CN110388767A - Air source heat pump evaporator and design method and air source heat pump containing the evaporator - Google Patents
Air source heat pump evaporator and design method and air source heat pump containing the evaporator Download PDFInfo
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- CN110388767A CN110388767A CN201910665879.4A CN201910665879A CN110388767A CN 110388767 A CN110388767 A CN 110388767A CN 201910665879 A CN201910665879 A CN 201910665879A CN 110388767 A CN110388767 A CN 110388767A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
-
- 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
Abstract
The present invention provides a kind of air source heat pump evaporator and design method and the air source heat pump containing the evaporator, for solution, air source heat pump evaporator fin surface frosting velocity is very fast in the prior art, the shorter problem of frost layer blocking channel fast speed, defrosting cycle.The air source heat pump evaporator includes refrigerant pipe and multiple fins in tandem on the refrigerant pipe, the design method has the guide structure that water vapor in air can be guided to liquefy rather than sublimated to design in the windward side of the fin, so that the vapor in air freezes and frost-free, extend the knot defrost period to realize, defrost energy consumption is reduced, the purpose of unit overall performance is improved.Defrosting cycle of the air source heat pump evaporator of the present invention under same operating condition and defrosting condition is original three times or so, substantially prolongs defrosting cycle, improves the working efficiency of air source heat pump.The configuration of the present invention is simple, rationally, it is at low cost, it is easy to accomplish, the normal operation of system is not influenced.
Description
Technical field
The present invention relates to defrosting and delaying frosting field, more particularly to a kind of air source heat pump evaporator and design method
With the air source heat pump containing the evaporator.
Background technique
In recent years, the attention with Environmental protection, energy-saving and emission-reduction with the improvement of people ' s living standards, air-source heat
Pump assembly is widely used as a kind of energy-saving equipment.Net for air-source heat pump units is mainly by evaporator, compressor, condenser and section
Four part of device composition is flowed, (is released by allowing refrigerant constantly to complete evaporation (absorbing heat in external environment)-compression condensation
Heat)-throttling-evaporation thermodynamic cycle process, thus by from the heat absorbed in external environment be transferred in water or air into
Row heating.Net for air-source heat pump units in winter heating operation when the greatest problem that encounters be the frosting of evaporator fin surface.Due to
The formation and growth of frost layer, increase the heat transfer resistance between evaporator fin surface and air, increase air-flow and pass through evaporator
Flow resistance when fin so that declined by the air mass flow of evaporator fin, heat exchange efficiency is substantially reduced, causes by air
Heat exchange amount declines between evaporator, and the working condition of heat pump unit deteriorates, or even can not work normally, and just needs to remove at this time
Frost, the fan-out capability of entire air source heat pump needs to consume by sharp fall, and during defrosting during defrosting
The additional energy, this also considerably increases operating cost, and therefore, extending defrosting cycle is that raising air source heat pump winter is comprehensive
It can be with the important means of stability.
Mainly be able to extend defrosting cycle at present delays frosting mode as follows:
Bypass hot gas delays frosting: being arranged by exhaust outlet of compressor and is bypassed, be provided with solenoid valve on bypass line, controlled
The high temperature and pressure that the aperture of device electromagnetic valve for adjusting, i.e. control flow to the gas communication port of outdoor heat exchanger from exhaust outlet of compressor
The flow of gas makes the air pressure of gas communication port be greater than or equal to setting atmospheric pressure value P0, therefore can enable outdoor heat exchanger
The pressure of gas communication port remains at a higher range, enables outdoor evaporator internal pressure larger, entire evaporator
Surface temperature is higher, effectively delays outdoor unit frosting, but on the one hand the method can sacrifice unit portion of energy for delaying to tie
Frost, on the other hand can have that humidity is lower, and the waste of energy, comprehensive performance decline are caused in light frosting region.
The modified suppression frost of evaporator surface: frosting degree is reduced using ultrasonic wave or super-hydrophobic surface coating, but the method is taken
With higher, complex process is unfavorable for industrialized production.
Summary of the invention
In view of the drawbacks described above and deficiency of the prior art, the present invention provides a kind of air source heat pump evaporator and design method
With the air source heat pump containing the evaporator, for solve in the prior art air source heat pump evaporator fin surface frosting velocity compared with
Fastly, the shorter problem of frost layer blocking channel fast speed, defrosting cycle.
The present invention provides a kind of design method of air source heat pump evaporator, and the air source heat pump evaporator includes refrigerant
Pipeline and multiple fins in tandem on the refrigerant pipe, water in air can be guided by having in the windward side design of the fin
Steam liquefies rather than the guide structure sublimated.
The present invention provides a kind of air source heat pump evaporator, including refrigerant pipe and in tandem more on the refrigerant pipe
A fin, being provided in the windward side of the air source heat pump evaporator can guide water vapor in air to liquefy rather than sublimate
Guide structure.
Preferably, the guide structure is the grid that the fin windward side is arranged in, the temperature of the grid windward side
Less than the liquefied temperature of vapor, and it is greater than the solid temperature of water-setting, the vapor enters in the fin through grid channel.
Further, the blade in the grid is arranged in parallel, and the blade includes blade and the leaf for being able to suppress frosting
Head, the two sides of the leaf head and the blade draw wind-guiding face smooth connection.
Further, hollow structure is provided in the leaf head.
Further, temperature insulating material is filled in the hollow structure.
Further, the thermal coefficient of the leaf head is greater than 0.25w/mk and is less than 237w/mk.
Further, the leaf head include the first inclined-plane, the second inclined-plane and cylindrical surface, the two sides on the cylindrical surface respectively with
The side on the first inclined-plane and second inclined-plane is tangent, and the other side on first inclined-plane and second inclined-plane is flowed along air
Direction is opened, and the two sides with the blade are connected smoothly respectively.
Further, first inclined-plane and second inclined-plane are symmetricly set on the cylindrical surface two sides, and described
The angle on one inclined-plane and second inclined-plane is 5-10 °.
Further, the two sides of the blade are tapered inwardly along the air-flow direction.
Further, the taper angle of the side is 0.5-2 °.
Further, the impeller clearance trend of the grid and the gap of the air source heat pump evaporator fin are moved towards
Perpendicular, the leaf head of the blade is arranged to the inclined downward of windward side, the blade of the blade and the air source heat pump evaporation
The fin of hair device is in contact.
Preferably, the impeller clearance of the grid is moved towards to move towards equal with the gap of the air source heat pump evaporator fin
Row.
Further, the blade quantity of the grid is corresponding with the number of fins, and the blade tail of the blade
The windward side smooth engagement in portion and the fin.
Preferably, the guide structure be arranged in each fin windward side without refrigerant slow cooling wing head, the no refrigerant
On slow cooling wing head the refrigerant pipe is not installed.
Further, it is provided with and multiple to be penetrated through along slow cooling fin thickness direction on the no refrigerant slow cooling wing head
Through-hole.
Further, the no refrigerant slow cooling wing head is structure as a whole with the fin.
Further, material of the no refrigerant slow cooling wing head by thermal coefficient less than 237w/mk is made.
Further, the no refrigerant slow cooling wing head surface, which is painted with, can reduce the thermally conductive system of the no refrigerant slow cooling wing head
Several coatings.
Further, the slow cooling structure for increasing slow cooling distance is set on the no refrigerant slow cooling wing head.
The present invention also provides a kind of air source heat pumps for being able to extend defrosting cycle, including compressor, condenser and throttling
Device also includes air source heat pump evaporator described in any of the above embodiments.
Air source heat pump evaporator of the present invention and design method and air source heat pump containing the evaporator, fin windward
Side is provided with the guide structure that guidance water vapor in air liquefies rather than sublimates, and air needs to tie across guidance before entering fin
Structure makes vapor be liquefied as water, and build-up ice in subsequent process fin by water-setting, a side when air enters guide structure
Face can be avoided vapor and directly sublimate that (frost is the dendritic ice crystal of approximate snowflake shape, and roughness is higher, frost for the frost of Cheng Duoshuan core
Core is more), caused frosting velocity is accelerated, volume of the another aspect vapor after being liquefied as water and becoming ice again relative to by
The vapor volume after frosting of directly sublimating is substantially reduced, to increase the blocking duration of fin, increases defrosting significantly
Period.Defrosting cycle of the air source heat pump evaporator of the present invention under same operating condition and defrosting condition is original three times or so,
Defrosting cycle is substantially prolonged, the working efficiency of air source heat pump is improved.The configuration of the present invention is simple, rationally, it is at low cost, be easy
It realizes, the normal operation of system is not influenced.
Detailed description of the invention
The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, and attached drawing is schematically without that should manage
Solution is carries out any restrictions to the present invention, in the accompanying drawings:
Fig. 1 is the structural schematic diagram of air source heat pump evaporator embodiment one of the present invention；
Fig. 2 is the a-a cross-sectional view in Fig. 1；
Fig. 3 is the partial enlarged view in the region I in Fig. 2；
Fig. 4 is the structural schematic diagram of blade in embodiment one；
Fig. 5 is the structural schematic diagram of blade in air source heat pump evaporator embodiment two of the present invention；
Fig. 6 is the topology view of air source heat pump evaporator embodiment three of the present invention；
Fig. 7 is the b-b cross-sectional view in Fig. 6；
Fig. 8 is the c-c cross-sectional view in Fig. 7；
Fig. 9 is the structural schematic diagram of air source heat pump evaporator example IV of the present invention；
Figure 10 is the d-d cross-sectional view in Fig. 9；
The structural schematic diagram of Figure 11 air source heat pump evaporator embodiment five of the present invention；
The another structural schematic diagram of Figure 12 air source heat pump evaporator embodiment five of the present invention.
Appended drawing reference
1 air source heat pump evaporator
11 refrigerant pipes
12 fins
13 grids
131 blades
1311 leaf heads
1312 blades
1313 temperature insulating materials
13111 first inclined-planes
13112 cylindrical surfaces
13113 cavitys
13114 second inclined-planes
13121 first sides
13122 second sides
13a blade
13b wing head
131b through-hole
13c wing head
The bending section 131c
131d bending part
Specific embodiment
Net for air-source heat pump units in winter heating operation when the greatest problem that encounters be air source heat pump evaporator fin table
Face frosting.Due to the formation and growth of frost layer, the heat transfer resistance between air source heat pump evaporator fin surface and air is increased,
Increase flow resistance of the air-flow by air source heat pump evaporator fin when so that pass through air source heat pump evaporator fin
Air mass flow decline, heat exchange efficiency are substantially reduced, and cause heat exchange amount between air and air source heat pump evaporator to decline, heat pump machine
The working condition of group deteriorates, or even can not work normally, and just needs to defrost at this time.On very long defrosting research and development road, grind
Hair personnel have carried out a large amount of experiment and trial, such as: bypass hot gas delays frosting, by controlling from exhaust outlet of compressor stream
To the flow of the high temperature and high pressure gas of the gas communication port of outdoor heat exchanger, it is greater than or equal to the air pressure of gas communication port and sets
Determine atmospheric pressure value P0, therefore the pressure of the gas communication port of outdoor heat exchanger can be enabled to remain at a higher range,
Enable outdoor air source heat pump evaporation hair device internal pressure larger, entire air source heat pump evaporator surface temperature is higher, but this side
Method only increases entire air source heat pump evaporator surface temperature, to slow down the speed of frosting, delays frosting with this, this
Although method also has the effect for delaying frosting to increase defrosting cycle, energy dissipation and the decline of comprehensive performance will cause.In addition
Also there is research staff by the modified suppression frost in air source heat pump evaporator surface, but its multi-pass crosses coating hydrophobic coating or other are smooth
Coating coagulates white core, costly, complex process to reduce.
For how to delay frosting to extend defrosting cycle, our research staff has carried out a large amount of experiment and research, warp
The forming process of forming process and ice that frost is found after depth analysis is essentially different, and white formation is direct by water vapour
It sublimates to form brilliant process, it meets the universal law of crystallization, if can be divided into from its surface and the mechanism of crystalline growth
Following three phases:
1, initial period-forms white core in fin surface, and water vapor in air is sublimated on white core until fin surface is first
The covering of beginning frost layer.
2, the rise period-is that core of sublimating continues to sublimate to form new frost layer with the dendritic structure of frost layer surface ice crystal.
3, amortization period-frost layer thickens until frost layer surface temperature is higher than freezing point, and frosting at this time terminates.
And the forming process of ice is divided into following three phases；
1, vapor is liquefied as water.
2, water becomes ice.
3, water liquefies on ice sheet then becomes ice again, until ice face temperature increases to above freezing, then freeze termination.
In the frosting rise period it can be seen from the difference of above-mentioned frosting and freezing process, because the ice crystal of frost is similar snowflake
The dendritic structure of shape, once the frosting of air source heat pump evaporator surface, white multiple brilliant valves can become next layer of white frost
Core, this can greatly increase the speed of frosting, and the density of frost is 100-300g/cm3, and the density of ice is 900g/cm3, identical
The vapor of volume is in frost and ice two states lower volume difference three times or so, so based on the above analysis, the present invention provides one
Kind air source heat pump evaporator and design method and the air source heat pump containing the evaporator, for solving air-source in the prior art
Evaporator with heat pump fin surface frosting velocity is very fast, the shorter problem of frost layer blocking channel fast speed, defrosting cycle.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
Embodiment one
The present invention provides a kind of design method of air source heat pump evaporator, and the air source heat pump evaporator includes refrigerant
Pipeline and multiple fins in tandem on the refrigerant pipe, water in air can be guided by having in the windward side design of the fin
Steam liquefies rather than the guide structure sublimated, based on the design method in the present invention, the present embodiment provides it is a kind of as shown in Figs 1-4
Air source heat pump evaporator 1, air source heat pump evaporator 1 includes refrigerant pipe 11 and in tandem on the refrigerant pipe 11
Multiple fins 12 are provided in the windward side of the air source heat pump evaporator 1 and water vapor in air can be guided to be liquefied as water
Rather than the guide structure (grid 13) frosted of sublimating.
A kind of air source heat pump evaporator of the present invention and design method and the air source heat pump containing the evaporator, in windward side
The guide structure for being provided with guidance water vapor in air partial liquefaction rather than sublimating, air need before entering fin 12 across guidance
Structure makes vapor be liquefied as water, and build-up ice in subsequent process fin 12 by water-setting when air enters guide structure,
On the one hand can be avoided vapor directly sublimate the frosting velocity caused by frosting accelerate (frost for approximate snowflake shape dendroid ice
Crystalline substance, roughness is higher, and white core is more), volume of the another aspect vapor after being liquefied as water and becoming ice again is steamed relative to by water
The gas volume after frosting of directly sublimating is substantially reduced, to increase the blocking duration of fin 12, increases the week of defrosting significantly
Phase.Defrosting cycle of the air source heat pump evaporator 1 of the present invention under same operating condition and defrosting condition is original three times or so, is prolonged
Defrosting cycle has been grown, the working efficiency of air source heat pump is improved.The configuration of the present invention is simple, rationally, it is at low cost, it is easy to accomplish,
The normal operation of system is not influenced.
Guide structure in the present invention can be 12 windward side of fin to be arranged in water vapor in air is liquefied as the one of water
Structure is cut, the guide structure in the present embodiment is the grid 13 that 12 windward side of fin is arranged in, to guarantee grid 13 windward
The temperature of side is less than the liquefied temperature of vapor, and is greater than the solid temperature of water-setting, and the vapor enters institute through 13 channel of grid
It states in fin 12.The guarantee of grid temperatures can also be realized by multiple means in the prior art in the present invention, but be considered
It is closer to grid and fin, there are heat radiation and heat transfer, so be not necessary to use other temperature control modes again in the present embodiment,
It is only come close to or in contact with the side of guarantee grid 13 with fin 12, long enough is stretched out in the air of 12 side of fin in the other side
Degree, grid 13 can be the structure being independently arranged, and can also be wholely set with fin 12, grid 13 can make air uniform
Stable enters fin 12, is arranged to structure as grid 13 and is not only convenient for making and install, and can make vapor liquid
That changes is more abundant.
131 set-up mode of blade in heretofore described grid 13 is unrestricted in principle, as long as can make in air
Vapor have enough liquefaction contacts area, but local turbulent makes air steadily enter subsequent fin 12 in order to prevent,
Multiple blades 131 in grid 13 in the present embodiment are arranged in parallel, and blade 131 includes blade 1312 and is able to suppress frosting
Leaf head 1311, the two sides of the leaf head 1311 and the blade 1312 draw wind-guiding face smooth connection.
The blade of grid 13 can be existing common solid sheet metal blade in the present invention, need to only meet temperature less than water
The liquefied temperature of steam, and it is greater than the solid temperature of water-setting, structure can be seldom limited in principle, but consider grid 13
It is mounted near fin 12, temperature is lower, and in the case where not increasing heat-increasing device, blade needs wider width, the present embodiment
Described in be provided with hollow structure in leaf head 1311.Hollow structure can further weaken the low temperature that fin 12 transmits, can be with
It effectively shortens width of the blade on air-flow direction of travel, blade 131 can be made to reach in shorter width and meet vapor liquid
The temperature of change.
Hollow structure in middle period head 1311 of the invention can be not filled with any material, but in view of further reducing blade
131 heat effect in the width of air direction of travel and raising, preferably, hollow structure described in the present embodiment in filled with every
Adiabator 1313, temperature insulating material 1313 are thermal insulation material of the thermal coefficient less than 0.12, such as aeroge, expanded perlite, glass
Cotton, foamed cement etc., in addition to obtaining better effect, the thermal coefficient of leaf head described in the present embodiment 1311 is greater than
0.25w/mk and be less than 237w/mk, leaf head 1311 can be ABS, PA, PP+25% glass, PU, the materials such as glass reinforced plastic.
Move towards, this implementation unrestricted in principle with the positional relationship of fin clearance in 131 gap of blade of the grid 13
12 gap of fin of gap trend and the air source heat pump evaporator 1 in example between blade 131 moves towards perpendicular, the blade
131 leaf head 1311 is arranged to the inclined downward of windward side, and the blade 1312 and the air source heat pump of the blade 131 evaporate
The fin 12 of device 1 is in contact.
Embodiment two
As shown in figure 5, be the present embodiment provides a kind of air source heat pump evaporator with the difference of embodiment one, this
Leaf head 1311 in embodiment in grille blades 131 includes the first inclined-plane 13111, the second inclined-plane 13114 and cylindrical surface 13112,
The two sides on the cylindrical surface 13112 are tangent with the side on the first inclined-plane 13111 and second inclined-plane 13114 respectively, and described
The other side on one inclined-plane 13111 and second inclined-plane 13114 along air-flow direction open, and respectively with the blade 1312
Two sides be connected smoothly, hollow structure 13113 is provided in leaf head 1311, this structure can make leaf head 1311 more
Add it is round and smooth be not easy to depend on, and in order to reach the first inclined-plane 13111 and described second described in better effect the present embodiment
Inclined-plane 13114 is symmetricly set on 13112 two sides of cylindrical surface, first inclined-plane 13111 and second inclined-plane 13114
Included angle is 5-10 °, not only can guarantee increase gas-flow resistance that will not be excessive in this angular range, but also vapor can be made to be expert at
It preferably contacts and can sufficiently liquefy with the first inclined-plane 13111 or the second inclined-plane 13114 during, and in adjacent two leaf
One narrow wind band is formed between first 1311, can increase wind pressure makes vapor be easier to liquefy here.
First side 13121 and second side in order to reduce resistance, in 1312 two sides of rear side blade for completion of having liquefied
Face 13122 is tapered inwardly along the air-flow direction, reduces air velocity, with prevent liquefaction droplet air velocity compared with
Fin 12 is sucked when big.The taper angle β of first side 13121 and second side 13122 is 0.5-2 ° in the present embodiment.
Embodiment three
As shown in figs 6-8, the present embodiment provides a kind of air source heat pump evaporator 1, it is with the difference of embodiment one,
The grid 13a the gap blade 131a trend with 12 gap of fin of the air source heat pump evaporator 1 move towards it is parallel and
The blade 131a quantity of the grid 13a is corresponding with 12 quantity of fin, the tail portion the blade 131a and the fin 12
Windward side smooth engagement.
Example IV
If Fig. 9-10 is the present embodiment provides a kind of air source heat pump evaporator 1, including refrigerant pipe 11 and in tandem described
Multiple fins 12 on refrigerant pipe 11 are provided with and can guide in air in the windward side of the air source heat pump evaporator 1
Water vapor portion is liquefied as the guide structure of water.The guide structure be arranged in each 12 windward side of fin without refrigerant slow cooling
On wing head 13b, the no refrigerant slow cooling wing head 13b refrigerant pipe 11 is not installed.
It is multiple without being provided on refrigerant slow cooling wing head described in the present embodiment in order to increase the temperature of no refrigerant slow cooling wing head
The through-hole 131b penetrated through along 12 thickness direction of slow cooling fin.
In the present invention without refrigerant slow cooling wing head 13b can with 12 split settings of fin, but in view of being easily installed this reality
It applies and is structure as a whole described in example without refrigerant slow cooling wing head 13b and the fin 12.
The material without refrigerant slow cooling wing head in the present invention is unrestricted in principle, as long as empty stretching out away from medium side
Sufficient length can both make the windward side temperature of no refrigerant slow cooling wing head be close with environment temperature in principle in gas, but consider
No refrigerant slow cooling wing head is not easy described in wide (resistance is larger) the present embodiment without refrigerant slow cooling wing head on air direction of travel
Blue hydrophilic aluminium foil by thermal coefficient less than 237w/mk is made.
Embodiment five
It is essentially identical with example IV the present embodiment provides a kind of air source heat pump evaporator, the difference is that, nothing
Refrigerant slow cooling wing head is not made of the material of low thermal conductivity, but is painted with and can reduce in no refrigerant slow cooling wing head surface
The coating of the no refrigerant slow cooling wing head thermal coefficient, the coating in the present invention can be blue hydrophilic coating, and nanometer applies
Layer, graphite ene coatings etc., selecting in the present embodiment is blue hydrophilic coating.
Embodiment six
As depicted in figs. 11-12, it the present embodiment provides a kind of air source heat pump evaporator, is substantially the same with example IV,
The difference is that setting increases the slow cooling structure of slow cooling distance on the no refrigerant slow cooling wing head 13c.This structure can increase
The slow cooling length for adding air, can improve the liquefied fraction of water vapor in air.
Slow cooling structure can circulate all existing knots of distance for the existing air that can increase between slow cooling wing head 13c
Structure, such as the bending part 131d in Figure 12 or such as the bending section 131c in Figure 11.This bending part 131d or bending section 131c are not only
Slow cooling length can be increased, increase the contact of vapor and slow cooling wing head 13c, and convenient for production.
Embodiment seven
The present embodiment provides a kind of air source heat pump for being able to extend defrosting cycle, including evaporator, compressor, condensers
And throttling set, evaporator are air source heat pump evaporator described in embodiment one to six.
To sum up, air source heat pump evaporator of the present invention and design method and the air source heat pump containing the evaporator, by
Fin windward side is provided with the guide structure that guidance water vapor in air liquefies rather than sublimates, and the vapor in air is made first to liquefy
Cheng Shui, and it is subsequent by fin when build-up ice by water-setting, on the one hand can be avoided vapor and directly sublimate the frost of Cheng Duoshuan core
(frost is the dendritic ice crystal of approximate snowflake shape, and roughness is higher, and white core is more), caused frosting velocity is accelerated, another party
Volume of the face vapor after being liquefied as water and becoming ice again is substantially reduced relative to the volume after frosting of directly being sublimated by vapor,
To increase the blocking duration of fin, the period of defrosting is increased significantly.Air source heat pump evaporator of the present invention is in same work
Defrosting cycle under condition and defrosting condition is original three times or so, substantially prolongs defrosting cycle, improves air source heat pump
Working efficiency.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention, this field
Technical staff can various modifications and variations can be made without departing from the spirit and scope of the present invention, it is such modification and
Modification is each fallen within be defined by the appended claims within the scope of.
Claims (21)
1. a kind of design method of air source heat pump evaporator, the air source heat pump evaporator include refrigerant pipe and it is in tandem
Multiple fins on the refrigerant pipe, which is characterized in that water in air can be guided by having in the windward side design of the fin
Steam liquefies rather than the guide structure sublimated.
2. a kind of air source heat pump evaporator, special including refrigerant pipe and multiple fins in tandem on the refrigerant pipe
Sign is, being provided in the windward side of the air source heat pump evaporator can guide the water vapor in air to liquefy rather than sublimate
Guide structure.
3. air source heat pump evaporator according to claim 2, which is characterized in that the guide structure is to be arranged described
The grid of fin windward side, the temperature of the grid windward side are less than the liquefied temperature of vapor, and are greater than the solid temperature of water-setting,
The vapor enters in the fin through grid channel.
4. air source heat pump evaporator according to claim 3, which is characterized in that the blade in the grid is set in parallel
It sets, the blade includes blade and the leaf head for being able to suppress frosting, and the two sides of the leaf head and the wind-guiding face of drawing of the blade are put down
Sliding docking.
5. air source heat pump evaporator according to claim 4, which is characterized in that be provided with hollow knot in the leaf head
Structure.
6. air source heat pump evaporator according to claim 5, which is characterized in that be filled with thermal insulation in the hollow structure
Material.
7. air source heat pump evaporator according to claim 4, which is characterized in that the thermal coefficient of the leaf head is greater than
0.25w/mk and be less than 237w/mk.
8. air source heat pump evaporator according to claim 4, which is characterized in that the leaf head includes the first inclined-plane, the
Two inclined-planes and cylindrical surface, the two sides on the cylindrical surface are tangent with the side on the first inclined-plane and second inclined-plane respectively, and described
The other side on one inclined-plane and second inclined-plane is opened along air-flow direction, and smoothed with the two sides of the blade respectively
Cross connection.
9. air source heat pump evaporator according to claim 8, which is characterized in that first inclined-plane and described second is tiltedly
Face is symmetricly set on the cylindrical surface two sides, and the angle on first inclined-plane and second inclined-plane is 5-10 °.
10. air source heat pump evaporator according to claim 9, which is characterized in that the two sides of the blade are along described
Air-flow direction is tapered inwardly.
11. air source heat pump evaporator according to claim 10, which is characterized in that the taper angle of the side is
0.5-2°。
12. air source heat pump evaporator according to claim 4, which is characterized in that move towards the impeller clearance of the grid
Move towards perpendicular with the gap of the air source heat pump evaporator fin, the leaf head of the blade is set to the inclined downward of windward side
It sets, the blade of the blade is in contact with the fin of the air source heat pump evaporator.
13. air source heat pump evaporator according to claim 4, which is characterized in that move towards the impeller clearance of the grid
Move towards parallel with the gap of the air source heat pump evaporator fin.
14. air source heat pump evaporator according to claim 13, which is characterized in that the blade quantity of the grid and institute
State that number of fins is corresponding, and the windward side smooth engagement of the blade tail portion of the blade and the fin.
15. air source heat pump evaporator according to claim 2, which is characterized in that the guide structure is to be arranged every
A fin windward side without refrigerant slow cooling wing head, on the no refrigerant slow cooling wing head refrigerant pipe is not installed.
16. air source heat pump evaporator according to claim 15, which is characterized in that set on the no refrigerant slow cooling wing head
It is equipped with multiple through-holes penetrated through along slow cooling fin thickness direction.
17. air source heat pump evaporator according to claim 15, which is characterized in that the no refrigerant slow cooling wing head and institute
Fin is stated to be structure as a whole.
18. air source heat pump evaporator according to claim 15, which is characterized in that the no refrigerant slow cooling wing head is by leading
Material of the hot coefficient less than 237w/mk is made.
19. air source heat pump evaporator according to claim 16, which is characterized in that the no refrigerant slow cooling wing head surface
It is painted with the coating that can reduce the no refrigerant slow cooling wing head thermal coefficient.
20. air source heat pump evaporator according to claim 15, which is characterized in that set on the no refrigerant slow cooling wing head
Set the slow cooling structure for increasing slow cooling distance.
21. a kind of air source heat pump for being able to extend defrosting cycle, including compressor, condenser and throttling set, feature exist
In also comprising air source heat pump evaporator described in any one of claim 1-20.
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| CN201910665879.4A CN110388767A (en) | 2019-07-23 | 2019-07-23 | Air source heat pump evaporator and design method and air source heat pump containing the evaporator |
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| CN201910665879.4A CN110388767A (en) | 2019-07-23 | 2019-07-23 | Air source heat pump evaporator and design method and air source heat pump containing the evaporator |
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| CN110779197A (en) * | 2019-11-25 | 2020-02-11 | 彭从文 | Anti-drying air conditioner heat exchanger |
| CN113803917A (en) * | 2021-09-17 | 2021-12-17 | 北京金茂绿建科技有限公司 | Defrosting method and device for finned heat exchanger |
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