Hot air oven adopting metal foil for infrared heating

Abstract

The utility model discloses a hot air oven adopting metal foil infrared heating. The hot air oven comprises an inner oven body located in an outer oven body, a heating rod and a draught fan. A cavity is formed between the inner box body and the outer box body, and a plurality of ventilation holes communicated with the cavity are formed in the inner box body; the heating rod is installed in the cavity, the metal foil infrared radiation sheet is arranged in the inner box body, and a gap is reserved between the metal foil infrared radiation sheet and the wall of the inner box body; the fan is installed on the top of the air bellow, and fan blades are located in a cavity space between the top of the inner box body and the outer box body. According to the hot air oven, the metal foil infrared radiation sheet is additionally arranged in the oven, heat loss is rapidly compensated through infrared radiation of the metal foil infrared radiation sheet, and the working efficiency of the hot air oven is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal composite adds and its processing technical field, concretely relates to a hot air oven and processing method and application of infrared heating of metal foil. BACKGROUND

[0002] The hot air oven is a kind of equipment widely used in industrial production, food processing, pharmaceutical manufacturing and other fields, and is mainly used in the drying, heating and other processes of materials. Its working principle is to heat air and force circulation, so that materials are quickly dehydrated or chemical reactions are completed in uniform temperature environment. With the progress of industrial technology and the improvement of environmental protection requirements, the research and application of hot air oven gradually become a hot field.

[0003] At present, the hot air oven using resistance wire heating is a kind of equipment widely used in drying technology, and its structural design is based on resistance wire heating and forced air circulation, and its main structural components include resistance wire and fan. The resistance wire is usually installed in the heating cavity and directly heats the surrounding air to form hot air and provide heat source for materials. The fan is usually located at the top or side of the oven and guides the hot air flow through the air duct. Its working principle is based on the conversion of electric energy into heat energy and the forced circulation of air to realize the uniform heating and drying of materials.

[0004] This kind of hot air oven relying on resistance wire heating and forced convection circulation to realize the uniform heating and drying of materials has simple and efficient working principle, but its limitations are also obvious. The main defects include: 1. After opening the door, cold air rushes in, which causes the temperature in the oven to drop rapidly, the heat loss is serious, and it takes 10-15 minutes to recover, which affects the process continuity; 2. Large thermal inertia, traditional resistance wire heating is slow (5-10 minutes), which cannot quickly compensate for heat loss. UTILITY MODEL CONTENTS

[0005] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a hot air oven using metal foil infrared heating, which increases metal foil infrared radiation sheet inside the oven, uses metal foil infrared radiation sheet to quickly compensate for heat loss, and improves the working efficiency of the hot air oven.

[0006] To solve the above problems, the technical scheme adopted by the present application is as follows:

[0007] The embodiment of the present application provides a hot air oven adopting metal foil infrared heating, which comprises an outer box body, an inner box body located in the inner box body, a heating rod and a fan; further comprises a metal foil infrared radiation sheet; a cavity is arranged between the inner box body and the outer box body, and a plurality of ventilation holes communicating with the cavity are arranged on the inner box body; the heating rod is installed in the cavity, the metal foil infrared radiation sheet is arranged in the inner box body, and a gap is left between the metal foil infrared radiation sheet and the inner box body wall; the fan is installed at the top of the air box, and the fan blades are located in the cavity space between the top of the inner box body and the outer box body.

[0008] As a further preferred scheme, the metal foil infrared radiation sheet described in the embodiment of the present application comprises a plurality of long strip-shaped metal foil sheets, the plurality of metal foil sheets are equidistantly distributed on the two opposite side surfaces of the inner box body, the upper ends are fixed on the top of the inner box body, and the lower ends are fixed on the bottom of the inner box body.

[0009] As a further preferred scheme, the metal foil sheet described in the embodiment of the present application is in a wave shape structure, the thickness is 50-200 mu m, and the height of the wave peak of the wave shape structure on the metal foil sheet is 10-20 times of the thickness of the metal foil sheet.

[0010] As a further preferred scheme, the width of the metal foil sheet described in the embodiment of the present application is 10-30 mm.

[0011] As a further preferred scheme, in the hot air oven adopting metal foil infrared heating described in the embodiment of the present application, the spacing between two adjacent metal foil sheets is greater than or equal to the width of the metal foil sheet; the ventilation holes are arranged at the spacing between two adjacent metal foil infrared radiation sheets and are equidistantly arranged from top to bottom.

[0012] As a further preferred scheme, the metal foil infrared radiation sheet described in the embodiment of the present application is an electric heating alloy sheet, which directly radiates infrared light with a wavelength of 2-15 mu m after being electrified.

[0013] As a further preferred scheme, the heating rod described in the embodiment of the present application is a resistance wire heating rod, and the heating rod is arranged on the rear side of the ventilation hole.

[0014] As a further preferred scheme, the fan described in the embodiment of the present application is a centrifugal fan.

[0015] As a further preferred scheme, the hot air oven adopting metal foil infrared heating described in the embodiment of the present application further comprises a controller and a temperature sensor, the temperature sensor is used for monitoring the temperature in the oven in real time and transmitting a temperature signal to the controller, and the controller controls the operating state of the metal foil infrared radiation sheet according to the temperature signal.

[0016] As a further preferred scheme, the outer box body and the inner box body are provided with a heat insulation layer, which is tightly attached to the inner wall of the outer box body.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] 1. The heating rod of the hot air oven adopting metal foil infrared heating is installed in the cavity between the inner and outer box bodies, the fan is located at the top of the air box, and the blades are located in a specific cavity space, so that the heat generated by the heating rod can be efficiently sent into the inner box body through the ventilation holes to form a hot air circulation.

[0019] 2. The ventilation holes of the inner box body of the hot air oven adopting metal foil infrared heating are arranged in a plurality of communication cavities, which are matched with the position and operation of the fan, so that the hot air uniformly enters the inner box body from each ventilation hole, and the convection distribution of the heat in the box is more uniform.

[0020] 3. The metal foil infrared radiation sheet of the hot air oven adopting metal foil infrared heating only operates at full power when the temperature in the box rapidly decreases due to opening the door or the like, and stops working when the temperature rises to the set value, and mainly relies on the hot air circulation system composed of the heating rod and the fan to maintain normal heating, so that the energy consumption is precisely controlled.

[0021] 4. The metal foil infrared radiation sheet of the hot air oven adopting metal foil infrared heating is independently arranged in the inner box body and has a gap with the box wall, so that damage caused by thermal expansion and contraction of the box wall and the like is avoided, the service life of the whole equipment is prolonged, and the maintenance cost and downtime are reduced.

[0022] 5. The hot air oven adopting metal foil infrared heating described in the embodiment of the present application can avoid the problems of local overheating or insufficient heating in the production of products such as copper-clad plates and electronic components, and improve the consistency and yield of products.

[0023] The utility model will be described in further detail below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can also be obtained by those skilled in the art without creative labor on the premise of the drawings.

[0025] Figure 1 The structure schematic diagram of the hot air oven adopting metal foil infrared heating described in the embodiment of the present application.

[0026] Figure 2 The longitudinal sectional view of the hot air oven adopting metal foil infrared heating described in the embodiment of the present application.

[0027] Figure 3 The internal structure schematic diagram of the hot air oven adopting metal foil infrared heating described in the embodiment of the present application.

[0028] Figure 4 The local enlarged schematic diagram of the metal foil described in the embodiment of the present application.

[0029] Among them, various signs are: 10, outer box body; 20, inner box body; 21, ventilation hole; 30, heating rod; 40, fan; 50, metal foil infrared radiation sheet; 60, cavity. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0031] The term "comprising" and other similar descriptions in the specification and claims of the present application are all used to cover non-exclusive inclusion, that is, both the contents explicitly described in the specification and claims can be included, and the steps or units not described in the specification and claims but inherent in the product, method or structure can also be included.

[0032] Embodiment 1, as shown in Figure 1 , Figure 2 The embodiment provides a hot air oven using metal foil infrared heating, which comprises an outer box body 10, an inner box body 20 located in the inner box body 10, a heating rod 30 and a fan 40; further comprising a metal foil infrared radiation sheet 50; a cavity 60 is arranged between the inner box body 20 and the outer box body 10, a plurality of ventilation holes 21 are arranged on the inner box body 20 and communicate with the cavity 60, the position of the ventilation hole 21 cooperates with the position and operation of the fan 40, so that the hot air uniformly enters the inner box body 20 from each ventilation hole 21, so that the convection distribution of the heat in the box is more uniform; the heating rod 30 is installed in the cavity 60, which reduces the direct contact with the external environment, and the cavity 60 itself has a certain heat insulation effect, which can reduce the heat loss to the outside and optimize the utilization rate of heat energy; the metal foil infrared radiation sheet 50 is arranged in the inner box body, specifically, the metal foil infrared radiation sheet 50 comprises a plurality of long strip-shaped metal foil sheets, a plurality of the metal foil sheets are equidistantly distributed on the two opposite sides of the inner box body, the upper end is fixed on the top of the inner box body, and the lower end is fixed on the bottom of the inner box body; a gap is left between the metal foil infrared radiation sheet 50 and the wall of the inner box body 20, which can effectively ensure that the infrared radiation energy can freely propagate in the box, and avoid local overheating or overcooling phenomenon; the fan is installed at the top of the air box, and the fan blades are located in the cavity space between the top of the inner box body and the outer box body. The position of the fan installation optimizes the hot air circulation path, and the blades are in a specific cavity space, which can efficiently send the heat generated by the heating rod into the inner box through the ventilation hole to form a hot air circulation.

[0033] As shown in Figure 3 , Figure 4 On the basis of the above embodiment 1, in some embodiments of the present application, the metal foil sheet used is a wave-shaped structure. In this scheme, the wave-shaped structure of the metal foil sheet makes the propagation path of the infrared radiation in the box more complex and diversified. The concave-convex structure formed by the wave crest and the wave trough makes the infrared light continuously reflect and scatter in the box, avoids the concentration of infrared radiation in a certain area, and ensures that both the central area in the box and the objects close to the box wall can receive more uniform infrared radiation. Together with the hot air circulation, it further improves the uniformity of the temperature in the box and greatly improves the product quality stability. Further preferably, the thickness of the metal foil sheet is 50-200 μm. Preferably, the thickness of the metal foil sheet is 100 μm. The relatively thin thickness makes the foil sheet resistance relatively large. According to Joule's law Q=I 2Rt (wherein Q is heat, I is current, R is resistance, t is time), under the same current conditions, the greater the resistance means that the heat generated is more concentrated and fast; the thinner metal foil quickly heats up, while meeting the demand for heat compensation, without the need for high power input; if the foil is too thick, the resistance becomes smaller, the heating speed will slow down, and it cannot meet the demand for rapid heat compensation of the oven. Therefore, by adjusting the thickness of the metal foil, the infrared radiation effect can be improved, and the heat can be quickly supplemented in the box. The greater the wave height greatly increases the surface area of the metal foil, the greater the surface area, the more energy is radiated outward per unit time. Therefore, in some embodiments of the present application, the height of the wave structure on the metal foil is 10-20 times the thickness of the metal foil.

[0034] On the basis of the above-mentioned embodiment 1, further, in some embodiments, the width of the metal foil is adjusted to adjust the uniform distribution of infrared radiation in the box. If the foil is too narrow, its radiation range is limited, which may result in that some areas in the box cannot receive enough infrared radiation. Therefore, in these embodiments, the width of the metal foil is 10-30 mm.

[0035] On the basis of the above-mentioned embodiment 1, further, in the hot air oven with metal foil infrared heating, the distance between two adjacent metal foils is greater than or equal to the width of the metal foil. This distance provides sufficient space for the propagation of infrared radiation. A larger distance can avoid mutual interference and shielding of infrared light during propagation, so that infrared radiation can more effectively cover the space in the box and uniformly heat the articles. The ventilation holes are arranged at the distance between two adjacent metal foil infrared radiation sheets, and are arranged equidistantly from top to bottom. Such a layout enables the hot air blown by the fan to smoothly pass through the ventilation holes into the inner box body after being heated by the heating rod, and to cooperate with the infrared radiation. The hot air flows in the channel formed between the metal foils, which not only carries away part of the heat generated by the metal foil to speed up the heat transfer efficiency, but also heats the articles in the box together with the infrared radiation to improve the overall heating efficiency. In this scheme, the distance between the metal foils ensures uniform coverage of the infrared radiation, and the equidistant arrangement of the ventilation holes at the distance ensures that both the areas close to the metal foils and the areas far from the metal foils are heated by uniform infrared radiation and convection of hot air at the same time. In addition, the ventilation holes arranged at the distance also facilitate the cleaning of dust, impurities and the like that may accumulate in the ventilation holes, ensure smooth ventilation, maintain normal operation of the equipment, and reduce the difficulty of equipment maintenance.

[0036] As a further preferred scheme, the metal foil infrared radiation sheet described in the embodiments of the present application is an electrothermal alloy sheet, which is an ultra-thin metal sheet of iron-chromium-aluminum alloy. The alloy material has good heat conductivity, and the metal foil infrared radiation sheet can uniformly radiate infrared light to the surroundings after being heated. The ultra-thin metal sheet made of the alloy material can rapidly heat up to above 700℃ after being electrified and directly radiate infrared light with a wavelength of 2-15 μm. The infrared light with this wavelength range has a strong thermal effect and can be efficiently absorbed by most heated objects, directly acting on the molecules of the objects to promote the vibration of the molecules, thereby realizing rapid heating and efficient heating. The metal foil sheet made of iron, chromium and aluminum alloy has good electrical conductivity and thermal performance and can efficiently convert electrical energy into heat energy at full power to realize rapid heat compensation with less energy consumption.

[0037] On the basis of the above-mentioned embodiment 1, it is further preferred that, in some embodiments, the heating rod is an electric resistance wire heating rod, and the heating rod is arranged at the rear side of the ventilation opening. The air sent by the fan first passes through the electric resistance wire heating rod before entering the ventilation opening, so that the air can fully absorb the heat generated by the electric resistance wire and rapidly heat up to hot air, which then efficiently enters the inner box through the ventilation holes. Due to the preheating effect of the heating rod on the air being concentrated near the ventilation opening, the hot air blown out from each ventilation hole has a relatively consistent temperature, which further optimizes the heat distribution in the box in cooperation with the infrared radiation of the metal foil infrared radiation sheet.

[0038] The hot air oven using metal foil infrared heating described in the embodiments of the present application further comprises a controller and a temperature sensor. The controller is used to control the start and stop of the electric heating rod and the metal foil infrared radiation sheet. The temperature sensor is used to monitor the temperature in the oven in real time and transmit the temperature signal to the controller. The controller controls the operating state of the metal foil infrared radiation sheet according to the temperature signal. When the hot air oven is opened, the temperature sensor will sense the temperature change in the oven and send a signal of the temperature change to the controller. The controller will make feedback according to the received signal and make the metal foil infrared radiation sheet electrified to generate heat, thereby compensating for the heat loss caused by opening the door.

[0039] As a further preferred scheme, a heat insulation layer is arranged between the outer box and the inner box, and the heat insulation layer is tightly attached to the inner wall of the outer box. The presence of the heat insulation layer greatly hinders the conduction of heat from the outer box to the external environment. Compared with the oven without the heat insulation layer, the heat insulation layer can effectively reduce the loss of a large amount of heat and ensure that more heat is retained in the inner box to provide a continuous and stable heating environment for the objects in the box, thereby improving the utilization efficiency of heat. The heat insulation layer is tightly attached to the inner wall of the outer box, thereby reducing the stress change of the outer box due to frequent thermal expansion and cold contraction.

[0040] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A hot air drying oven using metal foil infrared heating, comprising an outer casing, an inner casing located inside the outer casing, heating rods, and a fan; characterized in that, It also includes a metal foil infrared radiating sheet, a cavity is provided between the inner box and the outer box, and a number of ventilation holes communicating with the cavity are provided on the inner box; the heating rod is installed in the cavity, the metal foil infrared radiating sheet is arranged in the inner box, and a gap is left between the metal foil infrared radiating sheet and the inner box wall; the fan is installed on the top of the fan box, and the fan blades are located in the cavity space between the top of the inner box and the outer box.

2. The hot air drying oven using metal foil infrared heating according to claim 1, characterized in that, The metal foil infrared radiation sheet includes several long strips of metal foil, which are equidistantly distributed on two opposite sides of the inner box. The upper end of the metal foil is fixed to the top of the inner box, and the lower end is fixed to the bottom of the inner box.

3. The hot air drying oven using metal foil infrared heating according to claim 2, characterized in that, The infrared radiation sheet of the metal foil has a wavy structure with a thickness of 50μm-200μm. The height of the peak of the wavy structure on the metal foil is 10-20 times the thickness of the metal foil.

4. The hot air drying oven using metal foil infrared heating according to claim 3, characterized in that, The width of the metal foil infrared radiation sheet is 10mm-30mm.

5. The hot air drying oven using metal foil infrared heating according to claim 4, characterized in that, The spacing between two adjacent metal foils is greater than or equal to the width of the metal foil; the ventilation holes are distributed at the spacing between two adjacent metal foils and are arranged at equal intervals from top to bottom.

6. The hot air drying oven using metal foil infrared heating according to any one of claims 2-5, characterized in that, The metal foil is an electrothermal alloy sheet that directly radiates infrared light with a wavelength of 2μm to 15μm when energized.

7. The hot air drying oven using metal foil infrared heating according to claim 1, characterized in that, The heating rod is a resistance wire heating rod, and the heating rod is located on the rear side of the vent.

8. The hot air drying oven using metal foil infrared heating according to claim 1, characterized in that, The fan is a centrifugal fan.

9. The hot air drying oven using metal foil infrared heating according to claim 1, characterized in that, It also includes a controller and a temperature sensor. The temperature sensor is used to monitor the temperature inside the oven in real time and transmit the temperature signal to the controller. The controller controls the operating status of the metal foil infrared radiation sheet according to the temperature signal.

10. The hot air drying oven using metal foil infrared heating according to claim 1, characterized in that, A heat insulation layer is provided between the outer casing and the inner casing, and the heat insulation layer is tightly attached to the inner wall of the outer casing.

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