A paper archival material uniform temperature drying system

Abstract

This invention provides a uniform temperature drying system. The drying component includes a housing with an internal cavity. A drying chamber is disposed within the cavity, and the drying chamber has a shell containing a cavity. A gap exists between the inner wall of the cavity and the shell, forming a hot air channel. The shell is a heat conductor. The hot air inlet of the drying component is located at the rear. Hot air enters the cavity from the front of the drying chamber and exits from the lower outlet, circulating back to the hot air component via a return air duct. Gaps exist between the upper, lower, side, and rear portions of the inner wall of the cavity and the drying chamber, immersing the drying chamber in hot air. This invention ensures uniform temperature distribution across the cavity within the shell, achieving overall uniform heating and drying, and avoiding uneven heating problems.

Description

Technical Field

[0001] This invention relates to a drying system, and more particularly to a uniform temperature drying system. Background Technology

[0002] Drying equipment, also known as dryers or dryers, is used for drying operations. It uses heat to vaporize and remove moisture (generally water or other volatile liquid components) from materials, resulting in solid materials with a specified moisture content. The purpose of drying is to meet the needs of material use or further processing. For example, drying wood before making molds or woodenware prevents deformation, and drying ceramic blanks before firing prevents cracking. Additionally, dried materials are easier to transport and store; for instance, drying harvested grain to a certain moisture content prevents mold growth. Because natural drying is far from meeting the needs of production development, various mechanized dryers are increasingly widely used.

[0003] Box-type drying equipment is one of the earliest types of drying equipment. It has a relatively simple structure, offers a degree of flexibility, and has a wide range of applications. Its drying channels are short and wide, with internal temperature differences typically within 10°C, overcoming the shortcomings of other drying equipment such as large temperature differences and low drying flexibility. However, due to its larger width and height, box-type drying equipment suffers from poor uniformity of hot air distribution in all directions. Products closer to the drying inlet receive more heat, potentially leading to overheating, while products farther from the inlet may fail to meet drying standards due to insufficient heat.

[0004] CN108800801A discloses a heat pump hot air circulation intelligent drying oven, including an enclosure structure, an air supply duct, an air supply static pressure layer, a drying area, a return air static pressure layer, a heat pump drying system connected to the enclosure structure, a heat pump air supply duct, a heat pump return air duct, an exhaust air duct, a mode conversion switch, and an electric heating controller, all connected to the enclosure structure and the heat pump drying system. This invention employs a drying mode combining heat pump and electric heating, which can be freely switched and automatically integrated with intelligent control. It uses an energy recovery type exhaust port to increase the heat pump evaporation temperature to improve energy efficiency, and a parallel adjustable cross-section air supply method to improve airflow organization in the drying area, ensuring uniform and stable airflow, thus improving drying efficiency and reducing energy consumption.

[0005] However, the aforementioned structure is complex and does not achieve the corresponding temperature uniformity. This invention improves upon this by ensuring that the temperature of the drying oven is essentially the same across its entire structure, from front to back, left to right, top to bottom, thus achieving overall temperature balance and improving drying quality and efficiency. Summary of the Invention

[0006] In order to overcome the defects and shortcomings of the existing technology, the present invention provides a new type of drying system that makes the temperature of the drying chamber basically the same in all directions, thereby achieving a uniform drying temperature and improving drying quality and efficiency.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A uniform temperature drying system includes a hot air component and a drying component. The hot air component generates hot air, which enters the drying component through an air supply duct. The drying component includes a housing with an internal cavity. A drying chamber is disposed within the cavity. The drying chamber has a shell with an internal cavity. A gap exists between the inner wall of the cavity and the shell, forming a hot air channel. The shell is a heat conductor. The hot air inlet of the drying component is located at the rear of the drying component. Hot air enters the cavity from the front of the drying chamber and then flows out from the lower outlet of the drying chamber, circulating back to the hot air component through a return air duct. The upper, lower, side, and rear portions of the inner wall of the cavity are all spaced from the drying chamber, thereby immersing the drying chamber in hot air.

[0009] As an improvement, multiple horizontal plates are arranged vertically inside the drying chamber, and the material to be dried is placed on the horizontal plates.

[0010] As an improvement, the horizontal plate extends forward from the rear wall of the cavity.

[0011] As an improvement, the material to be dried is placed on the lower wall of the drying chamber.

[0012] As an improvement, the material that needs to be dried is paper.

[0013] As an improvement, the casing is at least one of copper, aluminum, and iron, or at least one of a copper, aluminum, and iron alloy.

[0014] As an improvement, the lower outlet of the hot air is located at the rear of the drying chamber housing.

[0015] As an improvement, a bypass pipe is provided in the return air duct to connect with the supply air duct. A first valve is provided in the bypass pipe, and a second valve is provided in the return air duct between the bypass pipe and the hot air component. By adjusting the opening and closing of the first valve and the second valve and the size of the opening, the air flow of the bypass pipe is adjusted, thereby adjusting the temperature of the hot air entering the drying component.

[0016] As an improvement, when the detected temperature of the hot air entering the drying component is higher than the set value, the opening of the first valve is increased and the opening of the second valve is decreased.

[0017] As an improvement, when the detected temperature of the hot air entering the drying component is lower than the set value, the opening of the first valve is reduced and the opening of the second valve is increased.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] This invention uses a heat-conducting shell, with gaps between the upper, lower, side, and rear parts of the inner wall of the cavity and the drying chamber. This allows the drying chamber to be immersed in hot air. Heat is conducted through the shell to the upper, lower, left, and right parts of the cavity near the inner wall, while other parts of the chamber transfer temperature through the convection of hot air. This ensures that the temperature is evenly distributed throughout the cavity, achieving uniform heating and drying and avoiding uneven heating. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the uniform temperature drying system of the present invention;

[0021] Figure 2 This is a schematic diagram of another embodiment of the uniform temperature drying system of the present invention;

[0022] Figure 3 This is a schematic diagram of the airflow process of the present invention. Detailed Implementation

[0023] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] Unless otherwise specified, the terms "before" and "after" in this application specification refer to... Figure 1 The left and right directions, that is Figure 1 In the middle, the air inlet of the chamber 25 of the shell is "front", and the corresponding position is "rear".

[0025] Figure 1-2 The uniform temperature drying system of the present invention is demonstrated. For example... Figure 1 As shown, a uniform temperature drying system includes a hot air component 1 and a drying component 2. The hot air component 1 generates hot air 2, which enters the drying component 2 through an air supply duct 3. The drying component includes a housing 21 with an internal cavity 22. A drying chamber 23 is disposed within the cavity, and the drying chamber 23 has a shell 24 with a cavity 25 inside. There is a gap between the inner wall of the cavity and the shell of the drying chamber, thus forming a hot air channel. The shell is a heat conductor. The hot air inlet 27 of the drying component 2 is located at the rear of the drying component. Hot air enters the cavity from the front of the drying chamber and then flows out from the lower outlet 28 of the drying chamber, circulating back to the hot air component through a return air duct 4. The upper, lower, side, and rear parts of the inner wall of the cavity are all separated from the drying chamber, thus immersing the drying chamber in hot air.

[0026] Hot air flows from the hot air inlet 27 into the rear compartment, then from the rear into the upper and lower side compartments, and then into the cavity at the front of the drying chamber. After drying, it flows out from the outlet 28. This invention, by setting a drying chamber with a cavity within the chamber body, allows the product to be dried to be placed inside the cavity. An air channel is formed between the drying chamber and the chamber body, and the entire exterior of the drying chamber is immersed in hot air. There are no temperature dead zones outside the drying chamber. Heat is transferred to the interior of the chamber through the thermal conductivity of the drying chamber shell, thereby ensuring uniform temperature across the upper, lower, left, and right sides of the cavity inside the shell. This achieves overall uniform heating and drying, avoiding uneven heating and further improving heating uniformity.

[0027] Because air has a low density and flows upward, this invention can further reduce the air dead zone in the cavity and improve the overall temperature uniformity by placing the hot air outlet 28 at the bottom of the drying chamber.

[0028] As an improvement, a fan can be installed to enhance airflow. The fan can be installed in the air inlet duct and / or air outlet duct.

[0029] As an improvement, the hot air inlet 27 is located at the lower center of the rear part of the drying component. Because air has a low density and tends to rise, this arrangement ensures a more even distribution of hot air vertically, improving the overall uniformity of the drying temperature.

[0030] As an improvement, multiple horizontal plates are arranged vertically within the drying chamber, on which the material to be dried is placed. Furthermore, through holes are provided on the horizontal plates to allow hot air to flow vertically. By incorporating these through holes, air can flow between adjacent horizontal plates, thereby improving drying efficiency.

[0031] The horizontal plate is a heat-conducting plate. The material of the horizontal plate is the same as the shell material. By incorporating the heat-conducting plate, heat conduction and convection heat transfer can be achieved, improving drying efficiency.

[0032] As an improvement, the horizontal plate extends forward from the rear wall of the cavity. Because the entire exterior of the drying oven is immersed in hot air, there is no temperature dead zone outside the drying oven. Heat is transferred to the interior of the oven through the thermal conductivity of the drying oven shell. Therefore, even the part of the horizontal plate closest to the shell maintains a uniform temperature, meaning the temperature of the entire horizontal plate is basically uniform.

[0033] As an improvement, the material to be dried is placed on the lower wall of the drying chamber shell. Because the entire exterior of the drying chamber is immersed in hot air, the temperature of the drying chamber shell is basically maintained at the same level as other parts of the chamber. The drying chamber shell can be used as a component for placing the material to be dried, thereby expanding the drying area and improving drying efficiency.

[0034] As an improvement, the material that needs to be dried is paper material. The improvement is in paper archival materials.

[0035] As an improvement, the casing is at least one of copper, aluminum, and iron, or at least one of a copper, aluminum, and iron alloy.

[0036] As an improvement, the lower outlet of the hot air is located at the rear of the drying chamber shell. Because air has a low density and flows upward, this design allows air to enter from the front and exit from the rear, further reducing dead zones within the chamber and improving overall temperature uniformity.

[0037] As an improvement, the spacing between the horizontal plates decreases from bottom to top. Because hot air flows upward, the upper part of the air receives more heat. This arrangement ensures more even drying across the entire space, improving drying efficiency.

[0038] As an improvement, the spacing between the horizontal plates gradually increases from bottom to top. By adjusting the spacing, the drying process can be further made more even between the upper and lower parts, thus further improving drying efficiency.

[0039] As an improvement, a guide gate 5 is provided at the hot air inlet of the cavity, and multiple holes are provided on the guide gate 5 to introduce hot air into the cavity.

[0040] As an improvement, the density of the holes on the flow guide gate decreases from bottom to top. This design allows the hot fluid to be distributed as much as possible at the bottom and then flow upward, resulting in a more uniform heat distribution and improved temperature uniformity in drying.

[0041] As an improvement, the density of the holes on the flow guide gate gradually increases from bottom to top. This design further ensures more uniform heat distribution and improves the temperature uniformity of drying.

[0042] As an improvement, a bypass pipe 6 connecting the return air duct to the supply air duct is provided. A first valve 7 is provided on the bypass pipe, and a second valve 8 is provided on the return air duct between the bypass pipe and the hot air component. By adjusting the opening and closing of the first valve and the second valve and the size of the opening, the air flow of the bypass pipe is adjusted, thereby adjusting the temperature of the hot air entering the drying component.

[0043] As an improvement, when the detected temperature of the hot air entering the drying component is higher than the set value, the opening of the first valve is increased and the opening of the second valve is decreased.

[0044] As an improvement, when the detected temperature of the hot air entering the drying component is lower than the set value, the opening of the first valve is reduced and the opening of the second valve is increased.

[0045] By adjusting the opening of the first and second valves, the preheating of the return air can be fully utilized, and the temperature of the air inside the drying component can be controlled, thereby controlling the drying temperature.

[0046] A temperature sensor is installed at the hot air inlet of the enclosure to detect the temperature of the hot air entering the enclosure 1.

[0047] As an improvement, the opening degree of the first and second valves is automatically controlled based on the temperature detected by the hot air.

[0048] The cavity of the box is provided with at least one support member for supporting the drying box.

[0049] As an improvement, the enclosure is provided with a nano-insulation layer and a lightweight heat insulation layer from the outside to the inside, thereby effectively isolating the enclosure from the outside world and preventing heat loss.

[0050] As an improvement, the housing is equipped with an openable and closable furnace door 9, which facilitates the placement and removal of dried materials.

[0051] As an improvement, the leveling plate is removable for easy replacement and maintenance.

[0052] As an improvement, the hot air component 1 can be a solar thermal collector that generates hot air.

[0053] As an improvement, the thermal conductivity of the rear wall 241 of the shell varies from bottom to top. From bottom to top, the thermal conductivity gradually decreases. Because hot air has a lower density and flows upwards, the decreasing thermal conductivity results in more heat being transferred to the upper part and less to the lower part, thus achieving a more even heat distribution and balanced drying.

[0054] As an improvement, the rate at which the thermal conductivity of the rear wall 241 of the shell gradually decreases from bottom to top is continuously increased. By adjusting this rate, heat balance can be further achieved, resulting in more even drying.

[0055] While the present invention has been disclosed above with reference to preferred embodiments, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A paper archival material uniform temperature drying system, the system comprising a hot air section and a drying section, the hot air section generating hot air, the hot air entering the drying section through a supply air duct, the drying section comprising a cabinet, the cabinet having a cabinet cavity inside, a drying cabinet being arranged in the cabinet cavity, the drying cabinet having a shell, the shell having a cavity inside, a space being formed between the inner wall of the cabinet cavity and the shell of the drying cabinet, thereby forming a hot air passage, the shell being a heat conducting body, the hot air inlet of the drying section being located at the rear of the drying section, the hot air entering the cavity from the front of the drying cabinet, then flowing out from the lower outlet of the drying cabinet, and then circulating back to the hot air section through a return air duct; the upper part, lower part, side part and rear part of the inner wall of the cabinet cavity being spaced apart from the drying cabinet, thereby allowing the drying cabinet to be immersed in the hot air; a plurality of horizontal plates being arranged in the cavity of the drying cabinet in the up-down direction, the horizontal plates being used to place the materials to be dried; the lower wall of the shell of the drying cabinet being used to place the materials to be dried; the materials to be dried being paper archival materials; the hot air flowing from the hot air inlet to the space at the rear, then entering the space at the rear, then entering the space at the upper and lower sides, and then entering the cavity from the front of the drying cabinet, and then flowing out from the lower outlet after drying; the space of the horizontal plates becoming smaller and smaller along the height direction from bottom to top.

2. The drying system of claim 1, wherein, The horizontal plates extend forward from the rear wall of the cavity.

3. The drying system of claim 1, wherein, The shell is at least one of copper, aluminum and iron.

4. The drying system of claim 1, wherein, The lower outlet of the hot air is located at the rear of the shell of the drying cabinet.

5. The drying system of claim 1, wherein, The horizontal plates are heat conducting plates, and the material of the horizontal plates is the same as that of the shell.

6. The drying system of claim 1, wherein, The hot air inlet is arranged at a position lower than the middle of the rear of the drying section.

7. The drying system of claim 1, wherein, Through holes are arranged on the horizontal plates, and the hot air flows up and down through the through holes.

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