CN101046341A - Horizontal freezer with defrost function - Google Patents
Horizontal freezer with defrost function Download PDFInfo
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- CN101046341A CN101046341A CN 200610066274 CN200610066274A CN101046341A CN 101046341 A CN101046341 A CN 101046341A CN 200610066274 CN200610066274 CN 200610066274 CN 200610066274 A CN200610066274 A CN 200610066274A CN 101046341 A CN101046341 A CN 101046341A
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Abstract
The horizontal freezer with defrost function includes one cabinet, and compressor, condensator, drying filter, capillary and evaporator connected successively through pipeline in the cabinet. In the pipeline, there is one valve, manual or electric, to short circuiting the condensator, and the valve is connected between the compressor and the condensator and has one end connected through pipe to the evaporator. Normally, the valve is shut off to reach refrigerating aim; and during defrost, the valve is opened to short circuit the condensator and the high temperature compressed refrigerant the compressor exhausts can enter directly to the evaporator for defrosting. The present invention has fast defrosting, and is safe, energy saving, simple and easy in maintenance.
Description
Technical field
The present invention relates to the refrigerator-freezer in a kind of Refrigeration Technique, especially a kind of horizontal chest freezer with defrost function.
Background technology
Application number is 00213279.6 Chinese patent " order of Qufu City hole, Shandong Province is given birth to ", the frostless energy-conservation ice box of a kind of indirect refrigeration is disclosed, its structure is to be made of cabinet, compressor, radiator, evaporimeter, fan, compressor and radiator are arranged on the bottom of cabinet, end at cabinet is provided with cool room, be provided with evaporimeter and fan in the cool room, compressor is positioned at the below of cool room.The frostless energy-conservation ice box of this indirect refrigeration is compared with prior art, because evaporimeter is provided with separately, so avoided pipeline in the prior art to be condensed easily service life that the drawback of aqueous corrosion improved ice box effectively, if in a single day evaporimeter breaks down, because evaporimeter is independently to be arranged in the refrigerating chamber, make maintenance, replacing all convenient.
Application number is 99226431.6 Chinese patent " Shanghai Huaying Technical Glass Co., Ltd. ", discloses a kind of anti-condensation refrigerator-freezer glass.It mainly is made up of glassy layer, and its characteristics are: the rectangular metal frame of hollow is filled with inert gas every between per two glassy layers in the space between two glassy layers and the rectangular metal frame inboard.The utility model can make the energy transmission be subjected to maximum obstruct, and under the effect of inert gas, the thermal convection current that molecular vibration produces significantly reduces, and the thermal resistance of this kind glass reaches the maximum of stack pile glass, and what make energy pass through the value minimum.Overcome traditional refrigerator-freezer effectively under freezing (23 ℃) situation, the glass temperature difference on cabinet surface can produce the problem of condensation.
Application number is 96228482.3 Chinese patent " merchant of Yantai City, Shandong Province can be refined ", discloses a kind of refrigerator-freezer, and it is by cold plate, evaporimeter, flow controller, filter, compressor, condenser, cabinet, the cabinet lid is formed, and is characterized in cold plate, evaporimeter, flow controller, filter are located on the inner face of cabinet lid, filter joins through metal bellows and condenser, and evaporimeter joins by the input pipe of metal bellows and compressor.Compared with prior art, have and blow frost conveniently, need not take out food in the cabinet during defrosting, flow of cold air is good, refrigeration ideal, the advantage of economize on electricity.
Application number is 92207103.9 Chinese patent " Changxingdian, Beijing two or seven communication paddy longevity monarchs of factory, Pu Shumin ", discloses a kind of defroster battery saving arrangement, and it mainly is made up of commutation diode D, filter capacitor C, neon bulb N and unidirectional controllable silicon S CR.It has 5 external connection end (a, b, c, d, e) wherein a, e two termination AC powers, the door switch K2 that c, d two ends attachment add, d termination evaporimeter heater.This device owing to adopted open the door control defrosting and halfwave rectifier technology have been saved refrigerator greatly and have been used to the electric energy that defrosts and consumed, have correspondingly also reduced compressor institute consuming electric power, and have prolonged its life-span.It is applicable to the refrigerator and the refrigerator-freezer of various band defrosters.
Above in the described prior art, some of proposition prevent the way of refrigerator-freezer frosting, or the way of defrosting.In fact, because steam is always arranged in the air, when particularly higher in environment temperature, humidity is big, then because of the casing internal-external temperature difference is bigger, and under the thin situation of thermal insulation layer, the condensation phenomenon appears easily, in case condensation occurs, the existence of frost layer can influence refrigeration system work, reduces refrigeration.
At present, common Defrost mode has manually to be rooted out with defrosting, has to shut down to make frost thawing automatically.Generally, normal anti-dew heat pipe or the heating wire of adopting prevented revealing.The former draws general pipeline from condenser, utilizes the cold-producing medium liberated heat, the surface of normal dewfall is kept or near environment temperature, can be in case reveal.
And the heating wire rule is to utilize a power to be to control with a switch the sticking inboard of applying at the dewfall place on every side of the heating wire of 10-20W.
The fragile evaporimeter of traditional Defrost mode, downtime is longer, and it is also bigger to consume energy, even if power-saving measures is arranged, also will consume certain electric energy, and has dangerous, as to take off courage problem.Therefore, it is safe and simple how defrosting mode accomplishes, easy-maintaining becomes a problem of current research again.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, and a kind of horizontal chest freezer with defrost function fast, safe, energy-conservation, easy, easy-maintaining that defrosts is provided.
For solving the problems of the technologies described above, the present invention adopts the basic design of technical scheme to be: a kind of horizontal chest freezer with defrost function, comprise cabinet, be in series with compressor, condenser, device for drying and filtering, capillary, evaporimeter successively by pipeline on cabinet, it is characterized in that: being connected with on the described pipeline that is in series with compressor, condenser, device for drying and filtering, capillary, evaporimeter can be with the valve of condenser short circuit.
Described can be a manual or electronic three-way valve with the valve of condenser short circuit, this manual or electronic three-way valve is connected on the pipeline between compressor and the condenser, and another joint of this manual or electronic three-way valve directly is connected with evaporimeter by pipeline.
Described can be a manual or electronic one-way cock with the valve of condenser short circuit, and a joint of this manual or electronic one-way cock is connected with compressor, and another joint directly is connected with evaporimeter by pipeline.
The coil pipe of described evaporimeter is horizontal layout, and be fixed on the cabinet liner around, this cabinet liner and its evaporimeter that is fixed together are placed in the cabinet.
Described valve is fixedly connected on the sidewall of cabinet, and the fixed valve place is provided with the groove that concaves on this cabinet sidewall.
The periphery of described valve is provided with the boss that can be connected with cabinet, is provided with sealing gasket between this boss and the cabinet sidewall.
The described valve that is fixedly connected on the cabinet sidewall stretches out on the direction perpendicular to sidewall, and its valve switch is positioned at the groove of cabinet sidewall, and the outside end face of valve switch is mutually concordant with the lateral surface of cabinet or be lower than the lateral surface of cabinet.
The upper end, two side that described cabinet liner is relative is equipped with and lifts handle.
After adopting technique scheme, because the present invention has the horizontal chest freezer of defrost function, having connected on the described pipeline that is in series with compressor, condenser, device for drying and filtering, capillary, evaporimeter can be with the valve of condenser short circuit, i.e. two kinds of embodiments of three-way valve or one-way cock.This valve is in closed condition when the normal refrigeration work of refrigerator-freezer, promptly compressor does not directly communicate with evaporimeter, keeps the regular path of this refrigeration piping, reaches the purpose of refrigeration, and refrigerator-freezer is normally moved.When needs defrost, just valve open promptly can be opened three-way valve or one-way cock, make the condenser short circuit, compressor directly communicates with condenser.The capillary resistance that is connected on the pipeline of evaporimeter is bigger because condenser passes to, and the high temperature compressed cold-producing medium that compressor is discharged just directly leads to the coil pipe of evaporimeter, thereby the frost layer in the refrigerator-freezer is carried out heating and melting.Because the hot air temperature that compressor is discharged is higher, generally has tens degrees centigrade, heat transfer temperature is big, and heating is fast, and the speed of hot gas defrosting is also fast.Because the whole uniform winding of coil pipe of evaporimeter are around the cabinet liner, the heating nature is even, as long as very thin one deck rime ice that will contact with liner like this thawing, the rime ice of monoblock will break away from the cabinet liner under gravity and artificial effect, reach the purpose of defrosting, defrosting effect might as well.Because what install on pipeline is manual or electronic valve, defrosting can freely be controlled by artificial or electronic, both exempted the tired bitter of manual shovel frost, saved electric heater unit again, overcome that prior art adopts that the resistance wire heating brought dangerous, take off the courage problem.Obviously has fast, safe, energy-conservation, easy, the effect for ease of maintenaince of defrosting.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Description of drawings
Fig. 1 is first kind of embodiment structural representation of horizontal chest freezer that the present invention has defrost function;
Fig. 2 is second kind of embodiment structural representation of horizontal chest freezer that the present invention has defrost function;
Fig. 3 is a pipe connecting structure principle schematic among Fig. 1;
Fig. 4 is a pipe connecting structure principle schematic among Fig. 2;
Fig. 5 is the vertical partial sectional view of cabinet sidewall among Fig. 1 or Fig. 2;
Fig. 6 is a valve mounting structure schematic diagram on the cabinet sidewall among Fig. 1 or Fig. 2.
The specific embodiment
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the present invention is a kind of to have in the structural representation of horizontal chest freezer of defrost function, the loam cake of refrigerator-freezer is not drawn, its structure comprises cabinet 10, is in series with compressor 2, condenser 4, device for drying and filtering 3, capillary 6, evaporimeter 1 successively by pipeline 7 on cabinet 10.Its principal character is being that be connected with on the described pipeline 7 that is in series with compressor 2, condenser 4, device for drying and filtering 3, capillary 6, evaporimeter 1 can be with the valve of condenser 4 short circuits.
The described valve of condenser 4 short circuits can being arranged on has two kinds of embodiments on the pipeline 7.
First kind of embodiment is, described can be a manual or electronic three-way valve 5 (consulting Fig. 1 and Fig. 3) with the valve of condenser 4 short circuits, this manual or electronic three-way valve 5 is connected on the pipeline 7 between compressor 2 and the condenser 4, and another joint of this manual or electronic three-way valve 5 directly is connected with evaporimeter 1 by pipeline 7 '.This manual or electronic three-way valve 5 is opened when pipeline 7 ' is connected, because the capillary 6 that condenser 4 connects to the pipeline of evaporimeter 1, its resistance is bigger, and the high temperature compressed cold-producing medium that compressor 2 is discharged will directly lead to evaporimeter 1, thereby reaches the purpose of defrosting.
Second kind of embodiment is, described can be a manual or electronic one-way cock 5 ' (consulting Fig. 2 and Fig. 4) with the valve of condenser 4 short circuits, one joint of this manual or electronic one-way cock 5 ' is connected with compressor 2 by pipeline 7 ', and another joint is by pipeline 7 " directly be connected with evaporimeter 1.This manual or electronic one-way cock 5 ' is opened and is made pipeline 7 ', 7 " when connecting; because condenser 4 is connected with capillary 6 to the pipeline of evaporimeter 1; its resistance is bigger, the high temperature compressed cold-producing medium that compressor 2 is discharged will directly lead to evaporimeter 1, thereby reaches the purpose of defrosting.
Above described electronic three-way valve 5 or electronic one-way cock 5 ', present embodiment is three-way solenoid valve door or electromagnetism one-way cock.As Fig. 1, Fig. 2 and shown in Figure 5, a kind of horizontal chest freezer of the present invention with defrost function, the coil pipe of wherein said evaporimeter 1 is horizontal layout, and be fixed on cabinet liner 12 around, this cabinet liner 12 and its evaporimeter that is fixed together 1 are placed in the cabinet 10.Be equipped with in described cabinet liner 12 relative upper ends, two side and lift handle 8, lifting handle 8 by this can utilize artificial or plant equipment proposes cabinet liner 12 and evaporimeter 1 or put into, be convenient to cleaning and maintenance, should disconnect the pipeline that connects evaporimeter 1 this moment.The arrangement of this evaporimeter 1 around ring helps the even heating in defrost process, and defrosting effect might as well.
A kind of horizontal chest freezer of the present invention with defrost function, for the ease of operation, described valve 5,5 ', i.e. three-way valve 5 or one-way cock 5 ', be fixedly connected on the sidewall of cabinet 10 (consulting Fig. 6), fixed valve 5,5 ' locates to be provided with the groove 13 that concaves on these cabinet 10 sidewalls.Described valve 5,5 ' periphery, it is the periphery of three-way valve 5 or one-way cock 5 ', be provided with the boss 9 that can be connected, on this boss 9, can be fixed on the sidewall of cabinet 10 (not drawing among the figure), be provided with sealing gasket 11 between the sidewall of this boss 9 and cabinet 10 by screw with cabinet.Described three-way valve 5 or the one-way cock 5 ' that is fixedly connected on cabinet 10 sidewalls stretches out on the direction perpendicular to sidewall, its valve switch 14 is arranged in the groove 13 of cabinet 10 sidewalls, the outside end face of valve switch 14 is mutually concordant with the lateral surface of cabinet 10 or be lower than the lateral surface of cabinet, both be convenient to operation, do not taken space outerpace again.
The present invention has the operation principle of the horizontal chest freezer of defrost function.
When the refrigerator-freezer operate as normal, close valve 5,5 ' (consulting Fig. 3 and Fig. 4) on the refrigeration piping, promptly three-way valve 5 or one-way cock 5 ' are in closed condition when refrigerator-freezer normally freezes.
A kind of horizontal chest freezer with defrost function of the present invention can adopt vapourator full-liquid formula refrigerating plant, as shown in Figure 3 and Figure 4, comprising: horizontal coiled-tube evaporimeter 1, refrigeration compressor 2, condenser 4, device for drying and filtering 3, capillary 6.The outlet of described refrigeration compressor 2 connects condenser 4, compressed liquid high temperature refrigerant becomes the low temperature liquid cold-producing medium by condenser 4, the output of described condenser 4 connects the end opening of evaporimeter 1 by device for drying and filtering 3, capillary 6, the liquid refrigerant that drying is filtered expands rapidly in evaporimeter, become gaseous state by liquid state, absorb a large amount of heats, thereby reach the purpose of refrigeration, and gaseous refrigerant is got back to the inlet of refrigeration compressor 2 by the cooled via return air pipe suitable for reading of evaporimeter.
Owing to be provided with capillary in the loop, described capillary is connected between described device for drying and filtering 3 and horizontal coiled-tube evaporimeter 1 end opening.Effect capillaceous is an expenditure and pressure, and also available expansion valve replaces capillary in the loop, and described expansion valve is connected between described device for drying and filtering and the horizontal coiled-tube evaporimeter end opening.
Under keep supplying back or on under in the return device refrigerating plant, after condensed refrigerant is passed through capillary-compensated again,, carry out one and enclose upwards full-liquid type evaporation from evaporimeter end opening or the evaporimeter that enters suitable for reading, suitable for reading or end opening advances the muffler group from evaporimeter, arrives press again; Evaporated liquor is under same pressure of inspiration(Pi), and the gravity effect of itself in addition makes the cold-producing medium that does not have evaporation also stay the evaporimeter bottom or evaporate on top, and the cold-producing medium in this evaporimeter can be walked from the bottom up, and major part is to walk from top to bottom.Unit interval inner refrigerant evaporite ratio is more abundant, and the heat transfer coefficient of evaporimeter is brought up to 8000KW/M
2Thereby, improved the unit interval refrigerating capacity, the working time of press reality is reduced, reduced energy consumption.
When needs defrosting or when defrosting, open valve 5,5 ' (consulting Fig. 3 and Fig. 4), i.e. three-way valve 5 or one-way cock 5 ' on the refrigeration piping by valve switch 14.Make condenser 4 short circuits, compressor 2 directly communicates with evaporimeter 1.This moment since condenser 4 to pass to capillary 6 resistances that connected on the pipeline of evaporimeter 1 bigger, the high temperature compressed cold-producing medium that compressor 2 is discharged just directly leads to the coil pipe of evaporimeter 1, thereby the frost layer in the cabinet is carried out heating and melting.Because the high temperature compressed cold-producing medium hot air temperature that compressor is discharged is higher, generally has tens degrees centigrade, heat transfer temperature is big, and heating is fast, and the speed of hot gas defrosting is also fast.Since the coil pipe of evaporimeter 1 be evenly arranged in the cabinet liner around, be that evaporimeter all is wound on the cabinet liner 12, heat more even, as long as very thin one deck rime ice that will contact with liner 12 like this melts, the rime ice of monoblock will break away from cabinet liner 12 under gravity and artificial effect, reach the purpose of defrosting, defrosting effect is good.Because what install on pipeline is manual or electronic valve, defrosting time can freely be controlled or adds that timer controls by artificial or electronic.Therefore need to absorb a large amount of heats in the ice-out process, the frost of monoblock or ice need manually they to be cleared up the refrigerator outside with instrument after will breaking away from the cabinet liner.So the tired bitter of manual shovel frost exempted in defrosting or defrosting, owing to utilized the heat energy of compressor in the defrost process, saved electric heater unit, and be obviously energy-conservation.Operation is safety but also easy not only, overcome effectively that prior art adopts that the resistance wire heating brought dangerous, take off the courage problem.Also can reach purpose for ease of maintenaince simultaneously.Therefore main feature of the present invention is that defrosting is fast, safe, energy-conservation.
Claims (8)
1, a kind of horizontal chest freezer with defrost function, comprise cabinet, be in series with compressor, condenser, device for drying and filtering, capillary, evaporimeter successively by pipeline on cabinet, it is characterized in that: being connected with on the described pipeline that is in series with compressor, condenser, device for drying and filtering, capillary, evaporimeter can be with the valve of condenser short circuit.
2, a kind of horizontal chest freezer according to claim 1 with defrost function, it is characterized in that: described can be a manual or electronic three-way valve with the valve of condenser short circuit, this manual or electronic three-way valve is connected on the pipeline between compressor and the condenser, and another joint of this three-way valve directly is connected with evaporimeter by pipeline.
3, a kind of horizontal chest freezer according to claim 1 with defrost function, it is characterized in that: described can be a manual or electronic one-way cock with the valve of condenser short circuit, one joint of this manual or electronic one-way cock is connected with compressor, and another joint directly is connected with evaporimeter by pipeline.
4, a kind of horizontal chest freezer according to claim 1 with defrost function, it is characterized in that: the coil pipe of described evaporimeter is horizontal layout, and be fixed on the cabinet liner around, this cabinet liner and its evaporimeter that is fixed together are placed in the cabinet.
5, a kind of horizontal chest freezer according to claim 1 with defrost function, it is characterized in that: described valve is fixedly connected on the sidewall of cabinet, and the fixed valve place is provided with the groove that concaves on this cabinet sidewall.
6, a kind of horizontal chest freezer with defrost function according to claim 1, it is characterized in that: the periphery of described valve is provided with the boss that can be connected with cabinet, is provided with sealing gasket between this boss and the cabinet sidewall.
7, a kind of according to claim 1 or 5 horizontal chest freezer with defrost function, it is characterized in that: the described valve that is fixedly connected on the cabinet sidewall stretches out on the direction perpendicular to sidewall, its valve switch is positioned at the groove of cabinet sidewall, and the outside end face of valve switch is mutually concordant with the lateral surface of cabinet or be lower than the lateral surface of cabinet.
8, a kind of horizontal chest freezer with defrost function according to claim 4, it is characterized in that: the upper end, two side that described cabinet liner is relative is equipped with and lifts handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610066274 CN101046341A (en) | 2006-03-31 | 2006-03-31 | Horizontal freezer with defrost function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610066274 CN101046341A (en) | 2006-03-31 | 2006-03-31 | Horizontal freezer with defrost function |
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| CN101046341A true CN101046341A (en) | 2007-10-03 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101984312A (en) * | 2010-11-23 | 2011-03-09 | 深圳和而泰智能控制股份有限公司 | Refrigerator defrosting system and method |
| CN101424471B (en) * | 2007-10-31 | 2012-11-28 | 布莱沃公司 | Cooling plant |
| CN103518105A (en) * | 2011-01-07 | 2014-01-15 | 热之王公司 | Refrigeration system with a distributor having a flow control mechanism and a method for controlling such a system |
| CN104132498A (en) * | 2014-08-05 | 2014-11-05 | 滁州富达机械电子有限公司 | Water chiller system capable of being automatically defrosted by heat of compressor |
| CN107543350A (en) * | 2017-09-09 | 2018-01-05 | 郭颂怡 | Cooling device |
| CN107965955A (en) * | 2017-11-22 | 2018-04-27 | 合肥华凌股份有限公司 | Frost-removal structure and its operating method and refrigeration plant |
| CN108430277A (en) * | 2015-12-22 | 2018-08-21 | 开利公司 | Refrigerate selling device |
| CN108571850A (en) * | 2018-06-30 | 2018-09-25 | 辜洁龙 | A kind of high practicability low cost refrigerator-freezer that can be achieved automatically to defrost |
| CN109307394A (en) * | 2018-08-06 | 2019-02-05 | 青岛海尔特种电冰柜有限公司 | Horizontal type wind-cooling refrigerating cabinet |
| CN109307393A (en) * | 2018-08-06 | 2019-02-05 | 青岛海尔特种电冰柜有限公司 | Horizontal type wind-cooling refrigerating cabinet |
| CN109737662A (en) * | 2018-12-25 | 2019-05-10 | 西安交通大学 | A kind of horizontal frostless refrigeration system of refrigerator of compact and defrosting control method |
| CN113639412A (en) * | 2021-07-15 | 2021-11-12 | 青岛海尔空调器有限总公司 | Method for controlling self-cleaning outside pipe of indoor heat exchanger |
| CN114270120A (en) * | 2019-08-28 | 2022-04-01 | 普和希株式会社 | Cold insulation box |
-
2006
- 2006-03-31 CN CN 200610066274 patent/CN101046341A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101424471B (en) * | 2007-10-31 | 2012-11-28 | 布莱沃公司 | Cooling plant |
| CN101984312A (en) * | 2010-11-23 | 2011-03-09 | 深圳和而泰智能控制股份有限公司 | Refrigerator defrosting system and method |
| CN103518105A (en) * | 2011-01-07 | 2014-01-15 | 热之王公司 | Refrigeration system with a distributor having a flow control mechanism and a method for controlling such a system |
| CN104132498A (en) * | 2014-08-05 | 2014-11-05 | 滁州富达机械电子有限公司 | Water chiller system capable of being automatically defrosted by heat of compressor |
| CN108430277A (en) * | 2015-12-22 | 2018-08-21 | 开利公司 | Refrigerate selling device |
| CN108430277B (en) * | 2015-12-22 | 2021-04-02 | 开利公司 | Refrigerated merchandiser |
| CN107543350A (en) * | 2017-09-09 | 2018-01-05 | 郭颂怡 | Cooling device |
| CN107965955A (en) * | 2017-11-22 | 2018-04-27 | 合肥华凌股份有限公司 | Frost-removal structure and its operating method and refrigeration plant |
| CN108571850A (en) * | 2018-06-30 | 2018-09-25 | 辜洁龙 | A kind of high practicability low cost refrigerator-freezer that can be achieved automatically to defrost |
| CN109307394A (en) * | 2018-08-06 | 2019-02-05 | 青岛海尔特种电冰柜有限公司 | Horizontal type wind-cooling refrigerating cabinet |
| CN109307393A (en) * | 2018-08-06 | 2019-02-05 | 青岛海尔特种电冰柜有限公司 | Horizontal type wind-cooling refrigerating cabinet |
| CN109737662A (en) * | 2018-12-25 | 2019-05-10 | 西安交通大学 | A kind of horizontal frostless refrigeration system of refrigerator of compact and defrosting control method |
| CN114270120A (en) * | 2019-08-28 | 2022-04-01 | 普和希株式会社 | Cold insulation box |
| CN114270120B (en) * | 2019-08-28 | 2023-08-18 | 普和希株式会社 | Cold insulation box |
| CN113639412A (en) * | 2021-07-15 | 2021-11-12 | 青岛海尔空调器有限总公司 | Method for controlling self-cleaning outside pipe of indoor heat exchanger |
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Open date: 20071003 |