CN115183348A - Dual-system air conditioning unit and control method thereof - Google Patents
Dual-system air conditioning unit and control method thereof Download PDFInfo
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- CN115183348A CN115183348A CN202210801579.6A CN202210801579A CN115183348A CN 115183348 A CN115183348 A CN 115183348A CN 202210801579 A CN202210801579 A CN 202210801579A CN 115183348 A CN115183348 A CN 115183348A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003507 refrigerant Substances 0.000 claims abstract description 147
- 230000007246 mechanism Effects 0.000 claims abstract description 118
- 230000009977 dual effect Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 18
- 238000001816 cooling Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000005057 refrigeration Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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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
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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
- F24F11/80—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
- 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
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
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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
- F24F11/88—Electrical aspects, e.g. 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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- 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)
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- Thermal Sciences (AREA)
- Signal Processing (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a dual-system air conditioning unit and a control method thereof. The double-system air conditioning unit comprises two independent refrigerant circulating systems, wherein each refrigerant circulating system at least comprises a plurality of functional units of a four-way valve, a first on-off mechanism, a condenser, a throttling mechanism and an evaporator. According to the dual-system air conditioning unit and the control method thereof, when the dual-system air conditioning unit operates normally, the first bypass pipeline, the second bypass pipeline, the third bypass pipeline and the fourth bypass pipeline are not communicated; the two refrigerant circulating systems operate independently; when the functional unit of one refrigerant circulating system has an unrecoverable fault, other functional units in the refrigerant circulating system can participate in the refrigerating/heating process of another independent refrigerant circulating system, so that the reliable operation of the dual-system air conditioning unit is finally ensured, and the user experience is improved.
Description
Technical Field
The invention relates to the technical field of air treatment equipment, in particular to a dual-system air conditioning unit and a control method thereof.
Background
With the continuous improvement of the living standard of people, the requirement of people on the comfort of the living environment is higher and higher, and for an air conditioner, the stability of the running of a unit is an important condition for providing a comfortable environment. In order to avoid the problem that the air conditioning system fails to provide comfortable living temperature, a dual-system air conditioner is provided, and after one set of system fails, the other set of system can be started to provide comfortable temperature for users. Therefore, the dual-system air conditioner is not only applied to houses and commercial buildings, but also applied to automobiles by some manufacturers, so that the automobiles can start a single system to save energy, and can start dual systems to meet the refrigeration/heating quantity with larger requirements when needed. However, in the dual-system air conditioner in the prior art, when one of the functional units is damaged or fails, the whole dual-system air conditioning unit cannot operate, and the time for maintaining or waiting for accessories after the failure occurs is long, which seriously affects the user experience.
Disclosure of Invention
In order to solve the technical problem that the functional units in the dual-system air conditioning unit have fault conditions to influence the user experience in the prior art, the dual-system air conditioning unit and the control method thereof are provided, wherein the functional units without fault conditions are fully utilized to ensure the heat exchange effect.
The utility model provides a dual system air conditioning unit, includes two sets of independent refrigerant circulation system, every refrigerant circulation system all has a plurality of functional unit including cross valve, first on-off mechanism, condenser, throttle mechanism and evaporimeter at least, just the cross valve with first on-off mechanism passes through first pipeline intercommunication, first on-off mechanism with the condenser passes through the second pipeline intercommunication, the condenser with throttle mechanism passes through the third pipeline intercommunication, the evaporimeter with be provided with second on-off mechanism between the cross valve, the evaporimeter with second on-off mechanism passes through the fourth pipeline intercommunication, and two be connected with first bypass pipeline between the first bypass pipeline, two be connected with the second bypass pipeline between the second pipeline, two be connected with the third bypass pipeline between the third pipeline, two be connected with the fourth bypass pipeline between the fourth pipeline, just first bypass pipeline, the second bypass pipeline, the third bypass pipeline and the fourth bypass pipeline all independently control intercommunication or close.
The flow rate and/or pressure of the refrigerant flowing to the two evaporators are the same; and/or the flow rate and/or pressure of the refrigerant flowing to the two condensers are the same.
The dual-system air conditioning unit further comprises indoor units, and the two evaporators are arranged in the indoor units in parallel.
The dual-system air conditioning unit further comprises a temperature detection mechanism, the temperature detection mechanism is arranged at the indoor unit, and the temperature detection mechanism is used for detecting the air outlet temperature of the indoor unit.
The dual-system air conditioning unit further comprises a control device, and the control device can respectively control the first bypass pipeline, the second bypass pipeline, the third bypass pipeline, the fourth bypass pipeline, the first on-off mechanism and the second on-off mechanism to be communicated or closed according to a comparison result of the outlet air temperature and the target temperature.
The functional unit further comprises a compressor and an outdoor fan, the compressor is communicated with the corresponding communication port of the four-way valve, and the outdoor fan is arranged corresponding to the condenser.
The dual-system air conditioning unit further comprises a control device, and the control device can respectively control the first bypass pipeline, the second bypass pipeline, the third bypass pipeline, the fourth bypass pipeline, the first on-off mechanism and the second on-off mechanism to be communicated or closed according to the fault conditions of the functional units in the refrigerant circulating systems and the fault conditions.
The compressor comprises an inverter compressor; and/or the outdoor fan comprises a variable frequency fan.
A control method of the dual-system air conditioning unit comprises the following steps:
and acquiring the fault condition of each functional unit, and respectively controlling the first bypass pipeline, the second bypass pipeline, the third bypass pipeline, the fourth bypass pipeline, the first on-off mechanism and the second on-off mechanism to be communicated or closed according to the fault condition.
When all the functional units do not have fault conditions, the first bypass pipeline, the second bypass pipeline, the third bypass pipeline and the fourth bypass pipeline are all switched to a closed state, the first on-off mechanism and the second on-off mechanism are all switched to a communicated state, and the two refrigerant circulating systems operate relatively independently.
The functional unit further comprises a compressor, when one compressor and/or the four-way valve has a fault condition, the first on-off mechanism and the second on-off mechanism in the corresponding refrigerant circulating system are switched to a closed state, the first on-off mechanism and the second on-off mechanism in the other refrigerant circulating system are switched to a communicated state, the third bypass pipeline and the fourth bypass pipeline are switched to a communicated state, and the first bypass pipeline and the second bypass pipeline are switched to a closed state; or the second bypass pipeline and the fourth bypass pipeline are switched to a communicated state, and the first bypass pipeline and the third bypass pipeline are switched to a closed state.
When one of the outdoor fans and/or the condenser has a fault, the corresponding first on-off mechanism in the refrigerant circulation system is switched to a closed state and the corresponding second on-off mechanism in the refrigerant circulation system is switched to a communicated state, the first on-off mechanism and the second on-off mechanism in the other refrigerant circulation system are switched to a communicated state, the first bypass pipeline and the third bypass pipeline are switched to a communicated state, and the second bypass pipeline and the fourth bypass pipeline are switched to a closed state.
The compressor comprises an inverter compressor; and/or the outdoor fan comprises a variable frequency fan, and the control method further comprises the following steps:
acquiring indoor air outlet temperature Tc and set temperature Ts, and comparing the difference value delta T between the Ts-Tc and preset temperature;
if | Ts-Tc | > | DeltaT, the frequency of the compressor and/or the operating frequency of the outdoor fan are/is increased.
The control method further comprises the following steps: and if the comparison results in the preset time period are Ts-Tc > -Delta T, increasing the frequency of the compressor and/or the operating frequency of the fan.
According to the dual-system air conditioning unit and the control method thereof, when the dual-system air conditioning unit operates normally, the first bypass pipeline, the second bypass pipeline, the third bypass pipeline and the fourth bypass pipeline are not communicated; the two refrigerant circulating systems operate independently; when the functional unit of one refrigerant circulating system has an unrecoverable fault, other functional units in the refrigerant circulating system can participate in the refrigerating/heating process of another independent refrigerant circulating system, so that the reliable operation of the dual-system air conditioning unit is finally ensured, and the user experience is improved.
Drawings
Fig. 1 is a schematic structural diagram of a dual-system air conditioning unit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a normal heating mode of a dual-system air conditioning unit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a normal cooling mode of a dual-system air conditioning unit according to an embodiment of the present invention;
fig. 4 is a schematic structural view illustrating a first emergency heating mode of a dual-system air conditioning unit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram illustrating a first emergency cooling mode of a dual-system air conditioning unit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a second emergency heating mode of a dual-system air conditioning unit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a second emergency cooling mode of the dual-system air conditioning unit according to the embodiment of the present invention;
in the figure:
1. a four-way valve; 2. a first on-off mechanism; 3. a condenser; 4. a throttle mechanism; 5. an evaporator; 6. a first pipeline; 7. a second pipeline; 8. a third pipeline; 9. a second on-off mechanism; 10. a fourth pipeline; 11. a first bypass line; 12. a second bypass line; 13. a third bypass line; 14. a fourth bypass line; 15. an indoor unit; 16. a compressor; 17. an outdoor fan.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The dual-system air conditioning unit shown in fig. 1 to 7 includes two independent refrigerant circulation systems, each of the refrigerant circulation systems includes a plurality of functional units at least including a four-way valve 1, a first on-off mechanism 2, a condenser 3, a throttling mechanism 4 and an evaporator 5, the four-way valve 1 is communicated with the first on-off mechanism 2 through a first pipeline 6, the first on-off mechanism 2 is communicated with the condenser 3 through a second pipeline 7, the condenser 3 is communicated with the throttling mechanism 4 through a third pipeline 8, a second on-off mechanism 9 is arranged between the evaporator 5 and the four-way valve 1, the evaporator 5 is communicated with the second on-off mechanism 9 through a fourth pipeline 10, a first bypass pipeline 11 is connected between the two first pipelines 6, a second bypass pipeline 12 is connected between the two second pipelines 7, a third bypass pipeline 13 is connected between the two third pipelines 8, a fourth bypass pipeline 14 is connected between the two fourth pipelines 10, and the bypass pipelines 11, the second bypass pipeline 12, the third bypass pipeline 13 and the fourth bypass pipeline 14 are all communicated or closed by independent control.
When no functional unit in the dual-system air conditioning unit has a fault, the two independent refrigerant circulating systems operate independently; when a functional unit fails, the first bypass pipeline 11, the second bypass pipeline 12, the third bypass pipeline 13, the fourth bypass pipeline 14, the first on-off mechanism 2 and the second on-off mechanism 9 can be correspondingly controlled to adjust connection or close, so that other functional units of the refrigerant circulation system where the functional unit that fails is located can participate in another refrigerant circulation system to operate, thereby ensuring that the dual-system air conditioning unit can operate reliably, improving the utilization rate of the functional units, and improving user experience.
Specifically, the first bypass line 11, the second bypass line 12, the third bypass line 13, and the fourth bypass line 14 are respectively provided with a control valve, and the control valves may be controlled to be communicated or closed correspondingly, and may also be controlled to be in flow rate correspondingly.
In order to ensure that the evaporators 5 and/or the condensers 3 of the dual-system air conditioning unit can reliably operate in any operation mode, when the dual-system air conditioning unit is designed, the flow rate and/or the pressure of the refrigerant flowing to the two evaporators 5 are/is the same; and/or the flow rate and/or pressure of the refrigerant flowing to the two condensers 3 are the same. Specifically, the parameters such as the pipe diameters and the lengths of the first bypass line 11, the second bypass line 12, the third bypass line 13, and the fourth bypass line 14 may be designed.
The dual-system air conditioning unit further comprises an indoor unit 15, and the two evaporators 5 are arranged in the indoor unit 15 in parallel. The indoor heat exchange is carried out simultaneously through the two evaporators 5, and finally the indoor comfort is guaranteed.
The dual-system air conditioning unit further comprises a temperature detection mechanism, wherein the temperature detection mechanism is arranged at the position of the indoor unit 15 and is used for detecting the air outlet temperature of the indoor unit 15. The air outlet temperature of the indoor unit 15 is obtained to judge whether the dual-system air conditioning unit meets indoor requirements or not, particularly when the functional unit fails, and if the functional unit does not meet the indoor requirements, corresponding control is performed to meet the indoor requirements as much as possible. Specifically, for example, the operating frequency of the compressor and/or the operating frequency of the fan are increased.
The dual-system air conditioning unit further comprises a control device, and the control device can respectively control the first bypass pipeline 11, the second bypass pipeline 12, the third bypass pipeline 13, the fourth bypass pipeline 14, the first on-off mechanism 2 and the second on-off mechanism 9 to be communicated or closed according to a comparison result of the outlet air temperature and the target temperature. When the control device judges that the current operation mode is possibly dangerous, the control device switches the dual-system air conditioning unit to a reliable operation mode to avoid danger.
The functional unit further comprises a compressor 16 and an outdoor fan 17, the compressor 16 is communicated with a corresponding communication port of the four-way valve 1, and the outdoor fan 17 is arranged corresponding to the condenser 3. Each refrigerant circulating system is provided with a compressor 16, the compressor 16 can ensure the normal independent operation of the refrigerant circulating system, each condenser 3 is correspondingly provided with an outdoor fan 17, when the refrigerant flows through the condenser 3, the outdoor fan 17 corresponding to the condenser 3 also works synchronously, and when no refrigerant flows through the condenser 3, the outdoor fan 17 corresponding to the condenser 3 also stops synchronously.
Wherein, still be provided with compressor 16 exhaust temperature detection mechanism and pressure detection temperature in the dual-system air conditioning unit, guarantee the operation of dual-system air conditioning unit reliable through the exhaust temperature and the pressure that detect compressor 16.
The dual-system air conditioning unit further comprises a control device, and the control device can respectively control the first bypass pipeline 11, the second bypass pipeline 12, the third bypass pipeline 13, the fourth bypass pipeline 14, the first on-off mechanism 2 and the second on-off mechanism 9 to be communicated or closed according to the fault condition of each functional unit in each refrigerant circulating system and the fault condition. The dual-system air conditioning unit can judge whether the functional unit has a fault condition according to the condition of control device or manual input, and then the control device can adjust according to the obtained fault condition, so that the dual-system air conditioning unit can be switched to a proper working state to work, and the requirements of users are met.
The compressor 16 comprises an inverter compressor, and the inverter compressor can adjust the operating frequency thereof according to the requirement of the dual-system air conditioning unit so as to meet the requirement of a user.
Similarly, the outdoor fan 17 includes a variable frequency fan, and the variable frequency fan can adjust the operating frequency of the variable frequency fan according to the requirement of the dual-system air conditioning unit to meet the requirement of the user.
A control method of the dual-system air conditioning unit comprises the following steps:
acquiring the fault conditions of each functional unit, and respectively controlling the first bypass pipeline 11, the second bypass pipeline 12, the third bypass pipeline 13, the fourth bypass pipeline 14, the first on-off mechanism 2 and the second on-off mechanism 9 to be communicated or closed according to the fault conditions.
When all the functional units do not have fault conditions, the first bypass pipeline 11, the second bypass pipeline 12, the third bypass pipeline 13 and the fourth bypass pipeline 14 are all switched to a closed state, the first on-off mechanism 2 and the second on-off mechanism 9 are all switched to a communicated state, and the two refrigerant circulation systems operate relatively independently.
When all the functional units have no fault condition, the dual-system air conditioning unit has a normal cooling mode and a normal heating mode.
Specifically, as shown in fig. 2, in the normal heating mode, the two sets of refrigerant circulation systems both perform independent refrigeration cycles, and in each set of refrigerant circulation system, the refrigerant discharged from the compressor 16 sequentially passes through the four-way valve 1, the second on-off mechanism 9, the evaporator 5, the throttling mechanism 4, the condenser 3, and the first on-off mechanism 2, and then flows back into the compressor 16 through the four-way valve 1 to complete the heating cycle. The refrigerants in the two refrigerant circulating systems do not circulate mutually.
As shown in fig. 3, in the normal cooling mode, the two sets of refrigerant circulation systems both perform independent cooling cycles, and in each set of refrigerant circulation system, the refrigerant discharged from the compressor 16 sequentially passes through the four-way valve 1, the first on-off mechanism 2, the condenser 3, the throttling mechanism 4, the evaporator 5, and the second on-off mechanism 9, and then flows back into the compressor 16 through the four-way valve 1 to complete the cooling cycle. The refrigerants in the two refrigerant circulating systems do not circulate mutually.
The functional units further include compressors 16, when one of the compressors 16 and/or the four-way valve 1 has a fault, the first on-off mechanism 2 and the second on-off mechanism 9 in the corresponding refrigerant circulation system are switched to a closed state, the first on-off mechanism 2 and the second on-off mechanism 9 in the other refrigerant circulation system are switched to a communicated state, the third bypass pipeline 13 and the fourth bypass pipeline 14 are switched to a communicated state, and the first bypass pipeline 11 and the second bypass pipeline 12 are switched to a closed state; alternatively, the second bypass line 12 and the fourth bypass line 14 are switched to the connected state, and the first bypass line 11 and the third bypass line 13 are switched to the closed state. When the compressor 16 and/or the four-way valve 1 have a fault, the condenser 3 and the evaporator 5 in the corresponding refrigerant circulating system do not have faults and can be used, and at the moment, the refrigerant can be selected to flow according to needs to participate in the heat exchange of the dual-system air conditioning unit, so that the utilization rate of the functional unit is improved, and the user experience is improved.
When a fault condition exists in one compressor 16 and/or the four-way valve 1, the dual-system air conditioning unit has a first emergency cooling mode and a first emergency heating mode.
Specifically, as shown in fig. 5, in the first emergency cooling mode, for example, when all functional units in the first refrigerant circulation system are working normally, and the compressor 16 and/or the four-way valve 1 in the second refrigerant circulation system have a failure, the exhaust air of the compressor 16 in the first refrigerant circulation system is divided into two parts after flowing through the four-way valve 1, a part of the refrigerant flows through the first on-off mechanism 2 in the first refrigerant circulation system, the condenser 3 in the first refrigerant circulation system, the throttling mechanism 4 in the first refrigerant circulation system, the evaporator 5 in the first refrigerant circulation system, and the second on-off mechanism 9 in the first refrigerant circulation system in sequence and then flows back to the compressor 16 through the four-way valve 1, and the other part of the refrigerant flows through the first on-off mechanism 2 in the first refrigerant circulation system, the third bypass pipeline 13, the condenser 3 in the second refrigerant circulation system, the throttling mechanism 4 in the second refrigerant circulation system, the evaporator 5 in the second refrigerant circulation system, and the fourth bypass pipeline 14 in sequence and then flows back to the compressor 16 through the four-way valve 1 in the first refrigerant circulation system, thereby completing the refrigeration cycle of the dual-system air conditioning unit.
Similarly, as shown in fig. 4, in the first emergency heating mode, for example, when all functional units in the first refrigerant circulation system are working normally, and the compressor 16 and/or the four-way valve 1 in the second refrigerant circulation system have a failure, the exhaust air of the compressor 16 in the first refrigerant circulation system is divided into two parts after flowing through the four-way valve 1, a part of the refrigerant flows through the second on-off mechanism 9 in the first refrigerant circulation system, the evaporator 5 in the first refrigerant circulation system, the throttling mechanism 4 in the first refrigerant circulation system, the condenser 3 in the first refrigerant circulation system and the first on-off mechanism 2 in the first refrigerant circulation system in sequence, and then flows back to the compressor 16 through the four-way valve 1 in the first refrigerant circulation system, and the other part flows through the fourth bypass pipeline 14, the evaporator 5 in the second refrigerant circulation system, the throttling mechanism 4 in the second refrigerant circulation system, the second bypass pipeline 12 and the condenser 3 in the first refrigerant circulation system in sequence, and then flows back to the compressor 16 through the four-way valve 1 in the first refrigerant circulation system, thereby completing the heating cycle of the dual-system air conditioning unit.
Or, in the first emergency heating mode, taking the case that all functional units in the first refrigerant circulation system are working normally, and the compressor 16 and/or the four-way valve 1 in the second refrigerant circulation system have a fault, for example, the exhaust gas of the compressor 16 in the first refrigerant circulation system is divided into two parts after flowing through the four-way valve 1, one part of the refrigerant flows through the second on-off mechanism 9 in the first refrigerant circulation system, the evaporator 5 in the first refrigerant circulation system, the throttling mechanism 4 in the first refrigerant circulation system, the condenser 3 in the first refrigerant circulation system and the first on-off mechanism 2 in the first refrigerant circulation system in sequence, and then flows back to the compressor 16 through the four-way valve 1 in the first refrigerant circulation system, and the other part of the refrigerant flows through the fourth bypass pipeline 14, the evaporator 5 in the second refrigerant circulation system, the throttling mechanism 4 in the second refrigerant circulation system, the condenser 3 in the second refrigerant circulation system and the third bypass pipeline 13 in sequence, and then flows back to the compressor 16 through the four-way valve 1 in the first refrigerant circulation system, thereby completing the heating cycle of the dual-system air conditioning unit.
The functional unit further comprises an outdoor fan 17, when one outdoor fan 17 and/or the condenser 3 has a fault, the corresponding first on-off mechanism 2 in the refrigerant circulation system is switched to a closed state and the corresponding second on-off mechanism 9 is switched to a communicated state, the other first on-off mechanism 2 and the corresponding second on-off mechanism 9 in the refrigerant circulation system are switched to a communicated state, the first bypass pipeline 11 and the third bypass pipeline 13 are switched to a communicated state, and the second bypass pipeline 12 and the fourth bypass pipeline 14 are switched to a closed state. When the outdoor fan 17 and/or the condenser 3 have a fault, the compressor 16 and the evaporator 5 in the corresponding refrigerant circulating system do not have a fault and can be used, and at the moment, the refrigerant can be selected to flow according to needs to participate in the heat exchange of the dual-system air conditioning unit, so that the utilization rate of the functional unit is improved, and the user experience is improved.
When one of the outdoor fans 17 and/or the condenser 3 has a failure, the dual system air conditioning unit has a second emergency cooling mode and a second emergency heating mode.
Specifically, as shown in fig. 7, in the second emergency cooling mode, for example, when all functional units in the first refrigerant circulation system are working normally, and the compressor 16 and/or the four-way valve 1 in the second refrigerant circulation system have a failure, the exhaust gas of the compressor 16 in the first refrigerant circulation system flows to the first on-off mechanism 2 in the first refrigerant circulation system through the four-way valve 1 in the first refrigerant circulation system, the exhaust gas of the same compressor 16 in the second refrigerant circulation system flows to the first on-off mechanism 2 through the four-way valve 1 and the first bypass pipeline 11 in the second refrigerant circulation system, the exhaust gases of the two compressors 16 are merged before the first on-off mechanism 2 and are divided into two parts after passing through the first on-off mechanism 2 and the condenser 3 in the first refrigerant circulation system, one part of the refrigerants sequentially flow through the throttling mechanism 4 in the first refrigerant circulation system, the evaporator 5 in the first refrigerant circulation system, the second on-off mechanism 9 in the first refrigerant circulation system, and then flow back to the compressor 16 in the first refrigerant circulation system through the four-way valve 1 in the second refrigerant circulation system, and the other part of the second refrigerant circulation system sequentially flows through the four-way valve 1 in the second refrigerant circulation system, and flows back to the evaporator 4 in the second refrigerant circulation system through the second refrigerant circulation system, and the evaporator 4 in the second refrigerant circulation system, and the refrigerant circulation system.
As shown in fig. 6, in the second emergency heating mode, taking as an example that all functional units in the first refrigerant circulation system are working normally, and the compressor 16 and/or the four-way valve 1 in the second refrigerant circulation system have a failure, the exhaust gas of the compressor 16 in the first refrigerant circulation system passes through the four-way valve 1 in the first refrigerant circulation system, then flows through the second cut-off mechanism 9 in the first refrigerant circulation system, the evaporator 5 in the first refrigerant circulation system, and the throttling mechanism 4 in the first refrigerant circulation system in sequence, and then flows into the condenser 3 in the first refrigerant circulation system, the exhaust gas of the compressor 16 in the second refrigerant circulation system passes through the four-way valve 1 in the second refrigerant circulation system, then flows through the second cut-off mechanism 9 in the second refrigerant circulation system, the evaporator 5 in the second refrigerant circulation system, the throttling mechanism 4 in the second refrigerant circulation system, and the third pipeline 13 in the first refrigerant circulation system in sequence, and then flows into the condenser 3 in the first refrigerant circulation system, two parts are merged and then flow through the condenser 3 in the first refrigerant circulation system and the first cut-off mechanism 2 in the first refrigerant circulation system, then flow back to the compressor 16 in the second refrigerant circulation system through the four-way, and the bypass refrigerant circulation system, and the four-way valve 1 in the compressor 11 in the first refrigerant circulation system, and then flow back to the two parts of the bypass refrigerant circulation system.
As an embodiment not shown, the dual-system air conditioning unit may short-circuit the functional unit with failure information through the first bypass line 11, the second bypass line 12, the third bypass line 13, and the fourth bypass line 14, and the first on-off mechanism 2 and the second on-off mechanism 9, while other functional units without failure information selectively participate in the operation of the dual-system air conditioning unit, including but not limited to the functional elements of the throttling mechanism 4, the filter, the gas-liquid separator, and the like.
Optionally, the compressor 16 comprises an inverter compressor; and/or, the outdoor fan 17 comprises a variable frequency fan, and the control method further comprises: acquiring indoor air outlet temperature Tc and set temperature Ts, and comparing the difference value delta T between the Ts-Tc and preset temperature; if | Ts-Tc | > | DeltaT, the frequency of the compressor 16 and/or the operating frequency of the outdoor fan 17 is increased.
When the dual-system air conditioning unit is in any one of the first emergency cooling mode, the first emergency heating mode, the second emergency cooling mode or the second emergency heating mode, if the difference between the set temperature and the outlet air temperature is greater than the preset temperature difference, it indicates that the heat exchange amount of the dual-system air conditioning unit at the moment cannot meet the set requirement, and the operating frequency of the compressor 16 and/or the operating frequency of the outdoor fan 17 need to be increased to improve the heat exchange amount, so as to meet the requirement of a user.
Wherein the preset temperature difference value ranges from 2 ℃ to 6 ℃, and is preferably 4 ℃.
In order to avoid frequent adjustment of the compressor 16 and/or the outdoor fan 17 by the dual-system air-conditioning unit and also avoid mis-adjustment of the compressor 16 and/or the outdoor fan 17 by the dual-system air-conditioning unit, the control method further comprises: if the comparison results within the predetermined time period are all | Ts-Tc | >. Δ T, the frequency of the compressor 16 and/or the operating frequency of the fan is increased. That is, when the comparison result of | Ts-Tc | > | Δ T is established within the preset time period, it indicates that the dual-system air conditioning unit at this time cannot meet the indoor heat exchange amount requirement, and the operation frequency of the compressor 16 and/or the fan needs to be adjusted.
Wherein, the numerical range of the preset time period is 1min to 5min, preferably 3min.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (14)
1. The utility model provides a dual system air conditioning unit which characterized in that: comprises two independent refrigerant circulating systems, each refrigerant circulating system is provided with a plurality of functional units at least comprising a four-way valve (1), a first on-off mechanism (2), a condenser (3), a throttling mechanism (4) and an evaporator (5), the four-way valve (1) is communicated with the first on-off mechanism (2) through a first pipeline (6), the first on-off mechanism (2) is communicated with the condenser (3) through a second pipeline (7), the condenser (3) is communicated with the throttling mechanism (4) through a third pipeline (8), a second on-off mechanism (9) is arranged between the evaporator (5) and the four-way valve (1), the evaporator (5) is communicated with the second cut-off mechanism (9) through a fourth pipeline (10), a first bypass pipeline (11) is connected between the two first pipelines (6), a second bypass pipeline (12) is connected between the two second pipelines (7), a third bypass pipeline (13) is connected between the two third pipelines (8), a fourth bypass pipeline (14) is connected between the two fourth pipelines (10), and the first bypass pipeline (11), the second bypass pipeline (12), the third bypass pipeline (13) and the fourth bypass pipeline (14) are communicated or closed in an independent control mode.
2. The dual system air conditioning unit as recited in claim 1 wherein: the flow rate and/or pressure of the refrigerant flowing to the two evaporators (5) are the same; and/or the flow rate and/or the pressure of the refrigerant flowing to the two condensers (3) are the same.
3. The dual system air conditioning unit of claim 2, wherein: the dual-system air conditioning unit further comprises an indoor unit (15), and the two evaporators (5) are arranged in the indoor unit (15) in parallel.
4. A dual system air conditioning unit as set forth in claim 3 wherein: the dual-system air conditioning unit further comprises a temperature detection mechanism, the temperature detection mechanism is arranged at the indoor unit (15), and the temperature detection mechanism is used for detecting the air outlet temperature of the indoor unit (15).
5. The dual system air conditioning unit of claim 4, wherein: the dual-system air conditioning unit further comprises a control device, and the control device can respectively control the first bypass pipeline (11), the second bypass pipeline (12), the third bypass pipeline (13), the fourth bypass pipeline (14), the first on-off mechanism (2) and the second on-off mechanism (9) to be communicated or closed according to a comparison result of the outlet air temperature and the target temperature.
6. The dual system air conditioning unit as recited in claim 1 wherein: the functional unit further comprises a compressor (16) and an outdoor fan (17), the compressor (16) is communicated with a corresponding communication port of the four-way valve (1), and the outdoor fan (17) is arranged corresponding to the condenser (3).
7. The dual system air conditioning unit of claim 6, wherein: the dual-system air conditioning unit further comprises a control device, wherein the control device can respectively control the first bypass pipeline (11), the second bypass pipeline (12), the third bypass pipeline (13), the fourth bypass pipeline (14), the first on-off mechanism (2) and the second on-off mechanism (9) to be communicated or closed according to fault conditions of all functional units in each refrigerant circulating system and according to the fault conditions.
8. The dual system air conditioning unit of claim 6, wherein: the compressor (16) comprises an inverter compressor; and/or the outdoor fan (17) comprises a variable frequency fan.
9. A control method of a dual system air conditioning unit according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:
and acquiring the fault conditions of each functional unit, and respectively controlling the first bypass pipeline (11), the second bypass pipeline (12), the third bypass pipeline (13), the fourth bypass pipeline (14), the first on-off mechanism (2) and the second on-off mechanism (9) to be communicated or closed according to the fault conditions.
10. The control method according to claim 9, characterized in that: when all the functional units do not have fault conditions, the first bypass pipeline (11), the second bypass pipeline (12), the third bypass pipeline (13) and the fourth bypass pipeline (14) are all switched to a closed state, the first on-off mechanism (2) and the second on-off mechanism (9) are all switched to a communicated state, and the two refrigerant circulation systems operate independently.
11. The control method according to claim 9, characterized in that: the functional unit further comprises a compressor (16), when one compressor (16) and/or the four-way valve (1) has a fault condition, the first on-off mechanism (2) and the second on-off mechanism (9) in the corresponding refrigerant circulating system are switched to a closed state, the first on-off mechanism (2) and the second on-off mechanism (9) in the other refrigerant circulating system are switched to a communicated state, the third bypass pipeline (13) and the fourth bypass pipeline (14) are switched to a communicated state, and the first bypass pipeline (11) and the second bypass pipeline (12) are switched to a closed state; or the second bypass line (12) and the fourth bypass line (14) are switched to a communicating state, and the first bypass line (11) and the third bypass line (13) are switched to a closed state.
12. The control method according to claim 9, characterized in that: the functional unit further comprises outdoor fans (17), when one outdoor fan (17) and/or the condenser (3) has a fault condition, the corresponding first on-off mechanism (2) in the refrigerant circulating system is switched to a closed state and the corresponding second on-off mechanism (9) is switched to a communicated state, the other first on-off mechanism (2) and the corresponding second on-off mechanism (9) in the refrigerant circulating system are switched to a communicated state, the first bypass pipeline (11) and the third bypass pipeline (13) are switched to a communicated state, and the second bypass pipeline (12) and the fourth bypass pipeline (14) are switched to a closed state.
13. The control method according to claim 11 or 12, characterized in that: the control method further comprises the following steps:
acquiring indoor air outlet temperature Tc and set temperature Ts, and comparing the difference value delta T between the Ts-Tc and preset temperature;
if | Ts-Tc | > | DeltaT, the frequency of the compressor (16) and/or the operating frequency of the outdoor fan (17) is increased.
14. The control method according to claim 13, characterized in that: further comprising:
if the comparison results in the preset time period are all | Ts-Tc | > [ Delta ] T, the frequency of the compressor (16) and/or the operating frequency of the fan are/is increased.
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| CN202210801579.6A CN115183348A (en) | 2022-07-08 | 2022-07-08 | Dual-system air conditioning unit and control method thereof |
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