CN114543259B - Air conditioner - Google Patents
Air conditioner Download PDFInfo
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- CN114543259B CN114543259B CN202210218830.6A CN202210218830A CN114543259B CN 114543259 B CN114543259 B CN 114543259B CN 202210218830 A CN202210218830 A CN 202210218830A CN 114543259 B CN114543259 B CN 114543259B
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
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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
- F24F11/52—Indication arrangements, e.g. displays
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The application discloses an air conditioner, which comprises an outdoor unit, at least one indoor unit and a controller; the indoor unit is connected with the outdoor unit; the outdoor unit comprises a compressor and an outdoor heat exchanger; the indoor unit comprises an indoor heat exchanger; the controller is configured with a refrigerant leakage detection mode, and when the controller is started, the controller controls the indoor unit to operate in a refrigeration mode; and executing the superheat control of the indoor unit, the high-pressure control of the system and the evaporation temperature control; the controller is provided with a compressor operation setting time and is configured to judge whether the operation time of the compressor in the refrigerant leakage amount detection mode reaches the compressor operation setting time; if yes, the supercooling degree of the outdoor heat exchanger is obtained, and the refrigerant quantity of the system is calculated; the system refrigerant leakage amount is equal to the difference between the system refrigerant amounts in the two adjacent refrigerant leakage amount detection modes. The application improves the accuracy of refrigerant leakage detection, is convenient for checking the system problems and improves the maintenance efficiency.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to an air conditioner.
Background
In the running process of the air conditioning system, leakage is caused due to poor sealing of the system, so that the refrigerant quantity in the system is often abnormal due to accumulation in daily life. The refrigerant quantity in the air conditioning system is abnormal, which can affect the refrigerating and heating effects of the unit, and even the operation reliability of the unit is affected when serious. Therefore, the leakage quantity of the refrigerant can be accurately measured in the use process of the air conditioning system, great convenience can be provided for after-sales personnel to check the problem, the system maintenance and the like, and the service level can be improved.
At present, the application range of judging the refrigerant leakage quantity of the air conditioning system of the branch factories in the industry is small, and the error is relatively large.
Disclosure of Invention
The application provides an air conditioner, which obtains the system refrigerant leakage quantity by accurately calculating the difference value of the system refrigerant quantity at the moment and the last moment under the set working condition, thereby greatly improving the precision of refrigerant leakage quantity detection and the maintenance efficiency.
In some embodiments of the present application, an air conditioner includes an outdoor unit, at least one indoor unit, and a controller; the indoor unit is connected with the outdoor unit; the outdoor unit comprises a compressor and an outdoor heat exchanger; the indoor unit comprises an indoor heat exchanger; the controller is configured with a refrigerant leakage detection mode, and when the controller is started, the controller controls the indoor unit to operate in a refrigeration mode; and executing the superheat control of the indoor unit, the high-pressure control of the system and the evaporation temperature control;
the controller is provided with a compressor operation setting time and is configured to judge whether the operation time of the compressor in the refrigerant leakage amount detection mode reaches the compressor operation setting time; if yes, the supercooling degree of the outdoor heat exchanger is obtained and used for calculating the refrigerant quantity of the system;
the system refrigerant leakage amount is equal to the difference between the system refrigerant amounts in the two adjacent refrigerant leakage amount detection modes.
The superheat degree control, the high-pressure control and the evaporation temperature control of the indoor unit control the distribution state and the density of the refrigerant in the indoor unit when the system operates at a specific value, and the density of the refrigerant in the outdoor unit is also controlled at the specific value, so that the refrigerant quantity in the system is only related to the supercooling degree of the outdoor heat exchanger, the refrigerant quantity of the system at a certain moment can be accurately calculated through the supercooling degree of the system, and then the refrigerant leakage quantity is obtained through calculating the refrigerant quantity difference value between the moment and the last moment, without correcting by adopting correction parameters, the influence of uncontrollable factors such as connection combination of different indoor units and outdoor units, temperature change of different indoor and outdoor units on the refrigerant quantity leakage detection is avoided, and the refrigerant quantity leakage detection precision is greatly improved.
In some embodiments of the present application, the controller is further configured with an indoor unit inner volume and an outdoor unit inner volume; the system refrigerant amount is calculated as follows:
MC=（（RCa*SCz 2 +RCb*SCz+RCc）*Vo）/Vos；
MC is the refrigerant quantity of the system;
SCz is the subcooling of the outdoor heat exchanger;
vo is the inner volume of the outdoor unit;
vos is the online indoor unit internal volume;
RCa, RCb, RCc is a coefficient.
In some embodiments of the present application, the controller is configured to first perform an ambient temperature determination when the refrigerant leakage detection mode is selected;
the controller is configured with an outdoor ambient temperature threshold and an indoor ambient temperature threshold, and is configured to acquire an outdoor ambient temperature and an indoor ambient temperature, compare the outdoor ambient temperature with the outdoor ambient temperature threshold, and the indoor ambient temperature with the indoor ambient temperature threshold, and activate the refrigerant leakage amount detection mode when the outdoor ambient temperature is within the outdoor ambient temperature threshold range and the indoor ambient temperature is within the indoor ambient temperature threshold range.
In some embodiments of the present application, the controller is configured with a compressor discharge temperature variation threshold, an indoor unit superheat minimum threshold, an indoor unit superheat maximum threshold, and a time threshold;
the controller is configured to circularly acquire a compressor discharge temperature and an indoor unit superheat degree when the refrigerant leakage detection mode is started and the operation time of the compressor is longer than the operation setting time of the compressor, and compare the compressor discharge temperature change value with the compressor discharge temperature change threshold, the minimum value of the indoor unit superheat degree with the indoor unit superheat degree minimum value threshold, and the maximum value of the indoor unit superheat degree with the indoor unit superheat degree maximum value threshold;
and when the compressor exhaust temperature change value is smaller than the compressor exhaust temperature change threshold, and the duration that the minimum value of the indoor unit superheat degree is larger than the minimum value threshold of the indoor unit superheat degree and the maximum value of the indoor unit superheat degree is smaller than the maximum value threshold of the indoor unit superheat degree exceeds the time threshold, calculating the system refrigerant quantity.
In some embodiments of the present application, the superheat control of the indoor unit includes the following matters;
the indoor unit further comprises an indoor unit expansion valve which is connected with the controller and is arranged in front of the inlet of the indoor heat exchanger;
the controller is configured with an expansion valve opening initial value, a preset superheat degree, a first set value and a second set value, and is configured to control the indoor unit expansion valve to operate at the expansion valve opening initial value, acquire the indoor unit superheat degree and compare the indoor unit superheat degree with the preset superheat degree;
when the difference between the superheat degree of the indoor unit and the preset superheat degree is larger than the first set value, controlling the expansion valve of the indoor unit to increase the opening degree;
when the difference between the superheat degree of the indoor unit and the preset superheat degree is smaller than the second set value, controlling the expansion valve of the indoor unit to reduce the opening;
the first set value and the second set value are constants, and the first set value is larger than the second set value.
In some embodiments of the application, the system high voltage control includes the following;
the outdoor unit further comprises an outdoor fan which is connected with the controller; the controller is configured with an initial operating frequency of the outdoor fan, a preset high-pressure value, a third set value and a fourth set value, and is configured to control the outdoor fan to operate at the initial operating frequency of the outdoor fan, acquire a system high pressure and compare the system high pressure with the preset high pressure value;
when the difference between the system high pressure and the preset high pressure value is larger than the third set value, controlling the operation frequency of the outdoor fan to be increased;
when the difference between the system high pressure and the preset high pressure value is smaller than the fourth set value, controlling the operation frequency of the outdoor fan to be reduced;
the third set value and the fourth set value are constants, and the third set value is larger than the fourth set value.
In some embodiments of the application, the vaporization temperature control comprises the following;
the controller is configured with an initial value of the operation frequency of the compressor, a preset evaporation temperature, a fifth set value and a sixth set value, and is configured to control the compressor to operate at the initial value of the operation frequency of the compressor, obtain the evaporation temperature, and compare the evaporation temperature with the preset evaporation temperature;
when the difference between the evaporation temperature and the preset evaporation temperature is larger than the fifth set value, controlling the operation frequency of the compressor to be increased;
controlling the compressor operation frequency to decrease when the difference between the evaporation temperature and the preset evaporation temperature is smaller than the sixth set value;
the fifth set value and the sixth set value are constants, and the fifth set value is larger than the sixth set value.
In some embodiments of the present application, the display module is connected to the controller; the controller is configured with a plurality of codes; each code corresponds to a different range value of the system refrigerant leakage quantity;
the controller is configured to judge the code corresponding to the refrigerant leakage amount and control the display module to display the code.
In some embodiments of the application, the device further comprises a wire controller, wherein the wire controller comprises a display and a wire controller; the wire controller is configured with a refrigerant leakage detection mode;
the controller comprises an indoor controller, an outdoor controller and a wire controller; the indoor controller is respectively in communication connection with the wire controller and the outdoor controller; the code is displayed by the display controlled by the wire controller.
In some embodiments of the application, the controller comprises an indoor controller and an outdoor controller which are in communication connection; the outdoor unit comprises an outdoor electric control board which is provided with a refrigerant leakage quantity detection execution switch; the outdoor controller is arranged on the outdoor electric control board and is connected with the refrigerant leakage detection execution switch;
when the refrigerant leakage amount detection execution switch is operated, the outdoor controller controls the operation of the refrigerant leakage amount detection mode.
Drawings
Fig. 1 is a schematic system configuration diagram of a cooling and heating type embodiment of an air conditioner according to the present application;
FIG. 2 is a schematic diagram of a single cooling system of an embodiment of an air conditioning apparatus according to the present application;
FIG. 3 is a control system connection schematic of an embodiment of an air conditioning apparatus of the present application;
FIG. 4 is a control system connection schematic of an embodiment of an air conditioning apparatus of the present application;
fig. 5 is a control flow chart of an embodiment of the air conditioner of the present application;
fig. 6 is a control flow chart of an embodiment of an air conditioner of the present application;
fig. 7 is a control flow chart of an embodiment of an air conditioner of the present application;
fig. 8 is a flowchart of the indoor unit superheat control;
FIG. 9 is a system high voltage control flow diagram;
fig. 10 is a flowchart of evaporation temperature control.
Reference numerals:
1. a compressor; 2. a four-way valve; 3. an outdoor heat exchanger; 4. an outdoor fan; 5. an outdoor unit expansion valve; 7. an indoor unit expansion valve; 8. an indoor heat exchanger; 12. a display module; 13. an indoor temperature sensor; 14. an evaporation temperature sensor; 15. an outdoor temperature sensor; 16. an exhaust gas temperature sensor; 17. an exhaust pressure sensor; 18. a main liquid pipe temperature sensor; 19. an evaporator outlet temperature sensor; y, a wire controller; c1, a wire controller; c2, an indoor controller; c3, an outdoor sensor; MC, system refrigerant amount; SCz, supercooling degree; vo, outdoor unit internal volume; vos, on-line indoor unit internal volume; Δmc, system refrigerant leakage; TW, outdoor ambient temperature; TN, indoor ambient temperature; td, exhaust temperature; delta T, exhaust temperature change threshold; SH, superheat degree of indoor unit; SH0, presetting a superheat degree; SH1, a minimum threshold; SH2, maximum threshold; t, time threshold; tg, evaporator outlet temperature; EVI, expansion valve opening; EVI0, expansion valve opening initial value; a. a first set value; b. a second set value; pd, high system pressure; pdO, preset system high pressure; FO, outdoor fan operating frequency; FO0, initial value of operating frequency of outdoor fan; c. a third set value; d. a fourth set value; tl, evaporation temperature; tlO, preset evaporation temperature; tc, saturation temperature; te, main liquid pipe temperature; te_ave, average temperature of main liquid pipe; hi. Compressor operating frequency; hi0, initial value of compressor operating frequency; e. a fifth set value; f. and a sixth set value.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The application provides an air conditioner, which comprises an outdoor unit and at least one indoor unit, wherein the outdoor unit is connected with the indoor unit; the outdoor unit comprises a compressor 1, an outdoor heat exchanger 3, an outdoor unit expansion valve 5 and an outdoor fan 4; the indoor unit comprises an indoor heat exchanger 8 and an indoor unit expansion valve 7. The air conditioner performs a refrigeration cycle by using the compressor 1, the outdoor heat exchanger 3, the outdoor unit expansion valve 5, the indoor unit expansion valve 7, and the indoor heat exchanger 8. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and refrigerating an indoor space.
When the outdoor unit of the air conditioner comprises the four-way valve 2, the flow direction of the refrigerant in the air conditioner is changed by changing the communication direction of the four-way valve 2, so that the functions of the outdoor heat exchanger 3 and the indoor heat exchanger 8 are changed, and the refrigerating and heating functions of the air conditioner are realized.
The specific procedure is as follows, the indoor heat exchanger 8 and the outdoor heat exchanger 3 functioning as condensers or evaporators. When the indoor heat exchanger 8 is used as a condenser and the outdoor heat exchanger 3 is used as an evaporator, the air conditioner performs a heating mode; when the indoor heat exchanger 8 is used as an evaporator and the outdoor heat exchanger 3 is used as a condenser, the air conditioner performs a cooling mode. The indoor unit expansion valve 7 and the outdoor unit expansion valve 5 are collectively referred to as expansion valves, and are used for throttling.
The low-temperature low-pressure refrigerant enters the compressor 1, the compressor 1 compresses the refrigerant gas in a high-temperature high-pressure state, and the compressed refrigerant gas is discharged. 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 formed by condensation 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 1. The evaporator may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant.
The mode of converting the indoor heat exchanger 8 and the outdoor heat exchanger 3 into a condenser or an evaporator generally adopts the four-way valve 2, and the details of the arrangement of the conventional air conditioner are specifically referred to and will not be described herein.
The refrigeration working principle of the air conditioner is as follows: the compressor 1 works to enable the interior of the indoor heat exchanger 8 (in the indoor unit, the evaporator at the moment) to be in an ultralow pressure state, liquid refrigerant in the indoor heat exchanger 8 is rapidly evaporated to absorb heat, air blown out by the indoor fan is cooled by the coil pipe of the indoor heat exchanger 8 and then is changed into cold air to be blown into the room, the evaporated refrigerant is pressurized by the compressor 1 and then condensed into liquid state in the high-pressure environment in the outdoor heat exchanger 3 (in the outdoor unit, the condenser at the moment) to release heat, and the heat is emitted into the atmosphere through the outdoor fan 4, so that the refrigerating effect is achieved through circulation.
The heating working principle of the air conditioner is as follows: the gaseous refrigerant is pressurized by the compressor 1 to become high-temperature and high-pressure gas, and enters the indoor heat exchanger 8 (a condenser in this case), and is condensed, liquefied and released to become liquid, and meanwhile, the indoor air is heated, so that the aim of improving the indoor temperature is fulfilled. The liquid refrigerant is decompressed by the throttle device, enters the outdoor heat exchanger 3 (an evaporator at this time), evaporates and gasifies to absorb heat, becomes gas, absorbs heat of outdoor air (the outdoor air becomes colder) and becomes a gaseous refrigerant, and enters the compressor 1 again to start the next cycle.
Referring to fig. 1, 2, 3, 4, and 5, according to some embodiments of the present application, the air conditioner further includes a controller configured with a refrigerant leakage amount detection mode.
When the refrigerant leakage amount detection mode is started, the controller controls the indoor unit to operate in a refrigeration mode, performs the indoor unit superheat control, the system high-pressure control and the evaporation temperature control, and continuously operates for a specific time to keep the distribution and density of the refrigerant in the indoor unit, the distribution and density of the refrigerant in the outdoor unit and the density of the refrigerant in the piping at specific values, so that the refrigerant amount in the system is only related to the supercooling degree SCz of the outdoor heat exchanger 3.
The controller is further configured with a compressor operation setting time, and is configured to cycle the judgment of whether the operation time of the compressor 1 reaches the compressor operation setting time in the refrigerant leakage amount detection mode, and to acquire the supercooling degree SCz of the outdoor heat exchanger 3 when the operation time of the compressor 1 is not less than the compressor operation setting time, and to calculate the system refrigerant amount MC.
And then the controller calculates the leakage amount of the system refrigerant. That is, the system refrigerant leakage amount Δmc is equal to the difference between the system refrigerant amounts MC when the adjacent two refrigerant leakage amount detection modes are operated.
The air conditioning device of the embodiment controls the distribution state and density of the refrigerant in the indoor unit to be a specific value when the system is in operation and also controls the density of the refrigerant in the outdoor unit to be a specific value by controlling the superheat degree of the indoor unit, the high pressure of the system and the evaporation temperature, and the refrigerant quantity in the system is only related to the supercooling degree SCz of the outdoor heat exchanger 3; the refrigerant quantity of the system at a certain moment can be accurately judged through the system supercooling degree SCz, then the refrigerant leakage quantity is calculated according to the refrigerant quantity difference between the moment and the last moment, correction parameters are not needed to be adopted for correction, the influence of uncontrollable factors such as different indoor and outdoor machine connection combinations, different indoor and outdoor environment temperature changes and the like on the refrigerant quantity leakage detection is avoided, and the refrigerant quantity leakage detection precision is greatly improved.
The system refrigerant quantity MC in the system is respectively judged at two different time points, and the refrigerant leakage quantity in the period is determined according to the difference value of the system refrigerant quantity MC at the two time points, so that after-sales personnel can obtain the leakage quantity of the system refrigerant in the period conveniently after a short time, and further, the system problem is checked according to the leakage quantity, great convenience is provided for system maintenance and the like, and the service level is also facilitated to be improved.
It should be noted that, the density of the refrigerant in the indoor unit and the outdoor unit can be controlled at a specific value by the high pressure control and the evaporation temperature control of the system, because the pressure of the refrigerant in the system determines the density of the refrigerant, the high pressure Pd of the control system can control the density of the refrigerant in the condenser, and the low pressure of the evaporation temperature Tl, that is, the density of the refrigerant in the evaporator, can be controlled.
The inlet and outlet states of the indoor heat exchanger 8 are related to the low pressure of the system, the superheat degree SH of the indoor unit and the supercooling degree SCz of the outdoor heat exchanger 3, and the low pressure of the system and the superheat degree SH of the indoor unit are controlled to be in a set level, so that the state and average density of the refrigerant in the indoor heat exchanger are only related to the supercooling degree SCz of the outdoor heat exchanger 3.
The density of the refrigerant in the piping is basically determined, and the quality is fixed.
The inlet and outlet states of the outdoor heat exchanger 3 are related to the high pressure Pd of the system and the supercooling degree SCz of the outdoor heat exchanger 3. So when the system high pressure Pd is controlled at a specific value, the refrigerant quantity of the outdoor heat exchanger 3 is only related to the supercooling degree SCz of the outdoor heat exchanger 3; the larger the supercooling degree SCz is, the larger the proportion of the liquid refrigerant is, the average density is increased, and the refrigerant amount of the outdoor heat exchanger 3 is larger.
Therefore, the superheat degree control of the indoor unit, the high-pressure control of the system and the evaporation temperature control are carried out, so that the density of the system refrigerant is controlled to be a specific value, the system refrigerant quantity MC is only related to the supercooling degree SCz of the outdoor heat exchanger 3, the system refrigerant quantity MC is calculated only through the supercooling degree SCz of the outdoor heat exchanger 3, and the calculation precision of the system refrigerant quantity MC is improved.
Referring to fig. 1, 2, 3, 4, 5, 6 and 7, according to some embodiments of the present application, the controller is further configured with an outdoor unit internal volume Vo and each indoor unit internal volume; the system refrigerant amount MC is calculated as follows.
MC=（（RCa*SCz 2 +RCb*SCz+RCc）*Vo）/Vos；
MC is the system refrigerant quantity;
SCz is the degree of supercooling of the outdoor heat exchanger 3;
vo is the inner volume of the outdoor unit;
vos is the internal volume of the on-line indoor unit;
RCa, RCb, RCc is a coefficient.
Then Δmc=mcn-MCn-1;
ΔMC is the system refrigerant leakage detected by the refrigerant leakage detection mode;
MCn is the system refrigerant quantity detected by the refrigerant leakage quantity detection mode;
MCn-1 is the system refrigerant quantity detected by the last refrigerant leakage quantity detection mode.
The air conditioner of the embodiment calculates the system refrigerant quantity MC and the system refrigerant leakage quantity Δmc through the relevant function of the supercooling degree SCz of the outdoor heat exchanger 3, digitizes the system refrigerant quantity MC and the system refrigerant leakage quantity Δmc, and improves the accuracy of detecting the system refrigerant leakage quantity Δmc.
In some embodiments of the application, a main liquid pipe temperature sensor 18 is provided at the outlet of the outdoor heat exchanger 3, which is connected to the controller for detecting the main liquid pipe temperature Te and transmitting it to the controller. System refrigerant quantity function mc= ((RCa SCz) 2 In +rcb SCz +rcc) Vo)/Vos, the supercooling SCz of the outdoor heat exchanger 3 is the average supercooling at the main liquid pipe temperature sensor 18, and can be calculated by the difference between the refrigerant saturation temperature Tc corresponding to the maximum system exhaust pressure and the main liquid pipe average temperature te_ave.
The indoor volume Vo of the outdoor unit is pre-stored in the controller; the on-line indoor unit internal volume is calculated by the internal volume of each indoor unit pre-stored in the controller; RCa, RCb, RCc is a coefficient, and can be obtained by performing function fitting through a system experiment result.
In some embodiments of the present application, referring to fig. 1, 2, 3, 4, and 6, an air conditioner includes an indoor temperature sensor and an outdoor temperature sensor, which are respectively connected to a controller, for detecting an indoor ambient temperature TN and an outdoor ambient temperature TW, and transmitting the detected indoor ambient temperature TN and the detected outdoor ambient temperature TW to the controller.
When the operation refrigerant leakage amount detection mode is selected, the ambient temperature is first determined. The controller is configured with an outdoor ambient temperature threshold, an indoor ambient temperature threshold, and configured to receive an outdoor ambient temperature TW, an indoor ambient temperature TN, and compare the outdoor ambient temperature TW with the outdoor ambient temperature threshold, and the indoor ambient temperature TN with the indoor ambient temperature threshold. And when the outdoor environment temperature TW is within the outdoor environment temperature threshold range and the indoor environment temperature TN is within the indoor environment temperature threshold, starting a refrigerant leakage quantity detection mode.
The air conditioner of the embodiment ensures a stable operation refrigeration mode through judging the indoor environment temperature TN and the outdoor environment temperature TW, prevents leakage detection failure or inaccuracy of the system refrigerant quantity MC caused by unstable system, and improves the reliability and stability of refrigerant leakage detection.
In some embodiments of the application, the outdoor ambient temperature threshold is a range value (TW 1, TW 2); TW1 is more than or equal to-20 ℃; TW2 is less than or equal to 43 ℃; the indoor ambient temperature threshold is a range value (TN 1, TN 2); TN1 is more than or equal to 10 ℃; TN2 is less than or equal to 35 ℃.
In some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, 6 and 7, the air conditioning apparatus includes a discharge temperature sensor 16, which is connected to the controller, disposed at the outlet of the compressor 1, for detecting and transmitting the compressor discharge temperature Td to the controller.
The controller is configured with a compressor discharge temperature variation threshold DeltaT, an indoor unit superheat minimum threshold SH1, an indoor unit superheat maximum threshold SH2, and a time threshold T.
The controller is configured to acquire the compressor discharge temperature Td and the indoor unit superheat SH in a circulating manner when the refrigerant leakage detection mode is started and the operation time of the compressor 1 is longer than the operation setting time of the compressor, and compare the variation value of the compressor discharge temperature Td with the compressor discharge temperature variation threshold Δt, the minimum value of the indoor unit superheat SH with the indoor unit superheat minimum threshold, and the maximum value of the indoor unit superheat SH with the indoor unit superheat maximum threshold SH2.
When the variation value of the compressor discharge temperature Td is smaller than the variation threshold DeltaT of the compressor discharge temperature, and the minimum value of the indoor unit superheat degree SH is larger than the minimum value threshold SH1 of the indoor unit superheat degree, and the duration time that the maximum value of the indoor unit superheat degree SH is smaller than the maximum value threshold SH2 of the indoor unit superheat degree exceeds the time threshold T, calculating the refrigerant quantity MC of the system.
According to the embodiment of the application, the system operation stability of the air conditioner is ensured by judging the exhaust temperature Td of the compressor and judging the superheat degree SH of the indoor unit, and the accuracy and reliability of refrigerant quantity calculation are improved.
In some embodiments of the application, the set time range for the operation of the compressor is 10 min-20 min; the value range of the change threshold DeltaT of the exhaust temperature of the compressor is 2-4 ℃. The minimum superheat threshold SH1 of the indoor unit is preferably 2 ℃; the maximum superheat degree threshold SH2 of the indoor unit is preferably 8 ℃; the value range of the time threshold t is preferably 2-5 min.
The air conditioner further comprises an evaporator outlet temperature sensor 19 and an evaporation temperature sensor 14, which are respectively connected with the controller, respectively arranged at the outlet of the indoor heat exchanger 8 and the inlet of the indoor heat exchanger 8, and used for detecting the evaporator outlet temperature Tg and the evaporation temperature Tl and transmitting the detected evaporator outlet temperature Tg and the evaporation temperature Tl to the controller. The superheat degree SH of the indoor unit is the superheat degree of the outlet of the indoor heat exchanger 8, and is calculated by the difference between the outlet temperature of the indoor heat exchanger 8 and the evaporating temperature Tl.
In some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, 6, 7 and 8, the indoor unit superheat control includes the following.
The indoor unit expansion valve 7 is connected with the controller; the controller is configured with an expansion valve opening initial value EVI0, a preset superheat degree SH0, a first set value a and a second set value b, and is configured to control the indoor unit expansion valve 7 to start to operate with the expansion valve opening initial value EVI0, and to circularly obtain the indoor unit superheat degree SH and compare the indoor unit superheat degree SH with the preset superheat degree SH0.
When the difference between the superheat degree SH of the indoor unit and the preset superheat degree SH0 is greater than the first set value a, the indoor unit expansion valve 7 is controlled to increase the opening degree for operation. That is, the expansion valve opening EVI increases.
When the difference between the superheat degree SH of the indoor unit and the preset superheat degree SH0 is smaller than the second set value b, the indoor unit expansion valve 7 is controlled to reduce the opening degree. That is, the expansion valve opening EVI decreases. The first set value a is larger than the second set value b.
The air conditioning device of the embodiment maintains the superheat degree SH of the indoor unit within a stable range through the superheat degree control of the indoor unit, improves the running stability of the system, and makes the refrigerant quantity MC of the system only related to the supercooling degree SCz of the outdoor heat exchanger 3.
In some embodiments of the application, the first set point a is a constant, which is greater than 0. The second set value b is a constant, which is less than 0.
In some embodiments of the present application, the value range of the first set value a is (0, 10). The value range of the second set value b is (-10, 0).
In some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, 6, 7 and 9, the system high voltage control includes the following.
The outdoor fan 4 is connected with a controller. The air conditioner further includes an exhaust pressure sensor 17 connected to the controller and provided on the high pressure side of the piping for detecting the system high pressure Pd and transmitting it to the controller.
The controller is configured with an initial value FO0 of the operating frequency of the outdoor fan, presets a system high voltage PdO, a third set value c and a fourth set value d, and is configured to control the outdoor fan 4 to start operating at the initial value FO0 of the operating frequency of the outdoor fan; the controller circularly acquires the system high pressure Pd and compares the system high pressure Pd with a preset system high pressure PdO.
When the difference between the system high pressure Pd and the preset system high pressure PdO is larger than the third set value c, the operating frequency FO of the outdoor fan is controlled to be increased. .
When the difference between the system high pressure Pd and the preset system high pressure PdO is smaller than the fourth set value d, the operating frequency FO of the outdoor fan is controlled to be reduced.
The third set value c and the fourth set value d are constants, and the third set value c is larger than the fourth set value d.
The air conditioning device of the embodiment ensures that the distribution of the refrigerant in the outdoor heat exchanger 3 is stable and uniform and the density is stable at a specific value through the control of the system high pressure, the refrigerant quantity in the outdoor heat exchanger 3 is only related to the supercooling degree SCz of the outdoor heat exchanger 3, and the accuracy and the reliability of the calculation of the refrigerant quantity in the outdoor heat exchanger 3 are improved.
In some embodiments of the application, the preset system high pressure PdO is set according to the ambient temperature. That is, the ambient temperature is different, and the preset system high voltage PdO is set to a different value. The value range of the preset system high voltage PdO is (1.0,4.0), and the unit is MPa.
In some embodiments of the present application, the third set value c is greater than 0, and the range of values is (0, 1.0). The fourth set value d is smaller than 0, and the value range is (-1.0, 0).
In some embodiments of the present application, referring to fig. 1, 2, 3, 4, 5, 6, 7 and 10, the evaporation temperature control includes the following.
The air conditioner further comprises an evaporating temperature sensor 14 which is connected with the controller, is arranged in front of the inlet of the indoor heat exchanger 8, and is used for detecting evaporating temperature Tl and transmitting the evaporating temperature Tl to the controller; the controller is configured with a compressor operation frequency initial value Hi0, a preset evaporation temperature Tl o, a fifth set value e, and a sixth set value f, and is configured to control the compressor 1 to operate at the compressor operation frequency initial value Hi0, circularly obtain the evaporation temperature Tl, and compare the evaporation temperature Tl with the preset evaporation temperature TlO.
When the difference between the evaporation temperature Tl and the preset evaporation temperature TlO is greater than the fifth set value e, the compressor operation frequency Hi is controlled to increase.
When the difference between the evaporation temperature Tl and the preset evaporation temperature TlO is smaller than the sixth set value, the compressor operation frequency Hi is controlled to decrease.
The fifth set value e and the sixth set value f are constants, and the fifth set value e is larger than the sixth set value f.
The air conditioner of the present embodiment controls the evaporation temperature Tl by adjusting the compressor operation frequency Hi so as to be maintained within a specific range, i.e., controls the system low pressure so as to be maintained within a specific range, stabilizes the distribution of the refrigerant in the indoor heat exchanger 8, maintains the density at a specific value, and improves the accuracy and stability of the calculation of the refrigerant amount in the indoor heat exchanger 8.
In some embodiments of the present application, the fifth set value e is greater than 0, and the range of values is (0, 5). The sixth set value f is smaller than 0, and the value range is (-5, 0).
In some embodiments of the present application, referring to fig. 3 and 4, the air conditioner further includes a display module 12 connected to the controller.
The controller is configured with a plurality of codes, which respectively correspond to different refrigerant leakage levels. That is, different codes correspond to refrigerant leakage amounts in different level ranges.
The controller is configured to determine a code corresponding to the system refrigerant leakage Δmc, and control the display module 12 to display the code.
The air conditioner of the embodiment enables a maintainer to read codes by displaying the codes by the display module 12 to directly obtain the range of the leakage amount DeltaMC of the system refrigerant, further judges the type of refrigerant leakage fault, simplifies display, reduces display cost and improves detection and maintenance efficiency.
In some embodiments of the present application, when the refrigerant leakage detection mode is operated for the first time, the system refrigerant leakage Δmc cannot be detected without the last system refrigerant MC value, and the controller calculates the current system refrigerant MC and then controls the display module 12 to display the detection end.
In some embodiments of the present application, the initial value of the refrigerant quantity is pre-stored in the controller. When the refrigerant leakage detection mode is operated for the first time, the system refrigerant leakage delta MC is equal to the difference between the current system refrigerant quantity MC and a pre-stored initial value of the refrigerant quantity, and is used for judging whether the system has leakage relative to the initial value.
In some embodiments of the present application, referring to fig. 3, the air conditioning system further includes a wire controller Y including a display 121, a wire controller C1; the display 121 is a display module 12, which is connected to the line controller C1, and is controlled by the line controller C1 to display a corresponding code.
The wire controller C1 is configured with a refrigerant leakage amount detection mode; the display 121 is a touch display provided with a refrigerant leakage amount detection mode button by which the refrigerant leakage amount detection mode is operated.
In some embodiments of the present application, referring to fig. 3, the air conditioning system further includes a wire controller Y including a display 121, a wire controller C1; the display 121 is a display module 12, which is connected to the line controller C1, and is controlled by the line controller C1 to display a corresponding code.
The wire controller C1 is configured with a refrigerant leakage amount detection mode; the wire controller Y also comprises a plurality of mechanical keys which are respectively connected with the wire controller C1; and operating the refrigerant leakage detection mode by operating at least one mechanical key.
When the system refrigerant leakage amount Δmc detection mode is operated, the line controller C1 controls the display 121 to display a corresponding mode operation identifier.
The air conditioner of the embodiment prevents the user from affecting the user experience by starting the refrigerant leakage amount detection mode through misoperation of the user.
In some embodiments of the present application, referring to fig. 3, the controller includes a line controller C1, an indoor controller C2, an outdoor controller C3; the indoor controller C2 is respectively in communication connection with the outdoor controller C3 and the wire controller C1; the controller configuration content is respectively configured in any one or more of the line controller C1, the indoor controller C2 and the outdoor controller C3.
In some embodiments of the present application, referring to fig. 4, the controller includes an indoor controller C2, an outdoor controller C3; the indoor controller C2 is in communication connection with the outdoor controller C3; the outdoor unit also comprises an outdoor electric control board which is provided with a refrigerant leakage quantity detection execution switch; the outdoor controller C3 is arranged on the outdoor electric control board and is connected with the refrigerant leakage detection execution switch. The controller configuration content is respectively configured in any one or more of the indoor controller C2 and the outdoor controller C3.
When the refrigerant leakage amount detection execution switch is operated, the outdoor controller C3 controls the operation of the refrigerant leakage amount detection mode.
The air conditioner device of the embodiment realizes the control of the operation of the refrigerant leakage detection mode through the outdoor electric control board, reduces the cost, thoroughly avoids misoperation of a user and improves the user experience.
In some embodiments of the present application, the outdoor electronic control board may implement the opening and closing of the refrigerant leakage detection mode through the dial switch.
In some embodiments of the present application, the outdoor electronic control board further includes at least one LED lamp, through which the code is displayed by flashing, reducing the cost of the display module.
The above description is only a preferred embodiment of the present application, and is not intended to limit the application in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present application still fall within the protection scope of the technical solution of the present application.
Claims (7)
1. An air conditioner comprises an outdoor unit, at least one indoor unit and a controller; the indoor unit is connected with the outdoor unit; the outdoor unit comprises a compressor and an outdoor heat exchanger; the indoor unit comprises an indoor heat exchanger and is characterized in that the controller is configured with a refrigerant leakage detection mode, and when the controller is started, the indoor unit is controlled to operate in a refrigeration mode; and executing the superheat control of the indoor unit, the high-pressure control of the system and the evaporation temperature control;
the superheat control of the indoor unit comprises the following steps of;
the indoor unit further comprises an indoor unit expansion valve which is connected with the controller and is arranged in front of the inlet of the indoor heat exchanger;
the controller is configured with an expansion valve opening initial value, a preset superheat degree, a first set value and a second set value, and is configured to control the indoor unit expansion valve to operate at the expansion valve opening initial value, acquire the indoor unit superheat degree and compare the indoor unit superheat degree with the preset superheat degree;
when the difference between the superheat degree of the indoor unit and the preset superheat degree is larger than the first set value, controlling the expansion valve of the indoor unit to increase the opening degree;
when the difference between the superheat degree of the indoor unit and the preset superheat degree is smaller than the second set value, controlling the expansion valve of the indoor unit to reduce the opening;
the first set value and the second set value are constants, and the first set value is larger than the second set value;
the system high voltage control includes the following;
the outdoor unit further comprises an outdoor fan which is connected with the controller; the controller is configured with an initial operating frequency of the outdoor fan, a preset high-pressure value, a third set value and a fourth set value, and is configured to control the outdoor fan to operate at the initial operating frequency of the outdoor fan, acquire a system high pressure and compare the system high pressure with the preset high pressure value;
when the difference between the system high pressure and the preset high pressure value is larger than the third set value, controlling the operation frequency of the outdoor fan to be increased;
when the difference between the system high pressure and the preset high pressure value is smaller than the fourth set value, controlling the operation frequency of the outdoor fan to be reduced;
the third set value and the fourth set value are constants, and the third set value is larger than the fourth set value;
the evaporation temperature control includes the following;
the controller is configured with an initial value of the operation frequency of the compressor, a preset evaporation temperature, a fifth set value and a sixth set value, and is configured to control the compressor to operate at the initial value of the operation frequency of the compressor, obtain the evaporation temperature, and compare the evaporation temperature with the preset evaporation temperature;
when the difference between the evaporation temperature and the preset evaporation temperature is larger than the fifth set value, controlling the operation frequency of the compressor to be increased;
controlling the compressor operation frequency to decrease when the difference between the evaporation temperature and the preset evaporation temperature is smaller than the sixth set value;
the fifth set value and the sixth set value are constants, and the fifth set value is larger than the sixth set value;
the controller is provided with a compressor operation setting time and is configured to judge whether the operation time of the compressor in the refrigerant leakage amount detection mode reaches the compressor operation setting time; if yes, the supercooling degree of the outdoor heat exchanger is obtained and used for calculating the refrigerant quantity of the system;
the system refrigerant leakage amount is equal to the difference between the system refrigerant amounts in the two adjacent refrigerant leakage amount detection modes.
2. The air conditioner according to claim 1, wherein the controller is further configured with an indoor unit internal volume and an outdoor unit internal volume; the system refrigerant amount is calculated as follows:
MC=（（RCa*SCz 2 +RCb*SCz+RCc）*Vo）/Vos；
MC is the refrigerant quantity of the system;
SCz is the subcooling of the outdoor heat exchanger;
vo is the inner volume of the outdoor unit;
vos is the online indoor unit internal volume;
RCa, RCb, RCc is a coefficient.
3. The air conditioner according to claim 1, wherein the controller is configured to first make an ambient temperature judgment when the refrigerant leakage amount detection mode is selected;
the controller is configured with an outdoor ambient temperature threshold and an indoor ambient temperature threshold, and is configured to acquire an outdoor ambient temperature and an indoor ambient temperature, compare the outdoor ambient temperature with the outdoor ambient temperature threshold, and the indoor ambient temperature with the indoor ambient temperature threshold, and activate the refrigerant leakage amount detection mode when the outdoor ambient temperature is within the outdoor ambient temperature threshold range and the indoor ambient temperature is within the indoor ambient temperature threshold range.
4. The air conditioner according to claim 1, wherein the controller is configured with a compressor discharge temperature change threshold, an indoor unit superheat minimum threshold, an indoor unit superheat maximum threshold, and a time threshold;
the controller is configured to circularly acquire a compressor discharge temperature and an indoor unit superheat degree when the refrigerant leakage detection mode is started and the operation time of the compressor is longer than the operation setting time of the compressor, and compare the compressor discharge temperature change value with the compressor discharge temperature change threshold, the minimum value of the indoor unit superheat degree with the indoor unit superheat degree minimum value threshold, and the maximum value of the indoor unit superheat degree with the indoor unit superheat degree maximum value threshold;
and when the compressor exhaust temperature change value is smaller than the compressor exhaust temperature change threshold, and the duration that the minimum value of the indoor unit superheat degree is larger than the minimum value threshold of the indoor unit superheat degree and the maximum value of the indoor unit superheat degree is smaller than the maximum value threshold of the indoor unit superheat degree exceeds the time threshold, calculating the system refrigerant quantity.
5. The air conditioning apparatus according to any one of claims 1 to 4, further comprising a display module connected to the controller; the controller is configured with a plurality of codes; each code corresponds to a different range value of the system refrigerant leakage quantity;
the controller is configured to judge the code corresponding to the refrigerant leakage amount and control the display module to display the code.
6. The air conditioning apparatus of claim 5, further comprising a drive-by-wire comprising a display, a drive-by-wire controller; the wire controller is configured with a refrigerant leakage detection mode;
the controller comprises an indoor controller, an outdoor controller and a wire controller; the indoor controller is respectively in communication connection with the wire controller and the outdoor controller; the code is displayed by the display controlled by the wire controller.
7. The air conditioning unit of claim 5, wherein the controller comprises an indoor controller, an outdoor controller, which are communicatively connected; the outdoor unit comprises an outdoor electric control board which is provided with a refrigerant leakage quantity detection execution switch; the outdoor controller is arranged on the outdoor electric control board and is connected with the refrigerant leakage detection execution switch;
when the refrigerant leakage amount detection execution switch is operated, the outdoor controller controls the operation of the refrigerant leakage amount detection mode.
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