A drying device and a sheet drying machine

Abstract

The application discloses a drying device and a thin-plate cut tobacco dryer, and belongs to the tobacco technical field. The drying device is characterized in that the air outlet of the first heat exchanger is opposite to the air inlet of the thin-plate cut tobacco dryer body, the air outlet of the second heat exchanger is opposite to the air inlet of the first heat exchanger, the water collecting tank is provided with a water storage cavity, the first water outlet of the first heat exchanger and the second water outlet of the thin-plate cut tobacco dryer body are respectively communicated with the water storage cavity through a first pipeline, the water storage cavity is communicated with the outside through a second pipeline, the first steam port of the second heat exchanger is communicated with the water storage cavity through a third pipeline, the third water outlet of the second heat exchanger is communicated with the outside through a fourth pipeline, and the steam device is used for generating steam and is respectively communicated with the second steam port of the first heat exchanger and the third steam port of the thin-plate cut tobacco dryer body through a fifth pipeline, so that the heat of the steam formed by "flash evaporation" in the water collecting tank can be recovered. The thin-plate cut tobacco dryer can dry cut tobacco by applying the drying device.

Description

Technical Field

[0001] This application relates to the field of tobacco equipment technology, specifically to a drying device and a thin-plate drying machine. Background Technology

[0002] In the tobacco processing technology, tobacco shreds need to be dried. The tobacco shreds are baked by heating the thin plates of the thin plate drying machine with steam, and the tobacco shreds are dried by blowing hot air. This process ensures that the moisture content, filling rate and curling degree of the tobacco shreds meet the process requirements, thereby improving the physical properties and sensory quality of the tobacco shreds.

[0003] However, when the steam condenses into water after roasting the tobacco and flows into the water collection tank, the pressure drops sharply, some of the sensible heat is released and then absorbed in the form of latent heat, causing some of the condensate to be "flash evaporated" into steam and discharged directly with the condensate, resulting in a waste of heat energy.

[0004] Therefore, there is an urgent need for a drying device and a thin plate drying machine to solve the above problems. Utility Model Content

[0005] The purpose of this application is to solve or at least alleviate some or all of the aforementioned problems. Therefore, the purpose of this application is to provide a drying apparatus and a thin-plate drying machine capable of recovering the heat from the steam generated during "flash evaporation" in a water tank.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] In a first aspect, a drying apparatus is provided for supplying steam and hot air to the body of a sheet metal drying machine, comprising:

[0008] The first heat exchanger has its air outlet facing the air inlet of the thin plate wire drying machine body.

[0009] The second heat exchanger has its air outlet directly facing the air inlet of the first heat exchanger.

[0010] A water collection tank has a water storage cavity. The first drain outlet of the first heat exchanger and the second drain outlet of the thin plate wire drying machine body are respectively connected to the water storage cavity through a first pipe. The water storage cavity is connected to the outside through a second pipe. The first steam outlet of the second heat exchanger is connected to the water storage cavity through a third pipe. The third drain outlet of the second heat exchanger is connected to the outside through a fourth pipe.

[0011] A steam device for generating steam and connected to the second steam port of the first heat exchanger and the third steam port of the thin plate wire drying machine body via a fifth pipe;

[0012] A pressure regulating valve is fixedly connected to the third pipe and is used to control the amount of steam flowing from the water storage chamber through the third pipe to the first steam port.

[0013] In some embodiments, the drying apparatus further includes a controller that is communicatively connected to the pressure regulating valve and is capable of controlling the opening and closing degree of the pressure regulating valve.

[0014] In some embodiments, the thin plate wire drying machine body is provided with a first temperature measuring element for detecting the internal temperature of the thin plate wire drying machine body, and the first temperature measuring element is communicatively connected to the controller.

[0015] In some embodiments, the first heat exchanger is provided with a second temperature sensing element for detecting the internal temperature of the first heat exchanger, and the second temperature sensing element is communicatively connected to the controller.

[0016] In some embodiments, the second heat exchanger is provided with a third temperature sensing element for detecting the internal temperature of the second heat exchanger, and the third temperature sensing element is communicatively connected to the controller.

[0017] In some embodiments, the third drain outlet is connected to the second pipe via the fourth pipe.

[0018] In some embodiments, the connection point between the third pipe and the water storage cavity is higher than the connection point between the first pipe and the water storage cavity and the connection point between the second pipe and the water storage cavity.

[0019] In some embodiments, a first fan with its air inlet facing the air inlet of the first heat exchanger is fixedly connected to the air outlet of the first heat exchanger; and / or a second fan with its air inlet facing the air inlet of the second heat exchanger is fixedly connected to the air outlet of the second heat exchanger.

[0020] In some embodiments, a first filter screen is fixedly connected to the air inlet of the first heat exchanger; and / or a second filter screen is fixedly connected to the air inlet of the second heat exchanger.

[0021] Secondly, a thin plate drying machine is provided, including the thin plate drying machine body and the aforementioned drying device, wherein the air outlet of the first heat exchanger is directly opposite the air inlet of the thin plate drying machine body, and the steam device is connected to the third steam port through the fifth pipe.

[0022] The beneficial effects of this application are as follows:

[0023] The drying apparatus provided in this application has its air outlet of the first heat exchanger directly facing the air inlet of the thin-plate wire drying machine body, and its air outlet of the second heat exchanger directly facing the air inlet of the first heat exchanger. The first drain outlet of the first heat exchanger and the second drain outlet of the thin-plate wire drying machine body are respectively connected to a water storage chamber through a first pipe. The water storage chamber is connected to the outside through a second pipe. The first steam outlet of the second heat exchanger is connected to the water storage chamber through a third pipe. The third drain outlet of the second heat exchanger is connected to the outside through a fourth pipe. A steam device is used to generate steam and distributes it through a fifth pipe. The steam inlet of the first heat exchanger is not connected to the second steam port of the first heat exchanger or the third steam port of the thin-plate wire drying machine body. This allows the condensate in the first heat exchanger and the thin-plate wire drying machine body to flow into a collection tank via the first pipe and then be discharged to the external environment via the second pipe. When some of the condensate in the collection tank is flash-evaporated into steam, the steam flows into the second heat exchanger via the third pipe and exchanges heat with the room temperature air flowing into the second heat exchanger. This initial heat exchange creates semi-hot air, thus recovering the heat generated by the flash-evaporation of the condensate. The heat is recovered from the steam in the second heat exchanger, and the condensate formed is discharged into the external environment through the fourth pipe. Simultaneously, semi-hot air enters the first heat exchanger from the outlet of the second heat exchanger via the inlet, and then undergoes a second heat exchange to form hot air. The condensate formed from the steam in the first heat exchanger after heat recovery is discharged into the water collection tank through the first pipe. The hot air enters the thin-plate wire drying machine body from the outlet of the first heat exchanger via the inlet. The hot air blows... The tobacco shreds placed inside the thin plate drying machine body work together with the steam entering the thin plate drying machine body through the third steam port to dry the tobacco shreds. By fixing a pressure regulating valve to the third pipe, the steam flow into the second heat exchanger through the third pipe can be adjusted so that the semi-hot air formed by the first heat exchange in the second heat exchanger is maintained within a reasonable temperature range. In turn, the hot air formed by the semi-hot air after the second heat exchange in the first heat exchanger can be maintained within a reasonable tobacco blowing temperature range, thereby improving the drying quality of the tobacco shreds. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this application and these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the thin plate wire drying machine provided in the embodiments of this application.

[0026] Figure label:

[0027] 100. Thin plate drying machine body; 101. Second drain outlet; 102. Third steam outlet;

[0028] 1. First heat exchanger; 11. First drain outlet; 12. Second steam outlet;

[0029] 2. Second heat exchanger; 21. First steam port; 22. Third drain port;

[0030] 3. Water collection tank; 31. Water storage chamber;

[0031] 41. First pipeline; 42. Second pipeline; 43. Third pipeline; 44. Fourth pipeline; 45. Fifth pipeline;

[0032] 5. Steam device;

[0033] 6. Pressure regulating valve;

[0034] 71. First fan; 72. Second fan;

[0035] 81. First filter screen; 82. Second filter screen. Detailed Implementation

[0036] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0037] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0038] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0039] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0040] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0041] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0042] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0043] When steam condenses into water after baking tobacco and flows into the collection tank, the pressure drops sharply, releasing some sensible heat, which is then absorbed as latent heat. This causes some of the condensate to be "flash-evaporated" into steam, which is then discharged directly with the condensate, resulting in wasted heat energy. Utilizing the heat of the steam generated from the "flash-evaporation" of the condensate to heat the room temperature air can effectively recover the heat of the steam and reduce the amount of steam provided by the steam device for heating the room temperature air. The following is a detailed explanation... Figure 1 This application provides a detailed description of the drying apparatus and thin plate drying machine.

[0044] Figure 1 A schematic diagram of the thin-plate wire drying machine provided in this embodiment is shown. Figure 1 As shown, the drying device provided in this embodiment is used to provide steam and hot air to the sheet metal drying machine body 100, and includes: a first heat exchanger 1, a second heat exchanger 2, a water collection tank 3, a steam device 5, and a pressure regulating valve 6; the air outlet of the first heat exchanger 1 is directly opposite the air inlet of the sheet metal drying machine body 100; the air outlet of the second heat exchanger 2 is directly opposite the air inlet of the first heat exchanger 1; the water collection tank 3 has a water storage chamber 31, and the first drain outlet 11 of the first heat exchanger 1 and the second drain outlet 101 of the sheet metal drying machine body 100 are respectively connected to the water storage chamber 31 through a first pipe 41, storing water. The cavity 31 is connected to the outside through the second pipe 42. The first steam port 21 of the second heat exchanger 2 is connected to the water storage cavity 31 through the third pipe 43. The third drain port 22 of the second heat exchanger 2 is connected to the outside through the fourth pipe 44. The steam device 5 is used to generate steam and is connected to the second steam port 12 of the first heat exchanger 1 and the third steam port 102 of the thin plate drying machine body 100 through the fifth pipe 45 respectively. The pressure regulating valve 6 is fixedly connected to the third pipe 43 and is used to control the amount of steam flowing from the water storage cavity 31 through the third pipe 43 to the first steam port 21.

[0045] It should be noted that in the drying device of this embodiment, room temperature air flows to form room temperature wind. The room temperature wind flows into the second heat exchanger 2 through the air inlet of the second heat exchanger 2 for the first heat exchange to form hot air. However, the temperature of this hot air is not high enough to blow and dry the tobacco. In order to distinguish this hot air from the hot air with a temperature sufficient to dry the tobacco, the hot air formed by the first heat exchange through the second heat exchanger 2 is called semi-hot air. The semi-hot air flows into the first heat exchanger 1 through the air inlet of the first heat exchanger 1 for the second heat exchange to form hot air. This hot air can flow into the body 100 of the thin plate drying machine and blow and dry the tobacco.

[0046] The drying device provided in this embodiment has its air outlet of the first heat exchanger 1 directly facing the air inlet of the thin plate drying machine body 100, and its air outlet of the second heat exchanger 2 directly facing the air inlet of the first heat exchanger 1. The first drain outlet 11 of the first heat exchanger 1 and the second drain outlet 101 of the thin plate drying machine body 100 are respectively connected to the water storage chamber 31 through the first pipe 41. The water storage chamber 31 is connected to the outside through the second pipe 42. The first steam outlet 21 of the second heat exchanger 2 is connected to the water storage chamber 31 through the third pipe 43, and the third drain outlet 22 of the second heat exchanger 2 is connected to the outside through the fourth pipe 44. The steam device 5 is used... Steam is generated and connected via a fifth pipe 45 to the second steam port 12 of the first heat exchanger 1 and the third steam port 102 of the thin-plate wire drying machine body 100. This allows condensate from the first heat exchanger 1 and the thin-plate wire drying machine body 100 to flow into the water collection tank 3 via the first pipe 41 and be discharged to the external environment via the second pipe 42. When some of the condensate in the water collection tank 3 is "flash-evaporated" into steam, the steam flows into the second heat exchanger 2 via the third pipe 43 and exchanges heat with the room temperature air flowing into the second heat exchanger 2. This initial heat exchange of the room temperature air creates semi-hot air, thereby recovering the condensate. The heat from the steam generated by the "flash evaporation" of water is recovered. The condensate formed by the steam in the second heat exchanger 2 after heat recovery is discharged into the external environment through the fourth pipe 44. Simultaneously, semi-hot air enters the first heat exchanger 1 from the outlet of the second heat exchanger 2 through the inlet of the first heat exchanger 1. The semi-hot air then undergoes a second heat exchange to form hot air. The condensate formed by the steam in the first heat exchanger 1 after heat recovery is discharged into the water collection tank 3 through the first pipe 41. The hot air enters the thin plate wire drying machine body 100 from the outlet of the first heat exchanger 1 through the inlet of the thin plate wire drying machine body 100. Inside the 0, hot air blows through the tobacco shreds contained in the thin plate drying machine body 100, and works together with the steam entering the thin plate drying machine body 100 through the third steam port 102 to dry the tobacco shreds. By fixing a pressure regulating valve 6 to the third pipe 43, the steam flow rate flowing into the second heat exchanger 2 through the third pipe 43 can be adjusted, so that the semi-hot air formed by the first heat exchanger 2 after the first heat exchanger 2 heats the semi-hot air is maintained within a reasonable temperature range. In turn, the hot air formed after the second heat exchanger 1 heats the semi-hot air can be kept within the tobacco blowing temperature range, thus improving the drying quality of the tobacco shreds.

[0047] It should be noted that the range of tobacco blowing temperature is common knowledge to those skilled in the art, and they can set it reasonably according to the needs of drying tobacco, so it will not be elaborated here.

[0048] Because the thin plates of the sheet drying machine body 100 require steam heating, and hot air is also needed to blow the tobacco shreds contained within the sheet drying machine body 100, the working environment around the drying device is quite harsh for the workers, resulting in high labor intensity. To reduce the labor intensity and improve the working environment for the workers, the drying device also includes a controller. The controller is communicatively connected to the pressure regulating valve 6 and can control the opening and closing degree of the pressure regulating valve 6. This allows for remote adjustment of the opening and closing degree of the pressure regulating valve 6, thereby remotely adjusting the steam flow rate into the second heat exchanger 2 via the third pipe 43. It should be noted that the controller in the drying device provided in this embodiment can be a programmable logic controller or a computer; there is no limitation on this, as long as the controller can communicate with the pressure regulating valve 6, allowing the workers to remotely adjust the opening and closing degree of the pressure regulating valve 6.

[0049] To achieve automated control of the drying equipment and further reduce the labor intensity of workers, a first temperature measuring element is installed on the thin plate drying machine body 100 for detecting the internal temperature of the thin plate drying machine body 100. The first temperature measuring element is connected to the controller. When the first temperature measuring element detects that the internal temperature of the thin plate drying machine body 100 is too high or too low, that is, when the temperature of the hot air is not within the range of the tobacco blowing temperature, the first temperature measuring element can feed back a temperature signal to the controller. The controller can adjust the opening and closing degree of the pressure regulating valve 6 according to the temperature detected by the first temperature measuring element, thereby adjusting the steam flow rate flowing into the second heat exchanger 2 through the third pipe 43, and adjusting the temperature of the hot air to keep it within the range of the tobacco blowing temperature.

[0050] In some embodiments, a second temperature sensing element is provided on the first heat exchanger 1 for detecting the internal temperature of the first heat exchanger 1. The second temperature sensing element is communicatively connected to the controller, so that the internal temperature of the first heat exchanger 1 and the internal temperature of the thin plate drying machine body 100 can be more intuitively obtained based on the temperatures detected by the first and second temperature sensing elements. This allows the controller to know the temperature of the hot air in the first heat exchanger 1 and the thin plate drying machine body 100, so that the controller can more accurately adjust the opening and closing degree of the pressure regulating valve 6, so that the temperature of the hot air in the thin plate drying machine body 100 is within the tobacco blowing temperature range, thereby enabling better drying of the tobacco.

[0051] Preferably, the second heat exchanger 2 is provided with a third temperature sensing element for detecting the internal temperature of the second heat exchanger 2. The third temperature sensing element is communicatively connected to the controller, so that the internal temperature of the first heat exchanger 1, the internal temperature of the second heat exchanger 2 and the internal temperature of the thin plate drying machine body 100 can be more intuitively obtained based on the temperatures detected by the first temperature sensing element, the second temperature sensing element and the third temperature sensing element. This allows the controller to more accurately adjust the opening and closing degree of the pressure regulating valve 6 so that the hot air temperature inside the thin plate drying machine body 100 is within the tobacco blowing temperature range.

[0052] Continue as Figure 1 As shown, the third drain outlet 22 is connected to the second pipe 42 through the fourth pipe 44, so that the condensate formed inside the second heat exchanger 2 flows from the third drain outlet 22 through the fourth pipe 44 into the second pipe 42, and then is discharged into the external environment. Therefore, it is not necessary to set up a separate structure to connect the fourth pipe 44 to the external environment, which simplifies the structure of the drying device piping system.

[0053] In some embodiments, the connection point between the third pipe 43 and the water storage chamber 31 is higher than the connection point between the first pipe 41 and the water storage chamber 31 and the second pipe 42 and the water storage chamber 31. This allows the steam generated by "flash evaporation" in the water storage chamber 31 of the collecting tank 3 to flow from the top of the tank through the third pipe 43 into the second heat exchanger 2. At the same time, it prevents the condensate in the water storage chamber 31 of the collecting tank 3 from flowing into the second heat exchanger 2 through the third pipe 43, which would have an adverse effect on the first heat exchange.

[0054] Continue as Figure 1 As shown, a first fan 71 with an air inlet facing the air inlet of the first heat exchanger 1 is fixedly connected to the air outlet of the first heat exchanger 1, so that the second fan 72 draws in semi-hot air, increases the wind speed of semi-hot air entering the first heat exchanger 1 and the wind speed of hot air flowing out of the first heat exchanger 1, thereby improving the heat exchange efficiency of the first heat exchanger 1.

[0055] Similarly, a second fan 72 is fixedly connected to the air outlet of the second heat exchanger 2, with its air inlet facing the air inlet of the second heat exchanger 2. This allows the second fan 72 to draw in room temperature air to form room temperature air, increasing the air velocity of the room temperature air entering the second heat exchanger 2 and the air velocity of the semi-hot air flowing out of the second heat exchanger 2, thereby improving the heat exchange efficiency of the second heat exchanger 2.

[0056] Continue as Figure 1As shown, a first filter screen 81 is fixedly connected to the air inlet of the first heat exchanger 1, thereby filtering out particulate matter and impurities carried by the semi-hot air, and preventing the hot air formed by the second heat exchange of the first heat exchanger 1 from carrying particulate matter and impurities into the thin plate drying machine body 100 and contaminating the tobacco.

[0057] Similarly, a second filter screen 82 is fixedly connected to the air inlet of the second heat exchanger 2, thereby filtering particulate matter and impurities carried by the room temperature air, preventing the semi-hot air formed by the first heat exchange of the second heat exchanger 2 from carrying particulate matter and impurities into the second heat exchanger 2 and then flowing into the thin plate drying machine body 100 and contaminating the tobacco.

[0058] This embodiment also provides a thin plate tobacco drying machine, including a thin plate tobacco drying machine body 100 and the above-mentioned drying device. The air outlet of the first heat exchanger 1 is directly opposite the air inlet of the thin plate tobacco drying machine body 100. The steam device 5 is connected to the third steam port 102 through the fifth pipe 45, so that the drying device can provide steam and hot air to the thin plate tobacco drying machine to dry tobacco shreds, and can also recover and utilize the heat of the steam formed by "flash evaporation" in the water collection tank 3.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A drying device for providing steam and hot air for a cut tobacco sheet maker body (100), characterized in that, include: The first heat exchanger (1) has its air outlet facing the air inlet of the thin plate wire drying machine body (100). The second heat exchanger (2) has its air outlet facing the air inlet of the first heat exchanger (1). A water collection tank (3) has a water storage chamber (31). The first drain outlet (11) of the first heat exchanger (1) and the second drain outlet (101) of the thin plate wire drying machine body (100) are connected to the water storage chamber (31) through a first pipe (41). The water storage chamber (31) is connected to the outside through a second pipe (42). The first steam outlet (21) of the second heat exchanger (2) is connected to the water storage chamber (31) through a third pipe (43). The third drain outlet (22) of the second heat exchanger (2) is connected to the outside through a fourth pipe (44). Steam device (5), which generates steam and is connected to the second steam port (12) of the first heat exchanger (1) and the third steam port (102) of the thin plate wire drying machine body (100) respectively through the fifth pipe (45); A pressure regulating valve (6) is fixedly connected to the third pipe (43) and is used to control the amount of steam flowing from the water storage chamber (31) through the third pipe (43) to the first steam port (21).

2. The drying apparatus according to claim 1, characterized in that, The drying device also includes a controller, which is communicatively connected to the pressure regulating valve (6) and can control the opening and closing degree of the pressure regulating valve (6).

3. The drying apparatus according to claim 2, characterized in that, The thin plate wire drying machine body (100) is provided with a first temperature measuring element for detecting the internal temperature of the thin plate wire drying machine body (100), and the first temperature measuring element is communicatively connected to the controller.

4. The drying apparatus according to claim 3, characterized in that, The first heat exchanger (1) is provided with a second temperature measuring element for detecting the internal temperature of the first heat exchanger (1), and the second temperature measuring element is communicatively connected to the controller.

5. The drying apparatus according to claim 4, characterized in that, The second heat exchanger (2) is provided with a third temperature measuring element for detecting the internal temperature of the second heat exchanger (2), and the third temperature measuring element is communicatively connected to the controller.

6. The drying apparatus according to claim 1, characterized in that, The third drain outlet (22) is connected to the second pipe (42) through the fourth pipe (44).

7. The drying apparatus according to claim 6, characterized in that, The connection point between the third pipe (43) and the water storage cavity (31) is higher than the connection point between the first pipe (41) and the water storage cavity (31) and the connection point between the second pipe (42) and the water storage cavity (31).

8. The drying apparatus according to any one of claims 1-7, characterized in that, A first fan (71) with its air inlet facing the air inlet of the first heat exchanger (1) is fixedly connected to the air outlet of the first heat exchanger (1); and / or a second fan (72) with its air inlet facing the air inlet of the second heat exchanger (2) is fixedly connected to the air outlet of the second heat exchanger (2).

9. The drying apparatus according to any one of claims 1-7, characterized in that, A first filter screen (81) is fixedly connected to the air inlet of the first heat exchanger (1); and / or a second filter screen (82) is fixedly connected to the air inlet of the second heat exchanger (2).

10. A thin plate wire drying machine, characterized in that, Includes the thin plate drying machine body (100) and the drying device as described in any one of claims 1-9, wherein the air outlet of the first heat exchanger (1) is directly opposite the air inlet of the thin plate drying machine body (100), and the steam device (5) is connected to the third steam port (102) through the fifth pipe (45).

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