CN108534477B - Drying system - Google Patents

Drying system Download PDF

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Publication number
CN108534477B
CN108534477B CN201810354165.7A CN201810354165A CN108534477B CN 108534477 B CN108534477 B CN 108534477B CN 201810354165 A CN201810354165 A CN 201810354165A CN 108534477 B CN108534477 B CN 108534477B
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air
valve
drying
port
pipe
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CN108534477A (en
Inventor
向立平
王汉青
黄坤荣
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Nanhua University
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Nanhua University
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001Drying-air generating units, e.g. movable, independent of drying enclosure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00Heating arrangements

Abstract

The invention discloses a drying system which comprises a heat pump unit and a drying chamber, wherein a cold air pipe for leading in cold air and an air supply pipe for leading out hot air are arranged on the heat pump unit, an air supply outlet is fully distributed on the side wall of one side of the drying chamber, an air outlet is fully distributed on the side wall of the other side of the drying chamber, the air supply pipe is communicated with the air supply outlet, a first exhaust pipe and a second exhaust pipe are communicated with the air outlet, the first exhaust pipe is communicated with the outside, and the second exhaust pipe is communicated with the heat pump unit. The drying system can easily realize synchronous drying of materials in different areas in the drying chamber through the structural design, greatly optimize the drying quality of the materials and reduce the energy consumption and time for system operation.

Description

Drying system
Technical Field
The invention relates to the field of drying equipment, in particular to a drying system.
Background
Drying broadly refers to various operations for removing moisture or other moisture from a wet material. For example: in daily life, the wet materials are exposed to the sun to remove water; industrially removing moisture in air, industrial gas or organic liquid by using silica gel, lime, concentrated sulfuric acid and the like; in chemical production, wet solid materials are heated by hot air, flue gas, infrared rays and the like by means of heat and mass transfer, so that moisture or a solvent contained in the wet solid materials is vaporized and removed. The purpose of drying is to make the material convenient for storage, transport and use, or to meet the requirements for further processing. For example, grains and vegetables can be stored for a long time after being dried; after the synthetic resin is dried, bubbles or moire can be prevented from appearing in the plastic product; the paper is convenient to use and store after being dried. Because the dried product has a plurality of advantages, the drying is widely applied to various departments such as chemical industry, food, light industry, textile, coal, agriculture and forestry product processing, building materials and the like, and various drying devices are produced at the same time.
At present, a heat pump drying device is a drying device commonly used at present. In the specific implementation process, the heat pump drying equipment utilizes the heat pump to produce heat, then utilizes the heat to circularly heat the air, then uses hot air formed after heating to bake and separate out moisture in the materials to be dried in the drying chamber and transfer the moisture into water vapor, and then the water vapor and the air are mixed into humid air to be discharged together, thereby realizing the dehumidification and drying of the materials. In the actual operation process, because the limitation of current heat pump drying equipment structural design, the import and the export of air cycle business turn over drying chamber are single square or round mouth usually, the hot and dry air gets into the indoor redistribution of drying, discharge again after the cold and humid air contracts in the drying chamber, so, the resistance that leads to the air to get into the drying chamber is very big, cause wind speed and the amount of wind inhomogeneous in the drying chamber, especially four angles of drying chamber often are the dead angle of ventilation, lead to the material drying progress nonconformity in different regions in the drying chamber, greatly influenced the drying quality of material, the energy consumption and the time of increase system operation.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a drying system, and the drying system can easily realize synchronous drying of materials in different areas in a drying chamber through the structural design of the drying system, greatly optimize the drying quality of the materials, and reduce the energy consumption and time for system operation.
The utility model provides a drying system, includes heat pump set and drying chamber, be provided with on the heat pump set and be used for the leading-in cold blast pipe of cold wind and the blast pipe that is used for hot-blast derivation, full cloth has the supply-air outlet on the lateral wall of drying chamber one side, full cloth has the air outlet on the lateral wall of drying chamber opposite side, the blast pipe with the supply-air outlet switches on mutually, the intercommunication has first exhaust pipe and second exhaust pipe on the air outlet, first exhaust pipe switches on mutually with the outside, the second exhaust pipe with the heat pump set switches on mutually.
Preferably, the air supply outlets are uniformly distributed on the side wall of the left side of the drying chamber from top to bottom, and the air outlets are uniformly distributed on the side wall of the right side of the drying chamber from top to bottom.
Preferably, an air supply chamber is arranged between the air supply pipe and the air supply outlet, and an air return chamber is arranged between the air outlet and the first exhaust pipe and between the air outlet and the second exhaust pipe.
Preferably, the air supply outlets are uniformly distributed on the upper side wall of the drying chamber from left to right, and the air outlets are uniformly distributed on the lower side wall of the drying chamber from left to right.
Preferably, the cold air pipe penetrates through the first exhaust pipe, a total heat exchanger is wrapped on the cold air pipe, and the total heat exchanger is used for transferring heat in the first exhaust pipe to the inner cavity of the cold air pipe.
Preferably, the heat pump unit comprises a case with an internal ventilation valve, a fresh air port with a fresh air valve and communicated with the outside, an air supply port with an air supply machine and communicated with the air supply pipe, a heat recovery air port communicated with the cold air pipe and the second exhaust pipe, and an air inlet provided with a fresh air temperature sensor and a fresh air humidity sensor and communicated with the outside are sequentially arranged on the side wall above the case from left to right, an external cold and heat surface cooler and an external air fan are arranged on the side wall on the right side of the case, and a total return air port communicated with the second exhaust pipe is arranged on the side wall on the left side of the case; a pipe valve assembly is arranged in the inner cavity of the case, a compressor is connected below the pipe valve assembly, and a dehumidification surface air cooler and an inner cooling and heating surface air cooler are connected to the left side of the pipe valve assembly; the right side of the pipe valve assembly is connected with the external cold and hot surface cooler.
Preferably, a primary air return opening and a secondary air return opening are arranged in the main air return opening, a primary air return adjusting plate is arranged in the primary air return opening, and a secondary air return adjusting plate is arranged in the secondary air return opening.
Preferably, the pipe valve assembly comprises a front four-way valve, a rear four-way valve, an external cooling electromagnetic valve, a dehumidification electromagnetic valve, a rear cooling electromagnetic valve, an expansion valve, a first one-way valve, a second one-way valve, a third one-way valve, a fourth one-way valve and a fifth one-way valve, wherein the exhaust port of the compressor is connected with the port D of the front four-way valve, the port E of the front four-way valve is connected with the port D of the rear four-way valve, the port C of the front four-way valve is connected with one end of the internal cooling surface cooler, the ports S of the front four-way valve and the rear four-way valve are connected in parallel with the return port of the compressor, the port E of the rear four-way valve is connected with one end of the dehumidification surface cooler, the port C of the rear four-way valve is connected with one end of the external cooling surface cooler, the other end of the external cold and hot surface cooler, the outlet of the second one-way valve and the inlet of the third one-way valve are connected in parallel, the other end of the dehumidification surface cooler is connected with the outlet of the first one-way valve, the inlet of the first one-way valve is connected with one end of the dehumidification electromagnetic valve, the inlet of the second one-way valve is connected with one end of the external cold and hot electromagnetic valve, the outlet of the third one-way valve, the outlet of the fourth one-way valve and the inlet of the expansion valve are connected in parallel, the inlet of the fifth one-way valve is connected with one end of the back cold electromagnetic valve, the other end of the external cold and hot electromagnetic valve, the other end of the back cold electromagnetic valve and the outlet of.
Preferably, the heat pump unit is provided with a ventilation drying mode, a combined drying mode and an air-conditioning refrigeration mode, wherein:
the through-air drying mode comprises the following procedures: firstly, drying by ventilation and secondly, shutting down;
the combined drying mode includes the following steps: ventilation drying, shutdown conversion, return air heating and wet air discharge, return air heating, return air refrigeration and wet air discharge, return air heating and return air refrigeration, and return air heating and return air refrigeration and wet air discharge;
the air-conditioning cooling mode includes the following steps: air cooling, primary cooling, secondary cooling and standby.
The invention has the beneficial effects that: when the drying system provided by the invention is used specifically, ventilation drying is firstly carried out when the air content in the drying chambers is higher, namely, ventilation drying is firstly carried out when the material moisture is higher and the moisture on the surface layer of the material evaporates faster, and the circulating return air is heated and dried by utilizing a heat pump unit after the ventilation drying is carried out to a certain degree; if the air in the drying chamber has low moisture, the circulating return air is directly heated and dried by using the heat pump unit, and due to the ingenuity of the design of the air channel, the synchronous and effective drying of materials in each area in the whole drying chamber can be effectively realized during the specific drying; in addition, when the heat pump unit works, water in the materials is heated and evaporated to be mixed with air, and then return air heating and wet air discharging and drying are carried out, or return air heating and refrigeration drying and wet air discharging and drying are carried out simultaneously, so that the dehumidification amount and the heat utilization of the system provided by the invention are maximized, and the materials are enabled to obtain higher dryness.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic view of the overall structure of a drying system disclosed in example 1 of the present invention;
FIG. 2 is a schematic structural diagram of a heat pump unit disclosed in embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a blowing chamber disclosed in embodiment 1 of the present invention;
fig. 4 is a schematic structural view of the air return chamber disclosed in embodiment 1 of the present invention;
FIG. 5 is a schematic view of the connection of the pipe valve assembly in the return air heating state disclosed in embodiment 2 of the present invention;
fig. 6 is a schematic connection diagram of the pipe valve assembly in the return air heating and dehumidifying state disclosed in embodiment 2 of the present invention;
FIG. 7 is a schematic view of the connection of the pipe valve assembly in the high temperature return air refrigeration state disclosed in embodiment 2 of the present invention;
FIG. 8 is a schematic view of the connection of the pipe valve assembly in the return air low-temperature refrigeration state disclosed in embodiment 2 of the present invention;
fig. 9 is a schematic view of the overall structure of the drying system disclosed in embodiment 3 of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Example 1:
referring to fig. 1 to 4, fig. 1 to 4 provide an embodiment of a drying system according to the present invention, wherein fig. 1 is a schematic structural diagram of the drying system disclosed in embodiment 1 of the present invention; FIG. 2 is a schematic structural diagram of a heat pump unit disclosed in embodiment 1 of the present invention; fig. 3 is a schematic structural view of a blowing chamber disclosed in embodiment 1 of the present invention; fig. 4 is a schematic structural view of the air return chamber disclosed in embodiment 1 of the present invention.
As shown in fig. 1 to 4, the drying system provided by the invention can realize synchronous drying of materials in different areas in the drying chamber, greatly optimize the drying quality of the materials, and reduce the energy consumption and time for system operation. The drying system comprises a heat pump unit 1, a drying chamber 2 with an air supply opening 201 and an air outlet 202, a cold air pipe 3, an air supply pipe 4, a first exhaust pipe 5, a second exhaust pipe 6, an air supply chamber 7, an air return chamber 8 and a total heat exchanger 9. The arrows in the drawings indicate the direction of flow of the air.
In the scheme, the drying system comprises a heat pump unit 1, wherein the heat pump unit 1 is used for providing power output for drying of the system, and comprises power required by air flowing in the drying system and heating and refrigerating required by material drying.
The drying chamber 2 is used for providing a drying space for the materials, and the specific structure and the size of the drying chamber 2 are selected and designed according to actual requirements. The scheme selects a cuboid-shaped drying chamber 2, and a heat pump unit 1 is connected to the right side of the drying chamber 2.
Be provided with on heat pump set 1 and be used for leading-in cold wind pipe 3 of cold wind and be used for blast pipe 4 of hot-blast derivation, it has supply-air outlet 201 to fill on 2 one side lateral walls of drying chamber, it has air outlet 202 to fill on 2 other opposite side lateral walls of drying chamber, blast pipe 4 switches on with supply-air outlet 201 mutually, the intercommunication has first exhaust pipe 5 and second exhaust pipe 6 on the air outlet 202, first exhaust pipe 5 switches on with the outside mutually, second exhaust pipe 6 switches on with heat pump set 1 mutually.
In this scheme, supply-air outlet 201 from last down equipartition is on the left side lateral wall of drying chamber 2, and air outlet 202 from last down equipartition is on the right side lateral wall of drying chamber 2. An air supply chamber 7 is arranged between the air supply pipe 4 and the air supply port 201, and an air return chamber 8 is arranged between the air outlet 202 and the first exhaust pipe 5 and the second exhaust pipe 6. The horizontally arranged blowing chamber 7 and the horizontally arranged return air chamber 8 function as a plenum box. So, hot-blast left side supply-air outlet 201 that can follow drying chamber 2 is horizontal inputs to drying chamber 2's inner chamber, again from drying chamber 2 right side lateral wall air outlet 202 horizontal output, and the air flow region is covered with drying chamber 2 inside from last down whole height to can realize that the interior material of drying chamber 2 does not have the dead angle, synchronous drying.
In this scheme, supply-air outlet 201 from last down equipartition is on the left side lateral wall of drying chamber 2, and air outlet 202 from last down equipartition is on the right side lateral wall of drying chamber 2. Of course, other arrangements may be used. For example, the widths of the air supply opening 201 and the air outlet 202 are increased from top to bottom. In other words, the width of the air supply opening 201 is the same as that of the air outlet 202, but the distance between the adjacent air supply opening 201 and the air outlet 202 increases from top to bottom. So, through above-mentioned special design's a plurality of horizontal slot supply-air outlets 201 and horizontal slot air outlet 202, the level is sent to the hot-blast from the top down by little grow and is kept steady of drying room 2, makes the heat that the material in drying room 2 obtained from the top down by little grow and keep steady to can balance steam and rise slightly and make the phenomenon that the temperature is higher below in drying room 2 top, further reach the requirement that material drying time is unanimous basically about in the drying room 2.
In this scheme, for further making things convenient for the recycle of heating power, avoid the heat directly to discharge to cause the waste in the air, cold air duct 3 alternates in from first blast pipe 5 and passes through, and cold air duct 3 is wrapped and is equipped with full heat exchanger 9, and full heat exchanger 9 is used for the heat transfer in the first blast pipe 5 to the 3 inner chambers of cold air duct, so, can utilize the cold air of the interior air of first blast pipe 5 waste heat preheating cold air duct 3 inner chambers.
In the scheme, a high-efficiency and energy-saving heat pump unit is provided for further facilitating the output and control of power. The heat pump unit 1 includes a cabinet 101, a ventilation valve 102, a fresh air valve 103, a fresh air inlet 104, a blower 105, an air supply outlet 106, a heat recovery air inlet 107, an air inlet 108, an external cooling and heating surface cooler 109, an external blower 110, a total air return inlet 111, a pipe valve assembly 112, a compressor 113, a dehumidifying surface cooler 114 and an internal cooling and heating surface cooler 115.
The air conditioner is characterized in that a ventilation valve 102 is arranged in the case 101, the ventilation valve 102 is used for on-off control of each air path, a fresh air port 104 which is provided with a fresh air valve 103 and is communicated with the outside, an air supply port 106 which is provided with an air supply machine 105 and is communicated with an air supply pipe 4, a heat recovery air port 107 which is provided with a cold air pipe 3 and communicated with the second exhaust pipe 6, an air inlet 108 which is provided with a fresh air temperature sensor C1 and a fresh air humidity sensor H1 and is communicated with the outside are sequentially arranged on the side wall above the case 101, an external cold and heat meter cooler 109 and an external fan 110 are arranged on the side wall on the right side of the case 101, and a total return air port 111 which is communicated with.
A pipe valve assembly 112 is arranged in the inner cavity of the case 101, a compressor 113 is connected below the pipe valve assembly 112, and a dehumidification surface cooler 114 and an inner cooling and heating surface cooler 115 are connected to the left side of the pipe valve assembly 112; the right side of the pipe valve assembly 112 is connected with the external cold and hot surface cooler 109.
In order to further realize the control of the return air direction and flow in the heat pump unit 1, preferably, a primary return air inlet and a secondary return air inlet are arranged in the main return air inlet 111, a primary return air adjusting plate is arranged in the primary return air inlet, and a secondary return air adjusting plate is arranged in the secondary return air inlet. Specifically, the primary air return inlet directly leads to the inner cavity of the heat pump unit 1, and the secondary air return inlet passes through the dehumidification surface air cooler and then reaches the inner cavity of the heat pump unit 1.
In the specific implementation process, the secondary return air is firstly refrigerated and dehumidified by the dehumidification surface air cooler 114, then is mixed with the circulating return air at the primary return air inlet, and is heated by the internal cold and hot surface air cooler 115, so that the resistance of the secondary return air is greater than that of the primary return air; the proportion of the primary return air quantity and the secondary return air quantity can meet the appropriate requirement through the adjustment of the primary return air adjusting plate and the secondary return air adjusting plate.
During refrigeration and dehumidification, the outlet air of the secondary return air of the dehumidification surface air cooler 114 needs to be lower than the dew point temperature, and the gaseous water in the secondary return air can be condensed to be in a liquid state, so that the secondary return air quantity is carried out according to the requirement that the temperature difference between the inlet air and the outlet air of the dehumidification surface air cooler 114 is large and more condensate water is available. When the moisture content of the fresh air is smaller than that of the return air, the air feeder operates, the fresh air valve is opened, the exhaust fan operates, the fresh air is heated in advance by the total heat exchanger 9 and then is uniformly mixed with the return air when being sucked, and the wet air in the drying room 2 is exhausted through the first exhaust pipe 5, so that the requirement of material drying is met.
When the wet air is exhausted, if the fresh air quantity is too small, the wet air is exhausted too small, and if the wet air is exhausted too small, the material drying time is long; if the fresh air volume is too large, the wet air is discharged too much, and if the wet air is discharged too much, the baking temperature in the drying room 2 can be reduced too much, and the material drying time is long; the adjusting plate can be arranged in the fresh air port and used for adjusting the fresh air volume when the system operates for the first time, and the fresh air volume is adjusted to meet the appropriate requirement by adjusting the size of the air port through the adjusting plate.
So, through the regulation of primary return air volume and secondary return air volume proportion and size, reached the refrigeration capacity optimization matching of the heat transfer volume of dehumidification surface cooler and compressor, solved traditional heat pump drying system and passed through the too big problem of dehumidification surface cooler return air.
In this embodiment, a blower 105 in a heat pump unit 1 is connected to a horizontally arranged blowing chamber 7 through a blowing pipe 4, a horizontal narrow slit blowing port 201 on the right side of the horizontal blowing chamber 7 is communicated with an inner cavity of a drying chamber 2, the inner cavity of the drying chamber 2 is communicated with a horizontal air return chamber 8 through a horizontal narrow slit blowing port 202, the horizontal air return chamber 8 is connected to a first exhaust pipe 5 and a second exhaust pipe 6, the first exhaust pipe 5 exhausts air to the outside, and the second exhaust pipe 6 (the drawing includes two positions, upper and lower) is finally connected to the heat pump unit 1.
In this embodiment, the drying system obtains the flow power of the air by the driving of the blower 105, including the hot air flow output from the heat pump unit 1 to the drying chamber 2 and the return air flow entering the heat pump unit 1 from the drying chamber 2, and further, the moisture in the air can be removed by the heating and cooling of the heat pump unit 1.
The embodiment provides a horizontal air supply structure, hot air enters a horizontal air supply chamber 7 through an air supply pipe 4, the hot air is horizontally supplied into a drying chamber 2 through a horizontal narrow-slit air supply opening 201 on the right side of the horizontal air supply chamber 7 to heat materials, so that moisture in the materials is evaporated and separated out to be mixed with air, then the hot air flows into a horizontal air return chamber 8 through a horizontal narrow-slit air outlet 202, and then the hot air flows into a heat pump unit through a second exhaust pipe 6 to circularly heat and refrigerate the air in the drying chamber 6.
When the system is in operation, relatively dry cold air is mixed with primary return air entering the heat pump unit from the primary return air inlet, and then the air is heated and dried by condensation heat release and partition heat transfer of high-temperature refrigerants in the inner cold and heat surface cooler 115; the secondary return air entering the heat pump unit 1 from the secondary return air inlet is subjected to low-temperature refrigerant evaporation heat absorption and partition wall heat transfer through the dehumidification surface air cooler 114, so that the secondary return air is subjected to refrigeration and dehumidification (condensed water is discharged through the water receiving tray) and then heated by the internal cold and heat surface air cooler 115.
In the air drying and heating process, when the moisture content of the wet air is reduced and the moisture content of the fresh air is greater than a set value, the fresh air valve 103 is opened, the fresh air is preheated by the total heat exchanger 9 and then mixed with the return air to enter the heat pump unit 1, the wet air in the drying chamber 2 is discharged through the first exhaust pipe 5 and the second exhaust pipe 6, and the air in the drying chamber 2 is dried through replacement; the fresh air recovers part of heat in the air with higher temperature and higher humidity to be discharged through the dividing wall of the total heat exchanger 9, thereby achieving the purposes of fresh air preheating and system energy saving.
In the invention, the ventilation valve is arranged between the air feeder and the internal cooling and heating surface air cooler, and the ventilation valve is directly connected with the case: through the operation of the air feeder, the ventilation valve is opened, a large amount of fresh air is sucked through the ventilation valve and enters the air feeder, and wet air in the drying chamber 2, which is equal to the fresh air, is discharged through the first exhaust pipe 5, so that the requirements of higher moisture content at the initial stage of material drying and earlier ventilation, energy conservation and drying are met.
In addition, the side door of the case is opened when the system is shut down for maintenance, flammable dust and oil stains adhered to the cold and hot surface air cooler and the dehumidifying surface air cooler can be thoroughly cleaned by a water gun, and sewage is connected and discharged through a water receiving disc, so that the safety and the reliability of the system are guaranteed. Because the blower of the heat pump unit is arranged above the case, and no other electric appliance exists in the space between the internal cooling surface cooler and the dehumidifying surface cooler, the internal cooling surface cooler and the dehumidifying surface cooler can be cleaned by water.
Overall, the present invention has the following advantages:
firstly, the drying system provided by the invention can control the air return quantity of the dehumidification surface air cooler 114, the air return quantity of the external cold and hot surface air cooler 109 and the internal cold and hot surface air cooler 115, the discharge quantity of the humid air and the heating quantity and the refrigerating quantity of the heat pump unit 1 in time by operating the heat pump unit 1, and can greatly meet the requirements of heat balance and optimal matching.
The drying system provided by the invention solves the problems of uneven air supply and return air and uneven discharge of wet air in the drying chamber 2 of the conventional equipment, can ensure that materials in the drying chamber 2 are basically and synchronously dried, solves the problems of low temperature and poor ventilation of local materials, and does not additionally increase the running time and energy consumption of a heat pump unit due to the drying of the materials.
Thirdly, according to indoor and outdoor temperature and relative humidity parameters which change at any time, the invention provides an intelligent drying system, so that the invention can achieve the combination of ventilation drying, refrigeration drying and wet air exhaust drying, and realizes the maximum dehumidification amount. Meanwhile, different drying modes can be adopted along with the gradual drying of indoor materials and the reduction of the relative humidity of air, so that the intelligent control process is optimized, and the part is explained in detail in embodiment 2.
Example 2:
referring to fig. 5-8, fig. 5-8 provide another embodiment of a drying system of the present invention, wherein fig. 5 is a schematic connection diagram of the pipe valve assembly in the return air heating state disclosed in embodiment 2 of the present invention; fig. 6 is a schematic connection diagram of the pipe valve assembly in the return air heating and dehumidifying state disclosed in embodiment 2 of the present invention; FIG. 7 is a schematic view of the connection of the pipe valve assembly in the high temperature return air refrigeration state disclosed in embodiment 2 of the present invention; FIG. 8 is a schematic view of the connection of the pipe valve assembly in the return air low-temperature refrigeration state disclosed in embodiment 2 of the present invention;
as shown in fig. 5 to 8, the tube valve assembly provided in this embodiment includes a front four-way valve 30, a rear four-way valve 31, an external cooling electromagnetic valve 32, a dehumidification electromagnetic valve 33, a rear cooling electromagnetic valve 34, an expansion valve 35, a first check valve 36, a second check valve 37, a third check valve 38, a fourth check valve 39, and a fifth check valve 40, wherein an exhaust port of the compressor 113 is connected to a port D of the front four-way valve 30, a port E of the front four-way valve 30 is connected to a port D of the rear four-way valve 31, a port C of the front four-way valve 30 is connected to one end of the internal cooling surface cooler 115, a port S of the front four-way valve 30, a port S of the rear four-way valve 31 are connected to a return port of the compressor 113 in parallel, a port E of the rear four-way valve 31 is connected to one end of the dehumidification surface cooler 114, a port C of the rear four-way valve 31, The fourth check valve 39 inlet with the fifth check valve 40 outlet parallel connection, the outer cold and hot surface cooler 109 other end, the second check valve 37 outlet with the third check valve 38 inlet parallel connection, the dehumidification surface cooler 114 other end with the first check valve 36 outlet connection, the first check valve 36 inlet is connected with dehumidification solenoid valve 33 one end, the second check valve 37 inlet with outer cold and hot solenoid valve one end is connected, the third check valve outlet, the fourth check valve outlet with the expansion valve inlet parallel connection, the fifth check valve inlet with back cold solenoid valve one end is connected, the outer cold and hot solenoid valve other end, the dehumidification solenoid valve other end, the back cold solenoid valve other end with the expansion valve outlet parallel connection.
Preferably, the heat pump unit 1 is provided with a ventilation drying mode, a combined drying mode and an air-conditioning refrigeration mode, wherein:
the through-air drying mode comprises the following procedures: firstly, drying by ventilation and secondly, shutting down;
the combined drying mode includes the following steps: ventilation drying, shutdown conversion, return air heating and wet air discharge, return air heating, return air refrigeration and wet air discharge, return air heating and return air refrigeration, and return air heating and return air refrigeration and wet air discharge;
the air-conditioning cooling mode includes the following steps: air cooling, primary cooling, secondary cooling and standby.
In this embodiment, the four different flow circuits are operated in the refrigerant flow by switching on and off the front four-way valve 30 and the rear four-way valve 31, and switching on and off the external cold and hot electromagnetic valves 32, the dehumidification electromagnetic valve 33 and the rear cold and hot electromagnetic valve 34; then the air is processed in four different modes of heating, refrigerating, primary cooling and post cooling by electrifying the compressor 113 and the air feeder 105 for operation and system return air, and then the air is sent out, namely the quadruple heat pump unit. Meanwhile, due to the guarantee of the connection structure of the refrigerating elements, when the heat pump unit operates different refrigerant flows, the surface coolers in the three surface coolers which do not flow and do not participate in heat exchange are always at the low-pressure end, namely the refrigerants in the surface coolers are always at the gaseous end, so that the stable flowing of the refrigerants is guaranteed, and liquid loading and pressure fluctuation cannot be generated.
In specific implementation, the external controller automatically outputs different on-off running signals to various loads in the drying system, such as the air feeder 105, the external air blower 110, the front four-way valve 30, the rear four-way valve 31, the external cooling electromagnetic valve 32, the dehumidification electromagnetic valve 33, the rear cooling electromagnetic valve 34, the fresh air valve 103, the ventilation valve 102, the compressor 113 and the like according to the specified program according to the changes of various parameters, such as fresh air temperature, fresh air relative humidity, return air temperature, return air relative humidity, fresh air moisture content, return air moisture content and the like, so as to obtain different load combination control.
In the embodiment, three working modes of a ventilation drying mode, a combined drying mode and an air-conditioning refrigeration mode can be obtained by controlling the load combinations with different on-off of each load, wherein the ventilation drying mode is provided with a running procedure of two different load combinations of ventilation drying and shutdown, the combined drying mode is provided with a running procedure of ventilation drying, shutdown conversion, return air heating and wet air discharge, return air heating, return air refrigeration and wet air discharge, return air heating, return air refrigeration and shutdown, and the air-conditioning refrigeration mode is provided with a running procedure of four different load combinations of air cooling, primary cooling, secondary cooling and standby.
Specifically, when the fresh air temperature is lower than a set value (such as-9 ℃) or higher than a set value (such as 45 ℃), in order to prevent the compressor 113 from running at an excessive temperature, the heat pump unit 1 automatically gives an alarm in a standby state, and the heat pump unit 1 automatically stops and gives an alarm in a running state. When the temperature of the fresh air is in a set range (such as-8-44 ℃), the heat pump unit 1 keeps a standby state or an operating state, and the controller has three working modes of ventilation drying, combined drying and air-conditioning refrigeration.
The three operation modes are specifically described below.
One, through air drying mode
Procedure I, air drying
When the moisture content of the return air and the moisture content of the fresh air are larger than or equal to a set value (such as 12g/kg), the blower in the load combination is electrified to operate, and the ventilation valve is electrified to be opened. A large amount of relatively dry air outside the room is sucked in through the ventilation valve, and an equal amount of wet air in the drying room 2 is discharged from the first exhaust duct 5 of the wet air passage.
Step two, shutdown
When the moisture content of the return air and the moisture content of the fresh air are less than or equal to a set value (such as 10g/kg), the controller is shut down: and the blower in the load combination is powered off and stopped, the ventilation valve is powered on and closed, and the completion of the operation is displayed.
The heat pump unit does not participate in operation, has low system operation power, and is suitable for drying materials with dry fresh air, low drying requirement and longer drying time.
Two, combined drying mode
Procedure I, air drying
When the return air moisture content-fresh air moisture content is larger than or equal to a set value (such as 20g/kg), the blower in the load combination is powered on to operate, the ventilation valve is powered on to be opened, a large amount of outdoor relatively dry air is sucked from the ventilation valve, and the same amount of wet air in the drying chamber 2 is discharged from the first exhaust pipe 5. The process is suitable for the initial drying of the material with water or high water content on the surface before drying.
Step two, halt conversion
When the return air moisture content-fresh air moisture content is less than or equal to a set value (such as 18g/kg), the blower is powered off and shut down and the ventilation valve is powered on and shut down in the load combination, and the controller is automatically shut down and converted into the next process.
Step three, return air heating and wet air discharging
When the relative humidity of the return air is larger than or equal to a set value (such as 21%), the temperature of the return air is smaller than or equal to a set value (such as 50 ℃), and the moisture content of the return air and the moisture content of the fresh air are larger than or equal to a set value (such as 26g/kg), the air feeder in the load combination is electrified to operate, the outer fan is electrified to operate, the compressor is electrified to operate, the rear four-way valve is electrified to be switched, the outer cold-hot electromagnetic valve is. Air in the drying chamber 2 circulates through an inner cold-hot surface cooler of the heat pump unit and is heated, fresh air is sucked in after being preheated by the total heat exchanger 9, and wet air is discharged from the first exhaust duct 5. When the system is in operation, as the humid air in the drying chamber 2 is discharged and the moisture content of the air is reduced, the heat loss of the discharged humid air and the heat loss of heat preservation are removed, the heat generated by the operation of the compressor is more than the heat absorbed by the evaporation and precipitation of the moisture in the material, and the temperature of the air in the drying chamber 2 is gradually increased; the cold energy generated by the operation of the compressor exchanges heat with the outdoor air through the operation of the external cold and hot surface air cooler and the external fan, namely, the process that the refrigerant absorbs the heat in the outdoor air and transfers the heat to the air in the drying chamber 2 is realized. The refrigerant flow of the heat pump unit in the process is return air heating.
Step four, return air heating
When the relative humidity of the return air is more than or equal to a set value (such as 21 percent), the temperature of the return air is less than or equal to a set value (such as 50 ℃ C.), and the moisture content of the return air and the moisture content of the fresh air are less than or equal to a set value (such as 24g/kg), the air feeder in the load combination is electrified to operate, the outer fan is electrified to operate, the compressor is electrified to operate, the rear four-way valve is electrified to be switched, and. The air in the drying chamber 2 circulates through an inner cold and hot surface cooler of the heat pump unit and is heated, the heat loss of heat preservation is removed, the heat generated by the operation of the compressor is larger than the heat absorbed by the evaporation and separation of water in the materials, and the air in the drying chamber 2 is heated and gradually heated. At the moment, the difference between the moisture content of the return air and the moisture content of the fresh air is not large, and no wet air is discharged, so that the negative effect of temperature reduction in the drying chamber 2 caused by the wet air outside is avoided, the temperature of the material in the drying chamber can be increased as much as possible, and the kinetic energy of moisture evaporation and escape in the material is increased. The refrigerant flow of the heat pump unit in the process is return air heating.
Step five, return air heating, return air refrigeration and wet air discharge
When the relative humidity of the return air is more than or equal to a set value (such as 21 percent), the set value (such as 51 ℃) is less than or equal to a set value (such as 59 ℃), and the moisture content of the return air and the moisture content of the fresh air are more than or equal to the set value (such as 23g/kg), the air feeder in the load combination is powered on to operate, the compressor is powered on to operate, the dehumidification electromagnetic valve is powered on to open, and the fresh air valve is powered on to open. The secondary return air passing through the dehumidifying surface air cooler is circularly refrigerated and dehumidified, namely, the water vapor in the humid air meets the colder surface to release heat to be condensed water and is discharged through a water receiving disc, and the secondary return air passing through the dehumidifying surface air cooler is mixed with the primary return air and then is circularly heated through an inner cold surface air cooler; fresh air is heated by the total heat exchanger 9 and then sucked, and wet air is discharged from the first exhaust pipe 5. The heat loss of the discharged wet air and the heat loss of the heat preservation are removed, the refrigerating capacity of the heat pump is balanced with the heat absorption capacity of the secondary return air, the heating capacity of the secondary return air after refrigeration and the heating capacity of the fresh air are balanced, the heat absorption capacity of the heat pump is balanced with the heat absorption capacity of the materials after evaporation and separation of moisture, the heat absorption capacity of the materials after evaporation and separation of moisture is gradually reduced along with the reduction of the moisture in the materials, and the temperature of the return air sent into the drying chamber 2 is also gradually. The refrigerant flow of the heat pump unit in the process comprises return air heating and return air refrigeration.
Sixth, return air heating and return air refrigerating
When the relative humidity of the return air is more than or equal to a set value (such as 21 percent), the set value (such as 51 ℃) is less than or equal to a set value (such as 59 ℃), and the moisture content of the return air-the moisture content of the fresh air is less than or equal to the set value (such as 21g/kg), the blower in the load combination is powered on to operate, the compressor is powered on to operate, and the dehumidification electromagnetic valve is powered on to open. The secondary return air through the dehumidification surface air cooler is dehumidified by circulating refrigeration, namely, the water vapor in the humid air meets the cold surface heat release and is discharged as condensed water and through a water receiving disc, and the secondary return air and the primary return air through the dehumidification surface air cooler are mixed and then are heated in a circulating mode through the internal cooling surface air cooler. The refrigerant flow of the heat pump unit in the process comprises return air heating and return air refrigeration.
Step seven, return air heating, return air refrigeration and wet air discharge
When the relative humidity of the return air is larger than or equal to a set value (such as 21%), the temperature of the return air is larger than or equal to a set value (such as 60 ℃), and the moisture content of the return air and the moisture content of the fresh air are larger than or equal to a set value (such as 20g/kg), the air feeder in the load combination is electrified to operate, the compressor is electrified to operate, the dehumidification electromagnetic valve is electrified to open, and the fresh air valve is electrified to. The refrigerant flow of the heat pump unit in the process comprises return air heating and return air refrigeration.
Step eight, return air heating and return air refrigeration
When the relative humidity of the return air is larger than or equal to a set value (such as 21 percent), the temperature of the return air is larger than or equal to a set value (such as 60 ℃ C.), and the moisture content of the return air and the moisture content of the fresh air are smaller than or equal to a set value (such as 18g/kg), the air feeder in the load combination is electrified to operate, the compressor is electrified to operate, and the dehumidification electromagnetic valve is electrified to be opened. The refrigerant flow of the heat pump unit in the process comprises return air heating and return air refrigeration.
Step nine, shutdown
When the relative humidity of the return air is less than or equal to a set value (such as 20 percent) and the retention time is more than or equal to the set value (such as 20min), the system performs the working procedures of return air heating, return air refrigeration and wet air discharge, sixthly return air heating, return air refrigeration and wet air discharge and eighthly return air heating and return air refrigeration, the controller is shut down and displays that the operation is finished.
Description of combined drying mode operation:
1. the controller automatically selects one of seven processes of ventilation drying, return air heating, return air refrigerating and wet air discharging, sixthly return air heating, return air refrigerating and wet air discharging, and eighthly return air heating and return air refrigerating according to the detected fresh air temperature, fresh air relative humidity, return air temperature and return air relative humidity and the calculated fresh air moisture content and return air moisture content and the control conditions to start to operate. If none of the seven process run conditions are met, the controller is not running and indicates that the material does not need to be dried.
2. The system is operated according to the procedure of the above combined drying mode, the controller achieves the maximum dehumidification principle when the ventilation drying, the wet air discharging and the return air refrigeration are combined and applied, and adopts different drying modes and intelligent and optimal control requirements along with the gradual drying of indoor materials and the reduction of the relative humidity of air: namely, the moisture content of the material is higher, and the material is firstly subjected to ventilation drying in the early stage of drying; if the moisture content of the material is not high, the middle and later stages are that return air heating, wet air discharging, return air refrigerating, return air heating and return air refrigerating are respectively carried out, so that the material is quickly dehumidified, the heat is fully utilized, and the dryness of the material is high.
3. The system operates the fresh air suction and the wet air discharge according to the optimization mechanism that the difference between the return air moisture content and the fresh air moisture content is larger when the return air temperature is low, and the difference between the return air moisture content and the fresh air moisture content is smaller when the return air temperature is high; when the materials are dried, the return air temperature rises fast, the relative humidity of the return air is not too high, and the materials are dried fast and have small deformation.
4. The problems that in the traditional control, in the process of starting heating of the return air, the operation of discharging the wet air is not or difficultly set accurately, and the wet air cannot be discharged in time to cause the moisture content of the return air to be too large, so that the temperature of the return air rises slowly are solved; the reason for this is that the specific heat of water vapor is much greater than that of dry air, and the heat required for the temperature rise of humid air with much moisture is much greater than that of humid air with little moisture.
5. The air moisture content is a function of the temperature and the relative humidity, the controller calculates according to a corresponding formula, and then the difference value of the return air moisture content and the fresh air moisture content is obtained. Because the air moisture content is a parameter which accurately reflects the moisture content in unit air, the system uses the difference value of the return air moisture content and the fresh air moisture content to carry out dehumidification control, and the method is an optimized and accurate control mode.
Third, air conditioner refrigeration mode
The mode is used for rapidly cooling the drying chamber 2 and the materials after the operation of the combined drying mode is finished, so that the temperature in the drying chamber 2 is comfortable, the materials can be rapidly circulated, and the work efficiency can be improved. The air-conditioning refrigeration mode is selected to operate or not according to needs.
Step one, air cooling
When the return air temperature is larger than or equal to a set value (such as 50 ℃), the blower is electrified to operate and the vent valve is electrified to be opened in the load combination. A large amount of fresh air with relatively low temperature is sucked into the blast pipe from the ventilation valve, and hot air in the drying chamber 2 is exhausted through the first exhaust pipe 5.
This process utilizes the hot air mix in relative low temperature new trend and drying chamber 2, reaches energy-conserving cooling's effect to avoided the problem that heat pump compressor structure is unsuitable for the high temperature air cooling for the drying, also utilized simultaneously when new trend mixes with the interior high temperature air of drying chamber 2, because of the moisture of new trend can be discharged along with the air mixture, do not influence the mechanism of 2 material dryness degrees in drying chamber.
Step two, initial cooling
When the return air temperature is less than or equal to a set value (such as 49 ℃), the blower in the load combination is electrified to operate, the outer blower is electrified to operate, the compressor is electrified to operate, the front four-way valve is electrified to be switched, and the dehumidification electromagnetic valve is electrified to be opened. The secondary return air passing through the dehumidification surface air cooler is circularly refrigerated, and the heat generated by the operation of the compressor is circularly exchanged with the outdoor air through the operation of the external cold and hot surface air cooler and the external fan. The refrigerant flow of the heat pump unit in the process is return air primary cooling.
The process utilizes the refrigeration effect of small air quantity and large temperature difference of the dehumidification surface air cooler to reduce the evaporation temperature of a refrigerant, so that the evaporation temperature and the condensation temperature of a heat pump are moderate, the compression ratio of the compressor is enabled to operate in a better range, and the compressor is enabled to be suitable for refrigeration and cooling of air with higher temperature in the drying chamber 2.
Step three, after cooling
When the return air temperature is less than or equal to a set value (such as 35 ℃), the air feeder in the load combination is electrified to operate, the outer air blower is electrified to operate, the compressor is electrified to operate, the front four-way valve is electrified to be switched, and the rear cooling electromagnetic valve is electrified to be opened. The return air passing through the inner cold and hot surface cooler is circularly refrigerated, and the heat generated by the operation of the compressor is circularly exchanged with the outdoor air through the operation of the outer cold and hot surface cooler and the outer fan. The refrigerant flow of the heat pump unit in the process is cooling after air return.
The working procedure utilizes the refrigeration effect of large air quantity and small temperature difference of the inner cold and hot surface cooler to improve the evaporation temperature of the refrigerant, so that the evaporation temperature and the condensation temperature of the heat pump are moderate, the compressor achieves the effect of refrigerating at lower temperature, and the requirement of low-temperature turnover after partial materials are dried is met.
Step four, standby
When the return air temperature is less than or equal to a set value (such as 15 ℃), the controller is in standby, and the rest loads are powered off except the air feeder which is kept powered on to operate; when the return air temperature is more than or equal to a set value (such as 16 ℃), the system automatically operates the third process.
In conclusion, the invention has the characteristics of rapidness, high efficiency, energy conservation, intelligent control, optimized operation, safety, reliability, low cost, simple operation, convenient maintenance and low operation cost.
Example 3:
referring to fig. 9, fig. 9 provides a further embodiment of the present invention, wherein fig. 9 is a schematic structural diagram of the overall drying system disclosed in embodiment 3 of the present invention.
In this embodiment, the air supply outlets 201 are uniformly distributed on the upper side wall of the drying chamber 2 from left to right, and the air outlets 202 are uniformly distributed on the lower side wall of the drying chamber 2 from left to right.
In this embodiment, the blower 105 is connected to a vertically arranged blowing chamber (adjusted to a vertical blowing chamber from the horizontally arranged blowing chamber of embodiment 1) through a blowing pipe 4, a vertical blowing port 201 of the vertically arranged blowing chamber is communicated with the drying chamber 2, an air outlet 202 is communicated with the drying chamber 2, and finally, the blower can be connected to a total return air inlet of the heat pump unit through a second exhaust pipe 6.
In the specific implementation process, through the supply-air outlet 201 of vertical arrangement, hot-air from last down sends to the drying chamber 2 in perpendicularly and makes the material heating, makes moisture content evaporation in the material separate out and air mixing, then gets into the return air intermediate layer (the circulation of realization air that the return air intermediate layer can be better) that the drying chamber 2 bottom was left and is established through air outlet 202, gets back to heat pump set 1 through second exhaust pipe 6, makes the air in the drying chamber 2 obtain circulation heating and refrigeration.
The drying system provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (6)

1. A drying system is characterized by comprising a heat pump unit and a drying chamber, wherein a cold air pipe for guiding cold air in and an air supply pipe for guiding hot air out are arranged on the heat pump unit, an air supply outlet is fully distributed on the side wall of one side of the drying chamber, an air outlet is fully distributed on the side wall of the other side of the drying chamber, the air supply pipe is communicated with the air supply outlet, a first exhaust pipe and a second exhaust pipe are communicated with the air outlet, the first exhaust pipe is communicated with the outside, and the second exhaust pipe is communicated with the heat pump unit;
the widths of the air supply outlet and the air outlet are increased from top to bottom;
the heat pump unit comprises a case with an internal ventilation valve, wherein a fresh air port with a fresh air valve and communicated with the outside, an air supply port with an air supply machine and communicated with the air supply pipe, a heat recovery air port communicated with the cold air pipe and the second exhaust pipe, and an air inlet provided with a fresh air temperature sensor and a fresh air humidity sensor and communicated with the outside are sequentially arranged on the side wall above the case from left to right; a pipe valve assembly is arranged in the inner cavity of the case, a compressor is connected below the pipe valve assembly, and a dehumidification surface air cooler and an inner cooling and heating surface air cooler are connected to the left side of the pipe valve assembly; the right side of the pipe valve assembly is connected with the external cold and hot surface cooler;
the pipe valve assembly comprises a front four-way valve, a rear four-way valve, an external cooling electromagnetic valve, a dehumidification electromagnetic valve, a rear cooling electromagnetic valve, an expansion valve, a first one-way valve, a second one-way valve, a third one-way valve, a fourth one-way valve and a fifth one-way valve, wherein the exhaust port of the compressor is connected with a port D of the front four-way valve, a port E of the front four-way valve is connected with a port D of the rear four-way valve, a port C of the front four-way valve is connected with one end of the internal cooling surface cooler, a port S of the front four-way valve and a port S of the rear four-way valve are connected with the return port of the compressor in parallel, a port E of the rear four-way valve is connected with one end of the dehumidification surface cooler, a port C of the rear four-way valve is connected with one end of the external cooling surface cooler, the other, The second check valve export with third check valve entry parallel connection, the dehumidification surface cooler other end with first check valve exit linkage, first check valve entry is connected with dehumidification solenoid valve one end, the second check valve entry with outer cold heat electromagnetic valve one end is connected, the third check valve export the fourth check valve export with expansion valve entry parallel connection, the fifth check valve entry with back cold solenoid valve one end is connected, outer cold heat electromagnetic valve other end the dehumidification solenoid valve other end back cold solenoid valve other end with expansion valve exit parallel connection.
2. The drying system according to claim 1, wherein the air supply outlets are uniformly distributed from top to bottom on a left side wall of the drying chamber, and the air outlet outlets are uniformly distributed from top to bottom on a right side wall of the drying chamber.
3. The drying system according to claim 2, wherein a blowing chamber is provided between the blowing duct and the blowing port, and a return chamber is provided between the blowing port and both the first exhaust duct and the second exhaust duct.
4. The drying system according to claim 1, wherein the air supply outlets are uniformly distributed from left to right on an upper side wall of the drying chamber, and the air outlet outlets are uniformly distributed from left to right on a lower side wall of the drying chamber.
5. The drying system of claim 1, wherein the cold air duct penetrates through the first exhaust duct, and a total heat exchanger is wrapped on the cold air duct and used for transferring heat in the first exhaust duct to the inner cavity of the cold air duct.
6. The drying system of claim 1, wherein a primary air return opening and a secondary air return opening are provided in said primary air return opening, a primary air return damper is provided in said primary air return opening, and a secondary air return damper is provided in said secondary air return opening.
CN201810354165.7A 2018-04-19 2018-04-19 Drying system Active CN108534477B (en)

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