CN111928435A - Air conditioner - Google Patents
Air conditioner Download PDFInfo
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- CN111928435A CN111928435A CN202010777929.0A CN202010777929A CN111928435A CN 111928435 A CN111928435 A CN 111928435A CN 202010777929 A CN202010777929 A CN 202010777929A CN 111928435 A CN111928435 A CN 111928435A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control 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
- F24F11/77—Control 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- 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)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Human Computer Interaction (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner, comprising: a calculation unit for calculating an indoor temperature difference Δ T between an indoor ambient temperature and an indoor set temperature; a control unit configured to: when the air conditioner starts to refrigerate, the air conditioner operates at a target superheat degree, and then the superheat degree is controlled and adjusted at intervals according to delta T and the current superheat degree; when the air conditioner starts to heat, the air conditioner operates at the target liquid pipe temperature, and then the temperature of the liquid pipe is controlled and regulated at intervals according to the delta T and the current liquid pipe temperature; when the air conditioner refrigerates and delta T is smaller than a low-temperature set value and continues for a first time period, or when the air conditioner heats and delta T is larger than a high-temperature set value and continues for a second time period, the control unit controls the indoor unit to stop. The invention is used for solving the problems that the indoor unit is frequently started and stopped after reaching the set temperature and the air outlet comfort level is low, avoiding frequent starting and stopping, reducing the energy consumption ratio, prolonging the service life of the compressor and improving the user experience.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner.
Background
The technology of the air source heat pump multi-split air conditioner is mature day by day, and the air source heat pump multi-split air conditioner is widely applied to the fields of household and business. The air source heat pump multi-split air conditioner comprises at least one indoor unit and at least one outdoor unit module connected with the indoor units through refrigerant connecting pipelines, wherein when the number of the indoor units is two or more, the indoor units are arranged in parallel, each indoor unit is provided with an indoor heat exchanger and a corresponding indoor fan, and when the number of the outdoor unit modules is two or more, the outdoor unit modules are arranged in parallel, each outdoor unit module is provided with a compressor, a four-way valve, a throttling element, an outdoor heat exchanger and an outdoor fan which are communicated through the connecting pipelines.
Most of the existing multi-split air conditioners are operated at the maximum output capacity during the cooling and heating operation, so that the optimal effect of the air conditioner is ensured.
During refrigeration, when certain external loop temperature, the valve openness of the indoor unit is controlled through the superheat degree of a fixed value, so that the air conditioner can operate by outputting with larger capacity, and during heating, the temperature of the indoor unit liquid pipe is controlled to be a fixed value, so that larger effect output is ensured, the indoor unit capacity output of a room cannot be adjusted according to the room temperature, the difference between the temperature of inlet air and outlet air is relatively larger, and the air conditioner can be started and stopped at the set temperature easily. When the air conditioner starts and stops, the power consumption of the compressor during starting and stopping is high, so that the energy efficiency is poor, the service life of the compressor is shortened, and the quality of the air conditioner is reduced.
Disclosure of Invention
The embodiment of the invention provides an air conditioner, which solves the problems that an indoor unit is frequently started and stopped after reaching a set temperature and the air outlet comfort level is low, avoids frequent starting and stopping, reduces the energy consumption ratio, prolongs the service life of a compressor and improves the user experience.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
the application relates to an air conditioner, which comprises an indoor unit and an outdoor unit connected through a refrigerant pipeline;
it is characterized in that the preparation method is characterized in that,
a calculation unit for calculating an indoor temperature difference Δ T between an indoor ambient temperature and an indoor set temperature;
a control unit configured to:
when the air conditioner starts to refrigerate, the air conditioner operates at a target superheat degree, and then the superheat degree is controlled and adjusted at intervals according to delta T and the current superheat degree;
when the air conditioner starts to heat, the air conditioner operates at the target liquid pipe temperature, and then the temperature of the liquid pipe is controlled and regulated at intervals according to the delta T and the current liquid pipe temperature;
when the air conditioner refrigerates and delta T is smaller than a low-temperature set value and continues for a first time period, or when the air conditioner heats and delta T is larger than a high-temperature set value and continues for a second time period, the control unit controls the indoor unit to stop.
In some embodiments of the present application, the control unit is configured to:
and the superheat degree or the liquid pipe temperature is adjusted by controlling and adjusting the opening degree of an electronic expansion valve on a refrigerant pipeline of the indoor unit.
In some embodiments of the present application, the control unit is configured to:
and adopting a PID control algorithm or a fuzzy control algorithm to control and adjust the opening degree of the electronic expansion valve.
In some embodiments of the present application, the control unit is configured to:
operating at a target superheat degree when the air conditioner starts to refrigerate, and then acquiring an indoor temperature difference Delta T at intervals,
when the delta T is larger than T1, reducing the current superheat degree;
when the delta T is more than or equal to T2 and less than or equal to T1, keeping the current superheat degree;
when the delta T is less than T2, increasing the current superheat degree;
when the air conditioner starts to heat, the air conditioner operates at the temperature of a target liquid pipe, and then the indoor temperature difference delta T is obtained at intervals,
when the delta T is larger than T3, reducing the current liquid tube temperature;
when T4 is more than or equal to delta T and less than or equal to T3, the current liquid tube temperature is kept;
when the delta T is less than T4, increasing the current liquid tube temperature;
wherein T1, T2, T3 and T4 are all set values.
In some embodiments of the present application, the low temperature set point is less than T2 and the high temperature set point is greater than T3.
In some embodiments of the present application, the control unit is configured to:
and when the air conditioner starts to heat or refrigerate, the indoor fan operates at a set gear, and then the gear of the indoor fan is controlled and adjusted at intervals according to the delta T and the current gear of the indoor fan.
In some embodiments of the present application, the control unit is configured to:
when the air conditioner starts to refrigerate, the indoor fan operates at the set gear, and then delta T is obtained at intervals,
when the delta T is larger than T1', increasing the current gear;
when T2 'is less than or equal to delta T and less than or equal to T1', keeping the current gear;
when the delta T is less than T2', the current gear is reduced;
when the air conditioner starts to heat, the indoor fan operates at the set gear, and then delta T is obtained at intervals,
when the delta T is larger than T3', the current gear is reduced;
when T4 'is less than or equal to delta T and less than or equal to T3', keeping the current gear;
when the delta T is less than T4', the current gear is increased;
wherein T1', T2', T3 'and T4' are all set values.
According to the air conditioner provided by the invention, when the air conditioner is used for refrigerating, the current superheat degree is changed in real time through the change of the indoor temperature difference, the superheat degree of the indoor unit is ensured to be positioned near the target superheat degree during refrigerating, the current liquid pipe temperature of the indoor unit is changed in real time through the change of the indoor temperature difference when the air conditioner is used for heating, the liquid pipe temperature of the indoor unit is ensured to be positioned near the target liquid pipe temperature during heating, the superheat degree or the liquid pipe temperature is continuously controlled, the capacity output of the indoor unit is timely and efficiently regulated, the indoor temperature difference is ensured to fluctuate in a small range, the user comfort is increased, the shutdown frequency of the indoor unit is reduced, and the energy conservation.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a functional block diagram of an embodiment of an air conditioner according to the present invention;
FIG. 2 is a flow chart of the operation of an embodiment of the air conditioner of the present invention;
fig. 3 is a flowchart of adjusting a gear of an indoor fan in an embodiment of an air conditioner according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
[ basic operation principle of air conditioner ]
A refrigeration cycle of an air conditioner includes a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of an air conditioner refers to a portion including a compressor of a refrigeration cycle and includes an outdoor heat exchanger, the indoor unit of an air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit of an air conditioner.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
[ air-conditioner ]
The application relates to an air conditioner.
The air conditioner comprises at least one indoor unit and an outdoor unit connected with the indoor units through refrigerant pipelines, and the indoor units are arranged in parallel.
Each indoor unit includes an indoor heat exchanger (i.e., an indoor heat exchanger as described above) and an indoor fan for blowing cold or hot air generated by the indoor heat exchanger toward an indoor space, respectively.
The outdoor unit comprises a compressor, a four-way valve, a throttling element, an outdoor heat exchanger and an outdoor fan.
The four-way valve switches the flow path of the refrigerant discharged from the compressor and has four terminals C, D, S and E.
When the four-way valve is powered off, the default C is connected with the default D, and the default S is connected with the default E, so that the heat exchanger of the indoor unit is used as an evaporator, and the air conditioner refrigerates.
When the four-way valve is electrified and reversed, the C is connected with the S, and the D is connected with the E, so that the heat exchanger of the indoor unit is used as a condenser, and the air conditioner heats.
In the present application, reference is mainly made to a heating operation mode and a cooling operation mode of an air conditioner.
The heating operation mode is the same as the common heating operation mode of the air conditioner.
In some embodiments, when the air conditioner is in a normal heating operation mode, the four-way valve is electrified and reversed to enable the D and the E to be communicated and the C and the S to be communicated, the compressor compresses low-temperature and low-pressure refrigerant into a high-temperature and high-pressure state, the refrigerant discharged by the compressor enters the indoor heat exchanger through the gas side stop valve and the extension pipe through the D and the E, the refrigerant enters the liquid pipe throttling device to be throttled to a low-temperature low-pressure gas-liquid two-state, then enters the outdoor heat exchanger to be evaporated and absorbed to be changed into a gas state, enters the gas-liquid separator through C and S after being throttled by the gas pipe throttling device, and finally is sucked into the compressor to be compressed, so that the heating cycle is completed.
The refrigeration running mode is the same as the common refrigeration running mode of the air conditioner.
In some embodiments, when the air conditioner is in a normal refrigeration operation mode, the four-way valve is powered off, the default states of communication between D and C and communication between E and S are set, the compressor compresses a low-temperature and low-pressure refrigerant into a high-temperature and high-pressure state, the refrigerant discharged by the compressor enters the outdoor heat exchanger after being throttled by the air pipe throttling device through D and C, the refrigerant is condensed and releases heat after being subjected to heat exchange by the outdoor heat exchanger to become a liquid refrigerant, then the refrigerant enters the indoor heat exchanger through the liquid pipe throttling device, the liquid side stop valve and the extension pipe to be evaporated and absorbed into a gas state, the refrigerant discharged by the indoor heat exchanger enters the gas-liquid separator through the extension pipe, the gas side stop valve and E and S of the four-.
In connection with fig. 1, in the present application, the calculation unit is configured to calculate an indoor temperature difference Δ T between an indoor ambient temperature TAO and an indoor set temperature TS in real time, i.e., Δ T = TAO-TS.
The indoor set temperature TS is the indoor temperature which is expected to be achieved and set by a user through a remote controller or a control panel; or the indoor set temperature is a default target indoor temperature when the air conditioner is started to operate; or, the indoor set temperature is the set temperature of the air conditioner at the last shutdown.
The indoor ambient temperature TAO at which each indoor unit is located can be obtained as follows.
The temperature detection device can be arranged in the room, and can be arranged on the indoor unit, in a remote controller or at any other position in the room. The temperature detection devices can be arranged at different indoor positions and then calculated according to the detected temperatures of the positions to obtain the final indoor environment temperature TAO, so that the detection accuracy of the indoor environment temperature TAO is improved.
The detection of the indoor ambient temperature TAO may be performed in real time and then stored in a temporary storage; of course, detection may also be triggered based on a temperature acquisition command.
In the present application, the control unit is used for the air conditioner to adjust the superheat degree of the indoor unit during cooling and the liquid pipe temperature of the indoor unit during heating, so as to maintain the indoor set temperature TS during cooling and heating.
Specifically, the control unit adjusts the degree of superheat of the indoor unit during cooling and the liquid pipe temperature of the indoor unit during heating by adjusting the opening degree of an electronic expansion valve on a refrigerant pipeline of the indoor unit.
The control unit can control and adjust the opening degree of the electronic expansion valve through mature control algorithms such as PID control, fuzzy control and the like.
[ Regulation of Power output ]
At present, the variable frequency air conditioning system mainly adopts a superheat degree method to adjust the opening degree of an electronic expansion valve so as to adjust the circulation quantity of a refrigerant in the air conditioning system, the superheat degree is mainly obtained by calculating the return air superheat degree determined by the return air temperature of a compressor and the temperature of an indoor coil and a target superheat degree, and the specific calculation mode of the superheat degree belongs to a conventional technical means and is not elaborated herein.
A capacity output adjusting process of the air conditioner in cooling/heating will be described with reference to fig. 2.
First, a capacity output adjusting process of the air conditioner at the time of cooling will be described.
S1: the process begins.
S2: whether the air conditioner is in a cooling operation mode or a heating operation mode.
The operation mode of the air conditioner is selected by a line controller or a remote controller in the room of the air conditioner.
If the cooling mode is selected, the process proceeds to S3; if the heating mode is selected, the process proceeds to S6.
S3: the air conditioner performs cooling at the target superheat SH, and after a normal operation for a certain period of time, the process proceeds to S4.
The target superheat SH is a known value related to the air conditioner operation mode and the compressor operation frequency, and in the cooling mode, the current target superheat corresponding to the compressor operation frequency, specifically, the current operation frequency of the compressor, one to one, may be obtained in a table lookup manner. Also, for the sake of calculation convenience, generally, one operating frequency range corresponds to one target degree of superheat.
For example, the compressor operation frequency of less than 20Hz corresponds to a target superheat degree, the compressor operation frequency of more than 90Hz corresponds to a target superheat degree, and each 10Hz frequency range among the frequencies between 20Hz and 90Hz corresponds to a target superheat degree.
S4: thereafter, at intervals of time T1, the indoor temperature difference Δ T between the indoor ambient temperature TAO and the indoor set temperature TS is calculated, and the process proceeds to S5.
The period of time t1 is a set value.
The calculation unit is configured to perform the above calculation, and the indoor ambient temperature TAO and the indoor set temperature TS are acquired as described above.
S5: and controlling and adjusting the superheat degree according to the indoor temperature difference delta T and the current superheat degree.
Initially, the degree of superheat is the target degree of superheat SH.
After the first time period T1, the superheat SH2 of the second time period T1 is determined according to the current indoor temperature difference DeltaT and the current superheat SH1 (namely the target superheat SH).
After the second time period T1, determining the superheat SH3 of the third time period T1 according to the current indoor temperature difference delta T and the current superheat SH2, and so on until the indoor unit is stopped.
The specific adjustment of the degree of superheat is as follows.
S51: when the delta T is larger than T1, the current degree of superheat is reduced, otherwise, the process goes to S52.
For example, T1 is taken at 1 ℃.
For example, after the first time period T1 has elapsed, Δ T > 1 ℃ is obtained, when the degree of superheat SH2 of the second time period T1 is equal to the degree of superheat SH1 of the first time period T1 (i.e., the target degree of superheat SH) minus 1 ℃.
After the second time period T1, Δ T is still obtained > 1 ℃, when the degree of superheat SH3 of the third time period T1 is equal to the degree of superheat SH2 of the second time period T1 minus 1 ℃.
At this time, the indoor ambient temperature TAO is reduced by reducing the current degree of superheat, so that the indoor ambient temperature TAO approaches the indoor set temperature TS.
S52: and when the T2 is more than or equal to the delta T and less than or equal to the T1, the current superheat degree is kept, and otherwise, the process enters S53.
For example, T2 is taken at 0 ℃.
For example, after the first time period T1 has elapsed, the obtained Δ T: delta T is more than or equal to 0 ℃ and less than or equal to 1 ℃, and the superheat SH2 of the second time period T1 is equal to the superheat SH1 of the first time period T1.
After the second time period T1, the obtained Δ T: delta T is more than or equal to 0 ℃ and less than or equal to 1 ℃, and the superheat SH3 of the third time period T1 is equal to the superheat SH2 of the second time period T1.
At this time, the current degree of superheat is maintained such that Δ T fluctuates within a small range, that is, the indoor ambient temperature TAO approaches the indoor set temperature TS.
S53: the current degree of superheat is increased.
That is, when Δ T < T2, the current degree of superheat is increased.
For example, after the first time period T1 has elapsed, the obtained Δ T: Δ T < 0 ℃ at which time the degree of superheat SH2 of the second time segment T1 is equal to the degree of superheat SH1 of the first time segment T1 plus 1 ℃.
After the second time period T1, the obtained Δ T: Δ T < 0 ℃ at which time the degree of superheat SH3 of the third time segment T1 is equal to the degree of superheat SH2 plus 1 ℃ of the second time segment T1.
At this time, the current degree of superheat is increased, and the indoor ambient temperature TAO is increased to approach the indoor set temperature TS.
Under the refrigeration mode of operation as above, according to indoor difference in temperature delta T and current superheat degree, continuous control superheat degree size, in time control the ability output of indoor set high-efficiently, make the ability output more accurate, the temperature fluctuation range is little, reduce the business turn over wind difference in temperature, can stabilize indoor ambient temperature near indoor settlement temperature, promote user's travelling comfort, and indoor set ability output control is more accurate, reduce indoor set load output, and then also can arouse the reduction of off-premises station press frequency, play certain energy-conserving effect.
The shutdown conditions of the indoor unit during refrigeration are as follows: the indoor temperature difference DeltaT is smaller than the low-temperature set value for a first time period.
In the present application, the first time period is greater than a period of time T1 and the low temperature set point should be less than T2, for example, taking the low temperature set point to be-1 ℃ and the first time period to be 5 minutes.
When the temperature delta T is less than-1 ℃ for 5 minutes, the control unit controls the indoor unit to stop. Otherwise, the control unit continues to calculate Δ T at intervals of T1, and performs superheat adjustment control as described above based on Δ T.
The adjustment reduces the shutdown times of the internal machine, thereby reducing unnecessary energy consumption and further saving energy.
S6, the air conditioner heats with the target liquid pipe temperature TL, and enters S7 after running normally for a period of time.
The target liquid pipe temperature TL is an empirical value determined based on the pressure of the air conditioner, is known, and may be set generally between 30 c and 48 c.
S7: thereafter, at intervals of time T1, an indoor temperature difference Δ T between the indoor ambient temperature TAO and the indoor set temperature TS is calculated.
The period of time t1 is a set value.
The calculation unit is configured to perform the above calculation, and the indoor ambient temperature TAO and the indoor set temperature TS are acquired as described above.
S8: and controlling and regulating the liquid pipe temperature according to the indoor temperature difference delta T and the current liquid pipe temperature.
Initially, the tube temperature is the target tube temperature TL.
After the first time period T1, the liquid pipe temperature TL2 is determined for the second time period T1 based on the current indoor temperature difference Δ T and the current liquid pipe temperature TL (i.e., the target liquid pipe temperature TL).
After the second time period T1, determining the liquid pipe temperature TL3 of the third time period T1 according to the current indoor temperature difference Delta T and the current liquid pipe temperature TL2, and so on until the indoor unit is shut down.
The procedure for the specific adjustment of the liquid tube temperature is as follows.
S81: when DeltaT is larger than T3, the current liquid pipe temperature is reduced, otherwise, S92 is entered.
For example, T3 is taken at 0 ℃.
For example, after the first time period T1, Δ T > 0 ℃ is obtained when the liquid tube temperature TL2 of the second time period T1 is equal to the liquid tube temperature TL1 of the first time period T1 (i.e. the target liquid tube temperature TL) minus 1 ℃.
After the second time period T1, the obtained Δ T is still Δ T > 0 ℃, when the liquid tube temperature TL3 of the third time period T1 is equal to the liquid tube temperature TL2 of the second time period T1 minus 1 ℃.
At this time, the indoor ambient temperature TAO is reduced by reducing the current temperature of the liquid pipe, so that the indoor ambient temperature TAO approaches the indoor set temperature TS.
S82: and at T4 ≦ Δ T ≦ T3, maintaining the current tube temperature, otherwise, entering S93.
For example, T4 was taken at-1 ℃.
For example, after the first time period T1 has elapsed, the obtained Δ T: -1 ℃ and. ltoreq. DELTA.T and. ltoreq.0 ℃ in which case the liquid-tube temperature TL2 of the second time period T1 is equal to the liquid-tube temperature TL1 of the first time period T1.
After the second time period T1, the obtained Δ T: -1 ℃ and. ltoreq. DeltaT 0 ℃ when the liquid-tube temperature TL3 of the third time period T1 is equal to the liquid-tube temperature TL2 of the second time period T1.
At this time, the current liquid pipe temperature is maintained, so that Δ T fluctuates within a small range, i.e., the indoor ambient temperature TAO approaches the indoor set temperature TS.
S83: increasing the current liquid tube temperature.
That is, Δ T < T4, the current tube temperature is increased.
For example, after the first time period T1 has elapsed, the obtained Δ T: Δ T < -1 ℃, when the liquid tube temperature TL2 for the second time period T1 is equal to the liquid tube temperature TL1 plus 1 ℃ for the first time period T1.
After the second time period T1, the obtained Δ T: Δ T < -1 ℃, when the liquid tube temperature TL3 for the third time period T1 is equal to the liquid tube temperature 2 plus 1 ℃ for the second time period T1.
At this time, the current degree of superheat is increased, and the indoor ambient temperature TAO is increased to approach the indoor set temperature TS.
As above under the heating operation mode, according to indoor difference in temperature delta T and current liquid pipe temperature, the liquid pipe temperature size of continuous control, in time control the ability output of indoor set high-efficiently, make the ability output more accurate, the temperature fluctuation range is little, reduce the business turn over wind difference in temperature, can stabilize indoor ambient temperature near indoor settlement temperature, promote user's travelling comfort, and indoor set ability output control is more accurate, reduce indoor set load output, and then also can arouse the reduction of off-premises station press frequency, play certain energy-conserving effect.
The shutdown condition of the indoor unit during heating is as follows: and the indoor temperature difference delta T is larger than the high-temperature set value for a second time period.
In the present application, the second time period is greater than time T1 and the high temperature set point should be greater than T3, for example, taking the second time period to be 5 minutes and the high temperature set point to be 1 ℃.
When the delta T is more than 1 ℃ and reaches 5 minutes, the control unit controls the indoor unit to stop. Otherwise, the control unit continues to calculate Δ T at intervals T1 and performs the liquid-tube temperature regulation control as described above based on Δ T.
The adjustment reduces the shutdown times of the internal machine, thereby reducing unnecessary energy consumption and further saving energy.
In order to further accurately control the capacity output of the indoor unit, in some embodiments, the gear adjustment of the indoor fan is added, the air outlet comfort is further improved through the gear continuous operation of the indoor fan and the adjustment of the temperature of the superheat degree/liquid pipe during refrigeration/heating, the capacity output change of the whole unit is ensured, and the energy-saving effect is further achieved.
Referring to fig. 3, a process of gear adjustment of the indoor fan is shown.
S1': the process begins.
S2': the indoor fan is operated at a set gear G.
S3': whether the air conditioner is in a heating operation mode or a cooling operation mode.
The operation mode of the air conditioner is selected by a line controller or a remote controller in the room of the air conditioner.
If the air conditioner is in the cooling operation mode, the indoor fan normally operates for a period of time and then the process goes to S4', and if the air conditioner is in the heating operation mode, the process goes to S6'.
S4': thereafter, at intervals of time T1, the indoor temperature difference Δ T between the indoor ambient temperature TAO and the indoor set temperature TS is calculated, and the process proceeds to S5'.
The period of time t1 is a set value.
The calculation unit is configured to perform the above calculation, and the indoor ambient temperature TAO and the indoor set temperature TS are acquired as described above.
S5': and controlling and adjusting the gear according to the indoor temperature difference delta T and the current gear.
Initially, the current gear is set gear G.
After the first time period T1, the gear G2 is determined for a second time period T1 based on the current indoor temperature difference Δ T and the current gear G1 (i.e., the target gear G).
After the second time period T1, according to the current indoor temperature difference Δ T and the current gear G2, the gear G3 of the third time period T1 is determined, and the like, until the indoor unit is stopped.
The specific adjustment of the gear is performed as follows.
S51': and when the delta T is more than T1', increasing the current gear, and otherwise, entering S52'.
For example, T1' is taken at 2 ℃.
For example, after the first time period T1 elapses, Δ T is acquired > 2 ℃, at which time gear G1 (i.e., target gear G) of the first time period T1 is shifted by one gear to gear G2 of the second time period T1.
After the second time period T1 has elapsed, Δ T is still > 2 ℃, at which point the gear G2 of the second time period T1 is shifted by one gear to the gear G of the third time period T1.
At this time, the current gear G is increased to decrease the indoor ambient temperature TAO, so that the indoor ambient temperature TAO approaches the indoor set temperature TS.
S52': at T2' ≦ Δ T ≦ T1', the current gear is held, otherwise, S53' is entered.
For example, T2' is taken at 0 ℃.
For example, after the first time period T1 has elapsed, the obtained Δ T: delta T is more than or equal to 0 ℃ and less than or equal to 2 ℃, and the gear G2 of the second time period T1 is still the gear G1 of the first time period T1.
After the second time period T1, the obtained Δ T: delta T is more than or equal to 0 ℃ and less than or equal to 2 ℃, and the gear G3 of the third time period T1 is still the gear G2 of the second time period T1.
At this time, the current degree of superheat is maintained such that Δ T fluctuates within a small range, that is, the indoor ambient temperature TAO approaches the indoor set temperature TS.
S53': and lowering the current gear.
That is, when Δ T < T2', the current shift position is lowered.
For example, after the first time period T1 has elapsed, the obtained Δ T: Δ T < 0 ℃, at which time the gear shift G1 for the first time period T1 is lowered by one gear to the gear G2 for the second time period T1.
After the second time period T1, the obtained Δ T: Δ T < 0 ℃, at which time the gear G2 for the second time period T1 is lowered by one gear to the gear G3 for the third time period T1.
At this time, the current gear is lowered, and the indoor ambient temperature TAO is raised, so that the indoor ambient temperature TAO approaches the indoor set temperature TS.
S6': thereafter, at intervals of time T1, the indoor temperature difference Δ T between the indoor ambient temperature TAO and the indoor set temperature TS is calculated, and the process proceeds to S7'.
The period of time t1 is a set value.
The calculation unit is configured to perform the above calculation, and the indoor ambient temperature TAO and the indoor set temperature TS are acquired as described above.
S7': and controlling and adjusting the gear according to the indoor temperature difference delta T and the current gear.
Initially, the current gear is set gear G.
After the first time period T1, the gear G2 is determined for the second time period T1 according to the current indoor temperature difference Δ T and the current gear G1 (i.e., the set gear G).
After the second time period T1, according to the current indoor temperature difference Δ T and the current gear G2, the gear G3 of the third time period T1 is determined, and the like, until the indoor unit is stopped.
The procedure for the specific gear adjustment is as follows.
S71': when the delta T is larger than T3', the current gear is lowered, otherwise, the operation goes to S72'.
For example, T3' is taken at 0 ℃.
For example, after the first time period T1 elapses, Δ T is acquired > 0 ℃, at which time gear G1 (i.e., set gear G) of the first time period T1 is lowered by one gear to gear G2 of the second time period T1.
After the second time period T1 has elapsed, Δ T is still > 0 ℃, at which point gear G2 of the second time period T1 is lowered by one gear to gear G3 of the third time period T1.
At this time, the current gear is lowered to lower the indoor ambient temperature TAO, so that the indoor ambient temperature TAO approaches the indoor set temperature TS.
S72': at T4' ≦ Δ T ≦ T3', the current gear is held, otherwise, S73' is entered.
For example, T4' takes a temperature of-2 ℃.
For example, after the first time period T1 has elapsed, the obtained Δ T: Δ T ≦ 0 ℃ for 2 ≦ Δ T, in which case the gear G2 for the second time period T1 is still the gear G1 for the first time period T1.
After the second time period T1, the obtained Δ T: Δ T ≦ 2 ≦ Δ T ≦ 0 ℃, when the shift G3 for the third time period T1 is still the shift G2 for the second time period T1.
At this time, the current gear is maintained such that Δ T fluctuates within a small range, that is, the indoor ambient temperature TAO approaches the indoor set temperature TS.
S73': the current gear is increased.
That is, Δ T < T4', the current gear is increased.
For example, after the first time period T1 has elapsed, the obtained Δ T: Δ T < -2 ℃, when the gear G1 for the first time period T1 is shifted one gear to the gear G2 for the second time period T1.
After the second time period T1, the obtained Δ T: Δ T < -2 ℃, when the gear G2 for the second time period T1 is shifted one gear higher to gear G3 for the third time period T1.
At this time, the current gear is increased, and the indoor ambient temperature TAO is increased to make the indoor ambient temperature TAO approach the indoor set temperature TS.
In this application, the setting of the quantity of the gear of indoor fan can be as much as possible, like this, can control indoor temperature more accurately.
During refrigeration, the superheat degree and the gear of the indoor fan are comprehensively adjusted, and during heating, the liquid pipe temperature and the gear of the indoor fan are comprehensively adjusted, so that the capacity output of the indoor unit can be more accurately controlled, and the indoor temperature fluctuation is reduced, so that the temperature difference between the air outlet temperature and the air inlet temperature is reduced, the adjusting speed of the temperature near the indoor set temperature TS is slowed down, and the comfort of a user is improved; and the shutdown frequency of the internal machine can be reduced, the energy consumption of the internal machine is reduced through more fine adjustment, so that the load output of the internal machine is reduced, the frequency of the outdoor machine press is further reduced, and the energy conservation is realized.
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 apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (7)
1. An air conditioner comprises an indoor unit and an outdoor unit connected with each other through a refrigerant pipeline;
it is characterized in that the preparation method is characterized in that,
a calculation unit for calculating an indoor temperature difference Δ T between an indoor ambient temperature and an indoor set temperature;
a control unit configured to:
when the air conditioner starts to refrigerate, the air conditioner operates at a target superheat degree, and then the superheat degree is controlled and adjusted at intervals according to delta T and the current superheat degree;
when the air conditioner starts to heat, the air conditioner operates at the target liquid pipe temperature, and then the temperature of the liquid pipe is controlled and regulated at intervals according to the delta T and the current liquid pipe temperature;
when the air conditioner refrigerates and delta T is smaller than a low-temperature set value and continues for a first time period, or when the air conditioner heats and delta T is larger than a high-temperature set value and continues for a second time period, the control unit controls the indoor unit to stop.
2. The air conditioner according to claim 1, wherein the control unit is configured to:
and the superheat degree or the liquid pipe temperature is adjusted by controlling and adjusting the opening degree of an electronic expansion valve on a refrigerant pipeline of the indoor unit.
3. The air conditioner according to claim 2, wherein the control unit is configured to:
and adopting a PID control algorithm or a fuzzy control algorithm to control and adjust the opening degree of the electronic expansion valve.
4. The air conditioner according to any one of claims 1 to 3, wherein the control unit is configured to:
operating at a target superheat degree when the air conditioner starts to refrigerate, and then acquiring an indoor temperature difference Delta T at intervals,
when the delta T is larger than T1, reducing the current superheat degree;
when the delta T is more than or equal to T2 and less than or equal to T1, keeping the current superheat degree;
when the delta T is less than T2, increasing the current superheat degree;
when the air conditioner starts to heat, the air conditioner operates at the temperature of a target liquid pipe, and then the indoor temperature difference delta T is obtained at intervals,
when the delta T is larger than T3, reducing the current liquid tube temperature;
when T4 is more than or equal to delta T and less than or equal to T3, the current liquid tube temperature is kept;
when the delta T is less than T4, increasing the current liquid tube temperature;
wherein T1, T2, T3 and T4 are all set values.
5. The air conditioner as claimed in claim 4, wherein the low temperature set point is less than T2 and the high temperature set point is greater than T3.
6. The air conditioner according to claim 1, wherein the control unit is configured to:
and when the air conditioner starts to heat or refrigerate, the indoor fan operates at a set gear, and then the gear of the indoor fan is controlled and adjusted at intervals according to the delta T and the current gear of the indoor fan.
7. The air conditioner according to claim 6, wherein the control unit is configured to:
when the air conditioner starts to refrigerate, the indoor fan operates at the set gear, and then delta T is obtained at intervals,
when the delta T is larger than T1', increasing the current gear;
when T2 'is less than or equal to delta T and less than or equal to T1', keeping the current gear;
when the delta T is less than T2', the current gear is reduced;
when the air conditioner starts to heat, the indoor fan operates at the set gear, and then delta T is obtained at intervals,
when the delta T is larger than T3', the current gear is reduced;
when T4 'is less than or equal to delta T and less than or equal to T3', keeping the current gear;
when the delta T is less than T4', the current gear is increased;
wherein T1', T2', T3 'and T4' are all set values.
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| CN112628984A (en) * | 2020-12-15 | 2021-04-09 | 宁波奥克斯电气股份有限公司 | Control method and device for electronic expansion valve of air conditioner internal unit and air conditioner |
| CN114183887A (en) * | 2021-12-09 | 2022-03-15 | 苏州莱特茵智能科技有限公司 | Air conditioner energy-saving control system and control method based on multipoint temperature measurement and human body detection |
| CN114198867A (en) * | 2021-12-13 | 2022-03-18 | 珠海格力电器股份有限公司 | Control method of air conditioner and air conditioner |
| CN114216219A (en) * | 2021-12-13 | 2022-03-22 | 珠海格力电器股份有限公司 | Control method of air conditioner and air conditioner |
| CN115264921A (en) * | 2021-07-13 | 2022-11-01 | 宁波奥克斯电气股份有限公司 | Air conditioner energy-saving control method and device and air conditioner |
| WO2023000700A1 (en) * | 2021-07-20 | 2023-01-26 | 广东美的制冷设备有限公司 | Control method for multi-split air conditioner, and multi-split air conditioner and storage medium |
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Application publication date: 20201113 |