CN102095295A - Defrosting detector and defrosting control method based on frost layer thickness - Google Patents
Defrosting detector and defrosting control method based on frost layer thickness Download PDFInfo
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- CN102095295A CN102095295A CN 201110044748 CN201110044748A CN102095295A CN 102095295 A CN102095295 A CN 102095295A CN 201110044748 CN201110044748 CN 201110044748 CN 201110044748 A CN201110044748 A CN 201110044748A CN 102095295 A CN102095295 A CN 102095295A
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Abstract
The invention discloses a defrosting detector and a defrosting control method based on the frost layer thickness, belonging to the field of air source heat pump control, and aiming at solving the problems of the inaccurate judgement of defrosting by adopting an indirect method for the existing air source heat pump and over high cost. According to the invention, an insulative layer is coated at the outer surface of a heating resistor, and first electrode pairs A-A' are arranged at the left and right of the heating resistor. The defrosting control method is as follows: in non-working state of the defrosting detector: disconnecting all switches; in the starting up state of the defrosting detector: starting the defrosting detector at the temperature of minus 12 DEG C- 1 DEG C the switching off, intermittently the switching on and off; in the starting state of defrosting: heating the resistor to work, conducting the first electrolde pairs A-A' by a frost melting water film, and outputting defrosting signals; in the defrosting state of the air source heat pump: conducting a second electrode pair B-B' by the frost melting at the surface of the fin; and in the defrosting suspending state of the defrosting detector: determining that the defrosting is finished when the output voltage signal is zero.
Description
Technical field
The present invention relates to a kind of defrosting detector and defrosting control method, belong to air source heat pump control field based on frost thickness.
Background technology
Existing defrosting control strategy to air source heat pump is divided into two kinds: indirect method and direct method.Existing Defrost method mostly is indirect method greatly, mainly comprises following several:
1, timing controlled method, time-temperature method.This class methods defrosting time is set at definite value, can not take into account the variation of environment temperature height and humidity, can accurately not hold the defrosting point of penetration, is easy to generate maloperation, and this method is responsive to the installation site of temperature sensor.Common medium position is installed, and the judgement that easily causes frosting to finish is inaccurate, and it is unclean to defrost.
2, revise defrosting control method certainly.Though can be according to structural parameters and running environment etc., the maximum difference Δ t to coil temperature and outdoor temperature revises in conjunction with defrosting effect.It is many that but this Defrost method relates to factor, detects the automatic control complexity, and Δ t revises the practical operation difficulty.
3, air pressure difference defrosting control method.By detecting the air pressure difference of evaporimeter both sides, need to determine whether defrosting.This method can realize defrosting as required, but when evaporator surface has foreign matter, serious dust stratification or off-premises station to use speed-changing draught fan, maloperation can occur.
4, maximum average heating load method, best defrosting time control method, maximum cycle coefficient of heat supply method.Very beautiful on such theoretical method, but during practical operation, some parameter is difficult to accurately comprehensively obtain, and practical application is had any problem.
5, fuzzy intelligence control defrosting.The key of this control method is how to obtain suitable fuzzy control
System rule and which type of standard of employing are made amendment to control law, and the control law that obtains according to universal experience has limitation and one-sidedness.There is the too big problem of workload again if formulate control law according to experiment.
6, indoor, outdoor dual sensor defrosting.Outdoor dual sensor defrosting is by detecting outdoor environment temperature and evaporator coil temperature and both differences as the defrosting basis for estimation, and this method is not considered the influence of humidity, and defrosting is judged inaccurate; Indoor dual sensor defrosting is by detecting indoor environment temperature and condenser coil temperature and both differences as the defrosting basis for estimation, this method is prone to maloperation when fluctuation appears in indoor load, and in the judgement that defrosting finishes, still adopt the time method, the judgement that causes defrosting to finish is inaccurate.
7, photoelectricity, capacitance sensor method.The frosting situation of evaporimeter can directly be detected by photoelectricity or capacitance probe, and this method principle is simple, but relates to high gain signal amplifier and expensive sensor, and feasible as experimental technique, the practical application economy is relatively poor.The sensing element of photoelectric sensor is subjected to the influence of outdoor heat exchanger severe temperature fluctuations for a long time, and performance reduces, and is exposed to outdoor light path vulnerable to pollution for a long time, and reliability reduces.
Above-mentioned indirect method is meant according to frosting and causes that the variation of systematic parameter judges the startup of defrosting and stop, heat pump is because the coupling height of each parts, it is many to influence parameter, do not having under the situation of frosting, the variation of environment or systematic parameter also might produce with the identical influence of frosting system, so indirect method is difficult to avoid the mistake defrosting.The indirect method defrosting is judged inaccurate; Theoretical beautiful but practical application difficulty; Cost is too high, causes to be difficult to promote; Some sensing element is subject to the outdoor environment influence, and long-term dependability reduces.
Direct method is meant direct measurement frost thickness and judges the startup of defrosting on this basis and stop.This method is not subjected to indoor and outdoor surroundings parameter and influence on system parameters, the accuracy height, but present method cost is than higher, volume is bigger, be not easy to install in intensive fin slit, and the sensing element of sensor is subject to the influence of outdoor temperature fluctuation, long-term dependability is low.Therefore develop a kind of simple in structurely, volume is little, and is with low cost, is the effective way that solves defrosting control to the method for the insensitive direct measurement frost thickness of outdoor environment.
Summary of the invention
The present invention seeks to existing the defrosting that indirect method exists is adopted in the defrosting of air source heat pump judge inaccurate in order to solve; Theoretical beautiful but practical application difficulty; Cost is too high, causes to be difficult to promote; Some sensing element is subject to outdoor environment influence, a series of problems such as long-term dependability reduction; Adopt direct method exist cost than higher, volume is big, the problem that is not easy to install, and a kind of defrosting detector and defrosting control method based on frost thickness is provided.
A kind of defrosting detector of the present invention based on frost thickness, it comprises heating resistor, the insulating plastic pipe body, temperature sensor, the first electrode pair A-A ', the second electrode pair B-B ', power supply, defrosting detector starting switch, the defrosting starting switch, pause switch, resistance is finished in defrosting starting resistance and defrosting judgement, the outer surface of heating resistor scribbles insulating barrier, the first electrode pair A-A ' is separately positioned on the left and right sides end face of heating resistor, the heating resistor and the second electrode pair B-B ' are positioned at outside the side of insulating plastic pipe body, and with its mechanical connection, heating resistor is arranged on the top of this side, the second electrode pair B-B ' is arranged on the bottom of this side
Between the heating resistor and the second electrode pair B-B ' temperature sensor is set, the frost layer temperature when temperature sensor is used to obtain outside air temperature and frosting,
Power supply, defrosting detector starting switch, defrosting starting switch, pause switch, defrosting starting resistance and defrosting judge that finishing resistance is arranged in the insulating plastic pipe body,
The negative pole of power supply links to each other with an end of defrosting detector starting switch, and the other end of defrosting detector starting switch links to each other with an end of pause switch, and the other end of pause switch links to each other with an end of heating resistor, and the other end of heating resistor links to each other with the positive pole of power supply;
The other end of defrosting detector starting switch also links to each other with an end of defrosting starting resistance, and the other end of defrosting starting resistance links to each other with the electrode of the first electrode pair A-A ', and another electrode of the first electrode pair A-A ' links to each other with the positive pole of power supply;
The other end of defrosting detector starting switch also links to each other with an end of defrosting starting switch, the other end of defrosting starting switch judges that with defrosting an end of finishing resistance links to each other, defrosting judges that the other end of finishing resistance links to each other with the electrode of the second electrode pair B-B ', and another electrode of the second electrode pair B-B ' links to each other with the positive pole of power supply.
Based on the defrosting control method of above-mentioned defrosting detector based on frost thickness, this method is:
Defrosting detector off position: when the air source heat pump refrigerating operaton, the defrosting detector is not worked, and defrosting detector starting switch and defrosting starting switch, pause switch disconnect;
Defrosting detector starting state: when the detected temperature of temperature sensor is in-12 ℃～1 ℃, defrosting detector starting switch closure, pause switch is intermittent closed, and the defrosting detector starts;
The defrosting starting state of air source heat pump: during the pause switch closure state, heating resistor is in the closed-loop path, the heat that produces during heating resistor work melts the frost of the outer surface of insulating layer of heating resistor, the moisture film that forms makes two electrodes of the first electrode pair A-A ' realize being electrically connected, the defrosting starting resistance is in the closed-loop path, defrosting starting resistance two ends output voltage signal is as the defrosting signal of air source heat pump, closed defrosting starting switch, make the defroster work of air source heat pump, begin defrosting work;
The defrost state of air source heat pump: the frost of the defroster fusing fin surface of air source heat pump, near the second electrode pair B-B ' frost constantly is being molten into moisture film, and then two electrodes that make the second electrode pair B-B ' are realized being electrically connected, defrosting judges that finishing resistance is in the closed-loop path, and resistance two ends output voltage signal is finished in the defrosting judgement;
The defrosting detector stops defrost state: when defrosting judges that finishing resistance two ends output voltage signal is 0, be judged to be defrosting and finish, the defrosting starting switch is disconnected, defrosting detector output the stopping signal that defrosts, make the defroster of air source heat pump quit work, finish defrosting control.
Advantage of the present invention:
1, material is cheap, and is with low cost.
2, material is low to the outdoor environment susceptibility, and it is little to be subjected to outdoor heat exchanger to produce the influence of severe temperature fluctuations in defrost process, long-term dependability height.
3, when going up attached to probe, small amount of dust do not influence the use of this device.
4, simple in structure, volume is little, and the influence of heat exchanging device heat exchange efficiency is little, and is easy for installation on the outdoor heat exchanger surface.
5, direct detection frost thickness is not subjected to the influence of systematic parameter and ambient parameter, accurately judges and the startup of defrosting and the moment that stops to avoid the generation of mistake defrosting.
6, adopt two controls, control algolithm is simple.
Description of drawings
Fig. 1 is the structural representation of defrosting detector;
Fig. 2 is the view of the D direction of Fig. 1;
Fig. 3 is the view of the C direction of Fig. 1;
Fig. 4 is that the defrosting detector is at the schematic diagram of outdoor mounted on fin;
Fig. 5 is a defrosting detector circuit connection diagram;
Fig. 6 is the equivalent circuit diagram of Fig. 5.
The specific embodiment
The specific embodiment one: present embodiment is described below in conjunction with Fig. 1 to Fig. 6, the described a kind of defrosting detector of present embodiment based on frost thickness, it comprises heating resistor 1, insulating plastic pipe body 3, temperature sensor 4, the first electrode pair A-A ', the second electrode pair B-B ', power supply, defrosting detector starting switch K1, defrosting starting switch K2, pause switch K3, resistance R 2 is finished in defrosting starting resistance R1 and defrosting judgement, the outer surface of heating resistor 1 scribbles insulating barrier 2, the first electrode pair A-A ' is separately positioned on the left and right sides end face of heating resistor 1, the heating resistor 1 and the second electrode pair B-B ' are positioned at outside the side of insulating plastic pipe body 3, and with its mechanical connection, heating resistor 1 is arranged on the top of this side, the second electrode pair B-B ' is arranged on the bottom of this side
Between the heating resistor 1 and the second electrode pair B-B ' temperature sensor 4 is set, the frost layer temperature when temperature sensor 4 is used to obtain outside air temperature and frosting,
Power supply, defrosting detector starting switch K1, defrosting starting switch K2, pause switch K3, defrosting starting resistance R1 and defrosting judge that finishing resistance R 2 is arranged in the insulating plastic pipe body 3,
The negative pole of power supply links to each other with the end of defrosting detector starting switch K1, the other end of defrosting detector starting switch K1 links to each other with the end of pause switch K3, the other end of pause switch K3 links to each other with an end of heating resistor 1, and the other end of heating resistor 1 links to each other with the positive pole of power supply;
The other end of defrosting detector starting switch K1 also links to each other with the end of defrosting starting resistance R1, and the other end of defrosting starting resistance R1 links to each other with the electrode of the first electrode pair A-A ', and another electrode of the first electrode pair A-A ' links to each other with the positive pole of power supply;
The other end of defrosting detector starting switch K1 also links to each other with the end of defrosting starting switch K2, the other end of defrosting starting switch K2 judges that with defrosting an end of finishing resistance R 2 links to each other, defrosting judges that the other end of finishing resistance R 2 links to each other with the electrode of the second electrode pair B-B ', and another electrode of the second electrode pair B-B ' links to each other with the positive pole of power supply.
The defrosting detector is installed on the fin, and as shown in Figure 4, the thickness of white E is the distance of heating resistor 1 to second electrode pair B-B ', and F represents insulating coating among the figure, and G represents fin.When frost runs up to the position of heating resistor 1, and the detected temperature of temperature sensor 4 is when being in-12～1 ℃, and the defrosting detector just can start work, can save the energy like this, and efficient is also high.
The electrode surface area of the second electrode pair B-B ' is 10～30 times of electrode surface area of the first electrode pair A-A '.
As seen from Figure 1, big many of the surface area ratio of electrode B B ', this be because, electrode A A ' only needs the moment conducting to get final product, so volume is less, and in order to reduce heating resistor to airborne heat radiation, also need electrode A A ' do very little.Electrode B B ' needs continuous conducting to finish up to defrosting, and this requires to have between BB ' moisture film to be communicated with BB ' electrode always, in order to improve reliability, so BB ' surface area do bigger.
The electric conductivity of considering water is not fine, so the resistance of the fixed value resistance of selecting for use big (10
5More than the Ω), a benefit is so also arranged, it makes that the electric current of signal circuit is very little, has saved electric energy.
The pause switch cycle of pause switch K3 is: closed 3 minutes～5 minutes, disconnect 8 minutes again～12 minutes.
When the defrosting detector starts, the effect that pause switch K3 is intermittently closed has three: the electric energy that resistance wire consumed of 1, saving heating resistor 1,2, in the intermittent time section, the surface of insulating layer temperature is low, frost can be very smoothly in insulating barrier 2 surface condensations, 3, when not having frosting, heating resistor 1 can play the effect of dry insulating barrier 2.
For the ease of automatic control, the defrosting detector starting switch K1 described in the present embodiment, defrosting starting switch K2 and pause switch K3 select electronic switch for use.
The selection of power supply and heating resistor will consider that the heating power of (outdoor temperature is-12 ℃) output under the least favorable situation can guarantee white melting layer.
Do unnecessary action and avoid because of dewfall or rain causing maloperation for fear of this device, limit when this device is positioned at-12～1 ℃ in the temperature of temperature sensor 4 and just start.
If require the frost thickness of control very thin, temperature sensor 4 inconveniences and electrode are installed in the same side, at this moment temperature sensor 4 can be installed in other three sides.
The present invention proposes a kind of defrosting control method and device that satisfies the direct measuring chamber external heat exchanger frost thickness of above-mentioned requirements.This device is installed on the outdoor heat exchanger fin surface, and device is provided with the resistance wire that a velamen insulating barrier wraps up at fin surface certain altitude (thickness of frost layer during defrosting).When the temperature of outdoor temperature sensor was positioned at-12～1 ℃ (this temperature section has entered the frosting zone), showing may frosting or the frosting but frost layer does not reach appointed thickness, and this moment, device started, and began to detect the frost layer.Growth along with the frost layer, its thickness increases gradually, when being increased to the height of resistance wire, because the resistance wire heating power makes white melting layer form moisture film attached to surface of insulating layer, moisture film just as same lead the signal circuit conducting, making has voltage output on the signal circuit, sends the defrosting signal and begins defrosting.After the defrosting beginning, the frost layer of being close to exchanger tube wall at first melts, the moisture film that melt to form makes another signal circuit conducting and output voltage signal to controller, when the frost thawing finishes, the water of fin surface is evaporated and totally makes second signal circuit disconnect, at this moment output voltage is zero, and controller sends the instruction that stops defrosting after receiving this signal, recovers heat supply running then.
The specific embodiment two: present embodiment is based on the defrosting control method of the described defrosting detector based on frost thickness of embodiment one, and this method is:
Defrosting detector off position: when the air source heat pump refrigerating operaton, the defrosting detector is not worked, and defrosting detector starting switch K1 and defrosting starting switch K2, pause switch K3 disconnect;
Defrosting detector starting state: when the detected temperature of temperature sensor 4 is in-12 ℃～1 ℃, defrosting detector starting switch K1 closure, pause switch K3 is intermittent closed, and the defrosting detector starts;
The defrosting starting state of air source heat pump: during pause switch K3 closure state, heating resistor 1 is in the closed-loop path, the heat that produces during heating resistor 1 work melts the frost on insulating barrier 2 surfaces outside the heating resistor 1, the moisture film that forms makes two electrodes of the first electrode pair A-A ' realize being electrically connected, defrosting starting resistance R1 is in the closed-loop path, defrosting starting resistance R1 two ends output voltage signal U1 is as the defrosting signal of air source heat pump, closed defrosting starting switch K2, make the defroster work of air source heat pump, begin defrosting work;
The defrost state of air source heat pump: the frost of the defroster fusing fin surface of air source heat pump, near the second electrode pair B-B ' frost constantly is being molten into moisture film, and then two electrodes that make the second electrode pair B-B ' are realized being electrically connected, defrosting judges that finishing resistance R 2 is in the closed-loop path, and resistance R 2 two ends output voltage signal U2 are finished in the defrosting judgement;
The defrosting detector stops defrost state: when defrosting judges that finishing resistance R 2 two ends output voltage signal U2 is 0, be judged to be defrosting and finish, defrosting starting switch K2 is disconnected, defrosting detector output the stopping signal that defrosts, make the defroster of air source heat pump quit work, finish defrosting control.
Present labor is the course of work once
During refrigerating operaton, can frosting, K1, K2, K3 disconnection at this moment.
During heating operation,, show not enter the frosting district when the temperature of temperature sensor 4 during less than-12 ℃; When the temperature of temperature sensor 4 during greater than 1 ℃, show that the thickness that does not have frosting or frost layer not to reach appointment does not need defrosting, the detector starting switch K1 that defrosts this moment, defrosting starting switch K2, pause switch K3 disconnect; When the temperature of temperature sensor 4 was positioned at-12～1 ℃ (this temperature section has entered the frosting zone), showing may frosting or the frosting but frost layer does not reach appointed thickness.This moment the detector starting switch K1 closure that defrosts, device enters duty.Initial time, defrosting starting switch K2 disconnects, pause switch K3 intermittently closed (as closed five minutes, disconnecting ten minutes).Initial time, U1=0, U2=0; If frosting, when white layer growth during to AA ' position, the resistance wire that runs into heating melts, and defrost water forms moisture film on the surface of heating resistor insulating barrier, and moisture film is equivalent to lead makes AA ' conducting, and U1 output voltage, this voltage can be used as the signal that defrosting starts.After the defrosting beginning, defrosting starting switch K2 closure, the frost that BB ' locates begins to melt, the moisture film that forms makes BB ' conducting, and output voltage U 2 is when white Ex-all, the moisture film that BB ' locates is evaporated totally, make BB ' disconnect, U2=0, (U2=0 → U2＞0 → U2=0) can be used as the signal that finishes defrosting and recover heat supply in variation during this period of time according to U2.Defrosting finish recover heat supply after, defrosting starting switch K2 disconnects, pause switch K3 is intermittently closed, detector returns to the original state of work.
Claims (4)
1. defrosting detector based on frost thickness, it is characterized in that, it comprises heating resistor (1), insulating plastic pipe body (3), temperature sensor (4), the first electrode pair A-A ', the second electrode pair B-B ', power supply, defrosting detector starting switch (K1), defrosting starting switch (K2), pause switch (K3), resistance (R2) is finished in defrosting starting resistance (R1) and defrosting judgement, the outer surface of heating resistor (1) scribbles insulating barrier (2), the first electrode pair A-A ' is separately positioned on the left and right sides end face of heating resistor (1), the heating resistor (1) and the second electrode pair B-B ' are positioned at outside the side of insulating plastic pipe body (3), and with its mechanical connection, heating resistor (1) is arranged on the top of this side, the second electrode pair B-B ' is arranged on the bottom of this side
Between the heating resistor (1) and the second electrode pair B-B ' temperature sensor (4) is set, the frost layer temperature when temperature sensor (4) is used to obtain outside air temperature and frosting,
Power supply, defrosting detector starting switch (K1), defrosting starting switch (K2), pause switch (K3), defrosting starting resistance (R1) and defrosting judge that finishing resistance (R2) is arranged in the insulating plastic pipe body (3),
The negative pole of power supply links to each other with an end of defrosting detector starting switch (K1), the other end of defrosting detector starting switch (K1) links to each other with an end of pause switch (K3), the other end of pause switch (K3) links to each other with an end of heating resistor (1), and the other end of heating resistor (1) links to each other with the positive pole of power supply;
The other end of defrosting detector starting switch (K1) also links to each other with an end of defrosting starting resistance (R1), the other end of defrosting starting resistance (R1) links to each other with the electrode of the first electrode pair A-A ', and another electrode of the first electrode pair A-A ' links to each other with the positive pole of power supply;
The other end of defrosting detector starting switch (K1) also links to each other with an end of defrosting starting switch (K2), the other end of defrosting starting switch (K2) judges that with defrosting an end of finishing resistance (R2) links to each other, defrosting judges that the other end of finishing resistance (R2) links to each other with the electrode of the second electrode pair B-B ', and another electrode of the second electrode pair B-B ' links to each other with the positive pole of power supply.
2. a kind of defrosting detector based on frost thickness according to claim 1 is characterized in that, the electrode surface area of the second electrode pair B-B ' is 10～30 times of electrode surface area of the first electrode pair A-A '.
3. a kind of defrosting detector based on frost thickness according to claim 1 is characterized in that, the pause switch cycle of pause switch (K3) is: closed 3 minutes～5 minutes, disconnect 8 minutes again～12 minutes.
4. based on the defrosting control method of the described defrosting detector based on frost thickness of claim 1, it is characterized in that this method is:
Defrosting detector off position: when the air source heat pump refrigerating operaton, the defrosting detector is not worked, and defrosting detector starting switch (K1) and defrosting starting switch (K2), pause switch (K3) disconnect;
Defrosting detector starting state: when the detected temperature of temperature sensor (4) is in-12 ℃～1 ℃, defrosting detector starting switch (K1) closure, pause switch (K3) is intermittent closed, and the defrosting detector starts;
The defrosting starting state of air source heat pump: during pause switch (K3) closure state, heating resistor (1) is in the closed-loop path, the heat that produces during heating resistor (1) work melts the frost on outer insulating barrier (2) surface of heating resistor (1), the moisture film that forms makes two electrodes of the first electrode pair A-A ' realize being electrically connected, defrosting starting resistance (R1) is in the closed-loop path, defrosting starting resistance (R1) two ends output voltage signal U1 is as the defrosting signal of air source heat pump, closed defrosting starting switch (K2), make the defroster work of air source heat pump, begin defrosting work;
The defrost state of air source heat pump: the frost of the defroster fusing fin surface of air source heat pump, near the second electrode pair B-B ' frost constantly is being molten into moisture film, and then two electrodes that make the second electrode pair B-B ' are realized being electrically connected, defrosting judges that finishing resistance (R2) is in the closed-loop path, and resistance (R2) two ends output voltage signal U2 is finished in the defrosting judgement;
The defrosting detector stops defrost state: when defrosting judges that finishing resistance (R2) two ends output voltage signal U2 is 0, being judged to be defrosting finishes, defrosting starting switch (K2) is disconnected, defrosting detector output the stopping signal that defrosts, make the defroster of air source heat pump quit work, finish defrosting control.
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| CN103062967A (en) * | 2013-01-28 | 2013-04-24 | 天津商业大学 | Intelligent defrosting controller |
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| CN106247708A (en) * | 2016-08-04 | 2016-12-21 | 珠海格力电器股份有限公司 | A kind of defrosting control method and device |
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| CN113639499A (en) * | 2021-08-05 | 2021-11-12 | 珠海格力电器股份有限公司 | Heater control system, defrosting control method, refrigerating system and refrigerator |
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| CN103292429A (en) * | 2012-02-28 | 2013-09-11 | Lg电子株式会社 | Air conditioner and method of controlling the same |
| CN103292429B (en) * | 2012-02-28 | 2016-05-11 | Lg电子株式会社 | Air-conditioning and control method thereof |
| US9429352B2 (en) | 2012-02-28 | 2016-08-30 | Lg Electronics Inc. | Air conditioner and method of controlling the same |
| CN103062967B (en) * | 2013-01-28 | 2015-03-11 | 天津商业大学 | Intelligent defrosting controller |
| CN103062967A (en) * | 2013-01-28 | 2013-04-24 | 天津商业大学 | Intelligent defrosting controller |
| CN105865131A (en) * | 2016-05-26 | 2016-08-17 | 中山市美尼亚电器有限公司 | Anti-condensation refrigerating cabinet and anti-condensation method of refrigerating cabinet |
| CN106247708B (en) * | 2016-08-04 | 2018-10-23 | 珠海格力电器股份有限公司 | A kind of defrosting control method and device |
| CN106247708A (en) * | 2016-08-04 | 2016-12-21 | 珠海格力电器股份有限公司 | A kind of defrosting control method and device |
| CN106841313A (en) * | 2017-02-21 | 2017-06-13 | 华景科技无锡有限公司 | A kind of water quality detection sensor structure and water quality detection method |
| CN106841313B (en) * | 2017-02-21 | 2023-11-17 | 华景科技无锡有限公司 | Water quality detection sensor structure and water quality detection method |
| CN106989494A (en) * | 2017-05-10 | 2017-07-28 | 广东美的制冷设备有限公司 | Air conditioner and its frosting detection device and method |
| CN108613460A (en) * | 2018-06-26 | 2018-10-02 | 北京工业大学 | A kind of air source heat pump control frost method for surveying white technology based on image recognition |
| CN112304004A (en) * | 2020-10-20 | 2021-02-02 | 株洲麦格米特电气有限责任公司 | Heat pump defrosting control method and device, controller and computer readable storage medium |
| CN112304004B (en) * | 2020-10-20 | 2022-05-13 | 株洲麦格米特电气有限责任公司 | Heat pump defrosting control method and device, controller and computer readable storage medium |
| CN113639499A (en) * | 2021-08-05 | 2021-11-12 | 珠海格力电器股份有限公司 | Heater control system, defrosting control method, refrigerating system and refrigerator |
| CN114234538A (en) * | 2021-12-20 | 2022-03-25 | 苏州热立方新能源有限公司 | Frost layer recognition device, using method and probe automatic defrosting system |
| CN114234538B (en) * | 2021-12-20 | 2023-03-10 | 苏州热立方新能源有限公司 | Frost layer recognition device, using method and probe automatic defrosting system |
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