CN111765665A - Automatic and accurate defrosting control method and device and heat pump water heater - Google Patents

Automatic and accurate defrosting control method and device and heat pump water heater Download PDF

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Publication number
CN111765665A
CN111765665A CN202010556285.2A CN202010556285A CN111765665A CN 111765665 A CN111765665 A CN 111765665A CN 202010556285 A CN202010556285 A CN 202010556285A CN 111765665 A CN111765665 A CN 111765665A
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Prior art keywords
defrosting
condition
unit
time
defrost
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CN202010556285.2A
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CN111765665B (en
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杨硕
袁明征
吴高灵
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/02—Water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Defrosting Systems (AREA)

Abstract

The invention discloses an automatic and accurate defrosting control method and device and a heat pump water heater. Wherein, the method comprises the following steps: after the unit is started, determining whether to execute a first defrosting operation according to the operation parameters of the unit; timing a non-defrost time after performing the first defrost operation; judging the defrosting condition when the defrosting time exceeds the preset minimum defrosting time; and performing a stable defrosting operation if the defrosting condition is met. According to the invention, the frosting state of the unit can be accurately judged, the defrosting is accurate without increasing the cost, and the use experience of a user is improved. And when leaking fluorine, the unit can not defrost, so that the problem of leaking fluorine is visually displayed to customers, fluorine is supplemented in time, and the service life of the unit is effectively prolonged.

Description

Automatic and accurate defrosting control method and device and heat pump water heater
Technical Field
The invention relates to the technical field of water heaters, in particular to an automatic and accurate defrosting control method and device and a heat pump water heater.
Background
In consideration of cost, most heat pump water heaters in the market adopt schemes such as timing defrosting and the like, and defrosting is carried out after time conditions and certain temperature conditions are met. This type of solution causes problems such as frost free defrosting, which easily leads to high pressure protection, frequent defrosting. Or, when the heat pump unit runs short of fluorine, even if the environment temperature is high (higher environment temperature), the external unit is likely to frost. And the machine set on the market can defrost, so that the customer cannot find the fluorine leakage fault in time. The long-term operation of the unit under the fluorine-deficient working condition until the protection is carried out can lead to the reduction of the service life of the compressor of the unit.
Aiming at the problem that the defrosting effect is not good due to the fact that the unit cannot accurately judge the frosting state and the unit state in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides an automatic and accurate defrosting control method and device and a heat pump water heater, and aims to solve the problem that in the prior art, a defrosting effect is poor due to the fact that a unit cannot accurately judge a frosting state and a unit state.
In order to solve the technical problem, the invention provides a defrosting control method, wherein the method comprises the following steps: after the unit is started, determining whether to execute a first defrosting operation according to the operation parameters of the unit; after the first defrosting operation is performed, the non-defrosting time tNot defrostedTiming; at said tNot defrostedJudging the defrosting condition when the defrosting time exceeds the preset minimum defrosting time; and performing a stable defrosting operation if the defrosting condition is met.
Further, the operating parameters include: accumulated running time tAccumulationAnd coil temperature TCoil pipe(ii) a Determining whether to execute a first defrosting operation according to the operation parameters of the unit, wherein the method comprises the following steps: if said t isAccumulationGreater than a predetermined first defrost time, and, TCoil pipe< preset defrost entry temperature, thenIt is determined that the first defrosting operation is performed.
Further, at said tNot defrostedJudging the defrosting condition when the preset minimum defrosting time is exceeded, comprising the following steps: at said tNot defrostedWhen the preset minimum defrosting time is exceeded, the step number B and the ambient temperature T of the electronic expansion valve are obtainedAmbient temperatureTemperature T of coilCoil pipe(ii) a Judging the B and the TAmbient temperatureThe TCoil pipeWhether the defrosting condition is met or not.
Further, the B and the T are judgedAmbient temperatureThe TCoil pipeWhether the defrosting condition is met or not comprises the following steps: if B is equal to the preset minimum step number of the electronic expansion valve, and T isAmbient temperature－TCoil pipeIf the temperature difference is greater than the preset temperature difference, judging that the defrosting condition is met; otherwise, it is determined that the defrosting condition is not met.
Further, after performing a stable defrosting operation if the defrosting condition is met, the method further includes: after exiting the stable defrost operation, let tNot defrostedResetting and timing again; then, at said tNot defrostedJudging the defrosting condition when the defrosting time exceeds the preset minimum defrosting time, and executing stable defrosting operation if the defrosting condition is met; and the operation is circulated in such a way until the heating of the unit is finished and the unit is automatically stopped.
The present invention also provides a defrost control apparatus, wherein the apparatus comprises: the first defrosting processing module is used for determining whether to execute first defrosting operation according to the operation parameters of the unit after the unit is started; a timing module for accumulating the running time t of the compressorAccumulationAnd time to non-defrost tNot defrostedTiming; a stable defrost processing module for performing the first defrost operation on the tNot defrostedJudging the defrosting condition when the defrosting time exceeds the preset minimum defrosting time; and performing a stable defrosting operation if the defrosting condition is met.
Further, the operating parameters include: accumulated running time tAccumulationAnd coil temperature TCoil pipe(ii) a The first defrosting processing module is specifically used for the tAccumulationGreater than a predetermined first defrost time, and, TCoil pipeAnd < the preset defrost entry temperature, determining to perform the first defrost operation.
Further, the stable defrost processing module includes: a condition judging unit for judging the condition at tNot defrostedWhen the preset minimum defrosting time is exceeded, the step number B and the ambient temperature T of the electronic expansion valve are obtainedAmbient temperatureTemperature T of coilCoil pipe(ii) a Judging the B and the TAmbient temperatureThe TCoil pipeWhether the defrosting condition is met or not.
Further, the condition determining unit is specifically configured to set B to a preset minimum step number of the electronic expansion valve, and T isAmbient temperature－TCoil pipeIf the temperature difference is greater than the preset temperature difference, judging that the defrosting condition is met; otherwise, it is determined that the defrosting condition is not met.
Further, the apparatus further comprises: a stabilizing cycle module for dropping t after the stable defrost operationNot defrostedResetting and timing again; then, at said tNot defrostedJudging the defrosting condition when the defrosting time exceeds the preset minimum defrosting time, and executing stable defrosting operation if the defrosting condition is met; the operation is circulated until the unit is automatically stopped after heating is finished, and the t is reset during the stopAccumulation。
The invention also provides a heat pump water heater, wherein the heat pump water heater comprises the defrosting control device.
The invention also provides a computer-readable storage medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the method as described above.
The technical scheme of the invention is applied, and the automatic defrosting control scheme for the heat pump water heater is provided, wherein the step number of the electronic expansion valve is used as a main judgment parameter, the accumulated running time of the compressor, the non-defrosting time of the compressor, the ambient temperature and the coil temperature are used as auxiliary judgment parameters, the frosting state of the unit is accurately judged, so that the defrosting time is determined, the defrosting is accurate, the cost is not increased, and the use experience of a user is improved. Meanwhile, the system has the function of fluorine deficiency, frosting and defrosting, so that the problem of fluorine deficiency is solved in time, and the unit is prevented from being in a bad operation condition and a low heating capacity state for a long time.
Drawings
FIG. 1 is a flow chart of a defrost control method according to an embodiment of the present invention;
fig. 2 is a flowchart of a defrosting control of the heat pump water heater according to an embodiment of the present invention;
FIG. 3 is a block diagram of a defrost control apparatus according to an embodiment of the present invention;
fig. 4 is another structural block diagram of the defrosting control means according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
Fig. 1 is a flowchart of a defrost control method according to an embodiment of the present invention, as shown in fig. 1, the method comprising the steps of:
step S101, after the unit is started, whether the first defrosting operation is executed or not is determined according to the operation parameters of the unit;
step S102, after the first defrosting operation is executed, the non-defrosting time t is conductedNot defrostedTiming;
step S103, at tNot defrostedJudging the defrosting condition when the defrosting time exceeds the preset minimum defrosting time; and performing a stable defrosting operation if the defrosting condition is met.
It should be noted that the present invention is applicable to a heat pump water heater with an electronic expansion valve as a throttling device and an automatic defrosting function. Based on this embodiment, can the frosting state of accurate judgement unit, accurate defrosting and not increase the cost improve user's use and experience. And when leaking fluorine, the unit can not defrost, so that the problem of leaking fluorine is visually displayed to customers, fluorine is supplemented in time, and the service life of the unit is effectively prolonged.
The above-mentioned operation mentioned in the present embodimentThe parameters include: accumulated running time tAccumulationAnd coil temperature TCoil pipe. Determining whether to execute the first defrosting operation according to the operation parameters of the unit, specifically, if tAccumulationGreater than a predetermined first defrost time, and, TCoil pipeIf < the preset defrosting entry temperature, it is determined that the first defrosting operation is performed. Based on this, by giving specific judgment conditions, the timing of the first defrosting can be made accurate.
After the first defrosting operation is performed, the non-defrosting time tNot defrostedTiming is carried out at tNot defrostedWhen the preset minimum defrosting time is exceeded, the step number B and the ambient temperature T of the electronic expansion valve are obtainedAmbient temperatureTemperature T of coilCoil pipe(ii) a Decision B, TAmbient temperature、TCoil pipeWhether the defrosting condition is met or not. Specifically, if B is equal to the preset electronic expansion valve minimum step number, and T isAmbient temperature－TCoil pipeIf the temperature difference is greater than the preset temperature difference, judging that the defrosting condition is met; otherwise, it is determined that the defrosting condition is not met. Based on this, provide specific defrosting condition, above-mentioned defrosting condition can realize lacking fluorine frosting and do not defrost, when leaking fluorine, the unit can not defrost for lack fluorine problem in time exposes, and the customer can in time mend fluorine and solve, effectively extension unit life.
In the running process of the heat pump water heater, the step number of the electronic expansion valve is controlled and adjusted in real time by the superheat degree. The step number of the electronic expansion valve is continuously reduced along with the reduction of the ambient temperature and is continuously reduced along with the increase of the water temperature. Therefore, in the non-frosted state, since the adjustment range of the electronic expansion valve is limited, there is a possibility that the number of steps of the electronic expansion valve is the minimum value even though there is no frost. Thus, the present invention adds a determination of the difference between the ambient temperature and the coil temperature after the electronic expansion valve minimum step determination. The judgment condition is used for roughly distinguishing the current normal operation state or the frosting operation state, and the judgment of whether the unit frosts is assisted.
It should be noted that the first defrosting operation and the stable defrosting operation mentioned in the present embodiment are consistent with the existing defrosting scheme, and the main improvement of the present invention is to provide a new defrosting entry condition control scheme.
In practical application, when the unit leaks fluorine and is in a fluorine-deficient state, the outer unit may frost even at a high ambient temperature. At the moment, the difference between the ambient temperature and the coil temperature is large, and a general defrosting control program can directly meet the conditions for defrosting, so that the unit can still run in a fluorine-deficient state until the fluorine deficiency is excessive and the protection is realized. However, the long-time fluorine-deficient operation has a bad influence on the reliability of the compressor, which leads to the reduction of the service life of the unit and the reduction of the hot water making capacity in the use process. However, during fluorine-deficient operation, the number of steps of the electronic expansion valve is continuously increased and is not adjusted to the minimum number of steps. Therefore, the fluorine-lacking unit using the defrosting and entering method can continuously thicken the frost layer and cannot enter the defrosting, and the failure and the shutdown are easy to happen quickly.
The invention takes the step number of the electronic expansion valve and the difference value of the environmental temperature and the coil temperature as the judgment parameters of the defrosting condition, thereby avoiding the defrosting operation when the unit leaks fluorine and is in a fluorine-lacking state. If T appearsAmbient temperature－TCoil pipeIf the temperature difference is greater than the preset temperature difference, but B exceeds the preset step number, the problem of fluorine shortage can occur at the moment, and a reminding message can be sent to a user. The user can find out the fluorine shortage problem in time, and the unit recovers normal operation after maintenance in time. The service life of the unit can be prolonged, and the heating capacity of the unit can be guaranteed. In the process of waiting for maintenance, the defrosting control program can restart the first defrosting program after the failure is stopped, defrost and recover heating, so that a user can still use the heat pump water heater to heat water temporarily.
After performing the stable defrosting operation, if the unit is not stopped, after exiting the stable defrosting operation, t isNot defrostedReset and re-clock. Then at tNot defrostedJudging the defrosting condition when the defrosting time exceeds the preset minimum defrosting time, and executing stable defrosting operation if the defrosting condition is met; and the operation is circulated in such a way until the heating of the unit is finished and the unit is automatically stopped. Based on the defrosting method, the whole set of defrosting scheme from the starting of the unit to the stopping of the unit is provided, and the defrosting scheme is divided into a first defrosting operation stage and a stable defrosting operation stageAnd (4) section. The defrosting is accurate when the cost is not increased, the use experience of a user is improved, and the service life of the unit is prolonged. The problems of frostless defrosting, frequent defrosting, fluoride-deficient defrosting and the like of the conventional heat pump water heater are solved.
Example 2
Fig. 2 is a flowchart of a defrosting control of the heat pump water heater according to an embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps:
1. when the unit is started, the timer starts to time tNot defrostedAnd tAccumulationAnd check t in real timeAccumulation. When t isAccumulationGreater than a predetermined value of tFirst defrost timeIn time, the unit starts to judge TCoil pipeWhether the temperature condition of the first defrosting coil is met, specifically, T is judgedCoil pipeIf < the preset defrost entry temperature is true. The preset defrosting inlet temperature is determined according to actual conditions, for example, the preset defrosting inlet temperature can be dew point temperature, and as the first defrosting is to ensure that the unit cannot operate in a frosted state for a long time after being started, the condition is loose and the unit is directly set to be 0 ℃ without problems. When the temperature condition of the first defrosting coil is met, the unit executes the first defrosting operation and is reset t after the first defrosting operation is quittedNot defrosted。
2. And then entering a non-first defrosting control program. Real-time inspection t of unitNot defrostedIf the defrosting time is longer than the preset minimum defrosting time (which can be understood as defrosting interval time), if the defrosting time is not longer than the preset minimum defrosting time, rechecking is carried out, and when the conditions are met, the defrosting condition is judged:
1) and (4) checking the step number B of the electronic expansion valve, wherein the minimum step number of the electronic expansion valve is usually a preset proper value, and is usually the larger value of the step number of the electronic expansion valve at a certain frost layer thickness or the minimum step number of the electronic expansion valve capable of meeting the high-pressure requirement of the system.
2) And when the real-time step number of the electronic expansion valve is the minimum step number of the electronic expansion valve, starting to check whether the difference value between the ambient temperature and the temperature of the coil is greater than the preset temperature difference. The preset temperature difference is a parameter value fixed according to the actual condition of the unit and is used for assisting in judging whether the unit is in a frosting state or a frostless state.
3) If the temperature difference condition of the unit is met, the unit is judged to be in a frosting state of normal operation at the moment, stable defrosting operation can be executed, defrosting is carried out after the condition of defrosting exit is met, and t is resetIs prepared fromAnd (6) defrosting.
3. The unit circularly executes the non-first defrosting control program until the unit is automatically stopped after heating is finished, and at the moment, the t is resetAccumulation。
Based on this embodiment, can the frosting state of accurate judgement unit, accurate defrosting and not increase the cost improve user's use and experience. And when leaking fluorine, the unit can not defrost, so that the problem of leaking fluorine is visually displayed to customers, fluorine is supplemented in time, and the service life of the unit is effectively prolonged.
Example 3
In correspondence with the defrosting control method described in fig. 1, the present embodiment provides a defrosting control apparatus, such as the block diagram of the structure of the defrosting control apparatus shown in fig. 3, the apparatus including:
the first defrosting processing module 10 is used for determining whether to execute the first defrosting operation according to the operation parameters of the unit after the unit is started;
a timing module 20 for accumulating the running time t of the compressorAccumulationAnd time to non-defrost tNot defrostedTiming;
a stable defrost processing module 30 for performing a first defrost operation at tNot defrostedJudging the defrosting condition when the defrosting time exceeds the preset minimum defrosting time; and performing a stable defrosting operation if the defrosting condition is met.
Based on this embodiment, can the frosting state of accurate judgement unit, accurate defrosting and not increase the cost improve user's use and experience. And when leaking fluorine, the unit can not defrost, so that the problem of leaking fluorine is visually displayed to customers, fluorine is supplemented in time, and the service life of the unit is effectively prolonged.
The above-mentioned operating parameters mentioned in the present embodiment include: accumulated running time tAccumulationAnd coil temperature TCoil pipe. The first defrosting processing module is specifically used for the first defrosting processing module at tAccumulationGreater than a predetermined first defrost time, and, TCoil pipeAnd < the preset defrost entry temperature, determining to perform the first defrost operation. Based on this, by giving specific judgment conditions, the timing of the first defrosting can be made accurate.
Above-mentioned stable defrosting processing module includes: a condition judging unit for judging at tNot defrostedWhen the preset minimum defrosting time is exceeded, the step number B and the ambient temperature T of the electronic expansion valve are obtainedAmbient temperatureTemperature T of coilCoil pipe(ii) a Decision B, TAmbient temperature、TCoil pipeWhether the defrosting condition is met or not. The condition determining unit is specifically configured to determine that the electronic expansion valve is in a state where B is equal to a preset minimum step number of the electronic expansion valve, and T isAmbient temperature－TCoil pipeIf the temperature difference is greater than the preset temperature difference, judging that the defrosting condition is met; otherwise, it is determined that the defrosting condition is not met.
Based on this, provide specific defrosting condition, above-mentioned defrosting condition can realize lacking fluorine frosting and do not defrost, when leaking fluorine, the unit can not defrost for lack fluorine problem in time exposes, and the customer can in time mend fluorine and solve, effectively extension unit life.
The above-mentioned device still includes: a stable cycle module for after exiting the stable defrost operation, comparing tNot defrostedResetting and timing again; then, at tNot defrostedJudging the defrosting condition when the defrosting time exceeds the preset minimum defrosting time, and executing stable defrosting operation if the defrosting condition is met; and the operation is circulated in such a way until the heating of the unit is finished and the unit is automatically stopped.
Based on the defrosting method, the whole set of defrosting scheme from the starting of the unit to the stopping of the unit is provided and comprises a first defrosting operation stage and a stable defrosting operation stage. The defrosting is accurate when the cost is not increased, the use experience of a user is improved, and the service life of the unit is prolonged. The problems of frostless defrosting, frequent defrosting, fluoride-deficient defrosting and the like of the conventional heat pump water heater are solved.
It should be noted that the first defrosting operation and the stable defrosting operation mentioned in the present embodiment are consistent with the existing defrosting scheme, and the main improvement of the present invention is to provide a new defrosting entry condition control scheme.
The embodiment also providesA heat pump water heater comprises the defrosting control device introduced above. Fig. 4 is another structural block diagram of a defrosting control apparatus according to an embodiment of the present invention, and as shown in fig. 4, the defrosting control apparatus includes: timing unit, memory cell and processing unit. The timing unit is used to record the time-related parameters described in the above embodiments, such as: t is tAccumulation、tNot defrosted. The storage unit is used for storing various operating parameters in the execution process of the above embodiment, for example: accumulated running time tAccumulationAnd coil temperature TCoil pipeAnd the like. The processing unit is used for performing a first defrosting operation and a stable defrosting operation (non-first defrosting operation).
Example 4
The embodiment of the present invention provides software for implementing the technical solutions described in the above embodiments and preferred embodiments.
Embodiments of the present invention provide a non-volatile computer storage medium, where a computer-executable instruction is stored in the computer storage medium, and the computer-executable instruction can execute a defrosting control method in any of the above method embodiments.
The storage medium stores the software, and the storage medium includes but is not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (12)

1. A defrost control method, the method comprising:
after the unit is started, determining whether to execute a first defrosting operation according to the operation parameters of the unit;
after the first defrosting operation is performed, the non-defrosting time tNot defrostedTiming;
at said tNot defrostedJudging the defrosting condition when the defrosting time exceeds the preset minimum defrosting time; and performing a stable defrosting operation if the defrosting condition is met.
2. The method of claim 1, wherein the operating parameters comprise: cumulative operating time t of compressorAccumulationAnd coil temperature TCoil pipe(ii) a Determining whether to execute a first defrosting operation according to the operation parameters of the unit, wherein the method comprises the following steps:
if it is saidtAccumulationGreater than a predetermined first defrost time, and, TCoil pipeIf < the preset defrosting entry temperature, it is determined that the first defrosting operation is performed.
3. The method of claim 1, wherein at tNot defrostedJudging the defrosting condition when the preset minimum defrosting time is exceeded, comprising the following steps:
at said tNot defrostedWhen the preset minimum defrosting time is exceeded, the step number B and the ambient temperature T of the electronic expansion valve are obtainedAmbient temperatureTemperature T of coilCoil pipe；
Judging the B and the TAmbient temperatureThe TCoil pipeWhether the defrosting condition is met or not.
4. The method of claim 3, wherein B and T are determinedAmbient temperatureThe TCoil pipeWhether the defrosting condition is met or not comprises the following steps:
if B is equal to the preset minimum step number of the electronic expansion valve, and T isAmbient temperature－TCoil pipeIf the temperature difference is greater than the preset temperature difference, judging that the defrosting condition is met;
otherwise, it is determined that the defrosting condition is not met.
5. The method of claim 1, wherein after performing a stable defrost operation if the defrost condition is met, the method further comprises:
after exiting the stable defrost operation, let tNot defrostedResetting and timing again;
then, at said tNot defrostedJudging the defrosting condition when the defrosting time exceeds the preset minimum defrosting time, and executing stable defrosting operation if the defrosting condition is met;
and the operation is circulated in such a way until the heating of the unit is finished and the unit is automatically stopped.
6. A defrost control apparatus, said apparatus comprising:
the first defrosting processing module is used for determining whether to execute first defrosting operation according to the operation parameters of the unit after the unit is started;
a timing module for accumulating the running time t of the compressorAccumulationAnd time to non-defrost tNot defrostedTiming;
a stable defrost processing module for performing the first defrost operation on the tNot defrostedJudging the defrosting condition when the defrosting time exceeds the preset minimum defrosting time; and performing a stable defrosting operation if the defrosting condition is met.
7. The apparatus of claim 6, wherein the operating parameters comprise: cumulative operating time t of compressorAccumulationAnd coil temperature TCoil pipe；
The first defrosting processing module is specifically used for the tAccumulationGreater than a predetermined first defrost time, and, TCoil pipeAnd < the preset defrost entry temperature, determining to perform the first defrost operation.
8. The apparatus of claim 6, wherein the stable defrost processing module comprises:
a condition judging unit for judging the condition at tNot defrostedWhen the preset minimum defrosting time is exceeded, the step number B and the ambient temperature T of the electronic expansion valve are obtainedAmbient temperatureTemperature T of coilCoil pipe(ii) a Judging the B and the TAmbient temperatureThe TCoil pipeWhether the defrosting condition is met or not.
9. The apparatus of claim 8,
the condition determining unit is specifically configured to determine that B is a preset minimum step number of the electronic expansion valve, and T is a preset minimum step number of the electronic expansion valveAmbient temperature－TCoil pipeIf the temperature difference is greater than the preset temperature difference, judging that the defrosting condition is met; otherwise, it is determined that the defrosting condition is not met.
10. The apparatus of claim 6, further comprising:
a stabilizing cycle module for dropping t after the stable defrost operationNot defrostedResetting and timing again; then, at said tNot defrostedJudging the defrosting condition when the defrosting time exceeds the preset minimum defrosting time, and executing stable defrosting operation if the defrosting condition is met; the operation is circulated until the unit is automatically stopped after heating is finished, and the t is reset during the stopAccumulation。
11. A heat pump water heater characterized in that it comprises the defrost control device of any one of claims 6 to 10.
12. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 1 to 5.
CN202010556285.2A 2020-06-17 2020-06-17 Automatic and accurate defrosting control method and device and heat pump water heater Active CN111765665B (en)

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WO2010076858A1 (en) * 2009-01-05 2010-07-08 三菱電機株式会社 Heat pump type water heater
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