A plate heat exchange assembly and an automatic drying device for starch product production

Abstract

The application belongs to the technical field of plate heat exchange, and particularly relates to a plate heat exchange assembly and an automatic drying device for starch product production, which comprises a frame body, a heat exchange core body is installed in the frame body, the heat exchange core body comprises a plate heat exchange structure at the upper part and a condensation recovery structure at the lower side, the plate heat exchange structure is formed with a moisture channel and an air channel which are arranged at intervals, the moisture channel is a U-shaped rotary air duct which is open at the upper part, when the temperature of the condensate in the condensation coil is greater than the temperature of the air in the air pipe, the air can enter the next air pipe, the condensate can enter the next condensation coil, so that the heat exchange action can be continuously carried out, when the temperature of the condensate in the condensation coil is less than or equal to the temperature of the air in the air pipe, the air in the air pipe is sent into the straight air duct of the plate heat exchange assembly to continue the heat exchange and is then sent into the heat preservation board house, and the condensate is directly discharged through the lower condensation joint at the lower part, so that the waste heat of the condensate can be fully utilized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plate heat exchanger, and particularly relates to a plate heat exchanger assembly and an automatic drying device for starch product production. BACKGROUND

[0002] In the prior art, although the starch product drying equipment is provided with a condensate water collecting structure, generally no condensate water waste heat recovery structure is provided. For example, CN202211342072.5 discloses a heat exchange plate module and a gas-gas plate heat exchanger adapted thereto. When the cold and hot exchange of gas is carried out, the liquid moving forward is attached to the surface of the vertical or horizontal inclined strip, and is collected downward together due to the action of gravity, so as to avoid the water moving with the gas to the next equipment, improve the service life of the equipment, and ensure the normal operation of the equipment. When the liquid in the liquid collecting pipe reaches a certain weight, the sealing gasket moves downward, so that the water in the liquid collecting pipe is discharged through the gap between the fixed pipe and the sealing gasket, avoiding the phenomenon of air leakage in the drainage operation, and ensuring the heat exchange performance.

[0003] Although some condensate water waste heat recovery structures are installed, the generation of condensate water is related to the humidity of the starch product and the drying degree of the starch product during the drying process of the starch product. Therefore, the generation of condensate water is not quantitative when the starch product is dried. Only when the humidity of the starch product is large and the amount of condensate water collected is large, the condensate water has heat exchange value. When the amount of condensate water is small, the heat is quickly lost and cannot be exchanged from the condensate water. SUMMARY

[0004] The present application provides a plate heat exchanger assembly and an automatic drying device for starch product production, which solves the technical problem that the waste heat of condensate water during the drying process of the starch product cannot be effectively utilized in the prior art.

[0005] The present application provides the following technical solutions: The application discloses a plate heat exchange assembly, which comprises a frame body, a heat exchange core body is arranged in the frame body, the heat exchange core body comprises a plate heat exchange structure at the upper portion and a condensate recovery structure at the lower portion; the plate heat exchange structure is formed with spaced wet gas channels and air channels, wherein the wet gas channels are U-shaped rotary air ducts with openings at the upper portion, and the air channels are straight channels; the condensate recovery structure comprises a liquid collecting pipe arranged at the opening of the rotary air duct at the bottom portion, the liquid collecting pipe is connected with an automatic opening and closing box, the plate heat exchange structure is provided with condenser coils and air pipes at the lower portion, the first ends of the condenser coils penetrate into the automatic opening and closing box, the first ends of the air pipes are communicated with air outlet ports, the automatic opening and closing box is provided with liquid float switches for opening and closing the first ends of the condenser coils and the air pipes, a plurality of automatic distribution devices are connected to the condenser coils and the air pipes, the automatic distribution devices are provided with temperature sensing components and air flow channels, condensate flow channels and switching components which are not interfered with each other, the air flow channels are provided with front air joints, upper air joints and rear air joints, the condensate flow channels are provided with front condensate joints, lower condensate joints and rear condensate joints, the switching components are used for switching the two states of the front air joints communicated with the rear air joints and the front air joints communicated with the upper air joints in the air flow channels, and the two states of the front condensate joints communicated with the rear condensate joints and the front condensate joints communicated with the lower condensate joints in the condensate flow channels, the condenser coils and the air pipes are provided with condenser pipe end outlets and air pipe end outlets, air is communicated with heat preservation board houses through the air pipe ends, and the condenser pipe end outlets are communicated with the outside.

[0006] In a possible implementation, the liquid collecting pipe is sealingly connected with the lower opening of the rotary air duct, a flow guide bottom plate is arranged in the liquid collecting pipe, the flow guide bottom plate is inclined towards a vertical flow guide pipe, the vertical flow guide pipe is communicated with the automatic opening and closing box, so that the condensate water generated after the wet gas passes through the rotary air duct is gathered downwards into the liquid collecting pipe, and the condensate water is collected along the flow guide bottom plate to the vertical flow guide pipe at the bottom end under the action of gravity, and finally enters the automatic opening and closing box through the vertical flow guide pipe.

[0007] In a possible implementation, a plurality of condensate inlets are arranged at the upper portion of the automatic opening and closing box, the vertical flow guide pipe of the liquid collecting pipe is connected with the condensate inlets, so as to guide the condensate into the collecting cavity, a rotating shaft is rotatably arranged in the collecting cavity, the rotating shaft is sealingly connected with the collecting cavity, and the rotating shaft is provided with a second connecting rod, a third connecting rod and a fourth connecting rod, a second baffle is fixed at the end of the second connecting rod, a floating plate is fixed at the end of the third connecting rod, and a first baffle is fixed at the end of the fourth connecting rod.

[0008] In a possible implementation, the automatic distribution device comprises a first flow channel arranged horizontally at the upper portion, a second flow channel arranged horizontally at the lower portion, and a third flow channel arranged vertically, the upper portion of the third flow channel being in communication with the first flow channel, and the lower portion of the third flow channel being in communication with the second flow channel, the front end of the first flow channel being connected with the front air joint, and the rear end of the first flow channel being connected with the rear air joint; the front end of the second flow channel being connected with the front condensing joint, and the rear end of the second flow channel being connected with the rear condensing joint, the upper end of the third flow channel being connected with the upper air joint, and the lower end of the third flow channel being connected with the lower condensing joint, the automatic distribution device further comprising a mounting cavity arranged in the main body of the automatic distribution device, an electromagnet and a temperature sensing assembly being arranged in the mounting cavity, a magnetic conductive ring being arranged in the third flow channel, the magnetic conductive ring being connected with the electromagnet, a return spring being arranged in the magnetic conductive ring, one switching switch being connected with the upper end and the lower end of the return spring respectively, a direct current flow channel being arranged at the side of the switching switch close to the magnetic conductive ring, and a right-angle flow channel being arranged at the side of the switching switch away from the magnetic conductive ring.

[0009] In a possible implementation, the switching switch comprises a vertical baffle plate arranged at the upper portion, the vertical baffle plate being a circular arc plate, the vertical baffle plate being arranged towards the front air joint, the first horizontal baffle plate being connected with the side of the front air joint close to the magnetic conductive ring, the first horizontal baffle plate being connected with the first connecting rod at the side close to the magnetic conductive ring, the second horizontal baffle plate being connected with the end of the first connecting rod, the first horizontal baffle plate and the second horizontal baffle plate both being circular plates with sizes adapted to the third flow channel.

[0010] In a possible implementation, the temperature sensing assembly comprises a first bimetallic strip and a second bimetallic strip, the first bimetallic strip being connected with the first heat conduction ring arranged at the side of the first flow channel close to the front air joint, the second bimetallic strip being connected with the second heat conduction ring arranged at the side of the second flow channel close to the front condensing joint, and the first bimetallic strip and the second bimetallic strip being spaced apart and having the same bending direction.

[0011] In a possible implementation, the plate heat exchange structure comprises a first heat exchange plate and a second heat exchange plate, the first heat exchange plate and the second heat exchange plate forming a rotary air duct with an open upper portion, a sealed lower portion, and a separated middle portion, and the second heat exchange plate and the next first heat exchange plate forming a straight air duct penetrating in the horizontal direction.

[0012] In a possible implementation, the first heat exchange plate comprises a first main plate body, the first main plate body being provided with a partition plate at the middle portion, the first main plate body being provided with a left side folded edge and a right side folded edge at the left side and the right side respectively, the second heat exchange plate comprising a second main plate body, the second main plate body being provided with an upper side folded edge and a lower side folded edge at the upper side and the lower side respectively.

[0013] In a possible implementation, an automatic drying device for starch product production comprises a heat-insulating board house, an opening is arranged at one end of the heat-insulating board house, an inlet and outlet door is arranged at the opening, a high-temperature-resistant circumfluent fan set is arranged at the left end of the heat-insulating board house, an up-down circulating return air plate is fixed to the upper part of the high-temperature-resistant circumfluent fan set, a guide fan is arranged on the up-down circulating return air plate near the end close to the inlet and outlet door, the high-temperature-resistant circumfluent fan set is spaced apart from the left end of the heat-insulating board house, a waste heat recovery heat exchanger is arranged on the top of the heat-insulating board house, a wet air extraction port of the waste heat recovery heat exchanger is communicated with the top of the heat-insulating board house, a wet air discharge port of the waste heat recovery heat exchanger is communicated with the outside, an air extraction port of the waste heat recovery heat exchanger is communicated with the outside, and an air discharge port of the waste heat recovery heat exchanger is communicated with the inside of the heat-insulating board house, and the waste heat recovery heat exchanger is internally provided with the above-mentioned plate heat exchanger assembly.

[0014] It should be understood that the general description above and the following detailed description are only exemplary and cannot limit the present application.

[0015] In the present application, when the temperature of the condensate in the condensing coil is greater than the temperature of the air in the air pipe, the air can enter the next air pipe, and the condensate can enter the next condensing coil, so as to continue the heat exchange operation, and when the temperature of the condensate in the condensing coil is less than or equal to the temperature of the air in the air pipe, the air in the air pipe is sent into the straight-flow air duct of the plate heat exchanger assembly to continue the heat exchange and then is sent into the heat-insulating board house, and the condensate is directly discharged through the lower condensing joint, so as to fully utilize the waste heat of the condensate. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a three-dimensional structural schematic view of an automatic drying device for starch product production provided by an embodiment of the present application; Figure 2 FIG. 2 is a rear side structural schematic view of the automatic drying device for starch product production provided by the embodiment of the present application; Figure 3 FIG. 3 is a three-dimensional structural schematic view of a plate heat exchanger assembly provided by the embodiment of the present application; Figure 4 FIG. 4 is a main view of the plate heat exchanger assembly provided by the embodiment of the present application after removing the frame body; Figure 5 FIG. 5 is a rear view of the plate heat exchanger assembly provided by the embodiment of the present application after removing the frame body; Figure 6 FIG. 6 is a three-dimensional structural schematic view of a first heat exchange plate of the plate heat exchanger assembly provided by the embodiment of the present application; Figure 7 FIG. 7 is a three-dimensional structural schematic view of a second heat exchange plate of the plate heat exchanger assembly provided by the embodiment of the present application; Figure 8A structural schematic view of a housing of a plate heat exchange assembly provided by an embodiment of the present application; Figure 9 A partial enlarged structural schematic view of a plate heat exchange assembly provided by an embodiment of the present application; Figure 10 A partial enlarged structural schematic view of a plate heat exchange assembly provided by an embodiment of the present application; Figure 11 A partial enlarged structural schematic view of a plate heat exchange assembly provided by an embodiment of the present application; Figure 12 A structural schematic view of an automatic opening and closing box of a plate heat exchange assembly provided by an embodiment of the present application; Figure 13 A structural schematic view of an automatic opening and closing box of a plate heat exchange assembly provided by an embodiment of the present application; Figure 14 A structural schematic view of an automatic distribution device of a plate heat exchange assembly provided by an embodiment of the present application; Figure 15 An exploded structural schematic view of an electromagnet, a magnetic conducting ring, a reset spring and a switching switch of a plate heat exchange assembly provided by an embodiment of the present application; Figure 16 A structural schematic view of a switching switch of a plate heat exchange assembly provided by an embodiment of the present application.

[0017] Reference signs: 1, inlet and outlet door; 2, heat preservation board house; 3, drying cavity; 4, flow guide fan; 5, up and down circulating return air plate; 6, high temperature resistant flow fan group; 7, hot air machine; 8, waste heat recovery heat exchanger; 9, air outlet; 10, moisture outlet; 11, moisture outlet; 12, air outlet; 13, corner connecting piece; 14, end plate; 15, heat exchange core; 16, moisture inlet; 17, partition; 18, moisture outlet; 19, air inlet; 20, first heat exchange plate; 21, second heat exchange plate; 22, shell; 23, air outlet; 24, air pipe end outlet; 25, condensing pipe end outlet; 26, right side folding edge; 27, left side folding edge; 28, first main plate body; 29, second main plate body; 30, upper side folding edge; 31, lower side folding edge; 32, air pipe rear perforation; 33, condensing pipe rear perforation; 34, condensing joint lower perforation; 35, air pipe front perforation; 36, rotating shaft perforation; 37, automatic distribution device; 38, condensing coil; 39, air pipe; 40, liquid collecting pipe; 41, first baffle; 42, automatic opening and closing box; 43, flow guide bottom plate; 44, air joint upper perforation; 45, upper air joint; 46, rear air joint; 47, rear condensing joint; 48, lower condensing joint; 49, front condensing joint; 50, front air joint; 51, first heat conducting ring; 52, second heat conducting ring; 53, first bimetallic strip; 54, second bimetallic strip; 55, electromagnet; 56, first flow channel; 57, switch; 58, mounting hole; 59, return spring; 60, magnet conducting ring; 61, second flow channel; 62, floating plate; 63, third flow channel; 64, mounting cavity; 65, vertical flow blocking plate; 66, circumferential limiting sliding groove; 67, first horizontal flow blocking plate; 68, first connecting rod; 69, second horizontal flow blocking plate; 70, second baffle; 71, collection cavity; 72, condensate inlet; 73, second connecting rod; 74, third connecting rod; 75, rotating shaft; 76, fourth connecting rod. DETAILED DESCRIPTION

[0018] The embodiments of the present application will be described below in conjunction with the accompanying drawings of the embodiments of the present application.

[0019] An automatic drying device for starch product production is an important equipment in starch product processing, which is used for drying starch products such as vermicelli and dough skin, including air flow dryer, belt dryer, rotary flash dryer and other types. In the prior art, polyurethane rock wool boards are generally spliced into a sealed drying house. Left and right circulating flow channels or up and down circulating flow channels can be arranged in the drying house. High temperature resistant flow fans are arranged in the flow channels to drive hot air to circulate and generate turbulence. At the same time, a hot air machine 7 is provided in the drying house to provide drying hot air. A waste heat recovery heat exchanger 8 is used for waste heat recovery and moisture discharge.

[0020] However, in the prior art, although a condensate water collecting structure is provided, a condensate water waste heat recovery structure is generally not provided. For example, CN202211342072.5 discloses a heat exchange plate module and a gas-gas plate heat exchanger adapted thereto. In the heat exchanger, the liquid moving forward is attached to the surface of the vertical or horizontal inclined strip and is collected together downward due to the action of gravity to avoid the water moving with the gas to the next device, thereby improving the service life of the device and ensuring the normal operation of the device. When the liquid in the liquid collecting pipe reaches a certain weight, the sealing gasket moves downward, so that the water in the liquid collecting pipe is discharged through the gap between the fixed pipe and the sealing gasket, thereby avoiding the phenomenon of air leakage during the drainage operation and ensuring the heat exchange performance.

[0021] Although some condensate water waste heat recovery structures are installed, the generation of condensate water during the drying process of the starch product is related to the humidity of the starch product and the drying degree of the starch product. Therefore, the generation of condensate water during the drying of the starch product is not quantitative. Only when the humidity of the starch product is high and the amount of condensate water collected is large, the condensate water has heat exchange value. When the amount of condensate water is small, the heat is quickly lost and cannot be exchanged from the condensate water.

[0022] Therefore, the present application provides an automatic drying device for starch product production, which is provided with a plate heat exchange assembly inside. The amount and temperature of the condensate water can be automatically introduced into the air for heat exchange. When the air and the condensate water are stable, one part of the heat exchanged condensate water is discharged, and the other part of the air is introduced into the drying room, so that the waste heat of the condensate water can be fully utilized.

[0023] Specifically, as shown in Figure 1 The automatic drying device for starch product production includes a heat preservation board house 2, which is combined by 10 centimeter polyurethane rock wool boards to form a 30 cubic meter rectangular drying room. The heat preservation board house 2 is provided with a drying cavity 3 having an opening at one end. An inlet and outlet door 1 is arranged at the opening. A high-temperature resistant circular flow fan group 6 is arranged at the left end of the heat preservation board house 2. The high-temperature resistant circular flow fan group 6 includes 12 high-temperature resistant circular flow fans. An up-down circulating air return plate 5 is fixed to the upper part of the high-temperature resistant circular flow fan group 6. A guide fan 4 is arranged on the up-down circulating air return plate 5 near the inlet and outlet door 1. The high-temperature resistant circular flow fan group 6 is spaced apart from the left end of the heat preservation board house 2. A 30 kilowatt hot air fan 7 is installed at the left end of the outer side of the heat preservation board house 2. The air supply port of the hot air fan 7 is communicated to the inside of the heat preservation board house 2. A waste heat recovery heat exchanger 8 is arranged at the top of the heat preservation board house 2. A dehumidified air outlet 11 of the waste heat recovery heat exchanger 8 is communicated to the top of the heat preservation board house 2. A dehumidified air outlet 10 of the waste heat recovery heat exchanger 8 is communicated to the outside. A dehumidified air outlet 9 of the waste heat recovery heat exchanger 8 is communicated to the outside. An air outlet 12 of the waste heat recovery heat exchanger 8 is communicated to the inside of the heat preservation board house 2.

[0024] The exhaust air outlet 9 and the exhaust air outlet 10 are provided with a fan, the ambient temperature at the exhaust air outlet 9 and the exhaust air outlet 10 is basically the same as the outdoor temperature, and the humidity is basically the same as the external environment, the use requirement of the fan is reduced, the cost of the fan can be reduced, and therefore the fan is installed at the exhaust air outlet 9 and the exhaust air outlet 10.

[0025] The waste heat recovery heat exchanger 8 is provided with a plate heat exchange assembly, the plate heat exchange assembly comprises a frame body, as shown in the figure, Figure 3 The frame body comprises end plates 14 at both ends, four corner connecting pieces 13 are arranged between the two end plates 14, and a heat exchange core 15 is fixedly installed in the frame body. As shown in the figure, Figures 4-5 The heat exchange core 15 comprises a plate heat exchange structure and a lower condensate recovery structure, the plate heat exchange structure comprises a plurality of first heat exchange plates 20 and second heat exchange plates 21 which are arranged at intervals, the inner side of the corner connecting piece 13 is tightly attached to the corner of the first heat exchange plate 20 and the second heat exchange plate 21, the first heat exchange plate 20 and the second heat exchange plate 21 form a rotary air duct which is open at the upper part, sealed at the lower part and separated at the middle part, and the second heat exchange plate 21 and the next first heat exchange plate 20 form a straight-through air duct which is transversely through, the humidity in the heat-insulated board house 2 is guided into the rotary air duct and then discharged to the outside, so as to convert heat to the first heat exchange plate 20 and the second heat exchange plate 21, and the air is guided into the straight-through air duct and then sent into the heat-insulated board house 2, so that the first heat exchange plate 20 and the second heat exchange plate 21 transfer heat to the air, thereby completing the heat exchange between the humidity and the air.

[0026] Further, as shown in the figure, Figure 6 The first heat exchange plate 20 comprises a first main plate body 28, a partition plate 17 is arranged in the middle of the first main plate body 28, and left and right folding edges 27 and 26 are arranged on the left and right sides of the first main plate body 28.

[0027] Further, as shown in the figure, Figure 7 The second heat exchange plate 21 comprises a second main plate body 29, and upper and lower folding edges 30 and 31 are arranged on the upper and lower sides of the second main plate body 29, as shown in the figure, Figure 11 A plurality of air joint upper perforations 44 are further formed in the lower folding edge 31, so that the upper air joint 45 of the automatic distribution device 37 can pass through the air joint upper perforation 44 to communicate with the straight-through air duct, so that the air receiving the condensate water waste heat can be combined with the air in the straight-through air duct, and the combined air is continuously sent into the heat-insulated board house 2.

[0028] Further, as shown in the figure, Figures 4-5As shown, the rotary air duct is formed by the interlayer of the first heat exchange plate 20 and the next adjacent second heat exchange plate 21, wherein the left and right folded edges 27 and 26 on both sides of the first heat exchange plate 20 are attached to the next adjacent second heat exchange plate 21 at the end, thereby forming a vertical passage through the upper and lower parts, and the middle partition plate 17 divides the vertical passage into two halves, and the partition plate 17 is spaced from the bottom of the first main plate body 28, so that the vertical passage can be connected at the lower part, forming a rotary air duct, as shown in Figure 10 As shown, the vertical passage is connected with the upper open liquid collecting pipe 40 at the bottom, the liquid collecting pipe 40 is sealingly connected with the lower opening of the vertical passage, and the flow guide bottom plate 43 is arranged in the liquid collecting pipe 40, the flow guide bottom plate 43 is inclined towards the vertical flow guide pipe, and the vertical flow guide pipe is connected with the automatic opening and closing box 42, so that the condensed water generated after the moisture passes through the rotary air duct will be collected into the liquid collecting pipe 40, and the condensed water will be collected along the flow guide bottom plate 43 to the bottom end of the vertical flow guide pipe under the action of gravity, and finally enter the automatic opening and closing box 42 for collection.

[0029] As shown in Figure 4 The upper opening of the rotary air duct is divided into a moisture inlet 16 and a moisture outlet 18, wherein the moisture inlet 16 is connected with the dehumidification port 11, and the moisture outlet 18 is connected with the exhaust port 10.

[0030] Further, as shown in Figure 9 , Figure 11 The straight air duct is formed by the interlayer of the second heat exchange plate 21 and the next adjacent first heat exchange plate 20, wherein the upper and lower folded edges 30 and 31 on both sides of the second heat exchange plate 21 are sealingly attached to the main plate body of the next adjacent first heat exchange plate 20, thereby forming a straight air duct enclosed on the top, bottom, left and right, and a plurality of air joint upper perforations 44 are formed on the lower folded edge 31, so that the upper air joint 45 of each automatic distribution device 37 can pass through the air joint upper perforation 44 and be connected with the straight air duct.

[0031] Further, as shown in Figure 9As shown, the condensation recovery structure includes a collecting pipe 40 for collecting condensed water, an automatic opening and closing box 42, a condensation coil 38 for conveying condensed liquid, an air pipe 39 for conveying air, the condensation coil 38 is coiled around the air pipe 39, so that the heat of the condensed liquid can be transferred to the air in the air pipe 39, thereby completing the heat exchange of the condensed liquid, the automatic opening and closing box 42 is used to collect condensed liquid while opening and closing the air pipe 39 and the inlet of the condensation coil 38, when the condensed liquid in the automatic opening and closing box 42 is sufficient, the first end of the air pipe 39 and the condensation coil 38 is opened, the condensed liquid can enter from the first end of the condensation coil 38, and the air can enter from the first end of the air pipe 39, a plurality of automatic distribution devices 37 are connected on the condensation coil 38 and the air pipe 39, so as to divide the condensation coil 38 and the air pipe 39 into multiple sections, the automatic distribution device 37 is provided with a temperature sensing component and air flow channels and condensed liquid flow channels that do not interfere with each other, wherein the air flow channel is provided with an inlet, an outlet and an upward air outlet; the condensed liquid flow channel is provided with an inlet, an outlet and a downward condensed liquid outlet; when the temperature sensing component detects that the temperature of the condensed liquid in the condensation coil 38 is greater than the temperature of the air in the air pipe 39, the inlet and the outlet of the air flow channel are communicated, and the inlet and the outlet of the condensed liquid flow channel are communicated, so that the condensed liquid in the condensation coil 38 and the air in the air pipe 39 can enter the next section; when the temperature sensing component detects that the temperature of the condensed liquid in the condensation coil 38 is less than or equal to the temperature of the air in the air pipe 39, the inlet of the air flow channel and the air outlet are communicated, so that the air that has completed heat exchange can flow into the straight-flow air duct, and the inlet of the condensed liquid flow channel and the condensed liquid outlet are communicated, so that the condensed liquid with lower temperature can be discharged in time; the condensation pipe end outlet 25 and the air pipe 39 end outlet 24 are arranged at the end of the condensation coil 38 and the air pipe 39, after the air flows out of the air pipe 39 end outlet 24, it is directly sent into the heat preservation board house 2 through the air outlet 12, and the condensed liquid is directly discharged to the outside through the condensation pipe end outlet 25.

[0032] Further, as Figures 12-13As shown, the automatic opening and closing box 42 is provided with a plurality of condensate inlets 72 at the upper portion, vertical flow guide pipes of the liquid collecting pipe 40 are connected to the condensate inlets 72, so as to guide the condensate into the collecting cavity 71, a rotating shaft 75 is rotatably installed in the collecting cavity 71, the rotating shaft 75 is in sealing and rotating connection with the collecting cavity 71, and the rotating shaft 75 is provided with a second connecting rod 73, a third connecting rod 74 and a fourth connecting rod 76, an end of the second connecting rod 73 is fixedly provided with a second baffle 70, an end of the third connecting rod 74 is fixedly provided with a floating plate 62, and an end of the fourth connecting rod 76 is fixedly provided with a first baffle 41, when the condensate in the collecting cavity 71 is less, the first baffle 41, the second baffle 70 and the floating plate 62 are directed to the front side under the action of gravity, at this time, the first baffle 41 blocks the first end inlet of the condensing coil 38, the second baffle 70 blocks the first end inlet of the air pipe 39, and the floating plate 62 abuts against the bottom plate of the collecting cavity 71; when the condensate in the collecting cavity 71 is sufficient, the floating plate 62 is floated upward, and at the same time, the first baffle 41 and the second baffle 70 no longer coincide with the first end inlet of the condensing coil 38 and the first end inlet of the air pipe 39, so that the condensate can enter the condensing coil, and the air can enter the air pipe 39, when the condensate in the collecting cavity 71 is discharged, the first baffle 41, the second baffle 70 and the floating plate 62 are directed to the front side again under the action of gravity, due to the height limitation of the collecting cavity 71, the first baffle 41, the second baffle 70 and the floating plate 62 will not be rotated to the rear side to the extent of the center of gravity under the action of buoyancy, so that the first baffle 41, the second baffle 70 and the floating plate 62 can always be reset under the action of gravity.

[0033] Further, as Figures 14-16As shown, the automatic dispensing device 37 includes a first flow channel 56 arranged horizontally at the upper part, a second flow channel 61 arranged at the lower part, and a third flow channel 63 arranged vertically. The upper part of the third flow channel 63 is connected to the first flow channel 56, and the lower part is connected to the second flow channel 61. The front end of the first flow channel 56 is connected to the front air connector 50, and the rear end is connected to the rear air connector 46. The front end of the second flow channel 61 is connected to the front condenser connector 49, and the rear end is connected to the rear condenser connector 47. The upper end of the third flow channel 63 is connected to the upper air connector 45, and the lower end is connected to the lower condenser connector 48. The automatic dispensing device 37 also has a mounting cavity 64, in which an electromagnet 55, a first bimetallic strip 53, and a second bimetallic strip 54 are installed. The first bimetallic strip 53 is connected to the first heat-conducting ring 51 located at the front air connector 50 end in the first flow channel 56. The second bimetallic strip 54 is connected to the second heat-conducting ring 52 located at the front condensation connector 49 end in the second flow channel 61. The first bimetallic strip 53 and the second bimetallic strip 54 are spaced apart and bent in the same direction, both bending upwards. A magnetic ring 60 is provided in the third flow channel 63. The magnetic ring 60 is connected to the electromagnet 55. A return spring 59 is provided in the magnetic ring 60. A switch 57 is connected to the upper and lower ends of the return spring 59. A DC flow channel is provided at the end of the switch 57 near the magnetic ring 60, and a right-angle flow channel is provided at the end of the switch 57 away from the magnetic ring 60. When the temperature of the condensate on the lower side is greater than the temperature of the air on the upper side, the bending degree of the second bimetallic strip 54 is greater than that of the first bimetallic strip 53, so that the second bimetallic strip 54 overlaps with the first bimetallic strip 53. When the second bimetallic strip 54 overlaps with the first bimetallic strip 53, electricity is supplied to the inside of the electromagnet 55, and the two switching switches 57 move outward under the action of the reset spring 59. The switching switches 57 move away from the magnetic ring 60. The DC guide channel of the upper switching switch 57 is connected to the first flow channel 56, so that the front air connector 50 and the rear air connector 46 of the first flow channel 56 are connected. The DC guide channel of the lower switching switch 57 is connected to the second flow channel 61, so that the front condenser connector 49 and the rear condenser connector 47 of the second flow channel 61 are connected. When the temperature of the condensate in the condenser coil 38 is less than or equal to the temperature of the air in the air pipe 39, the second bimetallic strip 54 does not overlap the first bimetallic strip 53, power is supplied to the electromagnet 55, the magnetic ring 60 generates a magnetic force, which overcomes the elastic force of the return spring 59 and moves the switching switch 57 inward to approach the magnetic ring 60. The right-angled flow guide of the upper switching switch 57 is connected to the first flow channel 56 and the third flow channel 63, so that the front air joint 50 of the first flow channel 56 and the upper air joint 45 of the third flow channel 63 are in communication, and the right-angled flow guide of the lower switching switch 57 is connected to the second flow channel 61 and the third flow channel 63, so that the front condensate joint 49 of the second flow channel 61 and the lower condensate joint 48 of the third flow channel 63 are in communication. In this way, when the temperature of the condensate in the condenser coil 38 is greater than the temperature of the air in the air pipe 39, the air can enter the next section of the air pipe 39, and the condensate can enter the next section of the condenser coil 38, so as to continue the heat exchange operation. When the temperature of the condensate in the condenser coil 38 is less than or equal to the temperature of the air in the air pipe 39, the air in the air pipe 39 is sent into the straight-flow air duct of the plate heat exchange assembly for heat exchange and then into the heat preservation board house 2, and the condensate is directly discharged through the lower condensate joint 48, so as to fully utilize the waste heat of the condensate.

[0034] Further, as shown in Figures 15-16 The core of the electromagnet 55 is connected with the magnetic ring 60, and when the electromagnet 55 is powered, the core and the magnetic ring 60 can be magnetized together, so that the magnetic ring 60 can magnetically attract the upper and lower switching switches 57, and the two switching switches 57 move toward the magnetic ring 60 to switch the flow channel communication relationship. The return spring 59 is fixedly installed in the mounting hole 58 at the center of the magnetic ring 60, and the extension distance of the return spring 59 above and below the magnetic ring 60 is adapted.

[0035] Specifically, an electromagnetic relay switch is arranged in the circuit, the electromagnetic relay switch is controlled to be opened and closed by the second bimetallic strip 54 and the first bimetallic strip 53, the circuit is controlled to be turned on and off by the electromagnetic relay switch, a power supply and the electromagnet 55 are connected in the circuit, so that the second bimetallic strip 54 does not overlap the first bimetallic strip 53, and power is supplied to the electromagnet 55; the second bimetallic strip 54 overlaps the first bimetallic strip 53, and no power is supplied to the electromagnet 55.

[0036] Specifically, as shown in Figures 15-16As shown, the switch 57 includes an upper vertical baffle 65, which is a circular arc plate, arranged towards the front air joint 50, the front air joint 50 is connected with a first horizontal baffle 67 near one side of the magnetic ring 60, the first horizontal baffle 67 is connected with a first connecting rod 68 near one side of the magnetic ring 60, the first connecting rod 68 is connected with a second horizontal baffle 69 at the end, the first horizontal baffle 67 and the second horizontal baffle 69 are both circular with a size suitable for the third flow channel 63; when the switch 57 is away from the magnetic ring 60, the first horizontal baffle 67 and the second horizontal baffle 69 block the interface between the third flow channel 63 and the first flow channel 56 and the second flow channel 61, the top of the upper vertical baffle 65 is in contact with the upper air joint 45 for limiting, and the top of the lower vertical baffle 65 is in contact with the lower condensation joint 48 for limiting, so that the front air joint 50 of the first flow channel 56 is in communication with the rear air joint 46, and the front condensation joint 49 of the second flow channel 61 is in communication with the rear condensation joint 47; when the switch 57 is close to the magnetic ring 60, the vertical baffle 65 of the upper switch 57 blocks the flow section of the first flow channel 56 to the rear air joint 46, the first horizontal baffle 67 blocks the interface between the first flow channel 56 and the lower flow section of the third flow channel 63, and the second horizontal baffle 69 is in contact with the upper side of the magnetic ring 60 for limiting, at this time, the front air joint 50 is in communication with the upper air joint 45; the vertical baffle 65 of the lower switch 57 blocks the flow section of the second flow channel 61 to the rear condensation joint 47, the first horizontal baffle 67 blocks the interface between the second flow channel 61 and the upper flow section of the third flow channel 63, and the second horizontal baffle 69 is in contact with the lower side of the magnetic ring 60 for limiting, at this time, the front condensation joint 49 is in communication with the lower condensation joint 48.

[0037] Specifically, as shown in the figure, Figure 16 the vertical baffle 65, the first horizontal baffle 67 and the second horizontal baffle 69 of the switch 57 are provided with a circumferential limiting sliding groove 66 on one side, the third flow channel 63 is provided with a limiting structure suitable therefor, the limiting structure extends into the limiting sliding groove, so that the switch 57 can slide up and down in the third flow channel 63 without rotating itself.

[0038] Further, as shown in the figure, Figure 4 , Figure 5 and Figure 8As shown, the plate heat exchanger structure lower part is further fixed with a shell 22, the shell 22 is provided with an air pipe 39 front perforation 35, a rotating shaft 75 perforation 36 on the side of the air inlet 19, the air pipe 39 front perforation 35 is provided with an air pipe 39 first end, the rotating shaft 75 perforation 36 is provided with a rotating shaft 75, so that the shell 22 does not affect the rotation of the rotating shaft 75, and when the first baffle 41 does not block the air pipe 39 first end, the air drawn from the outside can be sent into the air pipe 39; the lower side of the shell 22 is provided with a condensing joint lower perforation 34, the lower condensing joint 48 of each automatic distribution device 37 passes through the condensing joint lower perforation 34, so that the condensed liquid discharged from the lower condensing joint 48 can be discharged to the outside; the rear side of the shell 22 is provided with an air pipe 39 rear perforation 32, a condensing pipe rear perforation 33, wherein the air pipe 39 rear perforation 32 is in sealed communication with the air outlet 12, so that the air flowing out of the air pipe 39 rear perforation 32 can enter the air outlet 12 and then enter the insulation board house 2, and the condensing pipe rear perforation 33 is in communication with the outside, so that the condensed liquid flowing out of the condensing pipe rear perforation 33 can be discharged to the outside, and a collection device can be provided outside to collect the condensed liquid discharged from the condensing pipe rear perforation 33 and the lower condensing joint 48, by providing the shell 22, the air can only enter the air pipe 39 and the straight-flow air duct, and will not enter the condensing recovery structure.

[0039] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application; in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A plate heat exchanger assembly comprising a frame in which a heat exchanger core is mounted, characterized in that The heat exchange core comprises a plate heat exchange structure at the upper portion and a condensate recovery structure at the lower portion; the plate heat exchange structure is formed with spaced apart moisture channels and air channels, wherein the moisture channels are U-shaped rotary air ducts with openings at the upper portion, and the air channels are straight channels; the condensate recovery structure comprises a liquid collecting pipe arranged at the opening of the rotary air duct at the bottom portion, and the liquid collecting pipe is connected to an automatic opening and closing box; the plate heat exchange structure is provided with condenser coils and air pipes at the lower portion; the condenser coils penetrate into the automatic opening and closing box at the first ends thereof; the air pipes are in communication with air extraction ports at the first ends thereof; the automatic opening and closing box is provided with a liquid float switch for opening and closing the first ends of the condenser coils and the air pipes; the condenser coils and the air pipes are connected with a plurality of automatic distribution devices; the automatic distribution devices are provided with temperature sensing components and air flow channels, condensate flow channels and switching components which are independent of each other; the air flow channels are provided with front air joints, upper air joints and rear air joints; the condensate flow channels are provided with front condensate joints, lower condensate joints and rear condensate joints; the switching components are used to switch the front air joints and the rear air joints in the air flow channels to be in communication, the front air joints and the upper air joints to be in communication, the front condensate joints and the rear condensate joints in the condensate flow channels to be in communication, and the front condensate joints and the lower condensate joints to be in communication; the condenser coils and the air pipes are provided with condenser pipe end outlets and air pipe end outlets at the second ends thereof; the air is communicated with the heat preservation board house through the air pipe end; and the condenser pipe end outlets are in communication with the outside.

2. A plate heat exchanger package according to claim 1, characterized in that The liquid collecting pipe is sealingly connected with the lower opening of the rotary air duct; the liquid collecting pipe is provided with a flow guide bottom plate; the flow guide bottom plate is inclined towards a vertical flow guide pipe; and the vertical flow guide pipe is in communication with the automatic opening and closing box, so that the condensate water generated after the moisture passes through the rotary air duct is gathered downwardly into the liquid collecting pipe, and the condensate water is collected along the flow guide bottom plate to the vertical flow guide pipe at the bottom end under the action of gravity, and finally enters the automatic opening and closing box through the vertical flow guide pipe.

3. A plate heat exchanger package according to claim 2, characterized in that The automatic opening and closing box is provided with a plurality of condensate inlets at the upper portion; the vertical flow guide pipe of the liquid collecting pipe is connected to the condensate inlets, so as to guide the condensate into the collecting cavity; a rotating shaft is rotatably installed in the collecting cavity; the rotating shaft is sealingly rotatably connected with the collecting cavity; the rotating shaft is provided with a second connecting rod, a third connecting rod and a fourth connecting rod; a second baffle is fixed at the end of the second connecting rod; a floating plate is fixed at the end of the third connecting rod; and a first baffle is fixed at the end of the fourth connecting rod.

4. A plate heat exchanger assembly according to claim 1, characterized in that The automatic distribution device comprises a first flow channel arranged horizontally at the upper part, a second flow channel arranged horizontally at the lower part, and a third flow channel arranged vertically, the upper part of the third flow channel is communicated with the first flow channel, and the lower part of the third flow channel is communicated with the second flow channel, the front end of the first flow channel is connected with the front air joint, and the rear end of the first flow channel is connected with the rear air joint; the front end of the second flow channel is connected with the front condensing joint, and the rear end of the second flow channel is connected with the rear condensing joint, the upper end of the third flow channel is connected with the upper air joint, and the lower end of the third flow channel is connected with the lower condensing joint, the automatic distribution device body is further provided with a mounting cavity, an electromagnet and a temperature sensing assembly are arranged in the mounting cavity, a magnetic conducting ring is arranged in the third flow channel, the magnetic conducting ring is connected with the electromagnet, a reset spring is arranged in the magnetic conducting ring, one switching switch is connected with the upper end and the lower end of the reset spring respectively, a direct current flow channel is arranged at the end of the switching switch close to the magnetic conducting ring, and a right-angle flow channel is arranged at the end of the switching switch away from the magnetic conducting ring.

5. A plate heat exchanger package according to claim 4, characterized in that The switching switch comprises a vertical baffle plate arranged at the upper part, the vertical baffle plate is a circular arc plate, the vertical baffle plate is arranged towards the front air joint, the first horizontal baffle plate is connected with the side close to the magnetic conducting ring of the front air joint, the first connecting rod is connected with the side close to the magnetic conducting ring of the first horizontal baffle plate, the second horizontal baffle plate is connected with the tail end of the first connecting rod, and the first horizontal baffle plate and the second horizontal baffle plate are both circular plates with sizes adapted to the third flow channel.

6. A plate heat exchanger package according to claim 4, characterised in that The temperature sensing assembly comprises a first bimetallic strip and a second bimetallic strip, the first bimetallic strip is connected with a first heat conducting ring arranged at the end of the first flow channel close to the front air joint, the second bimetallic strip is connected with a second heat conducting ring arranged at the end of the second flow channel close to the front condensing joint, and the first bimetallic strip and the second bimetallic strip are spaced apart and have the same bending direction.

7. A plate heat exchanger assembly according to claim 1, characterized in that The plate heat exchange structure comprises a first heat exchange plate and a second heat exchange plate, the first heat exchange plate and the second heat exchange plate form a rotary air duct with an open upper part, a sealed lower part and a separated middle part, and the second heat exchange plate and the next first heat exchange plate form a straight air duct penetrating in the horizontal direction.

8. A plate heat exchanger package according to claim 7, characterised in that The first heat exchange plate comprises a first main plate body, a partition plate is arranged in the middle of the first main plate body, left and right side folding edges are arranged at the left and right sides of the first main plate body, the second heat exchange plate comprises a second main plate body, and upper and lower side folding edges are arranged at the upper and lower sides of the second main plate body.

9. An automatic drying device for starch product production, characterized in that, The heat preservation board house is provided with an opening at one end, an inlet and outlet door is arranged at the opening, a high-temperature-resistant circular flow fan set is arranged at the left end of the heat preservation board house, an up-down circulating air return plate is fixed to the upper part of the high-temperature-resistant circular flow fan set, a guide fan is arranged at the end of the up-down circulating air return plate close to the inlet and outlet door, the high-temperature-resistant circular flow fan set is spaced apart from the left end of the heat preservation board house, a waste heat recovery heat exchanger is arranged on the top of the heat preservation board house, a wet air extraction port of the waste heat recovery heat exchanger is communicated with the top of the heat preservation board house, a wet air discharge port of the waste heat recovery heat exchanger is communicated with the outside, an air extraction port of the waste heat recovery heat exchanger is communicated with the outside, and an air discharge port of the waste heat recovery heat exchanger is communicated with the inside of the heat preservation board house, and the waste heat recovery heat exchanger is provided with the plate heat exchange assembly according to any one of claims 1-8.

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