CN112361538B - Oil return control method and device and multi-split system - Google Patents
Oil return control method and device and multi-split system Download PDFInfo
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- CN112361538B CN112361538B CN202011345346.7A CN202011345346A CN112361538B CN 112361538 B CN112361538 B CN 112361538B CN 202011345346 A CN202011345346 A CN 202011345346A CN 112361538 B CN112361538 B CN 112361538B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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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
Abstract
The invention discloses an oil return control method, an oil return control device and a multi-split system, wherein the method comprises the following steps: determining the average length, a first correction coefficient and a second correction coefficient of a connecting pipe between the internal machine and the external machine according to the system operation parameters; determining corresponding oil return priority based on the average length of the connecting pipe, the first correction coefficient and the second correction coefficient; and controlling oil return operation of the multi-split air conditioning system based on the oil return priority. The oil return control method, the oil return control device and the multi-split system provided by the invention can determine different oil return priorities according to the actual engineering situation, ensure that the oil return priorities are reasonably and reliably designed, realize accurate oil return, ensure that the unit returns oil when needed, and avoid the phenomenon that the unit is sufficient in oil quantity but the oil is returned frequently or the unit is short of oil but the oil is not returned timely.
Description
Technical Field
The invention relates to the technical field of air conditioner oil return control, in particular to an oil return control method, an oil return control device and a multi-split system.
Background
The multi-split air conditioner is characterized in that the indoor units are arranged in a multi-split air conditioner, the indoor units are connected with the outdoor units through the connecting pipes, and the indoor units are connected with the indoor units through the connecting pipes.
The traditional multi-split air conditioner has a single oil return control mode, and oil return operation frequently occurs during refrigeration or heating operation, so that the comfort of users is seriously affected, and more noise complaints are caused; frequent oil return also results in increased operating energy consumption. The oil return control of the traditional multi-split air conditioner is designed based on the conventional situation, and differential setting is not carried out according to different actual projects.
Aiming at the problem that different differential oil return schemes cannot be provided for specific actual engineering during oil return in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides an oil return control method, an oil return control device and a multi-split system, and aims to solve the problem that in the prior art, a differential oil return scheme is not provided according to the actual engineering situation during oil return.
In order to solve the technical problem, the invention provides an oil return control method, which is applied to a multi-split system, and comprises the following steps:
determining the average length, a first correction coefficient and a second correction coefficient of a connecting pipe between the internal machine and the external machine according to the system operation parameters;
determining corresponding oil return priority based on the average length of the connecting pipe, the first correction coefficient and the second correction coefficient;
and controlling oil return operation of the multi-split air conditioning system based on the oil return priority.
Further, the determining the average length of the connecting pipes between the inner unit and the outer unit, the first correction coefficient and the second correction coefficient according to the system operation parameters specifically includes:
determining the average length of connecting pipes between the internal machine and the external machine according to the system temperature parameters;
determining a first correction coefficient according to the number of the internal machines in the system;
and determining a second correction coefficient according to the capacity ratio of the internal machine to the external machine.
Further, in the refrigeration debugging mode, the determining the average length of the connecting pipes between the internal unit and the external unit according to the system temperature parameters specifically includes:
calculating the difference between the inlet pipe temperature of each indoor unit and the average low-pressure saturation temperature of the system;
the average length of the connection pipe between the inner and outer units is determined based on the difference and the outdoor ambient temperature.
Further, in the heating commissioning mode, the determining an average length of the connection pipe between the inner unit and the outer unit according to the system temperature parameter specifically includes:
calculating the difference between the outlet pipe temperature of each indoor unit and the liquid outlet temperature of the outdoor unit;
the average length of the connection pipe between the inner and outer units is determined based on the difference and the outdoor ambient temperature.
Further, the determining the corresponding oil return priority based on the average length of the connection pipe, the first correction coefficient, and the second correction coefficient specifically includes:
calculating an oil return priority judgment parameter based on the average length of the connecting pipe, the first correction coefficient and the second correction coefficient;
and determining the corresponding oil return priority based on the oil return priority judgment parameter.
Further, the controlling the oil return operation of the multi-split air conditioning system based on the oil return priority specifically includes:
determining a corresponding oil return period and oil return duration based on the oil return priority;
and controlling the oil return operation of the multi-split air conditioning system based on the oil return period and the oil return duration.
In order to achieve the above object, the present invention further provides an oil return control device, which is applied to a multi-split system, and the device includes:
the first determining module is used for determining the average length of connecting pipes between the inner machine and the outer machine, a first correction coefficient and a second correction coefficient according to the system operation parameters;
the second determining module is used for determining corresponding oil return priority based on the average length of the connecting pipe, the first correction coefficient and the second correction coefficient;
and the control module is used for controlling oil return operation of the multi-split air conditioning system based on the oil return priority.
Further, the first determining module specifically includes:
the first determining unit is used for determining the average length of connecting pipes between the inner machine and the outer machine according to the system temperature parameters;
the second determining unit is used for determining a first correction coefficient according to the number of the internal machines in the system;
and the third determining unit is used for determining a second correction coefficient according to the capacity ratio of the internal machine to the external machine.
Further, in the refrigeration debugging mode, the first determining unit specifically includes:
the first calculating subunit is used for calculating the difference value between the inlet pipe temperature of each indoor unit and the average low-pressure saturation temperature of the system;
and a first determining subunit for determining an average length of the connecting pipe between the inner and outer units based on the difference and the outdoor ambient temperature.
Further, in the heating debugging mode, the first determining unit specifically includes:
the second calculating subunit is used for calculating the difference value between the outlet pipe temperature of each indoor unit and the liquid outlet temperature of the outdoor unit;
and a first determining subunit for determining an average length of the connecting pipe between the inner and outer units based on the difference and the outdoor ambient temperature.
Further, the second determining module specifically includes:
the first calculation unit is used for calculating an oil return priority judgment parameter based on the average length of the connecting pipe, the first correction coefficient and the second correction coefficient;
and the fourth determining unit is used for determining the corresponding oil return priority based on the oil return priority judging parameter.
Further, the control module specifically includes:
the fifth determining unit is used for determining the corresponding oil return period and the corresponding oil return duration based on the oil return priority;
and the control unit is used for controlling oil return of the multi-split air conditioning system based on the oil return period and the oil return duration.
In order to achieve the purpose, the invention further provides a multi-split system which comprises the oil return control device.
In order to achieve the above object, the present invention further provides a computer-readable storage medium, wherein the storage medium includes a stored program, and when the program runs, the apparatus on which the storage medium is located is controlled to execute the above oil return control method.
In order to achieve the above object, the present invention further provides a processor, where the processor is configured to execute a program, where the program executes the above oil return control method.
According to the technical scheme, compared with the prior art, the oil return control method, the oil return control device and the multi-split system are provided, different oil return priorities are comprehensively judged based on system operation parameters, different differentiated oil return schemes are provided for specific practical engineering, the oil return priorities are reasonably and reliably designed, accurate oil return is realized, oil return is ensured when a unit needs oil return, and the phenomenon that the unit is sufficient in oil quantity but frequent in oil return or the unit is short of oil but not in time in oil return is avoided.
Drawings
Fig. 1 is a flowchart of an oil return control method according to an embodiment of the present invention;
fig. 2 is a flowchart of another oil return control method according to an embodiment of the present invention;
fig. 3 is a flowchart for determining an average length of a connection pipe between an inner unit and an outer unit according to an embodiment of the present invention;
fig. 4 is a flowchart of another oil return control method according to an embodiment of the present invention;
fig. 5 is a flowchart for controlling an oil return operation of a multi-split air conditioning system based on an oil return priority according to an embodiment of the present invention;
fig. 6 is a block diagram of an oil return control device according to an embodiment of the present invention;
fig. 7 is a block diagram of a first determining module according to an embodiment of the present invention;
fig. 8 is a block diagram of a first determining unit according to an embodiment of the present invention;
fig. 9 is a block diagram of a second determining module according to an embodiment of the present invention;
fig. 10 is a block diagram of a control module according to an embodiment of the present invention;
fig. 11 is a method for determining an oil return priority according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 1, fig. 1 is a flowchart of an oil return control method provided in an embodiment of the present invention, where the method is applied to a multiple split air-conditioning system, and includes the following steps:
s10: determining the average length, a first correction coefficient and a second correction coefficient of a connecting pipe between the internal machine and the external machine according to the system operation parameters;
the system operation parameters can be parameters such as the pipe inlet temperature of the indoor unit, the pipe outlet temperature of the indoor unit, the ambient temperature, the number of the indoor units of the system, the capacity ratio of the indoor units and the outdoor units, and the like, and the average length of a connecting pipe between the indoor units and the outdoor units, a first correction coefficient and a second correction coefficient are determined according to the system operation parameters;
s20: determining corresponding oil return priority based on the average length of the connecting pipe, the first correction coefficient and the second correction coefficient;
the average length of the connecting pipe, the first correction coefficient and the second correction coefficient are determined according to system operation parameters, and then the oil return priority determined according to the average length of the connecting pipe, the first correction coefficient and the second correction coefficient can reflect the actual situation of a project, so that the determined oil return scheme is more reasonable and reliable.
S30: and controlling oil return operation of the multi-split air conditioning system based on the oil return priority.
The technical scheme provided by the embodiment of the invention comprehensively judges different oil return priorities based on the system operation parameters, provides different differentiated oil return schemes aiming at specific practical engineering, ensures that the design of the oil return priorities is reasonable and reliable, and realizes accurate oil return.
Example 2
Referring to fig. 2, fig. 2 is a flowchart of another oil return control method provided by an embodiment of the present invention, where the method is applied to a multi-split system, and includes the following steps:
s101: determining the average length of connecting pipes between the internal machine and the external machine according to system parameters;
the system parameters may be an indoor unit inlet pipe temperature, an indoor unit outlet pipe temperature, and the like, and refer to embodiment 3 specifically. The lengths of the respective connection pipes are determined based on different system parameters, and then an average value is calculated to obtain an average length L of the connection pipes.
S102: determining a first correction coefficient according to the number of the internal machines in the system;
in a specific implementation, the first correction parameters corresponding to the number of the internal machines may be preset, for example, please refer to table 1.
TABLE 1 first correction coefficient K value taking table
| Number of internal machines X | X＜c1 | c1≤X＜c2 | c2≤X＜c3 | c3≤X |
| Value of K | K1 | K2 | K3 | K4 |
C1, c2 and c3 in table 1 refer to different internal machine number thresholds, are constants, and c1 < c2 < c 3.
After the number X (unit) of the internal machines in the multi-split system is determined, the size of the first correction coefficient K can be determined according to table 1.
S103: determining a second correction coefficient according to the capacity ratio of the internal machine to the external machine; it should be noted that the capacity ratio of the indoor unit to the outdoor unit is a ratio of the total capacity of the indoor unit to the total capacity of the outdoor unit, and for a multi-split air-conditioning system, the total capacity of the indoor unit is generally greater than the rated capacity of the outdoor unit, and the capacity ratio of the indoor unit to the outdoor unit is generally not greater than 130%.
In a specific implementation, the second correction parameter M corresponding to the capacity ratio of the internal unit and the external unit may be preset, for example, please refer to table 2.
TABLE 2 second correction coefficient M value taking table
D1, d2 and d3 in table 2 refer to different internal and external machine capacity ratio thresholds, are constants, and are d1 < d2 < d 3.
Knowing the ratio of the capacity of the inner and outer units, the second correction parameter M can be determined according to table 2.
S20: determining corresponding oil return priority based on the average length of the connecting pipe, the first correction coefficient and the second correction coefficient;
the average length of the connecting pipe, the first correction coefficient and the second correction coefficient are determined according to system operation parameters, and then the oil return priority determined according to the average length of the connecting pipe, the first correction coefficient and the second correction coefficient can reflect the actual situation of a project, so that the determined oil return scheme is more reasonable and reliable.
S30: and controlling oil return operation of the multi-split air conditioning system based on the oil return priority.
It should be noted that, during the specific execution, the order of executing steps S101 to S103 is not limited, S101 may be executed first, and then S102 and S103 may be executed, S102 may be executed first, and then S101 and S103 may be executed, or S101 to S103 may be executed simultaneously, as long as all steps S101 to S103 are executed before step S20.
The technical scheme provided by the embodiment of the invention comprehensively judges different oil return priorities based on the parameters such as the average length L of the connecting pipes, the number of the internal machines in the system, the capacity ratio of the internal machines and the external machines and the like, ensures that the oil return priorities are reasonably and reliably designed, realizes accurate oil return, ensures that the oil return is carried out when the unit needs the oil return, and avoids the phenomenon that the unit is sufficient in oil quantity and is subjected to frequent oil return or the unit is short of oil but is not subjected to oil return in time.
Example 3
On the basis of the above embodiment 2, preferably, a specific method for obtaining the average length of the connecting pipe is further provided, referring to fig. 3, and fig. 3 shows a flow chart for determining the average length of the connecting pipe between the inner unit and the outer unit.
In the refrigeration debugging mode, all internal machines are fully opened, the lowest temperature and the ultrahigh gear operation can be set, and the step S101 specifically comprises:
s1011: calculating the difference value delta TPi between the inlet pipe temperature TJi of each indoor unit and the average low-pressure saturation temperature Tpd of the system;
the indoor unit inlet pipe temperature TJi can be detected by an indoor unit inlet pipe temperature sensing bulb on each indoor unit hydraulic pipe, and the unit is ℃. The Tpd is a system average low-voltage saturation temperature value, which may be a low-voltage average value of each outdoor unit, and if n outdoor units form a system, the low-voltage values of all the outdoor units are added to obtain an average low-voltage saturation temperature value Tpd, specifically, the low-voltage average value of each outdoor unit is detected by a low-voltage sensor arranged on the outdoor unit, so as to obtain the system average low-voltage saturation temperature Tpd.
S1012: and determining the average length of the connecting pipe between the inner machine and the outer machine based on the difference value delta TPi and the outdoor environment temperature T-env.
Wherein, the outdoor environment temperature can be detected by a temperature sensor, and the unit is ℃. When all the internal machines are fully turned on in the heating debugging mode, the highest temperature and ultrahigh gear operation can be set, and the step S101 specifically includes:
s1013: calculating the difference value delta TPi between the outlet pipe temperature TCi of each indoor unit and the liquid outlet temperature Tyci of the outdoor unit;
the indoor unit outlet pipe temperature TCi can be detected by an indoor unit outlet pipe temperature sensing bulb on an indoor unit air pipe, and the unit is ℃. The refrigerant temperature in the liquid pipe main pipe of the outdoor unit can be used as the outdoor unit liquid outlet temperature Tyci, and the unit is C.
S1012: the average length of the connection pipe between the inner and outer units is determined based on the difference and the outdoor ambient temperature T-env.
Wherein, the outdoor environment temperature can be detected by a temperature sensor, and the unit is ℃.
After determining the difference Δ TPi by the above method, the length of the connection pipe is obtained according to table 3, and the average length L of the connection pipe is obtained.
TABLE 3 Difference value Delta TPi estimation connecting pipe length value-taking table
A1, a2 and a3 in table 3 refer to different temperature difference thresholds, and are constants, and a1 < a2 < a 3.
The technical scheme provided by the embodiment of the invention can be used for judging the length of the connecting pipe of the system in a fuzzy manner according to the temperature parameter of the system, so that the average length estimation of the connecting pipe between the inner machine and the outer machine is more accurate, different oil return schemes are designed according to different engineering practical conditions, and the design of oil return priority is more reasonable and reliable and is closer to the reality.
Example 4
Referring to fig. 4, fig. 4 is a flowchart of another oil return control method provided by an embodiment of the present invention, where the method is applied to a multiple split air-conditioning system, and includes the following steps:
s101: determining the average length of connecting pipes between the internal machine and the external machine according to system parameters;
the system parameters may be an indoor unit inlet pipe temperature, an indoor unit outlet pipe temperature, and the like, and refer to embodiment 3 specifically. The lengths of the respective connection pipes are determined based on different system parameters, and then an average value is calculated to obtain an average length L of the connection pipes.
S102: determining a first correction coefficient according to the number of the internal machines in the system;
in a specific implementation, the first correction parameters corresponding to the number of the internal machines may be preset, for example, please refer to table 1.
After the number X (unit) of the internal machines in the multi-split system is determined, the size of the first correction coefficient K can be determined according to table 1.
S103: determining a second correction coefficient according to the capacity ratio of the internal machine to the external machine; it should be noted that the capacity ratio of the indoor unit to the outdoor unit is a ratio of the total capacity of the indoor unit to the total capacity of the outdoor unit, and for a multi-split air-conditioning system, the total capacity of the indoor unit is generally greater than the rated capacity of the outdoor unit, and the capacity ratio of the indoor unit to the outdoor unit is generally not greater than 130%.
In a specific implementation, the second correction parameter M corresponding to the capacity ratio of the internal unit and the external unit may be preset, for example, please refer to table 2. Knowing the ratio of the capacity of the inner and outer units, the second correction parameter M can be determined according to table 2.
In addition, it should be noted that, during specific execution, the sequential execution order of steps S101 to S103 is not limited, S101 may be executed first, and then S102 and S103 may be executed, S102 may be executed first, and then S101 and S103 may be executed, or S101 to S103 may be executed simultaneously, as long as before step S201, all steps S101 to S103 are executed completely.
S201: calculating an oil return priority judgment parameter based on the average length of the connecting pipe, the first correction coefficient and the second correction coefficient;
the oil return priority judging parameter Q is the product of the average connecting pipe length L, the first correction coefficient K and the second correction parameter M, that is, Q is L × K × M.
S202: determining corresponding oil return priority based on the oil return priority judgment parameter;
and looking up the table through the table 4 according to the oil return priority judgment parameter Q to obtain the corresponding oil return priority.
TABLE 4Q-value and priority of oil return correspondence table
E1, e2 and e3 in table 4 refer to different oil return priority judging parameter thresholds which are constants, and e1 < e2 < e 3.
S30: and controlling oil return operation of the multi-split air conditioning system based on the oil return priority.
Based on the technical scheme provided by the embodiment, the method can be used for solving the problems that: different oil return priority judging parameters are comprehensively determined according to parameters such as the average length L of the connecting pipes, the number of the internal machines in the system, the capacity ratio of the internal machines to the external machines and the like, corresponding oil return priorities are determined based on the oil return priority judging parameters, the oil return priorities are reasonably and reliably designed, accurate oil return is realized, oil return is ensured when the unit needs the oil return, and the phenomenon that the unit is full in oil but is frequently returned or the unit is short of oil but is not timely returned is avoided.
Example 5
Referring to fig. 5, on the basis of the foregoing embodiment 4, it is further preferable that step S30 specifically includes:
s301: determining a corresponding oil return period and oil return duration based on the oil return priority;
and after the corresponding oil return priority is determined according to the oil return priority judgment parameter Q, the oil return period and the oil return duration corresponding to the oil return priority are determined according to the table 5.
TABLE 5 oil return priority and oil return period, duration corresponding table
Wherein, the higher the oil return priority of tz1 & gttz 2 & gttz 3 & gttz 4 is, the smaller the oil return period is; ts1 < ts2 < ts3 < ts4, the higher the oil return priority, the smaller the oil return period.
S302: and controlling the oil return operation of the multi-split air conditioning system based on the oil return period and the oil return duration.
Aiming at systems with different oil return priorities, different oil return operation schemes are executed according to different oil return operation periods and different time lengths, and the optimal oil return scheme can be determined according to the actual engineering conditions.
Example 6
Corresponding to an oil return control method introduced in fig. 1, an embodiment of the present invention provides an oil return control device, as shown in fig. 6, fig. 6 is an oil return control device provided in an embodiment of the present invention, and the oil return control device is applied to a multi-split system, and the device includes:
the first determining module 10 is configured to determine an average length of a connecting pipe between the internal unit and the external unit, a first correction coefficient, and a second correction coefficient according to the system operation parameter;
the system operation parameters can be parameters such as the pipe inlet temperature of the indoor unit, the pipe outlet temperature of the indoor unit, the ambient temperature, the number of the indoor units of the system, the capacity ratio of the indoor units and the outdoor units, and the like, and the average length of a connecting pipe between the indoor units and the outdoor units, a first correction coefficient and a second correction coefficient are determined according to the system operation parameters;
a second determining module 20, configured to determine a corresponding oil return priority based on the average length of the connecting pipe, the first correction coefficient, and the second correction coefficient;
the average length of the connecting pipe, the first correction coefficient and the second correction coefficient are determined according to system operation parameters, and then the oil return priority determined according to the average length of the connecting pipe, the first correction coefficient and the second correction coefficient can reflect the actual situation of a project, so that the determined oil return scheme is more reasonable and reliable.
And the control module 30 is used for controlling oil return operation of the multi-split air conditioning system based on the oil return priority.
The technical scheme provided by the embodiment of the invention comprehensively judges different oil return priorities based on the system operation parameters, provides different differentiated oil return schemes aiming at specific practical engineering, ensures that the design of the oil return priorities is reasonable and reliable, and realizes accurate oil return.
Example 7
Referring to fig. 7, fig. 7 is a block diagram of a first determining module provided in an embodiment of the present invention, where the first determining module 10 specifically includes:
a first determining unit 101, configured to determine an average length of a connection pipe between the internal unit and the external unit according to a system temperature parameter;
the system parameters may be an indoor unit inlet pipe temperature, an indoor unit outlet pipe temperature, and the like, and refer to embodiment 8 specifically. The lengths of the respective connection pipes are determined based on different system parameters, and then an average value is calculated to obtain an average length L of the connection pipes.
A second determining unit 102, configured to determine a first correction factor according to the number of in-system machines;
in a specific implementation, the first correction parameters corresponding to the number of the internal machines may be preset, for example, please refer to table 1.
After the number X (unit) of the internal machines in the multi-split system is determined, the size of the first correction coefficient K can be determined according to table 1.
A third determining unit 103, configured to determine a second correction coefficient according to the internal/external machine capacity ratio.
It should be noted that the capacity ratio of the indoor unit to the outdoor unit is a ratio of the total capacity of the indoor unit to the total capacity of the outdoor unit, and for a multi-split air-conditioning system, the total capacity of the indoor unit is generally greater than the rated capacity of the outdoor unit, and the capacity ratio of the indoor unit to the outdoor unit is generally not greater than 130%.
In a specific implementation, the second correction parameter M corresponding to the capacity ratio of the internal unit and the external unit may be preset, for example, please refer to table 2. Knowing the ratio of the capacity of the inner and outer units, the second correction parameter M can be determined according to table 2.
It should be noted that, the sequence of calculating the average length L of the connecting pipe and determining the first correction coefficient K and the second correction parameter M is not limited, as long as the 3 parameters are determined before the second determining module 20 determines the oil return priority.
A second determining module 20, configured to determine a corresponding oil return priority based on the average length of the connecting pipe, the first correction coefficient, and the second correction coefficient;
the average length of the connecting pipe, the first correction coefficient and the second correction coefficient are determined according to system operation parameters, and the oil return priority determined based on the three parameters of the average length of the connecting pipe, the first correction coefficient and the second correction coefficient can reflect the actual conditions of a project, so that the determined oil return scheme is more reasonable and reliable.
And the control module 30 is used for controlling oil return operation of the multi-split air conditioning system based on the oil return priority.
The technical scheme provided by the embodiment of the invention comprehensively judges different oil return priorities based on the parameters such as the average length L of the connecting pipes, the number of the internal machines in the system, the capacity ratio of the internal machines and the external machines and the like, ensures that the oil return priorities are reasonably and reliably designed, realizes accurate oil return, ensures that the oil return is carried out when the unit needs the oil return, and avoids the phenomenon that the unit is sufficient in oil quantity and is subjected to frequent oil return or the unit is short of oil but is not subjected to oil return in time.
Example 8
On the basis of embodiment 7 above, preferably, in the refrigeration debugging mode, all the internal machines are fully turned on, the lowest temperature and the ultrahigh-level operation are set, and the first determining unit 101 specifically includes:
a first calculating subunit 1011, configured to calculate a difference Δ TPi between each indoor unit inlet pipe temperature TJi and the system average low-pressure saturation temperature Tpd;
the indoor unit inlet pipe temperature TJi can be detected by an indoor unit inlet pipe temperature sensing bulb on each indoor unit hydraulic pipe, and the unit is ℃. The Tpd is a system average low-voltage saturation temperature value, which may be a low-voltage average value of each outdoor unit, and if n outdoor units form a system, the low-voltage values of all the outdoor units are added to obtain an average low-voltage saturation temperature value Tpd, specifically, the low-voltage average value of each outdoor unit is detected by a low-voltage sensor arranged on the outdoor unit, so as to obtain the system average low-voltage saturation temperature Tpd.
A first determining subunit 1012, configured to determine the lengths of the connection pipes between the internal machine and the external machine based on the difference Δ TPi and the outdoor ambient temperature T-env.
When in the heating debugging mode, all the internal machines are fully opened, the highest temperature and ultrahigh-level operation can be set, and the first determining module 1 specifically comprises:
a second calculating subunit 1013, configured to calculate a difference Δ TPi between each indoor unit outlet pipe temperature TCi and the outdoor unit liquid outlet temperature Tyci;
the indoor unit outlet pipe temperature TCi can be detected by an indoor unit outlet pipe temperature sensing bulb on an indoor unit air pipe, and the unit is ℃. The refrigerant temperature in the liquid pipe main pipe of the outdoor unit can be used as the outdoor unit liquid outlet temperature Tyci, and the unit is C.
A first determination unit 1012 for determining an average length of the connection pipe between the inner and outer units based on the difference and the outdoor ambient temperature.
Wherein, the outdoor environment temperature can be detected by a temperature sensor, and the unit is ℃.
After determining the difference Δ TPi, the average length L of the connection pipes is obtained according to table 3.
The technical scheme provided by the embodiment of the invention can be used for judging the length of the connecting pipe of the system in a fuzzy manner according to the temperature parameter of the system, so that the average length estimation of the connecting pipe between the inner machine and the outer machine is more accurate, different oil return schemes are designed according to different engineering practical conditions, and the design of oil return priority is more reasonable and reliable and is closer to the reality.
Example 9
Referring to fig. 9, fig. 9 is a schematic diagram of a second determining module according to an embodiment of the present invention, where the second determining module 20 specifically includes:
a first calculation unit 201, configured to calculate an oil return priority determination parameter based on the average length of the connection pipe, the first correction coefficient, and the second correction coefficient;
specifically, the oil return priority determination parameter Q is a product of the average connecting pipe length L, the first correction coefficient K, and the second correction parameter M, that is, Q is L × K × M.
A fourth determining unit 202, configured to determine a corresponding oil return priority based on the oil return priority determination parameter.
After the oil return priority judging parameter Q is obtained, the corresponding oil return priority can be obtained by looking up the table in table 4.
According to the technical scheme provided by the embodiment of the invention, the oil return priority judgment parameter is comprehensively determined based on the parameters such as the average length L of the connecting pipe, the first correction coefficient K and the second correction parameter M, so that the oil return priority is determined, the reasonable and reliable design of the oil return priority is ensured, and the accurate oil return is realized.
Example 10
Referring to fig. 10, fig. 10 is a schematic diagram of a control module according to an embodiment of the present invention, where the control module specifically includes:
a fifth determining unit 301, configured to determine a corresponding oil return period and oil return duration based on the oil return priority;
and after the corresponding oil return priority is determined according to the oil return priority judgment parameter Q, the oil return period and the oil return duration corresponding to the oil return priority are determined according to the table 5.
Wherein, the higher the oil return priority of tz1 & gttz 2 & gttz 3 & gttz 4 is, the smaller the oil return period is; ts1 < ts2 < ts3 < ts4, the higher the oil return priority, the smaller the oil return period.
And a control unit 302 for controlling oil return operation of the multi-split air conditioning system based on the oil return period and the oil return duration.
Aiming at systems with different oil return priorities, different oil return operation schemes are executed according to different oil return operation periods and different time lengths, and the optimal oil return scheme can be determined according to the actual engineering conditions.
In addition, the embodiment of the invention also discloses a multi-split system which comprises the oil return control device.
The oil return control device is applied to the multi-split system, oil return schemes can be matched according to the actual conditions of the multi-split system, and the optimal oil return scheme is judged according to the operation parameters for a user to select.
With reference to fig. 11, fig. 11 is a flowchart of an oil return priority determining method according to an embodiment of the present invention, where a unit enters a debugging mode, and starts an oil return priority determining program, at this time, a length of a connection pipe is first calculated: the difference Δ TPi is determined from the operating parameters and the average length L of the connection pipe is then obtained according to table 3.
The unit determines a first correction coefficient K value according to the number of the internal units and determines a second correction coefficient M value according to the capacity ratio of the internal units and the external units.
And after L, K and M values are obtained, the unit calculates the size of the oil return priority judgment parameter Q according to a built-in program.
And (4) according to the size of the oil return priority judgment parameter Q value, the unit determines the oil return priority HY matched with the unit through the table 4.
The unit saves the oil return priority and exits the confirmation program. And the subsequent unit executes oil return according to the oil return priority control scheme.
According to the technical scheme provided by the embodiment of the invention, the average length of the connecting pipes, the number of the internal machines and the capacity ratio of the internal machines and the external machines are combined, the oil return priority is comprehensively judged, and the reasonable and reliable design of the oil return priority is ensured to be close to the actual condition; aiming at systems with different oil return priorities, different oil return operation schemes are executed, the oil return operation periods and the oil return operation time lengths are different, the optimal oil return scheme can be provided, the unit oil return is closely matched with the engineering practice, accurate oil return is achieved, energy is saved and the oil return is reliable compared with the traditional oil return scheme, and the oil return is really achieved according to needs.
In order to solve the problems in the prior art, an embodiment of the present invention further discloses a computer-readable storage medium, where the storage medium includes a stored program, and when the program runs, the apparatus where the storage medium is located is controlled to execute the above-mentioned oil return control method.
The storage medium stores the software, and the storage medium includes but is not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
In addition, the embodiment of the invention also discloses a processor, wherein the processor is used for running the program, and the oil return control method is executed when the program runs.
The oil return priority design scheme provided by the embodiment of the invention closely matches the unit oil return with the engineering practice, realizes accurate oil return, is more energy-saving and reliable than the traditional oil return scheme, realizes oil return according to needs, and avoids the phenomenon that the unit oil is sufficient but the oil is returned frequently or the unit is short of the oil but the oil is not returned timely.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An oil return control method is applied to a multi-split air conditioning system, and comprises the following steps:
determining the average length, a first correction coefficient and a second correction coefficient of a connecting pipe between the internal machine and the external machine according to the system operation parameters;
determining corresponding oil return priority based on the average length of the connecting pipe, the first correction coefficient and the second correction coefficient;
controlling oil return operation of the multi-split air conditioning system based on the oil return priority; which comprises the following steps: determining a corresponding oil return period and oil return duration based on the oil return priority; controlling oil return operation of the multi-split air conditioning system based on an oil return period and an oil return duration;
the system operating parameters include: system temperature parameters, the number of internal machines in the system and the capacity ratio of the internal machines to the external machines; the determining the average length of the connecting pipes between the inner machine and the outer machine, the first correction coefficient and the second correction coefficient according to the system operation parameters specifically comprises:
determining the average length of connecting pipes between the internal machine and the external machine according to the system temperature parameters;
determining a first correction coefficient according to the number of the internal machines in the system;
determining a second correction coefficient according to the capacity ratio of the internal machine to the external machine;
the determining the corresponding oil return priority based on the average length of the connecting pipe, the first correction coefficient and the second correction coefficient specifically includes:
calculating an oil return priority judgment parameter based on the average length of the connecting pipe, the first correction coefficient and the second correction coefficient;
and determining the corresponding oil return priority based on the oil return priority judgment parameter.
2. The method of claim 1, wherein the determining an average length of the connection pipe between the indoor unit and the outdoor unit according to the system temperature parameter when in the cooling commissioning mode specifically comprises:
calculating the difference between the inlet pipe temperature of each indoor unit and the average low-pressure saturation temperature of the system;
the average length of the connection pipe between the inner and outer units is determined based on the difference and the outdoor ambient temperature.
3. The method of claim 2, wherein the determining the average length of the connection pipe between the inner unit and the outer unit according to the system temperature parameter in the heating commissioning mode specifically comprises:
calculating the difference between the outlet pipe temperature of each indoor unit and the liquid outlet temperature of the outdoor unit;
the average length of the connection pipe between the inner and outer units is determined based on the difference and the outdoor ambient temperature.
4. An oil return control device is characterized in that the oil return control device is applied to a multi-split air conditioning system, and the device comprises:
the first determining module is used for determining the average length of connecting pipes between the inner machine and the outer machine, a first correction coefficient and a second correction coefficient according to the system operation parameters;
the second determining module is used for determining corresponding oil return priority based on the average length of the connecting pipe, the first correction coefficient and the second correction coefficient;
the control module is used for controlling oil return operation of the multi-split air conditioning system based on the oil return priority;
the first determining module specifically includes:
the first determining unit is used for determining the average length of connecting pipes between the inner machine and the outer machine according to the system temperature parameters;
the second determining unit is used for determining a first correction coefficient according to the number of the internal machines in the system;
a third determining unit, configured to determine a second correction coefficient according to the capacity ratio of the internal machine to the external machine;
the second determining module specifically includes:
the first calculation unit is used for calculating an oil return priority judgment parameter based on the average length of the connecting pipe, the first correction coefficient and the second correction coefficient;
the fourth determining unit is used for determining the corresponding oil return priority based on the oil return priority judging parameter;
the control module specifically comprises: the fifth determining unit is used for determining the corresponding oil return period and the corresponding oil return duration based on the oil return priority; and the control unit is used for controlling oil return of the multi-split air conditioning system based on the oil return period and the oil return duration.
5. The apparatus according to claim 4, wherein in the refrigeration debugging mode, the first determining unit specifically includes:
the first calculating subunit is used for calculating the difference value between the inlet pipe temperature of each indoor unit and the average low-pressure saturation temperature of the system;
and a first determining subunit for determining an average length of the connecting pipe between the inner and outer units based on the difference and the outdoor ambient temperature.
6. The apparatus according to claim 5, wherein in the heating debugging mode, the first determining unit specifically includes:
the second calculating subunit is used for calculating the difference value between the outlet pipe temperature of each indoor unit and the liquid outlet temperature of the outdoor unit;
and a first determining subunit for determining an average length of the connecting pipe between the inner and outer units based on the difference and the outdoor ambient temperature.
7. A multi-split system, characterized by comprising an oil return control device as claimed in any one of claims 4 to 6.
8. A computer-readable storage medium, wherein the storage medium includes a stored program, and when the program runs, the apparatus on which the storage medium is located is controlled to execute an oil return control method according to any one of claims 1 to 3.
9. A processor, characterized in that the processor is configured to run a program, wherein the program executes an oil return control method according to any one of claims 1 to 3 when running.
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| CN202011345346.7A CN112361538B (en) | 2020-11-25 | 2020-11-25 | Oil return control method and device and multi-split system |
| PCT/CN2021/127898 WO2022111224A1 (en) | 2020-11-25 | 2021-11-01 | Oil return control method and apparatus and multi-split air conditioner |
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| CN202011345346.7A CN112361538B (en) | 2020-11-25 | 2020-11-25 | Oil return control method and device and multi-split system |
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| 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 |
| CN113108445B (en) * | 2021-04-26 | 2023-04-21 | 广东美的暖通设备有限公司 | Oil return control method and device for multi-split air conditioning system |
| CN114135973B (en) * | 2021-11-15 | 2023-02-03 | 珠海格力电器股份有限公司 | Multi-split air conditioner control method and device and multi-split air conditioner |
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