CN111637624A - Low-temperature grain heat pump air heater - Google Patents
Low-temperature grain heat pump air heater Download PDFInfo
- Publication number
- CN111637624A CN111637624A CN202010411477.4A CN202010411477A CN111637624A CN 111637624 A CN111637624 A CN 111637624A CN 202010411477 A CN202010411477 A CN 202010411477A CN 111637624 A CN111637624 A CN 111637624A
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- CN
- China
- Prior art keywords
- heat pump
- pump system
- low
- condenser
- evaporation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001704 evaporation Methods 0.000 claims abstract description 32
- 230000008020 evaporation Effects 0.000 claims abstract description 32
- 238000009833 condensation Methods 0.000 claims abstract description 23
- 230000005494 condensation Effects 0.000 claims abstract description 23
- 235000013339 cereals Nutrition 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000005057 refrigeration Methods 0.000 claims description 5
- 238000010257 thawing Methods 0.000 abstract description 27
- 238000001035 drying Methods 0.000 description 9
- 239000003507 refrigerant Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
- F24H3/08—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/06—Air heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
-
- 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- 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
- F25B47/022—Defrosting cycles hot gas defrosting
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Defrosting Systems (AREA)
Abstract
The invention discloses a low-temperature grain heat pump air heater which comprises a rack, a condensation air channel arranged on the rack, an evaporation air channel arranged on the rack and a heat pump system arranged on the rack. Meanwhile, other heat pump systems still work continuously, and higher temperature can be provided for the condenser of the defrosting heat pump system, so that the temperature rise of the evaporator of the defrosting heat pump system is accelerated, and the defrosting efficiency is further improved.
Description
Technical Field
The invention relates to a low-temperature grain heat pump air heater.
Background
The grain dryer is used for drying moisture in grains and is an important device in grain machinery. Generally, a grain dryer adopts electric heating or adopts warm air to heat grains after a compressor heats the grains for drying, wherein the compressor is adopted for heating, so that the energy is saved, and the grain dryer is a mainstream in the existing grain drying equipment. However, in a low-temperature environment, defrosting of an evaporator is a technical problem in the existing grain drying equipment, if heating defrosting is carried out without stopping the equipment, the effect is poor, and although the stopping defrosting effect is good, the drying of grains can be affected.
Therefore, a low-temperature grain heat pump air heater with a good defrosting effect is needed at present.
Disclosure of Invention
The invention aims to provide a low-temperature grain heat pump air heater with a good defrosting effect.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a low temperature type cereal heat pump air heater, it includes the frame, sets up condensation wind channel, setting in the frame are in evaporation wind channel and setting in the frame are in heat pump system in the frame, heat pump system is including setting up condenser, setting in the condensation wind channel are in evaporimeter in the evaporation wind channel, be used for switching the condenser with the four-way reversing valve and the drive of evaporimeter refrigeration heating function the condenser the evaporimeter refrigeration or the heat pump subassembly that heats, heat pump system independently is provided with three groups at least, the evaporation wind channel has two at least, every all be provided with an evaporimeter in the evaporation wind channel at least.
Preferably, the condensation air duct is provided with one, and the plurality of condensers of the heat pump system are sequentially arranged in the condensation air duct.
Preferably, the heat pump system at least comprises a first heat pump system, a second heat pump system and a third heat pump system, condensers of the first heat pump system and the second heat pump system are arranged together in a heat exchange manner, evaporators of the first heat pump system and the second heat pump system are arranged in the same evaporation air duct in a heat exchange manner, and an evaporator of the third heat pump system is arranged in the other air duct.
Further preferably, the condensers of the first and second heat pump systems are disposed at the front ends of the other condensers.
Further preferably, the system further comprises a fourth heat pump system, and an evaporator of the fourth heat pump system and an evaporator of the third heat pump system are arranged together in a heat exchange manner.
Preferably, the rack is provided with two layers, the condensation air duct is arranged on the lower layer of the rack, and the evaporation air duct is arranged on the upper layer of the rack.
Preferably, the inlet end of the condensation air duct is provided with a heater.
Preferably, the outlet end of the condensation air duct is provided with an air valve for adjusting the flow.
Preferably, the evaporation air ducts are mutually independent, and a heat exchange fan is arranged at the outlet end of each evaporation air duct.
Preferably, the heat pump assembly includes a heat pump circuit connecting the condenser and the condenser, a compressor and an expansion valve provided in the heat pump circuit.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
because the invention is provided with at least two evaporation air channels, when the evaporator in the evaporation air channel is frosted, the four-way reversing valve of a single heat pump system can be driven to defrost the evaporator in the single evaporation air channel, and the grain drying equipment does not need to be stopped.
Meanwhile, other heat pump systems still work continuously, and higher temperature can be provided for the condenser of the defrosting heat pump system, so that the temperature rise of the evaporator of the defrosting heat pump system is accelerated, and the defrosting efficiency is further improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment;
fig. 2 is a schematic diagram of a single heat pump system.
In the above drawings: 1. a frame; 2. a condensation air duct; 3. an evaporation air duct; 4. a condenser; 4a, a first condenser; 4b, a second condenser; 4c, a third condenser; 5. an evaporator; 6. a four-way reversing valve; 7. a compressor; 8a, 8b, an expansion valve; 9a, 9b, a reservoir; 10. drying the filter; 11. a plate heat exchanger; 12. a heat exchange fan; 13. a heater.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings to which:
referring to the attached drawing 1, the low-temperature grain heat pump air heater comprises a rack 1, a condensation air duct 2 arranged on the rack 1, an evaporation air duct 3 arranged on the rack 1, and a heat pump system arranged on the rack 1, wherein the heat pump system comprises a condenser 4 arranged in the condensation air duct 2, an evaporator 5 arranged in the evaporation air duct 3, a four-way reversing valve 6 for switching the refrigerating and heating functions of the condenser 4 and the evaporator 5, and a heat pump assembly for driving the condenser 4 and the evaporator 5 to refrigerate or heat.
Referring to fig. 2, the heat pump system adopts an existing compressor refrigeration and heating circuit, and specifically, each heat pump system comprises a condenser 4, an evaporator 5, a four-way reversing valve 6, and a heat pump circuit connected with the condenser, the evaporator and the four-way reversing valve, and a compressor 7, expansion valves 8a and 8b, liquid accumulators 9a and 9b, a dry filter 10 and a plate heat exchanger 11 (economizer) are further arranged in the heat pump circuit. The heat pump system has a heating mode of heating by a conventional condenser 4 and a defrosting mode of heating by an evaporator 5, a refrigerant is compressed by a compressor 7 in the heating mode to become high-temperature and high-pressure gas, the high-temperature and high-pressure gas enters the condenser 4 to release heat, the released heat is used for heating grains, the refrigerant becomes medium-temperature and high-pressure liquid after being released by the condenser, and then is divided into two paths, a main path refrigerant enters a plate heat exchanger 11, an auxiliary path refrigerant enters the plate heat exchanger 11 after passing through an expansion valve 8b (the expansion valve 8b is opened at normal temperature when the ambient temperature is low) to exchange heat with the main path refrigerant to become low-pressure gas, the low-pressure gas enters an air supplementing and enthalpy increasing port of the compressor, the main path refrigerant becomes subcooled liquid after being exchanged heat, passes through a liquid reservoir 9a and a drying filter 10, is throttled by the expansion, the energy is absorbed from the outside air and then becomes low-pressure low-temperature gas which returns to the compressor, and a heating cycle is completed. The switching between the heating mode and the defrosting mode is realized by switching the four-way reversing valve 6.
In this embodiment, four groups of heat pump systems are independently provided, which are a first heat pump system, a second heat pump system, a third heat pump system, and a fourth heat pump system.
Two evaporation air channels 3 are provided, and two evaporators 5 are arranged in each evaporation air channel 3; the condensation air duct 2 is provided with one, and the three condensers 4 are arranged in the condensation air duct 2 in sequence.
Specifically, the three condensers 4 include a first condenser 4a, a second condenser 4b and a third condenser 4c, and the first condenser 4a includes two mutually independent condensing pipelines that exchange heat with each other.
Wherein the evaporators 5 of the first and second heat pump systems are arranged in the same evaporation air duct 3, and both share the first condenser 4 a. The evaporators 5 of the third and fourth heat pump systems are disposed in the other evaporation air duct 3, and both use the second condenser 4b and the third condenser 4c, respectively.
When the first heat pump system needs defrosting, the second heat pump system is suspended, the four-way reversing valve 6 of the first heat pump system is adjusted, so that the first heat pump system is in a defrosting mode of refrigerating in the condenser 4 and heating in the evaporator 5, and the third heat pump system and the fourth heat pump system are still kept in a heating mode at the moment.
Similarly, when the second heat pump system enters the defrosting mode, the first heat pump system is suspended, and the third heat pump system and the fourth heat pump system are kept in the heating mode.
When the third heat pump system enters the defrosting mode, the fourth heat pump system is suspended, and the first heat pump system and the second heat pump system are kept in the heating mode.
When the fourth heat pump system enters the defrosting mode, the third heat pump system is suspended, and the first heat pump system and the second heat pump system are kept in the heating mode.
Because when a certain heat pump system is in the defrosting mode, the other two heat pump systems are in the heating mode all the time, the grain drying equipment does not need to be stopped during defrosting.
Meanwhile, other heat pump systems still work continuously, and can provide higher temperature for the condenser 4 of the defrosting heat pump system to accelerate the temperature rise of the evaporator 5 of the defrosting heat pump system so as to further improve the defrosting efficiency.
In this embodiment, the first heat pump system and the second heat pump system use R410A (boiling point-51.6 ℃) as a refrigerant, the third heat pump system and the fourth heat pump system use R134A (boiling point-26.1 ℃) as a refrigerant, and the condenser 4a closer to the front needs a refrigerant with a lower boiling point to ensure the working performance, and when the first heat pump system or the second heat pump system defrosts, the compressor 7 of the third heat pump system and the fourth heat pump system enters a low-pressure protection shield to protect the compressor 7 of the third heat pump system and the fourth heat pump system.
The frame 1 of this implementation is provided with two-layer, and condensation wind channel 2 sets up in the lower floor of frame 1, and evaporation wind channel 3 is located the upper strata of frame 1. The outlet end of the condensation air duct 2 is provided with a fan and an air valve for adjusting the flow. The two evaporation air channels 3 are mutually independent, the outlet ends of the two evaporation air channels 3 are respectively provided with a heat exchange fan 12, and when an evaporator in a certain evaporation air channel 3 needs defrosting, the rotation of the heat exchange fan 12 of the evaporation air channel 3 is suspended so as to improve the defrosting efficiency.
In order to further ensure that the defrosting can be performed at a low temperature, the present embodiment is provided with a heater 13 at the inlet end of the condensation air duct 2, and when the ambient temperature is too low, the temperature of the air entering the condenser 4 is preheated, so as to ensure that the heat pump can perform quick defrosting.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The utility model provides a low temperature type cereal heat pump air heater, it includes the frame, sets up condensation wind channel, setting in the frame are in evaporation wind channel and setting in the frame are in heat pump system in the frame, heat pump system is including setting up condenser, setting in the condensation wind channel are in evaporimeter in the evaporation wind channel, be used for switching the condenser with the four-way reversing valve and the drive of evaporimeter refrigeration heating function the condenser the evaporimeter refrigeration or the heat pump subassembly that heats its characterized in that: the heat pump system is at least provided with three groups independently, the number of the evaporation air channels is at least two, and each evaporation air channel is internally provided with at least one evaporator.
2. The low-temperature grain heat pump hot air blower according to claim 1, wherein: the condensation wind channel is provided with one, and a plurality of heat pump system's condenser sets gradually in the condensation wind channel.
3. The low-temperature grain heat pump hot air blower according to claim 1, wherein: the heat pump system at least comprises a first heat pump system, a second heat pump system and a third heat pump system, condensers of the first heat pump system and the second heat pump system are arranged together in a heat exchange mode, evaporators of the first heat pump system and the second heat pump system are arranged in the same evaporation air channel in a heat exchange mode, and an evaporator of the third heat pump system is arranged in the other air channel.
4. The low-temperature grain heat pump hot air blower according to claim 3, wherein: the condensers of the first heat pump system and the second heat pump system are arranged at the front ends of the other condensers.
5. The low-temperature grain heat pump hot air blower according to claim 4, wherein: the heat pump system further comprises a fourth heat pump system, and an evaporator of the fourth heat pump system and an evaporator of the third heat pump system are arranged together in a heat exchange mode.
6. The low-temperature grain heat pump hot air blower according to claim 1, wherein: the frame is provided with two layers, the condensation air duct is arranged on the lower layer of the frame, and the evaporation air duct is arranged on the upper layer of the frame.
7. The low-temperature grain heat pump hot air blower according to claim 1, wherein: and a heater is arranged at the inlet end of the condensation air channel.
8. The low-temperature grain heat pump hot air blower according to claim 1, wherein: and an air valve for adjusting the flow is arranged at the outlet end of the condensation air channel.
9. The low-temperature grain heat pump hot air blower according to claim 1, wherein: the evaporation air channels are mutually independent, and a heat exchange fan is arranged at the outlet end of each evaporation air channel.
10. The low-temperature grain heat pump hot air blower according to claim 1, wherein: the heat pump assembly comprises a heat pump loop connecting the condenser and the condenser, and a compressor and an expansion valve arranged in the heat pump loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010411477.4A CN111637624A (en) | 2020-05-15 | 2020-05-15 | Low-temperature grain heat pump air heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010411477.4A CN111637624A (en) | 2020-05-15 | 2020-05-15 | Low-temperature grain heat pump air heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111637624A true CN111637624A (en) | 2020-09-08 |
Family
ID=72330837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010411477.4A Pending CN111637624A (en) | 2020-05-15 | 2020-05-15 | Low-temperature grain heat pump air heater |
Country Status (1)
| Country | Link |
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| CN (1) | CN111637624A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2778970A1 (en) * | 1998-05-25 | 1999-11-26 | Austria Haus Technik Aktienges | Deicing evaporators of refrigeration equipment and/or heat pumps |
| JP2007333377A (en) * | 2007-08-24 | 2007-12-27 | Kimura Kohki Co Ltd | Heat pump type air conditioner |
| CN201555424U (en) * | 2009-10-23 | 2010-08-18 | 吴伯英 | Heat pump circulatory dehumidification barn |
| CN107270697A (en) * | 2017-07-18 | 2017-10-20 | 合肥万都云雅制冷科技股份有限公司 | A kind of novel heat pump air-heater |
| CN107621129A (en) * | 2017-08-24 | 2018-01-23 | 上海伯涵热能科技有限公司 | A kind of drying unit of outer thermal starting and depth dehumidifying |
| CN110131804A (en) * | 2019-06-17 | 2019-08-16 | 广东石油化工学院 | A kind of double refrigeration system cooling and dehumidifying units |
| CN212299860U (en) * | 2020-05-15 | 2021-01-05 | 苏州苏净安发空调有限公司 | Low-temperature grain heat pump air heater |
-
2020
- 2020-05-15 CN CN202010411477.4A patent/CN111637624A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2778970A1 (en) * | 1998-05-25 | 1999-11-26 | Austria Haus Technik Aktienges | Deicing evaporators of refrigeration equipment and/or heat pumps |
| JP2007333377A (en) * | 2007-08-24 | 2007-12-27 | Kimura Kohki Co Ltd | Heat pump type air conditioner |
| CN201555424U (en) * | 2009-10-23 | 2010-08-18 | 吴伯英 | Heat pump circulatory dehumidification barn |
| CN107270697A (en) * | 2017-07-18 | 2017-10-20 | 合肥万都云雅制冷科技股份有限公司 | A kind of novel heat pump air-heater |
| CN107621129A (en) * | 2017-08-24 | 2018-01-23 | 上海伯涵热能科技有限公司 | A kind of drying unit of outer thermal starting and depth dehumidifying |
| CN110131804A (en) * | 2019-06-17 | 2019-08-16 | 广东石油化工学院 | A kind of double refrigeration system cooling and dehumidifying units |
| CN212299860U (en) * | 2020-05-15 | 2021-01-05 | 苏州苏净安发空调有限公司 | Low-temperature grain heat pump air heater |
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| CB02 | Change of applicant information |
Country or region after: China Address after: 2 Weixin Road, Suzhou Industrial Park, Jiangsu Province Applicant after: Suzhou Sujing Anfa Environmental Technology Co.,Ltd. Address before: 2 Weixin Road, Suzhou Industrial Park, Jiangsu Province Applicant before: SUZHOU SUJING AIM FAR AIR CONDITIONING Co.,Ltd. Country or region before: China |