CN110195921B - Defrosting control method and device capable of continuously heating, air conditioning unit and equipment - Google Patents

Defrosting control method and device capable of continuously heating, air conditioning unit and equipment Download PDF

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Publication number
CN110195921B
CN110195921B CN201910492327.8A CN201910492327A CN110195921B CN 110195921 B CN110195921 B CN 110195921B CN 201910492327 A CN201910492327 A CN 201910492327A CN 110195921 B CN110195921 B CN 110195921B
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Prior art keywords
defrosting
systems
preset
controlling
mode
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CN110195921A (en
Inventor
唐育辉
王传华
石伟
田锦坤
罗来平
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41Defrosting; Preventing freezing
    • F24F11/42Defrosting; Preventing freezing of outdoor units
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/50Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61Control or safety arrangements characterised by user interfaces or communication using timers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/65Electronic processing for selecting an operating mode
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a defrosting control method and device capable of continuously heating, an air conditioning unit and equipment. Wherein, the method comprises the following steps: determining a system meeting defrosting conditions in the multi-system direct-expansion air conditioning unit; selecting a target system from the systems meeting the defrosting condition according to a preset condition; and controlling the target system to enter a defrosting mode, controlling other systems except the target system in the multi-system direct expansion type air conditioning unit to continuously operate a heating mode, and controlling an indoor fan to keep operating. According to the invention, the sub-system defrosting is adopted, the target system in the air conditioning unit is determined according to the defrosting condition and the preset condition, the target system is controlled to enter the defrosting, the other systems still keep heating, and the indoor fan keeps running, so that the continuous heating can be realized on the basis of not increasing the cost, the problem that the unit needs to stop heating during defrosting is solved, the fluctuation influence of defrosting on the indoor temperature is reduced, and the user comfort is improved.

Description

Defrosting control method and device capable of continuously heating, air conditioning unit and equipment
Technical Field
The invention relates to the technical field of air conditioner control, in particular to a defrosting control method and device capable of continuously heating, a multi-system direct expansion type air conditioning unit and equipment.
Background
When the air conditioning unit is in a heating mode under a low-temperature condition, the surface of the outdoor heat exchanger is easy to frost due to low outdoor temperature and high humidity, and the heat exchange effect of the system can be reduced if the outdoor heat exchanger cannot defrost in time.
For an air-cooled direct-expansion type cold and hot air conditioning unit, when the unit enters a defrosting mode, the outdoor fan and the indoor fan are closed, and defrosting is performed by means of a compressor in a conventional method. In order to solve the problem that the unit defrosting needs to stop supplying heat, an auxiliary electric heater or hot gas bypass defrosting is usually added, but devices are added, so that the cost of the air conditioning unit is increased.
For a multi-system direct expansion type air conditioning unit, when any system meets defrosting conditions, all the systems can be controlled to simultaneously enter a defrosting mode; or the system meeting the defrosting condition enters a defrosting mode, and other systems stop running. Similarly, the outdoor fan and the indoor fan can be closed, the compressor is used for doing work to defrost, and the indoor heat supply is stopped.
Aiming at the problem that the unit defrosting needs to stop heat supply in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a defrosting control method and device capable of continuously heating, a multi-system direct expansion type air conditioning unit and equipment, and aims to solve the problem that heating of the unit needs to be stopped when defrosting is carried out in the prior art.
In order to solve the technical problem, the invention provides a defrosting control method capable of continuously heating, which comprises the following steps:
determining a system meeting defrosting conditions in the multi-system direct-expansion air conditioning unit;
selecting a target system from the systems meeting the defrosting condition according to a preset condition;
and controlling the target system to enter a defrosting mode, controlling other systems except the target system in the multi-system direct expansion type air conditioning unit to continuously operate a heating mode, and controlling an indoor fan to keep operating.
Optionally, selecting a target system from the systems meeting the defrosting condition according to a preset condition, including:
judging whether the number of the systems meeting the defrosting condition is less than or equal to a first preset number or not;
if yes, selecting all systems meeting defrosting conditions as the target system;
and if not, selecting the target system from the systems meeting the defrosting condition according to the reference running time.
Optionally, selecting the target system from the systems meeting the defrosting condition according to the reference running time, including:
respectively calculating reference operation time of each system meeting defrosting conditions, wherein the reference operation time is the system operation time from the time when the system is judged to meet the defrosting conditions to the current time;
sequencing all systems meeting the defrosting condition according to the reference running time;
and selecting a first preset number of systems from the sequencing results as the target systems according to a first preset rule.
Optionally, after controlling the target system to enter a defrosting mode, controlling other systems in the multi-system direct expansion air conditioning unit except for the target system to continue operating a heating mode, and controlling an indoor fan to keep operating, the method further includes:
calculating the number of systems currently in a defrosting mode;
if the number of the systems currently in the defrosting mode is smaller than a second preset number, selecting corresponding systems from the systems currently meeting defrosting conditions and in the heating mode according to a second preset rule, and controlling the selected systems to enter the defrosting mode, wherein the total number of the systems in the defrosting mode is not more than the first preset number.
Optionally, after controlling the target system to enter a defrosting mode, controlling other systems in the multi-system direct expansion air conditioning unit except for the target system to continue operating a heating mode, and controlling an indoor fan to keep operating, the method further includes:
detecting the air supply temperature of a unit in the process of heating and defrosting;
and if the detected unit air supply temperature is less than the preset air supply temperature within the continuous preset time, controlling the opening of an electronic expansion valve of the system in the heating mode to increase the preset steps, and continuously detecting the unit air supply temperature.
Optionally, after detecting the temperature of the air supplied by the unit, the method further includes:
and if the detected air supply temperature of the unit is greater than or equal to the preset air supply temperature within the continuous preset time, controlling the electronic expansion valve of the system in the heating mode according to the opening control rule in the heating mode.
The invention also provides a defrosting control device capable of continuously heating, which comprises:
the system determination module is used for determining a system meeting the defrosting condition in the multi-system direct-expansion air conditioning unit;
the target selection module is used for selecting a target system from the systems meeting the defrosting condition according to a preset condition;
and the system control module is used for controlling the target system to enter a defrosting mode, controlling other systems except the target system in the multi-system direct expansion type air conditioning unit to continuously operate a heating mode, and controlling the indoor fan to keep operating.
Optionally, the target selecting module includes:
the judging unit is used for judging whether the number of the systems meeting the defrosting condition is less than or equal to a first preset number or not;
the first selecting unit is used for selecting all systems meeting defrosting conditions as the target system under the condition that the judging result is yes;
and the second selecting unit is used for selecting the target system from the systems meeting the defrosting condition according to the reference running time under the condition that the judgment result is negative.
Optionally, the second selecting unit is specifically configured to:
respectively calculating reference operation time of each system meeting defrosting conditions, wherein the reference operation time is the system operation time from the time when the system is judged to meet the defrosting conditions to the current time;
sequencing all systems meeting the defrosting condition according to the reference running time;
and selecting a first preset number of systems from the sequencing results as the target systems according to a first preset rule.
Optionally, the apparatus further comprises:
the number calculation module is used for calculating the number of the systems currently in the defrosting mode;
and the defrosting control module is used for selecting a corresponding system from the systems which currently meet the defrosting condition and are in the heating mode according to a second preset rule and controlling the selected system to enter the defrosting mode under the condition that the number of the systems currently in the defrosting mode is less than a second preset number, wherein the total number of the systems in the defrosting mode is not more than the first preset number.
Optionally, the apparatus further comprises:
the temperature detection module is used for detecting the air supply temperature of the unit in the process of heating and defrosting;
and the opening control module is used for controlling the opening of an electronic expansion valve of the system in the heating mode to increase the preset steps and continuously detecting the air supply temperature of the unit if the detected air supply temperature of the unit is less than the preset air supply temperature within the continuous preset time.
Optionally, the opening degree control module is further configured to: and if the detected air supply temperature of the unit is greater than or equal to the preset air supply temperature within the continuous preset time, controlling the electronic expansion valve of the system in the heating mode according to the opening control rule in the heating mode.
The invention also provides a multi-system direct expansion type air conditioning unit, which comprises: the defrosting control device capable of continuously heating provided by any embodiment of the invention.
The present invention also provides an apparatus comprising:
one or more processors;
a memory for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement a continuously heatable defrosting control method as provided in any embodiment of the present invention.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a defrosting control method that can continuously heat as provided in any of the embodiments of the present invention.
By applying the technical scheme of the invention, the sub-system defrosting is adopted, the target system in the air conditioning unit is determined according to the defrosting condition and the preset condition, the target system is controlled to enter the defrosting, the other systems still keep heating, and the indoor fan keeps running, so that the continuous heating can be realized on the basis of not increasing the cost, the problem that the heat supply of the unit needs to be stopped during defrosting is solved, the fluctuation influence of the defrosting on the indoor temperature is reduced, and the comfort of users is improved.
Drawings
Fig. 1 is a flowchart of a defrosting control method capable of continuously heating according to an embodiment of the present invention;
fig. 2 is a system schematic diagram of a multi-system direct expansion air conditioning unit according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a defrosting control method according to an embodiment of the present invention;
fig. 4 is a flowchart of a defrosting control method capable of continuously heating according to a second embodiment of the present invention;
FIG. 5 is a flowchart illustrating a defrosting control method according to a second embodiment of the present invention;
fig. 6 is a block diagram of a defrosting control device capable of continuously heating according to a third embodiment of the present invention;
fig. 7 is a schematic hardware structure diagram of an apparatus for defrosting control according to a fifth 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.
It should be understood that although the terms first, second, third, etc. may be used to describe numbers, rules, etc. in embodiments of the invention, these numbers and rules should not be limited to these terms. These terms are only used to distinguish between different numbers and different rules. For example, the first preset number may also be referred to as a second preset number, and similarly, the second preset number may also be referred to as the first preset number without departing from the scope of the embodiments of the present invention.
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 one
Fig. 1 is a flowchart of a defrosting control method capable of continuously heating according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
and S101, determining a system meeting a defrosting condition in the multi-system direct-expansion air conditioning unit.
The multi-system direct-expansion air conditioning unit comprises at least two systems, wherein each system has the same function, and each system shares an indoor fan. Fig. 2 is a schematic system diagram of a multi-system direct expansion air conditioning unit according to an embodiment of the present invention, and as shown in fig. 2, the air conditioning unit includes N systems, where the N systems share an indoor fan and use different flow paths in an indoor heat exchanger. Each system includes: the air conditioner comprises a compressor 1, a four-way reversing valve 2, an outdoor heat exchanger 3, an outdoor fan 4, a throttle valve 5, an indoor heat exchanger 6, an indoor fan 7 and a gas-liquid separator 8.
The unit heating operation circulation flow shown in fig. 2 is as follows: compressor 1 → four-way reversing valve 2 → indoor heat exchanger 6 → throttle valve 5 → outdoor heat exchanger 3 → four-way reversing valve 2 → gas-liquid separator 8 → compressor 1.
The unit defrosting operation circulation flow shown in fig. 2 is as follows: compressor 1 → four-way selector valve 2 → outdoor heat exchanger 3 → throttle valve 5 → indoor heat exchanger 6 → four-way selector valve 2 → gas-liquid separator 8 → compressor 1.
In the step, the number of the systems meeting the defrosting condition can be detected, and the time when the systems meet the defrosting condition can be recorded. There may be one or more systems that satisfy the defrosting condition.
And S102, selecting a target system from the systems meeting the defrosting condition according to a preset condition.
The preset conditions mainly refer to number limitation, so that one part of systems in the multi-system direct-expansion air conditioning unit is defrosted, the other part of systems is heated, and continuous heating of the unit is guaranteed. There may be one or more target systems.
S103, controlling the target system to enter a defrosting mode, controlling other systems except the target system in the multi-system direct expansion type air conditioning unit to continuously operate a heating mode, and controlling the indoor fan to keep operating.
If a plurality of target systems exist, the target systems can enter a defrosting mode simultaneously. The main operations of controlling the target system to enter the defrosting mode include: and controlling the four-way reversing valve to reverse, opening the opening of the electronic expansion valve to the defrosting target step number, closing the outdoor fan, continuously operating the compressor and continuously operating the indoor fan. The main operations of exiting the defrosting mode include: and starting the outdoor fan, reversing the four-way reversing valve, opening the electronic expansion valve to the heating initial opening degree, and entering a normal heating mode. In the embodiment of the invention, the defrosting is divided into the systems, and the indoor fan still keeps running in the defrosting mode, so that the sustainable heating is realized.
According to the defrosting control method, the branch system defrosting is adopted, the target system in the air conditioning unit is determined according to the defrosting condition and the preset condition, the target system is controlled to enter the defrosting mode, other systems still keep heating, the indoor fan keeps running, continuous heating can be achieved on the basis that the cost is not increased, the problem that heat supply of the existing unit needs to be stopped during defrosting is solved, the fluctuation influence of defrosting on indoor temperature is reduced, and the comfort of users is improved.
In an alternative embodiment, S102 may include: judging whether the number of the systems meeting the defrosting condition is less than or equal to a first preset number or not; if yes, selecting all systems meeting defrosting conditions as target systems; and if not, selecting a target system from the systems meeting the defrosting condition according to the reference running time.
The first preset number is the limit of the number of systems entering the defrosting mode, and corresponding first preset numbers can be set for different air conditioning units. Preferably, the maximum value of the first preset number is N/2, and N represents the total number of systems included in the multi-system direct expansion type air conditioning unit, so that at least half of the systems are in a heating mode, continuous heating is realized, and a heating effect is guaranteed. It should be noted that, instead of the first preset number, a percentage may also be used, and a common percentage, for example, 50%, may be set for different air conditioning units, and of course, the percentage may also be adjusted according to specific situations. The reference operation time refers to a system operation time period from a time when the system is judged to satisfy the defrosting condition to a current time, for example, the system a is judged to satisfy the defrosting condition at 7 points, the current time is 8 points, and during this period, the system a is always operated, so that the reference operation time of the system a is 1 hour.
In this optional embodiment, if the number of systems meeting the defrosting condition is less than or equal to the first preset number, all the systems meeting the defrosting condition are selected as target systems. And if the number of the systems meeting the defrosting condition is larger than a first preset number, selecting target systems from the systems meeting the defrosting condition according to the reference operation time, wherein the number of the selected target systems is the first preset number. That is to say, the system that has the first preset number at most in the air conditioning unit is in the mode of defrosting for the other systems can keep heating the mode, realizes the purpose that can heat in succession, reduces the undulant influence of defrosting to indoor temperature, and does not increase the cost.
Further, selecting a target system from the systems satisfying the defrosting condition according to the reference operation time, comprising: respectively calculating the reference operation time of each system meeting the defrosting condition; sequencing all systems meeting the defrosting condition according to the reference running time; and selecting a first preset number of systems from the sequencing results as target systems according to a first preset rule.
The sequence may be from small to large, or from large to small. The first preset rule may be that a first preset number of systems are sequentially selected as target systems from the maximum reference operation time in the sorting result; or sequentially selecting a first preset number of systems as target systems from the minimum reference running time in the sequencing result. Preferably, the longer the reference running time, the priority is to enter the defrosting mode.
In this embodiment, if the number of the systems meeting the defrosting condition is greater than the first preset number, the target system is selected from the reference running time, the priority of entering the defrosting mode is determined, and a defrosting mechanism of the multi-system direct-expansion air conditioning unit is reasonably arranged.
In an optional embodiment, after S103, the method may further include: calculating the number of systems currently in a defrosting mode; if the number of the systems currently in the defrosting mode is smaller than a second preset number, selecting corresponding systems from the systems currently meeting defrosting conditions and in the heating mode according to a second preset rule, and controlling the selected systems to enter the defrosting mode, wherein the total number of the systems in the defrosting mode is not more than the first preset number. And if the number of the systems currently in the defrosting mode is larger than or equal to a second preset number, controlling the systems currently meeting the defrosting condition and in the heating mode to continuously run the heating mode.
The second preset number is used for increasing the number limit of the defrosting systems, and corresponding second preset numbers can be set for different air conditioning units. The second preset number is smaller than the first preset number. Preferably, the maximum value of the second preset number may be N/2-1, where N represents the total number of systems included in the multi-system direct-expansion air conditioning unit.
The second preset rule is: if the sum of the number of the systems meeting the defrosting condition currently and the number of the systems in the defrosting mode currently is larger than a first preset number, selecting the systems with the corresponding number from the systems meeting the defrosting condition currently according to the reference running time, and entering the defrosting mode, so that the total number of the systems in the defrosting mode does not exceed the first preset number, for example, the systems with long reference running time preferentially enter the defrosting mode; and if the sum of the number of the systems meeting the defrosting conditions currently and the number of the systems in the defrosting mode currently is less than or equal to a first preset number, directly controlling the systems meeting the defrosting conditions currently to enter the defrosting mode.
In this embodiment, if defrosting is completed by the system, on the premise of the limitation of the first preset number, the systems meeting the defrosting condition can be added to enter defrosting, so that defrosting and heating of the air conditioning unit can be stably operated.
The defrosting control method capable of continuously heating according to the present invention is described below with reference to the specific flowchart of fig. 3, where the first predetermined number is N/2, and the second predetermined number is N/2-1. As shown in fig. 3, includes:
(1) the method for detecting the condition that each system in the multi-system direct-expansion air conditioning unit meets the defrosting condition includes the following specific steps: the number of the systems meeting the defrosting condition, and the starting time of each system meeting the defrosting condition.
(2) And judging whether the number N of the systems meeting the defrosting condition in the multi-system direct expansion type air conditioning unit is less than or equal to a first preset number N/2, namely judging whether N is less than or equal to N/2, wherein N represents the total number of the systems contained in the multi-system direct expansion type air conditioning unit.
(3) When detecting that the number N of the systems meeting the defrosting condition is less than or equal to half of the total number N of the systems, the systems meeting the defrosting condition enter defrosting at the same time, the four-way reversing valve is reversed, the opening of the electronic expansion valve of the system is immediately adjusted to the target defrosting step number, the outdoor fan is closed, the compressor continues to operate, the systems not meeting the defrosting condition continue to heat and operate, and meanwhile, the indoor fan also keeps operating.
And continuously detecting the condition that other systems meet the defrosting condition, if the system (such as the system A) meets the defrosting condition, calculating the number m of systems which are defrosting, if m is less than N/2-1, the system A enters defrosting, otherwise, the system A continuously performs heating operation, and enters defrosting again when m is less than N/2-1.
(4) When detecting that the number N of the systems meeting the defrosting condition is more than half of the total number N of the systems, calculating the reference running time t of each system meeting the defrosting condition, preferentially entering a defrosting mode by the system with long reference running time, controlling the number of the systems entering the defrosting mode to be not more than N/2, immediately adjusting the opening of an electronic expansion valve of the system to the target defrosting step number while reversing the four-way reversing valve of the system entering the defrosting mode, closing an outdoor fan, continuously running a compressor, continuously heating the other systems, and simultaneously keeping the indoor fan running.
And continuously calculating the number m of systems undergoing defrosting, if m is less than N/2-1, then, the subsequent systems meeting defrosting conditions and having long reference operation time preferentially enter defrosting operation, and the total number of the systems entering a defrosting mode is controlled not to exceed N/2, otherwise, heating operation is continuously performed, and defrosting is performed when m is less than N/2-1. And (3) starting the outdoor fan by the system quitting defrosting, reversing the four-way reversing valve, opening the electronic expansion valve to the heating initial opening degree, and entering a normal heating mode.
The embodiment adopts subsystem defrosting, and the number of systems for controlling the air conditioning unit to enter the defrosting is less than or equal to the number of systems for heating, so that continuous heating can be realized on the basis of not increasing the cost, the fluctuation influence of defrosting operation on the indoor temperature is reduced, and the user comfort is improved.
Example two
The present embodiment provides a specific implementation manner of controlling the heating temperature of the unit in the unit defrosting heating process based on the first embodiment. The same or corresponding terms as those of the above-described embodiments are explained, and the description of the present embodiment is omitted.
As shown in fig. 4, the method includes the steps of:
s401, determining a system meeting defrosting conditions in the multi-system direct-expansion air conditioning unit.
S402, selecting a target system from the systems meeting the defrosting condition according to a preset condition.
And S403, controlling the target system to enter a defrosting mode, controlling other systems except the target system in the multi-system direct expansion type air conditioning unit to continue to operate a heating mode, and controlling the indoor fan to keep operating.
S404, detecting the air supply temperature of the unit in the process of heating and defrosting. The air supply temperature of the unit can be detected in real time.
S405, if the detected unit air supply temperatures are all smaller than the preset air supply temperature within the continuous preset time, controlling the opening of an electronic expansion valve of the system in the heating mode to increase the preset steps, and continuously detecting the unit air supply temperatures.
The preset air supply temperature may be a target temperature set by a user. The predetermined number of steps can be determined by experiment. After the opening degree of the electronic expansion valve is increased, the air supply temperature of the unit can be gradually increased, so that the air supply temperature of the unit is continuously detected in S405, whether the air supply temperature of the unit meets the requirement or not can be timely known, and corresponding adjustment can be timely carried out.
The embodiment adopts subsystem defrosting, controls partial system among the air conditioning unit to get into defrosting, and another partial system heats, adjusts the electronic expansion valve aperture of the system that heats simultaneously and guarantees that unit supply air temperature is in presetting the within range, realizes the purpose that can heat in succession, reduces the fluctuation influence of defrosting operation to indoor temperature, improves user's travelling comfort.
After detecting the temperature of the air supply of the unit, the method can further comprise: and if the detected air supply temperature of the unit is greater than or equal to the preset air supply temperature within the continuous preset time, controlling the electronic expansion valve of the system in the heating mode according to the opening control rule in the heating mode.
In the continuous preset time, the detected unit air supply temperature is greater than or equal to the preset air supply temperature, the unit air supply temperature basically meets the requirements, the heating temperature is not affected by defrosting, and the electronic expansion valve is controlled according to the rule of the heating mode. The heating effect is ensured while defrosting.
The method for controlling defrosting by heating continuously according to the present invention is described below with reference to the specific flowchart of fig. 5, where the first predetermined number is N/2, and the second predetermined number is N/2-1.
As shown in fig. 5, the condition that each system in the multi-system direct expansion type air conditioning unit meets the defrosting condition is detected, and the unit is controlled to heat and defrost; in the unit heating and defrosting process, detecting the unit air supply temperature Ts, and opening the opening of an electronic expansion valve of a system in a heating mode by a preset step number P when detecting that the unit air supply temperature Ts is less than a preset air supply temperature To for T seconds; and when the unit air supply temperature Ts is detected To be greater than or equal To the preset air supply temperature To continuously for T seconds, the opening degree of the electronic expansion valve of the system in the heating mode is recovered To be normally controlled (namely, the control is carried out according To the rule of the heating mode). Therefore, the air supply temperature of the unit is controlled within a reasonable range, and the fluctuation of the indoor temperature is reduced.
EXAMPLE III
Based on the same inventive concept, the present embodiment provides a defrosting control device capable of continuously heating, which can be used to implement the defrosting control method provided in the foregoing embodiments, as shown in fig. 6, the device includes:
the system determination module 610 is used for determining systems meeting defrosting conditions in the multi-system direct-expansion air conditioning unit;
a target selecting module 620, configured to select a target system from systems meeting the defrosting condition according to a preset condition;
and the system control module 630 is configured to control the target system to enter a defrosting mode, control other systems in the multi-system direct expansion air conditioning unit except the target system to continue to operate a heating mode, and control the indoor fan to keep operating.
Optionally, the target selecting module 620 includes:
the judging unit is used for judging whether the number of the systems meeting the defrosting condition is less than or equal to a first preset number or not;
the first selecting unit is used for selecting all systems meeting the defrosting condition as target systems under the condition that the judging result is yes;
and the second selecting unit is used for selecting a target system from the systems meeting the defrosting condition according to the reference running time under the condition that the judgment result is negative.
Further, the second selecting unit is specifically configured to:
respectively calculating the reference running time of each system meeting the defrosting condition, wherein the reference running time is the system running time from the time when the system is judged to meet the defrosting condition to the current time;
sequencing all systems meeting the defrosting condition according to the reference running time;
and selecting a first preset number of systems from the sequencing results as target systems according to a first preset rule.
Optionally, the apparatus may further include:
the number calculation module is used for calculating the number of the systems currently in the defrosting mode;
and the defrosting control module is used for selecting a corresponding system from the systems which currently meet the defrosting condition and are in the heating mode according to a second preset rule and controlling the selected system to enter the defrosting mode under the condition that the number of the systems currently in the defrosting mode is less than a second preset number, wherein the total number of the systems in the defrosting mode is not more than the first preset number.
Optionally, the apparatus may further include:
the temperature detection module is used for detecting the air supply temperature of the unit in the process of heating and defrosting;
and the opening control module is used for controlling the opening of an electronic expansion valve of the system in the heating mode to increase the preset steps and continuously detecting the air supply temperature of the unit if the detected air supply temperature of the unit is less than the preset air supply temperature within the continuous preset time.
Furthermore, the opening control module is further configured to control the electronic expansion valve of the system in the heating mode according to an opening control rule in the heating mode if the detected unit air supply temperature is greater than or equal to the preset air supply temperature within the continuous preset time.
The defrosting control device capable of continuously heating provided by the embodiment of the invention can execute the defrosting control method capable of continuously heating provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. For the technical details not described in detail in this embodiment, reference may be made to the defrosting control method capable of continuously heating provided in any embodiment of the present invention.
Example four
This embodiment provides a but multi-system straight expansion air conditioning unit of continuous heating, includes: the defrosting control device capable of continuously heating provided by the third embodiment.
EXAMPLE five
The present embodiment provides an apparatus, comprising:
one or more processors;
a memory for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement a defrosting control method that can continuously heat as provided by any embodiment of the present invention.
Fig. 7 is a schematic diagram of a hardware structure of an apparatus for defrosting control according to a fifth embodiment of the present invention, and as shown in fig. 7, the apparatus includes:
one or more processors 710 and a memory 720, one processor 710 being illustrated in fig. 7. The apparatus may further include: an input device 730, an output device 740.
The processor 710, the memory 720, the input device 730, and the output device 740 may be connected by a bus or other means, such as the bus connection in fig. 7.
The memory 720, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the defrosting control method in the embodiments of the present invention. The processor 710 executes various functional applications and data processing by running nonvolatile software programs, instructions and modules stored in the memory 720, that is, implements the defrosting control method of the above-described method embodiment.
The memory 720 may include a storage program area and a storage data area, wherein the storage program area may store an application program required for operating the device, at least one function; the storage data area can store data in the defrosting control process, such as a first preset number, a second preset number, a first preset rule, a second preset rule, defrosting conditions, identifications and numbers of systems meeting the defrosting conditions, unit air supply temperature and the like. Further, the memory 720 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device.
The input device 730 may receive input numeric or character information and generate key signal inputs related to user settings and function control of the apparatus. The output device 740 may include a display device such as a display screen.
EXAMPLE six
The present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a defrosting control method that can continuously heat as provided in any of the embodiments 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 defrosting control method is characterized by comprising the following steps:
determining a system meeting defrosting conditions in the multi-system direct-expansion air conditioning unit;
selecting a target system from the systems meeting the defrosting condition according to a preset condition;
controlling the target system to enter a defrosting mode, controlling other systems except the target system in the multi-system direct expansion type air conditioning unit to continuously operate a heating mode, and controlling an indoor fan to keep operating;
wherein, controlling the target system to enter into a defrosting mode, controlling other systems in the multi-system direct expansion air conditioning unit except the target system to continue to operate in a heating mode, and controlling an indoor fan to keep operating, and then further comprising:
calculating the number of systems currently in a defrosting mode;
if the number of the systems currently in the defrosting mode is smaller than a second preset number, selecting corresponding systems from the systems currently meeting defrosting conditions and in the heating mode according to a second preset rule, and controlling the selected systems to enter the defrosting mode, wherein the total number of the systems in the defrosting mode is not more than the first preset number;
the first preset number is the limit of the number of systems entering the defrosting mode;
the second preset number is used for continuously increasing the number limit of the systems, in the defrosting mode, of the defrosting system;
the second preset number is smaller than the first preset number.
2. The method according to claim 1, wherein selecting a target system from the systems satisfying the defrosting condition according to a preset condition comprises:
judging whether the number of the systems meeting the defrosting condition is less than or equal to a first preset number or not;
if yes, selecting all systems meeting defrosting conditions as the target system;
and if not, selecting the target system from the systems meeting the defrosting condition according to the reference running time.
3. The method of claim 2, wherein selecting the target system from the systems that satisfy the defrosting condition according to a reference run time comprises:
respectively calculating reference operation time of each system meeting defrosting conditions, wherein the reference operation time is the system operation time from the time when the system is judged to meet the defrosting conditions to the current time;
sequencing all systems meeting the defrosting condition according to the reference running time;
and selecting a first preset number of systems from the sequencing results as the target systems according to a first preset rule.
4. The method as claimed in any one of claims 1 to 3, wherein after controlling the target system to enter a defrosting mode, controlling other systems in the multi-system direct expansion air conditioning unit except the target system to continue to operate a heating mode, and controlling an indoor fan to keep operating, the method further comprises:
detecting the air supply temperature of a unit in the process of heating and defrosting;
and if the detected unit air supply temperature is less than the preset air supply temperature within the continuous preset time, controlling the opening of an electronic expansion valve of the system in the heating mode to increase the preset steps, and continuously detecting the unit air supply temperature.
5. The method of claim 4, after detecting the block supply air temperature, further comprising:
and if the detected air supply temperature of the unit is greater than or equal to the preset air supply temperature within the continuous preset time, controlling the electronic expansion valve of the system in the heating mode according to the opening control rule in the heating mode.
6. A defrosting control apparatus characterized by comprising:
the system determination module is used for determining a system meeting the defrosting condition in the multi-system direct-expansion air conditioning unit;
the target selection module is used for selecting a target system from the systems meeting the defrosting condition according to a preset condition;
the system control module is used for controlling the target system to enter a defrosting mode, controlling other systems except the target system in the multi-system direct expansion type air conditioning unit to continuously operate a heating mode, and controlling an indoor fan to keep operating;
wherein the apparatus further comprises:
the number calculation module is used for calculating the number of the systems currently in the defrosting mode;
the defrosting control module is used for selecting a corresponding system from the systems which currently meet the defrosting condition and are in the heating mode according to a second preset rule and controlling the selected system to enter the defrosting mode under the condition that the number of the systems currently in the defrosting mode is smaller than a second preset number, wherein the total number of the systems in the defrosting mode is not more than the first preset number;
the first preset number is the limit of the number of systems entering the defrosting mode;
the second preset number is used for continuously increasing the number limit of the systems, in the defrosting mode, of the defrosting system;
the second preset number is smaller than the first preset number.
7. The apparatus of claim 6, wherein the target selection module comprises:
the judging unit is used for judging whether the number of the systems meeting the defrosting condition is less than or equal to a first preset number or not;
the first selecting unit is used for selecting all systems meeting defrosting conditions as the target system under the condition that the judging result is yes;
and the second selecting unit is used for selecting the target system from the systems meeting the defrosting condition according to the reference running time under the condition that the judgment result is negative.
8. The apparatus according to claim 7, wherein the second selecting unit is specifically configured to:
respectively calculating reference operation time of each system meeting defrosting conditions, wherein the reference operation time is the system operation time from the time when the system is judged to meet the defrosting conditions to the current time;
sequencing all systems meeting the defrosting condition according to the reference running time;
and selecting a first preset number of systems from the sequencing results as the target systems according to a first preset rule.
9. The apparatus of any one of claims 6 to 8, further comprising:
the temperature detection module is used for detecting the air supply temperature of the unit in the process of heating and defrosting;
and the opening control module is used for controlling the opening of an electronic expansion valve of the system in the heating mode to increase the preset steps and continuously detecting the air supply temperature of the unit if the detected air supply temperature of the unit is less than the preset air supply temperature within the continuous preset time.
10. An air conditioning assembly, comprising: the defrosting control apparatus of any one of claims 6 to 9.
11. An apparatus, comprising:
one or more processors;
a memory to store one or more programs that, when executed by the one or more processors, cause the one or more processors to implement the defrosting control method of any one of claims 1 to 5.
12. A computer-readable storage medium on which a computer program is stored, the program, when executed by a processor, implementing the defrosting control method according to any one of claims 1 to 5.
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