Convection tunnel furnace

Abstract

The utility model provides a kind of convection tunnel furnace, including furnace body, furnace body includes base and top cover, and drying cavity is formed between base and top cover;Conveying belt, conveying belt is along the length direction of furnace body and is through drying cavity, and is used to convey material;Heating mechanism, heating mechanism includes heating box and the heat conduction plate being set on heating box, heating box is set in the inner bottom of drying cavity, multiple heaters are equipped in heating box, and the heat conduction plate is equipped with multiple convection fans, the air inlet of multiple convection fans is communicated with drying cavity, and the air outlet of multiple convection fans is set towards heater.The utility model is equipped with heat conduction plate, so that the heat generated in heating box can be evenly spread to entire drying box, form greater radiation area, so that the temperature in drying box is more uniform, at the same time, the heating box and convection fan are set, improve the hot air convection effect in drying box, so that hot air can quickly fill entire drying box, and drying cavity rises to specified temperature faster.

Description

Technical Field

[0001] This utility model relates to the field of tunnel furnace technology, and in particular to a convection tunnel furnace. Background Technology

[0002] Tunnel ovens are continuous drying, curing, or sintering equipment widely used in industries such as food, chemicals, and electronics. Their core performance indicators are the temperature uniformity and heating rate within the working area. Traditional tunnel oven heating methods face the following challenges: Top heating mode: Heating tubes are placed above the conveyor belt, with the heat source directly radiating the material. This results in excessively high temperatures on the upper surface and insufficient temperatures on the lower surface, leading to highly uneven heating and potentially causing localized overheating or underheating, affecting product quality. Furthermore, radiant heating suffers from poor stability and low temperature control accuracy. Bottom heating mode: Heating tubes are placed below the conveyor belt. This avoids direct radiation, but the lower density of hot air causes it to rise naturally, creating a temperature difference between the top and bottom of the furnace. The temperature below the conveyor belt is significantly higher than above, resulting in uneven heating of the material. Utility Model Content

[0003] This invention provides a convection tunnel furnace to solve the technical problem of uneven temperature in existing tunnel furnaces.

[0004] This utility model provides a convection tunnel furnace, the convection tunnel furnace comprising: The furnace body includes a base and a top cover, with a drying chamber formed between the base and the top cover; A conveyor belt extends through the drying chamber along the length of the furnace body and is used to convey materials; The heating mechanism includes a heating box and a heat-conducting plate disposed on the heating box. The heating box is disposed at the bottom of the drying chamber. The heating box is provided with multiple heaters. The heat-conducting plate is provided with multiple convection fans. The air inlets of the multiple convection fans are connected to the drying chamber, and the air outlets of the multiple convection fans are arranged facing the heaters.

[0005] In one embodiment of the present invention, the heating box and the heat-conducting plate form a heating cavity, and a plurality of heaters are spaced apart in the heating cavity along the moving direction of the conveyor belt.

[0006] In one embodiment of the present invention, a heat exchange box is provided inside the heating box, the air outlet of the convection fan is correspondingly arranged with the internal space of the heat exchange box, and the heater extends axially through the heat exchange box.

[0007] In one embodiment of the present invention, the heat exchange box includes a shell and a baffle plate disposed inside the shell. The bottom of the heat exchange box has a heat exchange port communicating with the heating cavity. A heat exchange channel communicating with the heat exchange cavity is formed between the baffle plates. The heat exchange channel is communicating with the heat exchange port.

[0008] In one embodiment of the present invention, a one-way plate is provided between the heat exchange channels, and the opening direction of the one-way plate faces the heat exchange port.

[0009] In one embodiment of the present invention, a heat exchange cavity is formed between the baffle and the housing, and at least one of the heaters penetrates the heat exchange cavity.

[0010] In one embodiment of the present invention, the heating box is provided with multiple sets of air outlets along its length direction, the multiple sets of air outlets are respectively connected to the drying chamber and the heating chamber, and the multiple sets of air outlets and multiple heaters are alternately arranged along the length direction of the heating box.

[0011] In one embodiment of this utility model, the heater is a heating tube, and the heating tube is arranged in the heating cavity along the width direction of the heating box, and adjacent heating tubes are electrically connected.

[0012] In one embodiment of the present invention, the top cover is provided with a plurality of exhaust fans, and the input ends of the plurality of exhaust fans are connected to the drying chamber.

[0013] In one embodiment of this utility model, the base is provided with multiple support legs.

[0014] The beneficial effects of this utility model are as follows: The convection tunnel oven proposed in this utility model, through the setting of heat-conducting plates, allows the heat generated in the heating box to be evenly diffused to the entire drying box, forming a larger radiation area, so that the temperature in the drying box rises synchronously and faster. At the same time, the setting of heating box and convection fan improves the convection effect of hot air in the drying box, so that hot air can quickly fill the entire drying box. Compared with the prior art, the temperature inside the oven in this application is more uniform, and the drying chamber rises to the specified temperature faster. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0016] In the attached diagram: Figure 1A cross-sectional view provided for an embodiment of this utility model; Figure 2 This is a top view of the heating mechanism provided in one embodiment of the present invention; Figure 3 This is a side view of a heating mechanism provided in one embodiment of the present invention; Figure 4 This is an enlarged view of point A provided in one embodiment of the present invention; Figure 5 This is a cross-sectional view of a heat exchange box provided in one embodiment of this utility model.

[0017] The attached figures are labeled as follows: 1. Base, 2. Support leg, 3. Top cover, 4. Drying chamber, 5. Heating box, 501. Heating chamber, 6. Heat conduction plate, 7. Convection fan, 8. Heat exchange box, 801. Heat exchange port, 802. Baffle plate, 9. One-way plate, 10. Air outlet, 11. Heater, 12. Exhaust fan. Detailed Implementation

[0018] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0021] Before describing this application, it is necessary to explain the application scenario. The convection tunnel furnace proposed in this application is mainly used for drying microwave absorbing materials. The slurry is laid on the film through the equipment and sent into the tunnel furnace by the conveyor belt. The uniform heating and rapid temperature rise of this application can make the finished film of higher quality.

[0022] like Figure 1 - Figure 5 As shown, this utility model provides a convection tunnel furnace.

[0023] In an exemplary embodiment, the convection tunnel oven includes a furnace body, which includes a base 1 and a top cover 3. A drying chamber 4 is formed between the base 1 and the top cover 3. A channel for a conveyor belt to pass through is provided between the base 1 and the top cover 3. The conveyor belt passes through the drying chamber 4 along the length of the furnace body and is used to convey materials. In this embodiment, the material is a thin film. The conveyor belt moves by rotating rollers. A heating mechanism is also provided, which includes a heating box 5 and a heat-conducting plate 6 disposed on the heating box 5. The heating box 5 is disposed at the bottom of the drying chamber 4. A plurality of heaters 12 are disposed inside the heating box 5. A plurality of convection fans 7 are disposed on the heat-conducting plate 6. The air inlets of the plurality of convection fans 7 are connected to the drying chamber 4, and the air outlets of the plurality of convection fans 7 are disposed towards the heaters 12.

[0024] In this embodiment, the heat generated in the heating box 5 is evenly diffused into the entire drying box by the heat-conducting plate 6, forming a larger radiation area, which makes the temperature in the drying box rise faster. At the same time, the heating box 5 and the convection fan 7 can improve the convection effect of hot air in the drying box, so that hot air can quickly and evenly fill the entire drying box. Compared with the prior art, the temperature inside the furnace in this application is more uniform, and the drying chamber 4 rises to the specified temperature faster.

[0025] For example, in this embodiment, the size of the heating mechanism is as large as possible and is adaptively set according to the size of the furnace body, so that the heat-conducting plate 6 is as large as possible in the length and width directions, so that it can radiate to more areas and improve the thermal uniformity and heating speed inside the furnace body.

[0026] It is worth noting that in this embodiment, the base 1 is mounted on the ground by the support leg 2, and the top cover 3 is mounted on the base 1 and supported by the base 1.

[0027] It should also be noted that in this embodiment, the heat-conducting plate 6 is made of a material that is resistant to high temperatures and has excellent thermal conductivity in order to facilitate rapid heat conduction.

[0028] In one exemplary embodiment, the heating box 5 and the heat-conducting plate 6 form a heating cavity 501, and a plurality of heaters 12 are spaced apart in the heating cavity 501 along the moving direction of the conveyor belt.

[0029] In this embodiment, multiple heaters 12 installed in the heating chamber 501 can heat the air introduced by the convection fan 7, thereby increasing the overall temperature of the heating box 5 and simultaneously heating the heat conduction plate 6, thus achieving thermal radiation.

[0030] For example, in this embodiment, multiple heaters 12 are arranged at intervals along the length of the furnace body. The heaters 12 are heating tubes, and adjacent heating tubes are electrically connected. The control module controls all heaters 12 to a specified temperature.

[0031] For example, in this embodiment, multiple heat exchange boxes 8 are provided inside the heating box 5. The air outlet of the convection fan 7 is correspondingly arranged with the internal space of the heat exchange box 8. Therefore, the number of heat exchange boxes 8 corresponds to the number of convection fans 7. The heater 12 axially penetrates the heat exchange box 8. In a specific embodiment, the heat exchange box 8 includes a shell and a baffle plate 9 disposed inside the shell. A heat exchange cavity 801 is formed between the baffle plate 9 and the shell. At least one heater 12 penetrates the heat exchange cavity 801. A heat exchange port 802 communicating with the heating cavity 501 is opened at the bottom of the heat exchange box 8. A heat exchange channel communicating with the heat exchange cavity 801 is formed between the baffle plates 9. The heat exchange channel communicates with the heat exchange port 802. When the air in the drying chamber 4 is introduced into the heat exchange box 8 by the convection fan 7, the air in the heat exchange box 8 is rapidly heated by the heater 12 because the main heating section of the heater 12 is located inside the heat exchange box 8. The hot air expands when heated and enters the heating chamber 501 through the heat exchange channel from the heat exchange port 802. The overall temperature of the heating chamber 501 rises, causing the temperature of the heat conduction plate 6 to rise synchronously, so as to achieve the function of heat radiation.

[0032] It is worth noting that in this embodiment, a one-way plate 10 is provided between the heat exchange channels. The opening of the one-way plate 10 faces the heat exchange port 802. By setting the one-way plate 10, air is prevented from entering the heat exchange box 8 from the heat exchange port 802, ensuring that the air flow is from the heat exchange chamber 801 to the heat exchange port 802, thereby outputting stable hot air. In a specific embodiment, the one-way plate 10 is made of two plates hinged to the baffle plate 9, which is similar to a one-way door, with the opening facing the heat exchange port 802.

[0033] In an exemplary embodiment, the heating chamber 5 is provided with multiple sets of air outlets 11 along its length direction. The multiple sets of air outlets 11 are respectively connected to the drying chamber 4 and the heating chamber 501. The multiple sets of air outlets 11 and multiple heaters 12 are alternately arranged along the length direction of the heating chamber 5.

[0034] In this embodiment, the multiple air outlets 11 enable the hot air inside the heating chamber 5 to be released into the drying chamber 4, allowing the hot air to quickly fill the drying chamber 4. Combined with the heat radiation effect of the heat-conducting plate 6, the temperature uniformity and heating rate of the drying chamber 4 inside the furnace are improved.

[0035] For example, in this embodiment, each group of air outlets 11 consists of multiple through holes vertically arranged on the side wall of the heating box 5. In specific embodiments, the number of air outlets 11 in a single group is 3 to 5, and the number selected in this embodiment is three.

[0036] It is worth noting that in this embodiment, due to the multiple air outlets 11 provided, the water vapor in the air heated in the heating box 5 will also enter the drying chamber 4 through the air outlets 11 and be drawn away and discharged by the exhaust fan 13.

[0037] In an exemplary embodiment, the top cover 3 is provided with a plurality of exhaust fans 13, and the input ends of the plurality of exhaust fans 13 are connected to the drying chamber 4.

[0038] In this embodiment, the water vapor generated above is discharged through the exhaust fan 13. When the exhaust fan 13 is working, the corresponding power can be set to avoid the exhaust fan 13 drawing out too much hot air from the drying chamber 4. While ensuring the dehumidification effect, the hot air circulation and reusability are ensured, thereby improving the temperature stability inside the drying chamber 4.

[0039] In summary, the present invention, through the heat-conducting plate 6, enables the heat generated in the heating box 5 to be evenly diffused throughout the drying box, forming a larger radiation area and making the temperature inside the drying box more uniform. At the same time, the heating box 5 and the convection fan 7 improve the convection effect of hot air inside the drying box, so that hot air can quickly fill the entire drying box, and the drying chamber 4 can reach the specified temperature faster.

[0040] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A convection tunnel furnace, characterized in that, include: The furnace body includes a base and a top cover, with a drying chamber formed between the base and the top cover; A conveyor belt extends through the drying chamber along the length of the furnace body and is used to convey materials; The heating mechanism includes a heating box and a heat-conducting plate disposed on the heating box. The heating box is disposed at the bottom of the drying chamber. The heating box is provided with multiple heaters. The heat-conducting plate is provided with multiple convection fans. The air inlets of the multiple convection fans are connected to the drying chamber, and the air outlets of the multiple convection fans are arranged facing the heaters.

2. The convection tunnel furnace according to claim 1, characterized in that: The heating box and the heat-conducting plate form a heating cavity, and a plurality of the heaters are spaced apart in the heating cavity along the moving direction of the conveyor belt.

3. The convection tunnel furnace according to claim 2, characterized in that: The heating box contains a heat exchange box, the air outlet of the convection fan is correspondingly arranged with the internal space of the heat exchange box, and the heater axially penetrates the heat exchange box.

4. The convection tunnel furnace according to claim 3, characterized in that: The heat exchange box includes a shell and baffles disposed inside the shell. The bottom of the heat exchange box has a heat exchange port communicating with the heating chamber. A heat exchange channel communicating with the heat exchange chamber is formed between the baffles. The heat exchange channel is connected to the heat exchange port.

5. The convection tunnel furnace according to claim 4, characterized in that: A one-way plate is provided between the heat exchange channels, and the opening of the one-way plate faces the heat exchange port.

6. The convection tunnel furnace according to claim 4, characterized in that: A heat exchange cavity is formed between the baffle and the housing, and at least one of the heaters passes through the heat exchange cavity.

7. The convection tunnel furnace according to claim 2, characterized in that: The heating box is provided with multiple sets of air outlets along its length, and the multiple sets of air outlets are respectively connected to the drying chamber and the heating chamber. The multiple sets of air outlets and multiple heaters are alternately arranged along the length of the heating box.

8. The convection tunnel furnace according to claim 1, characterized in that: The heater is a heating tube, and the heating tube is arranged in the heating cavity along the width direction of the heating box. Adjacent heating tubes are electrically connected.

9. The convection tunnel furnace according to claim 1, characterized in that: The top cover is equipped with multiple exhaust fans, and the input ends of the multiple exhaust fans are connected to the drying chamber.

10. The convection tunnel furnace according to claim 1, characterized in that: The base is equipped with multiple support legs.

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