CN106500495A - A kind of frequency conversion capability-variable heat pump hot air drying system and its control method - Google Patents
A kind of frequency conversion capability-variable heat pump hot air drying system and its control method Download PDFInfo
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- CN106500495A CN106500495A CN201611169024.5A CN201611169024A CN106500495A CN 106500495 A CN106500495 A CN 106500495A CN 201611169024 A CN201611169024 A CN 201611169024A CN 106500495 A CN106500495 A CN 106500495A
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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
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
Abstract
A kind of frequency conversion capability-variable heat pump hot air drying system and its control method, it is related to supply or the control device of the air or gas of drying solid material or product, more particularly to a kind of heat-pump-type hot air drying system and for the control method of the system, source pump includes invariable frequency compressor and frequency-changeable compressor, determine frequency circulation line and frequency conversion circulation line, and by the first solenoid valve block and the heat exchanger transfiguration branch road of the second solenoid valve block control connection；Control device is connected to the first solenoid valve block and the second solenoid valve block, controls the opening state of the first solenoid valve block and the second solenoid valve block, changes the connected mode of heat exchanger transfiguration branch road, and control heat pump hot air drying system enters two-shipper transfiguration operational mode；By will determine display system and frequency conversion system parallel running, frequency will be determined and frequency conversion two systems is fully fused together, two-shipper transfiguration operational mode is realized by fixed change combination, met temperature change in drying room baking process and energy consumption change is required.
Description
Technical field
The present invention relates to the supply of the air or gas of drying solid material or product or control device, more particularly to one
Plant heat-pump-type hot air drying system and the control method for the system.
Background technology
Need the place of hot-air seasoning more and more in the market, such as tobacco dryings, grain heat-drying, medicinal material drying, really
Place is dried in vegetable drying etc., dries and is mainly dried with coal stove, steam stove, electric furnace.Coal, gas are all non-renewable strategic performances
Source, is not direction that country promotes, and electric furnace is also not suitable for carrying out batch popularization because power consumption is big, operating cost is high.Northern country
All it is to carry out heating with coal stove manufacture hot water before heating, country replaces coal stove to popularize in an all-round way using heat pump in rural area, it was demonstrated that
Heat pump still has very big market prospects in terms of heating.Heat pump also has very big sending out in the place of above-mentioned hot-air seasoning demand
Exhibition potentiality.By taking the baking equipment for preparatory treatment of tobacco of China as an example, traditional civil structure natural ventilation type barn is continued to use for a long time, although often
There are some improvement transformations, but still without departing from traditional form.China was introduced with fuel oil, fire coal directly from the nineties in 20th century
The dense drying equipment of heat supply and boiler heat supplying, in various places, experiment and demonstration has reacted easy baking operating technology, saving recruitment, energy
Ensure the advantages such as baking quality of tobacco, but one-time investment is relatively costly, fuel consumption is larger, wants spread to have very at no distant date
Big difficulty, in practice it has proved that be not suitable for China's national situation, it is impossible to received by production.Tobacco flue-curing is an a large amount of heat dissipation process, general
Logical barn coal direct heating, heat utilization efficiency are low, and coal consumption is high, generally dry 1kg tobacco leaves coal consumption and mark coal in 1.5～2.5kg,
Environmental pollution is serious.A kind of Chinese invention patent " tobacco baking room with air source heat pump as thermal source " (patent of invention number：
200910044468.X, Authorization Notice No.：CN101940358B) disclose a kind of tobacco with air source heat pump as thermal source to bake
Room, including being provided with the heating chamber of fresh wind port and being provided with the hothouse of temperature, moisture probe, is provided with moisture exhausting port, also wraps above barn
The span of ratio of air source heat pump and condenser fan, condenser heat exchange area and compressor power input is included in 7-
Between 15m2/kw, condenser and its air draught type breeze fan device are indoor in the heating；The hothouse and/or heating chamber
It is provided with heat-insulation layer.The technical scheme makes air source heat pump using air source heat pump and solar energy as the novel heat source of tobacco baking room
Great expansion has been obtained with the range of application of solar energy, produce cigarette district promote the use of on a large scale can reduce air, soil and
The sulfur content of tobacco leaf, improves quality of tobacco, there is positive effect to energy saving, environmental protection.But, in the Roaster of tobacco
In terms of skill, various places have researched and proposed " double low " baking process of five-part form, seven segmentations and six segmentations etc. in succession.Every kind of baking process
Tobacco flue-curing overall process is divided into changing yellow stage, fixation stage, drying muscle stage all, having clear and definite humiture to refer to all is specified to each period
Mark, the multisection type stoving process figure of part kind tobacco shown in Figure 9.Due to baking process paragraph divide many and thin, especially
It is tobacco leaf change is divided level many and obscure, non-quantitative, not simple clear and definite key point technical sophistication, is not easy to slap
Hold, existing heat pump drying system can not similarly meet the requirement of tobacco roasting.
On the other hand, drying part-time section due to some high temperature needs more than 80 DEG C of hot blast leaving air temp, how to carry
It is that heat-pump-type hot air drying system needs another problem for solving for high-temperature hot-air.A kind of Chinese invention patent application " superelevation
Warm heat pump drying system " (application for a patent for invention number：201510433292.2, publication number：CN105021015A) one kind is disclosed
Superhigh temperature heat pump drying system, including drying room, the air -return duct connected with the air outlet and return airway of the drying room, is arranged at back
Circulating fan in air channel, the exhausting duct connected with air -return duct are arranged at the air exhauster of the passway of exhausting duct, are arranged at return air
The air heat recovery device of the intersection of road and exhausting duct, and at least two sets source pumps used in parallel；The invention is adopted
Two sets or more than two sets source pump parallel operations, are drying the operation process initial stage by the low-grade surrounding air heat pair of absorption
Drying room carries out heater riser temperature, and the hot and humid air to a certain extent afterwards to discharging in drying room that heats up dehumidifies, to which
In contained sensible heat and latent heat carry out maximized recovery.Cycle fluid temperature range of the system using two sets of source pumps
Difference relatively higher wind pushing temperature is provided, while ensureing that the evaporating temperature of Drying unit is fully improved.But, the existing skill
Art scheme adopts two sets of source pumps, and this not only causes drying room equipment investment to significantly improve, by cycle fluid temperature range
Difference improves the complexity that wind pushing temperature also add plant maintenance.Simultaneously as in drying course drying room heat consumption demand
Change is very big, and this does not only result in the frequent start-stop of source pump, increases the operation power consumption of unit, reduces the efficiency of unit, can also
The temperature change in drying room is made to become big, or even the quality that finished product can be affected because drying temperature change is excessive.
Content of the invention
The invention aims to a kind of frequency conversion capability-variable heat pump hot air drying system is provided, for solving existing Heat Pump
Wind drying system provides the technical problem existed during high-temperature hot-air.
The present invention solves the technical scheme that adopted of above-mentioned technical problem：
A kind of frequency conversion capability-variable heat pump hot air drying system, including source pump, hot blast rack and drying room, is connected to hot blast
Air-supply closed circuit between rack and drying room, and for realize hot air drying system microprocessor control control device；
It is characterized in that：
Described source pump includes invariable frequency compressor and frequency-changeable compressor, and be connected in parallel determines frequency circulation line and frequency conversion
Circulation line, and by the first solenoid valve block and the heat exchanger transfiguration branch road of the second solenoid valve block control connection；
Described determines frequency circulation line from the beginning of the exhaust outlet of invariable frequency compressor, passes sequentially through the first condenser, first swollen
Swollen valve, the first evaporimeter and the first gas-liquid separator, return to the air entry of invariable frequency compressor；
Described frequency conversion circulation line passes sequentially through the 3rd condenser, second swollen from the beginning of the exhaust outlet of frequency-changeable compressor
Swollen valve, the 3rd evaporimeter and the second gas-liquid separator, return to the air entry of frequency-changeable compressor；
Described heat exchanger transfiguration branch road includes the second condenser and the second evaporimeter, and described the second condenser is by the
One solenoid valve block is parallel-connected to the first condenser, is parallel-connected to the 3rd condenser by the second solenoid valve block；Described
Two evaporimeters are parallel-connected to the first evaporimeter by the first solenoid valve block, are parallel-connected to the 3rd steaming by the second solenoid valve block
Send out device；
Described control device is connected to the first solenoid valve block and the second solenoid valve block, by control the first solenoid valve block and
The opening state of the second solenoid valve block, changes the connected mode of heat exchanger transfiguration branch road, and control heat pump hot air drying system is entered
Two-shipper transfiguration operational mode.
One kind preferably technical scheme of the frequency conversion capability-variable heat pump hot air drying system of the present invention, it is characterised in that described
Hot blast rack includes basic wind-warm syndrome area and the reheating heating zone being separated to form by air-supply regulating valve；The first described condenser and
The refrigerant line of two condensers is connected in series composition double series condenser；First condenser is placed in again as sensible heat condenser
Hot heating zone, the second condenser are placed in the inlet side in basic wind-warm syndrome area as latent heat condenser, and the 3rd condenser is placed in basic wind
The air side of warm area；Described hot blast rack arranges the interior circulation loop in the basic wind-warm syndrome area of connection；Heat pump hot air drying system is defeated
The hot blast for going out, by interior circulation loop and the secondary heat exchange of air-supply closed circuit, makes leaving air temp can reach 90 DEG C.
A kind of superior technique scheme of the frequency conversion capability-variable heat pump hot air drying system of the present invention, it is characterised in that described
Two-shipper transfiguration operational mode include frequency conversion constant volume pattern, frequency conversion varying capacity pattern, to determine frequency varying capacity+frequency conversion constant volume in parallel
Operational mode, frequency conversion constant volume pattern+frequency conversion varying capacity parallel running mode and determine frequency constant volume+frequency conversion varying capacity parallel running
Pattern, wherein：
Frequency conversion constant volume pattern：Frequency-changeable compressor start, cold-producing medium along frequency conversion circulation line circulate, the first solenoid valve block and
Second solenoid valve block is turned off；
Frequency conversion varying capacity pattern：Frequency-changeable compressor starts, and cold-producing medium is circulated along frequency conversion circulation line；First solenoid valve block is closed
Close, the second solenoid valve block is opened, described heat exchanger transfiguration branch circuit parallel connection is connected to frequency conversion circulation line, frequency-changeable compressor is entered
Varying capacity operational mode；
Determine frequency varying capacity+frequency conversion constant volume parallel running mode：Invariable frequency compressor and frequency-changeable compressor start simultaneously, refrigeration
Frequency circulation line and the circulation of frequency conversion circulation line two-way are determined in edge simultaneously for agent；First solenoid valve block is opened, and the second solenoid valve block is closed,
Described heat exchanger transfiguration branch circuit parallel connection is connected to determines frequency circulation line, and invariable frequency compressor enters varying capacity operational mode；
Determine frequency constant volume+frequency conversion varying capacity parallel running mode：Invariable frequency compressor and frequency-changeable compressor start simultaneously, refrigeration
Frequency circulation line and the circulation of frequency conversion circulation line two-way are determined in edge simultaneously for agent；First solenoid valve block is closed, and the second solenoid valve block is opened,
Described heat exchanger transfiguration branch circuit parallel connection is connected to frequency conversion circulation line, and frequency-changeable compressor enters varying capacity operational mode.
Another object of the present invention is to provide for a kind of control for above-mentioned frequency conversion capability-variable heat pump hot air drying system
Method processed.The present invention solves the technical scheme that adopted of above-mentioned technical problem：
A kind of heat pump hot air drying system control method for above-mentioned frequency conversion capability-variable heat pump hot air drying system, its are special
Levy and be to comprise the following steps：
S100：Configuration temperature control parameter, preserves default temperature control parameter of curve；
S200：Detection leaving air temp and drying room humiture；
S300：According to the demand heat consumption that default temperature control curve dynamic arranges present period；
S400：Demand heat consumption according to present period selects the two-shipper transfiguration operational mode of system.
One kind preferably technical scheme of the heat pump hot air drying system control method of the present invention, it is characterised in that described
Step S400 includes following control operation action：
S420：If demand heat consumption ＜ 25%, start frequency-changeable compressor, close the first solenoid valve block and the second magnetic valve
Group, enters frequency conversion constant volume pattern；
S440：If demand heat consumption ＜ 35%, start frequency-changeable compressor, close the first solenoid valve block, open the second electromagnetism
Valve group, enters frequency conversion varying capacity pattern；
S460：If demand heat consumption >=70%, goes to step S480；Otherwise, while starting invariable frequency compressor and frequency conversion compression
Machine, opens the first solenoid valve block, closes the second solenoid valve block, enters and determines frequency varying capacity+frequency conversion constant volume parallel running mode；
S480：Start invariable frequency compressor and frequency-changeable compressor simultaneously, close the first solenoid valve block, open the second magnetic valve
Group, enters and determines frequency constant volume+frequency conversion varying capacity parallel running mode.
The invention has the beneficial effects as follows：
1st, frequency conversion capability-variable heat pump hot air drying system of the invention and its control method, by will determine display system and frequency conversion
System parallel running, will determine frequency and frequency conversion two systems are fully fused together, and realize that two-shipper transfiguration runs by fixed change combination
Pattern, the temperature change and energy consumption change met in drying room baking process are required；Secondary changing is realized by arranging interior circulation loop
Heat, makes the leaving air temp of hot blast rack can reach 90 DEG C.
2nd, frequency conversion capability-variable heat pump hot air drying system of the invention and its control method, by evaporation side and condensation side
Using variable capacity technology, in frequency conversion system during height frequency reasonable distribution evaporimeter and condenser heat exchange area, Ji Nengbao
The reliability of card product, can reach raising unit efficiency again, reduce the purpose of energy resource consumption.
3rd, frequency conversion capability-variable heat pump hot air drying system of the invention and its control method, according to the default temperature control of drying room technique
Curve dynamic setting demand heat consumption, selects the operational mode of system according to the demand heat consumption of present period, meets and toasted
In journey, temperature, the high accuracy control of humidity are required.
Description of the drawings
Fig. 1 is the double circulation structure schematic diagram of heat-pump-type Two-way Cycle hot air drying system；
Fig. 2 is the source pump schematic diagram of heat-pump-type Two-way Cycle hot air drying system；
Fig. 3 is that heat pump hot air drying system determines frequency frequency conversion double circulation structure schematic diagram；
Fig. 4 is the source pump schematic diagram of frequency conversion capability-variable heat pump hot air drying system；
Fig. 5 is the control device schematic diagram of frequency conversion capability-variable heat pump hot air drying system；
Fig. 6 is the control method flow chart of heat-pump-type Two-way Cycle hot air drying system；
Fig. 7 is the control method flow chart of frequency conversion capability-variable heat pump hot air drying system；
Fig. 8 is multi-segment type temperature control curve and temperature control parameter configuration interface schematic diagram；
Fig. 9 is the multisection type stoving process figure of part kind tobacco flue-cured tobacco；
Figure 10 is each period heat consumption curve map during flue-cured tobacco.
The reference of each part in above figure：1 is compressor, and 1-1 is invariable frequency compressor, and 1-2 is frequency-changeable compressor, 2-
1 be the first condenser, 2-2 be the second condenser, 2-3 be the 3rd condenser, 21 be latent heat condenser, 22 be sensible heat condenser, 3
For expansion valve, 3-1 is the first expansion valve, and 3-1A is the first balance pipe, and 3-1B is the first temperature-sensitive bag, and 3-2 is the second expansion valve, 3-
2A is the second balance pipe, and 3-2B is the second temperature-sensitive bag, and 4 is evaporimeter, and 4-1 is the first evaporimeter, and 4-2 is the second evaporimeter, 4-3
For the 3rd evaporimeter, 5 is vapour liquid separator, and 5-1 is the first gas-liquid separator, and 5-2 is the second gas-liquid separator, and 6 is evaporimeter
Blower fan, 7-1 are the first solenoid valve block, and 7-2 is the second solenoid valve block, and 8 is pressure fan, and 10 is first throttle valve, and 11 is second section
Stream valve, 12 is off-load magnetic valve, and 23 is interior circulation air-valve, and 24 are air-supply regulating valve, and 100 is source pump, and 200 is air-heater
Cabinet, 210 is supply air duct, and 220 is interior circulation air channel, and 230 is return airway, and 400 is drying room, and 500 is control device, and 510 are
Operating parameter setting module, 520 is drying room temperature and humidity monitor module, and 521 is dry-bulb temperature sensor, and 522 pass for wet-bulb temperature
Sensor, 530 is wind pushing temperature monitoring module, and 531 is leaving air temp sensor, and 540 is valve area controller, and 550 is heat pump
Generator set controller.
Specific embodiment
For better understanding of the above-mentioned technical proposal of the present invention, carry out with reference to the accompanying drawings and examples further
Describe in detail.Fig. 1 is one embodiment of the heat-pump-type Two-way Cycle hot air drying system of the present invention, including source pump 100, heat
Fan cabinet 200 and drying room 400, and for realize hot air drying system microprocessor control control device 500；Such as Fig. 1 institutes
Show, described heat-pump-type Two-way Cycle hot air drying system also includes that the hot blast pair that air-supply closed circuit and interior circulation loop are constituted is followed
Loop back path；
Inside the hot blast rack 200 arrange air-supply regulating valve 24, based on hot blast rack 200 is separated wind-warm syndrome area and
Reheating heating zone；
The latent heat condenser 21 for being placed in basic wind-warm syndrome area and the sensible heat condenser 22 for being placed in reheating heating zone, by heat pump machine
The refrigerant line of group 100 is connected in series composition double series condenser；The high temperature liquid refrigerant that compressor is discharged, first sends into
Latent heat condenser 21 is re-fed into after the heat exchange cooling of sensible heat condenser 22；
Described air-supply closed circuit enters hot blast rack 200 from drying room 400 through return airway 230, by being placed in basis
The latent heat condenser 21 of wind-warm syndrome area inlet side enters pressure fan 8, then reaches the sensible heat of reheating heating zone through regulating valve 24 of blowing
Condenser 22, sends into drying room 400 finally by supply air duct 210；
Described interior circulation loop enters interior circulation air channel 220, Ran Houjing from 8 exhaust outlet of pressure fan through interior circulation air-valve 23
Return airway 230 enters hot blast rack 200, reaches the latent heat condenser 21 of basic wind-warm syndrome area inlet side, eventually passes back to pressure fan 8
Air entry；From the air-flow that drying room 400 enters basic wind-warm syndrome area, a part is transmitted back to return airway by interior circulation air channel 220
230, latent heat condenser 21 is sent to after mixing with drying room return air, forms the interior circulation loop of Wind Volume circulation, another part is through sending
Wind regulating valve 24 is sent to sensible heat condenser 22 and carries out secondary heat exchange, and sends into drying room 400 by supply air duct 210, forms little wind
The air-supply closed circuit of amount circulation.Latent heat in cold-producing medium is little by little transferred to the big of interior circulation loop by latent heat condenser 21
In air quantity circulating current, basic wind-warm syndrome is improved by the condensation latent heat for fully absorbing cold-producing medium；Compressor discharge temperature is up to 130
DEG C gaseous refrigerant in sensible heat, through 22 secondary heat exchange of sensible heat condenser be transferred to air-supply closed circuit little air quantity circulating air
In stream；Sensible heat condenser 22 can absorb 30% or so system heat energy, and the leaving air temp of hot blast rack 200 can be made to reach 90
℃.
Described control device 500 is adjusted air-supply and is followed by the aperture for controlling interior circulation air-valve 23 with regulating valve 24 of blowing
Loop back path and the air circulation in interior circulation loop, control the leaving air temp of hot blast rack 200.
The embodiment of the source pump of the heat-pump-type Two-way Cycle hot air drying system of the present invention according to Fig. 2, described
Source pump 100 include the major cycle pipeline of cold-producing medium and being connected to the two-way off-load branch road of major cycle pipeline；Described master
Circulation line passes sequentially through sensible heat condenser 22, latent heat condenser 21, expansion valve 3, evaporation from the beginning of the exhaust outlet of compressor 1
Device 4 and vapour liquid separator 5, return to the air entry of compressor 1；Described two-way off-load route off-load magnetic valve 12, first segment
Stream valve 10 and the connection composition of second throttle 11：The entrance of the off-load magnetic valve 12 is parallel-connected to the system of latent heat condenser 21
Refrigerant circuit is exported, and the entrance of the first throttle valve 10 and second throttle 11 is parallel-connected to going out for off-load magnetic valve 12
Mouthful, the outlet of the first throttle valve 10 is connected to the entrance of evaporimeter 4, and the outlet of the second throttle 11 is connected to vapour-liquid
The entrance of separator 5；Described control device 500 is connected to first throttle valve 10, second throttle 11 and off-load magnetic valve 12,
According to the refrigerant circulation line that leaving air temp dynamic changes source pump, the row for reducing compressor 1 by two-way off-load branch road
Temperature degree and high side pressure, realize the Two-way Cycle dynamic operational of hot air drying system.
According to one embodiment of the heat-pump-type Two-way Cycle hot air drying system of the present invention, described Two-way Cycle dynamic operation
Pattern includes single cycle conventional heating pattern, Two-way Cycle step-down off-load pattern, Two-way Cycle cooling off-load pattern and Two-way Cycle two-way
Off-load pattern, wherein：
Single cycle conventional heating pattern：Off-load magnetic valve 12 cuts out, and cold-producing medium is circulated along major cycle pipeline；Interior circulation air-valve
23 apertures 0%, 24 aperture 100% of regulating valve of blowing, described Two-way Cycle hot air drying system are produced by closed circuit of blowing
Low temperature hot blast of the leaving air temp less than 45 DEG C；Described control device 500 is by changing the run time interval of compressor 1 or transporting
Line frequency controls leaving air temp；
Two-way Cycle is depressured off-load pattern：Off-load magnetic valve 12 and second throttle 11 are opened, and first throttle valve 10 is closed, system
While circulating along major cycle pipeline, a part is shunted through off-load magnetic valve 12 and is directly entered by second throttle 11 cryogen
Enter vapour liquid separator 5, to reduce high side pressure；23 aperture 50% to 55% of interior circulation air-valve, 24 aperture of regulating valve of blowing
50% to 45%；Described control device 500 is controlled out by adjusting the air circulation of air-supply closed circuit and interior circulation loop
Air temperature, produces the middle warm wind that leaving air temp is 45 to 65 DEG C；
Two-way Cycle cooling off-load pattern：Off-load magnetic valve 12 and first throttle valve 10 are opened, and second throttle 11 is closed, system
While circulating along major cycle pipeline, a part is shunted and by parallel with expansion valve 3 the cryogen through off-load magnetic valve 12
One choke valve 10 enters evaporimeter 4, to reduce delivery temperature；23 aperture 55% to 65% of interior circulation air-valve, regulating valve 24 of blowing
Aperture 45% to 35%；Air circulation control of the described control device 500 by regulation air-supply closed circuit and interior circulation loop
Air temperature is made, the high temperature hot blast that leaving air temp is 65 to 75 DEG C is produced；
Two-way Cycle two-way off-load pattern：Off-load magnetic valve 12 and first throttle valve 10, second throttle 11 are opened, cold-producing medium
While circulating along major cycle pipeline, shunt through off-load magnetic valve 12, cold-producing medium after a shunting part by with expansion valve 3
First throttle valve 10 in parallel enters evaporimeter 4, and another part is directly entered vapour liquid separator 5 by second throttle 11；Interior
Circulation 23 aperture 65% to 75% of air-valve, 24 aperture 35% to 25% of regulating valve of blowing；Described control device 500 is by adjusting
The air circulation control leaving air temp in air-supply closed circuit and interior circulation loop, produces high warm of the leaving air temp higher than 75 DEG C
Wind.
Heat consumption changes in demand for drying room in drying course is big, causes what the frequent start-stop of unit and efficiency reduced to ask
Topic, in one embodiment of the heat pump hot air drying system of the present invention, described source pump 100 is also included using frequency conversion pressure
The second refrigerant circulation line of contracting machine；The 3rd condenser 2-3 being connected in second refrigerant circulation line is arranged on hot blast
In rack 200, the air side in the basic wind-warm syndrome area is placed in, referring to Fig. 3；As the demand heat consumption ＜ 40% of drying room, fixed frequency
Compressor stops, and frequency-changeable compressor starts, and heat pump hot air drying system is run with conventional inverter heat pump mode；Demand when drying room
During heat consumption >=40%, invariable frequency compressor and frequency-changeable compressor start simultaneously, and heat pump hot air drying system is determining frequency+frequency conversion two-shipper
Paralleling model runs；When the design temperature of air-supply is higher than 75 DEG C, heat pump hot air drying system is with Two-way Cycle two-way off-load pattern
Operation, the three-level of described latent heat condenser 21, the 3rd condenser 2-3 and the formation hot blast of sensible heat condenser 22 rack 200 exchange heat
Structure；The circulating current in interior circulation loop is exchanged heat twice by latent heat condenser 21 and the 3rd condenser 2-3, further improves base
The basic wind-warm syndrome in plinth wind-warm syndrome area, makes the leaving air temp of hot blast rack 200 bring up to more than 75 DEG C.
One embodiment of the source pump of the frequency conversion capability-variable heat pump hot air drying system of the present invention is as shown in figure 4, institute
The source pump 100 that states includes invariable frequency compressor 1-1 and frequency-changeable compressor 1-2, and be connected in parallel determines frequency circulation line and frequency conversion
Circulation line, and by the first solenoid valve block 7-1 and the heat exchanger transfiguration branch road of the second solenoid valve block 7-2 control connection；
Described determines frequency circulation line from the beginning of the exhaust outlet of invariable frequency compressor 1-1, pass sequentially through the first condenser 2-1,
First expansion valve 3-1, the first evaporimeter 4-1 and the first gas-liquid separator 5-1, return to the air entry of invariable frequency compressor 1-1；
Described frequency conversion circulation line from the beginning of the exhaust outlet of frequency-changeable compressor 1-2, pass sequentially through the 3rd condenser 2-3,
Second expansion valve 3-2, the 3rd evaporimeter 4-3 and the second gas-liquid separator 5-2, return to the air entry of frequency-changeable compressor 1-2；
Described heat exchanger transfiguration branch road includes the second condenser 2-2 and the second evaporimeter 4-2, the second described condenser
2-2 is parallel-connected to the first condenser 2-1 by the first solenoid valve block 7-1, is parallel-connected to by the second solenoid valve block 7-2
Three condenser 2-3；The second described evaporimeter 4-2 is parallel-connected to the first evaporimeter 4-1 by the first solenoid valve block 7-1, leads to
Cross the second solenoid valve block 7-2 and be parallel-connected to the 3rd evaporimeter 4-3；
Described control device 500 is connected to the first solenoid valve block 7-1 and the second solenoid valve block 7-2, by control first
Solenoid valve block 7-1 and the opening state of the second solenoid valve block 7-2, change the connected mode of heat exchanger transfiguration branch road, control heat pump
Hot air drying system enters two-shipper transfiguration operational mode；Described control device 500 controls frequency conversion pressure according to air-out design temperature
The running frequency of contracting machine 1-2；The frequency conversion capability-variable heat pump hot air drying system of the present invention, is expanded by varying capacity operational mode and is changed
The heat exchange area of hot device (including evaporimeter and condenser), can significantly improve the overall heat exchange effect of source pump 100, improve
System energy efficiency.
According to one embodiment of the frequency conversion capability-variable heat pump hot air drying system of the present invention, described two-shipper transfiguration operation
Pattern includes that frequency conversion constant volume pattern, frequency conversion varying capacity pattern determine frequency varying capacity+frequency conversion constant volume parallel running mode, frequency conversion
Constant volume pattern+frequency conversion varying capacity parallel running mode, and determine frequency constant volume+frequency conversion varying capacity parallel running mode, wherein：
Frequency conversion constant volume pattern：Frequency-changeable compressor 1-2 starts, and cold-producing medium is circulated along frequency conversion circulation line, the first magnetic valve
Group 7-1 and the second solenoid valve block 7-2 are turned off；
Frequency conversion varying capacity pattern：Frequency-changeable compressor 1-2 starts, and cold-producing medium is circulated along frequency conversion circulation line；First magnetic valve
Group 7-1 is closed, and the second solenoid valve block 7-2 is opened, and described heat exchanger transfiguration branch circuit parallel connection is connected to frequency conversion circulation line, frequency conversion
Compressor 1-2 enters varying capacity operational mode；
Determine frequency varying capacity+frequency conversion constant volume parallel running mode：Invariable frequency compressor 1-1 and frequency-changeable compressor 1-2 is opened simultaneously
Dynamic, frequency circulation line and the circulation of frequency conversion circulation line two-way are determined in edge to cold-producing medium simultaneously；First solenoid valve block 7-1 is opened, the second electricity
Magnet valve group 7-2 is closed, and described heat exchanger transfiguration branch circuit parallel connection is connected to determines frequency circulation line, and invariable frequency compressor 1-1 is entered and become
Capacity operational mode；
Determine frequency constant volume+frequency conversion varying capacity parallel running mode：Invariable frequency compressor 1-1 and frequency-changeable compressor 1-2 is opened simultaneously
Dynamic, frequency circulation line and the circulation of frequency conversion circulation line two-way are determined in edge to cold-producing medium simultaneously；First solenoid valve block 7-1 is closed, the second electricity
Magnet valve group 7-2 is opened, and described heat exchanger transfiguration branch circuit parallel connection is connected to frequency conversion circulation line, and frequency-changeable compressor 1-2 is entered and become
Capacity operational mode.
According to the embodiment of a heat pump hot air drying system for being preferred for needing higher drying temperature, the air-heater
Cabinet 200 includes basic wind-warm syndrome area and the reheating heating zone being separated to form by air-supply regulating valve 24；Described the first condenser 2-1 and
The refrigerant line of the second condenser 2-2 is connected in series composition double series condenser；First condenser 2-1 is condensed as sensible heat
Device is placed in reheating heating zone, and the second condenser 2-2 is placed in the inlet side in basic wind-warm syndrome area, the 3rd condenser as latent heat condenser
2-3 is placed in the air side in basic wind-warm syndrome area；Described hot blast rack 200 arranges the interior circulation loop in the basic wind-warm syndrome area of connection, ginseng
See Fig. 3；The hot blast of heat pump hot air drying system output, by interior circulation loop and the secondary heat exchange of air-supply closed circuit, makes heat
The leaving air temp of fan cabinet 200 can reach 90 DEG C.
The present invention frequency conversion capability-variable heat pump hot air drying system control device 500 one embodiment as shown in figure 5,
Including for configuring temperature control parameter and preserving the operating parameter setting module 510 of default temperature control parameter of curve, for detecting
With monitoring leaving air temp and drying room humiture drying room temperature and humidity monitor module 520 and wind pushing temperature monitoring module 530, for driving
The valve area controller 540 of dynamic air-valve, and for controlling the source pump controller 550 of compressor and magnetic valve；Described
The input of drying room temperature and humidity monitor module 520, is connected to operating parameter setting module 510, dry-bulb temperature sensor 521 and wet
Ball temperature sensor 522；The output end of the drying room temperature and humidity monitor module 520 is connected to source pump controller 550；Heat pump
The output end of generator set controller 550 is connected to the control magnetic valve in compressor and refrigerant line；The wind pushing temperature monitoring
The input of module 530, is connected to operating parameter setting module 510 and leaving air temp sensor 531；The wind pushing temperature monitoring
The output end of module 530 is connected to valve area controller 540, and the output end of valve area controller 540 is connected to interior circulation
Air-valve 23 and air-supply regulating valve 24.Off-load magnetic valve 12 that described control magnetic valve includes being connected in refrigerant line, the
One choke valve 10, second throttle 11, the first solenoid valve block 7-1 and the second solenoid valve block 7-2.
According to one embodiment of the frequency conversion capability-variable heat pump hot air drying system of the present invention, described control device 500
Programme-control, described operation are realized using the chip microprocessor with multi-channel A/D translation interfaces and multi-channel PWM output interface
Parameter setting module 510, drying room temperature and humidity monitor module 520 and wind pushing temperature monitoring module 530 are the soft of microprocessor offer
Part functional module；Described dry-bulb temperature sensor 521, leaving air temp sensor 531 and wet bulb temperature sensor 522 are by micro-
The A/D translation interfaces of processor are connected to chip microprocessor；Described control device 500 is exported using the PWM of microprocessor,
Valve area controlled output signal is provided for valve area controller 540, and frequency conversion is provided by source pump controller 550
The VFC output signal of compressor and frequency conversion fan；PIO program to ports of the described control device 500 using microprocessor
Output solenoid valve and the switch output signal of compressor, by source pump controller 550 to system in compressor and electromagnetism
Valve executes switch control rule.
Fig. 6 is one embodiment of the heat-pump-type Two-way Cycle hot air drying system control method of the present invention, including following step
Suddenly：
S100：Configuration temperature control parameter, preserves default temperature control parameter of curve；
S200：Detection leaving air temp and drying room humiture；
S300：According to default temperature control curve dynamic adjustment design temperature；
S400：According to the Two-way Cycle dynamic operational that current design temperature selects system.
Embodiment 1：
One embodiment of multi-segment type temperature control curve and temperature control parameter configuration interface is as shown in figure 8, in the embodiment
Multi-segment type temperature control curve be 10 segmentation heating curves, control device 500 is by configuring the design temperature of each time period and steady
Warm time, control Two-way Cycle hot air drying system realize that automatic intelligent runs, without the need for manual control.
The embodiment of the heat-pump-type Two-way Cycle hot air drying system control method of the present invention according to Fig. 6, described
Step S400 includes following control operation action：
S420：If 45 DEG C of design temperature ＜, off-load magnetic valve 12 is closed, enter single cycle conventional heating pattern；This pattern
The aperture of lower interior circulation air-valve 23 is 0%, and the aperture of regulating valve 24 of blowing is 100%；Compressor 1 is controlled according to leaving air temp
Run time interval or running frequency；The temperature control scope of this step the corresponding to 10 segmentation heating curves shown in Fig. 8 the 1st to 5
Section, sets leaving air temp and is respectively 20 DEG C, 25 DEG C, 30 DEG C, 35 DEG C and 40 DEG C.
S440：If design temperature is 65 DEG C of ＜, off-load magnetic valve 12 and second throttle 11 is opened, close first throttle valve
10, enter Two-way Cycle step-down off-load pattern；Air-out is controlled by adjusting the air circulation of air-supply closed circuit and interior circulation loop
Temperature；Under this pattern, the aperture of interior circulation air-valve 23 is 40～60%, and the aperture of regulating valve 24 of blowing is 60～40%；This step
Temperature control scope corresponding to the 6th section and the 7th section of 10 segmentation heating curves shown in Fig. 8, set respectively 50 DEG C of leaving air temp
With 60 DEG C, the aperture of corresponding interior circulation air-valve 23 is respectively 50% and 55%, and the aperture of regulating valve 24 of blowing is respectively 50%
With 45%.
S460：If design temperature >=75 DEG C, S480 is gone to step；Otherwise, off-load magnetic valve 12 and second throttle 11 are opened,
First throttle valve 10 is closed, Two-way Cycle cooling off-load pattern is entered；Followed by adjusting air-supply closed circuit and interior circulation loop
Ring Boiler pressure control leaving air temp；Under this pattern, the aperture of interior circulation air-valve 23 is 55～65%, and the aperture of regulating valve 24 of blowing is
45～35%；The 8th section corresponding to 10 segmentation heating curves shown in Fig. 8 of the temperature control scope of this step, set leaving air temp as
70 DEG C, corresponding interior circulation air-valve 23 is respectively 60% and 40% with the aperture of air-supply regulating valve 24.
S480：Off-load magnetic valve 12 and first throttle valve 10 and second throttle 11 is opened, Two-way Cycle two-way off-load is entered
Pattern；Leaving air temp is controlled by adjusting the air circulation of air-supply closed circuit and interior circulation loop；Circulate in the wind under this pattern
The aperture of valve 23 is 60～80%, and the aperture of regulating valve 24 of blowing is 40～20%.The temperature control scope of this step corresponds to Fig. 8 institutes
The 9th section of the 10 segmentation heating curves for showing and the 10th section, set leaving air temp and be respectively 80 DEG C and 90 DEG C, corresponding circulate in the wind
The aperture of valve 23 is respectively 65% and 75%, and the aperture of regulating valve 24 of blowing is respectively 35% and 25%.
Embodiment 2：
The size of certain tobacco drying room is：8 × 2.8 × 2.2m, first drying tobacco leaf amount are 350 bars, per bar 30kg tobacco leaves, close
Meter 10500kg.Frequency conversion capability-variable heat pump hot air drying system is by one 6 invariable frequency compressor 1-1 and 6 frequency-changeable compressors
1-2 is in parallel to be constituted, and maximum heating capacity 50kW, the frequency conversion varying capacity attachment structure of unit are as shown in Figure 4.The temperature control of flue-cured tobacco process is bent
Line multisection type stoving process figure shown in Figure 9, each period heat consumption are as shown in Figure 10.Described control device 500 leads to
Cross comparative analysis and select suitable operational mode, to reach maximum operational efficiency.
The embodiment of the frequency conversion capability-variable heat pump hot air drying system control method of the present invention according to Fig. 7, described
The step of S300 the demand heat consumption of present period is set according to default temperature control curve dynamic；In the present embodiment.Demand heat dissipation
The heat consumption of amount present period drying room unit interval is represented with the percentage of source pump maximum heating capacity；
Two-shipper transfiguration operational mode of described step S400 according to the demand heat consumption selection system of present period, including
Following control operation action：
S420：If demand heat consumption ＜ 25%, start frequency-changeable compressor 1-2, close the first solenoid valve block 7-1 and the second electricity
Magnet valve group 7-2, enters frequency conversion constant volume pattern；The yellow phase is dried-determined to the temperature control scope of this step corresponding to the tobacco shown in Fig. 9
The first half stage, the 0～10h of baking time in Figure 10, the heat consumption of drying room is 10kw；Frequency-changeable compressor 1-2 is transported with 20Hz frequencies
OK.
S440：If demand heat consumption ＜ 35%, start frequency-changeable compressor 1-2, close the first solenoid valve block 7-1, open the
Two solenoid valve blocks 7-2, enter frequency conversion varying capacity pattern；The temperature control scope of this step dries-fixed Huang corresponding to the tobacco shown in Fig. 9
The rear half stage of phase, the 10～60h of baking time in Figure 10, the heat consumption of drying room is 15kw；Frequency-changeable compressor 1-2 is with 30Hz frequencies
Rate is run.The first stage (fixed Huang phase) is dried in tobacco, it is desirable to which the temperature in drying room is maintained between 35～38 DEG C, now negative
Lotus is relatively small, the demand that can preferably meet the tobacco leaf fixed Huang phase by the pattern.
S460：If demand heat consumption >=70%, goes to step S480；Otherwise, while starting invariable frequency compressor 1-1 and frequency conversion pressure
Contracting machine 1-2, opens the first solenoid valve block 7-1, closes the second solenoid valve block 7-2, enters and determines frequency varying capacity+frequency conversion constant volume parallel connection
Operational mode；The temperature control scope of this step corresponding to the tobacco drying-fixation stage shown in Fig. 9, baking time in Figure 10 60～
80h, the heat consumption of drying room is 15～35kw, and the condenser of invariable frequency compressor 1-1 and evaporator capacity increase, obtain maximum and heat
Amount；Frequency-changeable compressor 1-2 is run with 30～50Hz frequencies.
S480：Simultaneously start invariable frequency compressor 1-1 and frequency-changeable compressor 1-2, close the first solenoid valve block 7-1, open the
Two solenoid valve blocks 7-2, enter and determine frequency constant volume+frequency conversion varying capacity parallel running mode.The temperature control scope of this step corresponds to Fig. 9
Shown tobacco drying-fixation stage and the first half stage of drying muscle stage, the 80～120h of baking time in Figure 10, the heat consumption of drying room
For 35～50kw, leaving air temp will be controlled at 65～68 DEG C, and wet-bulb temperature is controlled at 40～43 DEG C；Require that blade contains through overbaking
The water yield is 5%～6%, vein water content 7%～8%；Frequency-changeable compressor 1-2 is run with 50～100Hz frequencies, maximum load amount
Operating mode under disclosure satisfy that tobacco dry heat demand.Now, invariable frequency compressor 1-1 is as good as with common operation conditions, mainly
Play the effect of increase overall heat exchange amount.Dual system parallel running solve traditional Drying unit be unable to reach high leaving air temp and
Electrically heated drawback need to be introduced, system operation efficiency is greatly improved.
Those of ordinary skill in the art is it should be appreciated that above embodiment is intended merely to illustrate the present invention's
Technical scheme, and be not used as limitation of the invention, any connotation based on the present invention is to embodiment described above
The change made, modification, will all fall in the scope of the claims of the present invention.
Claims (5)
1. a kind of frequency conversion capability-variable heat pump hot air drying system, including source pump, hot blast rack and drying room, is connected to air-heater
Air-supply closed circuit between cabinet and drying room, and for realize hot air drying system microprocessor control control device；Its
It is characterised by：
Described source pump includes invariable frequency compressor and frequency-changeable compressor, and be connected in parallel determines frequency circulation line and frequency conversion circulation
Pipeline, and by the first solenoid valve block and the heat exchanger transfiguration branch road of the second solenoid valve block control connection；
Described determines frequency circulation line from the beginning of the exhaust outlet of invariable frequency compressor, pass sequentially through the first condenser, the first expansion valve,
First evaporimeter and the first gas-liquid separator, return to the air entry of invariable frequency compressor；
Described frequency conversion circulation line from the beginning of the exhaust outlet of frequency-changeable compressor, pass sequentially through the 3rd condenser, the second expansion valve,
3rd evaporimeter and the second gas-liquid separator, return to the air entry of frequency-changeable compressor；
Described heat exchanger transfiguration branch road includes the second condenser and the second evaporimeter, and the second described condenser is by the first electricity
Magnet valve group is parallel-connected to the first condenser, is parallel-connected to the 3rd condenser by the second solenoid valve block；The second described steaming
Send out device and the first evaporimeter is parallel-connected to by the first solenoid valve block, the 3rd evaporation is parallel-connected to by the second solenoid valve block
Device；
Described control device is connected to the first solenoid valve block and the second solenoid valve block, by controlling the first solenoid valve block and second
The opening state of solenoid valve block, changes the connected mode of heat exchanger transfiguration branch road, and control heat pump hot air drying system enters two-shipper
Transfiguration operational mode.
2. frequency conversion capability-variable heat pump hot air drying system according to claim 1, it is characterised in that the hot blast rack bag
Include the basic wind-warm syndrome area and reheating heating zone being separated to form by air-supply regulating valve；The first described condenser and the second condenser
Refrigerant line is connected in series composition double series condenser；First condenser is placed in reheating heating zone as sensible heat condenser,
Second condenser is placed in the inlet side in basic wind-warm syndrome area as latent heat condenser, and the 3rd condenser is placed in the air-out in basic wind-warm syndrome area
Side；Described hot blast rack arranges the interior circulation loop in the basic wind-warm syndrome area of connection；The hot blast of heat pump hot air drying system output, leads to
The secondary heat exchange of interior circulation loop and air-supply closed circuit is crossed, makes leaving air temp can reach 90 DEG C.
3. frequency conversion capability-variable heat pump hot air drying system according to claim 1, it is characterised in that described two-shipper transfiguration
Operational mode include frequency conversion constant volume pattern, frequency conversion varying capacity pattern, determine frequency varying capacity+frequency conversion constant volume parallel running mode,
Frequency conversion constant volume pattern+frequency conversion varying capacity parallel running mode and determine frequency constant volume+frequency conversion varying capacity parallel running mode, its
In：
Frequency conversion constant volume pattern：Frequency-changeable compressor starts, and cold-producing medium is circulated along frequency conversion circulation line, the first solenoid valve block and second
Solenoid valve block is turned off；
Frequency conversion varying capacity pattern：Frequency-changeable compressor starts, and cold-producing medium is circulated along frequency conversion circulation line；First solenoid valve block is closed,
Second solenoid valve block is opened, and described heat exchanger transfiguration branch circuit parallel connection is connected to frequency conversion circulation line, and frequency-changeable compressor is entered and become
Capacity operational mode；
Determine frequency varying capacity+frequency conversion constant volume parallel running mode：Invariable frequency compressor and frequency-changeable compressor start simultaneously, and cold-producing medium is same
When circulate along determine frequency circulation line and frequency conversion circulation line two-way；First solenoid valve block is opened, and the second solenoid valve block is closed, described
Heat exchanger transfiguration branch circuit parallel connection be connected to and determine frequency circulation line, invariable frequency compressor enters varying capacity operational mode；
Determine frequency constant volume+frequency conversion varying capacity parallel running mode：Invariable frequency compressor and frequency-changeable compressor start simultaneously, and cold-producing medium is same
When circulate along determine frequency circulation line and frequency conversion circulation line two-way；First solenoid valve block is closed, and the second solenoid valve block is opened, described
Heat exchanger transfiguration branch circuit parallel connection be connected to frequency conversion circulation line, frequency-changeable compressor enters varying capacity operational mode.
4. the heat pump hot air drying system control of a kind of frequency conversion capability-variable heat pump hot air drying system for described in claim 3
Method, it is characterised in that comprise the following steps：
S100：Configuration temperature control parameter, preserves default temperature control parameter of curve；
S200：Detection leaving air temp and drying room humiture；
S300：According to the demand heat consumption that default temperature control curve dynamic arranges present period；
S400：Demand heat consumption according to present period selects the two-shipper transfiguration operational mode of system.
5. frequency conversion capability-variable heat pump hot air drying system control method according to claim 4, it is characterised in that described
Step S400 includes following control operation action：
S420：If demand heat consumption ＜ 25%, start frequency-changeable compressor, close the first solenoid valve block and the second solenoid valve block, enter
Enter frequency conversion constant volume pattern；
S440：If demand heat consumption ＜ 35%, start frequency-changeable compressor, close the first solenoid valve block, open the second solenoid valve block,
Enter frequency conversion varying capacity pattern；
S460：If demand heat consumption >=70%, goes to step S480；Otherwise, while starting invariable frequency compressor and frequency-changeable compressor, open
The first solenoid valve block is opened, the second solenoid valve block is closed, is entered and is determined frequency varying capacity+frequency conversion constant volume parallel running mode；
S480：Start invariable frequency compressor and frequency-changeable compressor simultaneously, close the first solenoid valve block, open the second solenoid valve block, enter
Enter to determine frequency constant volume+frequency conversion varying capacity parallel running mode.
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| CN107478052A (en) * | 2017-08-25 | 2017-12-15 | 广东芬尼克兹节能设备有限公司 | The control method and device of dryer |
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| CN109405526A (en) * | 2018-11-28 | 2019-03-01 | 江苏天舒电器有限公司 | A kind of control system and method for self-adjustable dehumidifying drying heat pump |
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Denomination of invention: A variable frequency variable capacity heat pump hot air drying system and its control method Effective date of registration: 20230109 Granted publication date: 20220325 Pledgee: Bank of Communications Co.,Ltd. Nantong Branch Pledgor: JIANGSU TENESUN ELECTRICAL APPLIANCE Co.,Ltd. Registration number: Y2023980030591 |