CN110608513B - Control method of air conditioning system - Google Patents
Control method of air conditioning system Download PDFInfo
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- CN110608513B CN110608513B CN201910917879.9A CN201910917879A CN110608513B CN 110608513 B CN110608513 B CN 110608513B CN 201910917879 A CN201910917879 A CN 201910917879A CN 110608513 B CN110608513 B CN 110608513B
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- defrosting
- heat storage
- storage module
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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
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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Abstract
The invention provides a control method of an air conditioning system, wherein the method comprises the following steps: comprises a detection step for detecting whether the operation mode of the air conditioning system is a heating mode or a defrosting mode and the temperature T of an inlet pipe of the heat storage moduleIntoAnd the pipe temperature TGo outAnd defrosting of air conditioning systemTime tTransforming(ii) a Further comprising a judging step of judging T in the heating modeIntoAnd TGo outWhether all are less than T1And judging the defrosting time t in the defrosting modeTransformingWhether or not > t2Wherein T is1And t2Is a constant; and the control step is used for controlling whether the opening degree of the fourth throttling device is adjusted to the maximum step number or not according to the result of the judging step, or controlling the system to enter a common internal defrosting mode when the heat storage module is judged to have a fault. The invention can effectively and accurately judge whether the heat storage module has a fault, prevents the condition that the unit cannot normally defrost due to the fault of the heat storage module, and ensures continuous defrosting and maintains reliable and stable operation of the system.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a control method of an air conditioning system.
Background
The air source heat pump frosting problem is a key technical problem of an air conditioner, and has obvious influence on heating performance and comfort. The total area of the hot summer and cold winter areas, the cold areas and the severe cold areas accounts for about 85 percent of the total area of the whole country. These areas require heating in the winter, and most of them have frosting during heating in the winter.
When the traditional heat pump air conditioner operates in winter for heat supply, a four-way valve reversing defrosting method is adopted. This solution is simple to operate, but has the following drawbacks: 1. the indoor temperature fluctuation is big, and thermal comfort is poor, 2, the temperature rises slowly again, and interior fan after the defrosting, need wait that the inner tube temperature rises after can reopen, and frequency conversion compressor rises frequently and need experience a section process, has prolonged the time of resumeing the heat supply. 3. Long defrosting time, and insufficient low-level heat source under the condition of severe frosting, thereby further prolonging the defrosting time and the heat recovery time.
The air conditioner in the prior art has the defects of large indoor temperature fluctuation and poor thermal comfort degree during defrosting; the temperature rises slowly, the inner fan can be restarted after the temperature of the inner pipe rises after defrosting is finished, and the frequency rising of the variable frequency compressor needs to go through a process, so that the time for recovering heat supply is prolonged; the defrosting time is long, and a low-level heat source is insufficient under the condition of severe frosting; the heat storage module fails to lead to the problem that the unit cannot be defrosted normally, the problem of unit abnormity is further caused, and the technical problems of defrosting time, heat supply recovery time and the like are further prolonged.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the unit cannot normally defrost due to the failure of the heat storage module during defrosting of the air conditioner in the prior art, and further the unit is abnormal, so that the control method of the air conditioner system is provided.
The invention provides a control method of an air conditioning system, wherein the method comprises the following steps:
the air conditioning system comprises a compressor, an outer heat exchanger, a heat storage module and an indoor unit, wherein a fourth throttling device is further arranged on a pipeline between the heat storage module and the outer heat exchanger;
the control method comprises a detection step for detecting whether the operation mode of the air conditioning system is a heating mode or a defrosting mode and the temperature T of the inlet pipe of the heat storage moduleIntoAnd the pipe temperature TGo outAnd defrosting time t of air conditioning systemTransforming；
Further comprising a judging step of judging T in the heating modeIntoAnd TGo outWhether all are less than T1And judging the defrosting time t in the defrosting modeTransformingWhether or not > t2Wherein T is1And t2Is a constant;
and the control step is used for controlling whether the opening degree of the fourth throttling device is adjusted to the maximum step number or not according to the result of the judging step, or controlling the system to enter a common internal defrosting mode when the heat storage module is judged to have a fault.
Preferably, the first and second electrodes are formed of a metal,
wherein said T is1The value range of (30-60 ℃); and/or the value range of t2 is (6-15 min).
Preferably, the first and second electrodes are formed of a metal,
when the judging step judges TIntoAnd TGo outAre all < T1And judging the defrosting time t in the first defrosting periodTransforming＞t2And the control step controls the fourth throttling device to forcibly reach the maximum step number in the next defrosting period.
Preferably, the first and second electrodes are formed of a metal,
when the detecting step and the judging step detect and judge T in the next defrosting periodIntoAnd TGo outAnd when the number of the steps is larger than T1, the control step controls the fourth throttling device to forcibly reach the maximum number of steps in the subsequent defrosting period.
Preferably, the first and second electrodes are formed of a metal,
when the detection step and the judgment step detect and judge T in the next defrosting periodIntoAnd TGo outWhen all are less than T1, and the defrosting time T is detected and judgedTransformingT2, the control step controls the fourth throttling device to forcibly reach the maximum step number in the subsequent defrosting period.
Preferably, the first and second electrodes are formed of a metal,
when the detecting step and the judging step detect and judge T in the next defrosting periodIntoAnd TGo outAre all < T1Then, the defrosting time t is detected and judgedTransformingIf the temperature is higher than t2, the fault of the heat storage module is judged to be undetermined.
Preferably, the first and second electrodes are formed of a metal,
and when N defrosting cycles are continued, and when the detection step and the judgment step both detect and judge that the heat storage module has a mark position with a fault to be determined, judging that the heat storage module has a fault, wherein N is a natural number.
Preferably, the first and second electrodes are formed of a metal,
and when the fault of the heat storage module is judged, controlling the air conditioning system to switch into a common indoor defrosting mode by the control step when the unit is defrosted in the next defrosting period.
Preferably, the first and second electrodes are formed of a metal,
the indoor unit comprises a heat exchanger II capable of heating and a heat exchanger I capable of refrigerating during defrosting, and a second throttling device and a third throttling device are further arranged and connected with the heat exchanger II;
the common internal defrosting mode comprises the following steps: and controlling the third throttling device to be opened, controlling the second throttling device to be closed, switching the heat exchanger to be an evaporation side, and performing evaporation heat exchange to defrost.
Preferably, the first and second electrodes are formed of a metal,
before the first defrosting period, when the judging step judges TIntoAnd TGo outAre all > T1Controlling the heat storage module to normally defrost the external heat exchanger; and/or said N is 3.
The control method of the air conditioning system provided by the invention has the following beneficial effects:
the invention detects the operation mode and the temperature T of the refrigerant inlet pipeIntoAnd refrigerant outlet pipe temperature TGo outAnd defrosting time t of air conditioning systemTransformingWhen the operation mode is operated to the heating mode, and TIntoAnd TGo outAre all > T1At the moment, the heat storage capacity of the heat storage module can be sufficient, and the heat storage module is not required to be in failure; but if TIntoAnd TGo outAre all < T1When the defrosting is carried out, the situation that the heat storage amount is insufficient is described, but whether the heat storage module is caused by faults or insufficient valve opening is further judged by judging the defrosting time in the defrosting mode, if the opening of the expansion valve is insufficient, the opening of the expansion valve is controlled to be the maximum, and if the opening of the expansion valve is accurately judged to be caused by the faults of the heat storage module, the normal defrosting mode of the heat storage module is switched to the normal internal defrosting mode of the internal heat exchanger, so that the defrosting process is maintained to be continued, whether the heat storage module is in faults or not can be effectively and accurately judged, namely whether the heat storage module is normal or not is automatically detected, the situation that the unit cannot normally defrost due to the faults of the heat storage module is prevented, and the situation that the unit cannotThe abnormal condition of the air conditioning unit is avoided, the continuous defrosting is ensured, and the reliable and stable operation of the system is maintained.
Drawings
Fig. 1 is a schematic view of the structure of an air conditioning system of the present invention.
The reference numbers in the figures denote:
1. a compressor; 2. an external heat exchanger; 3. an indoor unit; 31. a first heat exchanger; 32. a second heat exchanger; 4. a heat storage module; 51. a first throttling device (or EXV 1); 52. a second throttling device (or EXV 2); 53. a third throttling device (or EXV 3); 54. a fourth throttling device (or EXV 4); 55. a large valve; 56. a small valve; 61. a first four-way valve; 62. a four-way valve II; 7. a gas-liquid separator; 8. an oil separator; 91. an electromagnetic valve; 92. a third valve; 10. and (4) an oil return capillary tube.
Detailed Description
As shown in fig. 1, the present invention provides a control method of an air conditioning system, which includes:
the air conditioning system comprises a compressor 1, an outer heat exchanger 2, an outer fan, a first four-way valve 61, a second four-way valve 62, a large valve 55, a small valve 56, a third valve 92, a heat storage module 4 and an indoor unit 3, wherein a fourth throttling device 54 is further arranged on a pipeline between the heat storage module 4 and the outer heat exchanger 2;
the control method comprises a detection step for detecting whether the operation mode of the air conditioning system is a heating mode or a defrosting mode and the temperature T of a refrigerant inlet pipe of the heat storage moduleIntoAnd refrigerant outlet pipe temperature TGo outAnd defrosting time t of air conditioning systemTransforming；
Further comprising a judging step of judging T in the heating modeIntoAnd TGo outWhether all are less than T1And judging the defrosting time t in the defrosting modeTransformingWhether or not > t2Wherein T is1And t2Is a constant;
and a control step, which is used for controlling whether the opening degree of the fourth throttling device 54 is adjusted to the maximum step number or not according to the result of the judging step, or controlling the system to enter a common internal defrosting mode when the heat storage module is judged to have a fault.
The invention detects the operation mode and the temperature T of the refrigerant inlet pipeIntoAnd refrigerant outlet pipe temperature TGo outAnd defrosting time t of air conditioning systemTransformingWhen the operation mode is operated to the heating mode, and TIntoAnd TGo outAre all > T1At the moment, the heat storage capacity of the heat storage module can be sufficient, and the heat storage module is not required to be in failure; but if TIntoAnd TGo outAre all < T1If the opening of the expansion valve is insufficient, the opening of the expansion valve is controlled to be maximum, and if the opening of the expansion valve is accurately judged to be caused by the fault of the heat storage module, the normal defrosting mode of the internal heat exchanger is switched to, so that the defrosting process is maintained to be continued, whether the heat storage module is in fault or not can be effectively and accurately judged, namely whether the heat storage module is normal or not is automatically detected, the condition that the unit cannot normally defrost due to the fault of the heat storage module is prevented, the abnormal condition of the air conditioning unit is prevented and avoided, the continuous defrosting is ensured, and the reliable and stable operation of the system is maintained; can guarantee to change the frost occasionally sufficient heat and change the frost for whole air conditioning system changes the frost period indoor temperature fluctuation little, its time of recovering the heat supply is shorter, can recover the heat supply very fast, has guaranteed indoor sustainable heating effectively.
Preferably, the first and second electrodes are formed of a metal,
wherein said T is1The value range of (30-60 ℃); and/or the value range of t2 is (6-15 min). This is T of the invention1The value range of (30-60 ℃) indicates that the heat storage module is sufficient in heat storage when the temperature of a refrigerant inlet pipe and the temperature of a refrigerant outlet pipe of the heat storage module are higher than (30-60 ℃), and is insufficient in heat storage when the temperature of the refrigerant outlet pipe and the temperature of the refrigerant outlet pipe are lower than (30-60 ℃); the value range of t2 is (6-15 min) which indicates defrosting time tTransformingIf the time is more than (6-15 min), the defrosting time is too long, which may be caused by the fault problem of the heat storage module orThe opening degree of the fourth throttling device (EXV4) is small, so that the further judgment is needed to judge which reason is the reason, whether the heat storage module stores enough heat is mainly judged by the temperature and the defrosting time of the heat storage module, if the temperature of the heat storage module meets the requirement, the heat storage amount is sufficient, and if the temperature of the heat storage module is not sufficient, the defrosting time meets the requirement, the heat storage amount is also considered to meet the requirement of the unit; therefore, whether the heat storage module breaks down or not is effectively judged from two aspects, and the defrosting process of the unit is normally carried out.
Preferably, the first and second electrodes are formed of a metal,
when the judging step judges TIntoAnd TGo outAre all < T1And judging the defrosting time t in the first defrosting periodTransforming＞t2And the control step controls the fourth throttling device (54) to forcibly reach the maximum number of steps in the next defrosting period. At the moment of judging TIntoAnd TGo outAre all < T1If the heat storage quantity of the heat storage module is insufficient, the defrosting time t needs to be judged in the first defrosting periodTransformingWhether or not > t2But now tTransforming＞t2If the defrosting time is too long, the fourth throttling device (54) is controlled to forcibly reach the maximum step number in the next defrosting period to effectively judge whether the defrosting period is long due to the fact that the opening degree of the throttling device is small, whether the defrosting period is long due to the fact that the heat storage module is in fault or the opening degree of the throttling device is small is accurately judged, accurate judgment is achieved, defrosting control is accurately carried out, and indoor continuous heating is guaranteed.
Preferably, the first and second electrodes are formed of a metal,
when the detecting step and the judging step detect and judge T in the next defrosting periodIntoAnd TGo outWhen the number of the steps is larger than T1, the control step controls the fourth throttling device 54 to forcibly reach the maximum number of steps in the subsequent defrosting period. When entering the next defrosting period after the judgment and control process of the first defrosting period is finished, if the next defrosting period is detected and judged to be TIntoAnd TGo outWhen the temperature is greater than T1, the regulation heat storage module after one defrosting periodThe temperature of the tube(s) has reached the requirement, that is, the stored heat is sufficient enough at this time, but in order to avoid long defrosting time caused by insufficient stored heat in the subsequent defrosting cycle, the fourth throttling device 54 is controlled to forcibly reach the maximum step number in the subsequent defrosting cycle, so that the subsequent defrosting cycle can be further effectively ensured to be normally performed, and the required defrosting is completed (in this case, the tube temperature is low and the defrosting time is too long in the first defrosting cycle, which are not caused by the failure of the heat storage module, are effectively eliminated).
Preferably, the first and second electrodes are formed of a metal,
when the detection step and the judgment step detect and judge T in the next defrosting periodIntoAnd TGo outWhen all are less than T1, and the defrosting time T is detected and judgedTransformingT2, the control step controls the fourth throttling device (54) to be forced to reach the maximum step number in the subsequent defrosting period. When entering the next defrosting period after the judgment and control process of the first defrosting period is finished, if the next defrosting period is detected and judged to be TIntoAnd TGo outWhen the temperature of the pipe of the heat storage module is less than T1, it is indicated that the temperature of the pipe of the heat storage module passing through a defrosting cycle still does not meet the requirement, but the defrosting time is reduced below T2, and it can be considered that the heat storage capacity of the heat storage module can meet the requirement of the air conditioning unit, but in this case, similarly, in order to avoid the long defrosting time caused by insufficient heat storage capacity of the subsequent defrosting cycle, the fourth throttling device 54 is controlled to forcibly reach the maximum step number in the subsequent defrosting cycle, so that the normal running of the subsequent defrosting cycle can be further effectively ensured, and the proper defrosting is completed (in this case, the low pipe temperature and the long defrosting time in the first defrosting cycle, which are not caused by the fault of the heat storage module, are effectively eliminated).
Preferably, the first and second electrodes are formed of a metal,
when the detecting step and the judging step detect and judge T in the next defrosting periodIntoAnd TGo outAre all < T1Then, the defrosting time t is detected and judgedTransformingIf the temperature is higher than t2, the fault of the heat storage module is judged to be undetermined. When entering the next defrosting period after the judgment and control process of the first defrosting period is finished, if the next defrosting period is detected and judged to be TIntoAnd TGo outWhen the temperature of the pipe of the heat storage module is less than T1, the temperature of the pipe of the heat storage module is not adjusted to meet the requirement after one defrosting cycle, and the defrosting time is still higher than T2, the temperature is detected and judged twice, and the opening of the throttle device of the heat storage module is adjusted to be large, the defrosting requirement of the unit is not met, so that the heat storage module is temporarily set as an object with a fault to be determined, and due defrosting cannot be finished (in this case, the temperature of the pipe is low and the defrosting time is too long during the first defrosting cycle due to the fault of the heat storage module).
Preferably, the first and second electrodes are formed of a metal,
and when N defrosting cycles are continued, and when the detection step and the judgment step both detect and judge that the heat storage module has a mark position with a fault to be determined, judging that the heat storage module has a fault, wherein N is a natural number. If the undetermined zone bit that the heat storage module breaks down is judged in N continuous periods, the heat storage module can be judged to break down, the multi-period continuous judgment mode effectively prevents and avoids the situation that the judgment result is inaccurate due to insufficient judgment times, the judgment accuracy and the judgment precision are improved, and the situation that the unit cannot be defrosted normally and is further abnormal due to the fact that the heat storage module breaks down is avoided.
Preferably, the first and second electrodes are formed of a metal,
and when the fault of the heat storage module is judged, controlling the air conditioning system to switch into a common indoor defrosting mode by the control step when the unit is defrosted in the next defrosting period. After the fault of the heat storage module is judged, in order to ensure that the outer machine heat exchanger can continuously maintain the normal defrosting function, the air conditioning system is controlled to be switched into a common inner machine defrosting mode, the inner machine heat exchanger is used for providing heat to defrost the outer machine heat exchanger, and the normal defrosting is ensured to be continuously carried out.
Preferably, the first and second electrodes are formed of a metal,
the indoor unit comprises a heat exchanger II capable of heating and a heat exchanger I capable of refrigerating during defrosting, and a second throttling device and a third throttling device are further arranged and connected with the heat exchanger II;
the common internal defrosting mode comprises the following steps: and controlling the third throttling device to be opened, controlling the second throttling device to be closed, switching the heat exchanger to be an evaporation side, and performing evaporation heat exchange to defrost. This is a preferable configuration of the indoor unit of the present invention and the control procedure, so that the first heat exchanger of the two heat exchangers in the indoor unit can be controlled to perform cooling to absorb heat from the first heat exchanger, thereby performing defrosting treatment on the outer heat exchanger.
Preferably, the first and second electrodes are formed of a metal,
before the first defrosting period, when the judging step judges TIntoAnd TGo outAre all > T1Controlling the heat storage module to normally defrost the external heat exchanger; and/or said N is 3. Before the first defrosting period, when the judging step judges TIntoAnd TGo outAre all > T1The heat storage amount of the heat storage module is sufficient, so that whether the heat storage module has a fault or whether the opening degree of the throttling device is small does not need to be judged, the heat storage module is directly controlled to defrost the external heat exchanger, N is 3, the number of the optimal cycles is selected according to needs.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A control method of an air conditioning system is characterized in that:
the air conditioning system comprises a compressor (1), an outer heat exchanger (2), a heat storage module (4) and an indoor unit (3), wherein a fourth throttling device (54) is further arranged on a pipeline between the heat storage module (4) and the outer heat exchanger (2);
the control method includes a detection step for detecting that an operation mode of the air conditioning system is heatingWhether the mode is a defrosting mode or a pipe inlet temperature T of the heat storage moduleIntoAnd the pipe temperature TGo outAnd defrosting time t of air conditioning systemTransforming；
Further comprising a judging step of judging T in the heating modeIntoAnd TGo outWhether all are less than T1And judging the defrosting time t in the defrosting modeTransformingWhether or not > t2Wherein T is1And t2Is a constant;
the control method further comprises a control step, wherein the control step is used for controlling whether the opening degree of the fourth throttling device (54) is adjusted to the maximum step number or not according to the result of the judging step, or controlling the system to enter a common internal defrosting mode when the heat storage module is judged to have a fault;
when the judging step judges TIntoAnd TGo outAre all < T1And judging the defrosting time t in the first defrosting periodTransforming＞t2And the control step controls the fourth throttling device (54) to forcibly reach the maximum number of steps in the next defrosting period.
2. The control method of an air conditioning system according to claim 1, characterized in that:
wherein said T is1The value range of (a) is 30-60 ℃; and/or the value range of t2 is 6-15 min.
3. The control method of an air conditioning system according to claim 1, characterized in that:
when the detecting step and the judging step detect and judge T in the next defrosting periodIntoAnd TGo outWhen the number of the steps is larger than T1, the control step controls the fourth throttling device (54) to forcibly reach the maximum number of steps in the subsequent defrosting period.
4. The control method of an air conditioning system according to claim 1, characterized in that:
when the detection step and the judgment step detect and judge T in the next defrosting periodIntoAnd TGo outWhen all are less than T1, and the defrosting time T is detected and judgedTransformingT2, the control step controls the fourth throttling device (54) to be forced to reach the maximum step number in the subsequent defrosting period.
5. The control method of an air conditioning system according to claim 1, characterized in that:
when the detecting step and the judging step detect and judge T in the next defrosting periodIntoAnd TGo outAre all < T1Then, the defrosting time t is detected and judgedTransformingIf the temperature is higher than t2, the fault of the heat storage module is judged to be undetermined.
6. The control method of an air conditioning system according to claim 5, characterized in that:
and when N defrosting cycles are continued, and when the detection step and the judgment step both detect and judge that the heat storage module has a mark position with a fault to be determined, judging that the heat storage module has a fault, wherein N is a natural number.
7. The control method of an air conditioning system according to claim 6, characterized in that:
and when the fault of the heat storage module is judged, controlling the air conditioning system to switch into a common indoor defrosting mode by the control step when the unit is defrosted in the next defrosting period.
8. The control method of an air conditioning system according to claim 7, characterized in that:
the indoor unit comprises a second heat exchanger (32) capable of heating during defrosting and a first heat exchanger (31) capable of refrigerating, and is also provided with a second throttling device (52) connected with the second heat exchanger (32) and a third throttling device (53) connected with the first heat exchanger (31);
the common internal defrosting mode comprises the following steps: and controlling the third throttling device (53) to be opened, controlling the second throttling device (52) to be closed, switching the first heat exchanger (31) to be an evaporation side, and performing evaporation heat exchange to defrost.
9. The control method of an air conditioning system according to claim 6, characterized in that:
before the first defrosting period, when the judging step judges TIntoAnd TGo outAre all > T1Controlling the heat storage module (4) to normally defrost the external heat exchanger (2); and/or said N is 3.
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| CN1052939A (en) * | 1989-08-18 | 1991-07-10 | 三菱电机株式会社 | Conditioner |
| CN2482652Y (en) * | 2001-05-23 | 2002-03-20 | 广东科龙电器股份有限公司 | Thermal storage heat pump air conditioner |
| CN2802328Y (en) * | 2005-06-10 | 2006-08-02 | 河南新飞电器有限公司 | Energy-storage compound air-conditioning system |
| CN205747624U (en) * | 2016-05-23 | 2016-11-30 | 珠海格力电器股份有限公司 | Air conditioning system |
| CN106705303B (en) * | 2017-01-10 | 2019-05-14 | 美的集团武汉制冷设备有限公司 | Defrosting control method, defrosting control system and air conditioner |
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