CN206330409U - A kind of frequency conversion capability-variable heat pump hot air drying system - Google Patents
A kind of frequency conversion capability-variable heat pump hot air drying system Download PDFInfo
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Abstract
A kind of frequency conversion capability-variable heat pump hot air drying system, 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, source pump includes invariable frequency compressor and frequency-changeable compressor, determine frequency circulation line and frequency conversion circulation line, and the heat exchanger transfiguration branch road for controlling to connect by the first solenoid valve block and the second solenoid valve block；Heat exchanger transfiguration branch road includes the second condenser and the second evaporator, and the second condenser is parallel-connected to the first condenser by the first solenoid valve block, the 3rd condenser is parallel-connected to by the second solenoid valve block；Second evaporator is parallel-connected to the first evaporator by the first solenoid valve block, and the 3rd evaporator is parallel-connected to by the second solenoid valve block.Determine display system and frequency conversion system parallel running, frequency will be determined and frequency conversion two systems are fully fused together, two-shipper transfiguration operational mode is realized by fixed change combination, meet the temperature change in drying room baking process and energy consumption change is required.
Description
Technical field
The utility model is related to supply or the control device of the air or gas of drying solid material or product, especially relates to
And a kind of heat-pump-type hot air drying system.
Background technology
Need the place of hot-air seasoning more and more in the market, such as tobacco drying, grain heat-drying, medicinal material drying, fruit
The drying such as vegetable drying place, drying is mainly dried with coal stove, steam stove, electric furnace.Coal, gas are all non-renewable strategic performances
Source, is not the direction that country promotes, and electric furnace is high because of the big, operating cost that consumes energy, and is also not suitable for carrying out batch popularization.Northern country
All it is that heating is carried out with coal stove manufacture hot water before heating, country is popularized in an all-round way to rural area using heat pump instead of coal stove, it was demonstrated that
Heat pump still has very big market prospects in terms of heating.Heat pump also has very big hair in the place of above-mentioned hot-air seasoning demand
Open up 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 is some improve to transform, but still without departing from traditional form.China is introduced with fuel oil, fire coal directly from 1990s
Heat supply and the dense drying equipment of boiler heat supplying, in various regions, 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 cost is higher, and 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 is low, and coal consumption is high, generally dries 1kg tobacco leaves coal consumption and marks coal in 1.5~2.5kg,
Environmental pollution is serious.A kind of Chinese invention patent " tobacco baking room using air source heat pump as thermal source " (patent of invention number：
200910044468.X, Authorization Notice No.：CN101940358B a kind of tobacco using air source heat pump as thermal source) is disclosed to bake
Moisture exhausting port is provided with above room, including the heating chamber provided with fresh wind port and the hothouse provided with temperature, moisture probe, barn, is also wrapped
Include air source heat pump and condenser fan, the span of the ratio of condenser heat exchange area and compressor power input is in 7-
Between 15m2/kw, condenser and its air draught type breeze fan device are in the heating chamber；The hothouse and/or heating chamber
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
Obtained great expansion with the application of solar energy, production 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, has positive effect to saving the energy, environmental protection.But, in the Roaster of tobacco
In terms of skill, " double low " baking process of five-part form, seven segmentations and six segmentations etc. has been researched and proposed in various regions in succession.Every kind of baking process
Tobacco flue-curing overall process is all divided into changing yellow stage, fixation stage, drying muscle stage, clear and definite humiture, which refers to, all have been provided to each period
Mark, the multisection type stoving process figure of part kind tobacco shown in Figure 9.Because the division of baking process paragraph is more thin, especially
It is tobacco leaf change is divided more than level and obscure, non-quantitative, without simple clearly key point, technical sophistication, be 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 another problem that heat-pump-type hot air drying system needs to solve 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, are arranged at back
Circulating fan in air channel, the exhausting duct connected with air -return duct is arranged at the air exhauster of the passway of exhausting duct, is 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 used
Two sets or more than two sets source pump parallel operations, at drying operation process initial stage by the low-grade surrounding air heat pair of absorption
Drying room carries out heater riser temperature, and heating dehumidifies to the hot and humid air discharged in drying room afterwards to a certain extent, to it
In contained sensible heat and latent heat carry out maximized reclaim.The system utilizes the cycle fluid temperature range of two sets of source pumps
Difference higher wind pushing temperature relatively is provided, while ensureing that the evaporating temperature of Drying unit is fully improved.But, the existing skill
Art scheme is using 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 become big, or even the quality of finished product can be influenceed because drying temperature change is excessive.
Utility model content
The purpose of this utility model is to provide for a kind of frequency conversion capability-variable heat pump hot air drying system, for solving existing heat
Pump hot air drying system provides the technical problem existed during high-temperature hot-air.
The utility model solves the technical scheme that is used 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, and be connected to
Air-supply circulation loop between hot blast rack and drying room, it is characterised in that：
Described source pump includes invariable frequency compressor and frequency-changeable compressor, and what is be connected in parallel determines frequency circulation line and frequency conversion
Circulation line, and the heat exchanger transfiguration branch road for controlling to connect by the first solenoid valve block and the second solenoid valve block；
Described determines frequency circulation line since the exhaust outlet of invariable frequency compressor, passes sequentially through the first condenser, first swollen
Swollen valve, the first evaporator 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 since the exhaust outlet of frequency-changeable compressor
Swollen valve, the 3rd evaporator 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 evaporator, and described the second condenser passes through the
One solenoid valve block is parallel-connected to the first condenser, and the 3rd condenser is parallel-connected to by the second solenoid valve block；Described
Two evaporators are parallel-connected to the first evaporator by the first solenoid valve block, and the 3rd steaming is parallel-connected to by the second solenoid valve block
Send out device.
A kind of preferably technical scheme of frequency conversion capability-variable heat pump hot air drying system of the present utility model, it is characterised in that
The 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
Composition double series condenser is connected in series with the refrigerant line of the second condenser；First condenser is put as sensible heat condenser
In reheating heating zone, the 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 base
The air side in plinth wind-warm syndrome area；Described hot blast rack sets the interior circulation loop in the basic wind-warm syndrome area of connection；Heat pump hot-air seasoning system
The hot blast of system output, by interior circulation loop and the secondary heat exchange of air-supply circulation loop, makes leaving air temp can reach 90 DEG C.
A kind of superior technique scheme of frequency conversion capability-variable heat pump hot air drying system of the present utility model, it is characterised in that
Described two-shipper transfiguration operational mode includes frequency conversion constant volume pattern, frequency conversion varying capacity pattern, determines frequency varying capacity+frequency conversion constant volume
Parallel running mode, frequency conversion constant volume pattern+frequency conversion varying capacity parallel running mode and to determine frequency constant volume+frequency conversion varying capacity in parallel
Operational mode, wherein：
Frequency conversion constant volume pattern：Frequency-changeable compressor start, refrigerant 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 refrigerant 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 enters
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
Agent is circulated along determining frequency circulation line and frequency conversion circulation line two-way simultaneously；First solenoid valve block is opened, and the second solenoid valve block is closed,
Described heat exchanger transfiguration branch circuit parallel connection, which 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
Agent is circulated along determining frequency circulation line and frequency conversion circulation line two-way simultaneously；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.
The beneficial effects of the utility model are：
1st, frequency conversion capability-variable heat pump hot air drying system of the present utility model, by will determine display system and frequency conversion system it is in parallel
Operation, will determine frequency and frequency conversion two systems is fully fused together, and realizes two-shipper transfiguration operational mode by fixed change combination, meets
Temperature change and energy consumption change in drying room baking process are required；Secondary heat exchange is realized by setting interior circulation loop, makes hot blast
The leaving air temp of rack can reach 90 DEG C.
2nd, frequency conversion capability-variable heat pump hot air drying system of the present utility model, by using transfiguration in evaporation side and condensation side
Amount technology, in frequency conversion system during height frequency reasonable distribution evaporator and condenser heat exchange area, both can guarantee that product
Reliability, can reach raising unit efficiency, reduce the purpose of energy resource consumption again.
3rd, frequency conversion capability-variable heat pump hot air drying system of the present utility model, temperature control curve dynamic is preset according to drying room technique
Setting demand heat consumption, according to present period demand heat consumption select system operational mode, meet temperature in baking process,
The high-precision control requirement of humidity.
Brief 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 is the first condenser, and 2-2 is the second condenser, and 2-3 is the 3rd condenser, and 21 be latent heat condenser, and 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 be evaporator, and 4-1 is the first evaporator, and 4-2 is the second evaporator, 4-3
It is vapour liquid separator for the 3rd evaporator, 5,5-1 is the first gas-liquid separator, and 5-2 is the second gas-liquid separator, and 6 be evaporator
Blower fan, 7-1 is the first solenoid valve block, and 7-2 is the second solenoid valve block, and 8 be pressure fan, and 10 be first throttle valve, and 11 be second section
Valve is flowed, 12 be off-load magnetic valve, and 23 be interior circulation air-valve, and 24 be air-supply regulating valve, and 100 be source pump, and 200 be air-heater
Cabinet, 210 be supply air duct, and 220 be interior circulation air channel, and 230 be return airway, and 400 be drying room, and 500 be control device, and 510 are
Operating parameter setting module, 520 be drying room temperature and humidity monitor module, and 521 be dry-bulb temperature sensor, and 522 be that wet-bulb temperature is passed
Sensor, 530 be wind pushing temperature monitoring module, and 531 be leaving air temp sensor, and 540 be valve area controller, and 550 be heat pump
Generator set controller.
Embodiment
For better understanding of above-mentioned technical proposal of the present utility model, traveling one is entered with reference to the accompanying drawings and examples
It is described in detail on step ground.Fig. 1 is one embodiment of heat-pump-type Two-way Cycle hot air drying system of the present utility model, including heat pump machine
Group 100, hot blast rack 200 and drying room 400, and for realizing the control device 500 of hot air drying system microprocessor control；
As shown in figure 1, what described heat-pump-type Two-way Cycle hot air drying system was also constituted including air-supply circulation loop and interior circulation loop
Hot blast double circulation loop；
The air-supply regulating valve 24 that the inside of the hot blast rack 200 is set, based on hot blast rack 200 is separated wind-warm syndrome area and
Reheating heating zone；
It is placed in the latent heat condenser 21 in basic wind-warm syndrome area and is placed in the sensible heat condenser 22 of reheating heating zone, passes through heat pump machine
The refrigerant line of group 100 is connected in series composition double series condenser；The high temperature liquid refrigerant of compressor discharge, first sends into
Latent heat condenser 21 is re-fed into after the heat exchange cooling of sensible heat condenser 22；
Described air-supply circulation loop 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, and the sensible heat of reheating heating zone is then reached through regulating valve 24 of blowing
Condenser 22, drying room 400 is sent into finally by supply air duct 210；
Described interior circulation loop enters interior circulation air channel 220, Ran Houjing from the exhaust outlet of pressure fan 8 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；Enter the air-flow in basic wind-warm syndrome area from drying room 400, a part is transmitted back to return airway by interior circulation air channel 220
230, latent heat condenser 21 is sent to after being mixed with drying room return air, the interior circulation loop of Wind Volume circulation is formed, 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 small wind
Measure the air-supply circulation loop of circulation.Latent heat in refrigerant 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 fully absorbing the condensation latent heat of refrigerant；Compressor discharge temperature is up to 130
DEG C gaseous refrigerant in sensible heat, through the secondary heat exchange of sensible heat condenser 22 be transferred to air-supply circulation loop small 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 by controlling interior circulation air-valve 23 and the aperture of air-supply regulating valve 24, and regulation air-supply is followed
Loop back path and the air circulation in interior circulation loop, the leaving air temp of control hot blast rack 200.
The embodiment of the source pump of heat-pump-type Two-way Cycle hot air drying system of the present utility model according to Fig. 2,
Described source pump 100 includes the major cycle pipeline of refrigerant and is connected to the two-way off-load branch road of major cycle pipeline；It is described
Major cycle pipeline since the exhaust outlet of compressor 1, pass sequentially through sensible heat condenser 22, latent heat condenser 21, expansion valve 3,
Evaporator 4 and vapour liquid separator 5, return to the air entry of compressor 1；Described two-way off-load branch route off-load magnetic valve 12, the
One choke valve 10 and the connection composition of second throttle 11：The entrance of the off-load magnetic valve 12 is parallel-connected to latent heat condenser 21
Refrigerant pipe way outlet, the entrance of the first throttle valve 10 and second throttle 11 is parallel-connected to off-load magnetic valve 12
Outlet, the outlet of the first throttle valve 10 is connected to the entrance of evaporator 4, and the outlet of the second throttle 11 is connected to vapour
The entrance of liquid/gas separator 5；Described control device 500 is connected to first throttle valve 10, second throttle 11 and off-load magnetic valve
12, dynamically change the refrigerant circulation line of source pump according to leaving air temp, compressor 1 is reduced by two-way off-load branch road
Delivery temperature and high side pressure, realize the Two-way Cycle dynamic operational of hot air drying system.
According to one embodiment of heat-pump-type Two-way Cycle hot air drying system of the present utility model, described Two-way Cycle dynamic
Operational mode 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 is closed, and refrigerant is circulated along major cycle pipeline；Interior circulation air-valve
23 apertures 0%, the aperture 100% of regulating valve 24 of blowing, described Two-way Cycle hot air drying system is produced by circulation loop of blowing
Leaving air temp is less than 45 DEG C of low temperature hot blast；Described control device 500 is by changing run time interval or the fortune of compressor 1
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
Cryogen along major cycle pipeline while being circulated, and a part is shunted through off-load magnetic valve 12 and directly entered by second throttle 11
Enter vapour liquid separator 5, to reduce high side pressure；The aperture 50% to 55% of interior circulation air-valve 23, the aperture of regulating valve 24 of blowing
50% to 45%；Described control device 500 is controlled out by adjusting the air circulation of air-supply circulation loop 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
Cryogen along major cycle pipeline while being circulated, and a part is shunted through off-load magnetic valve 12 and by parallel with expansion valve 3 the
One choke valve 10 enters evaporator 4, to reduce delivery temperature；The aperture 55% to 65% of interior circulation air-valve 23, regulating valve 24 of blowing
Aperture 45% to 35%；The air circulation control that described control device 500 passes through regulation air-supply circulation loop 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, refrigerant
While being circulated along major cycle pipeline, shunted through off-load magnetic valve 12, refrigerant after a shunting part by with expansion valve 3
First throttle valve 10 in parallel enters evaporator 4, and another part is directly entered vapour liquid separator 5 by second throttle 11；It is interior
The aperture 65% to 75% of air-valve 23 is circulated, the aperture 35% to 25% of regulating valve 24 of blowing；Described control device 500 passes through regulation
Air-supply circulation loop and the air circulation in interior circulation loop control leaving air temp, produce 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 heat pump hot air drying system of the present utility model, described source pump 100 is also included using change
The second refrigerant circulation line of frequency compressor；The 3rd condenser 2-3 being connected in second refrigerant circulation line is arranged on
In hot blast 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,
Invariable frequency compressor stops, and frequency-changeable compressor starts, and heat pump hot air drying system is run with conventional inverter heat pump mode；When drying room
During demand heat consumption >=40%, invariable frequency compressor and frequency-changeable compressor start simultaneously, and heat pump hot air drying system is to determine frequency+frequency conversion
Double parallel mode operation；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
Mode operation, described latent heat condenser 21, the 3rd condenser 2-3 and sensible heat condenser 22 forms the three-level of hot blast rack 200
Heat exchange structure；The circulating current in interior circulation loop is exchanged heat twice by the condenser 2-3 of latent heat condenser 21 and the 3rd, is further carried
The basic wind-warm syndrome in higher baseline wind-warm syndrome area, makes the leaving air temp of hot blast rack 200 bring up to more than 75 DEG C.
One embodiment such as Fig. 4 institutes of the source pump of frequency conversion capability-variable heat pump hot air drying system of the present utility model
Show, described source pump 100 includes invariable frequency compressor 1-1 and frequency-changeable compressor 1-2, be connected in parallel determine frequency circulation line and
Frequency conversion circulation line, and the heat exchanger transfiguration branch for controlling to connect by the first solenoid valve block 7-1 and the second solenoid valve block 7-2
Road；
Described determines frequency circulation line since invariable frequency compressor 1-1 exhaust outlet, pass sequentially through the first condenser 2-1,
First expansion valve 3-1, the first evaporator 4-1 and the first gas-liquid separator 5-1, return to invariable frequency compressor 1-1 air entry；
Described frequency conversion circulation line since frequency-changeable compressor 1-2 exhaust outlet, pass sequentially through the 3rd condenser 2-3,
Second expansion valve 3-2, the 3rd evaporator 4-3 and the second gas-liquid separator 5-2, return to frequency-changeable compressor 1-2 air entry；
Described heat exchanger transfiguration branch road includes the second condenser 2-2 and the second evaporator 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, and is parallel-connected to by the second solenoid valve block 7-2
Three condenser 2-3；The second described evaporator 4-2 is parallel-connected to the first evaporator 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 evaporator 4-3；
Described control device 500 is connected to the first solenoid valve block 7-1 and the second solenoid valve block 7-2, passes through control first
Solenoid valve block 7-1 and the second solenoid valve block 7-2 opening state, 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
Contracting machine 1-2 running frequency；Frequency conversion capability-variable heat pump hot air drying system of the present utility model, is expanded by varying capacity operational mode
The heat exchange area of big heat exchanger (including evaporator and condenser), can significantly improve the overall heat exchange effect of source pump 100,
Improve system energy efficiency.
According to one embodiment of frequency conversion capability-variable heat pump hot air drying system of the present utility model, described two-shipper transfiguration
Operational mode includes frequency conversion constant volume pattern, and frequency conversion varying capacity pattern determines 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 refrigerant is circulated along frequency conversion circulation line, the first magnetic valve
Group 7-1 and the second solenoid valve block 7-2 is turned off；
Frequency conversion varying capacity pattern：Frequency-changeable compressor 1-2 starts, and refrigerant 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 are opened simultaneously
Dynamic, refrigerant is simultaneously along determining frequency circulation line and frequency conversion circulation line two-way is circulated；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, which is connected to, determines frequency circulation line, and invariable frequency compressor 1-1, which enters, to be 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 are opened simultaneously
Dynamic, refrigerant is simultaneously along determining frequency circulation line and frequency conversion circulation line two-way is circulated；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, which enters, to be 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
Second condenser 2-2 refrigerant line 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 sets 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 circulation loop, makes heat
The leaving air temp of fan cabinet 200 can reach 90 DEG C.
One embodiment such as Fig. 5 of the control device 500 of frequency conversion capability-variable heat pump hot air drying system of the present utility model
It is shown, including for configuring temperature control parameter and preserving the operating parameter setting module 510 of default temperature control parameter of curve, be used for
Detection and the drying room temperature and humidity monitor module 520 and wind pushing temperature monitoring module 530 of monitoring leaving air temp and drying room humiture, are used
In the valve area controller 540 of driving air-valve, and for controlling the source pump controller 550 of compressor and magnetic valve；
The input of the drying room temperature and humidity monitor module 520, is connected to operating parameter setting module 510, dry-bulb temperature sensor 521
With wet bulb temperature sensor 522；The output end of the drying room temperature and humidity monitor module 520 is connected to source pump controller 550；
The output end of source pump controller 550 is connected to the control magnetic valve in compressor and refrigerant line；The wind pushing temperature
The input of monitoring module 530, is connected to operating parameter setting module 510 and leaving air temp sensor 531；The wind pushing temperature
The output end of monitoring module 530 is connected to valve area controller 540, in the output end of valve area controller 540 is connected to
Circulate air-valve 23 and air-supply regulating valve 24.Described control magnetic valve includes the off-load magnetic valve being connected in refrigerant line
12nd, first throttle 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 frequency conversion capability-variable heat pump hot air drying system of the present utility model, described control device
500 realize programme-control using the chip microprocessor with multi-channel A/D translation interfaces and multi-channel PWM output interface, described
Operating parameter setting module 510, drying room temperature and humidity monitor module 520 and wind pushing temperature monitoring module 530 are that microprocessor is provided
Software function module；Described dry-bulb temperature sensor 521, leaving air temp sensor 531 and wet bulb temperature sensor 522 is logical
The A/D translation interfaces for crossing microprocessor are connected to chip microprocessor；Described control device 500 utilizes the PWM of microprocessor
Output, is that valve area controller 540 provides valve area control output signal, and carried by source pump controller 550
For the VFC output signal of frequency-changeable compressor and frequency conversion fan；Described control device 500 utilizes the PIO ends of microprocessor
The switch output signal of mouth programming output solenoid valve and compressor, by source pump controller 550 to the compressor in system
Switch control is performed with magnetic valve.
Fig. 6 is one embodiment of heat-pump-type Two-way Cycle hot air drying system control method of the present utility model, including with
Lower step：
S100：Temperature control parameter is configured, default temperature control parameter of curve is preserved；
S200：Detect leaving air temp and drying room humiture；
S300：Design temperature is dynamically adjusted according to default temperature control curve；
S400：The Two-way Cycle dynamic operational of system is selected according to current design temperature.
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 period and steady
Warm time, control Two-way Cycle hot air drying system realizes that automatic intelligent is run, without manual control.
The embodiment of heat-pump-type Two-way Cycle hot air drying system control method of the present utility model according to Fig. 6, institute
The step S400 stated is acted including following control operation：
S420：If 45 DEG C of design temperature ＜, off-load magnetic valve 12 is closed, into single cycle conventional heating pattern；This pattern
The aperture of lower interior circulation air-valve 23 is 0%, and the aperture of air-supply regulating valve 24 is 100%；Compressor 1 is controlled according to leaving air temp
Run time interval or running frequency；The temperature control scope of this step corresponds to the 1st to 5 of 10 segmentation heating curves shown in Fig. 8
Section, setting leaving air temp 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 are opened, first throttle valve is closed
10, it is depressured off-load pattern into Two-way Cycle；Air-out is controlled by the air circulation for adjusting air-supply circulation loop and interior circulation loop
Temperature；The aperture of interior circulation air-valve 23 is 40~60% under this pattern, and the aperture of air-supply regulating valve 24 is 60~40%；This step
Temperature control scope correspond to the 6th section and the 7th section of 10 segmentation heating curves shown in Fig. 8, it is respectively 50 DEG C to set 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 air-supply regulating valve 24 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, into Two-way Cycle cooling off-load pattern；Followed by adjusting air-supply circulation loop and interior circulation loop
Ring Boiler pressure control leaving air temp；The aperture of interior circulation air-valve 23 is 55~65% under this pattern, and the aperture of air-supply regulating valve 24 is
45~35%；The temperature control scope of this step corresponds to the 8th section of 10 segmentation heating curves shown in Fig. 8, set leaving air temp as
70 DEG C, corresponding interior circulation air-valve 23 and the aperture of air-supply regulating valve 24 are respectively 60% and 40%.
S480：Off-load magnetic valve 12 and first throttle valve 10 and second throttle 11 are opened, into Two-way Cycle two-way off-load
Pattern；Leaving air temp is controlled by the air circulation for adjusting air-supply circulation loop and interior circulation loop；Circulate in the wind under this pattern
The aperture of valve 23 is 60~80%, and the aperture of air-supply regulating valve 24 is 40~20%.The temperature control scope of this step corresponds to Fig. 8 institutes
The 9th section and the 10th section of the 10 segmentation heating curves shown, setting leaving air temp is 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 air-supply regulating valve 24 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 is 350 bars, per bar 30kg tobacco leaves, is closed
Count 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 parallel connections are constituted, and maximum heating capacity 50kW, the frequency conversion varying capacity attachment structure of unit is 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 is 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 frequency conversion capability-variable heat pump hot air drying system control method of the present utility model according to Fig. 7,
Described step S300 dynamically sets the demand heat consumption of present period according to default temperature control curve；In the present embodiment.Demand
Heat consumption is represented with the percentage of the heat consumption and the maximum heating capacity of source pump of present period drying room unit interval；
Described step S400 selects the two-shipper transfiguration operational mode of system according to the demand heat consumption of present period, including
Following control operation action：
S420：If demand heat consumption ＜ 25%, start frequency-changeable compressor 1-2, close the electricity of the first solenoid valve block 7-1 and second
Magnet valve group 7-2, into frequency conversion constant volume pattern；The temperature control scope of this step corresponds to tobacco drying-fixed yellow phase shown in Fig. 9
0~10h of baking time in first half stage, 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 block 7-2, into frequency conversion varying capacity pattern；The temperature control scope of this step corresponds to tobacco drying-fixed Huang shown in Fig. 9
10~60h of baking time in the rear half stage of phase, Figure 10, the heat consumption of drying room is 15kw；Frequency-changeable compressor 1-2 with 30Hz frequently
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, and the demand of tobacco leaf fixed yellow phase can be preferably met 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, in parallel into frequency varying capacity+frequency conversion constant volume is determined
Operational mode；The baking time 60 that the temperature control scope of this step corresponds in tobacco drying-fixation stage shown in Fig. 9, Figure 10~
80h, the heat consumption of drying room is 15~35kw, and invariable frequency compressor 1-1 condenser and evaporator capacity are increased, and are obtained maximum and are heated
Amount；Frequency-changeable compressor 1-2 is run with 30~50Hz frequencies.
S480：Start invariable frequency compressor 1-1 and frequency-changeable compressor 1-2 simultaneously, close the first solenoid valve block 7-1, open the
Two solenoid valve block 7-2, into determining frequency constant volume+frequency conversion varying capacity parallel running mode.The temperature control scope of this step corresponds to Fig. 9
80~120h of baking time in shown tobacco drying-fixation stage and the first half stage of drying muscle stage, 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
Water 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 drying 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 the embodiment of the above is intended merely to illustrate that this practicality is new
The technical scheme of type, and be not used as it is of the present utility model limit, it is any based on connotation of the present utility model to
Change, modification that the embodiment is made are gone up, will all be fallen in scope of the claims of the present utility model.
Claims (3)
1. a kind of frequency conversion capability-variable heat pump hot air drying system, including source pump, hot blast rack and drying room, and it is connected to heat
Air-supply circulation loop between fan cabinet and drying room；It is characterized in that：
Described source pump includes invariable frequency compressor and frequency-changeable compressor, and what is be connected in parallel determines frequency circulation line and frequency conversion circulation
Pipeline, and the heat exchanger transfiguration branch road for controlling to connect by the first solenoid valve block and the second solenoid valve block；
Described determines frequency circulation line since the exhaust outlet of invariable frequency compressor, pass sequentially through the first condenser, the first expansion valve,
First evaporator and the first gas-liquid separator, return to the air entry of invariable frequency compressor；
Described frequency conversion circulation line since the exhaust outlet of frequency-changeable compressor, pass sequentially through the 3rd condenser, the second expansion valve,
3rd evaporator 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 evaporator, and the second described condenser passes through the first electricity
Magnet valve group is parallel-connected to the first condenser, and the 3rd condenser is parallel-connected to by the second solenoid valve block；Described second is steamed
Hair device is parallel-connected to the first evaporator by the first solenoid valve block, and the 3rd evaporation is parallel-connected to by the second solenoid valve block
Device.
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 being separated to form by air-supply regulating valve and reheating heating zone；Described the first 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 sets 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 circulation loop is crossed, leaving air temp is 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 refrigerant 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 refrigerant 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, which enters, to be 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 refrigerant is same
When circulate along determining 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 refrigerant is same
When circulate along determining 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621387051.5U CN206330409U (en) | 2016-12-16 | 2016-12-16 | A kind of frequency conversion capability-variable heat pump hot air drying system |
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|---|---|---|---|
| CN201621387051.5U CN206330409U (en) | 2016-12-16 | 2016-12-16 | A kind of frequency conversion capability-variable heat pump hot air drying system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106500495A (en) * | 2016-12-16 | 2017-03-15 | 江苏天舒电器股份有限公司 | A kind of frequency conversion capability-variable heat pump hot air drying system and its control method |
| CN112833579A (en) * | 2021-01-22 | 2021-05-25 | 郑州大学 | Multi-mode heat pump tobacco curing system and control method thereof |
-
2016
- 2016-12-16 CN CN201621387051.5U patent/CN206330409U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106500495A (en) * | 2016-12-16 | 2017-03-15 | 江苏天舒电器股份有限公司 | A kind of frequency conversion capability-variable heat pump hot air drying system and its control method |
| CN106500495B (en) * | 2016-12-16 | 2022-03-25 | 江苏天舒电器股份有限公司 | Variable-frequency variable-capacity heat pump hot air drying system and control method thereof |
| CN112833579A (en) * | 2021-01-22 | 2021-05-25 | 郑州大学 | Multi-mode heat pump tobacco curing system and control method thereof |
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