CN206637895U - Evaporator with defrosting function - Google Patents
Evaporator with defrosting function Download PDFInfo
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- CN206637895U CN206637895U CN201720128634.4U CN201720128634U CN206637895U CN 206637895 U CN206637895 U CN 206637895U CN 201720128634 U CN201720128634 U CN 201720128634U CN 206637895 U CN206637895 U CN 206637895U
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- evaporator
- tube
- defrosting
- fin
- heating pipeline
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Abstract
The utility model provides a kind of evaporator with defrosting function, including：Evaporator body, defrosting heater, it is arranged at the bottom of evaporator body, and there is the distance specified with evaporator, defrosting heater includes heating pipeline and multiple radiating fins, multiple radiating fins are sheathed on heating pipeline, and heating pipeline is used to carry out defrost to evaporator body with multiple radiating fins.Pass through the technical solution of the utility model, transferred heat to radiating fin together with heating pipeline on evaporator in a manner of heat radiation and thermal convection current, increase area of dissipation, add Radiant exothermicity during defrost, effectively shorten the defrost heat time, defrost efficiency is improved, and reduces energy consumption increment during defrost.
Description
Technical field
Art of refrigeration units is the utility model is related to, in particular to a kind of evaporator with defrosting function.
Background technology
In the related art, as shown in figure 1, being made in the evaporator in the refrigeration plants such as refrigerator is completed to refrigeration plant
After the evaporation work of cryogen, the evaporation tube temperature of evaporator is reduced, and when steam passes through evaporation tube, frost is condensed on evaporation tube,
The condensation of frost layer hinders the air circulation outside evaporator, by setting the defrosting heater of light-pipe structure, although having certain
Defrosting effect, but still suffer from following defect：
Because the area of dissipation of light pipe is small, cause heat radiation area small, the defrost time is grown, frost layer on further induced evaporation device
Accumulation, the air circulation outside evaporator is hindered, the evaporation effect of refrigerant in evaporator is reduced, so as to influence refrigeration plant
Refrigeration, or even cause refrigeration plant failure to occur.
Therefore, the operating efficiency of defrosting heater how is improved, has become urgent problem to be solved.
Utility model content
At least one in order to solve the above-mentioned technical problem, a purpose of the present utility model is that providing one kind has defrost
The evaporator of function.
A purpose of the present utility model is to provide a kind of evaporator with defrosting function.
A purpose of the present utility model is to provide a kind of refrigeration plant.
To achieve these goals, the embodiment of the utility model first aspect provides a kind of steaming with defrosting function
Device is sent out, including：Evaporator body；Defrosting heater, is arranged at the bottom of evaporator body, and have with evaporator specify away from
From defrosting heater includes heating pipeline and multiple radiating fins, and multiple radiating fins are sheathed on heating pipeline, and generate heat pipeline
It is used to carry out defrost to evaporator body with multiple radiating fins.
In the technical scheme, because evaporator body absorbs extraneous heat, cause the condensation vapor Cheng Shuan in air
On an evaporator, the accumulation of frost layer hinders the circulation of evaporator and outside air, passes through setting in the bottom of evaporator for covering
Defrosting heater is put, and by increasing radiating fin in heating pipeline, makes heating pipeline that partial heat is transferred into radiating fin
Piece, transferred heat on evaporator in a manner of heat radiation and thermal convection current, increased together with heating pipeline radiating fin
Area of dissipation, adds Radiant exothermicity during defrost, effectively shortens defrost heat time, improves defrost efficiency, and subtract
Energy consumption increment during defrost is lacked.
In addition, the evaporator with defrosting function in above-described embodiment provided by the utility model can also be with as follows
Additional technical feature：
In the above-mentioned technical solutions, it is preferable that heating pipeline is series pipe, and series pipe includes multiple transverse tubes with erecting
Pipe, adjacent two transverse tube for being arranged at inner side are connected by U-tube, and the adjacent transverse tube and vertical tube for being arranged at outside pass through folding
Bend pipe connects.
In the technical scheme, by the way that heating pipeline is arranged into series pipe, and series pipe includes multiple transverse tubes
With vertical tube, adjacent two transverse tube for being arranged at inner side is connected by U-tube, and the adjacent transverse tube for being arranged at outside leads to vertical tube
Cross bending tube connection, on the one hand, be advantageous to increase area of dissipation, on the other hand, be conveniently sheathed on multiple radiating fins, realize
The high efficiency transmission of heat.
In order to further increase Radiant exothermicity, multiple seriess pipe can also be arranged side by side.
Specifically, by the way that multiple seriess pipe are arranged side by side, on the one hand, reduce due between multiple seriess pipe by
In away from too far away, the uneven probability of heat conveying, on the other hand, reduce between adjacent tubes because heat gap is big, cause
Pipeline outside air produce vortex phenomenon so that influence heating pipeline radiating effect, further improve defrost efficiency.
In any of the above-described technical scheme, it is preferable that at least one vertical tube extends to the central region of evaporator.
In the technical scheme, by the way that at least one vertical tube to be extended to the central region of evaporator, in evaporator
When portion produces the phenomenon of frosting, the defrost efficiency to the middle part of evaporator is further improved.
In addition, setting multiple transverse tubes at the top of heating pipeline, these transverse tubes are nearest apart from evaporator, multiple by setting
Transverse tube is distributed, and the radiating efficiency of heating pipeline is increased, in addition, multiple transverse tube horizontal distributions, it is possible to reduce transverse tube upper air
Because temperature is different, caused vortex phenomenon, so as to improve the radiating efficiency of radiating tube.
In any of the above-described technical scheme, it is preferable that multiple radiating fins are equally spaced on transverse tube and vertical tube.
In the technical scheme, by being equally spaced in the radiating fin on heating pipeline, the heat of heating pipeline is improved
Swept area, meanwhile, radiating fin provides guiding function using the direction for being shaped as heat radiation of its own, and heat is efficient
On the guiding of rate to evaporator, reduce the waste of heat, in addition, being equally spaced between radiating fin, improves heat-generating pipe
Road upper air carries out stability during thermal convection current, improves the utilization rate of heat in heating pipeline.
In any of the above-described technical scheme, it is preferable that radiating fin includes rectangle fin, and rectangle fin is socketed in horizontal stroke
Guan Shang.
In the technical scheme, rectangle fin is arranged by being arranged on transverse tube, improves the heat transfer between transverse tube
Efficiency, meanwhile, there is fixed effect to transverse tube, realize the heat-transfer effect of small space large area, increase the heat of radiator
Radiating surface.
In any of the above-described technical scheme, it is preferable that radiating fin includes the wake-up fin that periphery is folded upward at, annular wing
Piece is socketed on vertical tube.
In the technical scheme, by the ring fin for setting periphery to be folded upward at, it is arranged on the vertical tube of radiating tube, erects
Heat is transferred to ring fin by pipe in thermo-conducting manner, and outwardly radiations heat energy, annular dissipate vertical tube simultaneously with ring fin
Hot fin periphery is bent to evaporator direction, and guiding function is provided for the direction of heat radiation, further increases dissipating for vertical tube
The thermal efficiency.
In any of the above-described technical scheme, it is preferable that also include：C-shaped drains water leg, and C-shaped drains the top of water leg
Level trough is arranged between evaporator body and defrosting heater, and C-shaped drainage water leg is arranged at the side of defrosting heater, C
The lower horizontal groove of shape drainage water leg is arranged at the bottom of defrosting heater, and C-shaped drainage water leg is used to collect shape after defrost
Into liquid.
In the technical scheme, by being arranged at the water leg of defrosting heater bottom, collect frost layer on evaporator and melt
Water, it is therefore prevented that because water flows into inside refrigeration plant or refrigeration plant failure caused by flowing on defrosting heater.
Furthermore it is also possible to set bend pipe in heating BOP, to melt the frost layer condensed in water leg, frost layer is melted
For water, then timely discharge, reduce water double evaporation-cooling to condense into the phenomenon of frost layer after steam, improve with defrosting function
Evaporator job stability.
In any of the above-described technical scheme, it is preferable that radiating fin is aluminum alloy fin and/or copper fin.
In any of the above-described technical scheme, it is preferable that heating pipeline is ellipticity radiating tube, and ellipticity radiating tube is connected to
Power supply, pass through power supply heating power.
In any of the above-described technical scheme, it is preferable that also include：Connecting plate, connecting plate are rectangle structure, are arranged at steaming
Send out between device body and defrosting heater.
In the technical scheme, by the connecting plate being arranged between evaporator body and defrosting heater, defrost is connected
The entrance and exit region of the evaporation tube of heater and evaporator, it effectively prevent entrance and the exit frosting of evaporation tube
So as to improve the refrigeration of evaporator.
The embodiment of second aspect of the present utility model provides a kind of refrigeration plant, including the utility model first aspect
Any one of technical scheme provide the evaporator with defrosting function.
The refrigeration plant that the embodiment of second aspect of the present utility model provides, because being provided with the utility model first aspect
The evaporator with defrosting function of embodiment, so that whole beneficial effects with the above-mentioned evaporator with defrosting function,
It will not be repeated here.
Additional aspect and advantage of the present utility model will become obvious in following description section, or new by this practicality
The practice of type is recognized.
Brief description of the drawings
Of the present utility model above-mentioned and/or additional aspect and advantage will in the description from combination accompanying drawings below to embodiment
Become obvious and be readily appreciated that, wherein：
Fig. 1 shows the structural representation of evaporator in correlation technique；
Fig. 2 shows the structural representation of the evaporator with defrosting function according to one embodiment of the present utility model
Figure；
Wherein, the corresponding relation in Fig. 2 between reference and component names is：
10 evaporator bodies, 20 defrosting heaters, 202 heating pipelines, 2022 transverse tubes, 2024 vertical tubes, 2026U shape pipes, 204
Radiating fin, 2042 rectangle fins, 2044 ring fins.
Embodiment
In order to be more clearly understood that above-mentioned purpose of the present utility model, feature and advantage, below in conjunction with the accompanying drawings and tool
The utility model is further described in detail body embodiment.It should be noted that in the case where not conflicting, this Shen
The feature in embodiment and embodiment please can be mutually combined.
Many details are elaborated in the following description in order to fully understand the utility model, still, this practicality
New to be different from other modes described here using other to implement, therefore, the scope of protection of the utility model is simultaneously
Do not limited by following public specific embodiment.
The evaporator with defrosting function referring to Fig. 2 descriptions according to some embodiments of the utility model.
As shown in Fig. 2 according to one embodiment of the present utility model, there is provided a kind of evaporator with defrosting function,
Including：Evaporator body 10, including evaporation pipeline and evaporation fin, evaporation fin are sheathed on evaporation pipeline；Defrosting heater
20, the bottom of evaporator body 10 is arranged at, and there is the distance specified with evaporator, defrosting heater 20 includes heating pipeline
202 are sheathed on heating pipeline 202 with multiple radiating fins 204, multiple radiating fins 204, heating pipeline 202 and multiple radiatings
Fin 204 is used to carry out defrost to evaporator body 10.
In this embodiment, because evaporator body 10 absorbs the heat in the external world, the condensation vapor Cheng Shuan in air is caused
On an evaporator, the accumulation of frost layer hinders the circulation of evaporator and outside air, passes through setting in the bottom of evaporator for covering
Defrosting heater 20 is put, and by increasing radiating fin 204 in heating pipeline 202, heating pipeline 202 is passed partial heat
Be handed to radiating fin 204, radiating fin 204 with heating pipeline 202 together with a manner of heat radiation and thermal convection current by heat
It is transferred on evaporator, increases area of dissipation, add Radiant exothermicity during defrost, effectively shortens the defrost heat time,
Defrost efficiency is improved, and reduces energy consumption increment during defrost.
In addition, the evaporator with defrosting function in above-described embodiment provided by the utility model can also be with as follows
Additional technical feature：
Embodiment one：
As shown in Fig. 2 according to one embodiment of the present utility model, heating pipeline 202 is series pipe, series pipe bag
Multiple transverse tubes 2022 and vertical tube 2024 are included, adjacent two transverse tube 2022 for being arranged at inner side is connected by U-tube 2026, is set
Adjacent transverse tube 2022 in outside is connected with vertical tube 2024 by bending tube.
In this embodiment,
By the way that heating pipeline 202 is arranged into series pipe, and series pipe includes multiple transverse tubes 2022 and vertical tube
2024, adjacent two transverse tube 2022 for being arranged at inner side is connected by U-tube 2026, is arranged at the adjacent transverse tube in outside
2022 are connected with vertical tube 2024 by bending tube, on the one hand, are advantageous to increase area of dissipation, on the other hand, are conveniently sheathed on more
Individual radiating fin 204, realize the high efficiency transmission of heat.
In order to further increase Radiant exothermicity, multiple seriess pipe can also be arranged side by side.
Specifically, by the way that multiple seriess pipe are arranged side by side, on the one hand, reduce due between multiple seriess pipe by
In away from too far away, the uneven probability of heat conveying, on the other hand, reduce between adjacent tubes because heat gap is big, cause
Pipeline outside air produce vortex phenomenon so that influence heating pipeline 202 radiating effect, further improve defrost effect
Rate.
Embodiment two：
As shown in Fig. 2 according to one embodiment of the present utility model, it is preferable that preferably, at least one vertical tube 2024 prolongs
Extend the central region of evaporator.
In the technical scheme, by the way that at least one vertical tube 2024 to be extended to the central region of evaporator, in evaporator
Middle part produce frosting phenomenon when, further improve the defrost efficiency to the middle part of evaporator.
In addition, setting multiple transverse tubes 2022 at the top of heating pipeline 202, these transverse tubes 2022 are nearest apart from evaporator,
By setting multiple transverse tubes 2022 to be distributed, the radiating efficiency of heating pipeline 202 is increased, in addition, horizontal point of multiple transverse tubes 2022
Cloth, it is possible to reduce the upper air of transverse tube 2022 is because temperature is different, caused vortex phenomenon, so as to improve the radiating of radiating tube
Efficiency.
According to one embodiment of the present utility model, it is preferable that multiple radiating fins 204 be equally spaced in transverse tube 2022 with
On vertical tube 2024.
By being equally spaced in the radiating fin 204 on heating pipeline 202, the heat radiation surface of heating pipeline 202 is improved
Product, meanwhile, radiating fin 204 provides guiding function using the direction for being shaped as heat radiation of its own, by heat high efficiency
Guiding to evaporator on, reduce the waste of heat, in addition, being equally spaced between radiating fin 204, improves heat-generating pipe
The upper air of road 202 carries out stability during thermal convection current, improves the utilization rate of heat in heating pipeline 202.
According to one embodiment of the present utility model, it is preferable that radiating fin 204 includes rectangle fin 2042, rectangular
Shape fin 2042 is socketed on transverse tube 2022.
In the technical scheme, rectangle fin 2042 is arranged by being arranged on transverse tube 2022, improves transverse tube 2022
Between heat conduction efficiency, meanwhile, there is fixed effect to transverse tube 2022, realize the heat-transfer effect of small space large area,
Increase the surface thermal radiation of radiator.
According to one embodiment of the present utility model, it is preferable that radiating fin 204 includes the wake-up wing that periphery is folded upward at
Piece, ring fin 2044 are socketed on vertical tube 2024.
In the technical scheme, by the ring fin 2044 for setting periphery to be folded upward at, the vertical tube of radiating tube is arranged at
On 2024, heat is transferred to ring fin 2044, vertical tube 2024 and ring fin 2044 by vertical tube 2024 in thermo-conducting manner
Outwardly radiations heat energy, the periphery of circular radiating fin 204 bend to evaporator direction, provided for the direction of heat radiation simultaneously
Guiding function, further increase the radiating efficiency of vertical tube 2024.
According to one embodiment of the present utility model, it is preferable that also include：C-shaped drains water leg, C-shaped drainage water leg
Upper horizontal groove be arranged between evaporator body 10 and defrosting heater 20, C-shaped drainage water leg be arranged at defrost heating
The side of device 20, the lower horizontal groove of C-shaped drainage water leg are arranged at the bottom of defrosting heater 20, and C-shaped drainage water leg is used
The liquid formed after defrost is collected.
In the technical scheme, by being arranged at the water leg of the bottom of defrosting heater 20, collect frost layer on evaporator and melt
The water of change, it is therefore prevented that the refrigeration plant failure caused by water flows into refrigeration plant inside or flowed on defrosting heater 20.
Bend pipe can also be set in heating pipeline 202 bottom, to melt the frost layer condensed in water leg, be by frost layer thawing
Water, then timely discharge, reduce water double evaporation-cooling to condense into the phenomenon of frost layer after steam, improve with defrosting function
The job stability of evaporator.
In addition, the water melted on evaporator can be dropped onto on the transverse tube 2022 at the top of radiating tube, so, transverse tube 2022 is relative
Need to carry out special antiseptic and rustproof processing in other radiating tubes, for example shot-peening or zinc-plated processing are done in surface.
According to one embodiment of the present utility model, it is preferable that radiating fin 204 is aluminum alloy fin and/or copper fin.
According to one embodiment of the present utility model, it is preferable that heating pipeline 202 is ellipticity radiating tube, and ellipticity dissipates
Heat pipe is connected to power supply, passes through power supply heating power.
In addition, the ellipsoid of ellipticity radiating tube can guide heat to be radiated towards the direction of evaporator, its other party is reduced
To heat radiation, improve radiating tubular heat utilization rate.
According to one embodiment of the present utility model, it is preferable that also include：Connecting plate, connecting plate are rectangle structure, if
It is placed between evaporator body 10 and defrosting heater 20.
In the technical scheme, pass through the connecting plate being arranged between evaporator body 10 and defrosting heater 20, connection
The entrance and exit region of defrosting heater 20 and the evaporation tube of evaporator, effectively prevent entrance and the outlet of evaporation tube
Locate frosting so as to improve the refrigeration of evaporator.
In addition, the number and shape size of connecting plate can be set according to the refrigeration work consumption of refrigeration plant, work as refrigeration plant
Refrigeration work consumption it is high when, the frost layer condensed in refrigerator pipes is more, the quantity of increase connecting plate that can be suitably, increases the shape of connecting plate
Shape, still, connecting plate are transferred to the heat of evaporator by heat transfer, it is impossible to influence the refrigeration of evaporator.
The embodiment of second aspect of the present utility model provides a kind of refrigeration plant, including the utility model first aspect
Any one of technical scheme provide the evaporator with defrosting function.
The refrigeration plant that the embodiment of second aspect of the present utility model provides, because being provided with the utility model first aspect
The evaporator with defrosting function of embodiment, so that whole beneficial effects with the above-mentioned evaporator with defrosting function,
It will not be repeated here.
In the utility model, term " first ", " second ", " the 3rd " are only used for the purpose of description, and it is not intended that
Instruction implies relative importance；Term " multiple " then refers to two or more, is limited unless otherwise clear and definite.Term " peace
The term such as dress ", " connected ", " connection ", " fixation " all should be interpreted broadly, for example, " connection " can be fixedly connected, can also
It is to be detachably connected, or is integrally connected；" connected " can be joined directly together, and can also be indirectly connected by intermediary.It is right
For one of ordinary skill in the art, it can understand that specific in the utility model of above-mentioned term containing as the case may be
Justice.
In description of the present utility model, it is to be understood that term " on ", " under ", "left", "right", "front", "rear" etc. refer to
The orientation or position relationship shown be based on orientation shown in the drawings or position relationship, be for only for ease of description the utility model and
Simplify description, rather than the device or unit of instruction or hint meaning there must be specific direction, with specific azimuth configuration
And operation, it is thus impossible to be interpreted as to limitation of the present utility model.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that combining specific features, structure, material or feature that the embodiment or example describe is contained in of the present utility model at least one
In individual embodiment or example.In this manual, identical embodiment is not necessarily referring to the schematic representation of above-mentioned term
Or example.Moreover, specific features, structure, material or the feature of description can be in any one or more embodiments or example
In combine in an appropriate manner.
Preferred embodiment of the present utility model is these are only, is not limited to the utility model, for this area
Technical staff for, the utility model can have various modifications and variations.It is all within the spirit and principles of the utility model,
Any modification, equivalent substitution and improvements made etc., should be included within the scope of protection of the utility model.
Claims (11)
- A kind of 1. evaporator with defrosting function, it is characterised in that including：Evaporator body；Defrosting heater, the bottom of the evaporator body is arranged at, and there is the distance specified, describedization with the evaporator White heater includes heating pipeline and multiple radiating fins, and the multiple radiating fin is sheathed on the heating pipeline, described The pipeline that generates heat is used to carry out defrost to the evaporator body with the multiple radiating fin.
- 2. the evaporator according to claim 1 with defrosting function, it is characterised in thatThe heating pipeline is series pipe, and the series pipe includes multiple transverse tubes and vertical tube, is arranged at the adjacent of inner side Two transverse tubes are connected by U-tube, and the adjacent transverse tube for being arranged at outside is connected with the vertical tube by bending tube.
- 3. the evaporator according to claim 2 with defrosting function, it is characterised in thatAt least one vertical tube extends to the central region of the evaporator.
- 4. the evaporator according to claim 2 with defrosting function, it is characterised in that the multiple radiating fin is equidistant It is distributed on the transverse tube and the vertical tube.
- 5. the evaporator according to claim 4 with defrosting function, it is characterised in that the radiating fin includes rectangular Shape fin, the rectangle fin are socketed on the transverse tube.
- 6. the evaporator according to claim 5 with defrosting function, it is characterised in that the radiating fin includes periphery The ring fin being folded upward at, the ring fin are socketed on the vertical tube.
- 7. the evaporator according to claim 1 with defrosting function, it is characterised in that also include：C-shaped drains water leg, and the C-shaped drainage water leg is arranged at the side of the defrosting heater, and the C-shaped drainage is catchmented The upper horizontal groove of groove is arranged between the evaporator body and the defrosting heater, under the C-shaped drainage water leg Square level trough is arranged at the bottom of the defrosting heater, and the C-shaped drainage water leg is used to collect the liquid formed after defrost.
- 8. the evaporator according to claim 1 with defrosting function, it is characterised in that the radiating fin is aluminium alloy Fin and/or copper fin.
- 9. the evaporator according to claim 1 with defrosting function, it is characterised in thatThe heating pipeline is ellipticity radiating tube, and the ellipticity radiating tube is connected to power supply, is powered and sent out by the power supply Heat.
- 10. the evaporator according to any one of claim 1 to 9 with defrosting function, it is characterised in that also include：Connecting plate, the connecting plate are rectangle structure, are arranged between the evaporator body and the defrosting heater.
- A kind of 11. refrigeration plant, it is characterised in that including：The evaporator with defrosting function as any one of claim 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720128634.4U CN206637895U (en) | 2017-02-13 | 2017-02-13 | Evaporator with defrosting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720128634.4U CN206637895U (en) | 2017-02-13 | 2017-02-13 | Evaporator with defrosting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206637895U true CN206637895U (en) | 2017-11-14 |
Family
ID=60251422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720128634.4U Active CN206637895U (en) | 2017-02-13 | 2017-02-13 | Evaporator with defrosting function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206637895U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108800727A (en) * | 2018-04-19 | 2018-11-13 | 合肥美的电冰箱有限公司 | Defrost component and refrigerating plant |
| CN109869973A (en) * | 2017-12-05 | 2019-06-11 | 松下电器产业株式会社 | Freezing-cooling storeroom |
| CN111023681A (en) * | 2019-12-30 | 2020-04-17 | 长虹美菱股份有限公司 | Refrigerator defrosting device and method thereof |
-
2017
- 2017-02-13 CN CN201720128634.4U patent/CN206637895U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109869973A (en) * | 2017-12-05 | 2019-06-11 | 松下电器产业株式会社 | Freezing-cooling storeroom |
| US10890371B2 (en) | 2017-12-05 | 2021-01-12 | Panasonic Corporation | Freezing refrigerator |
| CN108800727A (en) * | 2018-04-19 | 2018-11-13 | 合肥美的电冰箱有限公司 | Defrost component and refrigerating plant |
| CN111023681A (en) * | 2019-12-30 | 2020-04-17 | 长虹美菱股份有限公司 | Refrigerator defrosting device and method thereof |
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