CN110763005B - Heat pump type double-fluid dehumidification heating dryer and drying chamber - Google Patents
Heat pump type double-fluid dehumidification heating dryer and drying chamber Download PDFInfo
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- CN110763005B CN110763005B CN201911141815.0A CN201911141815A CN110763005B CN 110763005 B CN110763005 B CN 110763005B CN 201911141815 A CN201911141815 A CN 201911141815A CN 110763005 B CN110763005 B CN 110763005B
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- water
- drying chamber
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- 238000001035 drying Methods 0.000 title claims abstract description 98
- 238000010438 heat treatment Methods 0.000 title claims abstract description 41
- 239000012530 fluid Substances 0.000 title claims abstract description 37
- 238000007791 dehumidification Methods 0.000 title description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 108
- 238000001816 cooling Methods 0.000 claims abstract description 31
- 238000001704 evaporation Methods 0.000 claims description 19
- 230000008020 evaporation Effects 0.000 claims description 12
- 238000010257 thawing Methods 0.000 claims description 12
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005057 refrigeration Methods 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000003507 refrigerant Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 9
- 241000208125 Nicotiana Species 0.000 description 3
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 3
- 244000269722 Thea sinensis Species 0.000 description 3
- 235000013339 cereals Nutrition 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 3
- 235000013399 edible fruits Nutrition 0.000 description 3
- 235000014102 seafood Nutrition 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000000819 phase cycle Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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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
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/14—Collecting or removing condensed and defrost water; Drip trays
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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
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a heat pump type double-fluid dehumidifying and heating dryer and a drying chamber, wherein the dryer comprises a heat pump unit body with a refrigeration working medium loop, a control unit, a fan and a hot water pump, the refrigeration working medium loop comprises an air-cooled evaporator, a water-cooled condenser, a throttle valve and a compressor which are connected in series, the heat pump unit body is also provided with a humid air inlet, a dry air outlet, a hot water return port and a hot water outlet, an air cooling channel of the humid air inlet, the fan and the air-cooled evaporator are communicated with the dry air outlet, a hot water return port, the hot water pump, a water cooling channel of the water-cooled condenser and the hot water outlet are communicated with each other, and the drying chamber comprises the dryer. The invention has the advantages of low drying energy consumption, low use cost, high temperature regulation precision and low dehumidifying energy consumption, can meet the drying requirements of different objects to be dried on temperature requirements, and has good energy saving and emission reduction effects and wide market application and popularization prospects.
Description
Technical Field
The invention relates to heat pump type drying equipment, in particular to a heat pump type double-fluid dehumidifying and heating dryer and a drying chamber with characteristics of dehumidifying drying and heating drying.
Background
At present, the adopted dryers are heating convection dryers aiming at the scenes of wood, tobacco leaves, tea leaves, grains, fruits, seafood products and the like, and the moisture of the dried objects is removed through heating and forced convection, so that the aim of drying is fulfilled. However, the conventional heating type dryer has the following problems: the heat loss of the dehumidification is high, the heating power consumption is high, the humidity and temperature adjusting capability is weak, and the drying requirements of different objects to be dried are difficult to achieve.
Disclosure of Invention
The invention aims to solve the technical problems: aiming at the problems in the prior art, the heat pump type double-fluid dehumidifying and heating dryer and the drying chamber are provided, the heat pump type double-fluid dehumidifying and heating dryer has the characteristics of dehumidifying, drying and heating drying, has independent humidity and temperature adjusting capability, can realize continuous dehumidification, has low drying energy consumption, low use cost, high temperature adjusting precision and low dehumidifying energy consumption, greatly improves the drying efficiency, can realize automatic dehumidification of the drying chamber according to the humidity change of drying materials, can meet the drying requirements of different dried objects on temperature, can be applied to the scenes of drying heat-sensitive materials such as wood, tobacco leaves, tea leaves, grains, fruits, seafood products and the like, and has good energy saving and emission reduction effects and wide market application and popularization prospects.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a heat pump type double-fluid dehumidifying and heating dryer which comprises a heat pump unit body with a refrigeration working medium loop and a control unit, a fan and a hot water pump, wherein the refrigeration working medium loop comprises an air-cooled evaporator, a water-cooled condenser, a throttle valve and a compressor which are connected in series, the control end of the throttle valve is connected with the control unit, the heat pump unit body is also provided with a humid air inlet, a dry air outlet, a hot water return port and a hot water outlet, the humid air inlet is communicated with the air-cooled channel inlet of the air-cooled evaporator through the fan, the dry air outlet is communicated with the air-cooled channel outlet of the air-cooled evaporator, the hot water return port is communicated with the water-cooled channel inlet of the water-cooled condenser through the hot water pump, and the control ends of the throttle valve, the compressor, the fan and the hot water pump are respectively connected with the control unit.
Optionally, an auxiliary air inlet is connected in parallel between the humid air inlet and the air cooling channel inlet of the air-cooled evaporator.
Optionally, an auxiliary air outlet is connected in parallel between the dry air outlet and the air cooling channel outlet of the air-cooled evaporator.
Optionally, a water collecting disc is further arranged at the bottom of the air-cooled evaporator, an expansion water tank is further arranged in the heat pump unit body, the water collecting disc is connected with a water inlet of the expansion water tank, and a water outlet of the expansion water tank is connected in parallel between the hot water return port and a water cooling channel inlet of the water-cooled condenser or between the hot water outlet and a water cooling channel outlet of the water-cooled condenser.
Optionally, the air-cooled evaporator is further provided with a defrosting pipe and an evaporation temperature sensor, the defrosting pipe and the evaporation temperature sensor are respectively connected with the control unit, and the control unit controls the working state of the defrosting pipe according to the evaporation temperature detected by the evaporation temperature sensor.
Optionally, the air cooling channel inlet of the air-cooled evaporator is further provided with an air inlet humidity sensor, the air inlet humidity sensor is connected with a control unit, and the control unit controls the opening of the throttle valve according to the evaporation humidity detected by the air inlet humidity sensor.
Optionally, the refrigerant circuit is provided with front end temperature sensor and front end pressure sensor on the upper reaches of compressor, is provided with rear end temperature sensor and rear end pressure sensor on the low reaches of compressor, front end temperature sensor, front end pressure sensor, rear end temperature sensor, rear end pressure sensor link to each other with the control unit respectively, the control unit is according to the difference in temperature between front end temperature sensor, the rear end temperature sensor and the pressure difference between front end pressure sensor, the rear end pressure sensor control compressor operating condition.
Optionally, a filter is arranged at the wet air inlet, and an unobstructed filter is arranged at the hot water return port.
Optionally, the control unit is further connected with a drying chamber humidity sensor, and the control unit controls the rotating speed of the fan according to the drying chamber humidity detected by the drying chamber humidity sensor.
Optionally, the control unit is further connected with a drying chamber temperature sensor, the hot water pump is further connected with a frequency converter, a control end of the frequency converter is connected with the control unit, and the control unit controls the frequency of the frequency converter according to the drying chamber temperature detected by the drying chamber temperature sensor.
The invention provides a drying chamber which comprises a drying chamber body with a heat exchange tube and the heat pump type double-fluid dehumidifying and heating dryer, wherein the connecting end of the heat exchange tube is respectively communicated with a hot water return port and a hot water outlet port of the heat pump type double-fluid dehumidifying and heating dryer, the drying chamber body is also provided with an air inlet and an air outlet, the air inlet is communicated with a drying air outlet of the heat pump type double-fluid dehumidifying and heating dryer, and the air outlet is communicated with a humid air inlet of the heat pump type double-fluid dehumidifying and heating dryer.
Compared with the prior art, the invention has the following advantages:
1. the heat pump unit body is provided with the air-cooled evaporator, the water-cooled condenser, the wet air inlet, the dry air outlet, the hot water reflux port and the hot water outlet, wherein the wet air inlet is communicated with the air cooling channel inlet of the air-cooled evaporator through the fan, the dry air outlet is communicated with the air cooling channel outlet of the air-cooled evaporator, the hot water reflux port is communicated with the water cooling channel inlet of the water-cooled condenser through the hot water pump, the hot water outlet is communicated with the water cooling channel outlet of the water-cooled condenser, the control ends of the throttle valve, the compressor, the fan and the hot water pump are respectively connected with the control unit, so that a drying system for efficiently utilizing heat generated by heating and drying hot water at the hot end of the heat pump and dehumidifying and drying at the cold end of the heat pump is formed, and the integrated drying chamber structure of the double-fluid (air and water) refrigerating medium is compact in structure and small in occupied space, and thus the miniaturization of the drying equipment and the drying chamber can be realized.
2. The double-fluid (air and water) integrated dryer formed by the air-cooled evaporator and the water-cooled condenser has the independent temperature and humidity control function, so that the loss caused by heat and humidity combined treatment in a conventional heat pump system is avoided. And (3) temperature control: the secondary refrigerant in the water-cooled condenser absorbs the heat of the refrigerant, the water temperature is increased, the heated water enters the drying chamber to control the temperature of the drying chamber, and the material and the air in the drying chamber can be heated by adjusting the performance of the hot water pump, so that the temperature is controlled, and the temperature in the drying chamber reaches the set requirement; humidity control: the air-cooled evaporator condenses the moisture-removing air in the drying chamber, and after the moisture content of the moisture-removing air is reduced, the moisture-removing air enters the drying chamber, the opening of the throttle valve is changed, and the flow rate of the refrigerant is controlled, so that the evaporating temperature is changed, and the air humidity can reach the requirement of entering the drying chamber.
3. The invention sets the temperature difference of the double-fluid heat carrier hot water in the drying chamber, and the wet air enters the system circulation volume after the heat carrier air is dehumidified, so as to obtain higher evaporating temperature, and simultaneously, the invention can greatly reduce the energy consumption required by the high-pressure steam condensation of the refrigerant in the condenser, improve the energy efficiency ratio, and can achieve higher condensate water temperature difference without depending on the high pressure ratio of the compressor, thereby almost completely eliminating the conditions of high-pressure alarm of the condenser, the protection stop of the compressor, the low-temperature frosting of the evaporator and the shutdown frosting of the compressor, and greatly improving the overall operation efficiency of the system.
Drawings
Fig. 1 is a schematic diagram of the principle structure of an embodiment of the present invention.
Legend description: 1. an air-cooled evaporator; 11. a humid air inlet; 12. a dry air outlet; 13. an auxiliary air inlet; 14. an air outlet is assisted by wind; 15. a water collecting tray; 16. a defrosting pipe; 17. an evaporation temperature sensor; 18. an intake air humidity sensor; 2. a water-cooled condenser; 21. a hot water return port; 22. a hot water outlet; 3. a throttle valve; 4. a compressor; 41. a front end temperature sensor; 42. a front end pressure sensor; 43. a rear end temperature sensor; 44. a back-end pressure sensor; 5. a control unit; 51. a drying chamber humidity sensor; 52. a drying chamber temperature sensor; 6. a blower; 7. a hot water pump; 8. an expansion tank; 9. a drying chamber body; 91. a heat exchange tube; 92. an air inlet; 93. and an air outlet.
Detailed Description
As shown in fig. 1, the heat pump type dual-fluid dehumidifying and heating dryer of the embodiment comprises a heat pump unit body with a refrigerating medium loop and a control unit 5, a fan 6 and a hot water pump 7, wherein the refrigerating medium loop comprises an air-cooled evaporator 1, a water-cooled condenser 2, a throttle valve 3 and a compressor 4 which are connected in series, the control end of the throttle valve 3 is connected with the control unit 5, a moist air inlet 11, a dry air outlet 12, a hot water return 21 and a hot water outlet 22 are also arranged on the heat pump unit body, the moist air inlet 11 is communicated with the air-cooled channel inlet of the air-cooled evaporator 1 through the fan 6, the dry air outlet 12 is communicated with the air-cooled channel outlet of the air-cooled evaporator 1, the hot water return 21 is communicated with the water-cooled channel inlet of the water-cooled condenser 2 through the hot water pump 7, the hot water outlet 22 is communicated with the water-cooled channel outlet of the water-cooled condenser 2, and the control ends of the throttle valve 3, the compressor 4, the fan 6 and the hot water pump 7 are respectively connected with the control unit 5. The heat pump type double-fluid dehumidifying and heating dryer of the embodiment forms a drying system for efficiently utilizing heat generated by hot water heating and drying at the hot end of the heat pump and dehumidifying and drying at the cold end of the heat pump, and forms a double-fluid (air and water) secondary refrigerant integrated drying chamber structure, so that the heat pump type double-fluid dehumidifying and heating dryer is compact in structure and small in occupied space, and therefore miniaturization of drying equipment and drying chambers can be achieved. Wherein, the refrigerant of the refrigerant loop can adopt R22, R134a or R133 refrigerant according to the requirement; the heat carrier of the water cooling channel of the water-cooled condenser 2 can be wet air or water. The heat pump type double-fluid dehumidifying and heating dryer of the embodiment forms a double-fluid (air and water) integrated dryer with independent temperature and humidity control function, so that the loss caused by heat and humidity combined treatment in a conventional heat pump system is avoided. And (3) temperature control: the water temperature is increased after the coolant in the water-cooled condenser 2 absorbs the coolant heat, the warmed water enters the drying chamber to control the temperature of the drying chamber, and the material and air in the drying chamber can be heated by adjusting the performance of the hot water pump 7, so that the temperature is controlled, and the temperature in the drying chamber reaches the set requirement; humidity control: the air-cooled evaporator 1 condenses the moisture-removing air in the drying chamber, and after the moisture content of the moisture-removing air is reduced, the air enters the drying chamber, the opening of the throttle valve 3 is changed, and the flow rate of the refrigerant is controlled, so that the evaporating temperature is changed, and the air humidity can reach the requirement of entering the drying chamber.
As shown in fig. 1, a filter is arranged at the humid air inlet 11, a non-resistance filter is arranged at the hot water return port 21, and through the filter structure, the air cooling channel of the air-cooled evaporator 1 and the water cooling channel of the water-cooled condenser 2 can be ensured to be free from foreign matters, and the performances and the service lives of the air-cooled evaporator 1 and the water-cooled condenser 2 can be ensured.
As shown in fig. 1, an auxiliary air inlet 13 is further connected in parallel between the humid air inlet 11 and the air-cooled evaporator 1 air-cooled channel inlet, and the auxiliary air inlet 13 is used for forming a semi-open circulation structure between the humid air inlet 11 and the air-cooled evaporator 1 air-cooled channel inlet, so as to ensure that the evaporator has enough heat to completely vaporize the refrigerant, thereby achieving the purposes of ensuring heat balance and improving heat transfer efficiency.
As shown in fig. 1, an auxiliary air outlet 14 is further connected in parallel between the dry air outlet 12 and the air cooling channel outlet of the air-cooled evaporator 1, and the auxiliary air outlet 14 is used for forming a semi-open circulation structure between the dry air outlet 12 and the air cooling channel outlet of the air-cooled evaporator 1, so that the temperature of the dryer is easy to rise, and the air entering the drying chamber is easy to saturate, thereby achieving the purposes of ensuring heat balance and improving heat transfer efficiency.
As shown in fig. 1, the bottom of the air-cooled evaporator 1 is further provided with a water collecting disc 15, the heat pump unit body is further provided with an expansion water tank 8, the water collecting disc 15 is connected with a water inlet of the expansion water tank 8, a water outlet of the expansion water tank 8 is connected in parallel between a hot water return port 21 and a water cooling channel inlet of the water-cooled condenser 2 or between a hot water outlet 22 and a water cooling channel outlet of the water-cooled condenser 2, and by the structure, the supplementing water of the heat carrier of the water cooling channel of the water-cooled condenser 2 can be supplemented by the dried wet air condensate water.
As shown in fig. 1, the air-cooled evaporator 1 is further provided with a defrosting pipe 16 and an evaporation temperature sensor 17, the defrosting pipe 16 and the evaporation temperature sensor 17 are respectively connected with the control unit 5, as shown by an arrow a in fig. 1, the control unit 5 controls the working state of the defrosting pipe 16 according to the evaporation temperature detected by the evaporation temperature sensor 17, can prevent the air-cooled evaporator 1 from supercooling and frosting, ensures that the air-cooled evaporator 1 can be used in a colder region or season, and can be specifically set to be lower than a set temperature to start the defrosting pipe 16 for defrosting.
As shown in fig. 1, the inlet of the air cooling channel of the air-cooled evaporator 1 is further provided with an air inlet humidity sensor 18, the air inlet humidity sensor 18 is connected with the control unit 5, as shown by an arrow c in fig. 1, the control unit 5 controls the opening of the throttle valve 3 according to the evaporation humidity detected by the air inlet humidity sensor 18, the purpose of controlling the opening of the throttle valve 3 is to control the humidity of the air cooling channel of the air-cooled evaporator 1 (the humidity of the drying chamber), and the independent control of the humidity is realized, and a specific control mode can be realized by adopting a PID control strategy.
In this embodiment, an under-voltage, over-current, temperature and phase sequence protection device is arranged in the body of the compressor 4, and the compressor 4 is automatically stopped when the under-voltage, over-current, temperature is too high and phase sequence is wrong, so that the compressor 4 can be effectively protected.
As shown in fig. 1, a front end temperature sensor 41 and a front end pressure sensor 42 are disposed on the refrigerant circuit upstream of the compressor 4, a rear end temperature sensor 43 and a rear end pressure sensor 44 are disposed downstream of the compressor 4, the front end temperature sensor 41, the front end pressure sensor 42, the rear end temperature sensor 43 and the rear end pressure sensor 44 are respectively connected with the control unit 5, as shown by an arrow d in fig. 1, the control unit 5 controls the working state of the compressor 4 according to the temperature difference between the front end temperature sensor 41 and the rear end temperature sensor 43 and the pressure difference between the front end pressure sensor 42 and the rear end pressure sensor 44, and the working state of the compressor 4 aims to achieve energy saving based on start-stop of the compressor.
As shown in fig. 1, the control unit 5 is further connected with a drying chamber humidity sensor 51, and as shown by an arrow b in fig. 1, the control unit 5 controls the rotation speed of the fan 6 according to the drying chamber humidity detected by the drying chamber humidity sensor 51, and the rotation speed of the fan 6 is used for assisting in controlling the humidity of the drying chamber, and a specific control mode can be realized by adopting a PID control strategy.
As shown in fig. 1, the control unit 5 is further connected with a drying chamber temperature sensor 52, the hot water pump 7 is further connected with a frequency converter 71, a control end of the frequency converter 71 is connected with the control unit 5, and as shown by an arrow e in fig. 1, the control unit 5 controls the frequency of the frequency converter 71 according to the drying chamber temperature detected by the drying chamber temperature sensor 52. The frequency control of the frequency converter 71 aims to realize the temperature control of the drying chamber, and the independent control of the temperature can be realized by adopting a PID control strategy. The drying chamber humidity sensor 51 and the drying chamber temperature sensor 52 may be of a split type, or may be an integrated temperature and humidity sensor as needed.
As shown in fig. 1, the drying chamber of the present embodiment includes a drying chamber body 9 with a heat exchange tube 91 and the foregoing heat pump type dual-fluid dehumidifying and heating dryer, where the connection end of the heat exchange tube 91 is respectively communicated with a hot water return port 21 and a hot water outlet port 22 of the heat pump type dual-fluid dehumidifying and heating dryer, the drying chamber body 9 is further provided with an air inlet 92 and an air outlet 93, the air inlet 92 is communicated with a dry air outlet 12 of the heat pump type dual-fluid dehumidifying and heating dryer, and the air outlet 93 is communicated with a humid air inlet 11 of the heat pump type dual-fluid dehumidifying and heating dryer. The heat exchange tube 91, the hot water return port 21, the hot water output port 22, the hot water pump 7, and the water cooling channel of the water-cooled condenser 2 form a closed circulation channel of the heat carrier, so as to transfer heat between the water cooling channel of the water-cooled condenser 2 and the drying chamber body 9. The heat exchange tube 91 may be a light pipe, a ribbed tube, or a finned tube as desired. In addition, the drying chamber body 9 can also be provided with a material rack, so that the dried material can be conveniently placed, and the drying effect of the dried material is better. It should be noted that, the air inlet 92 and the air outlet 93 should be disposed at a relatively long distance, so as to promote the best ventilation effect inside the drying chamber body 9. In summary, the heat pump type dual-fluid dehumidifying and heating dryer and the drying chamber have the characteristics of dehumidifying, drying and heating drying, have independent humidity and temperature adjusting capability, can realize continuous dehumidification, and have the advantages of low drying energy consumption, low use cost, high temperature adjusting precision, low dehumidifying energy consumption, great improvement of drying efficiency, realization of automatic dehumidification of the drying chamber according to the humidity change of the drying materials, capability of meeting the drying requirements of different dried objects on temperature, applicability to the drying of heat-sensitive materials such as wood, tobacco leaves, tea leaves, grains, fruits, seafood products and the like, and good energy saving and emission reduction effects and wide market application and popularization prospects.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (9)
1. The heat pump type double-fluid dehumidifying and heating dryer is characterized by comprising a heat pump unit body with a refrigerating medium loop and a control unit (5), a fan (6) and a hot water pump (7), wherein the refrigerating medium loop comprises an air-cooled evaporator (1), a water-cooled condenser (2), a throttle valve (3) and a compressor (4) which are connected in series, the control end of the throttle valve (3) is connected with the control unit (5), a moist air inlet (11), a dry air outlet (12), a hot water return port (21) and a hot water outlet (22) are further arranged on the heat pump unit body, the moist air inlet (11) is communicated with the air-cooled channel inlet of the air-cooled evaporator (1) through the fan (6), the dry air outlet (12) is communicated with the air-cooled channel outlet of the air-cooled evaporator (1), the hot water return port (21) is communicated with the water-cooled channel inlet of the water-cooled condenser (2) through the hot water pump (7) and the water-cooled channel inlet of the water-cooled condenser (2), the throttle channel outlet of the hot water-cooled condenser (22) is communicated with the water-cooled condenser (2), the control outlet (4), the fan (6) and the hot water return port (4) are respectively connected with the air-cooled evaporator (1) at the bottom of the fan (5), the heat pump unit is characterized in that an expansion water tank (8) is further arranged in the heat pump unit body, the water collecting disc (15) is connected with a water inlet of the expansion water tank (8), and a water outlet of the expansion water tank (8) is connected in parallel between a hot water return port (21) and a water cooling channel inlet of the water cooling type condenser (2) or between a hot water outlet (22) and a water cooling channel outlet of the water cooling type condenser (2).
2. The heat pump type double-fluid dehumidifying and heating dryer as claimed in claim 1, wherein an auxiliary air inlet (13) is connected in parallel between the humid air inlet (11) and the air cooling channel inlet of the air-cooled evaporator (1).
3. The heat pump type double-fluid dehumidifying and heating dryer as claimed in claim 2, wherein an auxiliary air outlet (14) is connected in parallel between the dry air outlet (12) and the air cooling channel outlet of the air-cooled evaporator (1).
4. The heat pump type double-fluid dehumidifying and heating dryer as claimed in claim 1, wherein the air-cooled evaporator (1) is further provided with a defrosting pipe (16) and an evaporating temperature sensor (17), the defrosting pipe (16) and the evaporating temperature sensor (17) are respectively connected with the control unit (5), and the control unit (5) controls the working state of the defrosting pipe (16) according to the evaporating temperature detected by the evaporating temperature sensor (17).
5. The heat pump type double-fluid dehumidifying and heating dryer according to claim 1, wherein an air cooling channel inlet of the air cooling type evaporator (1) is further provided with an air inlet humidity sensor (18), the air inlet humidity sensor (18) is connected with a control unit (5), and the control unit (5) controls the opening degree of the throttle valve (3) according to the evaporation humidity detected by the air inlet humidity sensor (18).
6. The heat pump type double-fluid dehumidifying and heating dryer according to claim 1, wherein a front end temperature sensor (41) and a front end pressure sensor (42) are arranged on the refrigerating medium loop at the upstream of the compressor (4), a rear end temperature sensor (43) and a rear end pressure sensor (44) are arranged on the downstream of the compressor (4), the front end temperature sensor (41), the front end pressure sensor (42), the rear end temperature sensor (43) and the rear end pressure sensor (44) are respectively connected with a control unit (5), and the control unit (5) controls the working state of the compressor (4) according to the temperature difference between the front end temperature sensor (41) and the rear end temperature sensor (43) and the pressure difference between the front end pressure sensor (42) and the rear end pressure sensor (44).
7. The heat pump type double fluid dehumidifying and heating dryer as claimed in claim 1, wherein the control unit (5) is further connected with a drying chamber humidity sensor (51), and the control unit (5) controls the rotation speed of the fan (6) according to the drying chamber humidity detected by the drying chamber humidity sensor (51).
8. The heat pump type double-fluid dehumidifying and heating dryer according to claim 1, wherein the control unit (5) is further connected with a drying chamber temperature sensor (52), the hot water pump (7) is further connected with a frequency converter (71), a control end of the frequency converter (71) is connected with the control unit (5), and the control unit (5) controls the frequency of the frequency converter (71) according to the drying chamber temperature detected by the drying chamber temperature sensor (52).
9. The drying chamber is characterized by comprising a drying chamber body (9) with a heat exchange tube (91) and the heat pump type double-fluid dehumidifying and heating dryer as claimed in any one of claims 1 to 8, wherein the connecting end of the heat exchange tube (91) is respectively communicated with a hot water return port (21) and a hot water outlet port (22) of the heat pump type double-fluid dehumidifying and heating dryer, an air inlet (92) and an air outlet (93) are further arranged on the drying chamber body (9), the air inlet (92) is communicated with a dry air outlet (12) of the heat pump type double-fluid dehumidifying and heating dryer, and the air outlet (93) is communicated with a humid air inlet (11) of the heat pump type double-fluid dehumidifying and heating dryer.
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| CN201911141815.0A CN110763005B (en) | 2019-11-20 | 2019-11-20 | Heat pump type double-fluid dehumidification heating dryer and drying chamber |
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| CN110763005B true CN110763005B (en) | 2024-02-09 |
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| CN113124648A (en) * | 2021-04-12 | 2021-07-16 | 北京航空航天大学 | Drying system and method |
| CN113639341B (en) * | 2021-07-13 | 2022-10-04 | 清华大学 | Dehumidification hot water unit based on three medium heat exchangers |
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