CN109682035B - Oil return control method and air conditioning system - Google Patents
Oil return control method and air conditioning system Download PDFInfo
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- CN109682035B CN109682035B CN201811589299.3A CN201811589299A CN109682035B CN 109682035 B CN109682035 B CN 109682035B CN 201811589299 A CN201811589299 A CN 201811589299A CN 109682035 B CN109682035 B CN 109682035B
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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
- F24F11/50—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
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The invention discloses an oil return control method and an air conditioning system. The oil return control method is used for the air conditioning system. The oil return control method comprises the following steps: acquiring the return air superheat degree of a compressor and the outlet superheat degree of an indoor heat exchanger; and determining the oil return time interval of the air conditioning system according to the difference value of the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger. In the oil return control method, the oil return time interval of the air conditioning system is determined by the difference value of the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger, so that the air conditioning system can start an oil return mode according to a proper oil return time interval, the noise in the oil return process can be reduced, and the energy efficiency of the air conditioning system is improved.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to an oil return control method and an air conditioning system.
Background
In the related art multi-split air conditioning system, because the system pipeline is long and the number of internal units is large, when the system runs, the refrigeration oil can be accumulated in the system pipeline and the heat exchanger, and if the refrigeration oil is not returned in time, the system is lack of oil, so that the reliability of the compressor is endangered. Therefore, the multi-split system will usually force the system to enter the oil return mode according to the operation time. However, if the oil return is too frequent, the energy efficiency of the system is affected, and refrigerant noise is easily caused. Therefore, how to enable the multi-split air conditioning system to control oil return at proper time intervals becomes an urgent problem to be solved.
Disclosure of Invention
The embodiment of the invention provides an oil return control method and an air conditioning system.
The oil return control method is used for the air conditioning system. The air conditioning system comprises an indoor unit and an outdoor unit, the outdoor unit comprises a compressor, the indoor unit comprises an indoor heat exchanger, and the oil return control method comprises the following steps:
acquiring the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger;
and determining the oil return time interval of the air conditioning system according to the difference value between the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger, wherein the difference value between the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger is in negative correlation with the oil return time interval of the air conditioning system.
In the oil return control method, the oil return time interval of the air conditioning system is determined by the difference value between the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger, so that the air conditioning system can start an oil return mode according to a proper oil return time interval, the noise in the oil return process can be reduced, and the energy efficiency of the air conditioning system is improved.
In some embodiments, the outdoor unit includes a first temperature sensor, a pressure sensor and an outdoor reversing device, the first temperature sensor and the pressure sensor are disposed between the compressor and the outdoor reversing device, and the obtaining of the superheat degree of the return air of the compressor includes:
the first temperature sensor detects a first temperature;
the pressure sensor detects return air pressure and calculates corresponding saturation temperature according to the return air pressure;
the return air superheat degree of the compressor is the difference between the first temperature and the saturation temperature.
In some embodiments, the indoor unit includes an indoor heat exchanger, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, an indoor throttling element and an outdoor reversing device, and the obtaining of the outlet superheat degree of the indoor heat exchanger includes:
the second temperature sensor detects a second temperature of a first end of the indoor heat exchanger connected with the outdoor reversing device;
the third temperature sensor detects a third temperature at a second end of the indoor heat exchanger coupled to the indoor throttling element;
the fourth temperature sensor detects a fourth temperature between the first end and the second end of the indoor heat exchanger;
the superheat degree of an outlet of the indoor heat exchanger is the difference value of the second temperature and the third temperature; or the superheat degree of the outlet of the indoor heat exchanger is the difference value of the second temperature and the fourth temperature.
In some embodiments, determining the oil return time interval of the air conditioning system according to the difference between the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger comprises:
determining the length stage of a piping of the air conditioning system according to the difference value of the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger; and
and determining the oil return time interval of the air conditioning system according to the number of the length stages of the piping.
In some embodiments, the number of piping length stages corresponds to a time coefficient, and the difference is inversely related to the time coefficient;
the oil return time interval and the time coefficient are in positive correlation.
In some embodiments, the oil return time interval of the air conditioning system is a product of a preset time value and the time coefficient.
An embodiment of the present invention further provides an air conditioning system, including an indoor unit and an outdoor unit, where the outdoor unit includes a compressor, the indoor unit includes an indoor heat exchanger, and the air conditioning system includes:
the acquisition module is used for acquiring the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger;
the determining module is used for determining the oil return time interval of the air conditioning system according to the difference value of the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger.
In the air return system, the oil return time interval of the air conditioning system is determined by the difference value of the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger, so that the air conditioning system can start an oil return mode according to a proper oil return time interval, the noise in the oil return process can be reduced, and the energy efficiency of the air conditioning system is improved.
In some embodiments, the outdoor unit includes a first temperature sensor, a pressure sensor and an outdoor reversing device, the first temperature sensor and the pressure sensor are disposed between the compressor and the outdoor reversing device, and the first temperature sensor is configured to detect a first temperature; the pressure sensor is used for detecting return air pressure and calculating corresponding saturation temperature according to the return air pressure; the return air superheat degree of the compressor is the difference between the first temperature and the saturation temperature.
In some embodiments, the indoor unit comprises a second temperature sensor, a third temperature sensor, a fourth temperature sensor, an indoor throttling element and an outdoor reversing device, wherein the second temperature sensor is used for detecting a second temperature of a first end of the indoor heat exchanger connected with the outdoor reversing device; the third temperature sensor is used for detecting a third temperature of a second end of the indoor heat exchanger connected with the indoor throttling element; the fourth temperature sensor is used for detecting a fourth temperature between the first end and the second end of the indoor heat exchanger; the superheat degree of an outlet of the indoor heat exchanger is the difference value of the second temperature and the third temperature; or the superheat degree of the outlet of the indoor heat exchanger is the difference value of the second temperature and the fourth temperature.
In some embodiments, the determining module is configured to determine the number of piping length stages of the air conditioning system based on a difference between a return air superheat of the compressor and an outlet superheat of the indoor heat exchanger; and determining the oil return time interval of the air conditioning system according to the number of the length stages of the piping.
In some embodiments, the number of piping length stages corresponds to a time coefficient, and the difference is inversely related to the time coefficient; the oil return time interval and the time coefficient are in positive correlation.
In some embodiments, the oil return time interval of the air conditioning system is a product of a preset time value and the time coefficient.
The embodiment of the invention also provides an air conditioning system, which comprises an indoor unit, an outdoor unit, a processor and a memory, wherein the memory stores computer readable instructions, and when the instructions are executed by the processor, the processor executes the oil return control method of any one of the above embodiments.
In the air conditioning system, the oil return time interval of the air conditioning system is determined by the difference value between the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger, so that the air conditioning system can start an oil return mode according to a proper oil return time interval, the noise in the oil return process can be reduced, and the energy efficiency of the air conditioning system is improved.
Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flow chart of an oil return control method according to an embodiment of the present invention.
Fig. 2 is a block diagram of an air conditioning system according to an embodiment of the present invention.
Fig. 3 is a diagram of an operation path of the air conditioning system in the heating mode according to the embodiment of the present invention.
Fig. 4 is a diagram illustrating an operation path of the air conditioning system in the cooling mode according to the embodiment of the present invention.
Fig. 5 is another flow chart of the oil return control method according to the embodiment of the present invention.
Fig. 6 is a pressure enthalpy change diagram when the air conditioning system according to the embodiment of the present invention is operated.
Fig. 7 is another schematic flow chart of the oil return control method according to the embodiment of the present invention.
Fig. 8 is a schematic flow chart of an oil return control method according to the embodiment of the present invention.
Fig. 9 is another block diagram of an air conditioning system according to an embodiment of the present invention.
Description of the main element symbols:
the air conditioning system 100, the indoor unit 10, the second temperature sensor 12, the third temperature sensor 14, the fourth temperature sensor 16, the outdoor unit 20, the first temperature sensor 22, the pressure sensor 24, the obtaining module 30, the determining module 40, the compressor 110, the outdoor reversing device 120, the outdoor heat exchanger 130, the outdoor throttling element 140, the indoor throttling element 150, the indoor heat exchanger 160, the processor 220, the storage 210, and the internal storage 250.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, embodiments of the invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, embodiments of the present invention provide examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
Referring to fig. 1 and 2, an oil return control method according to an embodiment of the present invention may be applied to an air conditioning system 100. The air conditioning system 100 includes an indoor unit 10 and an outdoor unit 20, and the oil return control method includes:
step S10, acquiring the return air superheat degree of the compressor 110 and the outlet superheat degree of the indoor heat exchanger 160;
in step S20, an oil return time interval of the air conditioning system 100 is determined according to the difference between the return air superheat degree of the compressor 110 and the outlet superheat degree of the indoor heat exchanger 160.
The oil return control method implemented by the invention can be realized by the air conditioning system 100 implemented by the invention. The air conditioning system 100 includes an acquisition module 30 and a determination module 40. Wherein, the step S10 can be realized by the obtaining module 30. Step S20 may be implemented by determination module 40. The obtaining module 30 is used for obtaining the return air superheat degree of the compressor 110 and the outlet superheat degree of the indoor heat exchanger 160. The determination module 40 is configured to determine an oil return time interval of the air conditioning system 100 according to a difference between a return air superheat of the compressor 110 and an outlet superheat of the indoor heat exchanger 160.
In the oil return control method according to the embodiment of the present invention, the oil return time interval of the air conditioning system 100 is determined by the difference between the return air superheat degree of the compressor 110 and the outlet superheat degree of the indoor heat exchanger 160, so that the air conditioning system 100 can start the oil return mode according to the appropriate oil return time interval, thereby reducing the noise in the oil return process and improving the energy efficiency of the air conditioning system 100.
Specifically, the outdoor unit 20 includes a compressor 110, an outdoor reversing device 120, an outdoor heat exchanger 130, and an outdoor throttling element 140. The indoor unit 10 includes an indoor throttling element 150 and an indoor heat exchanger 160. In the air conditioning system 100 of the present embodiment, one, two, or more indoor units 10 may be provided in the outdoor unit 20.
Referring to fig. 3, in an embodiment, the air conditioning system 100 is in a heating operation mode, a liquid refrigerant in the compressor 110 is compressed to generate a high-temperature and high-pressure gaseous refrigerant, the high-temperature and high-pressure gaseous refrigerant enters the indoor heat exchanger 160 through the outdoor reversing device 120, the high-temperature and high-pressure gaseous refrigerant is condensed into a liquid refrigerant in the indoor heat exchanger 160, the liquid refrigerant is changed into a two-phase refrigerant (coexisting in a gas-liquid state) after passing through the indoor throttling element 150 and the outdoor throttling element 140, the two-phase refrigerant evaporates and absorbs heat in the outdoor heat exchanger 130 to be changed into a gaseous refrigerant, and the gaseous refrigerant returns to an inlet of the compressor 110 through the.
Referring to fig. 4, in another embodiment, the air conditioning system 100 is in a cooling operation mode, a liquid refrigerant in the compressor 110 is compressed to generate a high-temperature and high-pressure gaseous refrigerant, the high-temperature and high-pressure gaseous refrigerant enters the outdoor heat exchanger 130 through the outdoor reversing device 120, the high-temperature and high-pressure gaseous refrigerant is condensed in the outdoor heat exchanger 130 to become a high-pressure liquid refrigerant, the high-pressure liquid refrigerant passes through the outdoor throttling element 140 to reach the indoor throttling element 150 for throttling, and then becomes a two-phase refrigerant (gas-liquid coexisting), the two-phase refrigerant is evaporated and heat exchanged in the indoor heat exchanger 160 to become a gaseous refrigerant, and the gaseous refrigerant returns to an inlet of the compressor 110 through the outdoor reversing device 120.
Specifically, the degree of superheat refers to the degree to which the steam temperature is higher than the saturation temperature at the corresponding pressure. The higher the pressure corresponding to the water vapor, the higher the saturation temperature of the corresponding water. The degree of superheat of the return air of the compressor 110 can be understood as: the difference between the saturation temperature corresponding to the pressure of the gaseous refrigerant returning to the point a' of the inlet of the compressor 110 through the outdoor reversing device 120 and the actual temperature at the point. The outlet superheat of the indoor heat exchanger 160 can be understood as: the difference between the saturation temperature corresponding to the gas pressure of the gaseous refrigerant at the point a of the indoor heat exchanger 160 and the actual temperature at that point.
It should be noted that the saturation temperature corresponding to the position where the two-phase refrigerant is located is the same as the corresponding actual temperature.
Referring to fig. 5, in some embodiments, the outdoor unit 20 includes a first temperature sensor 22 and a pressure sensor 24, the first temperature sensor 22 and the pressure sensor 24 are disposed between the compressor 110 and the outdoor reversing device 120, and the step S10 includes:
step S12, the first temperature sensor 22 detects a first temperature;
step S14, the pressure sensor 24 detects the return air pressure;
step S16, calculating the corresponding saturation temperature according to the return air pressure;
the oil return control method implemented as described above can be implemented by the air conditioning system 100 implemented in the present invention. Wherein step S12 can be implemented by the first temperature sensor 22. Step S14 may be implemented by pressure sensor 24. Step S16 may be implemented by the obtaining module 30. That is, the first temperature sensor 22 is used to detect a first temperature; the pressure sensor 24 is used for detecting the return air pressure and calculating the corresponding saturation temperature according to the return air pressure. The superheat of the return air of the compressor 110 is the difference between the first temperature and the saturation temperature.
In this way, the degree of superheat of the returned air of the compressor 110 is calculated from the first temperature detected by the first temperature sensor 22 and the returned air pressure detected by the pressure sensor 24, which makes the detected data accurate and convenient, thereby making the acquired degree of superheat of the returned air of the compressor 110 accurate.
Specifically, referring to fig. 4, the first temperature sensor 22 and the pressure sensor 24 may be disposed at the inlet a' point of the compressor 110. The first temperature is an actual temperature at a point a 'of an inlet of the compressor 110, the return air pressure detected by the pressure sensor 24 is a pressure of the gaseous refrigerant of the return air pressure detected by the pressure sensor 24, the saturation temperature at the point a' can be calculated according to the return air pressure, and the return air superheat degree of the compressor 110 can be obtained according to a difference between the saturation temperature at the point a 'and the actual temperature at the point a'.
Referring to fig. 5, in some embodiments, the indoor unit 10 includes a second temperature sensor 12, a third temperature sensor 14, and a fourth temperature sensor 16, the compressor 110, the outdoor reversing device 120, the indoor heat exchanger 160, the indoor throttling element 150, the outdoor throttling element 140, the outdoor heat exchanger 130, the outdoor reversing device 120, and the compressor 110 are sequentially connected to form a circulation pipeline, and the step S10 includes:
step S11, the second temperature sensor 12 detects a second temperature of the first end of the indoor heat exchanger 160 connected to the outdoor reversing device 120;
in step S13, the third temperature sensor 14 detects a third temperature at the second end of the indoor heat exchanger 160 connected to the indoor throttling element 150;
step S15, the fourth temperature sensor 16 detects a fourth temperature between the first end and the second end of the indoor heat exchanger 160;
the oil return control method implemented as described above can be implemented by the air conditioning system 100 implemented in the present invention. Wherein step S11 can be implemented by the second temperature sensor 12. The step S13 may be implemented by the third temperature sensor 14, and the step S15 may be implemented by the fourth temperature sensor 16. That is, the second temperature sensor 12 is used to detect the second temperature of the indoor heat exchanger 160. The third temperature sensor 14 is for detecting a third temperature of the indoor heat exchanger 160. The fourth temperature sensor 16 is for detecting a fourth temperature of the indoor heat exchanger 160. In one embodiment, the outlet superheat of the indoor heat exchanger 160 is the difference between the second temperature of the indoor heat exchanger 160 and the third temperature of the indoor heat exchanger 160. In another embodiment, the outlet superheat of the indoor heat exchanger 160 is the difference between the second temperature of the indoor heat exchanger 160 and the fourth temperature of the indoor heat exchanger 160.
In the present embodiment, the second temperature is the air pipe temperature of the indoor heat exchanger 160. The liquid pipe temperature of the third temperature indoor heat exchanger 160. The fourth temperature is a middle temperature of the indoor heat exchanger 160.
Specifically, referring to fig. 4, a second sensor is disposed at the first end D1 of the indoor heat exchanger 160, a third sensor is disposed at the second end D2 of the indoor heat exchanger 160, and a fourth sensor is disposed at D3 of the indoor heat exchanger 160. When the air conditioning system 100 is in the cooling mode, the point D2 at the second end of the indoor heat exchanger 160 is an inlet of the two-phase refrigerant throttled by the indoor throttling element 150, and the point D1 at the first end of the indoor heat exchanger 160 is a gaseous refrigerant coming out of the indoor heat exchanger 160. The refrigerant state at the point D3 of the indoor heat exchanger 160 is also a two-phase refrigerant.
It should be noted that, since the refrigerant states at the third end D3 of the indoor heat exchanger 160 and the second end D2 of the indoor heat exchanger 160 are two-phase states, the actual temperatures detected at the third end D3 of the indoor heat exchanger 160 and the second end D2 of the indoor heat exchanger 160 can be understood as the saturation temperatures corresponding to the indoor heat exchanger 160.
Further, since the pressure sensor is not present in the indoor unit 10, the saturation temperature corresponding to the indoor heat exchanger 160 can be obtained by directly obtaining the actual temperatures detected at the third end D3 of the indoor heat exchanger 160 and the second end D2 of the indoor heat exchanger 160. Then, in one embodiment, the outlet superheat of the indoor heat exchanger 160 is the difference between the second temperature of the indoor heat exchanger 160 and the third temperature of the indoor heat exchanger 160. In another embodiment, the outlet superheat of the indoor heat exchanger 160 is the difference between the second temperature of the indoor heat exchanger 160 and the fourth temperature of the indoor heat exchanger 160.
Referring to fig. 4 and 6, in one embodiment, the air conditioning system is in a cooling mode. As can be seen from the pressure-enthalpy diagram corresponding to the air conditioner, a 'B' is the actual compression process of the compressor 110, B 'C is the condensation process of the outdoor heat exchanger 130, CD is the throttling process of the outdoor throttling element 140 and the indoor throttling element 150, DA is the evaporation process of the indoor heat exchanger 160, and AA' is the pressure drop process between the pipes of the air conditioning system 100. The point a' corresponds to a first temperature detected by the first temperature sensor 22. Tp1 corresponds to the saturation temperature corresponding to the return air pressure detected by the pressure sensor 24. The point a corresponds to the second temperature detected by the second temperature sensor 12, and the point Tp2 corresponds to the third temperature detected by the third temperature sensor 14 or the fourth temperature detected by the fourth temperature sensor 16.
It should be noted that the larger the difference between the return air superheat SSH of the compressor 110 and the outlet superheat SH of the indoor heat exchanger 160, the larger the pressure drop of the piping between the AA' of the air conditioning system 100. In the present embodiment, the oil return time interval of the air conditioning system 100 may be determined by the difference between the return air superheat SSH of the compressor 110 and the outlet superheat SH of the indoor heat exchanger 160, so that the oil return mode is started at a proper oil return time interval, and the reliability of the compressor 110 may be prevented from being affected by too little refrigerant oil due to long-time operation of the compressor 110.
Referring to fig. 7, in some embodiments, step S20 includes:
The oil return control method according to the above embodiment may be implemented by the air conditioning system 100. Both step 22 and step S24 can be implemented by the determining module 40. That is, the determining module 40 is configured to determine the number of piping length stages of the air conditioning system 100 according to the difference between the return air superheat degree of the compressor 110 and the outlet superheat degree of the indoor heat exchanger; and determining the oil return time interval of the air conditioning system 100 according to the number of the length stages of the pipes.
In this manner, the oil return time interval of the air conditioning system is determined by the number of piping length stages, which allows the air conditioning system 100 to start the oil return mode according to the appropriate oil return time interval.
In some embodiments, the oil return time interval of the air conditioning system 100 is a product of a preset time value and a time coefficient.
In some embodiments, the number of piping lengths corresponds to a time coefficient, and the difference between the superheat of the return air of the compressor 110 and the superheat of the outlet of the indoor heat exchanger 160 is inversely related to the time coefficient. The oil return time interval and the time coefficient are in positive correlation.
It will be appreciated that the length of the tubing may be expressed in terms of the number of tubing length stages. The longer the length of the piping, the greater the number of piping length steps, indicating a greater pressure drop across the piping between AA's of the air conditioning system 100. The larger the number of piping length stages is, the smaller the corresponding time coefficient is, and the oil return time interval may be a preset time value multiplied by the time coefficient. That is, the larger the number of the piping length steps is, the smaller the time coefficient is, and the smaller the time coefficient is, the smaller the corresponding oil return time interval is, so that the air conditioning system 100 performs oil return at a shorter oil return time interval when the number of the piping length steps is larger, and it is possible to prevent the reliability of the compressor 110 from being affected by too little refrigerant oil due to long-time operation of the compressor 110.
Referring to fig. 8, in some embodiments, step S22 includes:
step S110, determining whether a difference between a return air superheat degree of the compressor 110 and an outlet superheat degree of the indoor heat exchanger 160 is greater than or equal to a first preset temperature;
step S112, when the difference value is larger than the first preset temperature, determining the length of the first-stage piping of the air conditioning system 100 as a first-stage piping, wherein the first-stage piping corresponds to a first time coefficient;
when the difference is not greater than the first preset temperature, step S120, determining whether the difference between the return air superheat degree of the compressor 110 and the outlet superheat degree of the indoor heat exchanger 160 is greater than or equal to a second preset temperature;
when the difference is greater than or equal to the second preset temperature, step S122, determining the number of stages of the length of the piping of the air conditioning system 100 as a second-stage piping, where the second-stage piping corresponds to a second time coefficient;
when the difference is less than the second preset temperature, step S130, determining whether the difference between the return air superheat of the compressor 110 and the outlet superheat of the indoor heat exchanger 160 is greater than or equal to a third preset temperature;
step S132, when the difference is greater than or equal to a third preset temperature, determining the length of the pipe of the air conditioning system 100 is in the number of stages of a three-stage pipe, and the three-stage pipe corresponds to a third time coefficient;
in step S134, when the difference is smaller than the third preset temperature, it is determined that the number of stages of the length of the piping of the air conditioning system 100 is four, and the four stages of the piping correspond to the fourth coefficient.
In certain embodiments, step S24 includes:
when the number of the piping length stages of the air conditioning system is a first-stage piping, step S114, determining the oil return time interval of the air conditioning system to be the product of a preset time value and a first time coefficient;
when the number of the piping length stages of the air conditioning system is a secondary piping, step S124, determining the oil return time interval of the air conditioning system to be the product of the preset time value and the second time coefficient;
when the number of the piping length stages of the air conditioning system is three-stage piping, step S133, determining the oil return time interval of the air conditioning system to be the product of the preset time value and the third time coefficient;
when the number of the piping length stages of the air conditioning system is four, in step S135, the oil return time interval of the air conditioning system is determined to be the product of the preset time value and the fourth time coefficient.
The first preset temperature is higher than the second preset temperature, and the second preset temperature is higher than the third preset temperature;
the first coefficient is smaller than the second coefficient, the second coefficient is smaller than the third coefficient, and the third coefficient is smaller than the fourth coefficient.
The oil return control method according to the above embodiment may be implemented by the air conditioning system 100. Step S110, step S112, step S114, step S120, step S122, step S124, step S130, step S132, step S133, step S134 and step S135 may all be implemented by the determination module 40. That is, when the difference is greater than or equal to the first preset value, the determining module 40 is configured to determine that the number of stages of the length of the piping of the air conditioning system 100 is one stage of piping, where the one stage of piping corresponds to the first time coefficient; when the difference is greater than or equal to the second preset value and less than the first preset value, the determining module 40 is configured to determine that the number of stages of the length of the piping of the air conditioning system 100 is a second-stage piping, and the second-stage piping corresponds to a second time coefficient; when the difference is greater than or equal to a third preset value and less than a second preset value, the determining module 40 is configured to determine that the number of stages of the length of the piping of the air conditioning system 100 is a third-stage piping, where the third-stage piping corresponds to a third time coefficient; when the difference is smaller than the third preset value, the determining module 40 is configured to determine that the number of stages of the length of the piping of the air conditioning system 100 is four, and the four stages of the piping correspond to a fourth coefficient; when the number of the piping length stages of the air conditioning system 100 is a first-stage piping, the determining module 40 is configured to determine that the oil return time interval of the air conditioning system 100 is a product of a preset time value and a first time coefficient; when the number of the piping length stages of the air conditioning system 100 is a secondary piping, the determining module 40 is configured to determine that the oil return time interval of the air conditioning system 100 is a product of a preset time value and a second time coefficient; when the number of the piping length stages of the air conditioning system 100 is three-stage piping, the determining module 40 is configured to determine that the oil return time interval of the air conditioning system 100 is a product of a preset time value and a third time coefficient; when the number of the piping length stages of the air conditioning system 100 is four, the determining module 40 is configured to determine that the oil return time interval of the air conditioning system 100 is a product of a preset time value and a fourth time coefficient; the determining module 40 is configured to determine that the first preset temperature is higher than a second preset temperature, and the second preset temperature is higher than a third preset temperature; the first coefficient is smaller than the second coefficient, the second coefficient is smaller than the third coefficient, and the third coefficient is smaller than the fourth coefficient.
In this way, the number of the piping length stages of the air conditioning system 100 and the corresponding time coefficient are determined by the difference between the return air superheat degree of the compressor 110 and the outlet superheat degree of the indoor heat exchanger 160, and the oil return time interval of the air conditioning system 100 is determined according to the time coefficient, so that the appropriate oil return time interval of the air conditioning system 100 can be obtained.
It is to be noted that the number of piping length stages of the first-stage piping is greater than that of the second-stage piping, the number of piping length stages of the second-stage piping is greater than that of the third-stage piping, and the number of piping length stages of the third-stage piping is greater than that of the fourth-stage piping.
The oil return control method according to the present embodiment may be configured to have a plurality of stages for the number of stages of the length of the pipe, and is not limited to the above-described example in which the number of stages of the length of the pipe is divided into four stages.
Specifically, in one embodiment, the difference between the return air superheat SSH of the compressor 110 and the outlet superheat SH of the indoor heat exchanger 160 is Δ T, the preset time interval is T, the first preset temperature is T1, the second preset temperature is T2, the third preset temperature is T3, the fourth preset temperature is T4, the first coefficient is a1, the second coefficient is a2, the third coefficient is a3, and the fourth coefficient is a 4. If Δ T > T1 ℃ (e.g., 15 ℃), the number of stages of the length of the piping of the air conditioning system 100 is determined to be one stage of piping, the first stage of piping is an ultra-long piping system, the oil return time interval of the air conditioning system 100 is determined to be the product of the preset time interval T and the first coefficient a1, and a1 may be 0.6. If T2 ℃. ≦ Δ T < T1 ℃ (e.g., 10 ℃. ≦ Δ T < 15 ℃), the number of stages of the length of the piping of the air conditioning system 100 is determined to be a secondary piping, the secondary piping is a long piping system, the oil return time interval of the air conditioning system 100 is determined to be the product of the preset time interval T and the first coefficient a2, and a2 may be 0.8. If the T3 ℃ is more than or equal to delta T and less than the T2 ℃ (5 ℃ is more than or equal to delta T and less than 10 ℃), the length of the tubing of the air-conditioning system 100 is determined to be a three-stage tubing, the three-stage tubing is a standard tubing, the oil return time interval of the air-conditioning system 100 is determined to be the product of the preset time interval T and a first coefficient a3, and a3 can be 1. If Δ T < T3 ℃ (Δ T < 5 ℃), the number of stages of the length of the piping of the air conditioning system 100 is determined to be four-stage piping, the four-stage piping is determined to be a short piping, the oil return time interval of the air conditioning system 100 is determined to be the product of the preset time interval T and the first coefficient a4, and a4 may be 1.4.
In one embodiment, if the air conditioning system 100 is in the cooling operation mode, and the oil return mode needs to be started at this time, the operation in the cooling operation mode may be continued, and all the electronic expansion valves of the outdoor unit 20 are opened. In another embodiment, if the air conditioning system 100 is in the heating operation mode, if the oil return mode needs to be started, the heating operation mode needs to be switched to the cooling operation mode, the fans in the indoor units 10 are controlled to be turned off, the electronic expansion valves of the indoor units 10 are all opened, and the electronic expansion valves of the outdoor units 20 can be opened or closed. It should be noted that the path of the refrigerant oil in the oil return mode of the air conditioning system 100 coincides with the path of the refrigerant when the air conditioning system 100 operates in the cooling operation mode.
Referring to fig. 9, an air conditioning system 100 is further provided according to an embodiment of the present invention. The air conditioning system 100 includes an indoor unit 10, an outdoor unit 20, a processor 220, and a memory 210, where the memory 210 stores computer readable instructions, and when the instructions are executed by the processor 200, the processor 220 executes the oil return control method according to any of the embodiments. For example, step S10 is executed to acquire the return air superheat of the compressor 110 and the outlet superheat of the indoor heat exchanger 160; and step S20, determining the oil return time interval of the air conditioning system 100 according to the difference between the return air superheat degree of the compressor 110 and the outlet superheat degree of the indoor heat exchanger 160.
In the air conditioning system 100 according to the embodiment of the present invention, the oil return time interval of the air conditioning system 100 is determined by the difference between the return air superheat of the compressor 110 and the outlet superheat of the indoor heat exchanger 160, so that the air conditioning system 100 can start the oil return mode according to the appropriate oil return time interval, thereby reducing the noise during the oil return process and improving the energy efficiency of the air conditioning system 100.
Fig. 9 is a schematic diagram of internal modules of the air conditioning system 100 in one embodiment. The air conditioning system 100 includes a processor 220, a memory 210 (for example, a nonvolatile storage medium), an internal memory 250, an indoor unit 10, and an outdoor unit 20, which are connected to each other by a system bus 230. Wherein the memory 210 of the air conditioning system 100 stores an operating system and computer readable instructions. The computer readable instructions can be executed by the processor 220 to implement the screen capture method of any of the above embodiments. The processor 220 may be used to provide computing and control capabilities that support the operation of the overall computer device. Internal memory 250 provides an environment for the execution of computer-readable instructions in memory 210. Those skilled in the art will appreciate that the configuration shown in fig. 9 is merely a schematic illustration of a portion of the configuration associated with the present application and is not intended to limit the air conditioning system 100 to which the present application may be applied, and that a particular air conditioning system 100 may include more or less components than those shown, or some components may be combined, or have a different arrangement of components.
In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like mean 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 invention. In this specification, schematic representations of the above terms 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.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processing module-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection having one or more wires (control method), a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of embodiments of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (13)
1. An oil return control method is used for an air conditioning system, the air conditioning system comprises an indoor unit and an outdoor unit, the outdoor unit comprises a compressor, the indoor unit comprises an indoor heat exchanger, and the oil return control method comprises the following steps:
acquiring the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger;
and determining the oil return time interval of the air conditioning system according to the difference value between the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger, wherein the difference value between the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger is in negative correlation with the oil return time interval of the air conditioning system.
2. The oil return control method of claim 1, wherein the outdoor unit includes a first temperature sensor, a pressure sensor, and an outdoor reversing device, the first temperature sensor and the pressure sensor are disposed between the compressor and the outdoor reversing device, and the obtaining of the superheat of the return air of the compressor comprises:
the first temperature sensor detects a first temperature;
the pressure sensor detects return air pressure and calculates corresponding saturation temperature according to the return air pressure;
the return air superheat degree of the compressor is the difference between the first temperature and the saturation temperature.
3. The oil return control method according to claim 1, wherein the indoor unit includes a second temperature sensor, a third temperature sensor, a fourth temperature sensor, an indoor throttling element, and an outdoor reversing device, and the obtaining of the outlet superheat degree of the indoor heat exchanger includes:
the second temperature sensor detects a second temperature of a first end of the indoor heat exchanger connected with the outdoor reversing device;
the third temperature sensor detects a third temperature at a second end of the indoor heat exchanger coupled to the indoor throttling element;
the fourth temperature sensor detects a fourth temperature between the first end and the second end of the indoor heat exchanger;
the superheat degree of an outlet of the indoor heat exchanger is the difference value of the second temperature and the third temperature; or the superheat degree of the outlet of the indoor heat exchanger is the difference value of the second temperature and the fourth temperature.
4. The oil return control method of claim 1, wherein determining the oil return time interval of the air conditioning system based on the difference between the return air superheat of the compressor and the outlet superheat of the indoor heat exchanger comprises:
determining the length stage of a piping of the air conditioning system according to the difference value of the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger; and
and determining the oil return time interval of the air conditioning system according to the number of the length stages of the piping.
5. The oil return control method according to claim 4, wherein the number of piping length stages corresponds to a time coefficient, and the difference is inversely related to the time coefficient;
the oil return time interval and the time coefficient are in positive correlation.
6. The oil return control method of claim 5, wherein the oil return time interval of the air conditioning system is a product of a preset time value and the time coefficient.
7. An air conditioning system, includes indoor set and off-premises station, its characterized in that, the off-premises station includes the compressor, indoor set includes indoor heat exchanger, air conditioning system includes:
the acquisition module is used for acquiring the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger;
the determining module is used for determining the oil return time interval of the air conditioning system according to the difference value between the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger, and the difference value between the return air superheat degree of the compressor and the outlet superheat degree of the indoor heat exchanger is in a negative correlation relation with the oil return time interval of the air conditioning system.
8. The air conditioning system as claimed in claim 7, wherein the outdoor unit includes a first temperature sensor, a pressure sensor, and an outdoor reversing device, the first temperature sensor and the pressure sensor being disposed between the compressor and the outdoor reversing device, the first temperature sensor being configured to detect a first temperature; the pressure sensor is used for detecting return air pressure and calculating corresponding saturation temperature according to the return air pressure; the return air superheat degree of the compressor is the difference between the first temperature and the saturation temperature.
9. The air conditioning system as claimed in claim 7, wherein the indoor unit includes a second temperature sensor for detecting a second temperature of the first end of the indoor heat exchanger connected to the outdoor reversing device, a third temperature sensor, a fourth temperature sensor, an indoor throttling element, and an outdoor reversing device; the third temperature sensor is used for detecting a third temperature of a second end of the indoor heat exchanger connected with the indoor throttling element; the fourth temperature sensor is used for detecting a fourth temperature between the first end and the second end of the indoor heat exchanger; the superheat degree of an outlet of the indoor heat exchanger is the difference value of the second temperature and the third temperature; or the superheat degree of the outlet of the indoor heat exchanger is the difference value of the second temperature and the fourth temperature.
10. The air conditioning system as claimed in claim 7, wherein the determining module is configured to determine the number of piping lengths of the air conditioning system based on a difference between a return air superheat of the compressor and an outlet superheat of the indoor heat exchanger; and determining the oil return time interval of the air conditioning system according to the number of the length stages of the piping.
11. The air conditioning system of claim 10, wherein said number of piping length steps corresponds to a time factor, and said difference is inversely related to said time factor; the oil return time interval and the time coefficient are in positive correlation.
12. The air conditioning system as claimed in claim 11, wherein the oil return time interval of the air conditioning system is a product of a preset time value and the time coefficient.
13. An air conditioning system comprising an indoor unit, an outdoor unit, a processor, and a memory, wherein the memory stores computer readable instructions, which when executed by the processor, cause the processor to perform the oil return control method of any one of claims 1 to 6.
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| CN201811589299.3A CN109682035B (en) | 2018-12-25 | 2018-12-25 | Oil return control method and air conditioning system |
| PCT/CN2019/089085 WO2020133902A1 (en) | 2018-12-25 | 2019-05-29 | Oil return control method and air conditioning system |
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| CN201811589299.3A CN109682035B (en) | 2018-12-25 | 2018-12-25 | Oil return control method and air conditioning system |
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| CN109682035B (en) * | 2018-12-25 | 2020-08-04 | 广东美的暖通设备有限公司 | Oil return control method and air conditioning system |
| CN112361538B (en) * | 2020-11-25 | 2022-01-28 | 珠海格力电器股份有限公司 | Oil return control method and device and multi-split system |
| CN114198807B (en) * | 2021-11-19 | 2023-06-20 | 青岛海尔空调电子有限公司 | Self-adaptive control method and device for multi-connected air conditioning unit, air conditioning unit and medium |
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