Hot air circulation system

Abstract

The invention discloses a hot air circulation system, comprising: a dryer, an air inlet channel and a shunt channel are arranged inside the dryer, the dryer is connected to a drying box, and the shunt channel is connected to the drying box; an exhaust gas recovery device, comprising a first casing, a first fan, a first heat exchanger, a second heat exchanger, an evaporator, a third heat exchanger, a first collector and a second collector are arranged inside the first casing, the first fan forms an airflow recovery direction that flows along the first heat exchanger, the second heat exchanger, the evaporator and the third heat exchanger in sequence in the first casing, the first heat exchanger has an air inlet side and an air outlet side, the shunt channel at the head end is connected to the air inlet side through a pipeline, and the air inlet channel at the head end is connected to the air outlet side through a pipeline. The invention can repeatedly recycle water and ethanol in the airflow after drying, and can form a relatively sealed system in the entire recycling process, which is more energy-saving and environmentally friendly.

Description

Technical Field

[0001] The invention relates to a gas supply device, in particular to a hot air circulation system. Background Art

[0002] When hot air is used for drying, the airflow is usually introduced into a heating mechanism, heated by the heating mechanism, and then introduced into a drying box to heat the items. For example, when it is necessary to dry items printed with water-based ink on flexible packaging, the dried gas will contain water and ethanol. The traditional treatment method only simply treats the dried gas and then discharges it into the air without recycling it, and also requires high energy consumption during gas treatment. Summary of the invention

[0003] The purpose of the present invention is to provide a hot air circulation system to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The solution of the present invention to solve its technical problem is:

[0005] A hot air circulation system comprises: a dryer, wherein an air inlet channel and a shunt channel are arranged in parallel with each other, the dryer is connected to a drying box, the shunt channel is connected to the drying box, the dryer is arranged in a plurality along a straight line, all of the air inlet channels are connected in sequence along a straight line, all of the shunt channels are connected in sequence along a straight line, and the air inlet channel at the end is connected to the shunt channel at the end; an exhaust gas recovery device comprises a first casing, wherein a first fan, a first heat exchanger, a second heat exchanger, an evaporator, a third heat exchanger, a first collector and a second collector are arranged in the first casing, the first fan forms an air flow recovery direction in the first casing that flows in sequence along the first heat exchanger, the second heat exchanger, the evaporator and the third heat exchanger, and the exhaust gas recovery device comprises a first casing, wherein a first fan, a first heat exchanger, a second heat exchanger, a third heat exchanger, a first collector and a second collector are arranged in the first casing, the first fan forms an air flow recovery direction in the first casing that flows in sequence along the first heat exchanger, the second heat exchanger, the evaporator and the third heat exchanger, and the exhaust gas recovery device comprises a first casing, wherein a first fan, a first heat exchanger, a second heat exchanger, the evaporator and the third heat exchanger are arranged in the first casing ... A heat exchanger has an air inlet side and an air outlet side, the diverter channel located at the head end is connected to the air inlet side through a pipeline, the airflow passes through the first heat exchanger from the air inlet side and flows along the airflow recovery direction, the airflow after passing through the third heat exchanger passes through the first heat exchanger and flows out from the air outlet side, the diverter channel and the air inlet channel located at the head end are connected to the air outlet side through a pipeline, a second fan is provided at the pipeline connection between the diverter channel and the air inlet side and / or at the pipeline connection between the air inlet channel and the air outlet side, the second heat exchanger and the third heat exchanger are interconnected by a pipeline to form a first refrigerant circulation loop, the evaporator is connected to a refrigeration component, the first collector is used to collect condensate precipitated from the second heat exchanger, and the second collector is used to collect condensate precipitated from the evaporator.

[0006] This technical solution has at least the following beneficial effects: under the action of the second fan, dry air is sent into the air inlet channel, and after passing through all the air inlet channels, the dry air returns from the air inlet channel at the end and enters the diversion channel, enters the drying box from a diversion channel for drying, and then returns to the diversion channel to continue to be transported to the next diversion channel, and so on until the exhaust gas is finally discharged from the diversion channel at the end. After entering the first heat exchanger from the air inlet side, under the action of the first fan, it flows through the second heat exchanger, evaporator and third heat exchanger in sequence along the air flow recovery direction, and then flows out from the air outlet side after passing through the first heat exchanger. The refrigeration component can cool the evaporator, and the airflow can bring the cold of the evaporator to the third heat exchanger. The third heat exchanger can transfer the cold to the second heat exchanger through the first refrigerant circulation loop formed with the second heat exchanger, and the third heat exchanger can transfer the cold to the second heat exchanger through the first refrigerant circulation loop formed with the second heat exchanger. The airflow after heat exchange in the heat exchanger passes through the first heat exchanger and then flows out from the air outlet side. In this way, the temperature of the first heat exchanger is higher than that of the second heat exchanger, so that the high-temperature exhaust gas that enters later is first cooled by the first heat exchanger, and then further cooled by the second heat exchanger. Condensed water can be precipitated in the second heat exchanger, and the water is recovered by the first collector. The airflow is further cooled by the evaporator, and the temperature is further reduced and ethanol is condensed in the evaporator. The ethanol is recovered by the second collector. The water content and ethanol content of the gas after the recovery treatment are relatively low, and can be repeatedly refluxed to the air inlet channel of the first dryer to form an air path cycle. In this way, the water and ethanol in the airflow after drying can be repeatedly recycled, thereby improving resource utilization, and a relatively sealed system can be formed in the entire recycling process, thereby reducing the impact of external interference, reducing energy consumption, and being more energy-saving and environmentally friendly.

[0007] As a further improvement of the above technical solution, a ventilation chamber and a storage chamber are sequentially arranged in the dryer from top to bottom, the air inlet channel and the diversion channel are arranged in the ventilation chamber, a heating mechanism is arranged in the storage chamber, an air inlet is arranged at the top side of the storage chamber opposite to the diversion channel, a first switch valve is arranged in the air inlet, and the first switch valve can open or close the air inlet, an air outlet is arranged on the side wall of the storage chamber, the heating mechanism is respectively connected to the air inlet and the air outlet through pipelines, a return air outlet is arranged in the storage chamber opposite to the diversion channel, a second switch valve is arranged in the return air outlet, and the second switch valve can open or close the return air outlet, and the air outlet and the return air outlet are respectively connected to the drying box through pipelines. When multiple shells are arranged and spliced ​​for use, the first shells can be directly connected to each other, the air inlet channels of each shell are interconnected, and the diversion channels of each first shell are interconnected, so that the airflow is introduced into the first air inlet channel arranged, and after the airflow flows through all the air inlet channels, it returns from the air inlet channel at the end to the diversion channel at the end. Every time the airflow passes through an air inlet, if the first switch valve in the air inlet is opened, the airflow can flow into the heating mechanism for heating, and be discharged from the air outlet for use, and finally flow back from the drying box to the diversion channel for continued transportation. When the second switch valve in the air inlet is closed, the return air port is also closed, and the airflow does not flow into the heating mechanism. In this way, the structure of the shell itself is used to form an airflow channel, and it can be designed into a single or multiple combinations for use according to the needs of use. It is flexible to use and has strong versatility.

[0008] As a further improvement of the above technical solution, the first switch valve includes a first telescopic cylinder connected to the top side of the ventilation chamber, a first sealing plate connected to the first telescopic cylinder, the first sealing plate is located in the diversion channel, a first sealing gasket is provided on the top side of the air inlet, and the first telescopic cylinder can drive the first sealing plate to approach or move away from the air inlet and open or close the air inlet. The first telescopic cylinder drives the first sealing plate to move downward and cover the air inlet, which can tighten the fit to the air inlet, reduce the airflow entering from all sides of the air inlet, and improve the air tightness. When the first sealing plate covers the air inlet, it is offset against the first sealing gasket, and the deformation of the first sealing gasket can be used to further fill the gap between the first sealing plate and the air inlet, further improving the air tightness.

[0009] As a further improvement of the above technical solution, the top side of the storage chamber protrudes upward to form a connecting platform, the return air outlet is located on the top side of the connecting platform, the side wall of the connecting platform is connected to the drying box through a pipeline, the second switch valve includes a second telescopic cylinder connected to the top side of the ventilation chamber, and a second sealing plate connected to the second telescopic cylinder, the second sealing plate is located in the diversion channel, and a second sealing gasket is provided on the top side of the return air outlet, and the second telescopic cylinder can drive the second sealing plate to approach or move away from the return air outlet and make the return air outlet open or closed. The gas reflowing in the drying box is sent to the connecting platform through the pipeline, and can flow back into the diversion channel from the return air port, and the second sealing plate can open or close the return air port. Specifically, the second sealing plate is driven downward by the second telescopic cylinder to cover the return air port, which can tighten the fit to the return air port, reduce airflow entering from all around the return air port, and improve air tightness. When the first sealing plate covers the return air port, it is offset against the second sealing gasket. The deformation of the second sealing gasket can be used to further fill the gap between the second sealing plate and the return air port, thereby further improving air tightness.

[0010] As a further improvement of the above technical solution, a partition plate is provided in the ventilation chamber, and the partition plate divides the inner part of the ventilation chamber into an air inlet channel and a diversion channel, wherein: in the dryer located at the end, a ventilation gap is provided between the partition plate and the side wall of the ventilation chamber located at the end, and the air inlet channel is interconnected with the diversion channel through the ventilation gap; in the dryer located at the head end, a main air inlet is provided on the side wall of the head side of the ventilation chamber facing the air inlet channel, and a main air outlet is provided on the side wall of the head side of the ventilation chamber facing the diversion channel, the main air outlet is connected to the air inlet side through a pipeline, and the main air inlet is connected to the air outlet side through a pipeline. A partition plate is used in the ventilation chamber to separate its own space into an air inlet channel and a diversion channel. The side wall of the ventilation chamber located in the end direction is used to block the airflow in the dryer at the end to realize airflow deflection. The airflow can flow into the diversion channel from the ventilation gap. When multiple dryers are spliced ​​with each other, a main air inlet is opened on the side wall of the ventilation chamber located in the head direction in the dryer at the head end to introduce gas into the air inlet channel, and a main air outlet is opened on the side wall of the ventilation chamber located in the head direction to discharge gas from the diversion channel.

[0011] As a further improvement of the above technical solution, a windshield is provided on the side wall of the diversion channel, and the windshield is located between the air inlet and the return air outlet. The airflow in the diversion channel passes through the air inlet and the return air outlet in sequence, and the addition of the windshield can reduce the airflow from passing through the air inlet and directly entering the return air outlet.

[0012] As a further improvement of the above technical solution, the evaporator includes a fixed frame, a second refrigerant tube and a first refrigerant tube sequentially arranged in the fixed frame along the airflow recovery direction, the second collector is located between the first refrigerant tube and the second refrigerant tube, one end of the first refrigerant tube is the first input end, the other end of the first refrigerant tube is the first output end, one end of the second refrigerant tube is the second input end, the other end of the second refrigerant tube is the second output end, the first output end is connected to the second input end, the first input end and the second output end are respectively connected to the refrigeration assembly through pipelines, and the temperature of the first refrigerant tube is lower than the temperature of the second refrigerant tube. The refrigerant first flows into the first refrigerant tube from the first input end, then flows into the second refrigerant tube, and finally flows back to the refrigeration assembly from the second output end. The airflow first passes through the heat exchange of the second refrigerant tube to achieve preliminary cooling, and then further cools down the first refrigerant tube to achieve condensation of ethanol, and the second collector is used to recover ethanol. In this way, the airflow is cooled in sections, which can improve the cooling effect of the airflow, thereby increasing the recovery amount of ethanol.

[0013] As a further improvement of the above technical solution, the bottom of the casing forms a collecting trough with an opening upward, the collecting trough is the first collector, the condensate precipitated from the second refrigerant tube drips into the collecting trough, the collecting trough is connected to a spray device, the spray device has a spray port, and the spray port is directly opposite to the second refrigerant tube. The first collector is mainly formed by a trough structure formed at the bottom of the casing to form a collecting trough, the condensate precipitated from the second heat exchanger directly drips into the collecting trough, and the condensate is collected by the collecting trough, the condensate precipitated from the second refrigerant tube contains water and ethanol, and also drips into the collecting trough after precipitation, and is collected by the collecting trough, and then the spray device sprays the mixed liquid of water and ethanol from the spray port onto the second refrigerant tube for evaporation, enters the first refrigerant tube with the airflow, and then uses the second collector to collect ethanol, thereby increasing the recovery of ethanol.

[0014] As a further improvement of the above technical solution, the refrigeration component includes a compressor and a condenser. The compressor, the condenser, the first refrigerant pipe and the second refrigerant pipe are interconnected to form a second refrigerant circulation loop. A fourth heat exchanger is connected between the compressor and the condenser, and the fourth heat exchanger is located on the air outlet side. The refrigerant is compressed by the compressor, flows to the condenser to release heat, flows to the first refrigerant pipe and the second refrigerant pipe to absorb heat, and then flows back to the compressor for circulation. The fourth heat exchanger can release heat, thereby reducing the burden on the condenser. The fourth heat exchanger can be used to heat the gas that has been recycled and processed after passing through the first heat exchanger, thereby improving the heat utilization rate in the refrigeration component.

[0015] As a further improvement of the above technical solution, the second collector includes a liquid collecting frame and a liquid collecting plate, the liquid collecting frame has a ventilation hole running through it in the up-down direction, the liquid collecting frame is provided with a liquid collecting tank, the liquid collecting plate is connected to the ventilation hole, one end of the liquid collecting plate extends downwardly in a direction close to the liquid collecting tank, one end of the liquid collecting plate is inserted into the liquid collecting tank, and there are multiple liquid collecting plates arranged along the length extension direction of the liquid collecting tank, and the liquid collecting plate is a V-shaped structure with the opening upward. The airflow blows through the liquid collecting plate from bottom to top, and the V-shaped liquid collecting plate can guide the airflow. After bypassing the liquid collecting plate, the airflow blows into the first refrigerant pipe, and the ethanol condensed on the first refrigerant pipe drips onto the liquid collecting plate, and flows obliquely into the liquid collecting tank in the V-shaped groove formed by the liquid collecting plate for unified recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0017] Figure 1 It is the overall principle diagram of the present invention;

[0018] Figure 2 is a first stereoscopic view of the dryer of the present invention after the side panels are hidden;

[0019] Figure 3 is a second stereoscopic view of the dryer of the present invention;

[0020] Figure 4 It is the principle diagram of the waste gas recovery device of the present invention;

[0021] Figure 5 is a front view of the evaporator of the present invention;

[0022] Figure 6 is a side view of the evaporator of the present invention;

[0023] Figure 7 It is a stereoscopic view of a second collector of the present invention.

[0024] In the attached drawings: 100-dryer, 111-air inlet channel, 112-dividing channel, 120-storage chamber, 130-partition plate, 140-main air inlet, 150-main air outlet, 160-drying box, 170-second fan, 200-heating mechanism, 300-air inlet, 310-first switch valve, 400-air outlet, 500-second switch valve, 510-connection platform, 610-first housing , 620-first fan, 630-first heat exchanger, 640-second heat exchanger, 650-evaporator, 651-fixed frame, 652-second refrigerant pipe, 653-first refrigerant pipe, 654-capillary tube, 661-compressor, 662-condenser, 663-fourth heat exchanger, 670-third heat exchanger, 680-second collector, 681-liquid collecting frame, 682-liquid collecting plate, 683-liquid collecting tank. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connecting accessories according to the specific implementation situation. The various technical features in the invention can be combined interchangeably without conflicting with each other.

[0026] Reference Figure 1 and Figure 4A hot air recycling system comprises: a dryer 100, wherein an air inlet channel 111 and a diversion channel 112 are arranged in parallel with each other, the dryer 100 is connected to a drying box 160, the diversion channel 112 is connected to the drying box 160, the dryer 100 has a plurality of air inlet channels 111 arranged in a straight line, all of the air inlet channels 111 are connected in sequence in the straight line direction, all of the diversion channels 112 are connected in sequence in the straight line direction, and the air inlet channels 111 at the end are connected to The exhaust gas recovery device includes a first housing 610, wherein a first fan 620, a first heat exchanger 630, a second heat exchanger 640, an evaporator 650, a third heat exchanger 670, a first collector and a second collector 680 are arranged in the first housing 610, and the first fan 620 forms a heat exchanger along the first heat exchanger 630, the second heat exchanger 640, the evaporator 650 and the third heat exchanger 670 in the first housing 610. 0 in sequence, the first heat exchanger 630 has an air inlet side and an air outlet side, the diverter channel 112 at the head end is connected to the air inlet side through a pipeline, the airflow passes through the first heat exchanger 630 from the air inlet side and flows along the airflow recovery direction, the airflow after passing through the third heat exchanger 670 passes through the first heat exchanger 630 and flows out from the air outlet side, the diverter channel 112 and the air inlet channel 111 at the head end are connected to the air outlet through a pipeline On the side, a second fan 170 is provided at the pipe connection between the diversion channel 112 and the air inlet side and / or at the pipe connection between the air inlet channel 111 and the air outlet side, the second heat exchanger 640 and the third heat exchanger 670 are interconnected by a pipe to form a first refrigerant circulation loop, the evaporator 650 is connected to a refrigeration component, the first collector is used to collect the condensate precipitated from the second heat exchanger 640, and the second collector 680 is used to collect the condensate precipitated from the evaporator 650.

[0027] As can be seen from the above, under the action of the second fan 170, the dry airflow is sent into the air inlet channel 111. After passing through all the air inlet channels 111, the dry airflow returns from the air inlet channel 111 at the end and enters the branch channel 112, enters the drying box 160 from a branch channel 112 for drying, and then flows back to the branch channel 112 to continue to be transported to the next branch channel 112, and finally exhausts the exhaust gas from the branch channel 112 at the end and enters the second branch channel 112 from the air inlet side. After the first heat exchanger 630, under the action of the first fan 620, the air flows in the airflow recovery direction, sequentially through the second heat exchanger 640, the evaporator 650 and the third heat exchanger 670, and then flows out from the air outlet side after passing through the first heat exchanger 630. The refrigeration component can cool the evaporator 650, and the airflow can bring the coldness of the evaporator 650 to the third heat exchanger 670. The third heat exchanger 670 can transfer the coldness to the second heat exchanger through the first refrigerant circulation loop formed with the second heat exchanger 640. The airflow after heat exchange with the third heat exchanger 670 passes through the first heat exchanger 630 and then flows out from the air outlet side. In this way, the temperature of the first heat exchanger 630 is higher than that of the second heat exchanger 640, so that the high-temperature exhaust gas that enters later is first cooled by the first heat exchanger 630, and then further cooled by the second heat exchanger 640. Condensed water can be precipitated in the second heat exchanger 640, and the water is recovered by the first collector. The airflow is further cooled by the evaporator 650, and the temperature is further reduced and ethanol is condensed in the evaporator 650. The ethanol is recovered by the second collector 680. The water content and ethanol content of the gas after the recovery treatment are relatively low, and can be repeatedly refluxed to the air inlet channel 111 of the first dryer 100 to form an air path cycle. In this way, the water and ethanol in the airflow after drying can be repeatedly recycled, thereby improving resource utilization, and a relatively sealed system can be formed in the entire recycling process, thereby reducing the impact of external interference, reducing energy consumption, and being more energy-saving and environmentally friendly.

[0028] In practical applications, the airflow recovery direction is formed in the first housing 610 by the first fan 620, which can be realized by installing a partition plate 130 in the first housing 610. Multiple partition plates 130 can directly enclose a channel for guiding the airflow in the first housing 610, thereby forming the above-mentioned airflow recovery direction, and then the first heat exchanger 630, the second heat exchanger 640, the evaporator 650 and the third heat exchanger 670 can be arranged in the channel. In order to enhance the flow in the airflow recovery direction, multiple fans can be arranged in the first housing 610, and the second fan 170 can be arranged at the connection between the shunt channel 112 and the pipeline on the air inlet side, and the airflow enters the air inlet channel 111 and then flows into the shunt channel 112 through the second fan 170.

[0029] like Figure 2 and Figure 3As shown in the figure, as a further structural embodiment of the dryer 100, the dryer 100 is provided with a ventilation chamber and a storage chamber 120 from top to bottom, the ventilation chamber is provided with the air inlet channel 111 and the diversion channel 112, the storage chamber 120 is provided with a heating mechanism 200, the storage chamber 120 is provided with an air inlet 300 on the top side of the diversion channel 112, the air inlet 300 is provided with a first switch valve 310, and the first switch valve 310 can make the The air inlet 300 is opened or closed, and an air outlet 400 is provided on the side wall of the storage chamber 120. The heating mechanism 200 is respectively connected to the air inlet 300 and the air outlet 400 through pipelines. The storage chamber 120 is provided with a return air port at a position opposite to the diversion channel 112. A second switch valve 500 is provided in the return air port, and the second switch valve 500 can open or close the return air port. The air outlet 400 and the return air port are respectively connected to the drying box 160 through pipelines. When multiple shells are arranged and spliced ​​for use, the first shells 610 can be directly connected to each other, the air inlet channels 111 of each shell are interconnected, and the bypass channels 112 of each first shell 610 are interconnected, so that the airflow is introduced into the first air inlet channel 111. After the airflow flows through all the air inlet channels 111, it returns from the air inlet channel 111 at the end to the bypass channel 112 at the end. Every time the airflow passes through an air inlet 300, if the first switch valve 310 in the air inlet 300 is opened, the airflow can flow into the heating mechanism 200 for heating, and be discharged from the air outlet 400 for use, and finally flow back from the drying box 160 to the bypass channel 112 for continued transportation. When the second switch valve 500 in the air inlet 300 is closed, the return air port is also closed, and the airflow does not flow into the heating mechanism 200. In this way, the airflow channel is formed by utilizing the structure of the shell itself, and can be designed to be used in single or multiple combinations according to the needs of use. It is flexible to use and has strong versatility.

[0030] The first switch valve 310 is mainly used to open or close the air inlet 300. In this embodiment, the first switch valve 310 includes a first telescopic cylinder connected to the top side of the ventilation chamber, and a first sealing plate connected to the first telescopic cylinder. The first sealing plate is located in the diversion channel 112. A first sealing gasket is provided on the top side of the air inlet 300. The first telescopic cylinder can drive the first sealing plate to move closer to or away from the air inlet 300 and open or close the air inlet 300. The first telescopic cylinder drives the first sealing plate to move downward and cover the air inlet 300, which can tighten the fit of the air inlet 300, reduce the airflow entering from all sides of the air inlet 300, and improve the air tightness. When the first sealing plate covers the air inlet 300, it is offset against the first sealing gasket. The deformation of the first sealing gasket can further fill the gap between the first sealing plate and the air inlet 300, further improving the air tightness.

[0031] The return air vent is mainly used to reintroduce the airflow after use into the diversion channel 112. In the present embodiment, the top side of the storage chamber 120 protrudes upward to form a connecting platform 510, and the return air vent is located on the top side of the connecting platform 510. The side wall of the connecting platform 510 is connected to the drying box 160 through a pipeline. The second switch valve 500 includes a second telescopic cylinder connected to the top side of the ventilation chamber and a second sealing plate connected to the second telescopic cylinder. The second sealing plate is located in the diversion channel 112. A second sealing gasket is provided on the top side of the return air vent. The second telescopic cylinder can drive the second sealing plate to approach or move away from the return air vent and open or close the return air vent. The gas reflowing in the drying box 160 is sent to the connecting platform 510 through the pipeline, and can flow back to the diversion channel 112 from the return air port, and the second sealing plate can open or close the return air port. Specifically, the second sealing plate is driven by the second telescopic cylinder to move downward and cover the return air port, which can tighten the fit to the return air port, reduce airflow entering from all around the return air port, and improve air tightness. When the first sealing plate covers the return air port, it is offset against the second sealing gasket. The deformation of the second sealing gasket can be used to further fill the gap between the second sealing plate and the return air port, thereby further improving air tightness.

[0032] When multiple dryers 100 are connected to each other, in the dryer 100 located in the middle, the air inlet channel 111 and the diversion channel 112 can directly penetrate the ventilation chamber, while the structure of the dryers 100 located at the head end and the end has adaptive adjustment. In this embodiment, a partition plate 130 is arranged in the ventilation chamber, and the partition plate 130 divides the interior of the ventilation chamber into the air inlet channel 111 and the diversion channel 112, wherein: in the dryer 100 located at the end, the partition plate 130 and the ventilation chamber are located at the end. There is a ventilation gap between the side walls, and the air inlet channel 111 is connected with the diversion channel 112 through the ventilation gap; in the dryer 100 located at the head end, a main air inlet 140 is provided on the side wall of the head side of the ventilation chamber opposite to the air inlet channel 111, and a main air outlet 150 is provided on the side wall of the head side of the ventilation chamber opposite to the diversion channel 112, the main air outlet 150 is connected to the air inlet side through a pipeline, and the main air inlet 140 is connected to the air outlet side through a pipeline. A partition plate 130 is used in the ventilation chamber to separate its own space into an air inlet channel 111 and a diversion channel 112. The side wall of the ventilation chamber in the terminal direction is used to block the airflow in the dryer 100 at the end to realize airflow deflection. The airflow can flow into the diversion channel 112 from the ventilation gap. When multiple dryers 100 are spliced ​​with each other, a main air inlet 140 is opened on the side wall of the ventilation chamber in the forward direction in the dryer 100 at the head end for introducing gas into the air inlet channel 111, and a main air outlet 150 is opened on the side wall of the ventilation chamber in the forward direction for outlet gas from the diversion channel 112.

[0033] In this embodiment, a windshield is provided on the side wall of the diverter channel 112, and the windshield is located between the air inlet 300 and the return air outlet. The airflow in the diverter channel 112 passes through the air inlet 300 and the return air outlet in sequence, and the addition of the windshield can reduce the airflow from passing through the air inlet 300 and entering directly from the return air outlet.

[0034] As a further structural embodiment of the heating mechanism 200, the heating mechanism 200 includes a heating box, a first fan 620 and a heating source, the heating box is located in the storage chamber 120, the top side of the heating box is connected to the air inlet 300 through a pipeline, the heating source is located in the heating box, and the first fan 620 has an air inlet end and an air outlet end, the air inlet end is connected to one side of the heating box, and the air outlet end is connected to the air outlet 400. The first fan 620 can strengthen the airflow power, so that the airflow enters the heating box from the air inlet 300 through the pipeline, and the airflow is heated by the heating source and then discharged from the air outlet end to the air outlet 400.

[0035] like Figure 5 and Figure 6As shown, in order to improve the cooling effect on the airflow, in this embodiment, the evaporator 650 includes a fixed frame 651, a second refrigerant tube 652 and a first refrigerant tube 653 which are sequentially arranged in the fixed frame 651 along the airflow recovery direction, and the second collector 680 is located between the first refrigerant tube 653 and the second refrigerant tube 652, one end of the first refrigerant tube 653 is a first input end, and the other end of the first refrigerant tube 653 is a first output end, one end of the second refrigerant tube 652 is a second input end, and the other end of the second refrigerant tube 652 is a second output end, the first output end is connected to the second input end, and the first input end and the second output end are respectively connected to the refrigeration component through pipelines, and the temperature of the first refrigerant tube 653 is lower than the temperature of the second refrigerant tube 652. The refrigerant first flows into the first refrigerant tube 653 from the first input end, then flows into the second refrigerant tube 652, and finally flows back to the refrigeration component from the second output end. The airflow first passes through the heat exchange of the second refrigerant tube 652 to achieve initial cooling, and then passes through the first refrigerant tube 653 for further cooling to condense ethanol. The ethanol is recovered by the second collector 680. The airflow is cooled in sections, which can improve the cooling effect of the airflow, thereby increasing the amount of ethanol recovered.

[0036] As a further structural embodiment of the arrangement of the first refrigerant tube 653 and the second refrigerant tube 652, there are multiple first refrigerant tubes 653 and the second refrigerant tube 652 arranged in the horizontal direction, all the first refrigerant tubes 653 are connected to all the second refrigerant tubes 652 one by one, and all the first input ends and the refrigeration components are connected with capillary tubes 654. Multiple refrigerant tubes are arranged in the fixed frame 651 to increase the cooling cross-sectional area of ​​the airflow, and the refrigerant with cold output from the refrigeration component is distributed to multiple first refrigerant tubes 653 through multiple capillary tubes 654, so that the temperature distribution is more uniform.

[0037] In order to further improve the recovery of ethanol, in this embodiment, the bottom of the housing forms a collection tank with an opening upward, and the collection tank is the first collector. The condensate precipitated from the second refrigerant tube 652 drips into the collection tank. The collection tank is connected to a spray device, and the spray device has a spray port, and the spray port is directly opposite to the second refrigerant tube 652. The first collector is mainly formed by a groove structure formed at the bottom of the housing to form a collection tank. The condensate precipitated from the second heat exchanger 640 directly drips into the collection tank, and the condensate is collected by the collection tank. The condensate precipitated from the second refrigerant tube 652 contains water and ethanol, and also drips into the collection tank after precipitation, and is collected by the collection tank. Then, the spray device sprays the mixed liquid of water and ethanol from the spray port to the second refrigerant tube 652 for evaporation, and enters the first refrigerant tube 653 with the air flow, and then the second collector 680 is used to collect ethanol, thereby improving the recovery of ethanol. In actual application, the spray device includes a spray pipe, a spray head and a delivery pump. One end of the spray pipe is connected to the collecting tank, the other end of the spray head is connected to the other end of the spray pipe, the spray port is arranged on the spray head, and the delivery pump delivers the liquid in the collecting tank to the spray head through the spray pipe.

[0038] The refrigeration component is mainly used to cool the evaporator 650. In this embodiment, the refrigeration component includes a compressor 661 and a condenser 662. The compressor 661, the condenser 662, the first refrigerant pipe 653 and the second refrigerant pipe 652 are interconnected to form a second refrigerant circulation loop. A fourth heat exchanger 663 is connected between the compressor 661 and the condenser 662, and the fourth heat exchanger 663 is located on the air outlet side. Through the compression of the refrigerant by the compressor 661, the refrigerant flows to the condenser 662 to release heat, flows to the first refrigerant pipe 653 and the second refrigerant pipe 652 to absorb heat, and then flows back to the compressor 661 for circulation. The fourth heat exchanger 663 can release heat, thereby reducing the burden on the condenser 662. The fourth heat exchanger 663 can heat the gas that has been recycled and processed after passing through the first heat exchanger 630, thereby improving the heat utilization rate in the refrigeration component.

[0039] As a further structural embodiment of the first collector, the first collector is a liquid collecting pan, the liquid collecting pan has a liquid collecting tank 683 opening upward, the liquid collecting pan is connected to a drain pipe, and the drain pipe is interconnected with the liquid collecting tank 683. The condensed water precipitated from the second heat exchanger 640 can directly drip onto the liquid collecting pan, be collected and recovered in the liquid collecting tank 683, and be discharged through the drain pipe.

[0040] like Figure 7As shown, as a further structural embodiment of the second collector 680, the second collector 680 includes a liquid collecting frame 681 and a liquid collecting plate 682, the liquid collecting frame 681 has a ventilation hole passing through in the up and down directions, the liquid collecting frame 681 is provided with a liquid collecting tank 683, the liquid collecting plate 682 is connected to the ventilation hole, one end of the liquid collecting plate 682 extends obliquely downward in a direction close to the liquid collecting tank 683, one end of the liquid collecting plate 682 is inserted into the liquid collecting tank 683, a plurality of the liquid collecting plates 682 are arranged along the length extension direction of the liquid collecting tank 683, and the liquid collecting plate 682 is a V-shaped structure with an opening upward. The airflow blows through the liquid collecting plate 682 from bottom to top. The V-shaped liquid collecting plate 682 can guide the airflow. The airflow bypasses the liquid collecting plate 682 and blows into the first refrigerant tube 653. The ethanol condensed on the first refrigerant tube 653 drops onto the liquid collecting plate 682, and flows obliquely into the liquid collecting groove 683 in the V-shaped groove formed by the liquid collecting plate 682 for unified recovery.

[0041] As a further structural embodiment of the arrangement of the liquid collecting plates 682, all the liquid collecting plates 682 arranged on the same horizontal plane are a liquid collecting unit, and a plurality of the liquid collecting units are arranged in the vertical direction. In any two adjacent liquid collecting units, all the liquid collecting plates 682 located on the upper side are staggered with all the liquid collecting plates 682 located on the lower side. The plurality of liquid collecting plates 682 staggered in the vertical direction can improve the recovery efficiency of the condensed ethanol and reduce the phenomenon that the ethanol directly drips and cannot be recovered.

[0042] In some embodiments, the first heat exchanger 630 is a plate heat exchanger, which has a good heat exchange effect and improves the heat exchange efficiency between the recovered gas and the gas before treatment. The second heat exchanger 640 is a tube-fin heat exchanger, which is not easy to clog, reducing the occurrence of condensed water scaling blocking the airflow channel.

[0043] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A hot air circulation system, characterized in that: include: A dryer (100), wherein an air inlet channel (111) and a flow diversion channel (112) are arranged in parallel with each other, the dryer (100) is connected to a drying box (160), the flow diversion channel (112) is connected to the drying box (160), a plurality of the dryers (100) are arranged in a straight line direction, all the air inlet channels (111) are connected in sequence in the straight line direction, all the flow diversion channels (112) are connected in sequence in the straight line direction, and the air inlet channel (111) at the end is connected to the flow diversion channel (112) at the end; An exhaust gas recovery device comprises a first housing (610), wherein a first fan (620), a first heat exchanger (630), a second heat exchanger (640), an evaporator (650), a third heat exchanger (670), a first collector and a second collector (680) are arranged in the first housing (610), wherein the first fan (620) forms an airflow recovery direction in the first housing (610) that flows in sequence along the first heat exchanger (630), the second heat exchanger (640), the evaporator (650) and the third heat exchanger (670), wherein the first heat exchanger (630) has an air inlet side and an air outlet side, wherein the diversion channel (112) located at the head end is connected to the air inlet side through a pipeline, and the airflow flows from the first housing (610) to the second housing (610). The air inlet side passes through the first heat exchanger (630) and flows along the air flow recovery direction. The air flow after passing through the third heat exchanger (670) passes through the first heat exchanger (630) and flows out from the air outlet side. The diverter channel (112) and the air inlet channel (111) located at the head end are connected to the air outlet side through a pipeline. A second fan (170) is provided at the pipeline connection between the diverter channel (112) and the air inlet side and / or the pipeline connection between the air inlet channel (111) and the air outlet side. The second heat exchanger (640) and the third heat exchanger (670) are interconnected by a pipeline to form a first refrigerant circulation loop. The evaporator (650) is connected to a refrigeration component. The first collector is used to collect The second heat exchanger (640) precipitates condensate, and the second collector (680) is used to collect the condensate precipitated by the evaporator (650). The evaporator (650) includes a fixed frame (651), a second refrigerant tube (652) and a first refrigerant tube (653) which are sequentially arranged in the fixed frame (651) along the airflow recovery direction. The second collector (680) is located between the first refrigerant tube (653) and the second refrigerant tube (652). One end of the first refrigerant tube (653) is a first input end, and the other end of the first refrigerant tube (653) is a first output end. One end of the second refrigerant tube (652) is a second input end, and the other end of the second refrigerant tube (652) is a second output end. end, the first output end is connected to the second input end, the first input end and the second output end are respectively connected to the refrigeration component through pipelines, the temperature of the first refrigerant tube (653) is lower than the temperature of the second refrigerant tube (652), the second collector (680) includes a liquid collecting frame (681) and a liquid collecting plate (682), the liquid collecting frame (681) has a ventilation hole passing through in the up and down directions, the liquid collecting frame (681) is provided with a liquid collecting tank (683), the liquid collecting plate (682) is connected to the ventilation hole, one end of the liquid collecting plate (682) extends downwardly in a direction close to the liquid collecting tank (683), and one end of the liquid collecting plate (682) is inserted into the liquid collecting tank (683),A plurality of the liquid collecting plates (682) are arranged along the length extension direction of the liquid collecting tank (683), and the liquid collecting plates (682) are V-shaped structures with an opening facing upward.

2. A hot air circulation system according to claim 1, characterized in that: The dryer (100) is provided with a ventilation chamber and a storage chamber (120) from top to bottom, the ventilation chamber is provided with the air inlet channel (111) and the diversion channel (112), the storage chamber (120) is provided with a heating mechanism (200), the storage chamber (120) is provided with an air inlet (300) on the top side of the diversion channel (112), the air inlet (300) is provided with a first switch valve (310), and the first switch valve (310) can open the air inlet (300). or closed, an air outlet (400) is provided on the side wall of the storage chamber (120), the heating mechanism (200) is respectively connected to the air inlet (300) and the air outlet (400) through pipelines, a return air port is provided at a position of the storage chamber (120) directly opposite to the diversion channel (112), a second switch valve (500) is provided in the return air port, and the second switch valve (500) can open or close the return air port, and the air outlet (400) and the return air port are respectively connected to the drying box (160) through pipelines.

3. A hot air circulation system according to claim 2, characterized in that: The first switch valve (310) comprises a first telescopic cylinder connected to the top side of the ventilation chamber and a first sealing plate connected to the first telescopic cylinder, the first sealing plate being located in the diversion channel (112), and a first sealing gasket being provided on the top side of the air inlet (300), the first telescopic cylinder being able to drive the first sealing plate to approach or move away from the air inlet (300) and to open or close the air inlet (300).

4. A hot air circulation system according to claim 2, characterized in that: The top side of the storage chamber (120) protrudes upward to form a connecting platform (510), the return air outlet is located on the top side of the connecting platform (510), and the side wall of the connecting platform (510) is connected to the drying box (160) through a pipeline. The second switch valve (500) includes a second telescopic cylinder connected to the top side of the ventilation chamber and a second sealing plate connected to the second telescopic cylinder, the second sealing plate is located in the diversion channel (112), and a second sealing gasket is arranged on the top side of the return air outlet. The second telescopic cylinder can drive the second sealing plate to approach or move away from the return air outlet and open or close the return air outlet.

5. A hot air circulation system according to claim 2, characterized in that: A partition plate (130) is provided in the ventilation chamber, and the partition plate (130) divides the interior of the ventilation chamber into an air inlet channel (111) and a flow diversion channel (112), wherein: In the dryer (100) located at the end, a ventilation gap is provided between the partition plate (130) and the side wall of the ventilation chamber located at the end, and the air inlet channel (111) is connected to the diversion channel (112) through the ventilation gap; In the dryer (100) located at the head end, a main air inlet (140) is provided at a position of the side wall of the head side of the ventilation chamber facing the air inlet channel (111), and a main air outlet (150) is provided at a position of the side wall of the head side of the ventilation chamber facing the diversion channel (112), the main air outlet (150) is connected to the air inlet side through a pipeline, and the main air inlet (140) is connected to the air outlet side through a pipeline.

6. A hot air circulation system according to claim 2, characterized in that: A wind shield is provided on the side wall of the diversion channel (112), and the wind shield is located between the air inlet (300) and the air return outlet.

7. A hot air circulation system according to claim 1, characterized in that: A collecting tank opening upward is formed at the bottom of the casing, and the collecting tank is the first collector. Condensate precipitated from the second refrigerant tube (652) drips into the collecting tank. The collecting tank is connected to a spray device, and the spray device has a spray port, and the spray port is directly opposite to the second refrigerant tube (652).

8. A hot air circulation system according to claim 1, characterized in that: The refrigeration component includes a compressor (661) and a condenser (662). The compressor (661), the condenser (662), the first refrigerant pipe (653) and the second refrigerant pipe (652) are interconnected to form a second refrigerant circulation loop. A fourth heat exchanger (663) is connected between the compressor (661) and the condenser (662). The fourth heat exchanger (663) is located on the air outlet side.

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