CN114198859A - Compressor oil return control method and air conditioner - Google Patents
Compressor oil return control method and air conditioner Download PDFInfo
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- CN114198859A CN114198859A CN202111506471.6A CN202111506471A CN114198859A CN 114198859 A CN114198859 A CN 114198859A CN 202111506471 A CN202111506471 A CN 202111506471A CN 114198859 A CN114198859 A CN 114198859A
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 239000010725 compressor oil Substances 0.000 title claims abstract description 10
- 239000003921 oil Substances 0.000 claims abstract description 33
- 238000004378 air conditioning Methods 0.000 claims abstract description 26
- 230000005494 condensation Effects 0.000 claims description 8
- 238000009833 condensation Methods 0.000 claims description 8
- 238000001704 evaporation Methods 0.000 claims description 7
- 230000008020 evaporation Effects 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000005057 refrigeration Methods 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000010721 machine oil Substances 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the field of air conditioners, and particularly relates to a compressor oil return control method and an air conditioner, wherein the compressor oil return control method comprises the following steps: acquiring operation parameters of an air conditioning unit, and calculating the suction-exhaust pressure ratio epsilon of a compressor according to the operation parameters; comparing the air suction-exhaust pressure ratio epsilon with the set air suction-exhaust pressure ratio epsilon0And adjusting the running speed of the outer fan and the opening of the throttle valve according to the comparison result. The invention regulates and controls the rotating speed of the outdoor fan and the opening of the throttle valve according to the condition of the suction-exhaust pressure ratio of the compressor, ensures that the compressor can normally return oil under the working condition of low pressure ratio, ensures that the air conditioning unit can stably run for a long time under the working condition of low pressure ratio, and can realize the pressure ratio of the air conditioning unitAnd (4) freely regulating and controlling.
Description
Technical Field
The invention belongs to the field of air conditioners, and particularly relates to a compressor oil return control method and an air conditioner.
Background
At present, when all compressors are in refrigeration operation, refrigerating machine oil is discharged along with the discharge of a refrigerant, if the oil return of the compressors is not smooth, the temperature inside the shell of the compressor is overhigh along with the increase of the operation time of a unit, and therefore damage is caused. Therefore, in order to ensure that the compressor does not run short of oil, two methods which are commonly used at present are (1) separating oil in exhaust gas by an oil separator and returning the oil to the compressor by an oil return capillary tube; (2) the oil return is achieved by a specific oil return program, mainly by bringing the oil back to the compressor by return air. At present, most of units bring oil back to the compressor through high-speed flow of return air so as to ensure that the compressor can stably run for a long time, but the oil return mode is only suitable for normal pressure ratio working conditions and is not suitable for low pressure ratio working conditions. Therefore, a solution to the problems that when the air conditioner operates under a low pressure ratio working condition, the unit operation loss is increased, the energy efficiency is reduced, and even the compressor is scrapped due to poor oil return is needed to be provided.
The present invention has been made in view of this situation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a compressor oil return control method and an air conditioner, which can return oil normally under the working condition of low pressure ratio and ensure the stable operation of a compressor under the working condition of low pressure ratio.
In order to solve the technical problem, the invention provides an oil return control method for a compressor, which comprises the following steps of
Acquiring operation parameters of an air conditioning unit, and calculating the suction-exhaust pressure ratio epsilon of a compressor according to the operation parameters;
comparing the air suction-exhaust pressure ratio epsilon with the set air suction-exhaust pressure ratio epsilon0And adjusting the running speed of the outer fan and the opening of the throttle valve according to the comparison result.
Further optionally, the comparing the suction-to-exhaust pressure ratio epsilon with the set suction-to-exhaust pressure ratio epsilon0According to the comparison result, adjusting the running speed of the external fan and the opening of the throttle valve, including
When the air suction-exhaust pressure ratio epsilon is larger than the set air suction-exhaust pressure ratio epsilon0When the current running state is maintained, the running is continued;
when the air suction-exhaust pressure ratio epsilon is less than or equal to the set air suction-exhaust pressure ratio epsilon0In time, after the air suction and exhaust pressure ratio is operated for a first time period t1 under the working condition, a first control process is executed, wherein the first control process is to reduce the operating speed of the outer fan and reduce the jointOpening of the flow valve.
Further optionally, the comparing the suction-to-exhaust pressure ratio epsilon with the set suction-to-exhaust pressure ratio epsilon0According to the comparison result to regulate the running speed of external fan and throttle valve opening degree, also includes
After the first control process is executed, the intake/exhaust pressure ratio epsilon is continuously compared with the set intake/exhaust pressure ratio epsilon0The size of (d);
when epsilon is less than or equal to the set air suction-exhaust pressure ratio epsilon0When the first control process is executed, continuing to execute the first control process;
when epsilon is greater than set air suction-exhaust pressure ratio epsilon0And executing a second control process after the air suction and exhaust pressure ratio is operated for a second time period t2 under the working condition, wherein the second control process is to increase the operating speed of the outer fan and increase the opening of the throttle valve.
Further optionally, the comparing the suction-to-exhaust pressure ratio epsilon with the set suction-to-exhaust pressure ratio epsilon0According to the comparison result to regulate the running speed of external fan and throttle valve opening degree, also includes
After the second control process is executed, the intake/exhaust pressure ratio epsilon is continuously compared with the set intake/exhaust pressure ratio epsilon0The size of (d);
when epsilon is less than or equal to the set air suction-exhaust pressure ratio epsilon0When the air suction and exhaust pressure ratio is in the working condition, the first control process is executed after the air suction and exhaust pressure ratio is operated for a first time period t 1;
when epsilon is greater than set air suction-exhaust pressure ratio epsilon0And continuing to execute the second control process.
Further optionally, the first time period t1 satisfies: t1 ═ f (ε - ε0)。
Further optionally, the first time period t1 satisfies: t1 ═ a1-a2(ε - ε0) Wherein a1 and a2 are constants.
Further optionally, the obtaining an operating parameter of the air conditioning unit and calculating a suction-discharge pressure ratio epsilon of the compressor according to the operating parameter comprise
Acquiring suction pressure and discharge pressure of a compressor; or acquiring a condensation temperature and an evaporation temperature, and converting the condensation temperature and the evaporation temperature to obtain the exhaust pressure and the suction pressure of the compressor;
calculating the suction-exhaust pressure ratio epsilon of the compressor, and satisfying the following conditions: ε is the discharge pressure/suction pressure.
The present invention also proposes a control device of an air conditioner, comprising one or more processors and a non-transitory computer-readable storage medium storing program instructions, the one or more processors being configured to implement the method according to any one of claims 1 to 7 when the one or more processors execute the program instructions.
The invention also proposes a non-transitory computer-readable storage medium having stored thereon program instructions for implementing a method according to any one of the above when the program instructions are executed by one or more processors.
The invention also proposes an air conditioner that employs the method of any one of the above, or that includes the control device described above, or that has a non-transitory computer-readable storage medium according to the above.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the invention regulates and controls the rotating speed of the outdoor fan and the opening of the throttle valve according to the condition of the pressure ratio of the air suction and the air discharge of the compressor, ensures that the compressor can normally return oil under the working condition of low pressure ratio, ensures the long-term stable operation of the compressor under the working condition of low pressure ratio, and can realize the free regulation and control of the pressure ratio of the compressor.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1: is a first control flow diagram of the embodiment of the invention;
FIG. 2: a control flow chart of the embodiment of the invention is shown as a second.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "contacting," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
When the unit operates at a low pressure ratio, the problem that the operation state of the unit is poor due to poor oil return and the energy efficiency is further reduced often occurs. In order to solve the problems of increased unit operation loss, reduced energy efficiency and even compressor scrapping caused by poor oil return of the compressor when the existing air conditioning unit operates under a low pressure ratio working condition, the present embodiment provides a compressor oil return control method, as shown in a control flow chart shown in fig. 1, which includes steps S1 to S2, wherein:
s1, obtaining the operation parameters of the air conditioning unit, and calculating the suction-discharge pressure ratio epsilon of the compressor according to the operation parameters;
s2, comparing the air suction-exhaust pressure ratio epsilon with the set air suction-exhaust pressure ratio epsilon0And adjusting the running speed of the outer fan and the opening of the throttle valve according to the comparison result.
This embodiment is mainly to the air conditioning unit who is in the low pressure ratio operating mode often, ensures that the compressor oil return is normal, and can long-term steady operation. The low pressure ratio condition of the present embodiment refers to that the compressor operates under a condition lower than the pressure ratio during normal operation, for example, the pressure ratio during normal operation of the compressor is 1.8, and the compressor is in the low pressure ratio condition when operating under the condition that the pressure ratio is 1.5. The operation parameters of the air conditioning unit are obtained when the air conditioner operates, and the operation parameters of the embodiment include a compressor pressure parameter or a temperature parameter. Then, the suction-discharge pressure ratio epsilon of the compressor is calculated according to the obtained operation parameters, and then the suction-discharge pressure ratio epsilon is compared with the set suction-discharge pressure ratio epsilon0When the air suction-exhaust pressure ratio epsilon is larger than the set air suction-exhaust pressure ratio epsilon0When the pressure is not lower than the set pressure, judging that the pressure is not lower than the set pressure0The air conditioner is judged to be in the low pressure ratio working condition at present, and the outer fan running rotating speed and the throttle valve opening degree are adjusted according to the judgment result so as to carry out oil return. The throttle valve of the present embodiment may alternatively be an electronic expansion valve.
In one embodiment, one of the methods for calculating the suction-to-discharge pressure ratio is:
acquiring the suction pressure and the exhaust pressure of the compressor, and calculating the suction-exhaust pressure ratio epsilon of the compressor to meet the following requirements: ε is the discharge pressure/suction pressure.
The second method for calculating the air suction-exhaust pressure ratio is as follows: acquiring condensation temperature and evaporation temperature, converting the condensation temperature and the evaporation temperature to obtain compressor exhaust pressure and suction pressure, and calculating the suction-exhaust pressure ratio epsilon of the compressor to meet the following requirements: ε is the discharge pressure/suction pressure. The conversion of the condensing temperature and the evaporating temperature into the compressor discharge pressure and the suction pressure is conventional in the art and will not be described in detail here.
Further optionally, wherein S2 includes S21, wherein:
s21, when the air suction-exhaust pressure ratio epsilon is less than or equal to the set air suction-exhaust pressure ratio epsilon0When the air suction and exhaust pressure ratio is in the working condition, after the air suction and exhaust pressure ratio is operated for a first time period t1, executing a first control process, wherein the first control process is to reduce the operation rotating speed of an outer fan and the opening of a throttle valve; when the air suction-exhaust pressure ratio epsilon is larger than the set air suction-exhaust pressure ratio epsilon0And keeping the current running state to continue running.
In this embodiment, when the air suction/discharge pressure ratio ε is less than or equal to the set air suction/discharge pressure ratio ε0The time shows that air conditioning unit current operating mode is the low pressure ratio operating mode, need carry out the oil return through reducing outer fan operation rotational speed, and the condensation temperature rises after outer fan rotational speed reduces, and condensation pressure rises, and air conditioning unit's pressure ratio grow to make the refrigerant velocity of flow increase, thereby drive the refrigeration machine oil on the pipe wall and flow and impel the refrigeration oil backward flow. The opening of the throttle valve is required to be synchronously reduced while the rotating speed is reduced, so that the condition of liquid impact of the compressor is avoided, and the suction superheat degree of the compressor is ensured to be within a set range. On the other hand, if the outdoor unit rotation speed and the throttle opening are adjusted immediately when the air conditioning unit is determined to be operated under the low pressure ratio condition, a large amount of refrigerant may suddenly enter the compressor to cause a liquid impact risk, and therefore, the external fan rotation speed Δ n needs to be reduced gradually while the electronic expansion valve opening Δ b needs to be reduced. When epsilon is greater than set air suction-exhaust pressure ratio epsilon0When the current working condition of the air conditioning unit is a non-low pressure ratio working condition, the refrigeration oil can realize normal backflow, the rotating speed of the outdoor fan and the opening of the throttle valve are not required to be adjusted, and the current running state is kept to continue running. In the present embodiment, the suction/discharge pressure ratio ε is set0Can be selected as0≤1.8。
The first time t1 may be a preset time period, or may be calculated according to the current intake-exhaust pressure ratio and the preset intake-exhaust pressure ratio. Generally, the operation time t1 of the air conditioning unit under the working condition of low pressure ratio is based on the actual pressure ratio epsilon and the preset pressure ratio epsilon0The difference between the two is determined to ensure the running time of the unit under the low pressure ratio, generally, the larger the difference is, the shorter the time length of the single running of the unit is required to be, namely, the more frequent the oil return program is run. Therefore, the first time period t1 satisfies: t1 ═ f (ε - ε0) (ii) a In one embodiment: the first time period t1 satisfies: t1 ═ a1-a2(ε - ε0) Wherein a1 and a2 are constants.
Further optionally, the step S2 further includes S22-S23, wherein
S22, after executing the first control process, continuing to compare the air suction-exhaust pressure ratio epsilon with the set air suction-exhaust pressure ratio epsilon0The size of (d);
s23, when epsilon is less than or equal to the set air suction-exhaust pressure ratio epsilon0When the first control process is executed, continuing to execute the first control process; when epsilon is greater than set air suction-exhaust pressure ratio epsilon0And executing a second control process after the air suction and exhaust pressure ratio is operated for a second time period t2 under the working condition, wherein the second control process is to increase the operating speed of the outer fan and increase the opening of the throttle valve.
In this embodiment, after the first control process, that is, after the rotation speed of the outdoor fan is reduced and the opening of the throttle valve is reduced, the operation parameters of the air conditioning unit are continuously obtained, the air suction/discharge pressure ratio epsilon of the compressor is calculated according to the operation parameters, and the air suction/discharge pressure ratio epsilon is compared with the set air suction/discharge pressure ratio epsilon0The size of (2). When the air suction-exhaust pressure ratio epsilon is larger than the set air suction-exhaust pressure ratio epsilon0The current working condition of the air conditioning unit is a non-low pressure ratio working condition, and the low pressure ratio working condition needs to be recovered by increasing the running rotating speed of the outer fan. When the air suction-exhaust pressure ratio epsilon is less than or equal to the set air suction-exhaust pressure ratio epsilon0And when the air conditioning unit is in the low pressure ratio working condition, returning to the control program to start, and controlling the air conditioning unit to operate for a time period t 1. The second time t2 is a preset time period.
The operation time t2 of the air conditioner unit under the working condition of the non-low pressure ratio is the time for the unit to execute the oil return program, generally, the oil return can be completed by running the oil return program for 5-10 min, so that the execution time of one oil return program is enough, and when the compressor runs under the working condition of the non-low pressure ratio, the non-low pressure ratio working condition (normal working condition) of the compressor running for the time t2 is timed according to the set program, so that stable high-speed airflow is formed in the pipeline to help oil return.
Further optionally, the step S2 further includes S24-S25, wherein
S24, after executing the second control process, the air suction-exhaust pressure ratio epsilon is continuously compared with the set air suction-exhaust pressure ratio epsilon0The size of (d);
s25, when epsilon is less than or equal to the set air suction-exhaust pressure ratio epsilon0When the air suction and exhaust pressure ratio is in the working condition, the first control process is executed after the air suction and exhaust pressure ratio is operated for a first time period t 1; when epsilon is greater than set air suction-exhaust pressure ratio epsilon0And continuing to execute the second control process.
In this embodiment, after the second control process, that is, after the rotation speed of the outdoor fan is increased and the opening of the throttle valve is increased, the operation parameters of the air conditioning unit are continuously obtained, the air suction/discharge pressure ratio epsilon of the compressor is calculated according to the operation parameters, and the air suction/discharge pressure ratio epsilon is compared with the set air suction/discharge pressure ratio epsilon0The size of (2). When the air suction-exhaust pressure ratio epsilon is less than or equal to the set air suction-exhaust pressure ratio epsilon0When the current working condition of the air conditioning unit is changed into the low pressure ratio working condition, the oil return is carried out by reducing the running rotating speed of the outer fan and reducing the opening degree of the throttle valve again after the current low pressure ratio working condition is kept and the air conditioning unit continues to run for t1 time. When the air suction-exhaust pressure ratio epsilon is larger than the set air suction-exhaust pressure ratio epsilon0And the condition that the current air conditioning unit is still in a non-low pressure ratio condition is described, so that the rotating speed of the fan needs to be further increased and the opening degree of the throttle valve needs to be increased so as to reduce the pressure ratio.
The following is a detailed implementation of the embodiment of the present invention, such as the control logic diagram shown in fig. 2: in the present embodiment, the discharge pressure and the suction pressure of the compressor are first detected to obtain the discharge-suction pressure ratio epsilon, which is the discharge pressure/suction pressure, and then the discharge-suction pressure ratio epsilon is set0If ε > ε, the comparison is made as 1.80If the air conditioning unit is considered to run under the working condition of non-low pressure ratio, the unit is kept to run continuously and stably, and meanwhile, the pressure and temperature parameters of the compressor are continuously detected; if ε is not more than ε0When the pressure ratio of the compressor is less than or equal to 1.8,and considering that the air conditioning unit operates under the low pressure ratio working condition, calculating the first time length t1, t1 equal to 240-.
Continuing to detect the running time t of the unit under the working condition of low pressure ratio, and if t is less than t1, keeping the unit running stably; when t is equal to or more than t1, the external fan speed Δ n is decreased to 10r/min, and the electronic expansion valve opening Δ b is decreased to 2.
Detecting the pressure ratio epsilon of suction and exhaust of the unit, if epsilon is less than or equal to epsilon0Repeating the previous step to reduce the rotating speed delta n of the external fan and simultaneously reduce the opening delta b of the electronic expansion valve; if epsilon>ε0And keeping the unit to stably operate for a second time period t2, wherein t2 is 10 min.
After the unit stably operates for a time period t2 at a non-low pressure ratio, the rotating speed delta n of the external fan is increased, and meanwhile the opening delta b of the electronic expansion valve is increased.
Detecting the pressure ratio epsilon of air suction and exhaust of the unit, if epsilon is more than epsilon0Repeating the previous step to increase the rotating speed delta n of the external fan and increase the opening delta b of the electronic expansion valve; if ε is not more than ε0And returning to the first step to re-run the control method.
The present embodiment also proposes a control device of an air conditioner, which includes one or more processors and a non-transitory computer-readable storage medium storing program instructions, when the one or more processors execute the program instructions, the one or more processors are configured to implement the method according to any one of claims 1 to 7.
The present embodiments also propose a non-transitory computer-readable storage medium having stored thereon program instructions for implementing the method according to any one of the above when the program instructions are executed by one or more processors.
The present embodiment also proposes an air conditioner employing the method of any one of the above, or comprising the control device described above, or having a non-transitory computer-readable storage medium according to the above.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An oil return control method for a compressor is characterized by comprising
Acquiring operation parameters of an air conditioning unit, and calculating the suction-exhaust pressure ratio epsilon of a compressor according to the operation parameters;
comparing the air suction-exhaust pressure ratio epsilon with the set air suction-exhaust pressure ratio epsilon0And adjusting the running speed of the outer fan and the opening of the throttle valve according to the comparison result.
2. The oil return control method for compressor as claimed in claim 1, wherein the comparison of the suction-to-discharge pressure ratio epsilon with the set suction-to-discharge pressure ratio epsilon0According to the comparison result, adjusting the running speed of the external fan and the opening of the throttle valve, including
When the air suction-exhaust pressure ratio epsilon is larger than the set air suction-exhaust pressure ratio epsilon0When the current running state is maintained, the running is continued;
when the air suction-exhaust pressure ratio epsilon is less than or equal to the set air suction-exhaust pressure ratio epsilon0And after the air suction and exhaust pressure ratio is operated for a first time period t1 under the working condition, executing a first control process, wherein the first control process is to reduce the operation speed of the outer fan and the opening degree of the throttle valve.
3. The oil return control method for compressor as claimed in claim 2, wherein the comparison of the suction-to-discharge pressure ratio epsilon with the set suction-to-discharge pressure ratio epsilon0According to the comparison result to regulate the running speed of external fan and throttle valve opening degree, also includes
In executionAfter the first control process, the air suction-exhaust pressure ratio epsilon is continuously compared with the set air suction-exhaust pressure ratio epsilon0The size of (d);
when epsilon is less than or equal to the set air suction-exhaust pressure ratio epsilon0When the first control process is executed, continuing to execute the first control process;
when epsilon is greater than set air suction-exhaust pressure ratio epsilon0And executing a second control process after the current air suction and exhaust pressure ratio is operated for a second time period t2 under the working condition, wherein the second control process is to increase the operating speed of the outer fan and the opening of the throttle valve.
4. The oil return control method for compressor as claimed in claim 3, wherein the comparison of the suction-to-discharge pressure ratio epsilon with the set suction-to-discharge pressure ratio epsilon0According to the comparison result to regulate the running speed of external fan and throttle valve opening degree, also includes
After the second control process is executed, the intake/exhaust pressure ratio epsilon is continuously compared with the set intake/exhaust pressure ratio epsilon0The size of (d);
when epsilon is less than or equal to the set air suction-exhaust pressure ratio epsilon0When the air suction and exhaust pressure ratio is in the working condition, the first control process is executed after the air suction and exhaust pressure ratio is operated for a first time period t 1;
when epsilon is greater than set air suction-exhaust pressure ratio epsilon0And continuing to execute the second control process.
5. The compressor oil return control method according to any one of claims 2 to 4, wherein the first time period t1 satisfies: t1 ═ f (ε - ε0)。
6. The compressor oil return control method according to claim 5, wherein the first time period t1 satisfies: t1 ═ a1-a2(ε - ε0) Wherein a1 and a2 are constants.
7. The method as claimed in claim 1, wherein the step of obtaining the operating parameters of the air conditioning unit and calculating the suction-discharge pressure ratio epsilon of the compressor according to the operating parameters comprises
Acquiring suction pressure and discharge pressure of a compressor; or acquiring a condensation temperature and an evaporation temperature, and converting the condensation temperature and the evaporation temperature to obtain the exhaust pressure and the suction pressure of the compressor;
calculating the suction-exhaust pressure ratio epsilon of the compressor, and satisfying the following conditions: ε is the discharge pressure/suction pressure.
8. A control apparatus of an air conditioner, comprising one or more processors and a non-transitory computer readable storage medium storing program instructions, the one or more processors being configured to implement the method according to any one of claims 1 to 7 when the program instructions are executed by the one or more processors.
9. A non-transitory computer-readable storage medium having stored thereon program instructions which, when executed by one or more processors, are to implement the method of any one of claims 1-7.
10. An air conditioner, characterized in that it employs the method of any one of claims 1-7, or comprises the control device of claim 8, or has a non-transitory computer-readable storage medium according to claim 9.
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| CN115451623A (en) * | 2022-08-31 | 2022-12-09 | 青岛海尔空调电子有限公司 | Pressure adjusting method and device of air conditioner and fixed-frequency air conditioner |
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| CN115451623B (en) * | 2022-08-31 | 2024-02-20 | 青岛海尔空调电子有限公司 | Pressure regulating method and device for air conditioner and fixed-frequency air conditioner |
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