CN110410944B - Pressure control method and device of air conditioner and air conditioner - Google Patents
Pressure control method and device of air conditioner and air conditioner Download PDFInfo
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- CN110410944B CN110410944B CN201910667356.3A CN201910667356A CN110410944B CN 110410944 B CN110410944 B CN 110410944B CN 201910667356 A CN201910667356 A CN 201910667356A CN 110410944 B CN110410944 B CN 110410944B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
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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
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Air Conditioning Control Device (AREA)
Abstract
The invention provides a pressure control method and a control device of an air conditioner and the air conditioner, wherein the pressure control method of the air conditioner comprises the following steps: step S1, detecting the operation mode of the air conditioner; step S2, detecting the exhaust pressure and the return pressure of the compressor in the air conditioner; and step S3, controlling the rotating speed of an outer fan and an inner fan in the air conditioner according to the operation mode of the air conditioner, the exhaust pressure and the return pressure. The invention continuously detects the running pressure of the unit, and correspondingly adjusts the rotating speed of the outer fan or the inner fan according to the comparison between the exhaust pressure and the return pressure and the preset value, so that the running pressure of the unit is in a proper range value, and the phenomenon of trip of the unit caused by high-voltage protection or low-voltage protection is prevented. And the control method has high accuracy, no delay, simplicity and reliability.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a pressure control method and a pressure control device of an air conditioner and the air conditioner.
Background
In order to pursue performance maximization, the operating pressure of most fixed-frequency air conditioners is high, especially in a T3 working condition area or summer with high outside temperature, the environmental temperature is severe, the operating pressure of the air conditioners is high, and when the pressure exceeds a pressure switch protection value, a unit is shut down due to high-voltage protection, so that the use experience and the comfort of a user are influenced; and the system pressure is too high before the air conditioner is shut down, the compressor can be damaged, and the service life and the reliability of the air conditioner are further influenced.
Disclosure of Invention
The invention solves the problems that the running pressure of the existing air conditioner can not be effectively controlled, and the unit can generate the trip phenomenon due to high-pressure or high-temperature protection, thereby further influencing the use experience and comfort of users and reducing the service life and reliability of the air conditioner.
To solve at least one aspect of the above problems, the present invention provides a pressure control method of an air conditioner, including:
step S1, detecting the operation mode of the air conditioner;
step S2, detecting the exhaust pressure and the return pressure of the compressor in the air conditioner;
and step S3, controlling the rotating speed of an outer fan and an inner fan in the air conditioner according to the operation mode of the air conditioner, the exhaust pressure and the return pressure.
The invention continuously detects the running pressure of the unit, and correspondingly adjusts the rotating speed of the outer fan or the inner fan according to the comparison between the exhaust pressure and the return pressure and the preset value, so that the running pressure of the unit is in a proper range value, and the phenomenon of trip of the unit caused by high-voltage protection or low-voltage protection is prevented. And the control method has high accuracy, no delay, simplicity and reliability.
Optionally, step S3 further includes: when the air conditioner operates in a refrigeration mode, the rotating speeds of the outer fan and the inner fan are controlled according to the exhaust pressure and the return pressure, and the method specifically comprises the following steps:
step S31, if the exhaust pressure is detected to be less than or equal to a first refrigeration preset exhaust pressure and the return pressure is detected to be greater than or equal to a first preset return pressure, the outer fan runs at a first outer fan preset rotating speed, and the inner fan adjusts the rotating speed according to a first control method;
step S32, if the exhaust pressure is detected to be greater than the first refrigeration preset exhaust pressure and less than a second refrigeration preset exhaust pressure, the outer fan operates at a preset rotating speed greater than that of the first outer fan, and the inner fan operates at a preset rotating speed less than that of the second inner fan;
step S33, if the exhaust pressure is detected to be greater than or equal to a second refrigeration preset exhaust pressure and less than a third refrigeration preset exhaust pressure, the outer fan runs at a second outer fan preset rotating speed, and the inner fan adjusts the rotating speed according to a second control method;
and step S34, if the discharge pressure is detected to be greater than or equal to the third refrigeration preset discharge pressure and continues for the first preset time, controlling the compressor to stop running.
The invention respectively adjusts the pressure under the low-temperature refrigeration working condition and the high-temperature refrigeration working condition, so that the operation of the air conditioner is in a proper range. When the unit pressure is at a lower level, the risk of liquid return is reduced on the premise of not influencing the comfort of a user by forcing the lowest windshield of the outer fan to operate and the highest windshield of the inner fan to operate. When the unit pressure is in a higher level, the indoor side heat exchange effect is reduced by reducing the rotating speed of the inner fan, so that the heat load of the unit is reduced, and the pressure of the unit is reduced.
Optionally, the step S31, where "the inner fan performs speed adjustment according to the first control method", includes:
step S311, if the exhaust pressure is detected to be less than or equal to a first refrigeration preset exhaust pressure and greater than a fourth refrigeration preset exhaust pressure, and the return air pressure is greater than or equal to a first preset return air pressure and less than a second preset return air pressure, maintaining the current rotating speed of the inner fan;
step S312, if it is detected that the discharge pressure is less than or equal to a fourth refrigeration preset discharge pressure and the return pressure is greater than or equal to a second preset return pressure, the inner fan operates at a second inner fan preset rotation speed.
The invention adjusts the pressure of the air conditioner under a lower pressure level, properly reduces the filling amount of the refrigerant in the evaporator by operating the lowest gear of the external fan, and further reduces the risk of liquid return as much as possible under the condition of not influencing the use feeling of a user. The highest windshield of the inner fan runs to improve the system pressure and the return air temperature, so that the liquid return phenomenon is prevented.
Optionally, the step S33, where "the inner fan performs speed adjustment according to the second control method", includes:
step S331, if the exhaust pressure is detected to be greater than or equal to the second refrigeration preset exhaust pressure and less than a fifth refrigeration preset exhaust pressure, maintaining the current rotating speed of the inner fan;
step S332, if the exhaust pressure is detected to be greater than or equal to the fifth refrigeration preset exhaust pressure and less than a sixth refrigeration preset exhaust pressure, reducing a preset rotating speed of the inner fan;
step S333, if the exhaust pressure is detected to be greater than or equal to a sixth refrigeration preset exhaust pressure and smaller than a third refrigeration preset exhaust pressure, the inner fan operates at a first inner fan preset rotating speed.
The invention adjusts the pressure of the air conditioner under higher pressure level, reduces the heat exchange quantity of the refrigerant and the air at the indoor side, reduces the pressure at the evaporation side and the return air temperature by reducing the rotating speed of the inner fan, and reduces the temperature of the refrigerant discharged by the compressor, thereby reducing the heat load of the unit and the pressure of the unit.
Optionally, before the step S332, before the step of reducing the predetermined rotation speed of the inner fan, the method further includes: and detecting the current rotating speed of the inner fan, comparing the current rotating speed with the preset rotating speed of the first inner fan, and controlling the inner fan to reduce the preset rotating speed if the current rotating speed of the inner fan is greater than the preset rotating speed of the first inner fan.
Therefore, the inner fan is ensured to operate at a lower rotating speed.
Optionally, after "the inner fan reduces the predetermined rotation speed" in step S332, the method further includes: and detecting first running time after the inner fan reduces the preset rotating speed, comparing the first running time with second preset time, and repeating the steps S2 and S3 if the first running time reaches the second preset time.
Therefore, the rotating speed of the inner fan is continuously reduced to reduce the heat load of the unit, and further reduce the pressure of the unit.
Optionally, after step S332 and step S333, the method further includes: and detecting whether the exhaust pressure is smaller than a seventh refrigeration preset exhaust pressure, if so, restoring the set windshield by the inner fan, otherwise, repeating the step S332 or the step S333, wherein the seventh refrigeration preset exhaust pressure is smaller than the fifth refrigeration preset exhaust pressure.
Therefore, when the pressure is adjusted to be within the preset range, the operation of the inner fan is recovered in time, so that the pressure of the unit can be stably controlled within a proper range.
Optionally, after step S34, the method further includes: and detecting whether the exhaust pressure is less than an eighth preset refrigeration exhaust pressure and whether the compressor meets an over-protection condition, if so, starting the compressor, otherwise, continuing to stop running, wherein the eighth preset refrigeration exhaust pressure is less than the fifth preset refrigeration exhaust pressure.
Therefore, normal operation of the unit is recovered in time, and the reduction of the experience of user comfort is avoided.
Optionally, step S3 further includes: when the air conditioner operates in a heating mode, the rotating speeds of the outer fan and the inner fan are controlled according to the exhaust pressure, and the method specifically comprises the following steps:
step S3-1, if the exhaust pressure is less than a first heating preset exhaust pressure, the outer fan adjusts the rotating speed according to a third control method;
step S3-2, if the exhaust pressure is greater than or equal to the first heating preset exhaust pressure and less than a second heating preset exhaust pressure, the operation of the outer fan is stopped, and the inner fan operates at a second inner fan preset rotating speed;
and step S3-3, if the exhaust pressure is greater than or equal to the second heating preset exhaust pressure and lasts for a third preset time, controlling the compressor to stop operating.
In the heating mode, the pressure of the unit is reduced by reducing the rotating speed of the outer fan, so that the pressure of the unit can be maintained in a proper range, and the inner fan is controlled to run at the highest windshield after the outer fan stops running, so that the performance of the unit is ensured.
Optionally, the step S3-1 of "the outer fan adjusts the rotation speed according to the third control method" includes:
step S3-11, if the exhaust pressure is less than a third heating preset exhaust pressure, the outer fan operates at a second outer fan preset rotating speed;
step S3-12, if the exhaust pressure is greater than or equal to the third heating preset exhaust pressure and less than a fourth heating preset exhaust pressure, the outer fan operates at a third outer fan preset rotation speed which is less than the second outer fan preset rotation speed;
step S3-13, if the exhaust pressure is greater than or equal to the fourth heating preset exhaust pressure and less than a fifth heating preset exhaust pressure, the outer fan operates at a fourth outer fan preset rotation speed which is less than the third outer fan preset rotation speed;
and step S3-14, if the exhaust pressure is greater than or equal to the fifth heating preset exhaust pressure and less than the first heating preset exhaust pressure, stopping the operation of the external fan.
The rotating speed of the outer fan is reduced to reduce the pressure of the unit, so that the pressure of the unit can be maintained in a proper range, and the performance of the unit is ensured.
Optionally, after step S3-2, the method further includes: and detecting whether the exhaust pressure is smaller than a fourth heating preset exhaust pressure or not, if so, recovering the setting of the windshield by the inner fan, and otherwise, repeating the step S3.
Therefore, the operation of the inner fan is recovered in time, and the pressure of the unit can be stably controlled within a proper range.
Optionally, after step S3-3, the method further includes: and detecting whether the exhaust pressure is less than a sixth heating preset exhaust pressure or not, and whether the compressor meets an over-protection condition or not, if so, starting the compressor, otherwise, continuing to stop running, wherein the sixth heating preset exhaust pressure is less than the third heating preset exhaust pressure.
Therefore, normal operation of the unit is recovered in time, and the reduction of the experience of user comfort is avoided.
The present invention also provides a pressure control apparatus of an air conditioner, comprising:
the outer fan and the inner fan are used for respectively radiating heat of an outdoor heat exchanger and an indoor heat exchanger of the air conditioner;
the detection unit is used for detecting the exhaust pressure and the return pressure of a compressor in the air conditioner;
the control unit is used for respectively controlling the rotating speeds of the outer fan and the inner fan under different operation modes of the air conditioner according to the exhaust pressure and the return pressure;
the control unit is respectively in communication connection with the outer fan, the inner fan and the detection unit.
The invention also provides an air conditioner, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium is used for storing a computer program, and the computer program is read by the processor and runs to realize the pressure control method of the air conditioner.
The present invention provides a computer-readable storage medium storing a computer program which, when read and executed by a processor, implements a pressure control method of an air conditioner as set forth in any one of the above
The invention detects the running pressure of the unit and adjusts the rotating speed of the outer fan and the inner fan, thereby leading the running pressure of the unit to be in a proper range value, preventing the unit from tripping caused by high-voltage protection and low-voltage protection, improving the reliability of the compressor, enlarging the application range of the air conditioner and realizing the purpose of continuous refrigeration and heating in severe environment.
Drawings
FIG. 1 is a general flowchart of a pressure control method of an air conditioner according to the present invention;
FIG. 2 is a flow chart of pressure control of the air conditioner in the cooling mode according to the present invention;
fig. 3 is a flow chart of pressure control of the air conditioner in the heating mode according to the present invention.
Detailed Description
The high-low pressure protection control mode of current air conditioner is generally to install pressure switch on the air conditioner, when the pressure of unit reaches pressure threshold value under abominable operating mode, can trigger pressure switch action, and the unit stops, and system pressure is too high before shutting down, can cause the damage to the compressor, influences the unit reliability to influence user and use experience and travelling comfort.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1, the present invention provides a pressure control method of an air conditioner, including:
step S1, detecting the operation mode of the air conditioner;
step S2, detecting the exhaust pressure and return pressure of the compressor in the air conditioner;
and step S3, controlling the rotating speed of the outer fan and the inner fan in the air conditioner according to the operation mode, the exhaust pressure and the return pressure of the air conditioner.
The invention optimizes the pressure protection mode of the air conditioner, and correspondingly adjusts the rotating speed of the outer fan or the inner fan by continuously detecting the running pressure of the unit and comparing the exhaust pressure and the return pressure with the preset value, so that the running pressure of the unit is in a proper range value, and the phenomenon of trip of the unit caused by high-pressure protection or low-pressure protection is prevented.
The operation modes of the air conditioner comprise a cooling mode and a heating mode, and the air conditioner also comprises other operation modes such as dehumidification, defrosting and the like besides the cooling mode and the heating mode, and the other operation modes have less time and the pressure state of the air conditioner does not change obviously when the air conditioner operates in other modes.
As shown in fig. 2, when it is detected that the air conditioner operates in the cooling mode, the rotation speeds of the outer fan and the inner fan are controlled according to the discharge pressure and the return pressure, and the specific steps are as follows:
step S31, if the exhaust pressure is detected to be less than or equal to a first refrigeration preset exhaust pressure and the return pressure is detected to be greater than or equal to a first preset return pressure, the outer fan runs at a first outer fan preset rotating speed, and the inner fan adjusts the rotating speed according to a first control method;
step S32, if the exhaust pressure is detected to be greater than the first refrigeration preset exhaust pressure and less than the second refrigeration preset exhaust pressure, the outer fan operates at a speed greater than the first outer fan preset speed, and the inner fan operates at a speed less than the second inner fan preset speed;
step S33, if the exhaust pressure is detected to be greater than or equal to the second refrigeration preset exhaust pressure and less than the third refrigeration preset exhaust pressure, the outer fan runs at the second outer fan preset rotating speed, and the inner fan adjusts the rotating speed according to the second control method;
and step S34, if the discharge pressure is greater than or equal to the third refrigeration preset discharge pressure and continues for the first preset time, controlling the compressor to stop running.
In air conditioning system, the heat transfer area of general outside condenser is obviously greater than the heat transfer area of interior machine evaporator, under the low temperature refrigeration operating mode, when opening the refrigeration mode, can be because outdoor side heat transfer effect is far greater than indoor side heat transfer effect, leads to the refrigerant temperature lower before the throttle, and the refrigerant does not evaporate completely in the evaporimeter, leads to the compressor to return liquid and takes place the liquid attack phenomenon even, damages the compressor. For a fixed-frequency air conditioner, a throttling device generally adopts a capillary tube, and the frequency of a compressor is constant, so that the aim of reducing the flow rate of a refrigerant cannot be fulfilled by controlling the throttling rate or reducing the frequency of the compressor. In order to prevent the phenomenon of liquid return and even liquid impact of the compressor, the conventional scheme generally combines an external machine with a PG motor by adopting silicon controlled speed regulation power, and reduces the heat exchange quantity outside the outdoor machine by reducing the rotating speed of an external fan, so that the aim of preventing liquid impact under the low-temperature refrigeration working condition is fulfilled. The invention directly detects the exhaust pressure and the return pressure, directly adjusts the rotating speed of the inner fan or the outer fan through comparison and judgment with a set value, ensures that the running pressure of the unit is in a proper range, has high accuracy and no delay, and is simple and reliable.
In step S31, under the low-temperature refrigeration condition, when it is detected that the exhaust pressure is lower than the first refrigeration preset exhaust pressure and the return pressure is higher than the first preset return pressure, the external fan is controlled to operate at the first external fan preset rotation speed, where the first external fan preset rotation speed may be a lower rotation speed of the external fan, and the lowest windshield of the external fan is preferred. Therefore, the lowest-gear operation of the external fan can properly reduce the filling amount of the refrigerant in the evaporator, and further reduce the liquid return risk as much as possible under the condition of not influencing the use feeling of a user. The first refrigeration preset exhaust pressure can be 2.3Mpa, the first preset return pressure can be 1.1Mpa, the main reason is that under the low-temperature refrigeration working condition, the outside condensing pressure of the system can be reduced due to the lower outside working condition, the exhaust temperature and the exhaust pressure can be reduced, and the return pressure and the return temperature can be increased, but when the return pressure reaches 1.2MPa, the corresponding saturation temperature is 14 ℃, and at the moment, if the return temperature is lower than the temperature, the liquid return and liquid impact phenomena of the compressor can be easily caused, so that the lowest wind gear of the external fan operates when Pd is less than or equal to 2.3MPa and Ph is greater than or equal to 1.1MPa, and the risk of liquid return can be reduced as much as possible under the condition that the use feeling of a user is not influenced.
Further, if the exhaust pressure is detected to be less than or equal to the fourth refrigeration preset exhaust pressure and the return pressure is detected to be greater than or equal to the second preset return pressure, the inner fan operates at the second inner fan preset rotating speed. The fourth refrigeration preset exhaust pressure is smaller than the first refrigeration preset exhaust pressure, and the second preset return air pressure is larger than the first preset return air pressure. Under the condition that the exhaust pressure is lower than the first refrigeration preset exhaust pressure and the return pressure is higher than the first preset return pressure, the outer fan operates according to the lowest wind gear, but after the outer fan operates according to the lowest gear, if the exhaust pressure is detected to be reduced, the inner fan is forced to operate according to the second inner fan preset rotating speed, wherein the second inner fan preset rotating speed can be the higher rotating speed of the inner fan. Wherein, the fourth refrigeration preset exhaust pressure can be 2.2Mpa, and the second preset return air pressure can be 1.2 Mpa.
It should be noted that, when it is detected that the discharge pressure is less than or equal to the first refrigeration preset discharge pressure and greater than the fourth refrigeration preset discharge pressure, and the return pressure is greater than or equal to the first preset return pressure and less than the second preset return pressure, the inner fan maintains the current rotation speed.
In step S33, when the exhaust pressure is detected to be greater than or equal to the second preset exhaust pressure for refrigeration and less than the third preset exhaust pressure for refrigeration, the outer fan operates at the preset rotation speed of the second outer fan, and the inner fan adjusts the rotation speed according to the second control method. And the second refrigeration preset exhaust pressure is greater than the first refrigeration preset exhaust pressure. The preset rotating speed of the second outer fan can be the higher rotating speed of the outer fan, and the highest windshield of the outer fan is preferably selected, so that the best heat exchange condition can be ensured on the outer side to achieve the maximum heat exchange quantity of the outdoor unit, the running pressure of the system is effectively reduced, and the energy efficiency of the air conditioner can be exerted to the maximum.
The rotating speed adjustment of the inner fan is carried out according to a second control method, and the method specifically comprises the following steps:
step S331, when the exhaust pressure is detected to be greater than or equal to the second refrigeration preset exhaust pressure and less than the fifth refrigeration preset exhaust pressure, maintaining the current rotating speed of the inner fan; and the fifth refrigeration preset exhaust pressure is smaller than the third refrigeration preset exhaust pressure. At the moment, only the outer fan runs at the preset rotating speed of the second outer fan, and the system pressure is effectively reduced by improving the heat exchange quantity of the outdoor unit. Wherein, the second refrigeration preset exhaust pressure can be 3.0Mpa, and the fifth refrigeration preset exhaust pressure can be 3.8 Mpa.
In step S332, when it is detected that the discharge pressure is greater than or equal to the fifth refrigeration preset discharge pressure and less than the sixth refrigeration preset discharge pressure, the sixth refrigeration preset discharge pressure is also less than the third refrigeration preset discharge pressure. Wherein, the sixth refrigeration preset exhaust pressure can be 4.0 Mpa. At the moment, detecting the current rotating speed of the inner fan and comparing the current rotating speed with a first preset rotating speed of the inner fan, wherein the first preset rotating speed of the inner fan can be the lower rotating speed of the inner fan, the invention preferably selects the lowest windshield of the inner fan, if the current rotating speed of the inner fan is greater than the preset rotating speed of the first inner fan, the inner fan is controlled to reduce the preset rotating speed, the first running time after the preset rotating speed of the inner fan is detected, the first running time is compared with the second preset time, if the first running time reaches the second preset time, the exhaust pressure is detected, if the exhaust pressure is still met and is greater than or equal to a fifth preset exhaust pressure for refrigeration and less than a sixth preset exhaust pressure for refrigeration, the rotating speed of the inner fan is reduced again until the preset rotating speed of the first inner fan is reduced, if the conditions are still met, the inner fan is maintained to operate at the preset rotating speed of the first inner fan until the exhaust pressure is detected to be less than a seventh preset exhaust pressure for refrigeration, and if the seventh refrigeration preset exhaust pressure is lower than the fifth refrigeration preset exhaust pressure and can be 3.6Mpa, the inner fan recovers to set the windshield.
And step S333, when the exhaust pressure is detected to be greater than or equal to the sixth refrigeration preset exhaust pressure and smaller than the third refrigeration preset exhaust pressure, controlling the inner fan to operate at the first inner fan preset rotating speed until the exhaust pressure is smaller than the seventh refrigeration preset exhaust pressure, and controlling the inner fan to recover the set windshield. The preset exhaust pressure of the third refrigeration can be 4.2Mpa, at the moment, the indoor side heat exchange amount is reduced by operating the inner fan with the lowest windshield, the system pressure is further reduced until the exhaust pressure is reduced to be lower than the preset exhaust pressure of the seventh refrigeration, and the inner fan is recovered to set the windshield.
In the refrigeration mode, when the exhaust pressure is greater than or equal to the second refrigeration preset exhaust pressure and less than the third refrigeration preset exhaust pressure, the rotation speed of the inner fan is reduced, the heat exchange quantity of the refrigerant and the air at the indoor side can be reduced, the pressure at the evaporation side is reduced, the return air temperature is reduced, the temperature of the refrigerant discharged by the compressor is also reduced, the heat load of the unit is further reduced, and the pressure of the unit is reduced.
It should be noted that, when the detected exhaust pressure is greater than the first preset exhaust pressure for cooling and less than the second preset exhaust pressure for cooling, the present invention controls the outer fan to operate at a speed greater than the preset speed of the first outer fan and the inner fan to operate at a speed less than the preset speed of the second inner fan according to step S32, so that the system pressure is maintained within a proper range.
In step S34, the method controls the compressor to stop operating when the discharge pressure is detected to be greater than or equal to the third preset discharge pressure for the first preset time. Wherein the first predetermined time is set to 25-35s, preferably 30 s.
After the compressor stops running, the conditions for restarting the compressor are as follows: and detecting that the exhaust pressure is less than an eighth refrigeration preset exhaust pressure, wherein the compressor meets an over-protection restarting condition, and the eighth refrigeration preset exhaust pressure is less than a fifth refrigeration preset exhaust pressure. The eighth preset refrigeration exhaust pressure can be 3.4 MPa. The compressor protection conditions refer to protection conditions of the compressor, such as overload protection and overcurrent protection, starting protection after half an hour of high-temperature trip, starting protection after three minutes after shutdown and the like. It should be noted that the selection of the pressure data in the second refrigeration preset exhaust pressure, the fifth refrigeration preset exhaust pressure, the sixth refrigeration preset exhaust pressure, the third refrigeration preset exhaust pressure, the seventh refrigeration preset exhaust pressure and the eighth refrigeration preset exhaust pressure is obtained by integrating the test data, combining the pressure-enthalpy diagram, and by theoretical analysis, considering the performance of the common R32 refrigerant compressor and the R410a refrigerant compressor.
The practical application steps of the invention in the refrigeration mode are as follows:
detecting exhaust pressure Pd and return pressure Ph;
comparing the exhaust pressure with a refrigeration preset exhaust pressure, and comparing the return pressure with a preset return pressure; the refrigeration preset exhaust pressure comprises a first refrigeration preset exhaust pressure, a second refrigeration preset exhaust pressure, a third refrigeration preset exhaust pressure, a fourth refrigeration preset exhaust pressure, a fifth refrigeration preset exhaust pressure, a sixth refrigeration preset exhaust pressure, a seventh refrigeration preset exhaust pressure and an eighth refrigeration preset exhaust pressure; the preset air return pressure comprises a first preset air return pressure and a second preset air return pressure.
If Pd is more than 2.2 and less than or equal to 2.3MPa and Ph is more than or equal to 1.1 and less than 1.2MPa, controlling the lowest windshield of the outer fan to operate, and maintaining the current wind speed of the inner fan;
if Pd is less than or equal to 2.2MPa and Ph is more than or equal to 1.2MPa, controlling the lowest windshield of the outer fan to operate and the highest windshield of the inner fan to operate;
if Pd is more than 2.3 and less than 3.0Mpa, controlling the outer fan to operate at a wind speed higher than the lowest wind gear of the outer fan, and controlling the inner fan to operate at a wind speed lower than the highest wind gear of the inner fan;
if Pd is more than or equal to 3.0 and less than 3.8MPa, controlling the outer fan to operate at the highest windshield, and maintaining the current wind speed of the inner fan;
if Pd is more than or equal to 3.8 and less than 4.0MPa, the outer fan still runs at the highest windshield, the rotating speed of the inner fan is detected, if the rotating speed of the inner fan is not less than the lowest windshield of the inner fan, the rotating speed is reduced by a preset gear speed compared with the current rotating speed of the inner fan, the rotating speed can be processed by one gear reduction, after the gear reduction is carried out for 60S, the exhaust pressure is detected, if the exhaust pressure still meets Pd is more than or equal to 3.8 and less than 4.0MPa, the windshield is reduced again until the lowest windshield of the inner fan is reduced; when Pd is detected to be less than 3.6MPa, the inner machine recovers to set the windshield;
if Pd is more than or equal to 4.0 and less than 4.2MPa, the outer fan still operates at the highest windshield, and the inner fan is controlled to operate at the lowest windshield; and when Pd is detected to be less than 3.6MPa, the inner machine recovers to set the windshield.
If the Pd is more than or equal to 4.2MPa and is continuously 30S, stopping the compressor; and when Pd is less than 3.4MPa and the over-protection restarting condition of the compressor is met, starting the compressor, and recovering the normal operation of the unit.
As shown in fig. 3, when it is detected that the air conditioner operates in the heating mode, the rotation speeds of the outer fan and the inner fan are controlled according to the exhaust pressure, and the specific steps are as follows:
step S3-1, if the exhaust pressure is less than the first heating preset exhaust pressure, the outer fan adjusts the rotating speed according to a third control method;
wherein the "the external fan adjusts the rotation speed according to the third control method" includes:
step S3-11, if the exhaust pressure is less than the third heating preset exhaust pressure, the outer fan operates at a second outer fan preset rotating speed; the preset rotating speed of the second outer fan is preferably the highest windshield of the outer fan; the higher the wind speed of the outer fan is, the larger the heat exchange quantity of the outer fan is, the better the heating effect of the unit is, and the higher the energy efficiency is, so that when the exhaust pressure is lower than the third preset exhaust pressure for heating, the outer fan is controlled to operate according to the highest wind gear to ensure the performance of the unit;
step S3-12, if the exhaust pressure is greater than or equal to the third heating preset exhaust pressure and less than the fourth heating preset exhaust pressure, the outer fan operates at a third outer fan preset rotation speed which is less than the second outer fan preset rotation speed; the invention preferably selects the condition that the outer fan runs according to the middle-grade wind speed;
step S3-13, if the exhaust pressure is greater than or equal to the fourth heating preset exhaust pressure and less than the fifth heating preset exhaust pressure, the outer fan operates at a first outer fan preset rotation speed which is less than the third outer fan preset rotation speed; the invention preferably selects the condition that the outer fan runs according to the lowest wind speed;
and step S3-14, if the exhaust pressure is greater than or equal to the fifth heating preset exhaust pressure and less than the first heating preset exhaust pressure, the operation of the external fan is stopped. And when the exhaust pressure exceeds the third heating preset exhaust pressure, reducing the rotating speed of the outer fan so as to control the pressure of the unit within a certain range.
In the heating mode, when the exhaust pressure is lower than the first heating preset exhaust pressure, the pressure of the unit is not too high, the pressure is controlled by the outer unit only, the rotating speed of the outdoor fan is reduced, the exhaust pressure is controlled within a certain range, and the inner fan operates according to the rotating speed set by a user to ensure the comfort of the user. Wherein, the first heating preset exhaust pressure can be 4.0Mpa, the fifth heating preset exhaust pressure can be 3.8Mpa, the fourth heating preset exhaust pressure can be 3.6Mpa, and the third heating preset exhaust pressure can be 3.4 Mpa. The pressure values can be comprehensively selected through theoretical analysis according to test data and a combined pressure-enthalpy diagram.
Further, in step S3-2, if the exhaust pressure is greater than or equal to the first heating preset exhaust pressure and less than the second heating preset exhaust pressure, the operation of the outer fan is controlled to stop, the inner fan operates at the second inner fan preset rotation speed, and the inner fan resumes the setting of the damper when the exhaust pressure is detected to be less than the fourth heating preset exhaust pressure. Wherein, the second heating preset exhaust pressure can be 4.2 Mpa.
And step S3-3, if the exhaust pressure is greater than or equal to the second heating preset exhaust pressure and continues for a third preset time, at the moment, the unit pressure is too high, and the compressor needs to be controlled to stop running.
After the outer fan of the compressor stops running, the conditions for restarting the compressor and the outer fan are as follows: and detecting that the exhaust pressure is less than a sixth heating preset exhaust pressure, and the compressor meets an over-protection restarting condition, otherwise, the compressor continues to stop running, wherein the sixth heating preset exhaust pressure is less than a third heating preset exhaust pressure.
The practical application steps of the invention in the heating mode are as follows:
detecting exhaust pressure Pd;
and comparing the exhaust pressure with a heating preset exhaust pressure, wherein the heating preset exhaust pressure comprises a first heating preset exhaust pressure, a second heating preset exhaust pressure, a third heating preset exhaust pressure, a fourth heating preset exhaust pressure, a fifth heating preset exhaust pressure and a sixth heating preset exhaust pressure.
If Pd is less than 3.4MPa, controlling the highest windshield of the outer fan to operate;
if Pd is more than or equal to 3.4 and less than 3.6MPa, controlling the middle windshield of the outer fan to operate;
if Pd is more than or equal to 3.6 and less than 3.8MPa, controlling the lowest windshield of the outer fan to operate;
if Pd is more than or equal to 3.8 and less than 4.0MPa, controlling the outer fan to stop running; and when Pd is less than 3.0MPa and the compressor over-protection restarting condition is met, starting the outer fan, and recovering the normal operation of the unit.
If Pd is more than or equal to 4.0 and less than 4.2MPa, controlling the highest windshield of the inner fan to operate; when Pd is detected to be less than 3.6MPa, the inner machine recovers to set the windshield;
if the Pd is more than or equal to 4.2Mpa and lasts for 30s, the compressor stops running; and when Pd is less than 3.0MPa and the over-protection restarting condition of the compressor is met, starting the compressor, and recovering the normal operation of the unit.
The present invention also provides a pressure control apparatus of an air conditioner, comprising:
the outer fan and the inner fan are used for respectively radiating heat of an outdoor heat exchanger and an indoor heat exchanger of the air conditioner;
the detection unit is used for detecting the exhaust pressure and the return pressure of a compressor in the air conditioner;
the control unit respectively controls the rotating speeds of the outer fan and the inner fan under different operation modes of the air conditioner according to the exhaust pressure and the return pressure;
the control unit is respectively in communication connection with the outer fan, the inner fan and the detection unit.
The invention also provides an air conditioner, which comprises the pressure control device of the air conditioner. The detection unit comprises a high-pressure sensor and a low-pressure sensor, the high-pressure sensor is arranged on an exhaust pipe of the compressor, and the low-pressure sensor is arranged on an air return pipe of the compressor.
The air conditioner provided by the invention has the advantages that the running pressure of the unit is detected, and the rotating speeds of the outer fan and the inner fan are adjusted, so that the running pressure of the unit is in a proper range value, the phenomenon of trip of the unit due to high-voltage protection and low-voltage protection is prevented, the reliability of a compressor is improved, the use range of the air conditioner is expanded, and the purpose of continuous refrigeration and heating in severe environment is realized.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (14)
1. A pressure control method of an air conditioner, comprising:
step S1, detecting the operation mode of the air conditioner;
step S2, detecting the exhaust pressure and the return pressure of the compressor in the air conditioner;
step S3, controlling the rotating speed of an outer fan and an inner fan in the air conditioner according to the operation mode of the air conditioner, the exhaust pressure and the return pressure;
when the air conditioner operates in a refrigeration mode, the rotating speeds of the outer fan and the inner fan are controlled according to the exhaust pressure and the return pressure, and the method specifically comprises the following steps:
step S31, under the working condition of low-temperature refrigeration, if the exhaust pressure is detected to be less than or equal to a first refrigeration preset exhaust pressure of 2.3Mpa and the return air pressure is detected to be greater than or equal to a first preset return air pressure of 1.1Mpa, the outer fan runs at a first outer fan preset rotating speed which is the lowest windshield of the outer fan, and the inner fan adjusts the rotating speed according to a first control method; the rotating speed regulation of the inner fan according to a first control method comprises the following steps: if the exhaust pressure is detected to be less than or equal to a fourth refrigeration preset exhaust pressure of 2.2Mpa, and the return air pressure is detected to be greater than or equal to a second preset return air pressure of 1.2Mpa, the inner fan operates at a second inner fan preset rotating speed, and the second inner fan preset rotating speed is the highest windshield of the inner fan;
step S32, if the exhaust pressure is detected to be greater than the first refrigeration preset exhaust pressure and less than a second refrigeration preset exhaust pressure, the outer fan operates at a preset rotating speed greater than that of the first outer fan, and the inner fan operates at a preset rotating speed less than that of the second inner fan;
step S33, if the exhaust pressure is detected to be greater than or equal to a second refrigeration preset exhaust pressure and less than a third refrigeration preset exhaust pressure, the outer fan runs at a second outer fan preset rotating speed, and the inner fan adjusts the rotating speed according to a second control method; wherein, the inner fan carries out rotation speed regulation according to a second control method and comprises the following steps: step S332, if the exhaust pressure is detected to be greater than or equal to a fifth refrigeration preset exhaust pressure and less than a sixth refrigeration preset exhaust pressure, reducing a preset rotating speed of the inner fan;
and step S34, if the discharge pressure is detected to be greater than or equal to the third refrigeration preset discharge pressure and continues for the first preset time, controlling the compressor to stop running.
2. The pressure control method of an air conditioner according to claim 1, wherein the rotating speed adjustment of the inner fan according to the first control method in step S31 further comprises:
step S311, if it is detected that the exhaust pressure is less than or equal to a first refrigeration preset exhaust pressure and greater than a fourth refrigeration preset exhaust pressure, and the return pressure is greater than or equal to a first preset return pressure and less than a second preset return pressure, the inner fan maintains the current rotation speed.
3. The pressure control method of an air conditioner according to claim 1, wherein the rotating speed adjustment of the inner fan according to the second control method in step S33 further comprises:
step S331, if the exhaust pressure is detected to be greater than or equal to the second refrigeration preset exhaust pressure and less than the fifth refrigeration preset exhaust pressure, maintaining the current rotating speed of the inner fan;
step S333, if the exhaust pressure is detected to be greater than or equal to the sixth refrigeration preset exhaust pressure and smaller than the third refrigeration preset exhaust pressure, the inner fan operates at a first inner fan preset rotating speed.
4. The pressure control method of an air conditioner according to claim 3, further comprising, before the internal fan is decelerated at a predetermined rotation speed in step S332: and detecting the current rotating speed of the inner fan, comparing the current rotating speed with the preset rotating speed of the first inner fan, and controlling the inner fan to reduce the preset rotating speed if the current rotating speed of the inner fan is greater than the preset rotating speed of the first inner fan.
5. The pressure control method of an air conditioner according to claim 3, further comprising, after the internal fan decreases the predetermined rotation speed in step S332: and detecting first running time after the inner fan reduces the preset rotating speed, comparing the first running time with second preset time, and repeating the steps S2 and S3 if the first running time reaches the second preset time.
6. The pressure control method of an air conditioner according to claim 3, further comprising, after the steps S332 and S333: and detecting whether the exhaust pressure is smaller than a seventh refrigeration preset exhaust pressure, if so, restoring the set windshield by the inner fan, otherwise, repeating the step S332 or the step S333, wherein the seventh refrigeration preset exhaust pressure is smaller than the fifth refrigeration preset exhaust pressure.
7. The pressure control method of an air conditioner according to claim 3, further comprising, after the step S34: and detecting whether the exhaust pressure is less than an eighth preset refrigeration exhaust pressure and whether the compressor meets an over-protection condition, if so, starting the compressor, otherwise, continuing to stop running, wherein the eighth preset refrigeration exhaust pressure is less than the fifth preset refrigeration exhaust pressure.
8. The pressure control method of an air conditioner according to claim 1, wherein the step S3 further includes: when the air conditioner operates in a heating mode, the rotating speeds of the outer fan and the inner fan are controlled according to the exhaust pressure, and the method specifically comprises the following steps:
step S3-1, if the exhaust pressure is less than a first heating preset exhaust pressure, the outer fan adjusts the rotating speed according to a third control method;
step S3-2, if the exhaust pressure is greater than or equal to the first heating preset exhaust pressure and less than a second heating preset exhaust pressure, the operation of the outer fan is stopped, and the inner fan operates at a second inner fan preset rotating speed;
and step S3-3, if the exhaust pressure is greater than or equal to the second heating preset exhaust pressure and lasts for a third preset time, controlling the compressor to stop operating.
9. The pressure control method of an air conditioner according to claim 8, wherein the adjusting of the rotation speed of the outer fan according to the third control method in step S3-1 includes:
step S3-11, if the exhaust pressure is less than a third heating preset exhaust pressure, the outer fan operates at a second outer fan preset rotating speed;
step S3-12, if the exhaust pressure is greater than or equal to the third heating preset exhaust pressure and less than a fourth heating preset exhaust pressure, the outer fan operates at a third outer fan preset rotation speed which is less than the second outer fan preset rotation speed;
step S3-13, if the exhaust pressure is greater than or equal to the fourth heating preset exhaust pressure and less than a fifth heating preset exhaust pressure, the outer fan operates at a fourth outer fan preset rotation speed which is less than the third outer fan preset rotation speed;
and step S3-14, if the exhaust pressure is greater than or equal to the fifth heating preset exhaust pressure and less than the first heating preset exhaust pressure, stopping the operation of the external fan.
10. The pressure control method of an air conditioner according to claim 8, further comprising, after the step S3-2: and detecting whether the exhaust pressure is smaller than a fourth heating preset exhaust pressure or not, if so, recovering the setting of the windshield by the inner fan, and otherwise, repeating the step S3.
11. The pressure control method of an air conditioner according to claim 9, further comprising, after the step S3-3: and detecting whether the exhaust pressure is less than a sixth heating preset exhaust pressure or not, and whether the compressor meets an over-protection condition or not, if so, starting the compressor, otherwise, continuing to stop running, wherein the sixth heating preset exhaust pressure is less than the third heating preset exhaust pressure.
12. A pressure control apparatus of an air conditioner, comprising:
the outer fan and the inner fan are used for respectively radiating heat of an outdoor heat exchanger and an indoor heat exchanger of the air conditioner;
the detection unit is used for detecting the exhaust pressure and the return pressure of a compressor in the air conditioner;
the control unit is used for respectively controlling the rotating speeds of the outer fan and the inner fan under different operation modes of the air conditioner according to the exhaust pressure and the return pressure;
the control unit is respectively in communication connection with the outer fan, the inner fan and the detection unit;
when the air conditioner is operated in a cooling mode, the control unit is configured to:
under the working condition of low-temperature refrigeration, when the exhaust pressure is less than or equal to a first refrigeration preset exhaust pressure of 2.3MPa and the return pressure is greater than or equal to a first preset return pressure of 1.1MPa, controlling the outer fan to operate at a first outer fan preset rotating speed, wherein the first outer fan preset rotating speed is the lowest windshield of the outer fan, and the inner fan adjusts the rotating speed according to a first control method; the rotating speed regulation of the inner fan according to a first control method comprises the following steps: if the exhaust pressure is detected to be less than or equal to a fourth refrigeration preset exhaust pressure of 2.2Mpa, and the return air pressure is detected to be greater than or equal to a second preset return air pressure of 1.2Mpa, the inner fan operates at a second inner fan preset rotating speed, and the second inner fan preset rotating speed is the highest windshield of the inner fan;
when the exhaust pressure is greater than the first refrigeration preset exhaust pressure and less than a second refrigeration preset exhaust pressure, controlling the outer fan to operate at a speed greater than a first outer fan preset speed, and controlling the inner fan to operate at a speed less than a second inner fan preset speed;
when the exhaust pressure is greater than or equal to a second refrigeration preset exhaust pressure and less than a third refrigeration preset exhaust pressure, controlling the outer fan to operate at a second outer fan preset rotating speed, and adjusting the rotating speed of the inner fan according to a second control method; wherein, the inner fan carries out rotation speed regulation according to a second control method and comprises the following steps: step S332, if the exhaust pressure is detected to be greater than or equal to a fifth refrigeration preset exhaust pressure and less than a sixth refrigeration preset exhaust pressure, reducing a preset rotating speed of the inner fan;
and when the exhaust pressure is greater than or equal to the third refrigeration preset exhaust pressure and lasts for a first preset time, controlling the compressor to stop running.
13. An air conditioner comprising a computer-readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the pressure control method of the air conditioner according to any one of claims 1 to 11.
14. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when read and executed by a processor, implements the pressure control method of an air conditioner according to any one of claims 1 to 11.
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