CN113203176B - Compressor exhaust pressure adjusting method and air conditioner - Google Patents

Compressor exhaust pressure adjusting method and air conditioner Download PDF

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Publication number
CN113203176B
CN113203176B CN202110584379.5A CN202110584379A CN113203176B CN 113203176 B CN113203176 B CN 113203176B CN 202110584379 A CN202110584379 A CN 202110584379A CN 113203176 B CN113203176 B CN 113203176B
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compressor
frequency
temperature
running
condenser coil
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CN113203176A (en
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邓赛峰
刘合心
苏闯
陈华
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • 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
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a compressor discharge pressure adjusting method and an air conditioner, comprising the following steps: s1, detecting the outdoor environment temperature Ta and the actual temperature Tc 'of the condenser coil, and correcting the value of the actual temperature Tc' of the condenser coil according to the outdoor environment temperature Ta to obtain the temperature Tc of the condenser coil; s2, determining the running frequency adjusting condition P1 of the compressor and the rotating speed adjusting condition V of the fan according to the relation between the temperature Tc of the condenser coil and the temperature threshold of the coil; s3, determining the operation frequency adjustment condition P2 of the compressor according to the relationship between the air conditioner operation current Ic and the current threshold; s4, adjusting the running frequency of the compressor and the rotating speed of the fan according to the running frequency adjusting condition P1 and P2 of the compressor and the rotating speed adjusting condition V of the fan.

Description

Compressor exhaust pressure adjusting method and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a compressor exhaust pressure adjusting method and an air conditioner.
Background
With the continuous updating and upgrading of air-conditioning products, the requirements of consumers on the comfort and the stability of the air-conditioning products are higher and higher. Generally, after an air conditioner is started to operate, along with the continuous operation of a compressor, a refrigerant forms a high-pressure side and a low-pressure side in different areas in a refrigerant pipeline, and the pressure of the high-pressure side needs to be controlled within a reasonable range, so that the stable operation of the air conditioner is ensured, and potential safety hazards caused by overhigh pressure are avoided.
Especially under the high-temperature working condition, the refrigeration load of the air conditioner is larger, the compressor generally runs at the highest frequency, the exhaust pressure of the compressor is higher at the moment, and when the exhaust pressure of the compressor is close to a protection value, if the running frequency, the rotating speed of a fan and the like of the compressor are not adjusted in time, the shutdown protection of the air conditioner is easily triggered, so that the normal use is influenced, and the comfort and the stability of the air conditioner are reduced.
In order to overcome the potential safety hazard and frequent shutdown protection caused by overhigh exhaust pressure of a compressor, in the conventional air conditioner, a pressure sensor or a pressure switch is usually arranged on the high-pressure side of the compressor for detecting the exhaust pressure of the compressor, when the exhaust pressure of the compressor is detected to reach a protection value, the air conditioner stops running immediately and enters a shutdown protection state, and the air conditioner cannot be started to run again until the exhaust pressure of the compressor is restored to a reasonable range.
However, in this method, the protection value of the pressure sensor or the pressure switch is generally a fixed value, and only protection judgment can be performed, and the discharge pressure of the compressor cannot be detected, predicted, and adjusted. In addition, when the differential pressure of the air conditioning system does not reach the equilibrium or in the vacuum pumping mode, the pressure sensor or the pressure switch is also easy to judge by mistake, and the contact sensitivity of the pressure sensor or the pressure switch is also reduced after the pressure sensor or the pressure switch is used for a period of time, which will also affect the judgment accuracy.
The present application is proposed to solve the above technical problems.
Disclosure of Invention
The invention designs a compressor exhaust pressure adjusting method and an air conditioner, and aims to overcome the technical problems that in the prior art, the detection precision of the compressor exhaust pressure is low, the erroneous judgment is easy, the detection, the prejudgment and the adjustment of the compressor exhaust pressure cannot be carried out, the air conditioner is easy to frequently enter a shutdown protection state, and the comfort and the stability of the air conditioner are influenced.
In order to solve the problems, the invention discloses a method for adjusting the exhaust pressure of a compressor, which comprises the following steps:
s1, detecting the outdoor environment temperature Ta and the actual temperature Tc 'of the condenser coil, and correcting the value of the actual temperature Tc' of the condenser coil according to the outdoor environment temperature Ta to obtain the temperature Tc of the condenser coil;
S2, determining the running frequency adjusting condition P1 of the compressor and the rotating speed adjusting condition V of the fan according to the relation between the temperature Tc of the condenser coil and the temperature threshold of the coil;
s3, determining the operation frequency adjustment condition P2 of the compressor according to the relation between the air conditioner operation current Ic and the current threshold;
and S4, adjusting the operation frequency of the compressor and the rotating speed of the fan according to the operation frequency adjusting conditions P1 and P2 of the compressor and the rotating speed adjusting condition V of the fan.
The method for adjusting the exhaust pressure of the compressor has the advantages of being high in accuracy, capable of effectively reducing the times of shutdown protection of the air conditioner and improving the operation stability and comfort degree of the air conditioner.
Further, the compressor discharge pressure adjusting method is used for adjusting the discharge pressure of the compressor when the air conditioner operates under the refrigeration working condition.
Further, the step S1 includes:
s11, detecting the outdoor environment temperature Ta and the actual condenser coil temperature Tc';
s12, judging whether the outdoor environment temperature Ta meets Ta & gt 2, if so, making the condenser coil temperature Tc equal to the actual condenser coil temperature Tc'; if not, go to step S13;
S13, judging whether the outdoor environment temperature Ta meets Ta1 and Ta2, if so, making the condenser coil temperature Tc equal to the actual condenser coil temperature Tc' + Kc 1; if not, the condenser coil temperature Tc is made equal to the condenser coil actual temperature Tc' + Kc 2.
In order to more accurately reflect the influence of the outdoor ambient temperature Ta on the condensing temperature of the condenser by the actual temperature Tc 'of the condenser coil, and finally achieve the purpose of more accurately reflecting the variation of the discharge pressure of the compressor and accurately adjusting the discharge pressure of the compressor, in the step S1, the actual temperature Tc' of the condenser coil is respectively corrected under different outdoor ambient temperatures Ta, so as to reduce errors caused by different states of the refrigerant in the heat exchanger due to different outdoor ambient temperatures Ta.
Further, the step S2 includes:
s21, acquiring the value of the condenser coil temperature Tc;
s22, judging whether the temperature Tc of the condenser coil meets Tc < Tc1, if so, normally operating the compressor; if not, continue to step S23;
s23, judging whether the temperature Tc of the condenser coil meets Tc1 or more and Tc2 or not, if so, keeping the running frequency of the compressor constant, forbidding frequency increase, and increasing the rotating speed of the outdoor fan by one level; if not, continue to step S24;
S24, judging whether the temperature Tc of the condenser coil meets Tc2, Tc is more than Tc and is not less than Tc3, if so, reducing the running frequency of the compressor to a target frequency F1(t +1), and simultaneously increasing the rotating speed of the outdoor fan to the highest level; if not, the air conditioner carries out shutdown protection.
Through the steps S21 to S24, the operating frequency adjustment condition P1 of the compressor includes the following components: the first time, Tc is less than Tc1, the compressor normally operates, and the operation frequency and the fan rotating speed of the compressor do not need to be adjusted; secondly, Tc is more than or equal to Tc1 and less than or equal to Tc2, the running frequency of the compressor is kept constant, frequency increase is forbidden, and meanwhile the rotating speed of the outdoor fan is increased by one level; thirdly, Tc is more than Tc2 and is less than or equal to Tc3, the compressor reduces the operation frequency to a target frequency F1(t +1) for operation, and meanwhile, the rotating speed of the outdoor fan is increased to the highest level; fourthly, Tc3 is less than Tc, and the air conditioner enters shutdown protection.
Further, the compressor target frequency F1(t +1) is calculated as follows:
Figure BDA0003086558660000031
wherein, the first and the second end of the pipe are connected with each other,
f1(t +1) is the target frequency of the next regulation cycle, F1(t) is the current operating frequency of the compressor;
a1 and A2 are preset current thresholds;
d1 and D2 are the minimum value and the maximum value of the allowable frequency reduction amplitude respectively, and D1 < D2.
Through the setting of the piecewise function F1(t +1), the method for controlling the exhaust pressure of the compressor has better adaptability and more accurate control, can effectively improve the safety and the stability of the operation of the air conditioner, and simultaneously reduces the times of the compressor entering shutdown protection.
Further, the step S3 includes:
s31, acquiring the value of the air conditioner running current Ic;
s32, judging whether the air conditioner running current Ic meets Ic < A1, if yes, the compressor runs normally; if not, continue to execute step S33;
s33, judging whether the air conditioner running current Ic meets the condition that Ic is more than or equal to A1 and less than or equal to A2, if so, keeping the running frequency of the compressor constant and prohibiting the frequency-increasing running; if not, the compressor operates according to the frequency reduction amplitude F2(t + 1).
Through the steps S31 to S33, the operating frequency adjustment condition P2 of the compressor includes the following components: firstly, Ic is less than A1, the compressor normally operates without adjusting the operating frequency of the compressor and the rotating speed of the fan; secondly, Ic is more than or equal to A1 and less than or equal to A2, the running frequency of the compressor is kept constant, and the frequency rising is forbidden; third, A2 < Ic, the compressor operates with the operating frequency reduced to the target frequency F2(t + 1).
Further, the compressor target frequency F2(t +1) is calculated as follows:
Figure BDA0003086558660000041
wherein the content of the first and second substances,
f2(t +1) is the target frequency for the next regulation cycle; f1(t) is the current operating frequency of the compressor;
tc1, tc2 are preset coil temperature thresholds;
d1 and D2 are the minimum value and the maximum value of the allowable frequency reduction amplitude respectively, and D1 < D2.
Through the setting of the piecewise function F2(t +1), the method for controlling the exhaust pressure of the compressor has better adaptability and more accurate control, can effectively improve the safety and the stability of the operation of the air conditioner, and simultaneously reduces the times of the compressor entering shutdown protection.
Further, the step S4 includes:
s41, acquiring the running frequency adjustment conditions P1 and P2 of the compressor and the rotating speed adjustment condition V of the fan;
s42, controlling the rotation speed of the fan to operate after being adjusted according to the rotation speed adjustment condition V of the fan;
s43, judging whether the running frequency adjusting condition P1 of the compressor needs to control the compressor to carry out shutdown protection, if so, controlling the compressor to enter the shutdown protection; if not, continue to step S44;
s44, judging whether the running frequency adjusting situation P1 of the compressor needs to control the compressor to perform the frequency reduction running, if so, continuing to execute the step S47; if not, continue to step S45;
s45, judging whether the running frequency adjusting condition P2 of the compressor needs to control the compressor to perform frequency reduction running, if so, controlling the running frequency of the compressor to be reduced to the target frequency F2(t +1) and then running; if not, continue to step S46;
s46, judging whether the operation frequency of the compressor needs to be kept constant or not according to the operation frequency adjusting condition P1 or P2 of the compressor, if so, controlling the operation frequency of the compressor to keep the current frequency operation, and forbidding frequency rising; if not, controlling the compressor to normally operate;
S47, judging whether the operation frequency adjusting condition P2 of the compressor needs to control the compressor to perform the frequency reduction operation, if so, continuing to execute the step S48; if not, controlling the running frequency of the compressor to be reduced to the target frequency F1(t +1) and then running;
s48, judging whether the target frequency of the compressor meets F1(t +1) > F2(t +1), if yes, controlling the running frequency of the compressor to be reduced to the target frequency F2(t +1) and then running; if not, the operation frequency of the compressor is controlled to be reduced to the target frequency F1(t +1) and then the compressor is operated.
Through the steps S41 to S48, when the compressor simultaneously satisfies the frequency reduction requirements in the operating frequency adjustment conditions P1 and P2 of the compressor, and the compressor needs to perform frequency reduction operation to the target frequencies F1(t +1) and F2(t +1) according to the frequency reduction requirements in P1 and P2, respectively, the compressor performs frequency reduction operation according to the frequency reduction requirement with a larger frequency reduction amplitude, that is, a reduced frequency requirement with a reduced target frequency, so that control conflict or frequency reduction amplitude overshoot of the compressor caused by frequency reduction amplitude superposition can be effectively avoided.
Furthermore, the value range of D1 is 5-10%, and the value range of D2 is 50-80%.
Through the optimization of the value ranges of D1 and D2, the safety and the stability of the operation of the air conditioner can be further improved, and the times of the compressor entering shutdown protection are reduced.
The air conditioner adopts the compressor exhaust pressure adjusting method to adjust the compressor exhaust pressure.
The compressor discharge pressure adjusting method and the air conditioner have the following advantages:
firstly, a temperature sensor is arranged on an outdoor unit heat exchanger, the exhaust pressure of a compressor is pre-judged and adjusted according to the detected coil temperature, and the adjustment amplitude of the frequency of the compressor is automatically calculated according to the current value, so that the self-adaptive frequency reduction adjustment is realized;
secondly, detecting a current value Ic when the air conditioner operates, correcting the frequency of the compressor through the actual temperature Tc' of the coil of the condenser, further adjusting the exhaust pressure of the compressor, and automatically calculating the adjusting amplitude of the frequency of the compressor according to the temperature of the coil to realize self-adaptive frequency reduction adjustment;
thirdly, according to different outdoor temperatures, correcting the detected actual temperature Tc' of the condenser coil and automatically judging to enable the exhaust pressure to be adjusted more accurately and reliably;
fourthly, a complex detection and control structure is not required to be arranged, and the cost is low;
in summary, it is easy to obtain: the compressor exhaust pressure adjusting method and the air conditioner detect, prejudge and adjust the exhaust pressure of the compressor by combining the actual temperature Tc' of the condenser coil and the running current Ic of the air conditioner, so that the compressor exhaust pressure adjusting method has the advantages of high accuracy, capability of effectively reducing the times of shutdown protection of the air conditioner and improvement of the running stability and comfort of the air conditioner.
Drawings
FIG. 1 is a flow chart of a method for regulating discharge pressure of a compressor according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating the step S1 according to the embodiment of the present invention;
FIG. 3 is a flowchart illustrating the step S2 according to the embodiment of the present invention;
FIG. 4 is a flowchart illustrating the step S3 according to the embodiment of the present invention;
FIG. 5 is a flowchart illustrating the step S4 according to the embodiment of the present invention;
FIG. 6 is a curve showing the variation of the compressor down-conversion amplitude with the air conditioner operating current Ic when Tc2 is greater than Tc and equal to Tc3 in step S24 according to the embodiment of the present invention;
fig. 7 is a variation curve of the target frequency F1(t +1) with the air conditioner operating current Ic according to the embodiment of the present invention;
FIG. 8 is a graph of the variation of the frequency reduction amplitude of the compressor with the temperature Tc of the condenser coil when the A1 is not less than Ic not less than A2 in the step S33 according to the embodiment of the present invention;
FIG. 9 is a graph of target frequency F2(t +1) versus condenser coil temperature Tc for an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
1. a compressor; 2. an exhaust line; 3. a four-way reversing valve; 4. a gas return line; 5. a fan; 6. an outer coil temperature sensor; 61. a first outer coil temperature sensor; 62. a second outer coil temperature sensor; 63. a third outer coil temperature sensor; 7. an outdoor heat exchanger; 8. an outdoor ambient temperature sensor; 9. a throttling device; 10. an indoor heat exchanger.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Example 1
As shown in FIGS. 1 to 9, a method for adjusting the discharge pressure of a compressor comprises the steps of
S1, detecting the outdoor environment temperature Ta and the actual temperature Tc 'of the condenser coil, and correcting the value of the actual temperature Tc' of the condenser coil according to the outdoor environment temperature Ta to obtain the temperature Tc of the condenser coil;
s2, determining the running frequency adjusting condition P1 of the compressor and the rotating speed adjusting condition V of the fan according to the relation between the temperature Tc of the condenser coil and the temperature threshold of the coil;
s3, determining the operation frequency adjustment condition P2 of the compressor according to the relation between the air conditioner operation current Ic and the current threshold;
and S4, adjusting the operation frequency of the compressor and the rotating speed of the fan according to the operation frequency adjusting conditions P1 and P2 of the compressor and the rotating speed adjusting condition V of the fan.
Further, the method for adjusting the discharge pressure of the compressor further includes, after the step S4, re-executing the step S1 at set time intervals, re-detecting the outdoor ambient temperature Ta and the actual temperature Tc' of the condenser coil, and updating the temperature Tc of the condenser coil in real time; and then, sequentially executing the steps S2-S4, and adjusting the running frequency of the compressor and the rotating speed of the fan in real time according to the real-time running state of the air conditioner.
As some embodiments of the present application, the compressor discharge pressure adjusting method may be used for adjusting the discharge pressure of the compressor under various working conditions of the air conditioner, but under a high-temperature refrigeration working condition, the operation frequency of the compressor is higher, the discharge pressure is higher, frequent shutdown protection of the air conditioner is more easily induced, and under the high-temperature refrigeration working condition, the condenser is located outdoors, and the condensation temperature of the condenser is more easily affected by the outdoor ambient temperature Ta.
In addition, the working principle of the compressor discharge pressure regulating method is as follows: the method for adjusting the exhaust pressure of the compressor has the advantages of being high in accuracy, capable of effectively reducing the times of shutdown protection of the air conditioner and improving the operation stability and comfort degree of the air conditioner. Specifically, when the air conditioner operates under the refrigeration working condition, the outdoor heat exchanger belongs to the high-pressure side of the air conditioning system, the actual temperature Tc ' of the condenser coil of the outdoor heat exchanger (namely a condenser) is detected through a temperature sensor arranged on the outdoor heat exchanger, and the exhaust pressure of the compressor of the air conditioning system can be deduced by utilizing the corresponding relation between the actual temperature Tc ' of the condenser coil and the exhaust pressure of the compressor, so that the operating frequency of the compressor and the rotating speed of an outdoor fan are adjusted according to the actual temperature Tc ' of the condenser coil, and the purposes of detecting, prejudging and adjusting the exhaust pressure of the compressor are achieved. Meanwhile, the exhaust pressure of the compressor is corrected by detecting the magnitude of the main machine current Ic in real time during the operation of the air conditioner and utilizing the positive relation between the current Ic and the frequency of the compressor, so that the regulation is more accurate, and the protection is more comprehensive and reliable. Finally, the compressor exhaust pressure adjusting method can accurately adjust the exhaust pressure of the compressor, reduce the times that the air conditioner enters shutdown protection due to overhigh exhaust pressure of the compressor, increase the operation stability of the air conditioner, improve the use effect of the air conditioner and reasonably control the cost.
Specifically, the step S1 includes:
s11, detecting the outdoor environment temperature Ta and the actual condenser coil temperature Tc';
s12, judging whether the outdoor environment temperature Ta meets Ta & gt 2, if so, making the condenser coil temperature Tc equal to the actual condenser coil temperature Tc'; if not, go to step S13;
s13, judging whether the outdoor environment temperature Ta meets Ta1 and Ta2, if so, making the condenser coil temperature Tc equal to the actual condenser coil temperature Tc' + Kc 1; if not, the condenser coil temperature Tc is made equal to the condenser coil actual temperature Tc' + Kc 2.
Because the condenser coil actual temperature Tc 'is related to the condensing temperature of the condenser and is in one-to-one correspondence with the condensing temperature of the condenser, and the condensing temperature of the condenser is related to the exhaust pressure of the compressor and is in one-to-one correspondence with the condensing temperature of the condenser, the condenser coil actual temperature Tc' is also related to the exhaust pressure of the compressor and is in one-to-one correspondence with the exhaust pressure of the compressor, so that the condensing temperature of the condenser can be calculated through the condenser coil actual temperature Tc ', the exhaust pressure of the compressor can be further calculated, and finally the purposes of reflecting the exhaust pressure of the compressor through the condenser coil actual temperature Tc' and regulating the exhaust pressure of the compressor are achieved.
In addition, the condensing temperature of the condenser is influenced by the refrigerant flow rate and the cooling load, and generally, when the outdoor ambient temperature Ta is high, the cooling load is large, and the refrigerant flow rate is also large, at this time, the condensing temperature of the condenser and the discharge pressure of the compressor are high; conversely, when the outdoor ambient temperature Ta is low, the condensing temperature of the condenser and the discharge pressure of the compressor are also low. Generally, in an outdoor heat exchanger (as a condenser during refrigeration), the temperature of refrigerant is gradually reduced from high temperature to a condensing temperature or a supercooling temperature along the flowing direction of the refrigerant, the first half part of a tube pass is generally in a gas state, the second half part of the tube pass is gradually condensed into a liquid state, the cooling load is reduced along with the reduction of the outdoor environment temperature Ta, the liquid refrigerant in the heat exchanger is increased, and the condensing temperature of the refrigerant is also lower. It can be seen that the refrigerant flow and the cooling load are influenced by the outdoor ambient temperature Ta, and the condensing temperature of the condenser is influenced by the refrigerant flow and the cooling load, so that, at the very least, the condensing temperature of the condenser is influenced by the outdoor ambient temperature Ta, and when the outdoor ambient temperature Ta is higher, the condensing temperature of the condenser is higher; when the outdoor ambient temperature Ta is low, the condensing temperature of the condenser is low. In the method, the actual temperature Tc 'of the condenser coil is adopted to indirectly reflect the exhaust pressure of the compressor, but the condenser coil is not at the condensing temperature, but in order to reflect the influence of the outdoor environment temperature Ta on the condensing temperature of the condenser, the actual temperature Tc' of the condenser coil is corrected by the outdoor environment temperature Ta, and finally the purpose of correcting the influence of the outdoor environment temperature Ta on the condensing temperature of the condenser is achieved. Specifically, in order to reflect the influence of the outdoor ambient temperature Ta on the condensation temperature of the condenser by the actual temperature Tc 'of the condenser coil more accurately, and finally achieve the purpose of reflecting the variation of the discharge pressure of the compressor more accurately and adjusting the discharge pressure of the compressor accurately, step S1 corrects the actual temperature Tc' of the condenser coil respectively at different outdoor ambient temperatures Ta so as to reduce errors caused by different states of the refrigerant in the heat exchanger due to different outdoor ambient temperatures Ta.
Specifically, in step S1:
when Ta is more than Ta2, the outdoor environment temperature Ta is high, the influence of the outdoor environment temperature Ta on the condensation temperature is considered to be small, at the moment, the condensation temperature of the condenser does not need to be corrected, namely the actual temperature Tc 'of the condenser coil does not need to be corrected, and the temperature Tc of the condenser coil is equal to the actual temperature Tc' of the condenser coil;
when Ta1 is not less than Ta2, the outdoor environment temperature Ta is moderate, and the outdoor environment temperature Ta has certain influence on the condensation temperature, at the moment, the condensation temperature of the condenser needs to be corrected, namely the actual temperature Tc' of the condenser coil needs to be corrected; specifically, the condenser coil temperature Tc is made equal to the condenser coil actual temperature Tc '+ Kc1, and the condenser coil actual temperature Tc' is corrected by a correction amount Kc 1;
when Ta2 is less than Ta, the outdoor environment temperature Ta is low, and the outdoor environment temperature Ta has great influence on the condensation temperature, at the moment, the condensation temperature of the condenser needs to be corrected, namely the actual temperature Tc' of the coil pipe of the condenser needs to be corrected; specifically, the condenser coil temperature Tc is made equal to the condenser coil actual temperature Tc '+ Kc2, and the condenser coil actual temperature Tc' is corrected by a correction amount Kc 2.
Wherein, Kc1 and Kc2 are preset correction amounts.
Since the lower the outdoor ambient temperature Ta, the greater the effect on the condensing temperature of the condenser, and the greater the extent of decrease in the condensing temperature of the condenser, Kc1 < Kc2 is preferable.
As some embodiments of the present application, Kc1 has a value ranging from 0 to 5 ℃; the value range of Kc2 is 3-8 ℃.
Further, the ta1 and the ta2 are preset ambient temperature thresholds, wherein ta1 < ta 2.
As some embodiments of the present application, the value range of ta1 is 20-30 ℃; the value range of the ta2 is 30-40 ℃.
Specifically, the step S2 includes:
s21, acquiring the value of the condenser coil temperature Tc;
s22, judging whether the temperature Tc of the condenser coil meets Tc < Tc1, if so, normally operating the compressor; if not, continue to step S23;
s23, judging whether the temperature Tc of the condenser coil meets Tc1 or more and Tc2 or not, if so, keeping the running frequency of the compressor constant, forbidding frequency increase, and increasing the rotating speed of the outdoor fan by one level; if not, continue to step S24;
s24, judging whether the temperature Tc of the condenser coil meets Tc2, Tc is more than Tc and is not less than Tc3, if so, reducing the running frequency of the compressor to a target frequency F1(t +1), and simultaneously increasing the rotating speed of the outdoor fan to the highest level; if not, the air conditioner carries out shutdown protection.
Specifically, in step S22, if the condenser coil temperature Tc < Tc1 is detected for the continuous time t1, it is determined that the condensing temperature of the outdoor unit condenser is low at this time, the discharge pressure of the corresponding compressor is within the safe range, and the air conditioner may perform normal control.
Preferably, the value of the continuous time t1 ranges from 10 seconds to 60 seconds.
Wherein tc1, tc2 and tc3 are preset coil temperature thresholds, and tc1 is less than tc2 is less than tc 3.
As some embodiments of the present application, the value range of tc1 is 45-50 ℃; the value range of tc2 is 50-55 ℃; the value range of tc3 is 56-62 ℃.
Further, in the step S23, if it is detected that Tc1 is not less than Tc < Tc2 within the continuous time t1, it is determined that the condensing temperature of the outdoor heat exchanger is higher and the discharge pressure of the corresponding compressor is higher, and at this time, on one hand, the air speed of the outdoor fan is controlled to increase by one step, the heat exchange air volume of the outdoor heat exchanger is increased, and the discharge pressure of the compressor is reduced; on the other hand, the current running frequency of the compressor is maintained, the continuous frequency increasing is forbidden, and the exhaust pressure is prevented from continuously increasing.
Further, in the step S23, if the determination result is that the wind speed of the outdoor fan is increased by one level, but the wind speed of the outdoor fan reaches the highest level at this time, the highest level operation may be maintained.
Further, in the step S23, if it is detected again that Tc1 is equal to or less than Tc < Tc2 when the compressor discharge pressure adjusting method is operated again after the interval setting time, the wind speed of the outdoor fan is controlled to increase by one step again until the wind speed of the outdoor fan increases to the highest level and reaches the maximum rotation speed.
In step S24, if Tc2 < Tc ≦ Tc3 is detected during the continuous time t1, it is determined that the condensing temperature of the outdoor heat exchanger is higher, the discharge pressure of the compressor at this time is close to the upper limit protection value, and in order to prevent the discharge pressure of the compressor from increasing continuously, the outdoor fan is controlled to immediately increase from the current rotation speed to the maximum rotation speed (if the current rotation speed is already the maximum rotation speed, the outdoor fan is maintained), and the compressor is controlled to decrease the operation frequency to the target frequency F1(t +1) on the basis of the current operation frequency F1(t), so as to achieve the purpose of rapidly decreasing the discharge pressure of the compressor, where the calculation rule of the target frequency F1(t +1) of the compressor is as follows:
firstly, detecting the operation current value Ic of the air conditioner main machine, and calculating a target frequency F1(t +1) according to the operation current value Ic of the air conditioner main machine;
secondly, the target frequency F1(t +1) is a piecewise function;
Figure BDA0003086558660000121
wherein, F1(t +1) is the target frequency of the next regulation cycle; f1(t) is the current operating frequency of the compressor.
In the above calculation rule of the compressor target frequency F1(t +1), when the current value Ic is less than or equal to a1, the compressor performs frequency reduction according to the minimum frequency reduction amplitude D1, and the frequency reduction amount at this time is F1(t) × D1; when the current value Ic is greater than A2, the compressor performs frequency reduction according to the maximum frequency reduction amplitude D2, wherein the frequency reduction amount is F1(t) D2; when A1 < Ic ≦ A2, the frequency reduction amplitude of the compressor is gradually increased with the gradually increased current value Ic
Figure BDA0003086558660000122
The frequency reduction amount at this time is
Figure BDA0003086558660000123
The current threshold values A1 and A2 are preset current threshold values, A1 is less than A2, the value range of A1 is preferably 28-30A, and the value range of A2 is 30-32A; d1 and D2 are respectively the minimum value and the maximum value of the allowable frequency reduction amplitude, D1 is more than D2, the value range of D1 is preferably 5-10%, and the value range of D2 is preferably 50-80%.
In the regulation and control process of the target frequency F1(t +1), with the gradual increase of the current value Ic, the change curve of the down-conversion amplitude is as shown in fig. 6, and the change curve of the target frequency F1(t +1) is as shown in fig. 7: in fig. 6 to 7, when the current value Ic is equal to or less than a1, the compressor frequency reduction range is D1, the frequency reduction amount is F1(t) D1, and the target frequency F1(t +1) is F1(t) D1; when the current value Ic is more than A1 and less than A2, the frequency reduction amplitude of the compressor is gradually increased,
Figure BDA0003086558660000124
Figure BDA0003086558660000131
Target frequency
Figure BDA0003086558660000132
Figure BDA0003086558660000133
When the current value Ic > a2, the compressor frequency reduction range is D2, the frequency reduction amount is F1(t) × D2, and the target frequency F1(t +1) ═ F1(t) × (1-D2).
And if the operating frequency of the compressor is adjusted according to the frequency reduction amplitude, and Tc2 is not less than Tc and not more than Tc3 is detected in the next period and continuous time t1 again, controlling the compressor to reduce the frequency again according to the method, and further adjusting the exhaust pressure of the air conditioner compressor until the operating frequency of the compressor reaches the lowest allowable frequency, wherein the lowest allowable frequency is preferably F1 (t). multidot.D 1.
In step S24, if Tc3 < Tc is detected during the continuous time t2, it is determined that the high-temperature and high-pressure gas refrigerant cannot exchange heat sufficiently at this time, the condensing temperature is higher than a set value, and the compressor is controlled to immediately stop the operation for safety, and the compressor enters a shutdown protection state.
Preferably, the value of the continuous time t2 ranges from 1 second to 5 seconds.
Further, in the step S24, after the air conditioner enters the shutdown protection state, if the continuous time t3 detects that Tc satisfies Tc < Tc2, it is determined that the discharge pressure of the compressor at this time is recovered to a reasonable range, and the air conditioner is controlled to exit the protection state, so as to allow the air conditioner to start operating again.
Preferably, the continuous time t3 ranges from 1 minute to 5 minutes.
As can be seen from the above: through the steps S21 to S24, the operating frequency adjustment condition P1 of the compressor includes the following components: the first time, Tc is less than Tc1, the compressor normally operates, and the operation frequency and the fan rotating speed of the compressor do not need to be adjusted; secondly, Tc is more than or equal to Tc1 and less than or equal to Tc2, the running frequency of the compressor is kept constant, frequency increase is forbidden, and meanwhile the rotating speed of the outdoor fan is increased by one level; thirdly, Tc is more than Tc2 and is less than or equal to Tc3, the compressor reduces the operation frequency to a target frequency F1(t +1) for operation, and meanwhile, the rotating speed of the outdoor fan is increased to the highest level; fourth, Tc3 < Tc, the air conditioner enters shutdown protection.
Further, the step S3 includes:
s31, acquiring the value of the air conditioner running current Ic;
s32, judging whether the air conditioner running current Ic meets Ic < A1, if yes, the compressor runs normally; if not, continue to step S33;
s33, judging whether the air conditioner running current Ic meets the condition that Ic is more than or equal to A1 and less than or equal to A2, if so, keeping the running frequency of the compressor constant and prohibiting the frequency-increasing running; if not, the compressor operates in a down-conversion mode according to the down-conversion amplitude F2(t + 1).
Specifically, in step S32, if the air conditioner operation current Ic satisfies Ic < a1 in the continuous time t4, it is determined that the current value Ic of the air conditioner operation is within the allowable range, the operation frequency of the compressor is low, and the normal adjustment control is performed.
Further, in the step S33, if the air conditioner operation current Ic satisfies the current value a1 ≤ Ic ≤ a2 during the continuous time t4, the current value Ic of the air conditioner operation approaches the allowable upper limit value, and the compressor maintains the current operation frequency and is prohibited from increasing the frequency; if the air conditioner operation current Ic meets Ic > A2 in the continuous time t4, the current value Ic of the air conditioner operation is judged to be out of the allowable range, the compressor is controlled to reduce the operation frequency to the target frequency F2(t +1) on the basis of the current operation frequency F1(t), and the aim of quickly reducing the exhaust pressure of the compressor is fulfilled, wherein the calculation rule of the target frequency F2(t +1) of the compressor is as follows:
firstly, acquiring the current condenser coil temperature Tc, and calculating a target frequency F2(t +1) according to the current condenser coil temperature Tc;
secondly, the target frequency F2(t +1) is a piecewise function;
Figure BDA0003086558660000141
wherein, F2(t +1) is the target frequency of the next regulation cycle; f1(t) is the current operating frequency of the compressor.
In the above calculation rule of the compressor target frequency F2(t +1), when the condenser coil temperature Tc is less than or equal to Tc1, the compressor performs frequency reduction according to the minimum frequency reduction amplitude D1, wherein the frequency reduction amount is F1(t) × D1; when Tc is more than Tc2, the compressor performs frequency reduction according to the maximum frequency reduction amplitude D2, wherein the frequency reduction amount is F1(t) D2; when Tc1 is more than Tc and less than Tc2, the frequency reduction amplitude of the compressor is gradually increased along with the gradual increase of Tc
Figure BDA0003086558660000142
The frequency reduction amount at this time is
Figure BDA0003086558660000143
The temperature control method comprises the following steps of A, controlling the temperature of a coil pipe to be in a temperature range of tc1 and tc2, wherein the preset coil pipe temperature threshold value in the step S2 is adopted, tc1 is greater than tc2, the value range of tc1 is preferably 45-50 ℃, and the value range of tc2 is 50-55 ℃; d1 and D2 are respectively the minimum value and the maximum value of the allowable frequency reduction amplitude, the value range of D1 is preferably 5-10%, and the value range of D2 is preferably 50-80%.
In the above-mentioned variation process of the target frequency F2(t +1), as the condenser coil temperature Tc increases gradually, the variation curve of the down-conversion amplitude is shown in fig. 8, and the variation curve of the target frequency F2(t +1) is shown in fig. 9: in fig. 8 to 9, when the condenser coil temperature Tc is not greater than Tc1, the frequency reduction amplitude of the compressor is D1, the frequency reduction amount is F1(t) D1, and the target frequency F2(t +1) is F1(t) D1; when Tc1 is more than Tc and less than Tc2, the frequency reduction amplitude of the compressor is gradually increased,
Figure BDA0003086558660000151
Figure BDA0003086558660000152
target frequency
Figure BDA0003086558660000153
Figure BDA0003086558660000154
When Tc > Tc2The frequency reduction amplitude of the compressor is D2, the frequency reduction amount is F1(t) D2, and the target frequency F2(t +1) is F1(t) (1-D2).
And after the running frequency of the compressor is adjusted according to the frequency reduction amplitude, if A1 is more than or equal to Ic and less than or equal to A2 is detected in the next period and the continuous time t4 again, controlling the compressor to perform frequency reduction again according to the method, and further adjusting the discharge pressure of the air conditioner compressor until the running frequency of the compressor reaches the lowest allowable frequency, wherein the lowest allowable frequency is preferably F1 (t). multidot.D 1. And if the next period, namely the continuous time t4, detects that Ic is less than A1, the limitation to the frequency of the compressor is cancelled, and the normal regulation is carried out.
The values of A1 and A2 are set according to the model size, the power specification and the compressor displacement of different air conditioners, and for example, the values of A1 and A2 are determined through experimental tests.
Preferably, the value of the continuous time t4 ranges from 1 second to 5 seconds.
Preferably, the value range of A1 is 28-30A; the value range of A2 is 30-32A.
According to the above, the following results are obtained: through the steps S31 to S33, the operating frequency adjustment condition P2 of the compressor includes the following components: firstly, Ic is less than A1, the compressor normally operates without adjusting the operating frequency of the compressor and the rotating speed of the fan; secondly, Ic is more than or equal to A1 and less than or equal to A2, the running frequency of the compressor is kept constant, and the frequency rising is forbidden; third, A2 < Ic, the compressor operates with the operating frequency reduced to the target frequency F2(t + 1).
Further, the step S4 includes:
s41, acquiring the running frequency adjustment conditions P1 and P2 of the compressor and the rotating speed adjustment condition V of the fan;
s42, controlling the rotation speed of the fan to operate after being adjusted according to the rotation speed adjustment condition V of the fan;
s43, judging whether the running frequency adjusting condition P1 of the compressor needs to control the compressor to carry out shutdown protection, if so, controlling the compressor to enter the shutdown protection; if not, continue to step S44;
S44, judging whether the operation frequency adjusting condition P1 of the compressor needs to control the compressor to perform the frequency reduction operation, if so, continuing to execute the step S47; if not, continue to execute step S45;
s45, judging whether the operation frequency adjusting condition P2 of the compressor needs to control the compressor to perform frequency reduction operation, if so, controlling the operation frequency of the compressor to perform operation after the operation frequency is reduced to a target frequency F2(t + 1); if not, continue to execute step S46;
s46, judging whether the operation frequency adjusting condition P1 or P2 of the compressor needs to keep the operation frequency of the compressor constant, if so, controlling the operation frequency of the compressor to keep the current frequency operation, and forbidding frequency increase; if not, controlling the compressor to normally operate;
s47, judging whether the operation frequency adjusting condition P2 of the compressor needs to control the compressor to perform the frequency reduction operation, if so, continuing to execute the step S48; if not, controlling the running frequency of the compressor to be reduced to the target frequency F1(t +1) and then running;
s48, judging whether the target frequency of the compressor meets F1(t +1) > F2(t +1), if yes, controlling the running frequency of the compressor to be reduced to the target frequency F2(t +1) and then running; if not, the operation frequency of the compressor is controlled to be reduced to the target frequency F1(t +1) and then the compressor is operated.
Through the steps S41 to S48, when the compressor simultaneously satisfies the frequency reduction requirements in the operating frequency adjustment conditions P1 and P2 of the compressor, and the compressor needs to perform frequency reduction operation to the target frequencies F1(t +1) and F2(t +1) according to the frequency reduction requirements in P1 and P2, respectively, the compressor performs frequency reduction operation according to the frequency reduction requirement with a larger frequency reduction amplitude, that is, a reduced frequency requirement with a reduced target frequency, so that control conflict or frequency reduction amplitude overshoot of the compressor caused by frequency reduction amplitude superposition can be effectively avoided.
Further, in the step S42, if the determination result is that the wind speed of the outdoor fan is increased by one level, but the wind speed of the outdoor fan has already reached the highest level at this time, the highest level operation may be maintained.
In the present application, the steps S1 to S3 only execute the detection and determination process, and the determination result does not need to be executed immediately, but the determination result is comprehensively determined in the step S4 and then is executed in a unified manner.
Example 2
The application also provides an air conditioner, and the air conditioner adopts the compressor exhaust pressure adjusting method to adjust the exhaust pressure of the compressor.
Specifically, as shown in fig. 10, the air conditioner includes an indoor heat exchanger 10, an outdoor heat exchanger 7, a throttling device 9, a compressor 1, and a fan 5, wherein the outdoor heat exchanger 7, the compressor 1, and the fan 5 are located outdoors, an inlet of the compressor 1 is provided with an air return line 4, and an outlet of the compressor 1 is provided with an air exhaust line 2, the air return line 4, the air exhaust line 2, the outdoor heat exchanger 7, and the indoor heat exchanger 10 are connected by a four-way reversing valve 3, the outdoor heat exchanger 7 is provided with an external coil temperature sensor 6, and the external coil temperature sensor 6 is used for measuring an actual temperature Tc' of a condenser coil of the outdoor heat exchanger 7 (i.e., a condenser under a high-temperature refrigeration condition).
Further, the air conditioner further comprises an outdoor ambient temperature sensor 8 installed outdoors, wherein the outdoor ambient temperature sensor 8 is used for detecting an outdoor ambient temperature Ta.
As some embodiments of the present application, the actual condenser coil temperature Tc 'detected by the external coil temperature sensor 6 may be a coil temperature at a refrigerant inlet of the outdoor heat exchanger 7, a coil temperature of the intermediate coil, a coil temperature at an outlet, and the like, and according to a difference in the detection position of the external coil temperature sensor 6, preset values such as the coil temperature threshold value, the corrected value Kc1 of the actual condenser coil temperature Tc', and Kc2 may be appropriately adjusted.
Preferably, the actual condenser coil temperature Tc' detected by the outer coil temperature sensor 6 is the temperature of the intermediate coil of the outdoor heat exchanger 7.
As some embodiments of the present application, the plurality of the outer-coil temperature sensors 6 may be provided, for example, a first outer-coil temperature sensor 61 located on the coil at the refrigerant inlet of the outdoor heat exchanger 7, a second outer-coil temperature sensor 62 located on the middle coil, a third outer-coil temperature sensor 63 located on the outlet coil, and the like, where the condenser coil actual temperature Tc' is an average value of the first outer-coil temperature sensor 61, the second outer-coil temperature sensor 62, and the third outer-coil temperature sensor 63.
Although the present invention is disclosed above, the present invention is not limited thereto. In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.

Claims (9)

1. The method for regulating the exhaust pressure of the compressor is characterized by comprising the following steps
S1, detecting the outdoor environment temperature Ta and the actual temperature Tc 'of the condenser coil, and correcting the value of the actual temperature Tc' of the condenser coil according to the outdoor environment temperature Ta to obtain the temperature Tc of the condenser coil;
S2, determining the running frequency adjusting condition P1 of the compressor and the rotating speed adjusting condition V of the fan according to the relation between the temperature Tc of the condenser coil and the temperature threshold of the coil;
s3, determining the operation frequency adjustment condition P2 of the compressor according to the relationship between the air conditioner operation current Ic and the current threshold;
s4, adjusting the running frequency of the compressor and the rotating speed of the fan according to the running frequency adjusting conditions P1 and P2 of the compressor and the rotating speed adjusting condition V of the fan;
wherein, step S1 includes:
s11, detecting the outdoor environment temperature Ta and the actual condenser coil temperature Tc';
s12, judging whether the outdoor environment temperature Ta meets Ta & gt 2, if so, making the condenser coil temperature Tc equal to the actual condenser coil temperature Tc'; if not, go to step S13;
s13, judging whether the outdoor environment temperature Ta meets Ta1 and Ta2, if so, making the condenser coil temperature Tc equal to the actual condenser coil temperature Tc' + Kc 1; if not, the condenser coil temperature Tc is made equal to the condenser coil actual temperature Tc' + Kc2, and Kc1 and Kc2 are preset correction amounts.
2. The compressor discharge pressure regulating method as set forth in claim 1, wherein the compressor discharge pressure regulating method is used for regulating the compressor discharge pressure when the air conditioner operates under a cooling condition.
3. The compressor discharge pressure regulation method of claim 1, wherein step S2 includes:
s21, acquiring the value of the condenser coil temperature Tc;
s22, judging whether the temperature Tc of the condenser coil meets Tc < Tc1, if so, normally operating the compressor; if not, continue to execute step S23;
s23, judging whether the condenser coil temperature Tc meets Tc 1-Tc 2, if so, keeping the running frequency of the compressor constant, forbidding frequency boosting, and increasing the rotating speed of an outdoor fan by one step; if not, continue to execute step S24;
s24, judging whether the condenser coil temperature Tc meets Tc2 < Tc ≤ Tc3, if yes, reducing the running frequency of the compressor to a target frequency F1(t +1), and increasing the rotating speed of the outdoor fan to the highest level; if not, the air conditioner carries out shutdown protection.
4. The compressor discharge pressure regulation method of claim 3, wherein the compressor target frequency F1(t +1) is calculated as follows:
Figure FDA0003591183040000021
(A1＜Ic≤A2)
wherein, the first and the second end of the pipe are connected with each other,
f1(t +1) is the target frequency of the next regulation cycle, F1(t) is the current operating frequency of the compressor;
a1 and A2 are preset current thresholds;
d1 and D2 are the minimum value and the maximum value of the allowable frequency reduction amplitude respectively, and D1 < D2.
5. The compressor discharge pressure regulation method of claim 1, wherein step S3 includes:
s31, acquiring the value of the air conditioner running current Ic;
s32, judging whether the air conditioner running current Ic meets Ic < A1, if yes, the compressor runs normally; if not, continue to execute step S33;
s33, judging whether the air conditioner running current Ic meets the condition that Ic is more than or equal to A1 and less than or equal to A2, if so, keeping the running frequency of the compressor constant and forbidding the frequency boosting running; if not, the compressor operates according to the frequency reduction amplitude F2(t + 1).
6. The compressor discharge pressure regulation method of claim 5, wherein the compressor target frequency F2(t +1) is calculated as follows:
Figure FDA0003591183040000031
(tc1＜Tc≤tc2)
wherein, the first and the second end of the pipe are connected with each other,
f2(t +1) is the target frequency for the next regulation cycle; f1(t) is the current operating frequency of the compressor;
tc1, tc2 are preset coil temperature thresholds;
d1 and D2 are the minimum value and the maximum value of the allowable frequency reduction amplitude respectively, and D1 < D2.
7. The compressor discharge pressure regulation method of claim 1, wherein step S4 includes:
s41, acquiring the running frequency adjustment conditions P1 and P2 of the compressor and the rotating speed adjustment condition V of the fan;
s42, controlling the rotation speed of the fan to operate after being adjusted according to the rotation speed adjustment condition V of the fan;
S43, judging whether the operation frequency adjusting condition P1 of the compressor needs to control the compressor to carry out shutdown protection, if so, controlling the compressor to enter the shutdown protection; if not, continue to execute step S44;
s44, judging whether the running frequency adjusting situation P1 of the compressor needs to control the compressor to perform the frequency reduction running, if so, continuing to execute the step S47; if not, continue to execute step S45;
s45, judging whether the running frequency adjusting condition P2 of the compressor needs to control the compressor to perform frequency reduction running, if so, controlling the running frequency of the compressor to be reduced to the target frequency F2(t +1) and then running; if not, continue to step S46;
s46, judging whether the operation frequency of the compressor needs to be kept constant or not according to the operation frequency adjusting condition P1 or P2 of the compressor, if so, controlling the operation frequency of the compressor to keep the current frequency operation, and forbidding frequency rising; if not, controlling the compressor to normally operate;
s47, judging whether the running frequency adjusting situation P2 of the compressor needs to control the compressor to perform the frequency reduction running, if so, continuing to execute the step S48; if not, controlling the running frequency of the compressor to be reduced to the target frequency F1(t +1) and then running;
s48, judging whether the target frequency of the compressor meets F1(t +1) > F2(t +1), if so, controlling the running frequency of the compressor to be reduced to the target frequency F2(t +1) and then running; if not, the operation frequency of the compressor is controlled to be reduced to the target frequency F1(t +1) and then the compressor is operated.
8. The method for adjusting the exhaust pressure of the compressor according to claim 4 or 6, wherein the range of D1 is 5-10%, and the range of D2 is 50-80%.
9. An air conditioner, characterized in that the air conditioner adopts the compressor discharge pressure regulating method of any one of the claims 1-8 to regulate the discharge pressure of the compressor.
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