CN102435027A - Air source heat pump ultrasonic resonance defrosting method based on intermittent loading work - Google Patents
Air source heat pump ultrasonic resonance defrosting method based on intermittent loading work Download PDFInfo
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Abstract
The invention discloses an air source heat pump ultrasonic resonance defrosting method based on an intermittent loading work. The method comprises the following steps of: arranging an ultrasonic transducer on an evaporator; regulating the ultrasonic transducer and making the ultrasonic transducer in harmonic working state; testing a harmonic frequency by using an impedance analyzer or using a sweeping frequency encourage mode; and driving the ultrasonic transducer to perform ultrasonic defrosting according to an intermittent loading mode by using an ultrasonic power supply. The air source heat pump ultrasonic resonance defrosting method has better effect when the method is applied to the frosting initial period of the air source heat pump; by using the continuous on-line work of intermittent ultrasonic vibration which has optimized period and working time, the air source heat pump ultrasonic resonance defrosting method has good defrosting effect and anti-frosting effect, the continuous long-time high-efficient heat exchanging rate of the evaporator is ensured, the problems that a conventional defrosting method has large energy consumption, temperature fluctuation, noise and the like are solved. The air source heat pump ultrasonic resonance defrosting method improves the reliability of an ultrasonic system and has obvious energy-saving effect.
Description
Technical field
The present invention relates to the defrosting of air source heat pump evaporation device and suppress the frosting technical field, particularly based on the air source heat pump ultrasound wave resonance Defrost method of batch (-type) loading work.
Background technology
Evaporimeter is based on a critical component of the refrigeration system of air source heat pump structure; Fin gap (air duct of evaporimeter) is stopped up in the surperficial frosting meeting of heat pump air side evaporimeter; Reduce the air mass flow between fin, increase the thermal resistance of evaporimeter, reduced the heat exchange efficiency of evaporimeter.
At present evaporimeter mainly adopts the Defrost method of heating defrosting, comprises that the reverse hot gas defrosting of cross valve and electrical heating defrost, when deposit on the evaporimeter white abundant the time, just open defrost function.When air-conditioning heated in the winter time, heating defrost stage compression machine stopped indoor heating, causes temperature to descend, and influences indoor comfort degree; And air-cooler, refrigerator be when the heating defrost, and the article of storage influence because of the recurrent fluctuations that receives temperature, the decline that brings storage quality.
Power ultrasonic mainly refers to be higher than 15kHz, amplitude is little, energy is big, the difficult a kind of sound wave directly heard of people's ear.Power ultrasonic can bring out mechanical oscillation effect, fuel factor and cavitation effect.Speed that power ultrasonic is propagated in solid and power capability are all much larger than aerial transmission capacity; Can cause tangible mechanical oscillation effect; It is converted into mechanical oscillation with ultrasonic acoustic energy, makes small items generation short arc, the high-frequency vibration on solid dielectric and solid dielectric surface.In addition, show that power ultrasonic also has acceleration and thaws, influences special physical effects such as crystallization property and process according to relevant research.
Japan Adachi; Scholars such as K apply ultrasonic extensional vibration continuously through transducer and horn (20mm*92.6mm*1.9mm) on aluminum strip mode suppresses the frosting effect with research; Find in the test that the ultrasonic vibration that applies frequency and be 37kHz, peak swing and be 3.1 μ m can reduce on the aluminium flake by 60% frosting degree.
Domestic Yan industry etc. has been introduced the ultrasound wave defrosting of air-cooler, can guarantee air-cooler 48 hours frostless blocking up of operation continuously, still has the gap of 2-3mm between fin, but mounting means and hyperacoustic load mode of transducer are not described in the paper.
The Italy scholar pastes a plurality of piezoelectric patches on each fin of the evaporimeter of a big spacing of fin, rely on the continuous ultrasound of piezoelectric patches to vibrate the frosting that defrosts/suppress.
Korea S Samsung Electronics has applied for the defrosting patent of evaporator of refrigerator, relies on the vibration defrosting (mechanical oscillation) of a plurality of ultrasonic vibrators, but the load mechanism of ultrasonic vibration is not described.
South Korea's LG Electronics Inc has proposed to adopt the defroster patent of ultrasonic reflections, relies on the aerial propagation of ultrasonic wave, reflection, to frosting object radiation ultrasonic wave, in object, realizes defrosting through osmotic heat.
The Lu Zhi of Shanghai Communications University etc. has mentioned the employing probe as trigger condition in patent, when frost layer reaches 1mm, start ultrasonicly, relies on the mode of ultrasonic vibration to defrost, but the load mechanism of ultrasonic vibration is not described.
Southeast China University's Chen Zhen universe has been introduced the method for propagate ultrasound waves inhibition frosting in air, and ultrasonic wave is loaded as continuous loading.
Present ultrasonic defrosting and inhibition frosting Study on Technology are mainly through two approach, and the first relies on ultrasonic wave in air, to propagate, and make that near the steam the huyashi-chuuka (cold chinese-style noodles) forms turbulent the fluctuation, and the interfere with water steam is in the formation of the frost of huyashi-chuuka (cold chinese-style noodles); It two is to rely on the mechanical oscillation effect that propagate ultrasound waves causes in the solid.Transducer type selecting principle, installation method and the working mechanism parameter of two kinds of approach when being used to defrost is indeterminate, and cause can't commercialization.Simultaneously, ultrasonic transducer is in high-power down continuous operation, and sharply heating is prone to cause the damage of transducer and ultrasonic power, and causes that the resonant frequency of transducer drifts about the decline of power delivery efficiency significantly.
Summary of the invention
In order to overcome the defective of above-mentioned prior art; The object of the present invention is to provide air source heat pump ultrasound wave resonance Defrost method based on batch (-type) loading work; Adopting power ultrasonic to produce short arc, high frequency, high acceleration vibration puts on evaporator surface and defrosts or suppress frosting; Vibration applies the service intermittent mode of employing based on time mechanism, and the concrete resting period confirms according to environment temperature, humidity and duty with the Shi Zhen time, and is consistent with the intrinsic frequency of the hoar crystal body of assurance ultrasonic frequency vibratory and growth; Realize high efficiency resonance defrosting, and have good energy-conservation consumption reduction effect.
For achieving the above object, technical scheme of the present invention is achieved in that
Air source heat pump ultrasound wave resonance Defrost method based on batch (-type) loading work; On evaporimeter, install ultrasonic transducer additional; The adjustment ultrasonic transducer is in the resonance duty; Resonant frequency is measured through electric impedance analyzer or swept frequency excitation mode, carries out ultrasonic defrosting by the ultrasonic-frequency power supply drive ultrasonic transducer according to the batch (-type) load mode.
Described ultrasonic transducer comprises the ultrasonic transducer of piezoelectric patches, sandwich PZT (piezoelectric transducer) and magnetostriction type; The type of ultrasonic vibration comprises employing extensional vibration and radial vibration mode; It is 15kHz-200kHz that the extensional vibration frequency is selected scope for use, and it is 20kHz-4MHz that the radial vibration frequency is selected scope for use.
Described ultrasonic-frequency power supply has the automatic frequency tracking function, with the ultrasonic resonance of better assurance.
Described batch (-type) load mode is the service intermittent mechanism based on time control, adopts intermittent continuous or impact type intermittently, after the certain time interval T 1 of intermittent continuous finger interval; Continuous shaking time T 2; Be to be T1 time resting period, the working time is T2, and T1 >=T2; Intermittently impact type refers to behind the certain hour at interval the pattern according to the discontinuous method work in the short time, in the short time period of correspondence during T2 work, and intermittent time definition of T 1 ', the working time is set at T2 ', and T1 ' >=T2 '.
Described service intermittent mechanism based on time control is the self-sow rule according to the hoar crystal body; Approaching or identical time zone applies ultrasonic vibration to the intrinsic frequency of selecting hoar crystal body self with ultrasonic frequency vibratory; Utilize resonance effects to realize that the early stage hoar crystal body that forms of evaporator surface, frost branch and frost layer fracture and come off; Realizing the frostless or few frost of evaporator surface, is evaporimeter ambient air temperature＞-5 ℃ under the fireballing operating mode of frosting, under the condition of relative air humidity＞50%; The free convection wind speed is less than 2m/s; The evaporator surface temperature from original ambient temperature be reduced to stable before, the ratio of intermittent time T1 and working time T2 can be made as: 1≤T1/T2≤8, and T2＜1 minute; In frosting speed is evaporimeter ambient air temperature＜-5 ℃ slowly; Under relative air humidity＞30%, the operating mode of forced convertion wind speed greater than 2m/s; After the evaporator surface temperature was relatively stable, intermittent time T1 and working time T2 ratio were made as: 1≤T1/T2≤20, and T2＜1 minute.
Described intermittence, impact type was followed under above intermittent time T1 and the working time T2 setting principle, need guarantee that the each attack time T2 ' in the working time section should be no more than for 10 seconds.
During the real work of ultrasonic resonance defrost system, the air humidity that humidity sensor detects the evaporimeter surrounding environment can be set, temperature sensor be set detect evaporator surface and evaporimeter environment temperature on every side; Start beginning first from compressor, promptly start ultrasonic vibration, the ultrasonic vibration mode adopts step working mechanism, and the time of vibration in each cycle is set to [5,60] s, and ultrasonic intermittent time T1=[10s, 5min]; And when the evaporator surface temperature be reduced to stable after, intermittent time T1=[5, the 20] min of ultrasonic vibration; The humidity size of evaporimeter surrounding environment is as the most important condition of ultrasonic intervention, and the temperature difference of evaporator surface and evaporimeter surrounding environment is as the second condition of ultrasonic vibration intervention.When evaporimeter ambient humidity during less than setting value (as: 30%), power ultrasonic is not worked; Have only when ambient humidity during greater than setting value, power ultrasonic just can be introduced; Humidity around the evaporimeter is bigger, the temperature difference of evaporimeter and surrounding air is big more, the easier frosting of evaporator surface, and at this moment, the intermittent time T1 of ultrasonic vibration should shorten.
The present invention adopt that power ultrasonic causes by a narrow margin, high frequency, high acceleration mechanical oscillation defrost; A kind of air source heat pump ultrasound wave resonance Defrost technology based on batch (-type) loading work is proposed; Improve the effect of defrosting/inhibition frosting; And reduce the energy consumption that defrosts, and can guarantee the safety of ultrasonic system.
Description of drawings
Fig. 1 is the work sketch map of ultrasonic vibration batch (-type) loading mode, and wherein Fig. 1 a is the intermittent continuous work sketch map of ultrasonic vibration, and Fig. 1 b is an intermittently impact type work sketch map of ultrasonic vibration.
Fig. 2 is the ultrasonic transducer scheme of installation.
Fig. 3 be different intermittently than the ultrasonic vibration effect under frosting change procedure on the evaporator fin; Fig. 3 a is the natural frosting process; Fig. 3 b is the effect of continuous ultrasound vibration; Fig. 3 c is 1 minute a process of continuous shaking in 4 minutes at intermittence, and Fig. 3 d is 1 minute a process of continuous shaking in 8 minutes at intermittence, and wherein the abscissa of each figure has been represented the working time of compressor.
Fig. 4 be different intermittently than the ultrasonic vibration effect under the white thick time dependent correlation curve of fin both sides.
Fig. 5 has shown that the frosting of having adopted on the fin of 1 minute front and back of ultrasonic vibration changes, and wherein 5a is the frosting on the preceding fin of vibration, and Fig. 5 b is vibration frosting on the fin after a minute, and Fig. 5 c is the hoar crystal volume image of removing.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described in detail.
Air source heat pump ultrasound wave resonance Defrost method based on batch (-type) loading work; With reference to Fig. 2; On evaporimeter, install ultrasonic transducer additional; It is in the resonance duty adjustment ultrasonic transducer, and resonant frequency is measured through electric impedance analyzer or swept frequency excitation mode, carries out ultrasonic defrosting by the ultrasonic-frequency power supply drive ultrasonic transducer according to the batch (-type) load mode.
Described ultrasonic transducer comprises the ultrasonic transducer of piezoelectric patches, sandwich PZT (piezoelectric transducer) and magnetostriction type; The type of ultrasonic vibration comprises employing extensional vibration and radial vibration mode; It is 15kHz-200kHz that the extensional vibration frequency is selected scope for use, and it is 20kHz-4MHz that the radial vibration frequency is selected scope for use.
Described ultrasonic-frequency power supply has the automatic frequency tracking function, with the ultrasonic resonance of better assurance.
Be embodied as: compressor adopts the R600a refrigerant, and evaporimeter is a copper pipe aluminum fin type structure, is made up of single copper pipe, and size is 30cm*30cm, and the fin average headway is 1.55mm.Top end at a side metal casing of evaporimeter has been installed the sandwich PZT (piezoelectric transducer) of an extensional vibration through bolt and ultrasonic special glue, and the width of metal casing is 1.5cm.The centre frequency of transducer is that 28kHz, power are 60W, and its radiating surface is tubaeform, front end face diameter 60mm.The mensuration of environment temperature and evaporator surface temperature has adopted thermocouple thermometer, and the mensuration of air humidity has adopted the portable warm hygrometer.The intermittent time of transducer work and working time are regulated the timer that has adopted single-chip microcomputer and cooperate the work of relay control ultrasonic-frequency power supply to realize.Be provided with the dynamic microscopic change of microscope camera system among Fig. 2 with frosting on the record fin.
Described batch (-type) load mode is the service intermittent mechanism based on time control, adopts intermittent continuous or impact type intermittently, after the certain time interval T 1 of intermittent continuous finger interval; Continuous shaking time T 2; Be to be T1 time resting period, the working time is T2, and T1 >=T2; Intermittently impact type refers to behind the certain hour at interval the pattern according to the discontinuous method work in the short time, in the short time period of correspondence during T2 work, and intermittent time definition of T 1 ', the working time is set at T2 ', and T1 ' >=T2 '.
Described service intermittent mechanism based on time control is the self-sow rule according to the hoar crystal body; Approaching or identical time zone applies ultrasonic vibration to the intrinsic frequency of selecting hoar crystal body self with ultrasonic frequency vibratory; Utilize resonance effects to realize that the early stage hoar crystal body that forms of evaporator surface, frost branch and frost layer fracture and come off; Realizing the frostless or few frost of evaporator surface, is evaporimeter ambient air temperature＞-5 ℃ under the fireballing operating mode of frosting, under the condition of relative air humidity＞50%; The free convection wind speed is less than 2m/s; The evaporator surface temperature from original ambient temperature be reduced to stable before, the ratio of intermittent time T1 and working time T2 can be made as: 1≤T1/T2≤8, and T2＜1 minute; In frosting speed is evaporimeter ambient air temperature＜-5 ℃ slowly; Under relative air humidity＞30%, the operating mode of forced convertion wind speed greater than 2m/s; After the evaporator surface temperature was relatively stable, intermittent time T1 and working time T2 ratio were made as: 1≤T1/T2≤20, and T2＜1 minute.
With reference to shown in Figure 2, shown a sketch map that ultrasonic vibration defrosting pilot system is implemented, device is described below among the figure: 1-transmits the copper pipe of refrigerant, 2-compressor, 3-capillary; The 4-condenser, 5-choke valve, 6-evaporimeter, 7-thermometer, 8-relative air humidity meter; The 9-air thermometer, 10-humiture conditioning module, 11-microcontroller, 12-ultrasonic power; The 13-piezoelectric type ultrasonic transducer, 14-microscope, 15-CCD camera, 16-computer
Wherein 1-6 has constituted compressor cooling frosting device, and 7-11 has constituted the measurement mechanism of humiture, and 11-13 has constituted the generation and the control device of ultrasonic vibration, and 14-16 has constituted the microimaging device.
Wherein, evaporimeter 6 is the common commercial wing-tubular evaparator (air-conditioning, refrigerator etc. are used) that gets, and its both sides are provided with metal end plate.2,4,5; 6 through 1 and 3 be connected in series, and constituted a small refrigeration systems based on compressor, on the metal end plate top of a side of evaporimeter 6 ultrasonic transducer 13 of a piezoelectric type has been installed; Evaporimeter 6 is provided with temperature sensor 7; Other is provided with air thermometer 8 and relative air humidity meter 9, and the temperature and humidity signal converts voltage signal into through humiture conditioning module 10, sends into microcontroller 11 and carries out A/D conversion and numerical operation; And according to predefined service intermittent mechanism, control ultrasonic power 12 drive ultrasonic transducer 13 realize step dither.Image during frosting is sent into CCD camera 15 after amplifying through microscope 14, and the frosting image that amplifies afterwards can show and preserves at computer 16.
With reference to shown in Figure 3; In environment temperature is that 6 ℃, relative air humidity are that (air-conditioning frozen condition) carries out the ultrasound wave defrostings test of different intermittently mechanism under the situation of easy frosting of 80% left and right sides low temperature, high humidity, contrast under the working time same case, the ultrasound wave defrosting effects of different intermittent times.Adopted intermittent continuous ultrasonic vibration pattern in the test, the intermittent time be set to respectively 0 minute (continuous shaking), 4 minutes, 5 minutes and 8 minutes, the working time of ultrasonic vibration is set at 1 minute under every kind of pattern.During compressor start,, open ultrasonic vibration, obtained the microexamination procedure chart of frosting in the test according to predetermined mechanisms.
With reference to shown in Figure 4; Frosting thickness contrast statistics based on test; The frosting thickness that has shown the evaporator fin both sides under the ultrasonic vibration effect of ratio at different intermittence is curve over time; Shown that the ultrasonic vibration effect can significantly reduce the fin frosting, and the ultrasonic vibration of suitable gap ratio is superior to the defrosting effect of continuous shaking and big intermittent time.
With reference to shown in Figure 5, adopt image process method to show the situation of change of the long-pending frost on the fin of one minute front and back of ultrasonic continuous shaking.Fig. 5 a has shown the frosting on the fin before the vibration, and Fig. 5 b has shown frosting situation on the fin after the vibration, and Fig. 5 c has shown the hoar crystal body that shook in the clock time and in a minute in ultrasonic vibration.
Described intermittence, impact type was followed under above intermittent time T1 and the working time T2 setting principle, need guarantee that the each attack time T2 ' in the working time section should be no more than for 10 seconds.
In sum, Fig. 1 has shown the intermittent continuous characteristics that load with the ultrasonic vibration of impact type intermittently, and the operating voltage curve approximation of ultrasonic transducer when resonance be sine wave, and the sine wave among the figure has been represented the alternating voltage that loads on two electrodes of transducer.
Shown in Fig. 1 a, intermittent continuous ultrasonic vibration pattern refers to begin to calculate from compressor start operation, and interval T is after 1 time, starts ultrasonicly, moves T2 continuously and stops ultrasonic after the time; Wait for T1 again after the time, start ultrasonicly, move T2 continuously ... So circulation.In the actual motion, the scope of T1 is: 1-8 minute; The scope of T2 is: 10 seconds-1 minute; And T1 >=2T2; Can select: T1=4 minute; T2=30-60 second;
Shown in Fig. 1 b, intermittently the ultrasonic vibration of impact type refers to begin to calculate from the compressor start operation, and interval T begins to get into a partial circulating working time section T2 after 1 time: after starting the ultrasonic work T2 ' time, stop the ultrasonic T1 ' time; And then let the ultrasonic work T2 ' time ... ... when so the partial circulating temporal summation of work equals T2, stop ultrasonicly, get into the next round circulation.In the actual motion, can be provided with the scope of T1: 2-8 minute; The scope of T2 is: 10 seconds-1 minute; And T1 >=2T2; The time range of T3 is: 3-10 second; The time range of T4 is: 3-10 second; And T4 >=T3; T2 >=2T3.Can select for use: T1=4 minute; T2=1 minute; T3=5 second; T4=5 second.Perhaps: T1=3 minute; T2=1 minute; T3=5 second; T4=5 second.
The research and development explanation:
Evaporator fin is at the frosting initial stage, and the hoar crystal body presents the cross growth pattern, shows as single-ended cantilever beam result perpendicular to the hoar crystal body on fin plane, and its stress concentration point is at hoar crystal body root area.The present invention has obtained conclusion through finite element analysis: the characteristic frequency of small hoar crystal body is in the high frequency ultrasound scope, and under the certain situation of bottom surface radii size, the hoar crystal body is long more, and characteristic frequency is low more; The hoar crystal body is short more, and its characteristic frequency is big more, is not easy more to resonate.Therefore, the basic ice sheet of fin surface be difficult for to be removed, and the hoar crystal body also is difficult for removing when very little.In addition, during ultrasonic system work, be distributed with the ultrasonic vibration consistent on the fin with vibration frequency; When frost under this frequency resonance took place, the vibration displacement of hoar crystal body amplified, and ultrasonic wave produces certain interface shearing power between fin, basic ice sheet, the formed interface of hoar crystal body; When this shearing force during, fracture in promptly immediately in 3 seconds of short time, and under the gravity effect, come off greater than the adhesion of frost at fin; And when the hoar crystal body was big, the shearing force of formation was big more, and remaining hoar crystal body receives the high-cycle fatigue effect; Present the phenomenon that comes off gradually while growing; But freeze because frost growth later stage hoar crystal body intersects each other even the surface takes place, make adhesion increase, be difficult for removing.Therefore, the present invention begins ultrasonic vibration to get involved at the frosting initial stage, and the heat exchange efficiency of employing service intermittent mode to guarantee suppressing frosting effect, the heating of minimizing transducer, minimizing energy consumption and to strengthen evaporimeter.For the intervention mechanism of studying ultrasonic vibration and the effect of working mechanism, to have carried out a large amount of ultrasound wave defrostings and tested, result of the test has repeatability, shows that step ultrasonic vibration can effectively suppress evaporimeter frosting, and has tangible energy-saving significance.
Claims (6)
1. based on the air source heat pump ultrasound wave of batch (-type) loading work resonance Defrost method; It is characterized in that; On evaporimeter, install ultrasonic transducer additional; It is in the resonance duty adjustment ultrasonic transducer, and resonant frequency is measured through electric impedance analyzer or swept frequency excitation mode, carries out ultrasonic defrosting by the ultrasonic-frequency power supply drive ultrasonic transducer according to the batch (-type) load mode.
2. Defrost method according to claim 1; It is characterized in that; Described ultrasonic transducer comprises the ultrasonic transducer of piezoelectric patches, sandwich PZT (piezoelectric transducer) and magnetostriction type; The type of ultrasonic vibration comprises employing extensional vibration and radial vibration mode, and it is 15kHz-200kHz that the extensional vibration frequency is selected scope for use, and it is 20kHz-4MHz that the radial vibration frequency is selected scope for use.
3. Defrost method according to claim 1 is characterized in that described ultrasonic-frequency power supply has the automatic frequency tracking function, with the ultrasonic resonance of better assurance.
4. Defrost method according to claim 1 is characterized in that, described batch (-type) load mode is the service intermittent mechanism based on time control; Adopt intermittent continuous or impact type intermittently; After the certain time interval T 1 of intermittent continuous finger interval, continuous shaking time T 2, promptly time resting period is T1; Working time is T2, and T1 >=T2; Intermittently impact type refers to behind the certain hour at interval the pattern according to the discontinuous method work in the short time, in the short time period of correspondence during T2 work, and intermittent time definition of T 1 ', the working time is set at T2 ', and T1 ' >=T2 '.
5. Defrost method according to claim 1; It is characterized in that described service intermittent mechanism based on time control is the self-sow rule according to the hoar crystal body, approaching or identical time zone applies ultrasonic vibration to the intrinsic frequency of selecting hoar crystal body self with ultrasonic frequency vibratory; Utilize resonance effects to realize that the early stage hoar crystal body that forms of evaporator surface, frost branch and frost layer fracture and come off; Realizing the frostless or few frost of evaporator surface, is evaporimeter ambient air temperature＞-5 ℃ under the fireballing operating mode of frosting, under the condition of relative air humidity＞50%; The free convection wind speed is less than 2m/s; The evaporator surface temperature from original ambient temperature be reduced to stable before, the ratio of intermittent time T1 and working time T2 can be made as: 1≤T1/T2≤8, and T2＜1 minute; In frosting speed is evaporimeter ambient air temperature＜-5 ℃ slowly; Under relative air humidity＞30%, the operating mode of forced convertion wind speed greater than 2m/s; After the evaporator surface temperature was relatively stable, intermittent time T1 and working time T2 ratio were made as: 1≤T1/T2≤20, and T2＜1 minute.
6. Defrost method according to claim 1 is characterized in that, described intermittence, impact type was followed under above intermittent time T1 and the working time T2 setting principle, need guarantee that the each attack time T2 ' in the working time section should be no more than for 10 seconds.
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| CN104075525A (en) * | 2014-06-28 | 2014-10-01 | 祖新华 | Energy-saving frostless refrigerator |
| CN104132404A (en) * | 2014-07-31 | 2014-11-05 | 青岛海尔空调器有限总公司 | Air-conditioner defrosting method |
| CN106766580A (en) * | 2016-12-30 | 2017-05-31 | 广州芯康医疗科技有限公司 | Defroster, ultralow temperature storage box and its Defrost method |
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| WO2022263701A1 (en) | 2021-06-18 | 2022-12-22 | Consejo Superior De Investigaciones Científicas (Csic) | Device for removing and preventing the formation of ice on surfaces |
| ES2931375A1 (en) * | 2021-06-18 | 2022-12-28 | Consejo Superior Investigacion | DEVICE FOR ELIMINATION AND PREVENTION OF FORMATION OF ICE ON SURFACES (Machine-translation by Google Translate, not legally binding) |
| CN115682543A (en) * | 2021-07-29 | 2023-02-03 | 青岛海尔电冰箱有限公司 | Refrigerator and control method of ultrasonic auxiliary processing device thereof |
| CN115289742A (en) * | 2022-07-13 | 2022-11-04 | 珠海格力电器股份有限公司 | Evaporator defrosting control method and device and refrigeration equipment |
| CN115289742B (en) * | 2022-07-13 | 2023-11-14 | 珠海格力电器股份有限公司 | Evaporator defrosting control method, evaporator defrosting control device and refrigeration equipment |
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