CN210512252U - Air source heat pump evaporator capable of delaying frosting and air source heat pump - Google Patents
Air source heat pump evaporator capable of delaying frosting and air source heat pump Download PDFInfo
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- CN210512252U CN210512252U CN201921167515.5U CN201921167515U CN210512252U CN 210512252 U CN210512252 U CN 210512252U CN 201921167515 U CN201921167515 U CN 201921167515U CN 210512252 U CN210512252 U CN 210512252U
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Abstract
The utility model provides a can delay air source heat pump evaporimeter and air source heat pump of frosting for it is very fast to solve prior art cavity air source heat pump set cavity air source heat pump evaporimeter fin surface frosting speed, and the frost layer blocks up the problem that passageway speed is very fast, defrosting cycle is short. The air conditioner comprises a refrigerant pipeline and a plurality of fins which are serially arranged on the refrigerant pipeline, wherein a refrigerant-free slow cooling fin head which can guide the liquefaction but not the desublimation of vapor in air is arranged on the windward side of each fin, and the refrigerant pipeline is not arranged on the refrigerant-free slow cooling fin head. The coolerless slow cooling fin head ensures that water vapor in the air is frozen without frosting, so that the aims of prolonging the defrosting period, reducing the defrosting energy consumption and improving the overall performance of the unit are fulfilled. The utility model discloses the defrosting cycle of air source heat pump evaporator under same operating mode and defrosting condition is about three original times. The utility model has the advantages of simple and reasonable structure, it is with low costs, realize easily, do not have the influence to the normal operating of system.
Description
Technical Field
The utility model relates to a defrosting and delay the frosting field, specifically relate to an air source heat pump evaporimeter and air source heat pump that can delay frosting.
Background
In recent years, with the improvement of living standard of people and the national emphasis on environmental protection, energy conservation and emission reduction, the air source heat pump unit is widely used as an energy-saving device. The air source heat pump unit mainly comprises an evaporator, a compressor, a condenser and a throttling device, and the refrigerant continuously completes the thermodynamic cycle processes of evaporation (absorbing heat in the external environment), compression-condensation (releasing heat), throttling and evaporation, so that the heat absorbed from the external environment is transferred to water or air for heating. The biggest problem of the air source heat pump unit in winter heating operation is frosting on the surface of an evaporator fin. Due to the formation and growth of the frost layer, the heat transfer resistance between the surface of the evaporator fin and the air is increased, the flow resistance of airflow passing through the evaporator fin is increased, the airflow passing through the evaporator fin is reduced, the heat exchange efficiency is obviously reduced, the heat exchange quantity between the air and the evaporator is reduced, the working condition of the heat pump unit is deteriorated, even the heat pump unit cannot normally work, defrosting is needed at the moment, the output capacity of the whole air source heat pump unit is greatly reduced in the defrosting process, extra energy is consumed in the defrosting process, the running cost is greatly increased, and therefore, the defrosting period is an important means for improving the comprehensive performance and stability of the air source heat pump in winter.
At present, the main defrosting period can be prolonged by the following frost delaying mode:
and (3) delaying frosting by-pass hot gas: the bypass is arranged at the exhaust port of the compressor, the electromagnetic valve is arranged on the bypass pipeline, the controller adjusts the opening degree of the electromagnetic valve, namely, the flow of high-temperature and high-pressure gas flowing from the exhaust port of the compressor to the gas circulation port of the outdoor heat exchanger is controlled, the gas pressure of the gas circulation port is larger than or equal to a set gas pressure value P0, therefore, the pressure of the gas circulation port of the outdoor heat exchanger can be always kept in a higher range, the internal pressure of an outdoor evaporator is larger, the surface temperature of the whole evaporator is higher, and the frosting of an outdoor unit is effectively delayed.
Evaporator surface modification and frost inhibition: the frosting degree is reduced by adopting ultrasonic waves or super-hydrophobic surface coatings, but the method has higher cost and complex process and is not beneficial to industrial production.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defect and not enough of prior art, the utility model provides a can delay air source heat pump evaporimeter and air source heat pump that frosts for it is very fast to solve prior art air source heat pump set air source heat pump evaporimeter fin surface frosting speed, and the frost layer blocks up the problem that passageway speed is very fast, defrosting cycle is short.
The utility model provides an air source heat pump evaporimeter that can delay frosting, be in including refrigerant pipeline and cluster dress a plurality of fins on the refrigerant pipeline the windward side of fin is provided with the no refrigerant slow cooling fin head that can guide vapor liquefaction in the air but not desublimation, do not install on the no refrigerant slow cooling fin head the refrigerant pipeline.
Preferably, the coolant-free slow cooling fin head is provided with a plurality of through holes which penetrate along the thickness direction of the fin.
Preferably, the coolerless slow cooling fin head and the fins are of an integrated structure.
Preferably, the coolerless slow cooling fin is made of a material with a thermal conductivity of less than 237 w/m-k.
Preferably, the coolant-free slow cooling fin head is coated with a coating capable of reducing the heat conductivity coefficient of the coolant-free slow cooling fin head.
Preferably, the coolant-free slow cooling fin head is provided with a slow cooling structure for increasing the slow cooling distance.
The utility model also provides an air source heat pump that can prolong defrosting cycle, including compressor, condenser and throttling arrangement, still contain above-mentioned arbitrary air source heat pump evaporimeter.
The utility model discloses air source heat pump evaporator and air source heat pump, it is provided with the guide structure of guide air vapor liquefaction but not desublimation in the windward side, the guide structure need be passed before the air admission fin, when the air admission guide structure, make vapor liquefaction water, and become ice by water condensation when follow-up through the fin, can avoid the direct desublimation of vapor to become the frost of many frost nucleuses on the one hand (the frost is the dendritic ice crystal of approximate snowflake form, the roughness is higher, the frost nucleuses is more), the frost velocity that leads to accelerates, the volume after the liquefaction water becomes ice again reduces greatly for the volume after the frost by the direct desublimation of vapor, thereby it is long when the jam of fin has been increased, the cycle of defrosting has been increased greatly. The utility model discloses the defrosting cycle of air source heat pump evaporimeter under same operating mode and defrosting condition is about original triple, has prolonged the defrosting cycle greatly, has improved the work efficiency of air source heat pump. The utility model has the advantages of simple and reasonable structure, it is with low costs, realize easily, do not have the influence to the normal operating of system.
Drawings
The features and advantages of the invention will be more clearly understood by reference to the accompanying drawings, which are schematic and should not be understood as imposing any limitation on the invention, in which:
fig. 1 is a schematic structural diagram of a first embodiment of an air source heat pump evaporator according to the present invention;
FIG. 2 is a cross-sectional view taken along line d-d of FIG. 1;
fig. 3 is a schematic structural diagram of a third embodiment of the air source heat pump evaporator of the present invention;
fig. 4 is another schematic structural diagram of a third embodiment of the air source heat pump evaporator of the present invention.
Reference numerals
1 air source heat pump evaporator
11 refrigerant pipeline
12 fin
13b wing head
131b through hole
13c wing head
131c bending part
131d bent part
Detailed Description
The biggest problem of the air source heat pump unit in winter heating operation is frosting on the surface of the evaporator fin of the air source heat pump. Because the formation and the growth of frost layer, the heat transfer thermal resistance between air source heat pump evaporator fin surface and air has been increaseed, the flow resistance when the air current passes through air source heat pump evaporator fin has been increased, make the air mass flow through air source heat pump evaporator fin descend, heat exchange efficiency obviously reduces, lead to by the decline of heat transfer volume between air and the air source heat pump evaporator, heat pump set's operating condition worsens, can not normally work even, just need the defrosting this moment, whole air source heat pump set can not normally work in the defrosting process, on lengthy defrosting research and development road, research and development personnel have carried out a large amount of experiments and attempts, for example: the bypass hot gas delays frosting, the air pressure of a gas flow port is larger than or equal to a set air pressure value P0 by controlling the flow rate of high-temperature and high-pressure gas flowing from an exhaust port of a compressor to the gas flow port of the outdoor heat exchanger, so that the pressure of the gas flow port of the outdoor heat exchanger can be always kept in a higher range, the internal pressure of the outdoor air source heat pump evaporator is larger, and the surface temperature of the whole air source heat pump evaporator is higher. In addition, some researchers modify and inhibit frost on the surface of the air source heat pump evaporator, but the frost core is reduced by coating a hydrophobic coating or other smooth coatings, so that the cost is high and the process is complex.
Aiming at delaying frosting and prolonging the defrosting period, a great deal of experiments and researches are carried out by research personnel, and after deep analysis, the formation process of the frost is essentially different from the formation process of ice, the formation of the frost is the process of directly sublimating water vapor to form crystals, the formation process conforms to the general rule of crystallization, and if the formation process is divided into the following three stages from the external characteristics and the mechanism of crystal growth:
1. initial phase-formation of frost nuclei on the fin surface, on which water vapour in the air desublimates until the fin surface is covered by an initial frost layer.
2. And (3) a new frost layer is formed by continuously desublimating with the dendritic structure of the ice crystals on the surface of the frost layer as a desublimation core.
3. End period-frost layer thickens until the surface temperature of frost layer is higher than freezing point, at which time frost formation ends.
The ice forming process is divided into the following three stages;
1. the water vapor is liquefied into water.
2. The water turns into ice.
3. The water liquefies on the ice layer and then becomes ice again until the temperature of the ice surface increases above the freezing point, and the freezing is terminated.
According to the difference of the frosting and icing processes, once the surface of the air source heat pump evaporator of the air source heat pump is frosted, a plurality of crystal petals of frost can become the core of the next layer of frost, the frosting speed can be greatly increased, the density of the frost is 100-300g/cm3, the density of the ice is 900g/cm3, and the volume of the water vapor with the same volume is about three times that of the frost and the ice in two states.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
Example one
As shown in fig. 1-2, the present embodiment provides an air source heat pump evaporator 1, which includes a refrigerant pipeline 11 and a plurality of fins 12 serially installed on the refrigerant pipeline 11, a guiding structure capable of guiding water vapor in air to be liquefied into water rather than being desublimated into frost is installed on a windward side of the air source heat pump evaporator 1, the guiding structure is a coolerless slow cooling fin head 13b installed on a windward side of each fin 12, and the coolerless slow cooling fin head 13b is not installed with the refrigerant pipeline 11.
The utility model discloses air source heat pump evaporator, it is provided with the guide structure of vapor liquefaction but not desublimation in the guide air in the windward side, the guide structure need be passed before the air admission fin, when the air admission guide structure, make vapor liquefaction water, and become ice by water condensation during follow-up process fin, can avoid the direct desublimation of vapor to become the frost of many frost nucleuses on the one hand (the frost is the ice crystal of approximate snowflake form, the roughness is higher, the frost nucleuses is more), the speed of frosting that leads to accelerates, the volume that on the other hand vapor becomes ice again at the liquefaction water is dwindled greatly for the volume after directly desublimation frost by vapor, thereby it is long when having increased the jam of fin, the cycle of defrosting has been increased greatly. The utility model discloses the defrosting cycle of air source heat pump evaporimeter under same operating mode and defrosting condition is about original triple, has prolonged the defrosting cycle greatly, has improved the work efficiency of air source heat pump. The utility model has the advantages of simple and reasonable structure, it is with low costs, realize easily, do not have the influence to the normal operating of system.
It should be noted that the present invention is directed to the liquefaction of water vapor in air rather than desublimation, and the temperature of the windward side of the coolerless slow cooling fin is lower than the temperature of the liquefaction of water vapor and higher than the temperature of the solidification of water. In principle, the slow cooling can be realized only by keeping the non-refrigerant slow cooling fin head far enough from the refrigerant pipeline.
In order to increase the temperature of the coolant-free slow cooling fin head, in this embodiment, a plurality of through holes 131b penetrating in the thickness direction of the fin 12 are formed in the coolant-free slow cooling fin head.
The utility model provides a no refrigerant slow cooling fin head 13b can set up with the components of a whole that can function independently of fin 12, nevertheless consider in the installation of being convenient for this embodiment no refrigerant slow cooling fin head 13b with fin 12 structure as an organic whole.
The utility model provides a material of no refrigerant slow cooling fin head is unrestricted in principle, and it is as long as it stretches out in the air sufficient length in the refrigerant side enough in principle both can make the windward side temperature and the ambient temperature of no refrigerant slow cooling fin head be close mutually, nevertheless consider that no refrigerant slow cooling fin head is difficult for in the too wide (the resistance is great) this embodiment on the air advancing direction no refrigerant slow cooling fin head is made by the blue hydrophilic aluminium foil that coefficient of heat conductivity is less than 237w/m k.
Example two
This embodiment provides an air source heat pump evaporator, it is the same basically with embodiment, the difference lies in, does not have the refrigerant slow cooling fin head not make by low coefficient of heat conductivity's material, but has coated on the surface of no refrigerant slow cooling fin head and to have and to reduce no refrigerant slow cooling fin head coefficient of heat conductivity's coating, the utility model provides a coating can be blue hydrophilic coating, nano-coating, graphite alkene coating etc. the chooseing for use in this embodiment is blue hydrophilic coating.
EXAMPLE III
As shown in fig. 3-4, the present embodiment provides an air source heat pump evaporator, which is substantially the same as the fourth embodiment, except that the coolerless slow cooling fin 13c is provided with a slow cooling structure for increasing the slow cooling distance. The structure can increase the slow cooling length of the air and improve the liquefaction rate of the water vapor in the air.
The slow cooling structure can be any existing structure that can achieve the distance for air to flow between the slow cooling fins 13c, such as a bent portion 131d in fig. 4 or a bent portion 131c in fig. 3. The bent portion 131d or the bent portion 131c can increase the slow cooling length, increase the contact between the water vapor and the slow cooling fin head 13c, and facilitate the manufacturing.
Example four
The present embodiment provides an air source heat pump capable of extending a defrosting cycle, which includes an air source heat pump evaporator, a compressor, a condenser and a throttling device, wherein the air source heat pump evaporator is the air source heat pump evaporator described in embodiments one to three.
To sum up, the utility model discloses air source heat pump evaporator and air source heat pump can avoid the direct frost that becomes many frost nucleuses of vapor on the one hand, and the frosting speed that leads to accelerates, and on the other hand the volume of vapor after becoming ice is reduced greatly for the volume after directly becoming frost by the direct desublimation of vapor to it is long when having increased the jam of fin, has increased the cycle of defrosting greatly. The utility model discloses the defrosting cycle of air source heat pump evaporimeter under same operating mode and defrosting condition is about original triple, has prolonged the defrosting cycle greatly, has improved the work efficiency of air source heat pump.
The above-described embodiments are merely illustrative of the principles of the present invention and its efficacy, rather than limiting the same, and various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention, such modifications and variations all falling within the scope of the appended claims.
Claims (7)
1. The utility model provides an air source heat pump evaporimeter that can delay frosting, includes refrigerant pipeline and cluster dress a plurality of fins on the refrigerant pipeline, its characterized in that be provided with the no refrigerant slow cooling fin head that can guide the vapor liquefaction in the air but not desublimation in the windward side of fin, do not install on the no refrigerant slow cooling fin head the refrigerant pipeline.
2. The air-source heat pump evaporator as recited in claim 1, wherein said coolerless slow cooling fin has a plurality of through holes formed therethrough in a thickness direction of said fin.
3. The air-source heat pump evaporator of claim 1, wherein the coolerless slow cooling fin is of unitary construction with the fin.
4. The air-source heat pump evaporator of claim 1, wherein the coolerless slow cooling fins are made of a material having a thermal conductivity of less than 237 w/m-k.
5. The air-source heat pump evaporator of claim 1, wherein the coolant-free slow cooling fin surfaces are coated with a coating that reduces the coolant-free slow cooling fin thermal conductivity.
6. The air-source heat pump evaporator of claim 1, wherein the coolerless slow cooling fins are provided with slow cooling structures for increasing slow cooling distance.
7. An air source heat pump capable of extending the defrost cycle comprising a compressor, a condenser and a throttle means, further comprising an air source heat pump evaporator according to any of claims 1-6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921167515.5U CN210512252U (en) | 2019-07-23 | 2019-07-23 | Air source heat pump evaporator capable of delaying frosting and air source heat pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921167515.5U CN210512252U (en) | 2019-07-23 | 2019-07-23 | Air source heat pump evaporator capable of delaying frosting and air source heat pump |
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| CN210512252U true CN210512252U (en) | 2020-05-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110388767A (en) * | 2019-07-23 | 2019-10-29 | 山东奇威特太阳能科技有限公司 | Air source heat pump evaporator and design method and air source heat pump containing the evaporator |
| CN112361696A (en) * | 2020-11-10 | 2021-02-12 | 长虹美菱股份有限公司 | Evaporator with hydrophobic coating for refrigerator and preparation method thereof |
-
2019
- 2019-07-23 CN CN201921167515.5U patent/CN210512252U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110388767A (en) * | 2019-07-23 | 2019-10-29 | 山东奇威特太阳能科技有限公司 | Air source heat pump evaporator and design method and air source heat pump containing the evaporator |
| CN112361696A (en) * | 2020-11-10 | 2021-02-12 | 长虹美菱股份有限公司 | Evaporator with hydrophobic coating for refrigerator and preparation method thereof |
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