CN110779322B - Control method of drying system and drying system - Google Patents

Control method of drying system and drying system Download PDF

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Publication number
CN110779322B
CN110779322B CN201911043616.6A CN201911043616A CN110779322B CN 110779322 B CN110779322 B CN 110779322B CN 201911043616 A CN201911043616 A CN 201911043616A CN 110779322 B CN110779322 B CN 110779322B
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electric heating
target
practice
drying
heat pump
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CN110779322A (en
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王晓红
谷月明
何建发
郑神安
张鸿宙
陆飞荣
黄雨晴
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/10—Temperature; Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/04—Heating arrangements using electric heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The application relates to a control method of a drying system and the drying system, and belongs to the technical field of drying control. This application drying system includes: the heat pump, the auxiliary electric heating module and the dehumidifying fan are controlled by the method comprising the following steps: determining an entering drying control stage; acquiring an environmental parameter of a drying space corresponding to a drying control stage; and performing linkage control on the control object in the drying control stage according to the environmental parameters and the change gradient thereof. Through this application, help promoting the stability of stoving space environmental parameter change, and then help promoting the stoving quality of product.

Description

Control method of drying system and drying system
Technical Field
The application belongs to the technical field of drying control, and particularly relates to a control method of a drying system and the drying system.
Background
The heat pump operation and the auxiliary electric heating operation control of the traditional dehumidifying heat pump dryer are mainly embodied in the following two aspects:
firstly, a drying room heat pump heating temperature rise control stage: the operation of the heat pump and the auxiliary electric heating are synchronously started, and the heat pump and the auxiliary electric heating are synchronously closed after the drying machine is stopped at a temperature point, so that the heating rate of the drying room is increased to the maximum extent, wherein 5-10 groups of auxiliary electric heating devices are generally standardized by the drying machine, and a control mode of synchronous operation or synchronous cutting is adopted.
The control disadvantages are as follows:
1. this kind of control mode promotes the rate of rise of temperature in stoving room to the greatest extent, but the rate of rise of temperature in stoving room can't be controlled, leads to the technology intensification stoving curve that can't satisfy the stoving crop easily (if the rate of rise of temperature too fast leads to stoving crop burnt yellow to produce the ash hanging because of the rapid-heating is dry), reduces the stoving quality.
2. In the control mode, 5-10 groups of auxiliary electric heating are matched in a standard mode for controlling the on and off of the drying room simultaneously (for example, each group of auxiliary electric heating is 2kW, and the heat load of the drying room is fluctuated by nearly 10-20 kW when the auxiliary electric heating is started and stopped), so that the temperature of the drying room at the cut-in and cut-out points of the auxiliary electric heating is extremely fluctuated, the nonuniformity of a temperature field in the drying room is increased, the process precision of the temperature control of the drying room is influenced, and even the drying quality.
Secondly, a temperature maintaining and humidity discharging control stage of a heat pump of the drying room: in the humidity of the humidity-discharging type heat pump operation fixed-frequency unit temperature drying room, the humidity-discharging requirement of high humidity of the drying room is met, the humidity-discharging centrifugal fan is directly opened, and the stable control of the humidity of the drying room is realized through humidity-discharging heat dissipation.
The control disadvantages are as follows:
centrifugal fan moisture capacity is big, and simple periodic timing is on-off control, and it is big that no sensible heat recovery unit leads to the stoving room heat to scatter and disappear, and the heat pump heating capacity full load operation still can not satisfy the dehumidification demand, can't compromise stoving room temperature and humidity temperature demand. Too big moisture removal capacity leads to the stoving room temperature fluctuation violent, influences the moisture evaporation of stoving crop, and the moisture removal capacity is not enough leads to the stoving room humidity too high, easily causes the corruption of stoving crop high temperature and high humidity.
To summarize: the operation of a heat pump in a traditional dehumidifying heat pump dryer and the simultaneous start and stop or timing start and stop control of auxiliary electric heating are adopted, the auxiliary electric heating adopts synchronous input operation or synchronous output control and the periodic timing start and stop control of a centrifugal fan, and the control mode causes the defect of severe fluctuation in the environmental parameter control of a drying room and has adverse effect on the drying quality of products.
Disclosure of Invention
In order to overcome the problems in the related art at least to a certain extent, the application provides a control method of a drying system and the drying system, which are beneficial to improving the stability of the change of the environmental parameters of the drying space and further beneficial to improving the drying quality of products.
In order to achieve the purpose, the following technical scheme is adopted in the application:
in a first aspect,
the application provides a control method of a drying system, the drying system comprises: the heat pump, the auxiliary electric heating module and the dehumidifying fan, wherein the method comprises the following steps:
determining an entering drying control stage;
acquiring the environmental parameters of the drying space corresponding to the drying control stage;
and performing linkage control on the control object in the drying control stage according to the environmental parameters and the change gradient thereof.
Further, the linkage control of the control object in the drying control stage according to the environmental parameter and the variation gradient thereof includes:
if the drying control stage is a temperature rise control stage, starting the heat pump to operate, and judging whether the actual temperature and the temperature rise rate of the drying space meet the following conditions: t isPractice of≤TTarget- Δ T' and ψPractice of≤ψTarget；
If yes, then every time the actual temperature is detected within a first preset detection period, the following conditions are met: t isPractice of≤TTarget- Δ T', activating a group of electric heating units of said auxiliary electric heating module in the order of numbering;
wherein, TPractice ofIs the actual temperature of the drying space, TTargetFor a set target temperature, Δ T' is a set temperature deviation constant, ψPractice ofFor the actual rate of temperature rise, #TargetIs the set target heating rate.
Further, the linkage control of the control object in the drying control stage according to the environmental parameter and the variation gradient thereof further comprises:
after each group of electric heating units is started, whether the actual temperature meets the requirements in the first preset detection period or not is judged by running for a first preset interval time: t isPractice of≤TTarget-ΔT′。
Further, the linkage control of the control object in the drying control stage according to the environmental parameter and the variation gradient thereof further comprises:
if after starting an electric heating unit at a certain time, when the actual temperature is detected to satisfy: t isTarget-ΔT′＜TPractice of＜TTarget-ΔTiThe auxiliary heating operation is maintained by the activated electric heating unit, wherein Δ TiSetting a temperature deviation constant, wherein i is 1, 2, …, n is the number of groups of the auxiliary electric heating modules in which the electric heating units are started; alternatively, the first and second electrodes may be,
if after starting an electric heating unit a certain time, every time the actual temperature is detected in a second preset detection period, the following conditions are met: t isPractice of≥TTarget-ΔTiWhen the starting sequence is the reverse sequence, closing one group of the started electric heating units; alternatively, the first and second electrodes may be,
if after starting an electric heating unit at a certain time, the actual temperature detected in a third preset detection period meets the following conditions: t isPractice of≥TTarget+ Δ T ", where Δ T" is the set temperature deviation constant, all activated electrical heating units are turned off.
Further, the linkage control of the control object in the drying control stage according to the environmental parameter and the variation gradient thereof includes:
if the drying control stage is a temperature maintaining and humidity discharging control stage, whether the actual humidity of the drying space meets FY is judgedPractice of＞FYTarget+ Δ fy, and when satisfied, control the dehumidifying fan to start at an initial gear, and then whenever it is detected that the actual humidity and the dehumidification rate are both satisfied within a fourth preset detection period: FYPractice of＞FYTarget+ Δ fy and ζPractice of≤ζTargetWhen the temperature is higher than the set temperature, the humidity exhaust fan is turned to be higher by one gear; and
in the operation process of the dehumidifying fan, whether the cooling rate of the drying space meets the following requirements is judged: phi is aPractice of＞φTargetAnd when satisfied, determining the heat pump state, including: closed or open;
controlling the heat pump and the auxiliary electric heating module according to the state of the heat pump, the actual temperature and the change rate of the actual temperature;
wherein, FYPractice ofFor actual humidity of the drying space, FYTargetSet target humidity, Δ fy is set humidity deviation constant, ζPractice ofFor practical dehumidification rates, ζTargetSet target dehumidification rate, phiPractice ofIs the cooling rate of the drying space, phiTargetAnd setting a target cooling rate.
Further, the linkage control of the control object in the drying control stage according to the environmental parameter and the variation gradient thereof further comprises:
if after a certain gear is adjusted, the actual humidity and the dehumidification rate are both satisfied within a fifth preset detection period: FYPractice of＞FYTarget+ Δ fy and ζPractice of＞ζTargetControlling the moisture exhausting fan to keep running at the current gear; alternatively, the first and second electrodes may be,
if after a certain gear is adjusted, the actual humidity detected in the sixth preset detection period meets the following conditions: FYPractice of≤FYTargetAnd closing the moisture exhaust fan.
Further, the linkage control of the control object in the drying control stage according to the environmental parameter and the variation gradient thereof further comprises:
after the gear is adjusted once, judging whether the actual humidity and the dehumidification rate meet the requirements in the fourth preset detection period or not by operating a second preset interval time: FYPractice of＞FYTarget+ Δ fy and ζPractice of≤ζTarget。
Further, the controlling the heat pump and the auxiliary electric heating module according to the heat pump state, the actual temperature and the change rate thereof includes:
if the heat pump is in a closed state, determining whether to start the operation of the heat pump according to a preset starting judgment condition of the heat pump; and
starting a first of the auxiliary electrical heating modules according to a numbering sequenceThe group electric heating unit detects that the cooling rate is satisfied every time in a seventh preset detection period: phi is aPractice of＞φTargetThen, a set of electric heating units is sequentially activated.
Further, the controlling the heat pump and the auxiliary electric heating module according to the heat pump state, the actual temperature and the change rate thereof includes:
if the heat pump is in an on state, the cooling rate is satisfied every time when the eighth preset detection period is detected: phi is aPractice of＞φTargetThen, a group of electric heating units is started according to the numbering sequence.
Further, the controlling the heat pump and the auxiliary electric heating module according to the heat pump state, the actual temperature and the change rate thereof further comprises:
if after starting an electrical heating unit a certain time, whenever detecting that the cooling rate satisfies in a ninth preset detection period: phi is aPractice ofAnd when the starting sequence is less than or equal to 0, closing one group of the started electric heating units according to the reverse sequence of the starting sequence.
Further, the controlling the heat pump and the auxiliary electric heating module according to the heat pump state, the actual temperature and the change rate thereof further comprises:
after all the started electric heating units are closed, when the electric heating units in the auxiliary electric heating module are started again, the electric heating units in the auxiliary electric heating module are started according to the reverse order of the last starting order.
In a second aspect of the present invention,
the application provides a drying system, includes:
a memory having an executable program stored thereon;
a processor for executing the executable program in the memory to implement the steps of any of the above methods.
This application adopts above technical scheme, possesses following beneficial effect at least:
this application is according to the stoving control stage that gets into, obtains the environmental parameter that this stage corresponds, according to environmental parameter and the gradient that changes thereof, comes to carry out coordinated control to the control object in this stage, helps promoting the stability of stoving space environmental parameter change, makes the change of stoving space environmental parameter match the stoving technology curve, and then helps promoting the stoving quality of product.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the embodiments of the present application 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 some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart illustrating a control method of a drying system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a drying system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic flowchart of a control method of a drying system according to an embodiment of the present application, where the control method applies the drying system including: the control method comprises the following steps of:
and step S101, determining an entering drying control stage.
Specifically, in the heat pump drying system with the auxiliary electric heating module and the dehumidifying fan, the drying control stage can comprise a temperature rise control stage and a temperature maintenance dehumidifying control stage, and in specific application, when the material is dried, the material firstly enters the temperature rise control stage and then enters the temperature maintenance dehumidifying control stage.
And step S102, obtaining the environment parameters of the drying space corresponding to the drying control stage.
Specifically, when the material is dried and enters a temperature rise control stage, the corresponding environmental parameter of the drying space is the temperature, and at this stage, the temperature of the drying space needs to be raised to a set target temperature. When entering the temperature maintaining and humidity discharging control stage, the corresponding environmental parameters of the drying space are temperature and humidity, and the temperature of the drying space needs to be maintained and controlled, and the drying space needs to be dehumidified.
And S103, performing linkage control on the control object in the drying control stage according to the environmental parameters and the change gradient thereof.
Specifically, according to the environmental parameters and the variation gradient thereof, for example, in the temperature rise control stage, the heat pump and the auxiliary electric heating module are subjected to linkage control according to the temperature and the temperature variation gradient, and for example, in the temperature maintenance and humidity exhaust control stage, the heat pump, the auxiliary electric heating module and the humidity exhaust fan are subjected to linkage control according to the temperature, the humidity and the respective variation gradient thereof, so that the fine regulation and control of the environmental parameters of the drying space can be realized, the stability of the variation of the environmental parameters of the drying space can be improved, the variation of the environmental parameters of the drying space can be matched with the drying process curve, various problems existing in the related technology as pointed out in the background technology of the application can be overcome, and the drying quality of the product can be improved.
Several embodiments are described below with respect to step S103.
In one embodiment, the performing linkage control on the control object in the drying control stage according to the environmental parameter and the variation gradient thereof includes:
if the drying control stage is enteredAnd in the temperature rise control stage, starting the heat pump to operate, and judging whether the actual temperature and the temperature rise rate of the drying space meet the following conditions: t isPractice of≤TTarget- Δ T' and ψPractice of≤ψTarget；
If yes, then every time the actual temperature is detected within a first preset detection period, the following conditions are met: t isPractice of≤TTarget- Δ T', activating a group of electric heating units of said auxiliary electric heating module in the order of numbering;
wherein, TPractice ofIs the actual temperature of the drying space, TTargetFor a set target temperature, Δ T' is a set temperature deviation constant, ψPractice ofFor the actual rate of temperature rise, #TargetIs the set target heating rate.
Specifically, this embodiment is an application example of the temperature increase control stage. In practical application, for example, 5 ~ 10 electric heating units of auxiliary electric heating module configuration, every group auxiliary electric heating is 2kW, if carry out the control of opening simultaneously, the nearly 10 ~ 20 kW's of drying room heat load fluctuation in auxiliary electric heating opens and stops, makes drying room rate of rise too fast, also very easily causes auxiliary electric heating to cut in point drying room temperature and violently fluctuates, increases the inhomogeneity in the inside temperature field of drying room, influences the technology precision of drying room temperature control, reduces the stoving quality even. The problem can be effectively solved through the scheme of the embodiment. In a specific application of the above embodiment, the machine set may perform logical memory numbering on each electric heating unit of the auxiliary electric heating modules, for example, if there are five groups of electric heating units of the auxiliary electric heating modules, the five groups of electric heating units may be numbered 1, 2, 3, 4, and 5. According to the actual temperature and the heating rate thereof, through the above judgment conditions, the gradient input control is performed on each electric heating unit of the auxiliary electric heating module, the stability of heating change is favorably ensured, the heating change of the drying space is matched with a heating and drying process curve, and the drying quality of the product is favorably improved.
Further, the linkage control of the control object in the drying control stage according to the environmental parameter and the variation gradient thereof further comprises:
after each group of electric heating units is started, whether the actual temperature meets the requirements in the first preset detection period or not is judged by running for a first preset interval time: t isPractice of≤TTarget-ΔT′。
Specifically, the first preset interval duration may be set to 30 minutes, for example, after the first group of electric heating units are put into operation, the first group of electric heating units operate for 30 minutes, and then the actual temperatures are detected and determined whether all the actual temperatures meet within a first preset detection period: t isPractice of≤TTargetIf the difference is satisfied, the electric heating units are further put into a second group, and the other groups of electric heating units are analogized in sequence. Through two first preset detection periods, the first preset interval duration constraint is formed, so that the temperature rise speed can be stabilized, the temperature rise speed cannot be too fast, and the temperature field of the drying space can be uniformly changed.
Further, the linkage control of the control object in the drying control stage according to the environmental parameter and the variation gradient thereof further comprises:
if after starting an electric heating unit at a certain time, when the actual temperature is detected to satisfy: t isTarget-ΔT′＜TPractice of＜TTarget-ΔTiThe auxiliary heating operation is maintained by the activated electric heating unit, wherein Δ TiAnd i is 1, 2, …, n is the number of groups of the auxiliary electric heating modules in which the electric heating units are started.
Specifically, in this embodiment, after the group of electric heating units is turned on, the auxiliary electric heating module is controlled to perform heating while remaining in this state. According to Δ TiIt can be seen that after each group of electric heating units is turned on, it corresponds to a Δ TiSo that its corresponding TTarget-ΔT′＜TPractice of＜TTarget-ΔTiIn contrast, in a particular application, the difference can be determined by comparing the respective specific Δ TiThe specific setting is carried out to ensure that the temperature control is better matched with the temperature rise drying curve of the process.
Or, e.g., asIf after starting an electric heating unit at a certain time, whenever the actual temperature is detected within a second preset detection period, the actual temperature satisfies: t isPractice of≥TTarget-ΔTiWhen the starting sequence is the reverse sequence, closing one group of the started electric heating units;
specifically, in this embodiment, after the group of electric heating units is turned on, the turned-on electric heating units are determined and controlled to exit in the reverse order, in a specific application, after the group of electric heating units is turned on, the temperature rise rate of the drying space is increased, and as to whether the increase amplitude of the temperature increase gradient meets the requirement or not, the temperature increase gradient is increased according to Δ T in the present applicationiIt can be seen that after each group of electric heating units is turned on, it corresponds to a Δ TiSo that its corresponding TPractice of≥TTarget-ΔTiIn contrast, in a particular application, the difference can be determined by comparing the respective specific Δ TiAnd (4) carrying out specific setting to enable the actual condition time for quitting each electric heating unit to be matched with the process heating and drying curve.
Or, if the actual temperatures detected in the third preset detection period after starting one electric heating unit at a time all satisfy: t isPractice of≥TTarget+ Δ T ", where Δ T" is the set temperature deviation constant, all activated electrical heating units are turned off.
Specifically, in this embodiment, after a group of electric heating units is turned on, whether all the turned-on electric heating units need to be turned off is controlled, for example, Δ T "may be set to 1, and in a specific application, the actual temperatures detected in the third preset detection period all satisfy: t isPractice of≥TTargetAnd when the temperature of the drying space is within the control range, the temperature can be quickly adjusted back by turning off all the turned-on electric heating units.
In conclusion, in specific application, the stability of temperature rise change of the drying space can be improved through the combination and cooperation of the above embodiments, and the comprehensive guarantee that the temperature control in the temperature rise control stage is matched with the process temperature rise drying curve is realized.
In another embodiment, the performing linkage control on the control object in the drying control stage according to the environmental parameter and the variation gradient thereof includes:
if the drying control stage is a temperature maintaining and humidity discharging control stage, whether the actual humidity of the drying space meets FY is judgedPractice of＞FYTarget+ Δ fy, and when satisfied, control the dehumidifying fan to start at an initial gear, and then whenever it is detected that the actual humidity and the dehumidification rate are both satisfied within a fourth preset detection period: FYPractice of＞FYTarget+ Δ fy and ζPractice of≤ζTargetWhen the temperature is higher than the set temperature, the humidity exhaust fan is turned to be higher by one gear; and
in the operation process of the dehumidifying fan, whether the cooling rate of the drying space meets the following requirements is judged: phi is aPractice of＞φTargetAnd when satisfied, determining the heat pump state, including: closed or open;
controlling the heat pump and the auxiliary electric heating module according to the state of the heat pump, the actual temperature and the change rate of the actual temperature;
wherein, FYPractice ofFor actual humidity of the drying space, FYTargetSet target humidity, Δ fy is set humidity deviation constant, ζPractice ofFor practical dehumidification rates, ζTargetSet target dehumidification rate, phiPractice ofIs the cooling rate of the drying space, phiTargetAnd setting a target cooling rate.
Specifically, this embodiment is an application embodiment of the temperature maintaining and humidity discharging control stage. When the dehumidification fan opens the dehumidification, the heat that will discharge correspondingly, in the correlation technique of heat pump stoving, the operation is opened with big moisture capacity mode to the dehumidification fan, and the moisture evaporation of drying the crop can't be compromise to the too big temperature fluctuation of drying room that leads to of the moisture capacity acutely, influences the stoving room temperature and humidity temperature demand. The problem can be effectively solved through the scheme of the embodiment. Above-mentioned embodiment scheme is in concrete application, according to drying space humidity and change gradient thereof, to the fan that dehumidifies in order to carry out start control from the initialization gear, simultaneously, according to drying space cooling rate, comes to control heat pump and auxiliary electric heating module, realizes then keeping warm and dehumidifying both taking into account humidity and temperature at the control stage of maintaining warm, guarantees both stability that change, and then guarantees the stoving quality of material.
Further, the linkage control of the control object in the drying control stage according to the environmental parameter and the variation gradient thereof further comprises:
after the gear is adjusted once, judging whether the actual humidity and the dehumidification rate meet the requirements in the fourth preset detection period or not by operating a second preset interval time: FYPractice of＞FYTarget+ Δ fy and ζPractice of≤ζTarget。
Specifically, the second preset interval duration may be set to 15 minutes, for example, after the dehumidifying fan is started at the initial gear, after the dehumidifying fan is operated for 30 minutes, it is determined whether the actual humidity and the dehumidification rate both satisfy within the fourth preset detection period: FYPractice of＞FYTarget+ Δ fy and ζPractice of≤ζTargetIf the maximum gear is reached, the operation is kept at the highest gear. By forming the constraint of the second preset interval duration between the two fourth preset detection periods, it is facilitated to realize stable variation of both the dehumidification control and the temperature control.
Further, the linkage control of the control object in the drying control stage according to the environmental parameter and the variation gradient thereof further comprises:
if after a certain gear is adjusted, the actual humidity and the dehumidification rate are both satisfied within a fifth preset detection period: FYPractice of＞FYTarget+ Δ fy and ζPractice of＞ζTargetAnd controlling the moisture exhausting fan to keep the current gear running.
Specifically, in this embodiment, after a gear is adjusted, the judgment control of whether the dehumidifying fan stays in the gear for operation is performed, and when the dehumidifying fan stays in the gear for operation, it is indicated that the dehumidifying rate meets the process requirement.
Or, if after the gear is adjusted for a certain time, the actual humidity is detected to meet the following requirements in a sixth preset detection period: FYPractice of≤FYTargetAnd closing the moisture exhaust fan.
Specifically, after the gear is adjusted for a certain time, when the actual humidity detected in the sixth preset detection period meets the following requirements: FYPractice of≤FYTargetWhen the dehumidification control is beyond the range, the dehumidification control needs to be adjusted back quickly, and then the dehumidification fan can be restarted and controlled according to continuous detection of the humidity and the change of the humidity.
Further, the controlling the heat pump and the auxiliary electric heating module according to the heat pump state, the actual temperature and the change rate thereof includes:
if the heat pump is in a closed state, determining whether to start the operation of the heat pump according to a preset starting judgment condition of the heat pump; and
starting a first group of electric heating units in the auxiliary electric heating module according to the numbering sequence, and detecting that the cooling rate is satisfied every time within a seventh preset detection period: phi is aPractice of＞φTargetThen, a set of electric heating units is sequentially activated.
Specifically, at the end of the temperature rise control stage, when the temperature of the drying space meets the requirement, the auxiliary electric heating module is turned off, and the heat pump may be controlled to be turned on or turned off. After the drying enters the temperature maintaining and humidity discharging control stage, if the heat pump is closed, through the scheme of the embodiment, two aspects of control are simultaneously carried out, on one hand, the judgment condition (for example, T) is judged according to the preset opening of the heat pumpPractice of≤TTarget- Δ T '", Δ T'" being a set temperature deviation constant) to determine whether to turn on the heat pump; on the other hand, the first group of electric heating units in the auxiliary electric heating module is directly started, and every time the cooling rate is detected to meet within a seventh preset detection period, the following steps are carried out: phi is aPractice of＞φTargetWhen the auxiliary electric heating module is started, the first group of electric heating units in the auxiliary electric heating module is directly started to fill the first group of electric heating unitsAnd the heat loss caused by dehumidification is compensated.
Further, the controlling the heat pump and the auxiliary electric heating module according to the heat pump state, the actual temperature and the change rate thereof includes:
if the heat pump is in an on state, the cooling rate is satisfied every time when the eighth preset detection period is detected: phi is aPractice of＞φTargetThen, a group of electric heating units is started according to the numbering sequence.
Specifically, after drying enters the temperature maintaining and humidity discharging control stage, if the heat pump is turned on, the cooling rate is detected to meet the requirement every time in an eighth preset detection period: phi is aPractice of＞φTargetThe judgment of (2) to determine whether to start a group of electric heating units, especially for the start input of the first group of electric heating units, it is required that the cooling rate meets the requirement in the eighth preset detection period under the condition that the heat pump is started: phi is aPractice of＞φTargetAnd the system can be started to ensure dehumidification and effective treatment of temperature compensation.
Further, the controlling the heat pump and the auxiliary electric heating module according to the heat pump state, the actual temperature and the change rate thereof further comprises:
if after starting an electrical heating unit a certain time, whenever detecting that the cooling rate satisfies in a ninth preset detection period: phi is aPractice ofAnd when the starting sequence is less than or equal to 0, closing one group of the started electric heating units according to the reverse sequence of the starting sequence.
Specifically, this embodiment is after opening a set of electric heating unit, and the judgement control that the electrical heating unit that has opened withdraws from in reverse order is carried out, and at the warm dehumidification control stage of maintaining, after opening a set of electric heating unit, the cooling rate in stoving space can obtain controlling, can prevent the decline of cooling rate, detects the cooling rate and all satisfies once in the ninth detection cycle that predetermines once: phi is aPractice ofWhen the temperature is less than or equal to 0, the temperature is effectively controlled, in this case, the temperature may be increased, so that the temperature is reduced by every timeThe rate judgment is used for determining whether to shut down one group of the started electric heating units to realize temperature maintenance.
Further, the controlling the heat pump and the auxiliary electric heating module according to the heat pump state, the actual temperature and the change rate thereof further comprises:
after all the started electric heating units are closed, when the electric heating units in the auxiliary electric heating module are started again, the electric heating units in the auxiliary electric heating module are started according to the reverse order of the last starting order.
Specifically, after the temperature maintaining and humidity discharging control stage enters according to the reverse order of the numbering sequence, according to the gradient condition of the temperature reduction rate, the groups of electric heating units in the auxiliary electric heating module are started in the order of 1, 2, 3, 4 and 5 of the numbering for the first time, then all the electric heating units are gradually closed, in the continuous detection and judgment process of the temperature, the auxiliary electric heating module needs to be used for heating again, in this case, the auxiliary electric heating module is sequentially started according to the order of 5, 4, 3, 2 and 1 of the numbering for the third time, and the auxiliary electric heating module is sequentially started according to the order of 1, 2, 3, 4 and 5 of the numbering for the fourth time, and the auxiliary electric heating module is sequentially started according to the order of 5, 4, 3, 2 and 1 of the numbering for the fourth time. . . And in the opening mode, the balanced opening of each group of electric heating units in the auxiliary electric heating module is facilitated, so that the service life of the electric heating module is ensured.
In conclusion, in specific application, the stability of temperature rise change of the drying space can be improved through the combination and cooperation of the above embodiments, and the temperature control in the temperature maintaining and humidity discharging control stage is comprehensively ensured to be matched with the process temperature rise drying curve.
The preset detection periods may be the same, or may be different, or may be partially the same, according to the specific setting requirement.
Fig. 2 is a schematic structural diagram of a drying system according to an embodiment of the present application, and as shown in fig. 2, the drying system 2 includes:
a memory 201 on which an executable program is stored;
a processor 202 for executing the executable program in the memory 201 to implement the steps of any of the above methods.
With regard to the drying system 2 in the above embodiment, the specific manner of executing the program in the memory 201 by the processor 202 has been described in detail in the embodiment related to the method, and will not be elaborated here.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, the meaning of "plurality" means at least two unless otherwise specified.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. Further, "connected" as used herein may include wirelessly connected. The term "and/or" is used to include any and all combinations of one or more of the associated listed items.
Any process or method descriptions in flow charts or otherwise described herein may be understood as: represents modules, segments or portions of code which include one or more executable instructions for implementing specific logical functions or steps of a process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (11)

1. A control method of a drying system, the drying system comprising: the system comprises a heat pump, an auxiliary electric heating module and a dehumidifying fan, and is characterized in that the method comprises the following steps:
determining an entering drying control stage;
acquiring the environmental parameters of the drying space corresponding to the drying control stage;
performing linkage control on the control object in the drying control stage according to the environmental parameters and the change gradient thereof;
wherein, according to the environmental parameter and the gradient of change thereof, the control object of the drying control stage is subjected to linkage control, including:
if the drying control stage is a temperature rise control stage, starting the heat pump to operate, and judging whether the actual temperature and the temperature rise rate of the drying space meet the following conditions: t isPractice of≤TTarget- Δ T' and ψPractice of≤ψTarget；
If yes, then every time the actual temperature is detected within a first preset detection period, the following conditions are met: t isPractice of≤TTarget- Δ T', activating a group of electric heating units of said auxiliary electric heating module in the order of numbering;
wherein, TPractice ofIs the actual temperature of the drying space, TTargetFor a set target temperature, Δ T' is a set temperature deviation constant, ψPractice ofFor the actual rate of temperature rise, #TargetIs the set target heating rate.
2. The method according to claim 1, wherein the performing the linkage control on the control object in the drying control stage according to the environmental parameter and the variation gradient thereof further comprises:
after each group of electric heating units is started, whether the actual temperature meets the requirements in the first preset detection period or not is judged by running for a first preset interval time: t isPractice of≤TTarget-ΔT′。
3. The method according to claim 1 or 2, wherein the performing the linkage control on the control object of the drying control stage according to the environmental parameter and the variation gradient thereof further comprises:
if after starting an electric heating unit at a certain time, when the actual temperature is detected to satisfy: t isTarget-ΔT′＜TPractice of＜TTarget-ΔTiThe auxiliary heating operation is maintained by the activated electric heating unit, wherein Δ TiSetting a temperature deviation constant, wherein i is 1, 2, …, n is the number of groups of the auxiliary electric heating modules in which the electric heating units are started; alternatively, the first and second electrodes may be,
if after starting an electric heating unit a certain time, every time the actual temperature is detected in a second preset detection period, the following conditions are met: t isPractice of≥TTarget-ΔTiWhen the starting sequence is the reverse sequence, closing one group of the started electric heating units; alternatively, the first and second electrodes may be,
if after starting an electric heating unit at a certain time, the actual temperature detected in a third preset detection period meets the following conditions: t isPractice of≥TTarget+ Δ T ", where Δ T" is the set temperature deviation constant, all activated electrical heating units are turned off.
4. The method according to claim 1, wherein the performing the linkage control on the control object in the drying control stage according to the environmental parameter and the variation gradient thereof comprises:
if the drying control stage is a temperature maintaining and humidity discharging control stage, whether the actual humidity of the drying space meets FY is judgedPractice of＞FYTarget+ Δ fy, and when satisfied, controlling the dehumidifying fan to start in an initial gear, and thereafterEvery time the actual humidity and the dehumidification rate are both satisfied within a fourth preset detection period: FYPractice of＞FYTarget+ Δ fy and ζPractice of≤ζTargetWhen the temperature is higher than the set temperature, the humidity exhaust fan is turned to be higher by one gear; and
in the operation process of the dehumidifying fan, whether the cooling rate of the drying space meets the following requirements is judged: phi is aPractice of＞φTargetAnd when satisfied, determining the heat pump state, including: closed or open;
controlling the heat pump and the auxiliary electric heating module according to the state of the heat pump, the actual temperature and the change rate of the actual temperature;
wherein, FYPractice ofFor actual humidity of the drying space, FYTargetSet target humidity, Δ fy is set humidity deviation constant, ζPractice ofFor practical dehumidification rates, ζTargetSet target dehumidification rate, phiPractice ofIs the cooling rate of the drying space, phiTargetAnd setting a target cooling rate.
5. The method according to claim 4, wherein the linkage control of the control object in the drying control stage according to the environmental parameter and the variation gradient thereof further comprises:
if after a certain gear is adjusted, the actual humidity and the dehumidification rate are both satisfied within a fifth preset detection period: FYPractice of＞FYTarget+ Δ fy and ζPractice of＞ζTargetControlling the moisture exhausting fan to keep running at the current gear; alternatively, the first and second electrodes may be,
if after a certain gear is adjusted, the actual humidity detected in the sixth preset detection period meets the following conditions: FYPractice of≤FYTargetAnd closing the moisture exhaust fan.
6. The method according to claim 4, wherein the linkage control of the control object in the drying control stage according to the environmental parameter and the variation gradient thereof further comprises:
after the gear is adjusted once, judging whether the actual humidity and the dehumidification rate meet the requirements in the fourth preset detection period or not by operating a second preset interval time: FYPractice of＞FYTarget+ Δ fy and ζPractice of≤ζTarget。
7. The method of claim 4, wherein said controlling the heat pump and the auxiliary electric heating module based on the heat pump state and the actual temperature and rate of change thereof comprises:
if the heat pump is in a closed state, determining whether to start the operation of the heat pump according to a preset starting judgment condition of the heat pump; and
starting a first group of electric heating units in the auxiliary electric heating module according to the numbering sequence, and detecting that the cooling rate is satisfied every time within a seventh preset detection period: phi is aPractice of＞φTargetThen, a set of electric heating units is sequentially activated.
8. The method of claim 4, wherein said controlling the heat pump and the auxiliary electric heating module based on the heat pump state and the actual temperature and rate of change thereof comprises:
if the heat pump is in an on state, the cooling rate is satisfied every time when the eighth preset detection period is detected: phi is aPractice of＞φTargetThen, a group of electric heating units is started according to the numbering sequence.
9. The method of claim 7 or 8, wherein said controlling said heat pump and said auxiliary electric heating module based on said heat pump status and actual temperature and rate of change thereof, further comprises:
if after starting an electrical heating unit a certain time, whenever detecting that the cooling rate satisfies in a ninth preset detection period: phi is aPractice ofWhen the opening sequence is less than or equal to 0, closing the valve according to the reverse sequence of the opening sequenceOne group of activated electrical heating units.
10. The method of claim 9 wherein said controlling said heat pump and said auxiliary electric heating module based on said heat pump state and actual temperature and rate of change thereof further comprises:
after all the started electric heating units are closed, when the electric heating units in the auxiliary electric heating module are started again, the electric heating units in the auxiliary electric heating module are started according to the reverse order of the last starting order.
11. A drying system, comprising:
a memory having an executable program stored thereon;
a processor for executing the executable program in the memory to implement the steps of the method of any one of claims 1-10.
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