Uniform-temperature drying system

Abstract

The invention provides a uniform-temperature drying system which is characterized in that a drying part comprises a box body, and a box body cavity is formed in the box body; a drying box is arranged in the box body cavity and provided with a shell, a cavity is formed in the shell, a gap is formed between the inner wall of the box body cavity and the shell of the drying box, so that a hot air channel is formed, the shell is a heat conductor, a hot air inlet of the drying component is located in the rear portion of the drying component, and hot air enters the cavity from the front portion of the drying box. The air flows out from a lower outlet of the drying box and circularly returns to the hot air component through an air return pipeline; gaps are formed between the upper part, the lower part, the side part and the rear part of the inner wall of the cavity of the box body and the drying box, so that the drying box is immersed in hot air. The temperature of the upper, lower, left and right positions of the cavity in the shell can be balanced, overall balanced heating and drying are achieved, and the problem of uneven heating is avoided.

Description

Technical Field

[0001] The present invention relates to a drying system, and more particularly to a temperature-uniform drying system. Background Art

[0002] Drying equipment is also known as a dryer and a drying machine. It is a device used for drying operations. By heating, the moisture content (generally referring to water or other volatile liquid components) in the material is vaporized and escaped to obtain solid materials with a specified moisture content. The purpose of drying is for the needs of material use or further processing. For example, drying wood before making wooden molds and wooden utensils can prevent the products from deforming, and drying ceramic blanks before calcination can prevent the finished products from cracking. In addition, the dried materials are also convenient for transportation and storage. For example, harvesting grains are dried to a certain moisture content or below to prevent mildew. Since natural drying far from meets the needs of production development, various mechanized dryers are more and more widely used.

[0003] The box-type drying device is one of the earliest drying devices used. It has a relatively simple structure, certain flexibility, and a very wide application range. Its drying channel is short and wide, and the internal temperature difference is usually within 10°C, overcoming the deficiencies of large front-back temperature differences and low drying flexibility of other drying devices. However, due to its large width and height, the uniformity of hot air in all directions inside is poor. Products close to the drying inlet will receive more heat, which may cause the products to be overheated. At the same time, products far from the drying inlet will not reach the drying standard due to insufficient heat.

[0004] CN108800801A discloses a heat pump hot air circulation intelligent oven drying device, including an enclosure structure, a air supply channel arranged in the enclosure structure, 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 channel connecting the enclosure structure and the heat pump drying system, a heat pump return air channel, an exhaust air duct, a mode conversion switch arranged in the enclosure structure, and an electric heating controller arranged on the enclosure structure. The present invention adopts a drying mode combining a heat pump and electric heating, which can be freely switched and automatically combined with intelligent control. It uses an energy recovery type moisture exhaust port to increase the evaporation temperature of the heat pump to improve energy efficiency, and adopts a variable cross-section air supply method with a parallel adjustable air supply surface to improve the air flow organization in the drying area, ensure the uniform and stable air flow in the drying area, improve the drying efficiency, and reduce the energy consumption.

[0005] However, the above structure is complex and does not achieve the corresponding temperature-uniform effect. The present invention has made improvements to make the temperature of the whole drying box basically the same in the front, back, left, right, up and down directions, so as to realize the overall drying temperature balance, thereby improving the drying quality and efficiency. Summary of the Invention

[0006] In order to overcome the defects and deficiencies existing in the prior art, the present invention provides a drying system with a new structure, enabling the temperature of the drying oven to be substantially the same in the front, rear, left, right, up, and down directions as a whole, thereby achieving overall uniform drying temperature and improving drying quality and efficiency.

[0007] In order to achieve the above object, the technical solution of the present invention is as follows:

[0008] A temperature-uniform drying system, the system comprising a hot air component and a drying component. The hot air component generates hot air and enters the drying component through a air supply pipeline. The drying component includes a box body, and a box body cavity is provided inside the box body; a drying oven is arranged in the box body cavity. The drying oven has a shell, and a cavity is provided inside the shell. There is a gap between the inner wall of the box body cavity and the shell of the drying oven, thereby 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 oven and then flows out from the lower outlet of the drying oven, and circulates back to the hot air component through a return air pipeline; intervals are formed between the upper, lower, side, and rear parts of the inner wall of the box body cavity and the drying oven, so that the drying oven is immersed in hot air.

[0009] As an improvement, a plurality of horizontal plates are arranged in the up-down direction in the cavity of the drying oven, and the materials to be dried are placed on the horizontal plates.

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

[0011] As an improvement, the materials to be dried are placed on the lower wall of the shell of the drying oven.

[0012] As an improvement, the materials to be dried are paper materials.

[0013] As an improvement, the shell is at least one of copper, aluminum, iron or at least one of copper, aluminum, iron alloys.

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

[0015] As an improvement, the return air pipeline is provided with a bypass pipeline communicating with the air supply pipeline. A first valve is arranged on the bypass pipeline, and a second valve is arranged on the return air pipeline between the bypass pipeline and the hot air component. By adjusting the opening and closing and the opening degree of the first valve and the second valve, the air flow rate of the bypass pipeline is adjusted, and thus the temperature of the hot air entering the drying component is adjusted.

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

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

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

[0019] By setting the housing as a heat conductor, intervals are formed between the upper, lower, side, and rear parts of the inner wall of the cavity of the box body and the drying box, so that the drying box is immersed in hot air. Due to the heat conduction effect, heat is conducted into the upper, lower, left, and right positions of the cavity near the inner wall through the housing, and the temperature of other positions of the box body is transmitted through the convection of hot air, so that the upper, lower, left, and right positions of the cavity inside the housing can have a balanced temperature, realizing overall balanced heating and drying, and avoiding the problem of uneven heating. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0022] Figure 3 is a schematic diagram of the air flow process of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] The following will make a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings.

[0024] In the specification of the present application, unless otherwise specified, the terms "front" and "rear" represent Figure 1 the left and right directions, that is, Figure 1 in, the air inlet of the cavity 25 of the housing is "front", and the corresponding position is "rear".

[0025] Figure 1-2 shows the uniform temperature drying system of the present invention. As Figure 1 shown, a uniform temperature drying system, the system includes a hot air component 1 and a drying component 2, the hot air component 1 generates hot air 2, and enters the drying component 2 through a air supply pipeline 3. The drying component includes a box body 21, and a box cavity 22 is provided inside the box body; a drying box 23 is arranged in the box cavity 22, the drying box 23 has a housing 24, a cavity 25 is provided inside the housing, and an interval is provided between the inner wall of the box cavity and the housing of the drying box, so as to form a hot air channel. The housing is a heat conductor. The hot air inlet 27 of the drying component 2 is located at the rear of the drying component, and the hot air enters the cavity from the front of the drying box, and then flows out from the lower outlet 28 of the drying box, and returns to the hot air component through a return air pipeline 4 in a cycle; intervals are formed between the upper, lower, side, and rear parts of the inner wall of the box cavity and the drying box, so that the drying box is immersed in hot air.

[0026] During the flow of hot air, it enters the rear compartment from the hot air inlet 27, then enters the upper and lower side compartments from the rear, and then enters the cavity from the front of the drying box. After drying is completed, it flows out from the outlet 28. By setting a drying box with a cavity in the cavity of the box body in the present invention, the product to be dried can be placed in the cavity. An air channel is formed between the drying box and the box body. The entire outside of the drying box is immersed in hot air, and there is no temperature dead zone outside the drying box. Heat is transferred into the box body through the heat conductivity of the drying box housing, so that the temperature of the upper, lower, left, and right positions of the cavity inside the housing can be balanced, realizing overall balanced heating and drying, avoiding the problem of uneven heating, and further improving the uniformity of heating.

[0027] Since the air density is small and it flows upward, by setting the hot air outlet 28 at the lower part of the drying box in the present invention, the air dead zone in the cavity can be further reduced, and the overall temperature balance can be improved.

[0028] As an improvement, a fan can be set to strengthen the air flow. The fan can be set on the air inlet pipe and / or the air outlet pipe.

[0029] As an improvement, the hot air inlet 27 is set at a position slightly below the middle of the rear part of the drying component. Since the air density is small and it is easy to flow upward, by setting it like this, the hot air can be evenly distributed up and down, and the balance of the overall drying temperature can be improved.

[0030] As an improvement, a plurality of horizontal plates are arranged in the cavity of the drying box in the up and down direction, and the materials to be dried are placed on the horizontal plates. As an improvement, through holes are arranged on the horizontal plates for the up and down flow of hot air. By setting the through holes, the air can flow between adjacent horizontal plates through the holes, thereby improving the drying efficiency.

[0031] The horizontal plate is a heat conducting plate. The material of the horizontal plate is the same as that of the housing. By setting the heat conducting plate, heat conduction and convective heat transfer can be realized, and the drying efficiency can be improved.

[0032] As an improvement, the horizontal plate extends forward from the rear wall of the cavity. Since the entire outside of the drying box is immersed in hot air and there is no temperature dead zone outside the drying box, heat is transferred into the box body through the heat conductivity of the drying box housing. Therefore, even the position of the horizontal plate close to the housing still maintains a balanced temperature, that is, the temperature of the entire horizontal plate is basically balanced.

[0033] As an improvement, the materials to be dried are placed on the lower wall of the drying box housing. Since the entire outside of the drying box is immersed in hot air, the temperature of the drying box housing is also basically balanced with other positions. The drying box housing can be used as a component for placing drying materials, thereby expanding the drying area and improving the drying efficiency.

[0034] As an improvement, the material to be dried is a paper material. As an improvement, it is paper archival material.

[0035] As an improvement, the housing is at least one of copper, aluminum, iron or at least one of copper, aluminum, iron alloys.

[0036] As an improvement, the lower outlet of the hot air is located at the rear of the drying chamber housing. Since the air density is small and it flows upward, by such an arrangement in the present invention, the air can enter from the front end and exit from the last end, further reducing the air dead zone in the cavity and improving the overall temperature uniformity.

[0037] As an improvement, along the height direction from bottom to top, the intervals of the horizontal plates become smaller and smaller. Since the hot air flows upward, the upper hot air obtains more heat. By such an arrangement, the overall drying balance between the upper and lower parts can be achieved, and the drying efficiency can be improved.

[0038] As an improvement, along the direction from bottom to top, the amplitude of the intervals of the horizontal plates becoming smaller and smaller increases continuously. By setting the amplitude, the overall drying balance between the upper and lower parts can be further achieved, and the drying efficiency can be further improved.

[0039] As an improvement, a diversion door 5 is provided at the hot air inlet of the cavity, and a plurality of holes are provided on the diversion door 5, and the hot air is introduced into the cavity through the plurality of holes.

[0040] As an improvement, the density of the holes on the diversion door decreases from bottom to top. By such an arrangement, the hot fluid is distributed as much as possible below and then flows upward, so that the overall heat distribution is uniform and the drying temperature uniformity is improved.

[0041] As an improvement, the amplitude of the density of the holes on the diversion door decreasing from bottom to top increases continuously. By such an arrangement, the heat distribution can be further made uniform and the drying temperature uniformity can be further improved.

[0042] As an improvement, a bypass pipeline 6 communicating with the air supply pipeline is provided in the return air pipeline, a first valve 7 is provided on the bypass pipeline, and a second valve 8 is provided in the return air pipeline between the bypass pipeline and the hot air component. By adjusting the opening and closing and the opening degree of the first valve and the second valve, the air flow rate of the bypass pipeline is adjusted, and thus the temperature of the hot air entering the drying component is adjusted.

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

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

[0045] By adjusting the opening degrees of the above-mentioned first valve and second valve, on the one hand, the preheating of the recirculated air can be fully utilized, and on the other hand, the temperature of the air inside the drying component can be controlled, thereby controlling the drying temperature.

[0046] A temperature sensor is arranged at the hot air inlet position of the box body, and the temperature of the hot air entering the box body 1 is detected by the temperature sensor.

[0047] As an improvement, the opening degrees of the first valve and the second valve are automatically controlled according to the detected temperature of the hot air.

[0048] At least one support member is arranged in the cavity of the box body for supporting the drying box.

[0049] As an improvement, the box body is provided with a nano heat insulation layer and a lightweight heat preservation layer from the outside to the inside, so as to effectively isolate the box body from the outside and avoid heat loss.

[0050] As an improvement, a furnace door 9 that can be opened and closed is connected to the box body, which is convenient for placing and taking away the drying materials.

[0051] As an improvement, the horizontal plate can be disassembled for easy replacement and maintenance.

[0052] As an improvement, the hot air component 1 can be a solar heat collection device, and hot air is generated by the solar heat collection device.

[0053] As an improvement, in the height direction from bottom to top, the heat conduction coefficients of the rear wall 241 of the housing are different. In the height direction from bottom to top, the heat conduction coefficient gradually decreases. Because the density of hot air is small and it flows upward, by gradually decreasing the heat conduction coefficient, more heat is transferred by heat conduction in the upper part and less in the lower part, so that the heat in the upper and lower parts is balanced, realizing balanced drying.

[0054] As an improvement, in the height direction from bottom to top, the amplitude of the gradual decrease in the heat conduction coefficient of the rear wall 241 of the housing continuously increases. By setting the amplitude, the heat balance can be further realized and balanced drying can be achieved.

[0055] Although the present invention has been disclosed above with preferred embodiments, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A uniform temperature drying system, the system comprising a hot air component and a drying component, the hot air component generating hot air which enters the drying component through an air supply duct, the drying component comprising a box body having a box body cavity inside; a drying box is arranged in the box body cavity, the drying box having a shell body having a cavity inside the shell body, a gap is formed between the inner wall of the box body cavity and the drying box shell body, thereby forming a hot air channel, the shell body is a heat conductor, the hot air inlet of the drying component is located at the rear of the drying component, the hot air enters the cavity from the front of the drying box, then flows out from the lower outlet of the drying box, and circulates back to the hot air component through the return air duct; the upper part, the lower part, the side part and the rear part of the inner wall of the box body cavity are all spaced from the drying box, thereby making the drying box immersed in the hot air.

2. The drying system according to claim 1, characterized in that: A plurality of horizontal plates are arranged in the cavity of the drying box in the up-and-down directions, and the materials to be dried are placed on the horizontal plates.

3. The drying system according to claim 2, characterized in that: A horizontal plate extends forwardly from the rear wall of the cavity.

4. The drying system according to claim 2, characterized in that: The materials to be dried are placed on the lower wall of the drying box shell.

5. The drying system according to claim 2, characterized in that: The material that needs to be dried is paper material.

6. The drying system according to claim 1, characterized in that: The shell is made of at least one of copper, aluminum, and iron, or at least one of an alloy of copper, aluminum, and iron.

7. The drying system according to claim 1, characterized in that: The lower outlet for the hot air is located at the rear of the drying box housing.

8. The drying system according to claim 1, characterized in that: The horizontal plate is a heat conducting plate, and the material of the horizontal plate is the same as the material of the shell.

9. The drying system according to claim 1, characterized in that: The hot air inlet 27 is provided at a lower middle position at the rear of the drying part.

10. The drying system according to claim 1, characterized in that: Through holes are arranged on the horizontal plate for hot air to flow up and down.

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