, with a grain discharge bin 11, a drying bin 12, a tempering bin 13, and a top bin 14 arranged sequentially from bottom to top.

[0025] Above the grain discharge bin 11, in a direction perpendicular to the lifting mechanism 2, is an impeller grain discharge mechanism 111. Along the two sides parallel to the impeller grain discharge mechanism 111, there are inverted V-shaped grain flow plates 112. At the bottom of the inverted V-shaped grain flow plates 112, there is a spiral auger discharge mechanism 113. The front end of the spiral auger discharge mechanism 113 is provided with an auger discharge port 114, which is connected to the bottom feed port of the lifting mechanism 2.

[0026] The drying chamber 12 is provided with at least two sets of air inlet and outlet corner box layers 121. The side of the air inlet and outlet corner box layer 121 near the lifting mechanism 2 is provided with a hot air chamber 122, and the side of the air inlet and outlet corner box layer 121 away from the lifting mechanism 2 is provided with an exhaust chamber 123. An automatic control system 6 is provided below the outer side wall of the hot air chamber 122 away from the lifting mechanism 2. The exhaust chamber 123 is connected to the induced draft fan 5 below the rear side wall.

[0027] The automatic control system 6 is electrically connected to the moisture detector 4, temperature sensor 34, temperature protector 35, electrical control 36, and induced draft fan 5, respectively. It receives signals indicating grain moisture content, heating temperature, and equipment operating status, and, based on the detection results, performs coordinated control on / off of the electric heating element 33, the operating status of each heating zone 325, and the operating status of the induced draft fan 5. This configuration allows the automatic control system 6 to centrally regulate the drying process, making the grain drying process more stable and preventing excessively high or low temperatures from affecting the drying effect.

[0028] The slow-release bin 13 has several layers, with the number of layers depending on the loading capacity. The top bin 14 is equipped with a distributor 141, and a top fence 142 is installed around the outside of the top. A dust removal system 143 connected to the feed chute 22 is located in the center. A full grain detector 144 and a top inspection port 145 are installed on the top plate.

[0029] The dust removal system 143 corresponds to the outlet of the feed chute 22. The dust removal system 143 is used to promptly remove entrained dust and light impurities as the grain enters the top silo chamber 14 from the feed chute 22, reducing dust accumulation within the top silo chamber 14. The dust removal system 143 can be connected to external dust collection components via dust removal pipes to form an upper extraction structure, thereby maintaining relative cleanliness inside the top silo chamber 14 and reducing the adverse effects of dust on grain quality and the equipment operating environment.

[0030] Each set of inlet and outlet corner box layers 121 has corner boxes 124 arranged alternately on both sides of the hot air chamber 122 and the exhaust chamber 123, so that the hot air can fully contact the grain, the hot air guiding effect is better, the ventilation capacity is increased, the drying efficiency is improved, and the drying cost is further reduced. The corner box 124 has a pentagonal cross-section, a hollow bottom surface, and a 60º top angle. The corner box 124 is a double-layer six-channel corner box.

[0031] The distributor 141 adopts a non-powered, self-rotating conical grain distributor located directly below the feed chute outlet. It requires no power supply, reduces grain breakage rate, lowers energy consumption, and further reduces product costs.

[0032] The top discharge port of the lifting mechanism 2 is equipped with a three-way diverter 21. The bottom two outlets of the three-way diverter 21 are respectively equipped with a feed chute 22 and a discharge pipe 23. The grain is controlled by the three-way diverter 22 to enter the feed chute 22 or the discharge pipe 23.

[0033] The drying and heating system 3 is an electrically heated heat source system, vertically positioned at the bottom of the hot air chamber 122. It includes a support 31, a housing 32, electric heating tubes 33, a temperature sensor 34, a temperature protector 35, and electrical controls 36. The housing 32 is positioned above the support 31 and has a jacketed structure. Inside the housing 32 are a heating chamber 321 and a temperature control chamber 323. The heating chamber 321 has a hot air outlet 322 and a cold air inlet 324 at its top and bottom, respectively. Several rows and columns of electric heating tubes 33 are arranged parallel to each other from bottom to top inside the heating chamber 321. The electric heating tubes 33 are divided into four heating zones 325 according to their actual power output. Each heating zone 325 is equipped with a temperature sensor 34. The electrical controls 36 are installed inside the temperature control chamber 323. Each heating zone 325's electric heating tubes 33 are individually controlled by the electrical controls 36 and electrically connected to the automatic control system 6.

[0034] The temperature control chamber 323 is also equipped with the same number of temperature protectors 35 as the electrical control 36; the temperature protectors 35 and the temperature sensors 34 are all electrically connected to the automatic control system 6.

[0035] The electric heating tube 33 has a W-shaped structure, which can increase the heat dissipation area, enhance the heating effect, and improve the heating efficiency. The electric heating tube 33 includes a positive electrode, a negative electrode, and an electric heating element located between the positive electrode and the negative electrode. One end of the positive electrode and the negative electrode both pass through the heating cavity 321 and are connected to the temperature control cavity 323.

[0036] The bottom of the support frame 31 is equipped with a threaded adjustable structure 311, which facilitates installation and increases the stability of the drying and heating system. The threaded adjustable structure 311 includes a threaded sleeve fixedly connected to the bottom of the support frame 31 and an adjusting screw passing through the threaded sleeve. The lower end of the adjusting screw is connected to a support base. By rotating the adjusting screw, the support height at the bottom of the support frame 31 can be changed, thereby leveling the drying and heating system 3 and ensuring the stability of the housing 32 after installation. This structure not only facilitates installation and alignment but also improves the stability of the drying and heating system 3 during operation, reducing the impact of vibration.

[0037] The feed chute 22 adopts a gravity-type inclined feed pipe with an angle of 30º to 40º between the gravity-type inclined feed pipe and the vertical plane. It has a simple structure, low manufacturing cost, speeds up the feeding speed, effectively prevents material blockage, and has good economic benefits.

[0038] A ladder 7 connected to the top railing 142 is installed on the side wall of the dryer body 1 near the automatic control system 6. The steps on the ladder 7 are all treated with anti-slip treatment.

[0039] Therefore, the present invention adopts the above-mentioned heat source built-in grain dryer, realizing the electromechanical integration control of the drying and heating system of the dryer, automatic detection, automatic tracking and automatic adjustment, which significantly improves the safety of the heat energy generating device and realizes the automated continuous production of the grain dryer and heating system.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A grain dryer with a built-in heat source, characterized in that: The dryer includes a main body, a lifting mechanism, a drying and heating system, a moisture meter, an induced draft fan, and an automatic control system. The lifting mechanism is vertically positioned on one side of the main body. The main body is a multi-layered composite structure, consisting of a grain discharge bin, a drying bin, a tempering bin, and a top bin, arranged sequentially from bottom to top. The top discharge port of the lifting mechanism is equipped with a three-way diverter, and the bottom two outlets of the three-way diverter are respectively equipped with a feed chute and a discharge pipe. The moisture meter is located at the bottom feed port of the lifting mechanism.

2. The grain dryer with built-in heat source according to claim 1, characterized in that: Above the grain discharge bin, in a direction perpendicular to the lifting mechanism, is an impeller grain discharge mechanism. Along the two parallel sides of the impeller grain discharge mechanism, there are inverted V-shaped grain flow plates pointing downwards. At the bottom of the inverted V-shaped grain flow plates is a spiral auger discharge mechanism. The front end of the spiral auger discharge mechanism is provided with an auger discharge port, which is connected to the bottom feed port of the lifting mechanism.

3. A grain dryer with a built-in heat source according to claim 1, characterized in that: The drying chamber is provided with at least two sets of air inlet and outlet corner box layers. The side of the air inlet and outlet corner box layer closest to the lifting mechanism is provided with a hot air chamber, and the side of the air inlet and outlet corner box layer away from the lifting mechanism is provided with an exhaust chamber. The automatic control system is located below the outer side wall of the hot air chamber away from the lifting mechanism. The exhaust chamber is connected to the induced draft fan below the rear side wall.

4. A grain dryer with a built-in heat source according to claim 1, characterized in that: The slow-release bin has several layers. The top bin is equipped with a distributor. The top outer side is surrounded by a top fence. A dust removal system connected to the feed chute is located in the center. A full grain detector and a top inspection port are provided on the top plate.

5. A grain dryer with a built-in heat source according to claim 3, characterized in that: Each set of air inlet and outlet corner box layers has corner boxes arranged alternately on both sides where the hot air chamber and the exhaust chamber are installed; the corner box has a pentagonal cross-section, a hollow bottom surface, and a 60º apex angle; the corner box is a double-layer six-channel corner box.

6. A grain dryer with a built-in heat source according to claim 4, characterized in that: The distributor is a non-powered, self-rotating, cone-shaped grain distributor located directly below the feed chute outlet.

7. A grain dryer with a built-in heat source according to claim 1, characterized in that: The drying and heating system is an electric heating heat source system, vertically positioned at the bottom of the hot air chamber, and includes a support, a housing, and electrical controls. The housing is located above the support and has a jacketed structure. The housing contains a heating chamber and a temperature control chamber. The heating chamber has a hot air outlet and a cold air inlet at its top and bottom, respectively. The electrical controls are installed in the temperature control chamber. Each electric heating tube in the heating zone is controlled by the electrical controls and electrically connected to the automatic control system.

8. A grain dryer with a built-in heat source according to claim 7, characterized in that: The heating chamber contains several rows and columns of electric heating tubes arranged in parallel from bottom to top. The electric heating tubes are divided into four heating zones according to their actual power output, and each heating zone is equipped with a temperature sensor. The temperature control chamber also contains the same number of temperature protectors as the electrical control unit. The temperature protectors and the temperature sensors are electrically connected to the automatic control system.

9. A grain dryer with a built-in heat source according to claim 8, characterized in that: The electric heating tube has a W-shaped structure, including a positive electrode, a negative electrode, and an electric heating element located between the positive electrode and the negative electrode. One end of the positive electrode and the negative electrode both pass through the heating cavity and are connected to the temperature control cavity.

10. A grain dryer with a built-in heat source according to claim 1, characterized in that: The bottom of the support frame is equipped with a threaded adjustable structure; the feed chute is a gravity-type inclined feed pipe with an angle of 30º to 40º between the gravity-type inclined feed pipe and the vertical plane; a ladder connecting to the top railing is installed on the side wall of the dryer body near the automatic control system.

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