Filter cloth drying device

Abstract

The filter cloth drying device is used for drying cleaned filter cloth and comprises a drying chamber provided with a filter cloth inlet and a filter cloth outlet, the drying chamber is further provided with a hot air inlet and a hot air outlet which are oppositely arranged, the hot air inlet is provided with a heater, and the hot air outlet is communicated with an air outlet guide assembly. A hot air channel is formed between the hot air inlet and the hot air outlet, a plurality of cloth guide rollers are arranged in the drying chamber and arranged on the inner walls of the two sides of the drying chamber in a staggered mode along the hot air channel, and the filter cloth is wound and attached to the peripheries of the cloth guide rollers in a spreading state, so that the filter cloth is arranged in the hot air channel in a multi-layer spreading mode. Air entering from the outside forms hot air through the heater, the hot air is introduced into the drying chamber through the hot air inlet to conduct hot air penetrating drying on the filter cloth arranged in the multi-layer spreading mode, and the air is guided and exhausted through the air outlet guiding assembly. The filter cloth drying device can effectively dry soy sauce filter cloth and remove moisture, infectious microbes and peculiar smell on the filter cloth, so that the quality of soy sauce is guaranteed when the filter cloth is used for squeezing production subsequently.

Description

Technical Field

[0001] This utility model relates to the field of soy sauce production equipment, specifically a filter cloth drying device. Background Technology

[0002] In the soy sauce production process, after the koji mixed with brine has fermented in the fermentation tank, it undergoes major processes such as solid-liquid separation, heating, clarification, filtration, and packaging. Solid-liquid separation is generally carried out using the pressing method, which requires wrapping the soy mash with a special soy sauce filter cloth for pressing. After pressing, the raw material forms dry residue, which is then separated from the filter cloth. The separated filter cloth needs to be cleaned and ready for the next use.

[0003] With increasingly stringent and refined requirements for food safety and product variety, the cleaning requirements for filter cloths are also becoming more stringent. However, no matter how the filter cloth is cleaned, it is impossible to completely remove some residues or impurities attached to it. During the shelf life after cleaning, bacteria will multiply using the residual residues or impurities as nutrients. Furthermore, bacteria are more likely to multiply in the humid environment of the filter cloth after cleaning, causing the filter cloth to produce a foul odor. This foul odor will have an adverse effect on the product and affect the subsequent production and use of the filter cloth. The above problems are a major issue that urgently needs to be solved in the industry. Utility Model Content

[0004] To address the above problems, this utility model provides a filter cloth drying device that uses hot air to penetrate and dry the multi-layered filter cloth, effectively removing moisture, bacteria, and odors from the filter cloth, thereby ensuring the quality of soy sauce produced using filter cloth during pressing.

[0005] This utility model discloses a filter cloth drying device for drying cleaned filter cloth, comprising:

[0006] The drying chamber, used for drying the filter cloth, has a filter cloth inlet and a filter cloth outlet.

[0007] The drying chamber also features a hot air inlet and a hot air outlet positioned opposite each other. The hot air inlet is equipped with a heater, and the hot air outlet is connected to an air outlet guiding assembly. Both the filter cloth inlet and outlet are sealed, and there are also sealed connections between the hot air inlet and the heater, as well as between the hot air outlet and the air outlet guiding assembly.

[0008] A hot air channel is formed between the hot air inlet and the hot air outlet. Multiple guide rollers are installed inside the drying chamber, staggered along the inner walls of both sides of the chamber. The filter cloth is rolled up and laid out on the outer periphery of the guide rollers, resulting in multiple layers of filter cloth spread out within the hot air channel. ， External air enters through a heater to form hot air, which is then introduced into the drying chamber through the hot air inlet to dry the multi-layered filter cloth. The hot air is then guided out by the air outlet guide component.

[0009] According to the above technical solution, hot air is heated by a heater and then guided out by an air outlet guide component, allowing the hot air to penetrate the filter cloth and effectively dry it. Simultaneously, the multi-layered arrangement of the filter cloth within the hot air channel effectively increases the contact area between the hot air and the filter cloth, further enhancing the drying effect and effectively removing moisture, bacteria, and odors from the filter cloth, thus ensuring the quality of soy sauce used in subsequent pressing production. Furthermore, it keeps the filter cloth dry and clean, slowing down corrosion and effectively extending its service life.

[0010] Optionally, a vacuum water absorption component is also provided on the outside of the filter cloth inlet.

[0011] According to the above technical solution, before the filter cloth enters the drying chamber, most of the moisture in the filter cloth is removed by vacuum water absorption, which can effectively enhance the drying efficiency of the filter cloth.

[0012] Optionally, a first driving component is provided outside the filter cloth inlet, and a second driving component is provided outside the filter cloth outlet. The filter cloth is pulled into the drying chamber by the first driving component and simultaneously moved within the drying chamber by the second driving component.

[0013] According to the above technical solution, the filter cloth can be automatically pulled for cleaning and drying by the first and second driving components, reducing labor costs.

[0014] Optionally, an inlet guide is provided between the first driving component and the filter cloth inlet, and an outlet guide is provided between the second driving component and the filter cloth outlet.

[0015] According to the above technical solution, the filter cloth can be stably aligned and enter the drying chamber, effectively preventing the filter cloth from deviating during the drying process.

[0016] Optionally, a baffle plate is provided between the guide roller and the inner wall of the adjacent drying chamber.

[0017] According to the above technical solution, by setting up a baffle plate, the movement path of hot air in the drying chamber can be increased, ensuring that the hot air and the filter cloth are in full contact for drying, which effectively improves the drying efficiency; and it can also ensure that the input hot air can penetrate the filter cloth for drying, effectively guaranteeing the drying effect.

[0018] Optionally, the heater has an air outlet connected to the hot air inlet and an air inlet opposite to the air outlet. A heat exchange tube assembly is provided between the air inlet and the air outlet. One end of the heat exchange tube assembly is connected to a steam tube assembly, and the other end is connected to a return water tube assembly. The steam tube assembly generates steam and inputs it into the heat exchange tube assembly to exchange heat with the external air. The steam then condenses into water and flows into the return water tube assembly.

[0019] According to the above technical solution, steam and air heat exchange is provided through steam pipe groups, which has high heat exchange efficiency. At the same time, by adjusting the steam flow and pressure, the steam temperature can be precisely controlled, thereby accurately controlling the hot air temperature, which can effectively save energy and reduce production costs.

[0020] Optionally, the air inlet is also equipped with a protective cover.

[0021] According to the above technical solution, by setting up a protective cover, high-temperature burns can be prevented, and dust accumulation can be prevented from affecting the efficiency of hot air generation.

[0022] Optionally, the air outlet guiding assembly includes a first air duct connected to the hot air outlet, a second air duct connected to the first air duct, and a fan disposed between the first air duct and the second air duct, which guides the hot air from the drying chamber to be discharged.

[0023] According to the above technical solution, the air outlet guiding component can guide hot air out of the drying chamber, thereby increasing the hot air velocity and allowing the hot air to penetrate the filter cloth more quickly for drying, further improving drying efficiency. Simultaneously, it enables the formation of a stable hot air channel between the hot air inlet and outlet to ensure hot air penetration and drying of the filter cloth, guaranteeing the drying effect.

[0024] Optionally, a temperature sensor is also provided in the first air duct, and a steam flow regulating valve is also provided in the steam pipe group. The temperature sensor is communicatively connected to the steam flow regulating valve. The temperature sensor monitors the outlet air temperature and controls the opening of the steam flow regulating valve according to the outlet air temperature, thereby adjusting the hot air drying temperature in the drying chamber accordingly.

[0025] According to the above technical solution, the temperature of the hot air generated after heat exchange by the heater can be precisely controlled in real time by controlling the steam flow rate, thereby maintaining the hot air drying temperature in the drying chamber and ensuring the drying effect on the filter cloth.

[0026] Optionally, the hot air outlet and the first air duct are located at the same vertical position or perpendicular to each other.

[0027] According to the above technical solution, a vertical filter cloth drying device with the hot air outlet and the first air duct set in the same vertical position can be installed according to different production layout requirements, or a horizontal filter cloth drying device with the hot air outlet and the first air duct set perpendicular to each other, which effectively improves the applicability of the device and reduces the corresponding cost. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the filter cloth drying device in the first embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the filter cloth drying device in the second embodiment of the present invention.

[0030] Reference numerals: Filter cloth drying device 100, cleaning device 101, frame 102, drying chamber 10, hot air inlet 11, hot air outlet 12, heater 13, steam pipe assembly 131, return water pipe assembly 132, steam flow regulating valve 133, protective cover 134, guide roller 14, baffle plate 15, filter cloth 20, first air duct 31, second air duct 32, fan 33, infrastructure platform 34, chamber roof 35, vacuum suction assembly 40, first drive component 51, second drive component 52, inlet guide 53, outlet guide 54, filter cloth drying device 200, disinfection water tank 201. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] <First Implementation Method>

[0033] refer to Figure 1 The filter cloth drying apparatus 100 of this embodiment dries the cleaned filter cloth and includes a drying chamber 10 for drying the filter cloth 20, and has a filter cloth inlet and a filter cloth outlet.

[0034] The drying chamber 10 also has a hot air inlet 11 and a hot air outlet 12 arranged opposite to each other. The hot air inlet 11 is equipped with a heater 13, and the hot air outlet 12 is connected to an air outlet guide assembly.

[0035] A hot air channel is formed between the hot air inlet 11 and the hot air outlet 12. Multiple guide rollers 14 are installed inside the drying chamber 10, and these rollers are staggered along the inner walls of both sides of the drying chamber 10. Filter cloth 20 is rolled up and laid out around the guide rollers 14 in a spread-out state, so that multiple layers of filter cloth 20 are spread out in the hot air channel. ， External air enters through heater 13 to form hot air, which is then introduced into drying chamber 10 through hot air inlet 11 to dry the multi-layered filter cloth 20 with hot air penetration, and is then guided out by air outlet guide assembly.

[0036] Specifically, multiple guide rollers 14 are staggered along the inner walls of both sides of the drying chamber 10 along the hot air channel. These rollers guide the filter cloth, allowing it to be spread over a large area and arranged in multiple layers within the drying chamber 10. During hot air penetration drying, this effectively ensures the contact area between the hot air and the filter cloth. Furthermore, multi-layered penetration drying further guarantees the drying effect of the filter cloth, effectively removing moisture, bacteria, and odors, thus ensuring the quality of soy sauce used in subsequent pressing processes. Simultaneously, it keeps the filter cloth dry and clean, slowing down corrosion and effectively extending its service life.

[0037] Furthermore, the drying chamber 10 is mounted on the frame 102, and the frame 102 supports the drying chamber 10 and other components connected to the drying chamber 10, thereby maintaining the overall stability of the device.

[0038] The air outlet guiding assembly includes a first air duct 31 connected to the hot air outlet 12, a second air duct 32 connected to the first air duct 31, and a fan 33 disposed between the first air duct 31 and the second air duct 32, and guides the hot air from the drying chamber 10 to be discharged through the fan 33.

[0039] Specifically, the operation of the fan 33 guides hot air out of the drying chamber 10, thereby increasing the hot air velocity and allowing the hot air to penetrate the filter cloth more quickly for drying, further improving drying efficiency. At the same time, it enables the formation of a stable hot air channel between the hot air inlet 11 and the hot air outlet 12 to ensure the drying effect on the multi-layered filter cloth laid out in the hot air channel.

[0040] Furthermore, the fan 33 can be installed on the infrastructure platform 34 or the workshop floor, etc. The second air duct 32 can be positioned at the top of the ceiling 35 or other locations, depending on the production layout, so as to guide and exhaust the hot air accordingly.

[0041] A baffle plate 15 is provided between the guide roller 14 and the inner wall of the adjacent drying chamber 10.

[0042] Specifically, the baffle plate 15 is filled in the gap formed between the guide roller 14 and the inner wall of the adjacent drying chamber 10, which increases the movement path of hot air in the drying chamber 10, thereby ensuring that the hot air and the filter cloth are in full contact for drying, effectively improving the drying efficiency. Furthermore, it ensures that the input hot air can penetrate the filter cloth for drying, effectively guaranteeing the drying effect.

[0043] The heater 13 has an air outlet connected to the hot air inlet 11 and an air inlet opposite to the air outlet. A heat exchange tube assembly is provided between the air inlet and the air outlet. One end of the heat exchange tube assembly is connected to a steam tube assembly 131, and the other end is connected to a return water tube assembly 132. The steam tube assembly 131 generates steam and inputs it into the heat exchange tube assembly to exchange heat with the external air. The steam then condenses into water and flows into the return water tube assembly 132.

[0044] Specifically, steam is generated by steam pipe assembly 131 and introduced into the heat exchanger tube assembly of heater 13. External air is input through the air inlet and, after heat exchange with the steam through the heat exchanger tube assembly, the heated air is delivered to the drying chamber 10 through the air outlet and hot air inlet 11 for hot air penetration drying. Simultaneously, the steam forms condensate after heat exchange, which is then recycled through the return water pipe assembly 132. Furthermore, heating air via steam heat exchange has high heat exchange efficiency, and the steam temperature can be precisely controlled by adjusting the steam flow rate and pressure, thereby precisely controlling the temperature of the hot air after heat exchange, effectively saving energy and reducing production costs.

[0045] Furthermore, a steam trap (not shown) is provided between the heater 13 and the return water pipe assembly 132. The steam trap can automatically drain the condensate in the heater 13 to prevent the condensate from accumulating, thereby ensuring the hot air heating efficiency.

[0046] Furthermore, a temperature sensor (not shown) is also provided in the first air duct 31, and a steam flow regulating valve 133 is also provided in the steam pipe group 131. The temperature sensor is communicatively or electrically connected to the steam flow regulating valve 133. The temperature sensor monitors the outlet air temperature and controls the opening degree of the steam flow regulating valve 133 according to the outlet air temperature, thereby adjusting the hot air drying temperature in the drying chamber 10 accordingly.

[0047] Specifically, after the hot air input by the hot air inlet 11 penetrates and dries the cleaned filter cloth 20, the temperature of the hot air decreases accordingly and is discharged from the hot air outlet 12 to the first air duct 31. The temperature sensor in the first air duct 31 can detect the outlet temperature of the air discharged from the hot air outlet 12. According to the outlet temperature, the opening of the steam flow regulating valve 133 can be adjusted to control the steam flow entering the heater 13, thereby controlling the temperature of the hot air after being heated by the heater 13. This can effectively save energy while ensuring the drying effect of the filter cloth.

[0048] Furthermore, the hot air drying temperature is controlled at 65℃-110℃. At the above hot air drying temperature, the moisture, bacteria and odors on the filter cloth can be effectively removed while ensuring the drying effect.

[0049] Understandably, the temperature sensor can also be set at the hot air inlet 11 to monitor the inlet air temperature of the hot air inlet 11. Based on the inlet air temperature, the opening of the steam flow regulating valve 133 can be adjusted accordingly to adjust the hot air drying temperature in the drying chamber 10.

[0050] Furthermore, the steam flow regulating valve 133 can also be connected to a controller, and the hot air drying temperature in the drying chamber 10 can be set through touch settings on the display screen.

[0051] The air inlet is also equipped with a protective cover 134.

[0052] Specifically, the protective cover 134 is a wire mesh protective cover. By setting the protective cover 134, high temperature burns can be prevented, and dust accumulation can be prevented from affecting the efficiency of hot air generation.

[0053] Furthermore, both the filter cloth inlet and outlet are sealed, and the hot air inlet 11 and outlet, as well as the hot air outlet 12 and first air duct 31 are sealed and connected, which can effectively prevent the loss of hot air and thus further ensure the drying effect.

[0054] The filter cloth inlet is also equipped with a vacuum water absorption component 40.

[0055] Specifically, the filter cloth 20 is subjected to high-pressure rinsing by the cleaning device 101. After high-pressure rinsing, the filter cloth is then transported to the drying chamber 10 for drying by the vacuum water absorption component 40 using negative pressure to absorb a large amount of water from the filter cloth, which can effectively enhance the drying efficiency of the filter cloth.

[0056] A first driving element 51 is provided on the outside of the filter cloth inlet, and a second driving element 52 is provided on the outside of the filter cloth outlet. The filter cloth is driven into the drying chamber 10 by the first driving element 51, and at the same time, the filter cloth is driven to move within the drying chamber 10 by the second driving element 52.

[0057] Specifically, the first driving component 51 is located outside the cleaning device 101. The first driving component 51 drives the filter cloth 20 to move in the cleaning device 101 for cleaning, and drives the cleaned filter cloth into the drying chamber 10. The second driving component 52 pulls the filter cloth 20 to move in the drying chamber 10. The first driving component 51 and the second driving component 52 can realize the automatic conveying of the filter cloth during the cleaning and drying process, which effectively reduces labor costs.

[0058] An inlet guide 53 is provided between the first driving component 51 and the filter cloth inlet, and an outlet guide 54 is provided between the second driving component 52 and the filter cloth outlet.

[0059] Specifically, the inlet guide 53 is aligned with the filter cloth inlet, and the outlet guide 54 is aligned with the filter cloth outlet. The inlet guide 53 and the outlet guide 54 enable the filter cloth to enter or leave the drying chamber 10 stably, preventing the filter cloth from deviating during the drying process.

[0060] Further, refer to Figure 1 In this embodiment, the filter cloth drying device 100 is a horizontal filter cloth drying device. The drying chamber 10 is arranged horizontally, and the hot air outlet 12 of the drying chamber 10 is perpendicular to the vertically arranged first air duct 31. The heater 13, hot air inlet 11, and hot air outlet 12 are all located in the same horizontal position. The inlet guide 53 and the outlet guide 54 guide the filter cloth 20 into or out of the drying chamber 10 in the vertical direction, and the guide rollers 14 arranged vertically spread the filter cloth 20 in multiple layers in the drying chamber 10. The hot air will penetrate the filter cloth 20 arranged in multiple layers in the drying chamber 10 laterally, and be discharged to the outside through the vertically arranged first air duct 31 and second air duct 32.

[0061] Further, refer to Figure 1 In this embodiment, hot air is delivered from hot air inlet 11 to hot air outlet 12, and filter cloth 20 is pulled along the hot air delivery direction by the first drive member 51 and the second drive member 52. That is, this embodiment is a co-current heat exchange design in which the hot air delivery direction is consistent with the filter cloth travel direction.

[0062] In some implementations, without affecting the production layout and installation location, a counter-current heat exchange design can be formed by changing the corresponding layout, in which the hot air delivery direction is opposite to the filter cloth travel direction. The counter-current heat exchange design is the preferred heat exchange design, and its heat exchange effect is better than that of co-current heat exchange.

[0063] The working process of the filter cloth drying device 100 in this embodiment is as follows:

[0064] The filter cloth 20 is pulled forward by the first drive member 51. After being cleaned in the cleaning device 101, it is first absorbed by the vacuum water absorption component 40 and then input into the drying chamber 10. At the same time, the filter cloth 20 is pulled forward in the drying chamber 10 by the second drive member 52. The filter cloth 20 is spread out in multiple layers inside the drying chamber 10 by multiple staggered guide rollers 14. The air entering from the outside passes through the heater 13 to form hot air. The hot air enters the drying chamber 10 and penetrates the multi-layered filter cloth 20 to dry the filter cloth 20. Under the operation of the fan 33, it is guided out through the first air duct 31 and the second air duct 32.

[0065] <Second Implementation Method>

[0066] refer to Figure 2Compared with the horizontal filter cloth drying device 100 in the first embodiment, the filter cloth drying device 200 in this embodiment has the same components as the filter cloth drying device 100, but the installation form and corresponding setting direction are different. The filter cloth drying device 200 in this embodiment is a vertical filter cloth drying device 200.

[0067] In this embodiment, the drying chamber 10 is arranged vertically. The hot air outlet 12 of the drying chamber 10 and the vertically arranged first air duct 31 are located at the same vertical position. The heater 13, hot air inlet 11, and hot air outlet 12 are all located at the same vertical position. The inlet guide 53 and the outlet guide 54 guide the filter cloth 20 into or out of the drying chamber 10 in the horizontal direction. The guide rollers 14 arranged alternately on the left and right sides spread the filter cloth 20 in multiple layers in the drying chamber 10. The hot air will vertically penetrate the filter cloth 20 that is spread in multiple layers in the drying chamber 10 and be discharged to the outside through the vertically arranged first air duct 31 and second air duct 32.

[0068] In this embodiment, the filter cloth 20, after being cleaned by the cleaning device 101, is further sterilized by the disinfection water tank 201 to prevent bacterial growth.

[0069] According to the first and second embodiments, this utility model can be installed with either a horizontally arranged filter cloth drying device 100 or a vertically arranged filter cloth drying device 200 according to different production layout requirements, which effectively improves the applicability of the device and reduces the corresponding costs.

[0070] Meanwhile, in terms of drying effect, both the horizontal filter cloth drying device 100 and the vertical filter cloth drying device 200 can achieve good filter cloth drying effect. Furthermore, when the drying chamber 10 is arranged horizontally, the filter cloth 20 can be spread in the drying chamber 10 with a larger contact area, and can achieve a better drying effect after hot air penetration.

[0071] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A filter cloth drying device for drying cleaned filter cloth, characterized in that, include: A drying chamber, used for drying the filter cloth, has a filter cloth inlet and a filter cloth outlet. The drying chamber also has a hot air inlet and a hot air outlet arranged opposite each other. The hot air inlet is equipped with a heater, and the hot air outlet is connected to an air outlet guiding component. Both the filter cloth inlet and the filter cloth outlet are sealed, and the hot air inlet and the heater, as well as the hot air outlet and the air outlet guide assembly, are sealed in communication. A hot air channel is formed between the hot air inlet and the hot air outlet. Multiple guide rollers are provided inside the drying chamber, and these rollers are staggered along the inner walls of both sides of the drying chamber. The filter cloth is rolled up and attached to the outer periphery of the guide rollers in a spread-out state, so that multiple layers of filter cloth are spread out in the hot air channel. ， External air enters and passes through the heater to form hot air, which is then introduced into the drying chamber through the hot air inlet to dry the multi-layered filter cloth. The hot air is then guided out by the air outlet guide assembly.

2. The filter cloth drying device according to claim 1, characterized in that, The filter cloth inlet is also equipped with a vacuum water absorption component.

3. The filter cloth drying device according to claim 1, characterized in that, A first driving member is provided outside the filter cloth inlet, and a second driving member is provided outside the filter cloth outlet. The filter cloth is pulled into the drying chamber by the first driving member and simultaneously moved within the drying chamber by the second driving member.

4. The filter cloth drying device according to claim 3, characterized in that, An inlet guide is provided between the first driving component and the filter cloth inlet, and an outlet guide is provided between the second driving component and the filter cloth outlet.

5. The filter cloth drying device according to claim 1, characterized in that, A baffle plate is provided between the guide roller and the inner wall of the adjacent drying chamber.

6. The filter cloth drying device according to claim 1, characterized in that, The heater has an air outlet connected to the hot air inlet and an air inlet opposite to the air outlet. A heat exchange tube assembly is provided between the air inlet and the air outlet. One end of the heat exchange tube assembly is connected to a steam tube assembly, and the other end is connected to a return water tube assembly. The steam tube assembly generates steam and inputs it into the heat exchange tube assembly to exchange heat with the incoming air. The steam then condenses into water and flows into the return water tube assembly.

7. The filter cloth drying apparatus according to claim 6, characterized in that, The air inlet is also equipped with a protective cover.

8. The filter cloth drying apparatus according to claim 7, characterized in that, The air outlet guiding assembly includes a first air duct connected to the hot air outlet, a second air duct connected to the first air duct, and a fan disposed between the first air duct and the second air duct, which guides the hot air from the drying chamber to be discharged.

9. The filter cloth drying device according to claim 8, characterized in that, The first air duct is also equipped with a temperature sensor, and the steam pipe group is also equipped with a steam flow regulating valve. The temperature sensor is communicatively connected to the steam flow regulating valve. The temperature sensor monitors the outlet air temperature and controls the opening of the steam flow regulating valve according to the outlet air temperature, thereby adjusting the hot air drying temperature in the drying chamber accordingly.

10. The filter cloth drying apparatus according to claim 8, characterized in that, The hot air outlet and the first air duct are located at the same vertical position or perpendicular to each other.

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