CN112856950A - Efficient energy-saving heat pump drying system capable of heating in stages - Google Patents
Efficient energy-saving heat pump drying system capable of heating in stages Download PDFInfo
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- CN112856950A CN112856950A CN202110075709.8A CN202110075709A CN112856950A CN 112856950 A CN112856950 A CN 112856950A CN 202110075709 A CN202110075709 A CN 202110075709A CN 112856950 A CN112856950 A CN 112856950A
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- 238000001035 drying Methods 0.000 title claims abstract description 185
- 238000010438 heat treatment Methods 0.000 title claims abstract description 23
- 239000003507 refrigerant Substances 0.000 claims description 15
- 230000009471 action Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 6
- 238000003303 reheating Methods 0.000 claims description 4
- 240000001008 Dimocarpus longan Species 0.000 description 8
- 235000000235 Euphoria longan Nutrition 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 208000012826 adjustment disease Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/02—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in buildings
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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
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/08—Parts thereof
- F26B25/12—Walls or sides; Doors
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a high-efficiency energy-saving heat pump drying system with graded heating, which comprises a first system, a second system, a first drying room and a second drying room, wherein a first evaporator is arranged in the first drying room, and a second evaporator is arranged in the second drying room; an intermediate heat exchanger is communicated with a pipeline between the first electronic expansion valve and the first evaporator; the other side of the intermediate heat exchanger is communicated with a pipeline between the second condenser and the second electronic expansion valve; an air duct door A, an air duct door B and an air duct door E are arranged on the first drying room, and an air duct is arranged between the air duct door A and the air duct door E; an opening is arranged near the air duct door A of the air duct and communicated with the air duct door C through two air ducts; be equipped with wind channel door C, wind channel door D and wind channel door F on No. two stoving rooms, be equipped with three wind channels between wind channel door F and the wind channel door H, be equipped with four wind channels between wind channel door D and the wind channel door J, a condenser sets up in a wind channel, and No. two condensers set up in four wind channels.
Description
Technical Field
The invention relates to the field of air energy heat pump drying, in particular to a high-efficiency energy-saving heat pump drying system with graded heating.
Background
The heat pump drying is efficient, energy-saving, green and environment-friendly, and has a huge development prospect, and in addition, China is a big agricultural country, and agricultural products needing drying are very many, and the market demand is very large. The heat pump drying develops rapidly in two years, but the efficiency and the technology do not meet ideal requirements, so that the drying efficiency is low, the control is unstable, drying failure accidents occur, and the loss is huge. Therefore, in order to ensure the drying efficiency and safety, a high-efficiency energy-saving double-stage heating drying system is developed, the drying efficiency is improved, and the product quality is ensured. The system is stable in control and safer in product drying.
Disclosure of Invention
The invention aims to provide a heat pump drying system with high efficiency, energy conservation and graded heating.
The purpose of the invention can be realized by the following technical scheme:
a high-efficiency energy-saving heat pump drying system with staged heating comprises a first system, a second system, a first drying room and a second drying room, wherein the first system comprises a first compressor, a first four-way valve, a first condenser, a first air channel, a first electronic expansion valve, a first evaporator and a first condensing fan, and the first evaporator is arranged in the first drying room; the second system comprises a second compressor, a second four-way valve, a second condenser, a second air channel, a second electronic expansion valve, a second evaporator and a second condensing fan, wherein the second evaporator is positioned in the second drying room; an intermediate heat exchanger is communicated with a pipeline between the first electronic expansion valve and the first evaporator; the other side of the intermediate heat exchanger is communicated with a pipeline between the second condenser and the second electronic expansion valve; an air duct door A, an air duct door B and an air duct door E are arranged on the first drying room, and an air duct is arranged between the air duct door A and the air duct door E; an opening is arranged near the air duct door A of the air duct and communicated with the air duct door C through two air ducts; an air duct door G and an air duct door H are arranged on the air duct, and an air duct door I is arranged in the air duct; an air duct door C, an air duct door D and an air duct door F are arranged on the second drying room, three air ducts are arranged between the air duct door F and the air duct door H, an air duct door J is arranged on the three air ducts, four air ducts are arranged between the air duct door D and the air duct door J, a normally open door M and a normally open door N are arranged on the four air ducts, five air ducts are arranged between the air duct door B and the normally open door M, and six air ducts are arranged between the air duct door G and the normally open door N; the first condenser is arranged in one air duct, and the second condenser is arranged in the four air ducts.
Preferably, the operation method of the drying system is as follows: the second compressor conveys high-temperature gaseous refrigerant to the second condenser, the second condensing fan conveys hot air into the second drying room through the four air channels, the temperature in the second drying room is kept at 30-50 ℃, the air channel door D is opened at the moment, and the air channel door C is closed; then the refrigerant passes through the electronic expansion valve to the intermediate heat exchanger, passes through the second evaporator and returns to the suction port of the second compressor.
Preferably, one side of the intermediate heat exchanger is a low-temperature liquid refrigerant behind the first electronic expansion valve, the other side of the intermediate heat exchanger is a high-temperature and high-pressure liquid refrigerant of the second system, when the intermediate heat exchanger works, the first system absorbs heat from the second system to cause the return air of the first system to rise, the high-temperature refrigerant of the second system is used for improving the superheat degree of the first system, so that the exhaust temperature is improved, the air duct door A, D is opened, and the air duct door B, C is closed, so that the first drying room belongs to a high-temperature drying area, the second drying room belongs to a normal-temperature drying area, and the exhaust temperature is higher than that of the second system due to the suction superheat of the first system, so that the first condensing fan blows out high-temperature gas, and the second condensing fan blows out normal-temperature gas to different drying rooms, and a stage heating state is.
Preferably, the operation method of the drying system is as follows: when the drying is started, the first system is started firstly, the air duct door A, D, I, J is opened, the air duct door B, C, G, H is closed, the air of the first system is heated by the first condenser and then is delivered to the air duct door A under the action of the first condensing fan to enter the first drying room, the air duct door B is closed at the moment, and the second system is in a standby state; at the moment, the dried articles are heated by hot air, then the heated articles reach the first evaporator for heat recovery and then enter the air duct door E, and then the heated articles return to the first condensing fan through the air duct for reheating.
Preferably, when the stoving room reaches the condition, No. two systems start this moment, and wind channel door A, D, I, J keeps opening, and wind channel door B, C, G, H closes, and the wind of No. two systems is earlier after No. two condenser heats this moment, send under No. two condensation fan's effect to D mouth, get into No. two stoving rooms, and hot-blast article to being dried are heated this moment, and the entering wind channel door F after reaching No. two evaporimeters again and carrying out heat recovery, then get back to No. two condensation fan through four wind channels and heat again.
Preferably, when the first drying room meets the high-temperature exit condition and the second system meets the normal-temperature drying condition, the air duct door A, D, I, J is closed, the air duct door B, C, G, H is opened, air of the first system reaches the air duct door G through the opening E, reaches the four air ducts through the six air ducts, reaches the air duct door B through the second condenser along the five air ducts, and then the first drying room is dried at normal temperature; the air of the second system reaches the air duct door H through the air duct door F, reaches the air duct door C along the second air duct through the first air duct to the first condenser, and then the second drying room is dried at high temperature.
The invention has the beneficial effects that:
the heat pump drying system with high efficiency, energy conservation and graded heating is composed of two heat systems which are connected in parallel and two drying rooms, and when the heat pump drying system works, one high-temperature drying room and one normal-temperature drying room are used for drying, so that a heat source is fully utilized; the drying efficiency is improved by two-stage heating, the product is preheated at normal temperature, and the quality of the product is prevented from changing due to large temperature change; the system is stable in control and safer in product drying.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
the invention will be further described with reference to the accompanying drawings.
Fig. 1 is a structural block diagram of a heat pump drying system with high efficiency, energy saving and graded heating of the invention.
The following are the labels of the attached drawings in the high-efficiency energy-saving and staged heating heat pump drying system, and the product can be clearly understood through the description of the attached drawings and the corresponding labels.
1. A first compressor; 2. a first four-way valve; 3. a first condenser; 4. a first air duct; 5. a first electronic expansion valve; 6. an intermediate heat exchanger; 7. a first drying room; 8. an evaporator No. one; 9. a second compressor; 10. a second condenser; 11. two air ducts; 12. a second electronic expansion valve; 13. a second evaporator; 14. a second drying room; 15. a first condensing fan; 16. a second condensing fan; 17. an air duct; 18. three air ducts; 19. six air ducts; 20. a five-air duct; 21. and two air ducts.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a high-efficiency energy-saving heat pump drying system with staged heating comprises a first system, a second system, a first drying room 7 and a second drying room 14, wherein the first system comprises a first compressor 1, a first four-way valve 2, a first condenser 3, a first air duct 4, a first electronic expansion valve 5, a first evaporator 8 and a first condensing fan 15, and the first evaporator 8 is arranged in the first drying room 7; the second system comprises a second compressor 9, a second four-way valve, a second condenser 10, a second air channel 11, a second electronic expansion valve 12, a second evaporator 13 and a second condensing fan 16, wherein the second evaporator 13 is positioned in a second drying room 14; an intermediate heat exchanger 6 is communicated with a pipeline between the first electronic expansion valve 5 and the first evaporator 8; the other side of the intermediate heat exchanger 6 is communicated with a pipeline between a second condenser 10 and a second electronic expansion valve 12; a compressor 1 is connected with a four-way valve 2, the four-way valve 2 is connected with one end of a condenser 3, the other end of the condenser 3 is connected with an electronic expansion valve 5, the electronic expansion valve 5 is connected with an intermediate heat exchanger 6, the other end of the intermediate heat exchanger 6 is connected with one end of an evaporator 8, the other end of the evaporator 8 is connected with the four-way valve 2, and one end of the four-way valve 2 is connected with the other end of the compressor 1. No. two compressors 9 are connected with a No. two four-way valve, the No. two four-way valve is connected with one end of a No. two condenser 10, the other end of the No. two condenser 10 is connected with an intermediate heat exchanger 6, the other end of the intermediate heat exchanger 6 is connected with a No. two electronic expansion valve 12, the No. two electronic expansion valve 12 is connected with a No. two evaporator 13, the other end of the No. two evaporator 13 is connected with a No. two four-way valve, and one end of the No. two four-way valve.
An air duct door A, an air duct door B and an air duct door E are arranged on the first drying room 7, and an air duct 17 is arranged between the air duct door A and the air duct door E; an opening is arranged near the air duct door A of the air duct 17 and communicated with the air duct door C through the two air ducts 21; an air duct 17 is provided with an air duct door G and an air duct door H, and an air duct door I is arranged inside the air duct 17. An air duct door C, an air duct door D and an air duct door F are arranged on the second drying room 14, a three air duct 18 is arranged between the air duct door F and the air duct door H, an air duct door J is arranged on the three air duct 18, a four air duct 11 is arranged between the air duct door D and the air duct door J, a normally open door M and a normally open door N are arranged on the four air duct 11, a five air duct 20 is arranged between the air duct door B and the normally open door M, and a six air duct 19 is arranged between the air duct door G and the normally open door N; the first condenser 3 is disposed in an air duct 17, and the second condenser 10 is disposed in a four air duct 11.
The second compressor 9 conveys high-temperature gaseous refrigerants into the second condenser 10, the second condensing fan 16 conveys hot air into the second drying room 14 through the four air channels 11, the temperature in the second drying room 14 is kept at 30-50 ℃, at the moment, the air channel door D is opened, and the air channel door C is closed; the refrigerant then passes through the electronic expansion valve 12 to the intermediate heat exchanger 6, through the second evaporator 13, and back to the suction port of the second compressor 9.
The intermediate heat exchanger 6 is used for heat exchange and is used for ensuring the high exhaust temperature of a first system, one side of the intermediate heat exchanger 6 is a low-temperature liquid refrigerant after a first electronic expansion valve 5, the other side of the intermediate heat exchanger is a second system high-temperature high-pressure liquid refrigerant, when the intermediate heat exchanger 6 works, the first system absorbs heat from the second system to cause the return air of the first system to rise, the second system high-temperature refrigerant is used for improving the superheat degree of the first system, so that the exhaust temperature is improved, at the moment, the air duct door A, D is opened, the air duct door B, C is closed, so that the first drying room 7 belongs to a high-temperature drying area, the second drying room 14 belongs to a normal-temperature drying area, the exhaust temperature is higher than that of the second system due to the suction superheat of the first system, so that the first condensing fan 15 blows out high-temperature gas, the second condensing fan 16 blows out normal-temperature gas, and, a stage heating state is formed.
In the drying process of most products, the temperature is required to be raised in stages, and sudden large temperature difference cannot occur, so that the quality of the dried products is difficult to guarantee. At this moment, the first drying room 7 is high in temperature, the second drying room 14 is normal in temperature, when the dried product in the first drying room 7 meets the requirement of drying, the air duct door A is closed, the air duct door B and the air duct door C are opened, and at this moment, the first drying room 7 is normal in temperature, and the second drying room 14 is high in temperature. Compared with the traditional heat pump, the heating mode saves more time, and because the traditional heat pump is a drying room for heating, the time required is longer and the efficiency is low from the normal temperature to the high temperature. For example, in the conventional heat pump drying, one unit corresponds to one drying room, and when a product is dried, the product is preheated for 2 hours at normal temperature, then kept at the medium temperature for 3 hours, and dried at the high temperature for 3 hours, so that the total time is 8 hours. The system can simultaneously dry at normal temperature and high temperature, the time is reduced, the amount of dried products is increased, when the drying is started, the products are respectively placed into the first drying room 7 and the second drying room 14, the second system is not started at the moment, after the first system is preheated, the second system is started, the first system is overheated by air suction and is increased in exhaust temperature due to the fact that the second system is started, the intermediate heat exchanger 7 exchanges heat, the first drying room 7 keeps high-temperature drying, and the second drying room 14 keeps normal-temperature drying.
When the products in the first drying room meet the drying requirement, the air duct door A, D, I, J is opened, the air duct door B, C, G, H is closed, the second drying room 14 is changed from normal temperature to high temperature, the first drying room 7 is changed from high temperature to normal temperature, new products are added into the first drying room 7, then preheating is carried out, and the second drying room 14 is dried at high temperature. When the products in the second drying room 14 meet the drying requirements, the air duct door A, D, I, J is closed, the air duct door B, C, G, H is opened, the second drying room 14 is changed from high temperature to normal temperature, the first drying room 7 is changed from normal temperature to high temperature, new products are added into the second drying room 14, then preheating is carried out, and the first drying room 7 is dried at high temperature; therefore, the drying is circulated and the efficiency is high.
One traditional heat pump drying-machine also is many systems, but every system is independent, and hot-blast primary grade heats, and during the normal atmospheric temperature was dried, because the heat that needs is not many, only opens a system many times, and other systems are in standby state, and along with time and temperature requirement, other systems start one by one, because adjust mutually and lead to the temperature fluctuation, influence product quality, so compare this system efficient down, stability is better.
The air duct door control method comprises the following steps:
when the drying is started, the first system is started firstly, the air duct door A, D, I, J is opened, the air duct door B, C, G, H is closed, the air of the first system is heated by the first condenser 3 and then is delivered to the air duct door A under the action of the first condensing fan 15 to enter the first drying room 7, the air duct door B is closed at the moment, and the second system is in a standby state. At the moment, the dried articles are heated by hot air, then reach the first evaporator 8 for heat recovery, enter the air duct door E, and then return to the first condensing fan 15 through the air duct 17 for reheating.
When the first drying room 7 reaches the condition, the second system is started at the moment, the air duct door A, D, I, J is kept open, the air duct door B, C, G, H is closed, the air of the second system is heated by the second condenser 10, and then is delivered to the D port under the action of the second condensing fan 16 to enter the second drying room 14, the dried articles are heated by hot air at the moment, and then the heated articles reach the second evaporator 13 to be subjected to heat recovery and then enter the air duct door F, and then the heated articles return to the second condensing fan 10 through the four air ducts 11 to be heated again.
When the first drying room 7 meets the high-temperature quitting condition and the second system meets the normal-temperature drying condition, the air duct door A, D, I, J is closed, the air duct door B, C, G, H is opened, the air of the first system reaches the air duct door G through the opening E, reaches the four air ducts 11 through the six air ducts 19, reaches the air duct door B through the second condenser 10 along the five air ducts 20, and then the first drying room 7 is dried at normal temperature. The air of the second system reaches the air duct door H through the air duct door F, reaches the air duct door C along the second air duct 21 through the first air duct 17 to the first condenser 3, and then the second drying room is dried at high temperature.
The invention has the following characteristics:
the method has the characteristics that: stable control and ensured product quality
Many heat pump dryers on the market are independent systems, and then heat layer by layer, and at this time, temperature rise is difficult and unstable. Because the machines are independent and mutually adjusted, the feedback information slowly causes heat fluctuation, thereby influencing the quality of products. In response to these problems, this system was studied in its design and overcomes these problems. The system utilizes the intermediate heat exchanger to stably maintain the high exhaust temperature of the first system, the supercooling degree of the second system is increased, and the overall capacity of the unit is increased. The system is connected in parallel through the intermediate heat exchanger, the adjustment reaction is rapid, and the feedback information is faster compared with the independent control, so that the stability of the temperature of the drying room is ensured, and the quality of the product is ensured.
The method has the following characteristics: high efficiency, staged heating
When the product is dried, the product has technological requirements, for example, longan is dried at normal temperature (30-40 ℃), longan is subjected to pre-heat curing to prevent sugar loss caused by high temperature, and high-temperature drying is started after sugar curing is finished. Use traditional heat pump drying-machine, a unit corresponds a stoving room, starts one or two systems earlier and carries out normal atmospheric temperature stoving to the longan, and other systems are in standby state, and overall efficiency ratio is lower like this. However, this system overcomes this problem, the system being fully operational and drying a greater quantity of product than conventional heat pumps. If when the system is used for drying, longan is firstly added into the first drying room 7 and the second drying room 14 respectively, at the moment, the air duct door A, D, I, J of the air duct door is opened, the air duct door B, C, G, H is closed, the first system is started for preheating and drying, the second system is in a standby state, when the longan in the first drying room 7 is preheated, the second system is started, the first system inhales and overheats under the action of the intermediate heat exchanger 6, exhaust is increased, the first drying room 7 is changed from a normal-temperature drying room into a high-temperature drying room, and exhaust of the second system cannot be too high under the action of the intermediate heat exchanger 6, so the second drying room 14 is kept in a normal-temperature state, and the longan in the second drying room is preheated and dried at normal temperature. When the longan in the first drying room 7 reaches the drying requirement, the air duct door A, D, I, J is closed, the air duct door B, C, G, H is opened, at the moment, the high temperature of the first drying room 7 is changed to the normal temperature, the normal temperature of the second drying room 14 is changed to the high temperature, and meanwhile, the product in the first drying room 7 is removed and replaced by a new product. When the longan reaches the requirement in No. two stoving rooms 14 again, air duct door A, D is opened, air duct door B, C is closed, this moment No. 7 normal atmospheric temperature of stoving room changes the high temperature, No. two stoving room 14 high temperature changes the normal atmospheric temperature, withdraw the product in No. two stoving rooms 14 simultaneously, change new product, so recycling, the machine is in whole running state, two stoving room temperatures in addition can heat in grades, the quantity of stoving product is more than traditional heat pump stoving quantity, accelerate the speed of stoving, improve its efficiency.
The characteristics are three: energy saving
The system adopts a closed-loop drying method, the evaporator recovers heat in the drying room, the machine has high energy efficiency ratio and is energy-saving, meanwhile, the machine is not influenced by the environmental temperature, and the phenomena of frosting and defrosting can not occur in winter, so that the whole system is relatively stable, and the quality of products is ensured.
The first stage of the invention is controlled as follows:
the system is controlled and designed to achieve drying time, drying temperature and relative humidity, when the system starts to work, the first system is started first, the second system is in standby, the air duct door A, D, I, J is opened, B, C, G, H is closed, the drying temperature and humidity of the drying room in the current situation are detected, capacity output control is carried out according to a difference value of a comparison target, the system is started to carry out time calculation, the target value is two hours, and when the humidity and the drying temperature reach the set target and are not increased within 10 minutes, the second system is started.
If the drying temperature does not reach the set drying temperature within one hour, detecting the capacity output proportion of the compressor, if the output is 100%, starting electric heating, raising the temperature, giving a warning on a control screen, and giving a fault prompt to check whether heat leakage exists or not without influencing the operation of the unit, if the output of the compressor does not reach 100%, increasing the frequency according to a program, detecting the drying temperature after half an hour, and if the output of the compressor does not reach the set temperature, starting electric heating.
The second stage control is as follows:
at this moment, the first drying room is in high-temperature drying, the second drying room is in normal-temperature drying, when the first drying room meets the requirements of setting drying temperature, wet-bulb temperature and time, the air duct door A, D, I, J is closed, the air duct door B, C, G, H is opened, then the normal-temperature high-temperature drying of the second drying room is realized, the high-temperature drying of the second drying room is realized, and the normal-temperature drying of the first drying room is realized.
When the second system reaches the drying condition and the first system also reaches the drying condition, the air duct door A, D, I, J is opened, the air duct door B, C, G, H is closed, if the second drying room reaches the drying condition and the first drying room does not reach the drying condition, the frequency of the compressor of the second system is reduced, and the first drying room continues to dry.
When the first drying room reaches the condition and the second drying room does not reach the condition, the first drying room keeps normal operation, the temperature is kept constant, and the condition of the second system is waited to reach.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. The heat pump drying system is characterized by comprising a first system, a second system, a first drying room (7) and a second drying room (14), wherein the first system comprises a first compressor (1), a first four-way valve (2), a first condenser (3), a first air duct (4), a first electronic expansion valve (5), a first evaporator (8) and a first condensing fan (15), and the first evaporator (8) is arranged in the first drying room (7); the second system comprises a second compressor (9), a second four-way valve, a second condenser (10), a second air channel (11), a second electronic expansion valve (12), a second evaporator (13) and a second condensing fan (16), wherein the second evaporator (13) is positioned in a second drying room (14); an intermediate heat exchanger (6) is communicated on a pipeline between the first electronic expansion valve (5) and the first evaporator (8); the other side of the intermediate heat exchanger (6) is communicated with a pipeline between a second condenser (10) and a second electronic expansion valve (12); an air duct door A, an air duct door B and an air duct door E are arranged on the first drying room (7), and an air duct (17) is arranged between the air duct door A and the air duct door E; an opening is arranged near an air duct door A of the air duct (17) and communicated with the air duct door C through two air ducts (21); an air duct door G and an air duct door H are arranged on the air duct (17); an air duct door C, an air duct door D and an air duct door F are arranged on the second drying room (14), three air ducts (18) are arranged between the air duct door F and the air duct door H, an air duct door J is arranged on the three air ducts (18), four air ducts (11) are arranged between the air duct door D and the air duct door J, normally-open doors M and N are arranged on the four air ducts (11), five air ducts (20) are arranged between the air duct door B and the normally-open doors M, and six air ducts (19) are arranged between the air duct door G and the normally-open doors N; the first condenser (3) is arranged in an air duct (17), and the second condenser (10) is arranged in a four-air duct (11).
2. The energy efficient, staged heating, heat pump drying system of claim 1, wherein said drying system is operated by: a second compressor (9) conveys high-temperature gaseous refrigerant to a second condenser (10), a second condensing fan (16) conveys hot air into a second drying room (14) through a four air channel (11), the temperature in the second drying room (14) is kept at 30-50 ℃, an air channel door D is opened at the moment, and an air channel door C is closed; then the refrigerant passes through the electronic expansion valve (12) to the intermediate heat exchanger (6), passes through the second evaporator (13) and returns to the suction port of the second compressor (9).
3. The high-efficiency energy-saving heat pump drying system with staged heating as claimed in claim 2, wherein one side of the intermediate heat exchanger (6) is a low-temperature liquid refrigerant after the first electronic expansion valve (5), and the other side is a high-temperature and high-pressure liquid refrigerant of the second system, when in operation, the first system absorbs heat from the second system at the intermediate heat exchanger (6) to cause the return air of the first system to rise, the high-temperature refrigerant of the second system is utilized to increase the superheat degree of the first system, so as to increase the exhaust temperature, at the time, the air duct door A, D is opened, the air duct door B, C is closed, so that the first drying room (7) belongs to a high-temperature drying area, the second drying room (14) belongs to a normal-temperature drying area, because the suction superheat of the first system is higher than that of the second system, the first condensing fan (15) blows a high-temperature gas, and the second condensing fan (16) blows a normal-temperature gas, then the air is blown to different drying rooms to form a stage heating state.
4. The energy efficient, staged heating, heat pump drying system of claim 1, wherein said drying system is operated by: when the drying is started, the first system is started firstly, the air duct door A, D, I, J is opened, the air duct door B, C, G, H is closed, the air of the first system is heated by the first condenser (3) and then is delivered to the air duct door A under the action of the first condensing fan (15) to enter the first drying room (7), the air duct door B is closed at the moment, and the second system is in a standby state; at the moment, the dried articles are heated by hot air, then reach the first evaporator (8) for heat recovery, enter the air duct door E, and then return to the first condensing fan (15) through the air duct (17) for reheating.
5. The high-efficiency energy-saving heat pump drying system with staged heating as claimed in claim 4, wherein when the first drying room (7) reaches the condition, the second system is started, the air duct door A, D, I, J is kept open, the air duct door B, C, G, H is closed, the air of the second system is heated by the second condenser (10), and then is delivered to the opening D under the action of the second condensing fan (16) to enter the second drying room (14), and at the same time, the dried articles are heated by hot air, and then the heated air enters the air duct door F after reaching the second evaporator (13) for heat recovery, and then returns to the second condensing fan (10) through the four air duct (11) for reheating.
6. The high-efficiency energy-saving heat pump drying system with staged heating according to claim 4, wherein when the first drying room (7) meets the high-temperature exit condition and the second system meets the normal-temperature drying condition, the air duct door A, D, I, J is closed, the air duct door B, C, G, H is opened, the air of the first system reaches the air duct door G through the E port, reaches the four air ducts (11) through the six air ducts (19), reaches the air duct door B along the five air ducts (20) through the second condenser (10), and then the first drying room (7) is dried at normal temperature; the air of the second system reaches the air duct door H through the air duct door F, reaches the air duct door C along the second air duct (21) through the first air duct (17) to the first condenser (3), and then turns to high-temperature drying in the second drying room.
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| CN202110075709.8A CN112856950B (en) | 2021-01-20 | 2021-01-20 | Efficient energy-saving heat pump drying system capable of heating in stages |
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| CN202110075709.8A CN112856950B (en) | 2021-01-20 | 2021-01-20 | Efficient energy-saving heat pump drying system capable of heating in stages |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130298421A1 (en) * | 2012-05-10 | 2013-11-14 | Norgren Automation Solutions, Llc | Method and apparatus for automatically drying wet floors |
| KR20160095741A (en) * | 2015-02-04 | 2016-08-12 | (주)오성 | Dehumidification Dryer |
| CN205561428U (en) * | 2016-01-15 | 2016-09-07 | 深圳市凡兵生态科技有限公司 | High -efficient air energy dryer |
| CN106196913A (en) * | 2016-07-08 | 2016-12-07 | 四川自然道节能科技有限公司 | Double source enclosed efficient energy-saving drying system |
| CN210070395U (en) * | 2019-04-24 | 2020-02-14 | 邵东智能制造技术研究院有限公司 | Heating system of lost foam drying room |
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2021
- 2021-01-20 CN CN202110075709.8A patent/CN112856950B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130298421A1 (en) * | 2012-05-10 | 2013-11-14 | Norgren Automation Solutions, Llc | Method and apparatus for automatically drying wet floors |
| KR20160095741A (en) * | 2015-02-04 | 2016-08-12 | (주)오성 | Dehumidification Dryer |
| CN205561428U (en) * | 2016-01-15 | 2016-09-07 | 深圳市凡兵生态科技有限公司 | High -efficient air energy dryer |
| CN106196913A (en) * | 2016-07-08 | 2016-12-07 | 四川自然道节能科技有限公司 | Double source enclosed efficient energy-saving drying system |
| CN210070395U (en) * | 2019-04-24 | 2020-02-14 | 邵东智能制造技术研究院有限公司 | Heating system of lost foam drying room |
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