CN116753611A - Air conditioning system, control method, device and medium for outlet pressure of evaporator - Google Patents
Air conditioning system, control method, device and medium for outlet pressure of evaporator Download PDFInfo
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- CN116753611A CN116753611A CN202310716052.8A CN202310716052A CN116753611A CN 116753611 A CN116753611 A CN 116753611A CN 202310716052 A CN202310716052 A CN 202310716052A CN 116753611 A CN116753611 A CN 116753611A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004378 air conditioning Methods 0.000 title claims abstract description 38
- 239000007788 liquid Substances 0.000 claims description 57
- 239000003507 refrigerant Substances 0.000 claims description 46
- 238000001704 evaporation Methods 0.000 claims description 16
- 230000008020 evaporation Effects 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 8
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 description 19
- 230000008569 process Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 238000004590 computer program Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
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- 239000010725 compressor oil Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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Classifications
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
-
- 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
-
- 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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioning system, a method, a device and a medium for controlling outlet pressure of an evaporator. The system comprises: the controller is respectively connected with the electronic expansion valve, the evaporator outlet pressure sensor, the pulse electromagnetic valve, the first electronic back pressure valve and the second electronic back pressure valve, and is used for acquiring a first outlet pressure value of the evaporator through the evaporator outlet pressure sensor and controlling the first outlet pressure value to be equal to a first preset target value through adjusting valve steps of the electronic expansion valve, the pulse electromagnetic valve, the first electronic back pressure valve and the second electronic back pressure valve. According to the technical scheme, the outlet pressure value of the evaporator is directly used as a parameter adjustment index, and the control device consisting of the electronic expansion valve, the pulse electromagnetic valve, the first electronic back pressure valve and the second electronic back pressure valve is used, so that the adjusting range of the outlet pressure control of the evaporator can be enlarged, and the adjusting precision can be improved.
Description
Technical Field
The present invention relates to the field of air conditioning technologies, and in particular, to a method, an apparatus, and a medium for controlling outlet pressure of an air conditioning system and an evaporator.
Background
With the continuous improvement of the requirements of customers on air-conditioning products, the heat exchange effect of the air-conditioning products under different evaporating pressures needs to be verified. Therefore, how to realize a large adjustment range and high-precision evaporator outlet pressure control is becoming one of the important research directions at present.
At present, in the existing evaporator outlet pressure control method, a mechanical evaporation pressure adjusting valve is generally adopted, and the evaporator outlet refrigerant pressure is not directly used as an accurate control index. However, in the prior art, after a certain pressure protection value is set before leaving the factory, adjustment is basically not performed, and the problems of narrow adjustment range, poor adjustment precision and the like exist.
Disclosure of Invention
The invention provides an air conditioning system, a method, a device and a medium for controlling the outlet pressure of an evaporator, which can enlarge the adjusting range of the outlet pressure control of the evaporator and improve the adjusting precision.
According to an aspect of the present invention, there is provided an air conditioning system including an electronic expansion valve, an evaporator outlet pressure sensor, a pulse solenoid valve, a first electronic back pressure valve, a second electronic back pressure valve, and a controller;
the electronic expansion valve is connected with the input end of the evaporator, the evaporator outlet pressure sensor and the second electronic back pressure valve are connected with the output end of the evaporator, the first electronic back pressure valve is connected with the output end of the evaporator through the pulse electromagnetic valve, and the second electronic back pressure valve is connected with the first electronic back pressure valve and the pulse electromagnetic valve in parallel;
The controller is respectively connected with the electronic expansion valve, the evaporator outlet pressure sensor, the pulse electromagnetic valve, the first electronic back pressure valve and the second electronic back pressure valve, and is used for acquiring a first outlet pressure value of the evaporator through the evaporator outlet pressure sensor and controlling the first outlet pressure value to be equal to a first preset target value through adjusting valve steps of the electronic expansion valve, the pulse electromagnetic valve, the first electronic back pressure valve and the second electronic back pressure valve.
Optionally, the air conditioning system further comprises a variable frequency compressor, a condenser, a variable frequency condensing fan and a condenser outlet pressure sensor, wherein the output end of the variable frequency compressor is connected with the electronic expansion valve through the condenser, and the forced condenser is circulated to improve the heat dissipation capacity of the condenser;
the condenser outlet pressure sensor is respectively connected with the output end of the condenser and the controller, and is used for acquiring a second outlet pressure value of the condenser and sending the second outlet pressure value to the controller;
the controller is respectively connected with the variable frequency condensing fan and the variable frequency compressor, and is further used for controlling the pressure difference between the first outlet pressure value of the evaporator and the first preset target value to be within a first preset deviation range by adjusting the first frequency of the variable frequency compressor, and controlling the pressure difference between the second outlet pressure value and the second preset target value to be within a second preset deviation range by adjusting the second frequency of the variable frequency condensing fan.
Optionally, the air conditioning system further comprises a liquid storage device, a drying filter, a liquid viewing mirror, an electromagnetic valve and a gas-liquid separator; one end of the liquid storage device is connected with the output end of the condenser, and the other end of the liquid storage device is connected with the electronic expansion valve through the drying filter, the liquid viewing mirror and the electromagnetic valve; one end of the gas-liquid separator is connected with the first electronic back pressure valve and the second electronic back pressure valve, and the other end of the gas-liquid separator is connected with the input end of the variable frequency compressor;
the liquid accumulator is used for storing liquid components in the refrigerant output by the condenser;
the drying filter is used for absorbing moisture in the refrigerant passing through the liquid reservoir;
the liquid viewing mirror is used for displaying the liquid level of the refrigerant;
the electromagnetic valve is used for allowing or limiting the flow of the refrigerant according to the on-off condition;
the gas-liquid separator is used for containing liquid components in the refrigerants output by the first electronic back pressure valve and the second electronic back pressure valve.
Optionally, the air conditioning system further comprises an evaporation fan, and an air channel of the evaporation fan passes through the evaporator;
the evaporation fan is used for transmitting the cold energy emitted by the refrigerant in the evaporator to the air.
According to another aspect of the present invention, there is provided a method for controlling outlet pressure of an evaporator, which is applied to a controller in an air conditioning system according to any embodiment of the present invention, including:
acquiring a first outlet pressure value of the evaporator through an outlet pressure sensor of the evaporator;
if the pressure difference between the first outlet pressure value and a first preset target value is detected to be within a first preset deviation range, when the first outlet pressure value is detected to be larger than the first preset target value and the valve step of the electronic expansion valve is detected to be in a preset non-dead zone, the valve step of the electronic expansion valve is adjusted so that the first outlet pressure value is equal to the first preset target value;
and if the first outlet pressure value is detected to be smaller than the first preset target value and the valve step of the pulse electromagnetic valve, the first electronic back pressure valve or the second electronic back pressure valve is in a preset non-dead zone, adjusting the valve step of the pulse electromagnetic valve, the first electronic back pressure valve or the second electronic back pressure valve so that the first outlet pressure value is equal to the first preset target value.
According to another aspect of the present invention, there is provided a control device for outlet pressure of an evaporator, which is applied to a controller in an air conditioning system according to any embodiment of the present invention, including:
The evaporator pressure value acquisition module is used for acquiring a first outlet pressure value of the evaporator through the evaporator outlet pressure sensor;
the first valve step adjusting module is used for adjusting the valve step of the electronic expansion valve to enable the first outlet pressure value to be equal to a first preset target value when the first outlet pressure value is detected to be larger than the first preset target value and the valve step of the electronic expansion valve is in a preset non-dead zone if the pressure difference value between the first outlet pressure value and the first preset target value is detected to be within a first preset deviation range;
and the second valve step adjusting module is used for adjusting the valve steps of the pulse electromagnetic valve, the first electronic back pressure valve or the second electronic back pressure valve to enable the first outlet pressure value to be equal to the first preset target value if the first outlet pressure value is detected to be smaller than the first preset target value and the valve steps of the pulse electromagnetic valve, the first electronic back pressure valve or the second electronic back pressure valve are in a preset non-dead zone.
According to another aspect of the present invention, there is provided a computer readable storage medium storing computer instructions for causing a processor to execute a method of controlling outlet pressure of an evaporator according to any one of the embodiments of the present invention.
According to the technical scheme, the controller obtains a first outlet pressure value of the evaporator through the outlet pressure sensor of the evaporator, and controls the first outlet pressure value to be equal to a first preset target value by adjusting valve steps of the electronic expansion valve, the pulse electromagnetic valve, the first electronic back pressure valve and the second electronic back pressure valve; the outlet pressure value of the evaporator is directly used as a parameter adjustment index, and the control device consisting of the electronic expansion valve, the pulse electromagnetic valve, the first electronic back pressure valve and the second electronic back pressure valve is used, so that the adjusting range of the outlet pressure control of the evaporator can be enlarged, and the adjusting precision can be improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1A is a schematic structural diagram of an air conditioning system according to a first embodiment of the present invention;
fig. 1B is a schematic structural diagram of another air conditioning system according to a first embodiment of the present invention;
fig. 1C is a schematic structural diagram of another air conditioning system according to a first embodiment of the present invention;
fig. 1D is a schematic structural diagram of another air conditioning system according to a first embodiment of the present invention;
fig. 1E is a schematic structural diagram of another air conditioning system according to a first embodiment of the present invention;
FIG. 2 is a flow chart of a method for controlling outlet pressure of an evaporator according to a second embodiment of the invention;
fig. 3 is a schematic structural diagram of an evaporator outlet pressure control apparatus according to a third embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," "target," and the like in the description and claims of the present invention and in the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1A is a schematic structural diagram of an air conditioning system according to an embodiment of the present invention, where the air conditioning system 100 may include an electronic expansion valve 101, an evaporator 102, an evaporator outlet pressure sensor 103, a pulse electromagnetic valve 104, a first electronic back pressure valve 105, a second electronic back pressure valve 106, and a controller 107.
The electronic expansion valve 101 is connected with the input end of the evaporator 102, the evaporator outlet pressure sensor 103 and the second electronic back pressure valve 106 are connected with the output end of the evaporator 102, the first electronic back pressure valve 105 is connected with the output end of the evaporator 102 through the pulse electromagnetic valve 104, and the second electronic back pressure valve 106 is connected with the first electronic back pressure valve 105 and the pulse electromagnetic valve 104 in parallel. Wherein the first electronic back pressure valve 105 is connected in series with the pulsing solenoid valve 104, the series shunt being connected in parallel with the second electronic back pressure valve 106.
In the present embodiment, the refrigerant passes through the electronic expansion valve 101 and enters the evaporator 102, and after flowing out from the evaporator 102, enters the branch where the first electronic back pressure valve 105 and the pulse solenoid valve 104 are connected in series, and the branch where the second electronic back pressure valve 106 is located, respectively. It will be appreciated that the air conditioning system 100 may also include other conventional components, such as a compressor, condenser, etc., that may form a closed loop circuit for the refrigerant that completes the refrigeration cycle by flowing in the closed loop circuit.
The controller 107 is respectively connected to the electronic expansion valve 101, the evaporator outlet pressure sensor 103, the pulse electromagnetic valve 104, the first electronic back pressure valve 105 and the second electronic back pressure valve 106, and is configured to obtain a first outlet pressure value of the evaporator 102 through the evaporator outlet pressure sensor 103, and control the first outlet pressure value to be equal to a first preset target value by adjusting valve steps of the electronic expansion valve 101, the pulse electromagnetic valve 104, the first electronic back pressure valve 105 and the second electronic back pressure valve 106.
The evaporator outlet pressure sensor 103 is disposed at an output end of the evaporator 102, and is used for monitoring the pressure of the refrigerant at the outlet of the evaporator 102 in real time, and sending the detected pressure value to the controller 107. The controller 107 may be a functional module having data processing capabilities, such as a central processing unit or the like. In the present embodiment, the type of the pressure sensor is not particularly limited.
In this embodiment, the controller 107 may be connected to each device by a wired connection or a wireless connection. Typically, the controller 107 may implement valve step control of each valve by sending a controller signal to each valve. Wherein, the valve step can be the opening degree of each valve; typically, in the initial state, the valves may be defaulted to a fully open state.
The electronic expansion valve 101 is configured to control the injection of liquid refrigerant from the condenser 109 to the evaporator 102, and when the refrigerant passes through the electronic expansion valve 101, isenthalpic pressure reduction can be achieved, and control of the refrigerant flow can be achieved according to a controller signal. By using the electronic expansion valve 101, the superheat at the outlet of the evaporator 102 can be maintained at a level that prevents liquid refrigerant from leaving the evaporator 102 to enter the compressor. The evaporator 102 is a device for evaporating the low-pressure low-temperature gas-liquid mixture refrigerant throttled by the electronic expansion valve 101 into low-pressure medium-temperature gas, and the evaporator 102 absorbs heat in the evaporation process, so that the refrigerant liquid is evaporated into the refrigerant gas. The pulse solenoid valve 104 can be cycled rapidly and periodically in a short period of time to maintain a very close temperature for achieving refrigerant flow regulation with substantially constant pressure. An electronic back pressure valve for rapidly regulating the refrigerant pressure when environmental or system conditions change.
In a specific example, when the controller 107 detects that the first outlet pressure value of the evaporator 102 is not equal to the preset target pressure value, the valve steps of each valve may be adjusted according to a preset adjustment rule, so as to adjust the first outlet pressure value to be equal to the preset target value finally. For example, if it is detected that the first outlet pressure value is greater than the first preset target value, the valve step of the electronic expansion valve 101 may be adjusted based on PID (Proportion, integral and Differential) algorithms to reduce the flow rate of the refrigerant into the evaporator 102, thereby reducing the first outlet pressure value to be equal to the preset target value; alternatively, if it is detected that the first outlet pressure value is smaller than the first preset target value, the valve steps may be sequentially decreased in order of the second electronic back pressure valve 106, the first electronic back pressure valve 105, and the pulse solenoid valve 104 based on the PID algorithm so that the first outlet pressure value is equal to the first preset target value.
According to the technical scheme, the controller obtains a first outlet pressure value of the evaporator through the outlet pressure sensor of the evaporator, and controls the first outlet pressure value to be equal to a first preset target value by adjusting valve steps of the electronic expansion valve, the pulse electromagnetic valve, the first electronic back pressure valve and the second electronic back pressure valve; the outlet pressure value of the evaporator is directly used as a parameter adjustment index, and the control device consisting of the electronic expansion valve, the pulse electromagnetic valve, the first electronic back pressure valve and the second electronic back pressure valve is used, so that the adjusting range of the outlet pressure control of the evaporator can be enlarged, and the adjusting precision can be improved.
Optionally, as shown in fig. 1B, the air conditioning system 100 may further include a variable frequency compressor 108, a condenser 109, a variable frequency condensing fan 110, and a condenser outlet pressure sensor 111, where an output end of the variable frequency compressor 108 is connected to the electronic expansion valve 101 through the condenser 109, and the variable frequency condensing fan 110 forces the condenser 109 to circulate air to increase the heat dissipation capacity of the condenser 109;
the condenser outlet pressure sensor 111 is connected to the output end of the condenser 109 and the controller 107, and is configured to obtain a second outlet pressure value of the condenser 109, and send the second outlet pressure value to the controller 107;
the controller 107 is connected to the variable frequency condensing fan 110 and the variable frequency compressor 108, and is further configured to control a pressure difference between a first outlet pressure value of the evaporator 102 and the first preset target value to be within a first preset deviation range by adjusting a first frequency of the variable frequency condensing fan 110 and to control a pressure difference between a second outlet pressure value and a second preset target value to be within a second preset deviation range by adjusting a second frequency of the variable frequency condensing fan 110.
The inverter compressor 108 is a power core of the air conditioning system 100, and can compress the sucked low-temperature low-pressure refrigerant vapor into high-pressure high-temperature superheated vapor to create condensing conditions at a higher temperature, and can convey and push the refrigerant to flow in the system to complete refrigeration cycle, so that the purpose of refrigeration can be achieved through heat-power conversion. Secondly, by adopting the frequency conversion effect (changing the power supply frequency), different heating powers of customers and the requirements of customers on response time can be responded rapidly, the air conditioning system 100 can reach the required running state and boundary conditions in a short time, and meanwhile, the energy-saving advantage is achieved.
A condenser 109 for condensing the high-pressure high-temperature refrigerant vapor sent from the inverter compressor 108 into a high-pressure high-temperature liquid. The condensation process is a heat dissipation process, so the condenser 109 is a device that condenses refrigerant vapor into refrigerant liquid. A variable frequency condensing fan 110 for transferring heat dissipated from the refrigerant in the condenser 109 to the air through the fan to maintain the condensing temperature and condensing pressure within reasonable ranges. In this embodiment, by adjusting the power frequency of the variable frequency condensing fan 110, the fan speed can be controlled, so that the control of the outlet pressure value of the condenser 109 can be achieved.
A precondition for controlling the outlet pressure value of the evaporator 102 to be stable is that the outlet pressure value of the condenser 109 is stable and cannot fluctuate widely. In this embodiment, the controller 107 may perform variable frequency adjustment on the variable frequency condensing fan 110 according to a second preset target value based on a PID algorithm, that is, adjust the second frequency (power frequency) of the variable frequency condensing fan 110, so as to ensure that the pressure difference between the second outlet pressure value and the second preset target value is always kept within a second preset deviation range. The preset deviation range may be a preset deviation range of pressure values, for example [ -a, +a ].
Further, after ensuring that the pressure difference between the second outlet pressure value and the second preset target value is within the second preset deviation range, the variable frequency condensing fan 110 may be controlled to maintain the current power frequency; and further, according to the pressure difference between the first outlet pressure value of the evaporator 102 and the first preset target value, the variable frequency compressor 108 is controlled to perform rapid up-conversion adjustment, so as to ensure that the pressure difference between the first outlet pressure value and the first preset target value is kept within a first preset deviation range, and maintain the current compressor operating frequency unchanged. Finally, the controller 107 may further valve step the respective valves of the evaporator 102 to ultimately bring the first outlet pressure value to a first preset target value.
Optionally, as shown in fig. 1C, the air conditioning system 100 may further include a liquid reservoir 112, a dry filter 113, a liquid mirror 114, a solenoid valve 115, and a gas-liquid separator 116; one end of the liquid storage 112 is connected with the output end of the condenser 109, and the other end is connected with the electronic expansion valve 101 through the drying filter 113, the liquid-viewing mirror 114 and the electromagnetic valve 115; one end of the gas-liquid separator 116 is connected with the first electronic back pressure valve 105 and the second electronic back pressure valve 106, and the other end is connected with the input end of the variable frequency compressor 108;
the accumulator 112 is used for storing liquid components in the refrigerant output by the condenser 109; in the present embodiment, the accumulator 112 can reduce the load of the condenser 109, and can adapt to the demand of the load fluctuation for the refrigerant supply amount. When the evaporation load increases, the supply amount increases correspondingly, and the liquid stored in the liquid storage device 112 is replenished; when the evaporation load becomes smaller, the required liquid amount becomes correspondingly smaller, and the surplus liquid can be stored in the reservoir 112.
The dry filter 113 is used for absorbing moisture in the refrigerant passing through the liquid storage 112; second, the filter drier 113 can also block impurities in the system from passing through, and can prevent ice blockage and dirty blockage of the system pipeline.
The liquid-viewing mirror 114 is used for displaying the liquid level of the refrigerant; by observing the level of the refrigerant, it can be determined whether the system is operating properly and whether moisture is present at the rear end of the dry filter 113.
The electromagnetic valve 115 is used for allowing or limiting the flow of the refrigerant according to the on-off condition; typically, refrigerant flow is restricted (normally closed) when not energized, and is allowed when energized.
The gas-liquid separator 116 is configured to accommodate liquid components in the refrigerant output from the first electronic back pressure valve 105 and the second electronic back pressure valve 106. By employing the gas-liquid separator 116, liquid hammer to the inverter compressor 108 and dilution of compressor oil by excess refrigerant can be prevented.
Optionally, as shown in fig. 1D, the air conditioning system 100 may further include an evaporation fan 117, where an air channel of the evaporation fan 117 passes through the evaporator 102;
the evaporating fan 117 is used for transferring the cold energy emitted by the refrigerant in the evaporator 102 into the air. In the present embodiment, air conditioning cooling is achieved by employing the evaporation fan 117. Next, the evaporating fan 117 may be connected to the controller 107, for adjusting its own rotation speed according to a control signal of the controller 107.
In one specific example, the air conditioning system 100 may be as shown in FIG. 1E; the system comprises a CM-variable frequency compressor 108, a COND-condenser 109, an FD 1-variable frequency condensing fan 110, an HTP 1-condenser outlet pressure sensor 111, an LR-reservoir 112, a D1-drying filter 113, an SGN-liquid viewing mirror 114, an SV-solenoid valve 115, an EEV-electronic expansion valve 101, an EVAP-evaporator 102, an FDM 2-evaporating fan 117, an HTP 2-evaporator outlet pressure sensor 103, an HSV-pulse solenoid valve 104, an DX 1-first electronic back pressure valve 105, an DX 2-second electronic back pressure valve 106 and an RA-gas-liquid separator 116.
Specifically, after the refrigerant is output from the exhaust port of the variable frequency compressor 108, the refrigerant passes through the condenser 109, the condenser outlet pressure sensor 111, the liquid storage 112, the drying filter 113, the liquid viewing mirror 114, the electromagnetic valve 115, the electronic expansion valve 101, the evaporator 102, the evaporator outlet pressure sensor 103 and 2 paths of electronic back pressure valves connected in parallel with the outlet of the evaporator outlet pressure sensor 103, wherein a set of pulse electromagnetic valve 104 is additionally arranged at the inlet of the first electronic back pressure valve 105, a set of gas-liquid separator 116 is connected behind the outlet of the electronic back pressure valve, and the refrigerant after the gas-liquid separator 116 is discharged enters the variable frequency compressor 108 to form a closed loop.
The device has the advantages that the outlet pressure of the evaporator 102 can be quickly adjusted, the initial adjusting time is shortened, and the test data in the whole air conditioner product heat exchange effect test process can be ensured to meet the test requirement; secondly, the stability of the outlet pressure of the evaporator 102 can be improved, and the influence of the outlet pressure of the evaporator 102 on the system in the whole test process can be accurately judged; the range of the setting of the outlet pressure of the evaporator 102 can be enlarged, and the limitation of the adjustment section can be eliminated.
Example two
Fig. 2 is a flowchart of a method for controlling the outlet pressure of an evaporator according to a second embodiment of the present invention, where the method can be performed by a device for controlling the outlet pressure of the evaporator and can be applied to the controller 107 in the air conditioning system 100 according to the first embodiment of the present invention. As shown in fig. 2, the method includes:
s210, acquiring a first outlet pressure value of the evaporator through an outlet pressure sensor of the evaporator.
In this embodiment, the controller 107 may send a parameter reading instruction to a pressure sensor pre-disposed at the outlet of the evaporator 102 to obtain the pressure value of the refrigerant at the outlet of the evaporator 102 at different times as the first outlet pressure value.
S220, if the pressure difference value between the first outlet pressure value and the first preset target value is detected to be within a first preset deviation range, when the first outlet pressure value is detected to be larger than the first preset target value and the valve step of the electronic expansion valve is detected to be in a preset non-dead zone, the valve step of the electronic expansion valve is adjusted so that the first outlet pressure value is equal to the first preset target value.
In this embodiment, after ensuring that the pressure difference between the first outlet pressure value and the first preset target value is within the first preset deviation range, the electronic expansion valve 101 and the electronic back pressure valve may be used to perform synchronous control of the outlet pressure of the evaporator 102. Specifically, when it is detected that the first outlet pressure value is greater than the first preset target value, that is, is in the upper deviation, and the valve step of the electronic expansion valve 101 is in the preset non-dead zone, the valve step of the electronic expansion valve 101 may be controlled according to the first preset target value based on the PID algorithm, so as to stabilize the first outlet pressure value at the first preset target value.
Optionally, after determining that the valve step of the electronic expansion valve 101 is in the preset non-dead zone, it may further determine whether the pressure difference is within the preset adjustment range; if so, the valve step of the electronic expansion valve 101 may be adjusted.
Wherein the preset non-dead zone can be a preset adjustable valve step range; if the valve step is positioned in the preset non-dead zone, the valve step is adjustable; if the valve step is outside the preset non-dead zone, it indicates that the current valve step is no longer adjustable.
And S230, if the first outlet pressure value is detected to be smaller than the first preset target value and the valve step of the pulse electromagnetic valve, the first electronic back pressure valve or the second electronic back pressure valve is in a preset non-dead zone, adjusting the valve step of the pulse electromagnetic valve, the first electronic back pressure valve or the second electronic back pressure valve so that the first outlet pressure value is equal to the first preset target value.
In this embodiment, after ensuring that the pressure difference between the first outlet pressure value and the first preset target value is within the first preset deviation range, if it is detected that the first outlet pressure value is smaller than the first preset target value, that is, is in the lower deviation, and the valve steps of the pulse electromagnetic valve 104, the first electronic back pressure valve 105, or the second electronic back pressure valve 106 are in the preset non-dead zone, the corresponding valve may be adjusted in a valve step according to a preset adjustment rule (for example, the valve step is adjusted according to a preset valve sequence, or the valve in the preset non-dead zone is adjusted, etc.) based on the PID algorithm, so as to control the first outlet pressure value to be stabilized to the first preset target value.
Optionally, if the pressure difference between the first outlet pressure value and the first preset target value is outside the first preset deviation range, or each valve is at the adjustment limit, the variable frequency compressor 108 may be up-regulated to ensure that the outlet pressure value of the evaporator 102 remains stable, so that the air conditioning system 100 is always in the dynamic balance adjustment process.
In an optional implementation manner of this embodiment, adjusting the valve step of the pulse electromagnetic valve, the first electronic back pressure valve, or the second electronic back pressure valve so that the first outlet pressure value is equal to the first preset target value may include:
according to a preset step length, controlling the second electronic back pressure valve to gradually reduce valve steps, and controlling the second electronic back pressure valve to keep the preset minimum valve steps when detecting that the second electronic back pressure valve is adjusted to the preset minimum valve steps;
according to a preset step length, controlling the first electronic back pressure valve to gradually reduce valve steps, and controlling the first electronic back pressure valve to keep the preset minimum valve steps when detecting that the first electronic back pressure valve is adjusted to the preset minimum valve steps;
and gradually reducing the control signal value of the pulse electromagnetic valve according to a preset adjustment value until the first outlet pressure value is detected to be equal to the first preset target value or the control signal value is detected to be equal to 0.
The preset step length can be a preset single adjustment valve step; the preset adjustment value may be each adjustment value of the preset control signal value. In this embodiment, when the adjustment is initially started, each electronic back pressure valve is set to a fully open state by default, and the control signal value given to the pulse solenoid valve 104 is set to 100%. In the valve adjustment, the valve steps are adjusted in order of priority of the second electronic back pressure valve 106, the first electronic back pressure valve 105, and the pulse solenoid valve 104.
Specifically, first, the controller 107 gradually decreases the valve steps of the second electronic back pressure valve 106 according to a preset step size, and keeps the valve steps of the first electronic back pressure valve 105 and the pulse solenoid valve 104 unchanged. In this process, if the first pressure value is detected to be equal to the first preset target value, the valve step adjustment may be stopped. If the first pressure value is not detected to be equal to the first preset target value all the time, when the second electronic back pressure valve 106 is adjusted to the preset minimum valve step, the second electronic back pressure valve 106 can be made to maintain the preset minimum valve step, and the valve step of the first electronic back pressure valve 105 starts to be adjusted.
Then, the valve step of the pulse solenoid valve 104 is controlled to be constant, and the valve step of the first electronic back pressure valve 105 is gradually reduced according to the preset step size. Similarly, if it is not yet detected during the process that the outlet pressure value of the evaporator 102 is equal to the preset target value, the first electronic back pressure valve 105 may be controlled to maintain the preset minimum valve step when the first electronic back pressure valve 105 is adjusted to the preset minimum valve step.
Finally, the control signal value of the pulse solenoid valve 104 may be gradually reduced according to a preset adjustment value until, in the process, it is detected that the first outlet pressure value is equal to a first preset target value; otherwise, when the control signal value is adjusted to 0, the current valve adjustment is ended. In this embodiment, if the first outlet pressure value is not equal to the first preset target value after the adjustment of each valve, the inverter compressor 108 may be controlled to perform the adjustment.
According to the technical scheme, the controller obtains a first outlet pressure value of the evaporator through the evaporator outlet pressure sensor; then, if the pressure difference between the first outlet pressure value and the first preset target value is detected to be within a first preset deviation range, when the first outlet pressure value is detected to be larger than the first preset target value and the valve step of the electronic expansion valve is in a preset non-dead zone, the valve step of the electronic expansion valve is adjusted so that the first outlet pressure value is equal to the first preset target value; or if the first outlet pressure value is detected to be smaller than the first preset target value and the valve step of the pulse electromagnetic valve, the first electronic back pressure valve or the second electronic back pressure valve is in the preset non-dead zone, adjusting the valve step of the pulse electromagnetic valve, the first electronic back pressure valve or the second electronic back pressure valve so that the first outlet pressure value is equal to the first preset target value; the outlet pressure value of the evaporator is directly used as a parameter adjustment index, and the control device consisting of the electronic expansion valve, the pulse electromagnetic valve, the first electronic back pressure valve and the second electronic back pressure valve is used, so that the adjusting range of the outlet pressure control of the evaporator can be enlarged, and the adjusting precision can be improved.
In another optional implementation manner of this embodiment, before detecting that the pressure difference between the first outlet pressure value and the first preset target value is within the first preset deviation range, the method may further include:
acquiring a second outlet pressure value of the condenser through a condenser outlet pressure sensor;
and if the pressure difference value between the second outlet pressure value and the second preset target value is detected not to be within the second preset deviation range, adjusting the second frequency of the variable frequency condensing fan so that the pressure difference value between the second outlet pressure value and the second preset target value is within the second preset deviation range.
In the present embodiment, the outlet pressure of the condenser 109 is kept stable as a precondition for the outlet pressure of the evaporator 102 to be stable, and therefore, the controller 107 can obtain the second outlet pressure value of the condenser 109 in advance through the condenser outlet pressure sensor 111. At this time, if it is detected that the pressure difference between the second outlet pressure value and the second preset target value is not within the second preset deviation range, the power supply frequency of the variable frequency condensing fan 110 may be adjusted according to the second preset target value based on the PID algorithm to adjust the rotation speed of the variable frequency condensing fan 110, so as to adjust the second outlet pressure value, so that the pressure difference between the second outlet pressure value and the second preset target value is always within the second preset deviation range.
In another optional implementation manner of this embodiment, after adjusting the second frequency of the variable frequency condensing fan so that the pressure difference between the second outlet pressure value and the second preset target value is within the second preset deviation range, the method may further include:
and if the pressure difference value between the first outlet pressure value and the first preset target value is detected not to be within a first preset deviation range, adjusting the first frequency of the variable frequency compressor so that the pressure difference value between the first outlet pressure value of the evaporator and the first preset target value is within the first preset deviation range.
In this embodiment, after the outlet pressure of the condenser 109 reaches the requirement, if the controller 107 detects that the pressure difference between the first outlet pressure value and the first preset target value is not within the first preset deviation range, the variable frequency compressor 108 may be controlled to perform power frequency adjustment to perform rapid up-conversion adjustment. After detecting that the pressure difference between the current first outlet pressure value and the first preset target value is within the first preset deviation range, the current compressor operating frequency may be maintained to ensure that the pressure difference is always maintained within the preset deviation range.
Example III
Fig. 3 is a schematic structural diagram of a control device for outlet pressure of an evaporator according to a third embodiment of the present invention. As shown in fig. 3, the apparatus may be applied to the controller 107 in the air conditioning system 100 according to the first embodiment of the present invention, and may include: an evaporator pressure value acquisition module 310, a first valve step adjustment module 320, and a second valve step adjustment module 330; wherein, the liquid crystal display device comprises a liquid crystal display device,
an evaporator pressure value acquisition module 310, configured to acquire a first outlet pressure value of the evaporator through an evaporator outlet pressure sensor;
a first valve step adjustment module 320, configured to, if it is detected that the pressure difference between the first outlet pressure value and a first preset target value is within a first preset deviation range, adjust a valve step of the electronic expansion valve when it is detected that the first outlet pressure value is greater than the first preset target value and the valve step of the electronic expansion valve is in a preset non-dead zone, so that the first outlet pressure value is equal to the first preset target value;
and a second valve step adjustment module 330, configured to adjust a valve step of the pulse solenoid valve, the first electronic back pressure valve, or the second electronic back pressure valve so that the first outlet pressure value is equal to the first preset target value if it is detected that the first outlet pressure value is smaller than the first preset target value and the valve step of the pulse solenoid valve, the first electronic back pressure valve, or the second electronic back pressure valve is in a preset non-dead zone.
According to the technical scheme, the controller obtains a first outlet pressure value of the evaporator through the evaporator outlet pressure sensor; then, if the pressure difference between the first outlet pressure value and the first preset target value is detected to be within a first preset deviation range, when the first outlet pressure value is detected to be larger than the first preset target value and the valve step of the electronic expansion valve is in a preset non-dead zone, the valve step of the electronic expansion valve is adjusted so that the first outlet pressure value is equal to the first preset target value; or if the first outlet pressure value is detected to be smaller than the first preset target value and the valve step of the pulse electromagnetic valve, the first electronic back pressure valve or the second electronic back pressure valve is in the preset non-dead zone, adjusting the valve step of the pulse electromagnetic valve, the first electronic back pressure valve or the second electronic back pressure valve so that the first outlet pressure value is equal to the first preset target value; the outlet pressure value of the evaporator is directly used as a parameter adjustment index, and the control device consisting of the electronic expansion valve, the pulse electromagnetic valve, the first electronic back pressure valve and the second electronic back pressure valve is used, so that the adjusting range of the outlet pressure control of the evaporator can be enlarged, and the adjusting precision can be improved.
Optionally, the second valve step adjustment module 330 is specifically configured to control the second electronic back pressure valve to gradually decrease a valve step according to a preset step size, and control the second electronic back pressure valve to maintain a preset minimum valve step when it is detected that the second electronic back pressure valve is adjusted to the preset minimum valve step;
according to a preset step length, controlling the first electronic back pressure valve to gradually reduce valve steps, and controlling the first electronic back pressure valve to keep the preset minimum valve steps when detecting that the first electronic back pressure valve is adjusted to the preset minimum valve steps;
and gradually reducing the control signal value of the pulse electromagnetic valve according to a preset adjustment value until the first outlet pressure value is detected to be equal to the first preset target value or the control signal value is detected to be equal to 0.
Optionally, the control device for outlet pressure of the evaporator further comprises:
the condenser pressure value acquisition module is used for acquiring a second outlet pressure value of the condenser through the condenser outlet pressure sensor;
and the fan frequency adjusting module is used for adjusting the second frequency of the variable-frequency condensing fan if the pressure difference value between the second outlet pressure value and the second preset target value is detected not to be in the second preset deviation range, so that the pressure difference value between the second outlet pressure value and the second preset target value is in the second preset deviation range.
Optionally, the control device for outlet pressure of the evaporator further comprises:
and the compressor frequency adjusting module is used for adjusting the first frequency of the variable-frequency compressor if the pressure difference value between the first outlet pressure value and the first preset target value is detected not to be within a first preset deviation range, so that the pressure difference value between the first outlet pressure value of the evaporator and the first preset target value is within the first preset deviation range.
The control device for the outlet pressure of the evaporator provided by the embodiment of the invention can execute the control method for the outlet pressure of the evaporator provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example IV
In this embodiment, the method of controlling the evaporator outlet pressure may be implemented as computer instructions, which are tangibly embodied in a computer-readable storage medium, such as a storage unit. In some embodiments, some or all of the computer instructions may be loaded and/or installed onto an electronic device via a ROM and/or a communications unit. When computer instructions are loaded into RAM and executed by a processor, one or more steps of the evaporator outlet pressure control method described above may be performed. Alternatively, in other embodiments, the processor may be configured to perform the method of controlling the evaporator outlet pressure in any other suitable manner (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. An air conditioning system is characterized by comprising an electronic expansion valve, an evaporator outlet pressure sensor, a pulse electromagnetic valve, a first electronic back pressure valve, a second electronic back pressure valve and a controller;
the electronic expansion valve is connected with the input end of the evaporator, the evaporator outlet pressure sensor and the second electronic back pressure valve are connected with the output end of the evaporator, the first electronic back pressure valve is connected with the output end of the evaporator through the pulse electromagnetic valve, and the second electronic back pressure valve is connected with the first electronic back pressure valve and the pulse electromagnetic valve in parallel;
The controller is respectively connected with the electronic expansion valve, the evaporator outlet pressure sensor, the pulse electromagnetic valve, the first electronic back pressure valve and the second electronic back pressure valve, and is used for acquiring a first outlet pressure value of the evaporator through the evaporator outlet pressure sensor and controlling the first outlet pressure value to be equal to a first preset target value through adjusting valve steps of the electronic expansion valve, the pulse electromagnetic valve, the first electronic back pressure valve and the second electronic back pressure valve.
2. The air conditioning system of claim 1, further comprising a variable frequency compressor, a condenser, a variable frequency condensing fan, and a condenser outlet pressure sensor, wherein an output of the variable frequency compressor is connected to the electronic expansion valve through the condenser, and the variable frequency condensing fan forces condenser air to circulate to increase condenser heat dissipation;
the condenser outlet pressure sensor is respectively connected with the output end of the condenser and the controller, and is used for acquiring a second outlet pressure value of the condenser and sending the second outlet pressure value to the controller;
the controller is respectively connected with the variable frequency condensing fan and the variable frequency compressor, and is further used for controlling the pressure difference between the first outlet pressure value of the evaporator and the first preset target value to be within a first preset deviation range by adjusting the first frequency of the variable frequency compressor, and controlling the pressure difference between the second outlet pressure value and the second preset target value to be within a second preset deviation range by adjusting the second frequency of the variable frequency condensing fan.
3. The air conditioning system of claim 2, further comprising a reservoir, a dry filter, a liquid mirror, a solenoid valve, and a gas-liquid separator; one end of the liquid storage device is connected with the output end of the condenser, and the other end of the liquid storage device is connected with the electronic expansion valve through the drying filter, the liquid viewing mirror and the electromagnetic valve; one end of the gas-liquid separator is connected with the first electronic back pressure valve and the second electronic back pressure valve, and the other end of the gas-liquid separator is connected with the input end of the variable frequency compressor;
the liquid accumulator is used for storing liquid components in the refrigerant output by the condenser;
the drying filter is used for absorbing moisture in the refrigerant passing through the liquid reservoir;
the liquid viewing mirror is used for displaying the liquid level of the refrigerant;
the electromagnetic valve is used for allowing or limiting the flow of the refrigerant according to the on-off condition;
the gas-liquid separator is used for containing liquid components in the refrigerants output by the first electronic back pressure valve and the second electronic back pressure valve.
4. The air conditioning system of claim 3, further comprising an evaporator fan having a wind path passing through the evaporator;
The evaporation fan is used for transmitting the cold energy emitted by the refrigerant in the evaporator to the air.
5. A method of controlling outlet pressure of an evaporator, characterized by being applied to the controller in the air conditioning system according to any one of claims 1 to 4, comprising:
acquiring a first outlet pressure value of the evaporator through an outlet pressure sensor of the evaporator;
if the pressure difference between the first outlet pressure value and a first preset target value is detected to be within a first preset deviation range, when the first outlet pressure value is detected to be larger than the first preset target value and the valve step of the electronic expansion valve is detected to be in a preset non-dead zone, the valve step of the electronic expansion valve is adjusted so that the first outlet pressure value is equal to the first preset target value;
and if the first outlet pressure value is detected to be smaller than the first preset target value and the valve step of the pulse electromagnetic valve, the first electronic back pressure valve or the second electronic back pressure valve is in a preset non-dead zone, adjusting the valve step of the pulse electromagnetic valve, the first electronic back pressure valve or the second electronic back pressure valve so that the first outlet pressure value is equal to the first preset target value.
6. The method of claim 5, wherein adjusting the valve step of the pulsed solenoid valve, the first electronic back pressure valve, or the second electronic back pressure valve to have the first outlet pressure value equal to the first preset target value comprises:
according to a preset step length, controlling the second electronic back pressure valve to gradually reduce valve steps, and controlling the second electronic back pressure valve to keep the preset minimum valve steps when detecting that the second electronic back pressure valve is adjusted to the preset minimum valve steps;
according to a preset step length, controlling the first electronic back pressure valve to gradually reduce valve steps, and controlling the first electronic back pressure valve to keep the preset minimum valve steps when detecting that the first electronic back pressure valve is adjusted to the preset minimum valve steps;
and gradually reducing the control signal value of the pulse electromagnetic valve according to a preset adjustment value until the first outlet pressure value is detected to be equal to the first preset target value or the control signal value is detected to be equal to 0.
7. The method of claim 5, further comprising, prior to detecting that the pressure difference between the first outlet pressure value and a first preset target value is within a first preset deviation range:
Acquiring a second outlet pressure value of the condenser through a condenser outlet pressure sensor;
and if the pressure difference value between the second outlet pressure value and the second preset target value is detected not to be within the second preset deviation range, adjusting the second frequency of the variable frequency condensing fan so that the pressure difference value between the second outlet pressure value and the second preset target value is within the second preset deviation range.
8. The method of claim 7, further comprising, after adjusting the second frequency of the variable frequency condensing fan such that the pressure difference between the second outlet pressure value and a second preset target value is within a second preset deviation range:
and if the pressure difference value between the first outlet pressure value and the first preset target value is detected not to be within a first preset deviation range, adjusting the first frequency of the variable frequency compressor so that the pressure difference value between the first outlet pressure value of the evaporator and the first preset target value is within the first preset deviation range.
9. A control device of evaporator outlet pressure, characterized by being applied to a controller in an air conditioning system according to any one of claims 1 to 4, comprising:
The evaporator pressure value acquisition module is used for acquiring a first outlet pressure value of the evaporator through the evaporator outlet pressure sensor;
the first valve step adjusting module is used for adjusting the valve step of the electronic expansion valve to enable the first outlet pressure value to be equal to a first preset target value when the first outlet pressure value is detected to be larger than the first preset target value and the valve step of the electronic expansion valve is in a preset non-dead zone if the pressure difference value between the first outlet pressure value and the first preset target value is detected to be within a first preset deviation range;
and the second valve step adjusting module is used for adjusting the valve steps of the pulse electromagnetic valve, the first electronic back pressure valve or the second electronic back pressure valve to enable the first outlet pressure value to be equal to the first preset target value if the first outlet pressure value is detected to be smaller than the first preset target value and the valve steps of the pulse electromagnetic valve, the first electronic back pressure valve or the second electronic back pressure valve are in a preset non-dead zone.
10. A computer readable storage medium, characterized in that the computer readable storage medium stores computer instructions for causing a processor to execute the method of controlling the outlet pressure of the evaporator according to any one of claims 5-8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310716052.8A CN116753611A (en) | 2023-06-16 | 2023-06-16 | Air conditioning system, control method, device and medium for outlet pressure of evaporator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310716052.8A CN116753611A (en) | 2023-06-16 | 2023-06-16 | Air conditioning system, control method, device and medium for outlet pressure of evaporator |
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| CN202310716052.8A Pending CN116753611A (en) | 2023-06-16 | 2023-06-16 | Air conditioning system, control method, device and medium for outlet pressure of evaporator |
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