CN108870689B - Pressure control method and system of air conditioning unit - Google Patents
Pressure control method and system of air conditioning unit Download PDFInfo
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- CN108870689B CN108870689B CN201810783906.3A CN201810783906A CN108870689B CN 108870689 B CN108870689 B CN 108870689B CN 201810783906 A CN201810783906 A CN 201810783906A CN 108870689 B CN108870689 B CN 108870689B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 234
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000005057 refrigeration Methods 0.000 claims abstract description 11
- 238000004781 supercooling Methods 0.000 claims description 36
- 239000003507 refrigerant Substances 0.000 abstract description 20
- 238000001816 cooling Methods 0.000 description 11
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 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
- 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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/40—Pressure, e.g. wind pressure
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- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a pressure control method and system of an air conditioning unit. The pressure control method includes: judging a system operation mode of the current operation of the air conditioning unit, wherein the system operation mode comprises a refrigeration operation mode and a heating operation mode; acquiring a plurality of system parameters of the air conditioning unit according to the current operating system operating mode of the air conditioning unit; determining the intermediate pressure of the air conditioning unit according to the system parameters; and adjusting the opening of an electronic expansion valve of the air conditioning unit according to the intermediate pressure of the air conditioning unit, and controlling the intermediate pressure of the air conditioning unit. The pressure control method and the system can ensure that enough power promotes refrigerant circulation when the internal machine and the external machine of the air conditioning unit are connected by the ultra-normal high drop.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a pressure control method and system of an air conditioning unit.
Background
In recent years, multi-connected air conditioning units are increasingly popular with users due to the advantages of free combined arrangement, excellent load efficiency, flexible and convenient installation and the like, and the market capacity of the multi-connected air conditioning units is continuously increased. However, in the process of engineering installation, the multi-connected air conditioning unit often faces the situation that the internal and external units are respectively installed on different floors, and when the floor span of the multi-connected air conditioning unit where the internal and external units are installed is too large, the performance of the air conditioning unit is affected.
Disclosure of Invention
In view of the above, there is a need to provide a method and system for controlling the pressure of an air conditioning unit by adjusting internal parameters of the air conditioning unit.
A pressure control method of an air conditioning unit, wherein the method comprises:
judging a system operation mode of the current operation of the air conditioning unit, wherein the system operation mode comprises a refrigeration operation mode and a heating operation mode;
acquiring a plurality of system parameters of the air conditioning unit according to the current operating system operating mode of the air conditioning unit;
determining the intermediate pressure of the air conditioning unit according to the system parameters;
and adjusting the opening of an electronic expansion valve of the air conditioning unit according to the intermediate pressure of the air conditioning unit, and controlling the intermediate pressure of the air conditioning unit.
In one embodiment, the obtaining a plurality of system parameters of the air conditioning unit according to the system operation mode of the current operation of the air conditioning unit includes:
when the system operation mode of the current operation of the air conditioning unit is in a refrigeration operation mode, acquiring the temperature of an inner machine outlet pipe, the temperature of an inner machine inlet pipe, the exhaust temperature of a compressor, the opening degree of an outer machine electronic expansion valve, the suction pressure of the compressor and the exhaust pressure of the compressor of the air conditioning unit;
or acquiring the exhaust temperature of a compressor of the air conditioning unit, the opening of an internal machine electronic expansion valve, the suction pressure of the compressor and the exhaust pressure of the compressor.
In one embodiment, the determining the intermediate pressure of the air conditioning unit according to the plurality of system parameters includes:
obtaining the superheat degree of the inner machine of the air conditioning unit according to the outlet pipe temperature of the inner machine and the inlet pipe temperature of the inner machine;
obtaining the exhaust superheat degree of the air conditioning unit according to the exhaust temperature of the compressor and the exhaust pressure of the compressor;
determining the intermediate pressure of the air conditioning unit according to the opening of the electronic expansion valve of the indoor unit, the suction pressure of the compressor and the exhaust superheat degree; or judging the intermediate pressure of the air conditioning unit according to the superheat degree of the inner machine, the suction pressure of the compressor and the exhaust superheat degree.
In one embodiment, the intermediate pressure of the air conditioning unit is determined according to the opening degree of the internal machine electronic expansion valve, the suction pressure of the compressor and the exhaust superheat degree; or, the determining the intermediate pressure of the air conditioning unit according to the indoor unit superheat degree, the compressor suction pressure and the exhaust superheat degree comprises:
if the opening degree of the internal machine electronic expansion valve is smaller than the preset value of the opening degree of the internal machine electronic expansion valve or the superheat degree of the internal machine is smaller than the preset value of the superheat degree of the internal machine, and meanwhile, the suction pressure of the compressor is smaller than the preset value of the suction pressure of the compressor and the exhaust superheat degree is larger than the preset value of the exhaust superheat degree, the middle pressure of the air conditioning unit is judged to be too small;
and if the opening degree of the internal machine electronic expansion valve is greater than the preset value of the opening degree of the internal machine electronic expansion valve or the superheat degree of the internal machine is greater than the preset value of the superheat degree of the internal machine, and meanwhile, the suction pressure of the compressor is greater than the preset value of the suction pressure of the compressor and the exhaust superheat degree is less than the preset value of the exhaust superheat degree, judging that the intermediate pressure of the air conditioning unit is too large.
In one embodiment, the adjusting the opening of the electronic expansion valve of the air conditioning unit according to the intermediate pressure of the air conditioning unit to control the intermediate pressure of the air conditioning unit includes:
when the intermediate pressure of the air conditioning unit is too small, adjusting the opening of an external machine electronic expansion valve to increase the opening of the external machine electronic expansion valve, and improving the intermediate pressure of the air conditioning unit;
when the intermediate pressure of the air conditioning unit is too high, the opening degree of the outer machine electronic expansion valve is adjusted, so that the opening degree of the outer machine electronic expansion valve is reduced, and the intermediate pressure of the air conditioning unit is reduced.
In one embodiment, the obtaining a plurality of system parameters of the air conditioning unit according to the system operation mode of the current operation of the air conditioning unit includes:
and when the current running system running mode of the air conditioning unit is in a heating running mode, obtaining the outlet pipe temperature of an internal unit of the air conditioning unit, the exhaust temperature of a compressor, the suction pressure of the compressor and the exhaust pressure of the compressor.
In one embodiment, the determining the intermediate pressure of the air conditioning unit according to the plurality of system parameters further includes:
obtaining the supercooling degree of the inner machine of the air conditioning unit according to the exhaust pressure of the compressor and the outlet pipe temperature of the inner machine;
obtaining the exhaust superheat degree of the air conditioning unit according to the exhaust temperature of the compressor and the exhaust pressure of the compressor;
and judging the intermediate pressure of the air conditioning unit according to the supercooling degree of the internal unit, the suction pressure of the compressor and the exhaust superheat degree.
In one embodiment, the determining the intermediate pressure of the air conditioning unit according to the supercooling degree of the internal unit, the suction pressure of the compressor and the exhaust superheat degree comprises:
if the supercooling degree of the indoor unit is smaller than the preset supercooling degree value of the indoor unit, and meanwhile, the suction pressure of the compressor is smaller than the preset suction pressure value of the compressor and the exhaust superheat degree is larger than the preset exhaust superheat degree value, the intermediate pressure of the air conditioning unit is judged to be too large;
and if the supercooling degree of the indoor unit is greater than the preset supercooling degree value of the indoor unit, and meanwhile, the suction pressure of the compressor is greater than the preset suction pressure value of the compressor and the exhaust superheat degree is less than the preset exhaust superheat degree value, determining that the intermediate pressure of the air conditioning unit is too small.
In one embodiment, the adjusting the opening of the electronic expansion valve of the air conditioning unit according to the intermediate pressure of the air conditioning unit so as to control the intermediate pressure of the air conditioning unit further includes:
when the intermediate pressure of the air conditioning unit is too high, adjusting the opening of an internal electronic expansion valve to reduce the opening of the internal electronic expansion valve, and reducing the intermediate pressure of the air conditioning unit;
when the intermediate pressure of the air conditioning unit is too small, the opening degree of the internal electronic expansion valve is adjusted, so that the opening degree of the internal electronic expansion valve is increased, and the intermediate pressure of the air conditioning unit is improved.
A pressure control system for an air conditioning assembly, wherein the system comprises:
an operation mode judgment module: the system operation mode judging unit is used for judging the current operation system operation mode of the air conditioning unit, and the system operation mode comprises a refrigeration operation mode and a heating operation mode;
a system parameter acquisition module: the system comprises a control unit, a data processing unit and a data processing unit, wherein the control unit is used for acquiring a plurality of system parameters of the air conditioning unit according to a system operation mode of the current operation of the air conditioning unit;
an intermediate pressure determination module: the system is used for judging the intermediate pressure of the air conditioning unit according to the system parameters;
an intermediate pressure control module: and the electronic expansion valve is used for adjusting the opening of the electronic expansion valve of the air conditioning unit according to the intermediate pressure of the air conditioning unit and controlling the intermediate pressure of the air conditioning unit.
According to the pressure control method and the pressure control system of the air conditioning unit, aiming at different operation modes of the air conditioning unit, the intermediate pressure of the air conditioning unit is judged; further, according to the intermediate pressure of the air conditioning unit, the opening degree of an electronic expansion valve of the air conditioning unit is adjusted, so that the intermediate pressure of the air conditioning unit is controlled. The pressure control method and the pressure control system of the air conditioning unit can ensure that enough power promotes refrigerant circulation when the internal machine and the external machine of the air conditioning unit are connected in a supernormal high drop.
Drawings
FIG. 1 is a schematic flow chart of a pressure control method of an air conditioning unit according to an embodiment;
FIG. 2 is a flowchart illustrating an intermediate pressure determination in the cooling operation mode according to an embodiment;
fig. 3 is a flowchart illustrating an intermediate pressure determination in the heating operation mode according to an embodiment;
FIG. 4 is a flow chart illustrating a method for determining a pressure control for an air conditioning unit according to one embodiment;
fig. 5 is a block diagram of a pressure control system of an air conditioning unit according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following describes a control system and method for a central freezer with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In an embodiment of the present invention, as shown in fig. 1, a pressure control method for an air conditioning unit is provided, which is described by taking the method as an example, and includes the following steps:
step S201, judging a system operation mode of the current operation of the air conditioning unit, wherein the system operation mode comprises a refrigeration operation mode and a heating operation mode.
The air conditioning unit is operated in different modes, and the circulation directions and modes of the refrigerant are different, so that different control modes are required to be adopted for the air conditioning unit subsequently according to the obtained different system operation modes. The judging of the current running system running mode of the air conditioning unit comprises the following steps: and judging whether the system operation mode of the air conditioning unit is in a cooling operation mode or a heating operation mode.
Step S202, a plurality of system parameters of the air conditioning unit are obtained according to the system operation mode of the current operation of the air conditioning unit.
Because the control modes are different for different system modes, the used system parameters are different.
In one embodiment, when the system operation mode of the current operation of the air conditioning unit is in the cooling operation mode, the obtaining of the system parameters of the air conditioning unit includes obtaining an opening of an electronic expansion valve of an internal unit, a suction pressure of a compressor, and an exhaust pressure of the compressor, and obtaining an exhaust temperature of the compressor or obtaining an outlet pipe temperature of the internal unit and an inlet pipe temperature of the internal unit at the same time.
The temperature of the outlet pipe of the internal unit represents the temperature of an air outlet of the internal unit of the air conditioner; the temperature of the indoor unit inlet pipe represents the temperature of an air inlet of the indoor unit of the air conditioner; the compressor exhaust temperature represents the temperature of a refrigerant discharged by a compressor of the air conditioner; an opening of an Electronic Expansion Valve (EEV) of an inner and outer unit, which has a great influence on a compressor discharge pressure, a gas cooler outlet pressure and a compressor discharge temperature; the compressor suction pressure represents the pressure of a refrigerant in an exhaust pipe at an air inlet of the compressor; the compressor discharge pressure represents the pressure of the refrigerant in the discharge pipe at the air outlet of the compressor.
In one embodiment, when the system operation mode of the current operation of the air conditioning unit is in a heating operation mode, the temperature of an internal outlet pipe of the air conditioning unit, the exhaust temperature of a compressor, the suction pressure of the compressor and the exhaust pressure of the compressor are obtained.
And step S203, judging the intermediate pressure of the air conditioning unit according to the plurality of system parameters.
The intermediate pressure refers to a pressure of the refrigerant in a pipe between the outer unit EEV and the inner unit EEV.
Further, because different values of the system parameters correspond to the refrigerant flowing body, the refrigerant flowing state can be judged according to the system parameters. In one embodiment, when the air conditioning unit is in the cooling operation mode, as shown in fig. 2, the detailed description of step S203 includes the following steps:
and S2031, obtaining the superheat degree of the indoor unit of the air conditioning unit according to the outlet pipe temperature and the inlet pipe temperature of the indoor unit.
The superheat degree of the inner machine is equal to the temperature of the outlet pipe of the inner machine-the temperature of the inlet pipe of the inner machine, so that no liquid refrigerant returns to the compressor, and the compressor is prevented from being hit by liquid.
And S2033, obtaining the exhaust superheat degree of the air conditioning unit according to the exhaust temperature of the compressor and the exhaust pressure of the compressor.
The exhaust superheat degree is the saturation temperature corresponding to the compressor exhaust temperature and the compressor exhaust pressure, and can prevent gas exhausted by the high-pressure cavity compressor from being liquefied in the high-pressure cavity, so that the solid refrigerant is prevented from being diluted.
Step S2035, determining the intermediate pressure of the air conditioning unit according to the opening of the electronic expansion valve of the indoor unit, the suction pressure of the compressor and the exhaust superheat degree; or judging the intermediate pressure of the air conditioning unit according to the superheat degree of the inner machine, the suction pressure of the compressor and the exhaust superheat degree.
In one embodiment, as shown in fig. 4, when the system operation mode of the air conditioning unit is in the cooling operation mode, if the opening degree of the indoor unit electronic expansion valve is smaller than the preset opening degree of the indoor unit electronic expansion valve or the superheat degree of the indoor unit is smaller than the preset superheat degree of the indoor unit, and at the same time, the suction pressure of the compressor is smaller than the preset suction pressure of the compressor and the exhaust superheat degree of the exhaust gas is larger than the preset exhaust superheat degree, it is determined that the intermediate pressure of the air conditioning unit is too small.
The preset value of the opening of the internal electronic expansion valve can be set according to the actual operation condition of the air conditioning unit, and can be set to be added with an offset value on the basis of the target value of the opening of the internal electronic expansion valve. For example: setting the preset value of the opening of the internal machine electronic expansion valve as a target value-1 of the opening of the internal machine electronic expansion valve; likewise, the indoor unit superheat degree preset values may be set as: the preset value of the superheat degree of the indoor unit is equal to the target value-1 of the superheat degree of the indoor unit; the compressor suction pressure preset values can be set as: the preset value of the suction pressure of the compressor is equal to the target value-3 of the suction pressure of the compressor; the preset exhaust superheat values may be set as: the preset exhaust superheat value is equal to the target exhaust superheat value + 15.
When the three conditions are met simultaneously, the intermediate pressure of the air conditioning unit is judged to be too low, and the circulating power is not enough to push the refrigerant of the air conditioning indoor unit to flow to the air conditioning outdoor unit.
Further, when the system operation mode of the current operation of the air conditioning unit is in a refrigeration operation mode, if the opening of the internal electronic expansion valve is larger than the preset value of the opening of the internal electronic expansion valve or the superheat degree of the internal electronic expansion valve is larger than the preset value of the superheat degree of the internal electronic expansion valve, and meanwhile, the suction pressure of the compressor is larger than the preset value of the suction pressure of the compressor and the exhaust superheat degree is smaller than the preset value of the exhaust superheat degree, the intermediate pressure of the air conditioning unit is judged to be too large.
When the three conditions are met, the intermediate pressure of the air conditioning unit is judged to be too large, and the refrigerant quantity of the air conditioning unit is caused to be too large by the circulating power.
In one embodiment, when the air conditioning unit is in the heating operation mode, as shown in fig. 3, the detailed description of step S203 includes the following steps:
and S2032, obtaining the supercooling degree of the indoor unit of the air conditioning unit according to the exhaust pressure of the compressor and the outlet pipe temperature of the indoor unit.
The supercooling degree of the inner machine is a parameter representing the flow of a refrigerant of the inner machine of the air conditioner, wherein the supercooling degree of the inner machine is the saturation temperature corresponding to the exhaust pressure of the compressor-the temperature of an outlet pipe of the inner machine.
And S2034, obtaining the exhaust superheat degree of the air conditioning unit according to the exhaust temperature of the compressor and the exhaust pressure of the compressor.
The exhaust superheat degree is the saturation temperature corresponding to the exhaust temperature of the compressor and the exhaust pressure of the compressor, and the exhaust superheat degree can prevent gas exhausted by the high-pressure cavity compressor from being liquefied in the high-pressure cavity, so that the solid refrigerant is prevented from being diluted.
And S2036, determining the intermediate pressure of the air conditioning unit according to the supercooling degree of the internal unit, the suction pressure of the compressor and the exhaust superheat degree.
In one embodiment, as shown in fig. 4, when the system operation mode of the current operation of the air conditioning unit is in the heating operation mode, if the supercooling degree of the internal unit is less than the preset supercooling degree value of the internal unit, and at the same time, the suction pressure of the compressor is less than the preset suction pressure value of the compressor, and the exhaust superheat degree is greater than the preset exhaust superheat degree value, it is determined that the intermediate pressure of the air conditioning unit is too large.
The indoor unit supercooling degree preset value can be set according to the actual running condition of the air conditioning unit, and an offset value can be added on the basis of the target value of the indoor unit supercooling degree. For example: setting the indoor unit supercooling degree preset value as a target value of the indoor unit supercooling degree-5; likewise, the compressor suction pressure preset values can be set as: the preset value of the suction pressure of the compressor is equal to the target value of the suction pressure of the compressor plus 5; the preset exhaust superheat values may be set as: the preset exhaust superheat value is equal to the target exhaust superheat value + 10.
When the three conditions are met simultaneously, the intermediate pressure of the air conditioning unit is judged to be too high, and the circulating power is not enough to push the refrigerant of the air conditioning indoor unit to flow to the air conditioning outdoor unit.
Further, when the system running mode of the current running of the air conditioning unit is in a heating running mode, if the supercooling degree of the indoor unit is greater than the preset supercooling degree value of the indoor unit, and meanwhile, the suction pressure of the compressor is greater than the preset suction pressure value of the compressor and the exhaust superheat degree is less than the preset exhaust superheat degree value, the intermediate pressure of the air conditioning unit is judged to be too small.
When the three conditions are met, the intermediate pressure of the air conditioning unit is judged to be too small, and the refrigerant quantity of the internal unit flows back quickly.
And S204, adjusting the opening of the electronic expansion valve of the air conditioning unit according to the intermediate pressure of the air conditioning unit, and controlling the intermediate pressure of the air conditioning unit.
In one embodiment, as shown in fig. 4, when the system operation mode of the air conditioning unit is in the cooling operation mode, and the opening of the internal electronic expansion valve is smaller than the preset value of the opening of the internal electronic expansion valve or the superheat of the internal electronic expansion valve is smaller than the preset value of the superheat of the internal electronic expansion valve, and at the same time, the suction pressure of the compressor is smaller than the preset value of the suction pressure of the compressor, and the exhaust superheat is larger than the preset value of the exhaust superheat, at this time, the opening of the external EEV is adjusted, so that the opening of the external EEV is increased, thereby increasing the intermediate pressure of the air conditioning unit and promoting the.
The adjustment formula of the opening degree of the external unit EEV is as follows:
the variation of the opening of the external unit EEV is A (exhaust superheat degree-exhaust superheat degree preset value)
Wherein, a represents a coefficient of the air conditioner outdoor unit, and as shown in table 1, the coefficient may be selected to have different values according to a difference range between a suction pressure of the compressor and a preset value of the suction pressure of the compressor.
TABLE 1
| Suction pressure of | compressor-preset suction pressure of compressor | non-calculation | Coefficient A of air conditioner outdoor unit |
| [0,3] | 0 |
| (3,8] | 5 |
| ＞8 | 10 |
In one embodiment, as shown in fig. 4, when the system operation mode of the current operation of the air conditioning unit is in the cooling operation mode, if the opening of the internal electronic expansion valve is greater than the preset opening of the internal electronic expansion valve or the superheat of the internal electronic expansion valve is greater than the preset superheat of the internal electronic expansion valve, and at the same time, the suction pressure of the compressor is greater than the preset suction pressure of the compressor, and the discharge superheat is less than the preset discharge superheat, at this time, the opening of the external EEV is adjusted to reduce the opening of the external EEV, so that the intermediate pressure of the air conditioning unit is reduced, and the circulation amount of the refrigerant is controlled within a reasonable range.
The adjustment formula of the opening degree of the external unit EEV is as follows:
the variation of the opening of the external unit EEV is A (exhaust superheat degree-exhaust superheat degree preset value)
Wherein, a represents a coefficient of the air conditioner outdoor unit, and as shown in table 1, the coefficient may be selected to have different values according to a difference range between a suction pressure of the compressor and a preset value of the suction pressure of the compressor.
In one embodiment, as shown in fig. 4, when the system operation mode of the current operation of the air conditioning unit is in the heating operation mode, if the supercooling degree of the internal unit is less than the preset supercooling degree value of the internal unit, and at the same time, the suction pressure of the compressor is less than the preset suction pressure value of the compressor, and the exhaust superheat degree is greater than the preset exhaust superheat degree value, at this time, the opening degree of the internal unit EEV is adjusted to decrease the opening degree of the internal unit EEV, so that the intermediate pressure of the air conditioning unit is reduced, and the refrigerant circulation at the internal unit of the air conditioner is promoted.
The adjusting formula of the opening of the internal machine EEV is as follows:
the variation of the opening of the internal machine EEV is A (exhaust superheat degree-exhaust superheat degree preset value)
Wherein, a represents the coefficient of the air conditioner indoor unit, and as shown in table 1, the coefficient can be selected to have different values according to the difference range between the suction pressure of the compressor and the preset value of the suction pressure of the compressor.
In one embodiment, as shown in fig. 4, when the system operation mode of the current operation of the air conditioning unit is in the heating operation mode, if the supercooling degree of the internal unit is greater than the preset supercooling degree value of the internal unit, and at the same time, the suction pressure of the compressor is greater than the preset suction pressure value of the compressor, and the exhaust superheat degree is less than the preset exhaust superheat degree value, at this time, the opening degree of the internal unit EEV is adjusted to increase the opening degree of the internal unit EEV, so that the intermediate pressure of the air conditioning unit is increased, and the circulation volume of the refrigerant is controlled within a reasonable range.
In one embodiment, as shown in fig. 5, a pressure control system of an air conditioning unit is provided, where the system includes an operation mode determining module 401, a system parameter obtaining module 402, an intermediate pressure determining module 403, and an intermediate pressure control module 404, and the system is described as an example and includes:
the operation mode determination module 401: and the system operation mode is used for judging the current operation system operation mode of the air conditioning unit, and the system operation mode comprises a refrigeration operation mode and a heating operation mode.
The system parameter acquisition module 402: and the system is used for acquiring a plurality of system parameters of the air conditioning unit according to the system operation mode of the current operation of the air conditioning unit.
The intermediate pressure determination module 403: and the system is used for judging the intermediate pressure of the air conditioning unit according to the system parameters.
Intermediate pressure control module 404: and the electronic expansion valve is used for adjusting the opening of the electronic expansion valve of the air conditioning unit according to the intermediate pressure of the air conditioning unit and controlling the intermediate pressure of the air conditioning unit.
In one embodiment, the system parameter obtaining module 402 is specifically configured to obtain an internal unit outlet pipe temperature, an internal unit inlet pipe temperature, a compressor exhaust temperature, a compressor suction pressure, and a compressor exhaust pressure of the air conditioning unit when the air conditioning unit is in a cooling operation mode; or acquiring the exhaust temperature of a compressor of the air conditioning unit, the opening of an internal machine electronic expansion valve, the suction pressure of the compressor and the exhaust pressure of the compressor; and when the air conditioning unit is in a heating operation mode, obtaining the outlet pipe temperature of an internal machine of the air conditioning unit, the exhaust temperature of a compressor, the suction pressure of the compressor and the exhaust pressure of the compressor.
In one embodiment, the intermediate pressure determination module 403 is specifically configured to, when the air conditioning unit is in a cooling operation mode, obtain an indoor unit superheat degree of the air conditioning unit according to the indoor unit outlet pipe temperature and the indoor unit inlet pipe temperature; obtaining the exhaust superheat degree of the air conditioning unit according to the exhaust temperature of the compressor and the exhaust pressure of the compressor; determining the intermediate pressure of the air conditioning unit according to the opening of the electronic expansion valve of the indoor unit, the suction pressure of the compressor and the exhaust superheat degree; or judging the intermediate pressure of the air conditioning unit according to the superheat degree of the inner machine, the suction pressure of the compressor and the exhaust superheat degree.
In one embodiment, the intermediate pressure determination module 403 is specifically configured to, when the air conditioning unit is in a heating operation mode, obtain an indoor unit supercooling degree of the air conditioning unit according to the compressor discharge pressure and the indoor unit outlet pipe temperature; obtaining the exhaust superheat degree of the air conditioning unit according to the exhaust temperature of the compressor and the exhaust pressure of the compressor; and judging the intermediate pressure of the air conditioning unit according to the supercooling degree of the internal unit, the suction pressure of the compressor and the exhaust superheat degree.
In one embodiment, the intermediate pressure determining module 403 is specifically configured to determine the intermediate pressure of the air conditioning unit according to the opening of the internal electronic expansion valve, the suction pressure of the compressor, and the exhaust superheat degree when the air conditioning unit is in the cooling operation mode; or, the determining the intermediate pressure of the air conditioning unit according to the indoor unit superheat degree, the compressor suction pressure and the exhaust superheat degree comprises: if the opening degree of the internal machine electronic expansion valve is smaller than the preset value of the opening degree of the internal machine electronic expansion valve or the superheat degree of the internal machine is smaller than the preset value of the superheat degree of the internal machine, and meanwhile, the suction pressure of the compressor is smaller than the preset value of the suction pressure of the compressor and the exhaust superheat degree is larger than the preset value of the exhaust superheat degree, the middle pressure of the air conditioning unit is judged to be too small; and if the opening degree of the internal machine electronic expansion valve is greater than the preset value of the opening degree of the internal machine electronic expansion valve or the superheat degree of the internal machine is greater than the preset value of the superheat degree of the internal machine, and meanwhile, the suction pressure of the compressor is greater than the preset value of the suction pressure of the compressor and the exhaust superheat degree is less than the preset value of the exhaust superheat degree, judging that the intermediate pressure of the air conditioning unit is too large.
In one embodiment, the intermediate pressure determining module 403 is specifically configured to determine the intermediate pressure of the air conditioning unit according to the supercooling degree of the internal unit, the suction pressure of the compressor, and the exhaust superheat degree when the air conditioning unit is in the heating operation mode, and further includes: if the supercooling degree of the indoor unit is smaller than the preset supercooling degree value of the indoor unit, and meanwhile, the suction pressure of the compressor is smaller than the preset suction pressure value of the compressor and the exhaust superheat degree is larger than the preset exhaust superheat degree value, the intermediate pressure of the air conditioning unit is judged to be too large; and if the supercooling degree of the indoor unit is greater than the preset supercooling degree value of the indoor unit, and meanwhile, the suction pressure of the compressor is greater than the preset suction pressure value of the compressor and the exhaust superheat degree is less than the preset exhaust superheat degree value, determining that the intermediate pressure of the air conditioning unit is too small.
In one embodiment, the intermediate pressure control module 404 is specifically configured to, when a system operation mode of the current operation of the air conditioning unit is in a cooling operation mode, adjust an opening of an external unit electronic expansion valve when an intermediate pressure of the air conditioning unit is too small, so that the opening of the external unit electronic expansion valve is increased, and the intermediate pressure is increased; and when the intermediate pressure of the air conditioning unit is overlarge, adjusting the opening of the outer machine electronic expansion valve to reduce the opening of the outer machine electronic expansion valve, so that the intermediate pressure is reduced.
In one embodiment, the intermediate pressure control module 404 is specifically configured to, when a system operation mode of the current operation of the air conditioning unit is in a heating operation mode, and when the intermediate pressure of the air conditioning unit is too high, adjust an opening degree of an internal electronic expansion valve, so that the opening degree of the internal electronic expansion valve is decreased, and the intermediate pressure is reduced; when the intermediate pressure of the air conditioning unit is too small, the opening degree of the internal electronic expansion valve is adjusted, so that the opening degree of the internal electronic expansion valve is increased, and the intermediate pressure is increased.
For specific limitations of the pressure control system of the air conditioning unit, reference may be made to the above limitations of the pressure control method of the air conditioning unit, which are not described herein again. All or part of each module in the pressure control system of the air conditioning unit can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which shall fall within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A pressure control method of an air conditioning unit is characterized by comprising the following steps:
judging a system operation mode of the current operation of the air conditioning unit, wherein the system operation mode comprises a refrigeration operation mode and a heating operation mode;
acquiring a plurality of system parameters of the air conditioning unit according to the system operation mode of the current operation of the air conditioning unit, wherein the method comprises the following steps: when the system operation mode of the current operation of the air conditioning unit is in a refrigeration operation mode, acquiring the temperature of an inner machine outlet pipe, the temperature of an inner machine inlet pipe, the exhaust temperature of a compressor, the suction pressure of the compressor and the exhaust pressure of the compressor of the air conditioning unit; or acquiring the exhaust temperature of a compressor of the air conditioning unit, the opening of an internal machine electronic expansion valve, the suction pressure of the compressor and the exhaust pressure of the compressor;
determining an intermediate pressure of the air conditioning unit according to the plurality of system parameters, comprising:
obtaining the superheat degree of the inner machine of the air conditioning unit according to the outlet pipe temperature of the inner machine and the inlet pipe temperature of the inner machine;
obtaining the exhaust superheat degree of the air conditioning unit according to the exhaust temperature of the compressor and the exhaust pressure of the compressor;
determining the intermediate pressure of the air conditioning unit according to the opening of the electronic expansion valve of the indoor unit, the suction pressure of the compressor and the exhaust superheat degree; or, the determining the intermediate pressure of the air conditioning unit according to the indoor unit superheat degree, the compressor suction pressure and the exhaust superheat degree comprises: if the opening degree of the internal machine electronic expansion valve is smaller than the preset value of the opening degree of the internal machine electronic expansion valve or the superheat degree of the internal machine is smaller than the preset value of the superheat degree of the internal machine, and meanwhile, the suction pressure of the compressor is smaller than the preset value of the suction pressure of the compressor and the exhaust superheat degree is larger than the preset value of the exhaust superheat degree, the middle pressure of the air conditioning unit is judged to be too small; if the opening degree of the inner machine electronic expansion valve is larger than the preset value of the opening degree of the inner machine electronic expansion valve or the superheat degree of the inner machine is larger than the preset value of the superheat degree of the inner machine, and meanwhile, the suction pressure of the compressor is larger than the preset value of the suction pressure of the compressor and the exhaust superheat degree is smaller than the preset value of the exhaust superheat degree, the middle pressure of the air conditioning unit is judged to be overlarge;
and adjusting the opening of an electronic expansion valve of the air conditioning unit according to the intermediate pressure of the air conditioning unit, and controlling the intermediate pressure of the air conditioning unit.
2. The method of claim 1, wherein the adjusting the opening of the electronic expansion valve of the air conditioning unit according to the intermediate pressure of the air conditioning unit to control the intermediate pressure of the air conditioning unit comprises:
when the intermediate pressure of the air conditioning unit is too small, adjusting the opening of an external machine electronic expansion valve to increase the opening of the external machine electronic expansion valve, and improving the intermediate pressure of the air conditioning unit;
when the intermediate pressure of the air conditioning unit is too high, the opening degree of the outer machine electronic expansion valve is adjusted, so that the opening degree of the outer machine electronic expansion valve is reduced, and the intermediate pressure of the air conditioning unit is reduced.
3. The method of claim 1, wherein the obtaining a plurality of system parameters of the air conditioning unit according to a system operation mode in which the air conditioning unit is currently operating further comprises:
and when the current running system running mode of the air conditioning unit is in a heating running mode, obtaining the outlet pipe temperature of an internal unit of the air conditioning unit, the exhaust temperature of a compressor, the suction pressure of the compressor and the exhaust pressure of the compressor.
4. The method of claim 3, wherein determining an intermediate pressure of the air conditioning pack based on the plurality of system parameters further comprises:
obtaining the supercooling degree of the inner machine of the air conditioning unit according to the exhaust pressure of the compressor and the outlet pipe temperature of the inner machine;
obtaining the exhaust superheat degree of the air conditioning unit according to the exhaust temperature of the compressor and the exhaust pressure of the compressor;
and judging the intermediate pressure of the air conditioning unit according to the supercooling degree of the internal unit, the suction pressure of the compressor and the exhaust superheat degree.
5. The method of claim 4, wherein determining the intermediate pressure of the air conditioning unit based on the indoor unit subcooling degree, the compressor suction pressure and the exhaust superheat degree, further comprises:
if the supercooling degree of the indoor unit is smaller than the preset supercooling degree value of the indoor unit, and meanwhile, the suction pressure of the compressor is smaller than the preset suction pressure value of the compressor and the exhaust superheat degree is larger than the preset exhaust superheat degree value, the intermediate pressure of the air conditioning unit is judged to be too large;
and if the supercooling degree of the indoor unit is greater than the preset supercooling degree value of the indoor unit, and meanwhile, the suction pressure of the compressor is greater than the preset suction pressure value of the compressor and the exhaust superheat degree is less than the preset exhaust superheat degree value, determining that the intermediate pressure of the air conditioning unit is too small.
6. The method of claim 5, wherein the adjusting the opening of the electronic expansion valve of the air conditioning unit according to the intermediate pressure of the air conditioning unit to control the intermediate pressure of the air conditioning unit further comprises:
when the intermediate pressure of the air conditioning unit is too high, the opening degree of an internal electronic expansion valve is adjusted, so that the opening degree of the internal electronic expansion valve is reduced, and the intermediate pressure is reduced;
when the intermediate pressure of the air conditioning unit is too small, the opening degree of the internal electronic expansion valve is adjusted, so that the opening degree of the internal electronic expansion valve is increased, and the intermediate pressure is increased.
7. A pressure control system for an air conditioning unit, the system comprising:
an operation mode judgment module: the system operation mode judging unit is used for judging the current operation system operation mode of the air conditioning unit, and the system operation mode comprises a refrigeration operation mode and a heating operation mode;
a system parameter acquisition module: the system comprises a control unit, a data processing unit and a data processing unit, wherein the control unit is used for acquiring a plurality of system parameters of the air conditioning unit according to a system operation mode of the current operation of the air conditioning unit;
the system parameter acquisition module is specifically used for acquiring the temperature of an inner machine outlet pipe, the temperature of an inner machine inlet pipe, the exhaust temperature of a compressor, the suction pressure of the compressor and the exhaust pressure of the compressor of the air conditioning unit when the system operation mode of the current operation of the air conditioning unit is in a refrigeration operation mode; or acquiring the exhaust temperature of a compressor of the air conditioning unit, the opening of an internal machine electronic expansion valve, the suction pressure of the compressor and the exhaust pressure of the compressor;
an intermediate pressure determination module: the system is used for judging the intermediate pressure of the air conditioning unit according to the system parameters;
the intermediate pressure judging module is specifically used for obtaining the indoor unit superheat degree of the air conditioning unit according to the indoor unit outlet pipe temperature and the indoor unit inlet pipe temperature; obtaining the exhaust superheat degree of the air conditioning unit according to the exhaust temperature of the compressor and the exhaust pressure of the compressor; determining the intermediate pressure of the air conditioning unit according to the opening of the electronic expansion valve of the indoor unit, the suction pressure of the compressor and the exhaust superheat degree; or judging the intermediate pressure of the air conditioning unit according to the superheat degree of the indoor unit, the suction pressure of the compressor and the exhaust superheat degree;
the intermediate pressure judging module is further used for judging that the intermediate pressure of the air conditioning unit is too small if the opening degree of the inner machine electronic expansion valve is smaller than the preset value of the opening degree of the inner machine electronic expansion valve or the superheat degree of the inner machine is smaller than the preset value of the superheat degree of the inner machine, and meanwhile, the suction pressure of the compressor is smaller than the preset value of the suction pressure of the compressor and the exhaust superheat degree is larger than the preset value of the exhaust superheat degree; if the opening degree of the inner machine electronic expansion valve is larger than the preset value of the opening degree of the inner machine electronic expansion valve or the superheat degree of the inner machine is larger than the preset value of the superheat degree of the inner machine, and meanwhile, the suction pressure of the compressor is larger than the preset value of the suction pressure of the compressor and the exhaust superheat degree is smaller than the preset value of the exhaust superheat degree, the middle pressure of the air conditioning unit is judged to be overlarge;
an intermediate pressure control module: and the electronic expansion valve is used for adjusting the opening of the electronic expansion valve of the air conditioning unit according to the intermediate pressure of the air conditioning unit and controlling the intermediate pressure of the air conditioning unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810783906.3A CN108870689B (en) | 2018-07-17 | 2018-07-17 | Pressure control method and system of air conditioning unit |
| PCT/CN2018/120759 WO2020015285A1 (en) | 2018-07-17 | 2018-12-13 | Method and system for controlling pressure of air conditioning unit, and computer device and storage medium |
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| CN201810783906.3A CN108870689B (en) | 2018-07-17 | 2018-07-17 | Pressure control method and system of air conditioning unit |
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| WO2020015285A1 (en) | 2020-01-23 |
| CN108870689A (en) | 2018-11-23 |
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