CN216620376U - Synchronous defroster of air source heat pump for grain is dried - Google Patents
Synchronous defroster of air source heat pump for grain is dried Download PDFInfo
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- CN216620376U CN216620376U CN202123116171.5U CN202123116171U CN216620376U CN 216620376 U CN216620376 U CN 216620376U CN 202123116171 U CN202123116171 U CN 202123116171U CN 216620376 U CN216620376 U CN 216620376U
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Abstract
The utility model discloses an air source heat pump synchronous defrosting device for grain drying, which belongs to the field of grain processing equipment and comprises a first compressor, a condenser, a first throttling valve, an evaporator, an axial flow fan, a second compressor and a second throttling valve, wherein the first compressor, the condenser, the first throttling valve and the evaporator are connected through pipelines to form a first circulating system; the axial flow fan is arranged on one side of the evaporator, the four-way valve is further arranged in the second circulating system, the four-way valve is connected with the second compressor, the condenser and the evaporator through pipelines, and when defrosting is needed, the four-way valve works tangentially to enable the condensation heat of the condenser to be supplied to the evaporator in a reversing mode, and heat is provided for defrosting of the evaporator. The circulation system pipeline of the device is simple and easy to realize, the heat pump system can realize synchronous defrosting when heating normally, the stability of the system operation is ensured, and the device is suitable for being applied in a grain drying system.
Description
Technical Field
The utility model relates to the field of grain processing equipment, in particular to an air source heat pump defrosting device.
Background
The common heat pump drying technology for grain drying can furthest retain nutrient components in dried substances without damaging the original structure, and remove moisture through high-temperature treatment to meet the grain storage requirement. However, when the air-source heat pump is operated in a low temperature environment, ambient air may be frosted on the evaporator surface. The heat conductivity coefficient of the frost layer is very low, the thicker the evaporator is frosted, the more the heat absorption capacity is reduced, so the superheat degree of the outlet of the evaporator is reduced, the expansion valve is automatically closed, the evaporation pressure is reduced, the refrigerating capacity and the refrigerating coefficient of the device are reduced, even the storage temperature does not reach the lower limit, the compressor is stopped because the suction pressure is too low, and for the air cooler, the thicker the frost layer can block the channels among the fins, so that the air flow is reduced. Therefore, when the evaporator frost layer reaches a certain thickness (about 3mm for the evaporating coil), it is necessary to defrost.
Among the prior art, cross valve tangential defrosting is a common mode, has the fast advantage of defrosting, nevertheless in the work of defrosting heat pump system need halt temporarily, and the heat supply is given drying system for the pause, leads to air supply temperature unstable, influences heat pump set's work efficiency. Also have the device that external heating equipment auxiliary heating defrosted among the prior art, the heat scatters and disappears when external heating equipment uses much, and is relatively poor to the effect of heating of evaporimeter department, still additionally increases energy resource consumption, and the pipeline ageing still can have the potential safety hazard for a long time, causes the inconvenience for the use.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provide the air source heat pump synchronous defrosting device for grain drying, which realizes synchronous defrosting while a heat pump system heats normally and ensures the stability of system operation.
The purpose of the utility model is realized by the following steps: an air source heat pump synchronous defrosting device for grain drying comprises a first compressor, a condenser, a first throttle valve, an evaporator, an axial flow fan, a second compressor and a second throttle valve, wherein the first compressor, the condenser, the first throttle valve and the evaporator are connected through pipelines to form a first circulating system, and the second compressor, the condenser, the second throttle valve and the evaporator are connected through pipelines to form a second circulating system; the axial flow fan is arranged on one side of the evaporator, a four-way valve is further arranged in the second circulating system, the four-way valve is connected with the second compressor, the condenser and the evaporator through pipelines, when defrosting is needed, the four-way valve works tangentially to enable condensation heat of the condenser to be supplied to the evaporator in a reversing mode, and heat is provided for defrosting of the evaporator.
The utility model is provided with two groups of circulating systems, and the four-way valve is arranged in the second circulating system to change the condensation heat of the second circulating system to the evaporator in defrosting, thereby providing heat for defrosting of the evaporator. Compared with the prior art, when defrosting is carried out, the first circulating system operates normally without stopping to continuously provide stable heat for drying grains, and the stability and reliability of the operation of the system are ensured; when defrosting is not needed at the evaporator, the two groups of circulating systems provide heat for drying the grains together, so that the drying efficiency is improved; the system has simple circulation pipeline, is easy to realize, and is suitable for being applied in a grain drying system.
Furthermore, the four-way valve is arranged between a connecting pipeline of the second compressor and the condenser, the outlet of the second compressor is connected with the first interface of the four-way valve and is connected with the condenser through the second interface of the four-way valve, when defrosting is carried out in a tangential direction, the outlet of the second compressor is connected with the first interface of the four-way valve, flows out through the third interface of the four-way valve and enters the evaporator through a pipeline for energy supply and defrosting, and then is sequentially connected with the second throttling valve, the condenser, the second interface of the four-way valve, the fourth interface of the four-way valve and the inlet of the second compressor through pipelines, so that the defrosting cycle action is completed.
Furthermore, the evaporator is a fin evaporator, the contact area of the fin design is large, and the heat exchange efficiency is high.
Drawings
Fig. 1 is a schematic view of the operation of the heat pump system of the present invention in a heating mode;
fig. 2 is a schematic view of the operation of the heat pump system of the present invention in the defrost mode.
In the above figure, 1 a condenser, 2 a second throttle valve, 3 a four-way valve, 301 a first interface of the four-way valve, 302 a second interface of the four-way valve, 303 a third interface of the four-way valve, 304 a fourth interface of the four-way valve, 4 a second compressor, 5 an evaporator, 6 an axial flow fan, 7 a first compressor, and 8 a first throttle valve.
Detailed Description
As shown in fig. 1-2, the air source heat pump synchronous defrosting device for drying grain comprises a first compressor 7, a condenser 1, a first throttle valve 8, an evaporator 5, an axial flow fan 6, a second compressor 4 and a second throttle valve 2, wherein the first compressor 7, the condenser 1, the first throttle valve 8 and the evaporator 5 are connected through a pipeline to form a first circulating system, and the second compressor 4, the condenser 1, the second throttle valve 2 and the evaporator 5 are connected through a pipeline to form a second circulating system; the axial flow fan 6 is arranged on one side of the evaporator 5, the four-way valve 3 is further arranged in the second circulating system, the four-way valve 3 is connected with the second compressor 4, the condenser 1 and the evaporator 5 through pipelines, and when defrosting is needed, the four-way valve 3 works tangentially to enable condensation heat of the condenser 1 to be supplied to the evaporator 5 in a heat exchange mode, and heat is provided for defrosting of the evaporator 5.
The four-way valve 3 is arranged between the connecting pipelines of the second compressor 4 and the condenser 1, the outlet of the second compressor 4 is connected with the first interface 301 of the four-way valve, and is connected with the condenser 1 through the second interface 302 of the four-way valve, when defrosting in a tangential direction, the outlet of the second compressor 4 is connected with the first interface 301 of the four-way valve, flows out through the third interface 303 of the four-way valve and enters the evaporator 5 through a pipeline for energy supply and defrosting, and then is sequentially connected with the second throttle valve 2, the condenser 1, the second interface 302 of the four-way valve, the fourth interface 304 of the four-way valve and the inlet of the second compressor 4 through pipelines, and the defrosting cycle action is completed.
The evaporator 5 is a fin evaporator, the contact area of the fin design is large, and the heat exchange efficiency is high.
In the heating mode, as shown in fig. 1, low-temperature and low-pressure refrigerant vapor respectively flows into a first compressor 7 and a second compressor 4 through pipelines, is converted into high-temperature and high-pressure vapor through compression, then enters a condenser 1 through the pipelines for heat exchange, generated high-temperature hot air is used for drying grains, the high-temperature and high-pressure refrigerant vapor is condensed into liquid, the liquid respectively flows into an evaporator through a first throttling valve 8 and a second throttling valve 2 through the pipelines, and then respectively flows into the first compressor 7 and the second compressor 4 through the pipelines, and the reciprocating circulation is used for continuously and stably providing heat for the grain drying; under the defrosting mode, as shown in fig. 2, the normal circulation of first circulation system heats and provides high-temperature hot air for grain is dried, continuously provide the stable heat, guarantee the stability and the reliability of system operation, the condensation heat of second circulation system supplies evaporimeter 5 through the 3 switching-over of cross valve, for evaporimeter 5 defrosting provides the heat, in the defrosting in-process, the air-out temperature of condenser 1 one side descends to some extent still is higher than the air supply temperature when traditional tangential defrosting far away, the circulation system pipeline of this device is simple easily to realize, realize synchronous defrosting when heat pump system normally heats, guarantee the stability of system operation, it uses in grain drying system to be suitable.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (3)
1. The utility model provides a synchronous defroster of air source heat pump for grain is dried, includes first compressor, condenser, first choke valve, evaporimeter, axial fan, second compressor and second choke valve, its characterized in that: the first compressor, the condenser, the first throttle valve and the evaporator are connected through pipelines to form a first circulating system, and the second compressor, the condenser, the second throttle valve and the evaporator are connected through pipelines to form a second circulating system; the axial flow fan is arranged on one side of the evaporator, a four-way valve is further arranged in the second circulating system, the four-way valve is connected with the second compressor, the condenser and the evaporator through pipelines, when defrosting is needed, the four-way valve works tangentially to enable condensation heat of the condenser to be supplied to the evaporator in a reversing mode, and heat is provided for defrosting of the evaporator.
2. The air source heat pump synchronous defrosting device for grain drying according to claim 1, characterized in that: the four-way valve is arranged between the connecting pipeline of the second compressor and the condenser, the outlet of the second compressor is connected with the first interface of the four-way valve and is connected with the condenser through the second interface of the four-way valve, when defrosting is carried out in a tangential direction, the outlet of the second compressor is connected with the first interface of the four-way valve, flows out through the third interface of the four-way valve and enters the evaporator through a pipeline for energy supply and defrosting, and then is sequentially connected with the second throttling valve, the condenser, the second interface of the four-way valve, the fourth interface of the four-way valve and the inlet of the second compressor through pipelines, so that the defrosting cycle action is completed.
3. The air source heat pump synchronous defrosting device for grain drying according to claim 1, characterized in that: the evaporator is a fin evaporator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123116171.5U CN216620376U (en) | 2021-12-13 | 2021-12-13 | Synchronous defroster of air source heat pump for grain is dried |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123116171.5U CN216620376U (en) | 2021-12-13 | 2021-12-13 | Synchronous defroster of air source heat pump for grain is dried |
Publications (1)
| Publication Number | Publication Date |
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| CN216620376U true CN216620376U (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123116171.5U Active CN216620376U (en) | 2021-12-13 | 2021-12-13 | Synchronous defroster of air source heat pump for grain is dried |
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| CN (1) | CN216620376U (en) |
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2021
- 2021-12-13 CN CN202123116171.5U patent/CN216620376U/en active Active
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