CN113720113A - Air source heat pump dryer with heat recovery function - Google Patents
Air source heat pump dryer with heat recovery function Download PDFInfo
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- CN113720113A CN113720113A CN202110974183.7A CN202110974183A CN113720113A CN 113720113 A CN113720113 A CN 113720113A CN 202110974183 A CN202110974183 A CN 202110974183A CN 113720113 A CN113720113 A CN 113720113A
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- air
- drying chamber
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- heat
- source heat
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- 238000011084 recovery Methods 0.000 title claims abstract description 29
- 238000001035 drying Methods 0.000 claims abstract description 63
- 239000003507 refrigerant Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000007791 dehumidification Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
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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
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
- F26B9/066—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers the products to be dried being disposed on one or more containers, which may have at least partly gas-previous walls, e.g. trays or shelves in a stack
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
-
- 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
- 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
- F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
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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
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- 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]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to the technical field of air source heat pump dryers, in particular to an air source heat pump dryer with heat recovery. The air source heat pump system comprises an air source heat pump system, wherein a vertical air channel is arranged between the air source heat pump system and a drying chamber, the air channel is respectively connected with an evaporator and a condenser in the air source heat pump system, hot return air in the drying chamber is transmitted to the evaporator for utilization through a heat recovery assembly in the air channel, and meanwhile, the hot return air is transmitted to the condenser for utilization after heat exchange with fresh air. The invention recovers the hot return air of the drying chamber, on one hand, the hot return air in the drying chamber is transmitted to the evaporator for utilization, and the environment-friendly and energy-saving effect of heat recovery and utilization is achieved; on the other hand, the fresh air is supplemented through the fresh air window, and is transmitted to the condenser for utilization after being subjected to heat exchange with the hot return air, and the external cold air is preheated, so that the heat loss of the air source heat pump system is reduced, and the heat efficiency of the air source heat pump dryer is improved.
Description
Technical Field
The invention relates to the technical field of air source heat pump dryers, in particular to an air source heat pump dryer with heat recovery.
Background
An air source heat pump dryer is a novel drying device, and mainly realizes the purpose of carrying heat in air into a drying chamber through continuous circulation of a refrigerant, vaporizing and evaporating moisture in materials to be dried in a hot air mode, and discharging evaporated water vapor through a dehumidification system to achieve the purpose of drying the materials. The existing air source heat pump dryer also has the following two problems: 1. hot air in the drying chamber is directly discharged into the air without reasonable recovery, thus causing energy waste; 2. when the ambient temperature is lower, the heat pump dryer directly heats the cold air and consumes more energy, so that the heating efficiency is low, and the market demand can not be fully met.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a heat pump dryer with a heat recovery air source, hot return air in a drying chamber is transmitted to an evaporator for utilization, and fresh air supplemented by a fresh air window is transmitted to a condenser after heat exchange with the hot return air, so that the hot return air is effectively recycled.
In order to achieve the purpose, the invention is realized by the following technical scheme:
an air source heat pump dryer with heat recovery comprises an air source heat pump system, wherein a vertical air channel is arranged between the air source heat pump system and a drying chamber, the vertical air channel is respectively communicated with an evaporator and a condenser in the air source heat pump system, the vertical air channel is connected with the air inlet side of the condenser, hot return air in the drying chamber is transmitted to the evaporator for utilization through a heat recovery assembly in the vertical air channel, and meanwhile, the hot return air is transmitted to the condenser for utilization after being subjected to heat exchange with fresh air;
the heat recovery assembly comprises a heat exchange core body, one side of the heat exchange core body is connected with a fresh air window through a first air channel, the fresh air window is installed right above the air channel and communicated to the outside of the dryer, the other side of the heat exchange core body is connected with a negative pressure fan through a second air channel, and the negative pressure fan is aligned to the air inlet side of the evaporator.
Further, the air source heat pump system comprises an evaporator and an axial flow fan which are positioned above, and a compressor, a condenser and a centrifugal fan which are positioned below, wherein an air outlet of the axial flow fan is over against the evaporator, the compressor and the condenser are connected through a refrigerant pipeline, the condenser is connected with the centrifugal fan, and the centrifugal fan is communicated into the drying chamber.
Further, the centrifugal fan is communicated with one end of a lower air duct, the lower air duct is located below the drying chamber and the vertical air duct, the lower air duct is communicated with the drying chamber through a screen plate, the other end of the lower air duct is connected with a right air duct, the right air duct is located on the side of the drying chamber, and the right air duct is communicated into the drying chamber.
Furthermore, the other side of the drying chamber is communicated to the heat exchange core body in the air duct.
Further, the negative pressure fan is embedded and fixed on the middle partition plate, an air inlet of the negative pressure fan is connected with the second air channel, and an air outlet of the negative pressure fan is opposite to the air inlet side of the evaporator.
Furthermore, the heat exchange core body and the horizontal plane are obliquely arranged at a certain included angle, a water pan is installed at the bottom of the heat exchange core body, and water of the water pan is drained to the outside of the dryer through a water pipe.
Further, the included angle between the heat exchange core body and the horizontal plane is 10 degrees.
The air source heat pump dryer with the heat recovery comprises the following working steps:
starting an air source heat pump system, wherein refrigerant in an evaporator copper pipe absorbs heat in air and is changed into high-temperature and high-pressure gaseous refrigerant through a compressor, the gaseous refrigerant is liquefied through a condenser to release heat, the released heat is blown out of hot air through a centrifugal fan and is blown into a drying chamber through a lower air duct and a right air duct, and materials are dried;
hot return air in the drying chamber enters a heat exchange core body in the vertical air duct, enters the negative pressure fan through the second air duct and then enters the evaporator, and after the refrigerant in the copper pipe of the evaporator absorbs heat exhausted by the negative pressure fan and is gasified, the heat is continuously transferred into the drying chamber according to the path in the step one;
the fresh air replenished by the fresh air window is subjected to heat exchange with hot return air of the drying chamber through a heat exchange core body through a first air duct, then is transmitted to the air inlet side of the condenser, is heated again through heat released by the condenser, and then is blown out through a centrifugal fan to enter the drying chamber;
and step four, repeating the step one to the step three until the drying is finished.
And in the first step, when the refrigerant in the copper pipe of the evaporator absorbs the heat in the air, the axial flow fan blows out cold air.
Has the advantages that: the hot return air in the drying chamber is recycled, so that on one hand, the hot return air in the drying chamber is transmitted to the evaporator for utilization, the heat waste of the hot air in the drying chamber is avoided, and the environment-friendly and energy-saving effects of heat recycling are achieved; on the other hand, the fresh air is supplemented through the fresh air window, and is transmitted to the condenser for utilization after heat exchange with the hot return air, and the cold air outside is preheated, so that the heat loss of the air source heat pump system is reduced, the heat efficiency of the air source heat pump dryer is improved, the expected temperature can be reached in a low-temperature environment, and the air source heat pump dryer is suitable for use requirements of different environments.
Drawings
In order to more clearly illustrate the air source heat pump dryer with heat recovery of the present invention, the drawings used in the technical description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creating any inventive work.
FIG. 1 is a schematic view of the internal structure of an air source heat pump dryer with heat recovery according to the present invention;
wherein: the air source heat pump system comprises 1-an air source heat pump system, 2-an axial flow fan, 3-an evaporator, 4-a negative pressure fan, 5-a middle partition plate, 6-a second air channel, 7-a first air channel, 8-a fresh air window, 9-a heat exchange core body, 10-a water receiving disc, 11-a vertical air channel, 12-a drying chamber, 13-a right air channel, 14-a lower air channel, 15-a condenser, 16-a centrifugal fan and 17-a compressor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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 obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1: as shown in figure 1, an air source heat pump dryer with heat recovery is characterized in that an air source heat pump system 1 is arranged on the left side in a shell of the dryer, a drying chamber 12 is arranged on the right side, a vertical air duct 11 is arranged between the air source heat pump system 1 and the drying chamber 12, a heat recovery assembly is arranged in the vertical air duct 11, the heat recovery assembly transmits hot return air in the drying chamber 12 to an evaporator 3 for utilization, and simultaneously transmits the hot return air to a condenser 15 for utilization after heat exchange with fresh air.
Specifically, the heat recovery assembly comprises a heat exchange core body 9, one side of the heat exchange core body 9 is connected with a fresh air window 8 through a first air duct 7, the fresh air window 8 is installed right above an air duct 11 and communicated to the outside of the dryer, the other side of the heat exchange core body 9 is connected with a negative pressure fan 4 through a second air duct 6, and the negative pressure fan 4 is aligned to the air inlet side of the evaporator 3.
Specifically, the air source heat pump system 1 comprises an evaporator 3 and an axial flow fan 2 which are positioned above, and a compressor 17, a condenser 15 and a centrifugal fan 16 which are positioned below, wherein the axial flow fan 2 is over against the evaporator 3, the compressor 17 and the condenser 15 are connected through a refrigerant pipeline, the condenser 15 is connected with the centrifugal fan 16, and the centrifugal fan 16 is communicated into the drying chamber 12.
Specifically, the centrifugal fan 16 is communicated with one end of a lower air duct 14, the lower air duct 14 is located below the drying chamber 12 and the vertical air duct 11, the lower air duct 14 is communicated with the drying chamber 12 through a screen, the other end of the lower air duct 14 is connected with a right air duct 13, the right air duct 13 is located on the side of the drying chamber 12, the right air duct 13 is communicated into the drying chamber 12, and the other end of the drying chamber 12 is communicated to the heat exchange core 9 in the air duct 11.
When the dryer works, in a drying and dehumidifying mode, the air source heat pump system 1 is started, the refrigerant in the copper pipe of the evaporator 3 absorbs heat in air, at the moment, the axial flow fan 2 blows out cold air, the cold air is changed into high-temperature and high-pressure gaseous refrigerant through the compressor 17, the gaseous refrigerant is liquefied through the condenser 15 and releases heat, the released heat blows out hot air through the centrifugal fan 16, as shown in the direction of air circulation represented by an arrow shown in fig. 1, the hot air is blown into the drying chamber 12 through the lower air duct 14 and the right air duct 13, the hot air in the lower air duct 14 enters from the bottom of the drying chamber 12 after passing through the screen plate, the hot air in the right air duct 13 enters from the side edge of the drying chamber 12, and the uniform heat collection and drying of materials in the drying chamber are guaranteed.
Hot return air in the drying chamber 12 continuously enters the heat exchange core body 9 in the vertical air duct 11, enters the negative pressure fan 4 through the second air duct 6 and then enters the evaporator 3, and after a refrigerant in a copper pipe of the evaporator 3 absorbs heat exhausted by the negative pressure fan 4 and is gasified, the heat is continuously transferred into the drying chamber 12 according to the path of the first step; meanwhile, the fresh air supplemented by the fresh air window 8 is subjected to heat exchange with hot return air in the drying chamber 12 through the heat exchange core body 9 through the first air duct 7, then is delivered to the air inlet side of the condenser 15, is heated again through heat released by the condenser 15, and then is blown out hot air through the centrifugal fan 16 to enter the drying chamber 12, so that the hot return air is recycled, and the processes are repeated until the drying is completed.
Example 2: the rest of this embodiment is the same as embodiment 1, wherein the negative pressure fan 4 is embedded and fixed on the middle partition plate 5, the middle partition plate 5 is fixed inside the dryer casing, two ends of the negative pressure fan 4 extend out to two sides of the middle partition plate 5, the air inlet of the negative pressure fan 4 is connected with the second air duct 6, and the air outlet of the negative pressure fan 4 is right opposite to the air inlet side of the evaporator 3.
Wherein heat transfer core 9 is personally submitted certain contained angle slope with the level and is put, water collector 10 is installed to heat transfer core 9 bottom, and when hot return air in drying chamber 12 and the new trend of new trend window 8 mends the new trend and carries out cold and hot exchange, reach the dew point of water, can form the comdenstion water, places heat transfer core 9 slope, makes things convenient for hydroenergy enough to flow, and the angle of its slope can set up to 10, and the water-supply pipe of facial make-up communicates to the drying-machine outside at water collector 10 to outside with water drainage to the drying-machine.
Finally, the above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The utility model provides an air source heat pump drying-machine of area heat recovery, includes air source heat pump system (1), its characterized in that: a vertical air channel (11) is arranged between the air source heat pump system (1) and the drying chamber (12), the vertical air channel (11) is respectively communicated with an evaporator (3) and a condenser (15) in the air source heat pump system (1), the vertical air channel (11) is connected with the air inlet side of the condenser (15), hot return air in the drying chamber (12) is transmitted to the evaporator (3) for utilization through a heat recovery assembly in the vertical air channel (11), and meanwhile, the hot return air is transmitted to the condenser (15) for utilization after being subjected to heat exchange with fresh air;
the heat recovery assembly comprises a heat exchange core body (9), one side of the heat exchange core body (9) is connected with a fresh air window (8) through a first air channel (7), the fresh air window (8) is installed right above a vertical air channel (11) and communicated to the outside of the drying machine, the other side of the heat exchange core body (9) is connected with a negative pressure fan (4) through a second air channel (6), and the negative pressure fan (4) is aligned to the air inlet side of the evaporator (3).
2. The air-source heat pump dryer with heat recovery of claim 1, wherein: the air source heat pump system (1) comprises an evaporator (3) and an axial flow fan (2) which are located above, and a compressor (17), a condenser (15) and a centrifugal fan (16) which are located below, wherein the axial flow fan (2) is over against the evaporator (3), the compressor (17) and the condenser (15) are connected through a refrigerant pipeline, the condenser (15) is connected with the centrifugal fan (16), and the centrifugal fan (16) is communicated into a drying chamber (12).
3. The air-source heat pump dryer with heat recovery of claim 2, wherein: the centrifugal fan (16) is communicated with one end of a lower air duct (14), the lower air duct (14) is located below the drying chamber (12) and the vertical air duct (11), the lower air duct (14) is communicated with the drying chamber (12) through a screen plate, the other end of the lower air duct (14) is connected with a right air duct (13), the right air duct (13) is located on the side edge of the drying chamber (12), and the right air duct (13) is communicated into the drying chamber (12).
4. The air-source heat pump dryer with heat recovery of claim 3, wherein: the other side of the drying chamber (12) is communicated to the heat exchange core body (9) in the vertical air duct (11).
5. The air-source heat pump dryer with heat recovery of claim 1, wherein: the negative pressure fan (4) is embedded and fixed on the middle partition plate (5), the air inlet of the negative pressure fan (4) is connected with the second air duct (6), and the air outlet of the negative pressure fan (4) is opposite to the air inlet side of the evaporator (3).
6. The air-source heat pump dryer with heat recovery of claim 1, wherein: the heat exchange core body (9) is obliquely placed at a certain included angle with the horizontal plane, a water pan (10) is installed at the bottom of the heat exchange core body (9), and water of the water pan (10) is drained to the outside of the dryer through a water pipe.
7. The air-source heat pump dryer with heat recovery of claim 6, wherein: the included angle between the heat exchange core body (9) and the horizontal plane is 10 degrees.
8. The air-source heat pump dryer with heat recovery of any one of claims 1-7, wherein: the operating steps of the dryer include:
the method comprises the steps that firstly, an air source heat pump system (1) is started, refrigerant in a copper pipe of an evaporator (3) absorbs heat in air, the refrigerant is changed into high-temperature and high-pressure gaseous refrigerant through a compressor (17), the gaseous refrigerant is liquefied through a condenser (15) to release the heat, the released heat blows hot air through a centrifugal fan (16), and the hot air is blown into a drying chamber (12) through a lower air duct (14) and a right air duct (13) to dry materials;
hot return air in the drying chamber (12) in the second step enters a heat exchange core body (9) in a vertical air duct (11), enters the negative pressure fan (4) through a second air duct (6) and then enters the evaporator (3), and after a refrigerant in a copper pipe of the evaporator (3) absorbs heat exhausted by the negative pressure fan (4) and is gasified, the heat is continuously transferred into the drying chamber (12) according to the path in the first step;
the fresh air supplemented by the fresh air window (8) in the third step is subjected to heat exchange with hot return air of the drying chamber (12) through a heat exchange core (9) through a first air duct (7), then is transmitted to the air inlet side of the condenser (15), is heated again through heat released by the condenser (15), and then is blown out of hot air through a centrifugal fan (16) to enter the drying chamber (12);
and step four, repeating the step one to the step three until the drying is finished.
9. The air-source heat pump dryer with heat recovery of claim 8, wherein: and in the first step, when the refrigerant in the copper pipe of the evaporator (3) absorbs the heat in the air, the axial flow fan (2) blows out cold air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110974183.7A CN113720113A (en) | 2021-08-24 | 2021-08-24 | Air source heat pump dryer with heat recovery function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110974183.7A CN113720113A (en) | 2021-08-24 | 2021-08-24 | Air source heat pump dryer with heat recovery function |
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| CN113720113A true CN113720113A (en) | 2021-11-30 |
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| CN202110974183.7A Pending CN113720113A (en) | 2021-08-24 | 2021-08-24 | Air source heat pump dryer with heat recovery function |
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| CN212133096U (en) * | 2020-04-21 | 2020-12-11 | 云南昆船烟草设备有限公司 | Split type high temperature heat pump drying device |
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2021
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| RU2102662C1 (en) * | 1995-12-07 | 1998-01-20 | Николай Георгиевич Конопасов | Recirculating drying plant |
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| CN212133096U (en) * | 2020-04-21 | 2020-12-11 | 云南昆船烟草设备有限公司 | Split type high temperature heat pump drying device |
| CN111664657A (en) * | 2020-06-11 | 2020-09-15 | 青岛科技大学 | Heat pump drying chamber |
| CN112229166A (en) * | 2020-11-14 | 2021-01-15 | 玉溪新天力农业装备制造有限公司 | Integrative lower air supply formula drying-machine of air source heat pump switching |
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