Heat exchanger and thin-plate cut-tobacco drier

Abstract

The utility model belongs to the technical field of heat exchange, and discloses a heat exchanger and a thin-plate cut tobacco dryer. The heat exchanger is used for recycling heat of condensate water discharged by the thin-plate cut-tobacco dryer, an air inlet and an air outlet are formed in the shell, the air outlet directly faces an air inlet of the hot air heat exchanger of the thin-plate cut-tobacco dryer, an inlet of the heat exchange pipe is communicated with a water inlet pipe, and a water outlet of the heat exchange pipe is communicated with a water outlet pipe. The inlet of the water inlet pipe is communicated with the discharge outlet of the condensate water recovery system of the thin-plate cut-tobacco dryer, and the outlet of the water outlet pipe is communicated with the outside, so that heat of condensate water discharged by the thin-plate cut-tobacco dryer can be recovered, and the drying cost of cut tobacco is further reduced. The thin-plate cut-tobacco drier comprises the heat exchanger, the steam preparation amount needed by the thin-plate cut-tobacco drier for drying cut tobacco can be reduced, and then the drying cost of the cut tobacco is reduced.

Description

A heat exchanger and a thin plate wire drying machine Technical Field

[0001] This utility model relates to the field of heat exchange technology, and in particular to a heat exchanger and a thin plate wire drying machine. Background Technology

[0002] In the tobacco processing technology, a thin plate drying machine is used to dry the cut tobacco shreds so 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] Thin plate drying machines require a large amount of steam to obtain the hot air needed for drying tobacco shreds. The production of steam leads to high drying costs for tobacco shreds. After the steam heats the room temperature air, it condenses into water. The condensate is then recovered by the condensate recovery system of the thin plate drying machine. However, the condensate recovery system has back pressure, which leads to poor condensate drainage. In order to ensure the stability of the tobacco drying quality of the thin plate drying machine, the condensate is directly discharged. Therefore, the condensate cannot be effectively recovered and reused. Moreover, the condensate has a high temperature, and the heat it contains cannot be recovered and reused, resulting in a waste of heat.

[0004] Therefore, there is an urgent need for a heat exchanger and a thin-plate wire drying machine to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a heat exchanger and a thin-plate tobacco drying machine that can recover and reuse the heat of the condensate discharged from the thin-plate tobacco drying machine, while reducing the drying cost of tobacco.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, a heat exchanger is provided for recovering heat from the condensate discharged from a thin-plate wire drying machine, the heat exchanger comprising:

[0008] The housing has a receiving cavity inside, and an air inlet and an air outlet are respectively opened on the housing. The air inlet and the air outlet are respectively connected to the receiving cavity, and the air outlet is directly opposite the air inlet of the hot air heat exchanger of the thin plate wire drying machine.

[0009] A heat exchange module is disposed within the receiving cavity. The heat exchange module includes a water inlet pipe, a heat exchange tube, and a water outlet pipe. The inlet of the heat exchange tube is connected to the water inlet pipe, and the outlet of the heat exchange tube is connected to the water outlet pipe. The inlet of the water inlet pipe is connected to the discharge port of the condensate recovery system of the thin plate wire drying machine, and the outlet of the water outlet pipe is connected to the outside.

[0010] Preferably, the heat exchange module includes at least two heat exchange tubes, which are arranged at intervals.

[0011] Preferably, the heat exchange tube has N water supply pipes, the outlet of the (N-1)th water supply pipe is connected to the inlet of the Nth water supply pipe, the N water supply pipes are arranged in parallel, the inlet of the first water supply pipe serves as the inlet of the heat exchange tube, and the outlet of the Nth water supply pipe serves as the outlet of the heat exchange tube.

[0012] Preferably, the heat exchange module further includes a heat dissipation component, which is fixedly connected to the housing and located within the receiving cavity. The heat dissipation component has a through hole facing the water supply pipe, through which the water supply pipe passes and contacts the heat dissipation component.

[0013] Preferably, the heat exchange module includes at least two heat dissipation components, which are spaced apart along the length of the water supply pipe.

[0014] Preferably, the heat exchanger further includes a condensate inlet / outlet assembly, the condensate inlet / outlet assembly comprising:

[0015] The drain pipe is arranged vertically, with its inlet connected to the discharge port of the condensate recovery system of the thin plate wire drying machine, and its outlet connected to the outside.

[0016] A condensate inlet pipe is provided, the inlet of which is connected to the drain pipe, and the outlet of which is connected to the inlet of the water inlet pipe.

[0017] A condensate outlet pipe is provided, the outlet of which is connected to the drain pipe, and the inlet of which is connected to the outlet of the drain pipe. The condensate inlet pipe and the condensate outlet pipe are arranged at intervals in the vertical direction.

[0018] A first valve is installed on the drain pipe and is located between the connection point of the condensate inlet pipe and the drain pipe and the connection point of the condensate outlet pipe and the drain pipe.

[0019] Preferably, a first flow valve is provided on the condensate inlet pipe and / or a second flow valve is provided on the condensate outlet pipe, thereby...

[0020] Preferably, a drain cover is coaxially provided at one end of the outlet of the drain pipe.

[0021] Preferably, a first temperature measuring element is provided on the condensate inlet pipe, and a second temperature measuring element is provided on the condensate outlet pipe.

[0022] Preferably, the heat exchanger further includes a rotor, the shaft of which is rotatably connected to the housing, the outlet of the condensate inlet pipe is connected to the inlet of the water inlet pipe via a water delivery hose, and the inlet of the condensate outlet pipe is connected to the outlet of the water outlet pipe via a water delivery hose.

[0023] Preferably, the heat exchanger further includes a filter screen, which is detachably installed on the housing and used to shield the air inlet.

[0024] Preferably, a through hole is provided on the side wall of the housing corresponding to the air outlet, and a third temperature measuring element is fixed at the through hole, which can detect the temperature at the air outlet.

[0025] Secondly, a thin plate wire drying machine is provided, including the above-mentioned heat exchanger, characterized in that the air inlet of the hot air heat exchanger of the thin plate wire drying machine is directly opposite the air outlet, and the inlet of the water inlet pipe is connected to the condensate discharge outlet of the thin plate wire drying machine.

[0026] The beneficial effects of this utility model are:

[0027] The heat exchanger provided by this utility model arranges the heat exchange module within the housing cavity, and provides an air inlet and an air outlet on the housing. The air outlet faces the air inlet of the hot air heat exchanger of the thin-plate wire drying machine. The inlet of the heat exchange tube is connected to the water inlet pipe, and the outlet of the heat exchange tube is connected to the water outlet pipe. The inlet of the water inlet pipe is connected to the discharge port of the condensate recovery system of the thin-plate wire drying machine, and the outlet of the water outlet pipe is connected to the outside. This allows the condensate discharged from the thin-plate wire drying machine to flow from the water inlet pipe into the heat exchange tube and interact with the heat exchanger. The room temperature air in the housing cavity of the heat exchanger undergoes heat exchange to heat the room temperature air, and then flows out to the outside through the water outlet pipe, thereby recovering the heat of the condensate discharged by the thin plate drying machine. The room temperature air can flow into the housing cavity from the air inlet of the housing, and after exchanging heat with the condensate in the heat exchange tube, it flows into the air inlet of the hot air heat exchanger of the thin plate drying machine through the air outlet, thereby providing hot air for the thin plate drying machine, reducing the amount of steam required for the thin plate drying machine to dry tobacco, and thus reducing the drying cost of tobacco.

[0028] The thin-plate tobacco drying machine provided by this utility model includes the above-mentioned heat exchanger, which can reduce the amount of steam required for drying tobacco, thereby reducing the drying cost of tobacco. Attached Figure Description

[0029] Figure 1 is a schematic diagram of the heat exchanger provided in an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of the structure of the shell provided in an embodiment of the present utility model;

[0031] Figure 3 is a structural schematic diagram of the heat exchange module provided in an embodiment of this utility model;

[0032] Figure 4 is a schematic diagram of the structure of the condensate inlet and outlet assembly provided in an embodiment of this utility model.

[0033] In the picture:

[0034] 1. Housing; 11. Receiving cavity; 12. Air inlet; 13. Air outlet;

[0035] 2. Heat exchange module; 21. Water inlet pipe; 22. Heat exchange tube; 221. Water supply pipe; 23. Water outlet pipe; 24. Heat dissipation component;

[0036] 3. Condensate inlet / outlet assembly; 31. Drain pipe; 32. Condensate inlet pipe; 33. Condensate outlet pipe;

[0037] 34. First valve; 35. First flow valve; 36. Second flow valve; 37. Floor drain cover; 38. First temperature sensing element; 39. Second temperature sensing element;

[0038] 4. Rotary wheel;

[0039] 5. Filter screen;

[0040] 6. Third temperature sensing element. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0042] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0045] The thin plate drying machine requires a large amount of steam to obtain the hot air needed to dry tobacco shreds. The production of steam leads to high drying costs for tobacco shreds. After the steam heats the room temperature air, it condenses into water. However, the condensate recovery system directly discharges the condensate, which cannot effectively recover and reuse the heat contained in the condensate. Therefore, recovering the heat contained in the condensate is the key to reducing the drying cost of tobacco shreds. The heat exchanger and thin plate drying machine provided in this embodiment will be described in detail below with reference to Figures 1 to 4.

[0046] Figure 1 shows a schematic diagram of the heat exchanger provided in this embodiment. Figure 2 shows a schematic diagram of the housing 1 provided in this embodiment. Figure 3 shows a schematic diagram of the heat exchange module 2 provided in this embodiment. As shown in Figures 1 to 3, the heat exchanger provided in this embodiment is used to recover the heat of the condensate discharged from the thin plate wire drying machine. The heat exchanger includes a shell 1 and a heat exchange module 2. The shell 1 is provided with a receiving cavity 11. An air inlet 12 and an air outlet 13 are respectively opened on the shell 1. The air inlet 12 and the air outlet 13 are respectively connected to the receiving cavity 11. The air outlet 13 is directly opposite the air inlet of the hot air heat exchanger of the thin plate wire drying machine. The heat exchange module 2 is disposed in the receiving cavity 11. The heat exchange module 2 includes a water inlet pipe 21, a heat exchange pipe 22 and a water outlet pipe 23. The inlet of the heat exchange pipe 22 is connected to the water inlet pipe 21, and the outlet of the heat exchange pipe 22 is connected to the water outlet pipe 23. The inlet of the water inlet pipe 21 is connected to the discharge port of the condensate recovery system of the thin plate wire drying machine, and the outlet of the water outlet pipe 23 is connected to the outside. It should be noted that an exhaust fan is installed in the air inlet of the hot air heat exchanger of the thin plate wire drying machine. Since the air inlet 12 of the shell 1 of the heat exchanger is directly opposite the air inlet of the hot air heat exchanger of the thin plate wire drying machine, the exhaust fan can draw in room temperature air to form room temperature air. The room temperature air flows from the air inlet 12 of the shell 1 into the receiving cavity 11, and after heat exchange with the condensate in the heat exchange tube 22, it flows into the air inlet of the hot air heat exchanger of the thin plate wire drying machine through the air outlet 13.

[0047] In this embodiment, the air inlet 12 of the housing 1 is positioned directly opposite the air outlet 13. This shortens the flow path of room temperature air from the air inlet 12 of the housing 1 into the receiving cavity 11 and then through the air outlet 13 into the air inlet of the hot air heat exchanger of the thin plate wire drying machine when the air outlet 13 is directly opposite the air inlet of the hot air heat exchanger of the thin plate wire drying machine. This facilitates the extraction of more room temperature air by the exhaust fan in the air inlet of the hot air heat exchanger of the thin plate wire drying machine, thereby increasing the flow rate of the room temperature air and improving the heat exchange efficiency of the heat exchanger.

[0048] The heat exchanger provided in this embodiment places the heat exchange module 2 inside the receiving cavity 11 of the housing 1, and opens an air inlet 12 and an air outlet 13 on the housing 1, so that the air outlet 13 is directly opposite the air inlet of the hot air heat exchanger of the thin plate wire drying machine. The inlet of the heat exchange tube 22 is connected to the water inlet pipe 21, and the water outlet of the heat exchange tube 22 is connected to the water outlet pipe 23. The inlet of the water inlet pipe 21 is connected to the discharge port of the condensate recovery system of the thin plate wire drying machine, and the outlet of the water outlet pipe 23 is connected to the outside, so that the condensate discharged by the thin plate wire drying machine can flow from the water inlet pipe 21 into the heat exchange tube 22. Inside the shell 1, the room temperature air is heated by heat exchange with the room temperature air in the cavity 11 of the heat exchanger shell 1, and then flows out to the outside through the water outlet pipe 23, thereby recovering the heat of the condensate discharged by the thin plate drying machine. The room temperature air can flow into the cavity 11 from the air inlet 12 of the shell 1, and after heat exchange with the condensate in the heat exchange tube 22, it flows into the air inlet of the hot air heat exchanger of the thin plate drying machine through the air outlet 13, thereby providing hot air for the thin plate drying machine, reducing the amount of steam required for the thin plate drying machine to dry tobacco, and thus reducing the drying cost of tobacco.

[0049] As shown in Figure 2 in conjunction with Figure 1, the heat exchanger also includes a filter screen 5. The filter screen 5 is detachably installed on the housing 1 and is used to cover the air inlet 12. This allows it to filter particulate matter contained in the room temperature air as it flows from the air inlet 12 of the housing 1 into the receiving cavity 11, preventing particulate matter from entering the hot air heat exchanger inlet of the thin-plate tobacco drying machine and contaminating the hot air used for drying tobacco. Specifically, the detachable connection method between the filter screen 5 and the housing 1 is not limited here; it can be a pivot connection, a threaded connection, or a snap-fit ​​connection, as long as the filter screen 5 is detachably installed on the housing 1 and covers the air inlet 12, and can filter particulate matter contained in the room temperature air.

[0050] In this embodiment, one end of the filter screen 5 is pivotally connected to the housing 1. The two filter screens 5 are respectively disposed on the two corresponding side walls of the air inlet 12. The two filter screens 5 can form a double door. When the heat exchanger is used to recover the heat of the condensate discharged from the thin plate drying machine, the filter screen 5 blocks the air inlet 12 and filters the particulate matter contained in the room temperature air. When the heat exchanger malfunctions, the filter screen 5 can be opened to repair the heat exchange module 2 disposed in the housing 1.

[0051] As shown in Figure 3, the heat exchange module 2 includes at least two heat exchange tubes 22, which are arranged at intervals to allow the heat exchange tubes 22 to simultaneously deliver a larger flow rate of condensate, thereby improving the heat exchange efficiency between the condensate in the heat exchange tubes 22 and the room temperature air in the receiving cavity 11. It should be noted that the number of heat exchange tubes 22 in the heat exchange module 2 can be 2, 5, 10, 20, 50, or even more. The more heat exchange tubes 22 the heat exchange module 2 has, the higher the heat exchange efficiency between the condensate in the heat exchange tubes 22 and the room temperature air in the receiving cavity 11. Those skilled in the art can reasonably set the number of tubes 22 according to the actual heat exchange efficiency requirements of the heat exchanger.

[0052] In this embodiment, the heat exchange module 2 includes 50 heat exchange tubes 22, which are arranged at intervals in a vertical direction, so that the condensate in the water inlet pipe 21 can flow into the 50 heat exchange tubes 22 at the same time, thereby increasing the volume of condensate that exchanges heat with the room temperature air in the receiving cavity 11, and thus improving the heat exchange efficiency between the condensate in the heat exchange tubes 22 and the room temperature air in the receiving cavity 11.

[0053] Continuing as shown in Figure 3, the heat exchange tube 22 has N (N≥2) water supply pipes 221. The outlet of the (N-1)th water supply pipe 221 is connected to the inlet of the Nth water supply pipe 221. The N water supply pipes 221 are arranged side by side. The inlet of the first water supply pipe 221 serves as the inlet of the heat exchange tube 22, and the outlet of the Nth water supply pipe 221 serves as the outlet of the heat exchange tube 22. This extends the flow path of the condensate in the receiving cavity 11, further improving the heat exchange efficiency between the condensate in the heat exchange tube 22 and the room temperature air in the receiving cavity 11. It should be noted that the number of water supply pipes 221 in the heat exchange tube 22 in this embodiment can be 2, 3, 4, 10, or even more. Those skilled in the art can reasonably set the number according to the actual heat exchange efficiency requirements of the heat exchanger.

[0054] In this embodiment, the heat exchange tube 22 has two water supply pipes 221. The outlet of the first water supply pipe 221 is connected to the inlet of the second water supply pipe 221. The two water supply pipes 221 are arranged side by side. The inlet of the first water supply pipe 221 serves as the inlet of the heat exchange tube 22, and the outlet of the second water supply pipe 221 serves as the outlet of the heat exchange tube 22. By extending the flow path of the condensate in the receiving cavity 11, the heat exchange efficiency between the condensate in the heat exchange tube 22 and the room temperature air in the receiving cavity 11 is improved.

[0055] The heat from the condensate in the water pipe 221 is transferred to the water pipe 221, and then heats the room temperature air in the receiving cavity 11 to complete the heat exchange between the condensate in the heat exchange tube 22 and the room temperature air in the receiving cavity 11. Therefore, increasing the contact area between the water pipe 221 and the room temperature air is beneficial to improving the heat exchange efficiency between the condensate in the heat exchange tube 22 and the room temperature air in the receiving cavity 11. As shown in Figure 3 in conjunction with Figure 1, the heat exchange module 2 also includes a heat sink 24. The heat sink 24 is fixedly connected to the housing 1 and located in the receiving cavity 11. The heat sink 24 has a through hole facing the water pipe 221. The water pipe 221 passes through the through hole and contacts the heat sink 24, so that the heat from the condensate in the water pipe 221 is transferred to the water pipe 221 and then to the heat sink 24, thereby increasing the contact area between the water pipe 221 and the room temperature air in the receiving cavity 11 and improving the heat exchange efficiency between the condensate in the heat exchange tube 22 and the room temperature air in the receiving cavity 11.

[0056] Specifically, the heat sink 24 can be a heat sink fin or a heat sink block. The housing 1 has a first connecting hole, and the heat sink 24 has a first fixing hole. A first locking member passes through the first connecting hole and engages with the first fixing hole to fix the heat sink 24 to the housing 1. In this embodiment, the heat sink 24 is a heat sink fin. The surface of the heat sink fin has a through hole facing the water pipe 221. The first connecting hole is a through hole, the first fixing hole is a threaded hole, and the first locking member is a bolt. The bolt passes through the through hole and engages with the threaded hole to fix the heat sink to the housing 1.

[0057] Preferably, the heat exchange module 2 includes at least two heat dissipation components 24, which are spaced apart along the length of the water supply pipe 221. This further increases the contact area between the water supply pipe 221 and the room temperature air in the receiving cavity 11, thereby improving the heat exchange efficiency between the condensate in the heat exchange pipe 22 and the room temperature air in the receiving cavity 11. It should be noted that the number of heat dissipation components 24 in the heat exchange module 2 can be 2, 3, 4, 10, 50, or even more, and those skilled in the art can reasonably set them according to the actual heat exchange efficiency requirements of the heat exchanger.

[0058] In this embodiment, the heat exchange module 2 includes at least 50 heat dissipation components 24. The 50 heat dissipation components 24 are spaced apart along the length of the water supply pipe 221, thereby further increasing the contact area between the water supply pipe 221 and the room temperature air in the accommodating cavity 11, thereby improving the heat exchange efficiency between the condensate in the heat exchange pipe 22 and the room temperature air in the accommodating cavity 11.

[0059] The thin-plate drying machine does not continuously dry tobacco shreds; instead, it is started and stopped periodically according to the work schedule of the staff. When the thin-plate drying machine is stopped and no longer running, it stops discharging condensate. At the same time, condensate will remain in the inlet pipe 21, heat exchange tube 22, and outlet pipe 23 of the heat exchanger module 2. When the thin-plate drying machine is restarted and condensate is discharged into the inlet pipe 21 of the heat exchanger, the condensate remaining in the inlet pipe 21, heat exchange tube 22, and outlet pipe 23 will experience water hammer due to the sudden change in flow rate, causing violent pressure fluctuations and damaging the pipeline system. Therefore, to solve the above technical problems, Figure 4 shows a schematic diagram of the condensate inlet and outlet assembly 3 provided in this embodiment. As shown in Figure 4 in conjunction with Figure 1, the heat exchanger provided in this embodiment also includes a condensate inlet / outlet assembly 3. The condensate inlet / outlet assembly 3 includes a drain pipe 31, a condensate inlet pipe 32, a condensate outlet pipe 33, and a first valve 34. The drain pipe 31 is arranged vertically, with its inlet connected to the discharge port of the condensate recovery system of the thin plate drying machine, and its outlet connected to the outside. The inlet of the condensate inlet pipe 32 is connected to the drain pipe 31, and its outlet is connected to the inlet of the water inlet pipe 21. The outlet of the condensate outlet pipe 33 is connected to the drain pipe 31, and its inlet is connected to the outlet of the water outlet pipe 23. The condensate inlet pipe 32 and the condensate outlet pipe 33 are spaced apart vertically. The first valve 34 is located on the drain pipe 31 and is situated on the condensate inlet / outlet. Between the water inlet pipe 32 and the drain pipe 31 and the condensate outlet pipe 33 and the drain pipe 31, the first valve 34 can be opened before starting the heat exchanger to dry tobacco using the thin plate drying machine. This allows the condensate remaining in the drain pipe 31, condensate inlet pipe 32, condensate outlet pipe 33, water inlet pipe 21, heat exchange pipe 22, and water outlet pipe 23 to be discharged to the outside from the outlet end of the drain pipe 31 due to gravity. This prevents water hammer caused by a sudden change in flow rate of the condensate remaining in the drain pipe 31, condensate inlet pipe 32, condensate outlet pipe 33, water inlet pipe 21, heat exchange pipe 22, and water outlet pipe 23 when condensate is introduced into the heat exchange module 2 of the heat exchanger. This protects the piping system of the thin plate drying machine and the heat exchanger from damage due to water hammer.

[0060] Preferably, a drain cover 37 is coaxially provided at the outlet end of the drain pipe 31, so that when condensate is discharged from the outlet end of the drain pipe 31 to the outside, it is blocked by the drain cover 37 and will not splash onto the workers working near the thin plate drying machine.

[0061] Continuing with Figure 4 and in conjunction with Figure 1, the condensate inlet / outlet assembly 3 also includes a first flow valve 35, which is installed on the condensate inlet pipe 32. Adjusting the first flow valve 35 controls the flow rate of condensate flowing from the condensate inlet pipe 32 into the inlet pipe 21, thereby adjusting the heat exchange efficiency between the condensate in the heat exchange tube 22 and the room temperature air in the receiving cavity 11. Similarly, the condensate inlet / outlet assembly 3 also includes a second flow valve 36, which is installed on the condensate outlet pipe 33. Adjusting the second flow valve 36 controls the flow rate of condensate flowing from the outlet pipe 23 into the condensate outlet pipe 33, thereby adjusting the heat exchange efficiency between the condensate in the heat exchange tube 22 and the room temperature air in the receiving cavity 11.

[0062] After prolonged use of the heat exchanger to recover the heat from the condensate discharged by the thin plate wire drying machine, leaks inevitably occur in the water inlet pipe 21, heat exchange tube 22, and water outlet pipe 23 of the heat exchange module 2. This leads to a decrease in the heat exchange efficiency between the condensate in the heat exchange tube 22 and the room temperature air in the receiving cavity 11. However, it is difficult for staff to detect the decrease in the heat exchange efficiency between the condensate in the heat exchange tube 22 and the room temperature air in the receiving cavity 11. To address the aforementioned technical issues, as shown in the figure, the condensate inlet / outlet assembly 3 further includes a first temperature sensing element 38 and a second temperature sensing element 39. The first temperature sensing element 38 is installed on the condensate inlet pipe 32 to detect the temperature of the condensate inside the condensate inlet pipe 32. The second temperature sensing element 39 is installed on the condensate outlet pipe 33 to detect the temperature of the condensate inside the condensate outlet pipe 33. This allows for the calculation of the difference between the temperatures of the condensate in the condensate inlet pipe 32 and the condensate outlet pipe 33, and continuous monitoring of any changes in this difference. This helps determine if there is a pipeline leak in the heat exchange module 2 of the heat exchanger. When the temperature difference between the condensate inlet pipe 32 and the condensate outlet pipe 33 decreases, it indicates a malfunction in the heat exchange module 2, leading to a reduction in the heat exchange efficiency between the condensate in the heat exchange tube 22 and the ambient air in the containment cavity 11. This necessitates maintenance of the heat exchanger, thereby improving its operational reliability.

[0063] Preferably, the heat exchanger also includes a rotor 4, the shaft of which is rotatably connected to the housing 1. The outlet of the condensate inlet pipe 32 is connected to the inlet of the water inlet pipe 21 via a water supply hose, and the inlet of the condensate outlet pipe 33 is connected to the outlet of the water outlet pipe 23 via a water supply hose. Thus, when the steam condensate discharge of the thin plate wire drying machine fluctuates significantly, causing the room temperature air to exchange heat with the condensate in the heat exchange tube 22 and then flow into the hot air heat exchanger inlet of the thin plate wire drying machine at an unstable air temperature, resulting in unstable hot air temperature control of the thin plate wire drying machine, the operator can push the heat exchanger so that the air outlet 13 of the heat exchanger housing 1 is no longer directly facing the hot air heat exchanger inlet of the thin plate wire drying machine, stopping the supply of hot air to the thin plate wire drying machine. After the condensate discharge of the thin plate wire drying machine returns to normal, the operator pushes the heat exchanger so that the air outlet 13 of the housing 1 is directly facing the hot air heat exchanger inlet of the thin plate wire drying machine again, continuing to supply hot air to the thin plate wire drying machine. Specifically, the wheel 4 can be a caster or a wheel, as long as its shaft can be rotated and installed on the heat exchanger housing 1 so that the operator can push the heat exchanger.

[0064] In this embodiment, the wheel 4 is a movable caster with a brake, so that when using the heat exchanger to recover the heat of the condensate discharged from the thin plate drying machine, the brake can be opened to prevent the heat exchanger from moving during use and causing the air outlet 13 of the heat exchanger shell 1 to no longer be directly opposite the air inlet of the hot air heat exchanger of the thin plate drying machine. When it is necessary to push the heat exchanger, the brake can be closed to push the heat exchanger.

[0065] In some embodiments, a through hole is provided on the side wall of the housing 1 corresponding to the air outlet 13, and a third temperature measuring element 6 is fixed at the through hole. The third temperature measuring element 6 can detect the temperature at the air outlet 13, thereby monitoring whether the inlet air temperature flowing into the hot air heat exchanger of the thin plate wire drying machine is stable. When the inlet air temperature is unstable, the operator can push the heat exchanger so that the air outlet 13 of the housing 1 of the heat exchanger is no longer directly facing the air outlet of the hot air heat exchanger of the thin plate wire drying machine, and stop supplying hot air to the thin plate wire drying machine.

[0066] This embodiment also provides a thin-plate drying machine, which includes a heat exchanger, a hot air heat exchanger inlet, and a condensate outlet. The hot air heat exchanger inlet of the thin-plate drying machine is directly opposite the air outlet 13 of the heat exchanger shell 1. The inlet of the water inlet pipe 21 of the heat exchanger module 2 is connected to the condensate outlet of the thin-plate drying machine, thereby enabling the recovery and reuse of the heat contained in the discharged condensate and reducing the drying cost of tobacco.

[0067] This embodiment also provides a heat exchange method in which the condensate discharged from the condensate drain of the thin plate drying machine enters the heat exchange tube 22 of the heat exchanger and exchanges heat with the room temperature air. The room temperature air after heat exchange flows into the air inlet of the hot air heat exchanger of the thin plate drying machine, thereby recovering and reusing the heat of the condensate discharged from the thin plate drying machine and reducing the drying cost of tobacco.

[0068] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A heat exchanger for recovering the heat from the condensate discharged from a thin sheet wire drying machine, characterized in that, The heat exchanger includes: a shell (1), a receiving cavity (11) is provided inside the shell (1), an air inlet (12) and an air outlet (13) are respectively opened on the shell (1), the air inlet (12) and the air outlet (13) are respectively connected to the receiving cavity (11), and the air outlet (13) is directly opposite to the air inlet of the hot air heat exchanger of the thin plate wire drying machine; a heat exchange module (2), the heat exchange module (2) is disposed in the receiving cavity (11), the heat exchange module (2) includes a water inlet pipe (21), a heat exchange pipe (22) and a water outlet pipe (23), the inlet of the heat exchange pipe (22) is connected to the water inlet pipe (21), the outlet of the heat exchange pipe (22) is connected to the water outlet pipe (23), the inlet of the water inlet pipe (21) is connected to the discharge port of the condensate recovery system of the thin plate wire drying machine, and the outlet of the water outlet pipe (23) is connected to the outside.

2. The heat exchanger according to claim 1, characterized in that, The heat exchange module (2) includes at least two heat exchange tubes (22), which are arranged at intervals.

3. The heat exchanger according to claim 2, characterized in that, The heat exchange tube (22) has N water supply pipes (221). The outlet of the (N-1)th water supply pipe (221) is connected to the inlet of the Nth water supply pipe (221). The N water supply pipes (221) are arranged in parallel. The inlet of the first water supply pipe (221) serves as the inlet of the heat exchange tube (22), and the outlet of the Nth water supply pipe (221) serves as the outlet of the heat exchange tube (22).

4. The heat exchanger according to claim 3, characterized in that, The heat exchange module (2) also includes a heat sink (24), which is fixedly connected to the housing (1) and located in the receiving cavity (11). The heat sink (24) has a through hole facing the water supply pipe (221), and the water supply pipe (221) passes through the through hole and contacts the heat sink (24).

5. The heat exchanger according to claim 4, characterized in that, The heat exchange module (2) includes at least two heat dissipation components (24), which are spaced apart along the length of the water supply pipe (221).

6. The heat exchanger according to claim 1, characterized in that, The heat exchanger also includes a condensate inlet / outlet assembly (3), which includes: a drain pipe (31) arranged vertically, the inlet of which is connected to the discharge port of the condensate recovery system of the thin plate wire drying machine, and the outlet of which is connected to the outside; a condensate inlet pipe (32) connected to the drain pipe (31), and the outlet of which is connected to the inlet of the water inlet pipe (21); and a condensate outlet pipe (32). Pipe (33), the outlet of the condensate outlet pipe (33) is connected to the drain pipe (31), the inlet of the condensate outlet pipe (33) is connected to the outlet of the water outlet pipe (23), the condensate inlet pipe (32) and the condensate outlet pipe (33) are arranged at intervals in the vertical direction; first valve (34), the first valve (34) is arranged on the drain pipe (31) and is located between the connection between the condensate inlet pipe (32) and the drain pipe (31) and the connection between the condensate outlet pipe (33) and the drain pipe (31).

7. The heat exchanger according to claim 6, characterized in that, A first flow valve (35) is provided on the condensate inlet pipe (32) and / or a second flow valve (36) is provided on the condensate outlet pipe (33).

8. The heat exchanger according to claim 6, characterized in that, A floor drain cover (37) is also coaxially installed at one end of the outlet of the drain pipe (31).

9. The heat exchanger according to claim 6, characterized in that, A first temperature measuring element (38) is provided on the condensate inlet pipe (32), and a second temperature measuring element (39) is provided on the condensate outlet pipe (33).

10. The heat exchanger according to claim 9, characterized in that, The heat exchanger also includes a rotor (4), the shaft of which is rotatably connected to the housing (1). The outlet of the condensate inlet pipe (32) is connected to the inlet of the water inlet pipe (21) via a water delivery hose. The inlet of the condensate outlet pipe (33) is connected to the outlet of the water outlet pipe (23) via a water delivery hose.

11. The heat exchanger according to any one of claims 1-10, characterized in that, The heat exchanger also includes a filter screen (5), which is detachably installed on the housing (1) and is used to shield the air inlet (12).

12. The heat exchanger according to any one of claims 1-10, characterized in that, A through hole is provided on the side wall of the housing (1) corresponding to the air outlet (13), and a third temperature measuring element (6) is fixed at the through hole. The third temperature measuring element (6) can detect the temperature at the air outlet (13).

13. A thin plate wire drying machine, comprising a heat exchanger as described in any one of claims 1-12, characterized in that, The air inlet of the hot air heat exchanger of the thin plate wire drying machine is directly opposite the air outlet (13), and the inlet of the water inlet pipe (21) is connected to the condensate discharge outlet of the thin plate wire drying machine.

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