CN108548297B - Multi-split air conditioner and method for controlling refrigerants of multi-split air conditioner - Google Patents
Multi-split air conditioner and method for controlling refrigerants of multi-split air conditioner Download PDFInfo
- Publication number
- CN108548297B CN108548297B CN201810397382.4A CN201810397382A CN108548297B CN 108548297 B CN108548297 B CN 108548297B CN 201810397382 A CN201810397382 A CN 201810397382A CN 108548297 B CN108548297 B CN 108548297B
- Authority
- CN
- China
- Prior art keywords
- target
- indoor unit
- expansion valve
- electronic expansion
- indoor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- F24F11/67—Switching between heating and cooling modes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
-
- 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 provides a multi-split air conditioner and a method for controlling refrigerants of the multi-split air conditioner, which comprises the following steps: s1: collecting operation information of each indoor unit in the multi-split air conditioner, wherein the operation information comprises at least two indoor coil temperature values, each indoor coil temperature value corresponds to a collection time, and the time difference between the collection time and the current time is within a preset time threshold; s2: judging whether at least one target indoor unit exists in each indoor unit according to the temperature values of at least two indoor coils of each indoor unit, wherein the target indoor unit has refrigerant accumulation, if so, executing S3, otherwise, executing S1; s3: determining the opening degree of a target electronic expansion valve of each target indoor unit; s4: and adjusting the electronic expansion valve corresponding to each target indoor unit according to the target opening degree of the electronic expansion valve of each target indoor unit to control the refrigerant conveyed to each target indoor unit by the outdoor unit, and executing S1. The scheme is simple to operate and high in timeliness.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-split air conditioner and a method for controlling refrigerants of the multi-split air conditioner.
Background
The outdoor unit of a multi-split air conditioner is shared with the refrigerant of each indoor unit, and the distribution of the refrigerant is generally adjusted by controlling the opening degree of an electronic expansion valve of the indoor unit during operation. However, the opening degree of the electronic expansion valve of each indoor unit is different, and therefore, the refrigerant in the indoor unit is often accumulated. In order to ensure the normal operation of the multi-split air conditioner, the refrigerant in the multi-split air conditioner needs to be controlled in time.
In the prior art, after the refrigerant accumulation in the multi-split air conditioner is detected, the multi-split air conditioner generally needs to be shut down to adjust the opening of the electronic expansion valve.
However, the method is complicated in operation process and poor in timeliness.
Disclosure of Invention
The embodiment of the invention provides a multi-split air conditioner and a method for controlling refrigerants of the multi-split air conditioner, which can control the refrigerants of the multi-split air conditioner by adjusting the opening degree of an electronic expansion valve in the operation process of the multi-split air conditioner.
In a first aspect, an embodiment of the present invention provides a method for controlling refrigerants of a multi-split air conditioner, which is applied to a refrigerant controller, and includes:
s1: collecting operation information of each indoor unit in the multi-split air conditioner, wherein the operation information comprises at least two indoor coil temperature values, each indoor coil temperature value corresponds to a collection time, and the time difference between the collection time and the current time is within a preset time threshold;
s2: judging whether at least one target indoor unit exists in each indoor unit according to the temperature values of the at least two indoor coils of each indoor unit, wherein the target indoor unit has refrigerant accumulation, if so, executing S3, otherwise, executing S1;
s3: determining the opening degree of a target electronic expansion valve of each target indoor unit;
s4: and adjusting the electronic expansion valve corresponding to each target indoor unit according to the target electronic expansion valve opening degree of each target indoor unit to control the refrigerant conveyed to each target indoor unit by the outdoor unit, and executing S1.
Preferably, the first and second electrodes are formed of a metal,
further comprising: presetting an ascending temperature threshold and a descending temperature threshold;
according to at least two indoor coil pipe temperature values of each indoor unit, whether at least one target indoor unit exists in each indoor unit is judged, wherein refrigerant accumulation exists in the target indoor unit, and the method comprises the following steps:
for each of the indoor units, performing: determining the variation trend of the indoor coil temperature according to at least two indoor coil temperature values of the current indoor unit;
when the variation trend of the indoor coil temperature is rising, judging whether the largest indoor coil temperature value in the at least two indoor coil temperature values is smaller than the rising temperature threshold value, if so, determining that the current indoor unit has refrigerant accumulation and is the target indoor unit;
and when the change trend of the indoor coil temperature is descending, judging whether the minimum indoor coil temperature value in the at least two indoor coil temperature values is smaller than the descending temperature threshold value, and if so, determining that the current indoor unit has refrigerant accumulation and is the target indoor unit.
Preferably, the first and second electrodes are formed of a metal,
further comprising:
dividing a temperature range which is not higher than the rising temperature threshold into at least two rising temperature intervals, and setting a first electronic expansion valve opening degree for each rising temperature interval;
dividing a temperature range which is not higher than the falling temperature threshold into at least two falling temperature intervals, and setting a second electronic expansion valve opening degree for each falling temperature interval;
the S3, including:
for each target indoor unit, executing:
when the change trend of the indoor coil temperature is rising, determining a target rising temperature interval, wherein the target rising temperature interval is a rising temperature interval in which the largest indoor coil temperature value in the at least two indoor coil temperature values is located;
taking the opening degree of a first electronic expansion valve corresponding to the target temperature rise interval as the opening degree of a target electronic expansion valve of the current target indoor unit;
when the variation trend of the indoor coil temperature is descending, determining a target descending temperature interval, wherein the target descending temperature interval is the descending temperature interval in which the minimum indoor coil temperature value in the at least two indoor coil temperature values is located;
and taking the opening degree of the second electronic expansion valve corresponding to the target temperature drop interval as the target opening degree of the electronic expansion valve of the current target indoor unit.
Preferably, the first and second electrodes are formed of a metal,
the operation information further includes: current electronic expansion valve opening;
the adjusting, according to the target electronic expansion valve opening degree of each target indoor unit, the electronic expansion valve corresponding to each target indoor unit to control the refrigerant conveyed by the outdoor unit to each target indoor unit includes:
determining the adjustment amplitude of the electronic expansion valve of each target indoor unit according to the target electronic expansion valve opening and the current electronic expansion valve opening of each target indoor unit;
and adjusting the electronic expansion valve corresponding to each target indoor unit according to the electronic expansion valve adjustment amplitude of each target indoor unit so as to control the refrigerant conveyed to each target indoor unit by the outdoor unit.
Preferably, the first and second electrodes are formed of a metal,
the operation information further includes: an operating mode;
after S1, before S2, further comprising:
determining the operation mode of the multi-split air conditioner according to the operation mode of each indoor unit;
when the operation mode of the multi-split air conditioner is cooling, S1 is performed, and when the operation mode of the multi-split air conditioner is heating, S2 is performed.
In a second aspect, an embodiment of the present invention provides a multi-split air conditioner, including: the system comprises a refrigerant controller, an outdoor unit, at least two indoor units and an electronic expansion valve corresponding to each indoor unit; the outdoor unit is connected with each indoor unit through the corresponding electronic expansion valve;
the refrigerant controller is used for executing:
s1: collecting operation information of each indoor unit, wherein the operation information comprises at least two indoor coil temperature values, each indoor coil temperature value corresponds to a collection time, and the time difference between the collection time and the current time is within a preset time threshold;
s2: judging whether at least one target indoor unit exists in each indoor unit according to the temperature values of the at least two indoor coils of each indoor unit, wherein the target indoor unit has refrigerant accumulation, if so, executing S3, otherwise, executing S1;
s3: determining the opening degree of a target electronic expansion valve of each target indoor unit;
s4: and adjusting the electronic expansion valve corresponding to each target indoor unit according to the target electronic expansion valve opening degree of each target indoor unit to control the refrigerant conveyed to each target indoor unit by the outdoor unit, and executing S1.
Preferably, the first and second electrodes are formed of a metal,
the refrigerant controller is further used for setting an ascending temperature threshold and a descending temperature threshold;
the refrigerant controller is configured to, for each of the indoor units, perform: determining the variation trend of the indoor coil temperature according to at least two indoor coil temperature values of the current indoor unit; when the variation trend of the indoor coil temperature is rising, judging whether the largest indoor coil temperature value in the at least two indoor coil temperature values is smaller than the rising temperature threshold value, if so, determining that the current indoor unit has refrigerant accumulation and is the target indoor unit; and when the change trend of the indoor coil temperature is descending, judging whether the minimum indoor coil temperature value in the at least two indoor coil temperature values is smaller than the descending temperature threshold value, and if so, determining that the current indoor unit has refrigerant accumulation and is the target indoor unit.
Preferably, the first and second electrodes are formed of a metal,
the refrigerant controller is further used for dividing a temperature range not higher than the rising temperature threshold into at least two rising temperature intervals, and setting a first electronic expansion valve opening degree for each rising temperature interval; dividing a temperature range which is not higher than the falling temperature threshold into at least two falling temperature intervals, and setting a second electronic expansion valve opening degree for each falling temperature interval;
the refrigerant controller is configured to, for each target indoor unit, execute:
when the change trend of the indoor coil temperature is rising, determining a target rising temperature interval, wherein the target rising temperature interval is a rising temperature interval in which the largest indoor coil temperature value in the at least two indoor coil temperature values is located; taking the opening degree of a first electronic expansion valve corresponding to the target temperature rise interval as the opening degree of a target electronic expansion valve of the current target indoor unit;
when the variation trend of the indoor coil temperature is descending, determining a target descending temperature interval, wherein the target descending temperature interval is the descending temperature interval in which the minimum indoor coil temperature value in the at least two indoor coil temperature values is located; and taking the opening degree of the second electronic expansion valve corresponding to the target temperature drop interval as the target opening degree of the electronic expansion valve of the current target indoor unit.
Preferably, the first and second electrodes are formed of a metal,
the operation information further includes: current electronic expansion valve opening;
the refrigerant controller is used for determining the adjustment amplitude of the electronic expansion valve of each target indoor unit according to the target electronic expansion valve opening and the current electronic expansion valve opening of each target indoor unit; and adjusting the electronic expansion valve corresponding to each target indoor unit according to the electronic expansion valve adjustment amplitude of each target indoor unit so as to control the refrigerant conveyed to each target indoor unit by the outdoor unit.
Preferably, the first and second electrodes are formed of a metal,
the operation information further includes: an operating mode;
the refrigerant controller is further used for determining the operation mode of the multi-split air conditioner according to the operation mode of each indoor unit; when the operation mode of the multi-split air conditioner is cooling, S1 is performed, and when the operation mode of the multi-split air conditioner is heating, S2 is performed.
The embodiment of the invention provides a multi-split air conditioner and a method for controlling refrigerants of the multi-split air conditioner. The method can realize closed-loop control of the refrigerant in the multi-split air conditioner by adjusting the opening of the electronic expansion valve in the operation process of the multi-split air conditioner, and is simple to operate and high in timeliness.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart illustrating a method of controlling refrigerants of a multi-split air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a multi-split air conditioner according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for controlling refrigerants of a multi-split air conditioner according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a method for controlling refrigerants of a multi-split air conditioner, which is applied to a refrigerant controller, and the method may include the following steps:
step 101: collecting operation information of each indoor unit in the multi-split air conditioner, wherein the operation information comprises at least two indoor coil temperature values, each indoor coil temperature value corresponds to a collection time, and the time difference between the collection time and the current time is within a preset time threshold;
step 102: judging whether at least one target indoor unit exists in each indoor unit according to the temperature values of at least two indoor coils of each indoor unit, wherein the target indoor unit has refrigerant accumulation, if so, executing a step 103, otherwise, executing a step 101;
step 103: determining the opening degree of a target electronic expansion valve of each target indoor unit;
step 104: and adjusting the electronic expansion valve corresponding to each target indoor unit according to the opening degree of the target electronic expansion valve of each target indoor unit to control the refrigerant conveyed to each target indoor unit by the outdoor unit, and executing the step 101.
The refrigerant controller can collect indoor coil temperature values of the indoor units at different moments in real time in the operation process of the multi-split air conditioner, judge whether refrigerant accumulation exists in the indoor units or not according to the indoor coil temperature values, and control the electronic expansion valve between the target indoor unit and the outdoor unit to control the refrigerant conveyed to the target indoor unit by the outdoor unit when the refrigerant accumulation exists in the target indoor unit. The method can realize closed-loop control of the refrigerant in the multi-split air conditioner by adjusting the opening of the electronic expansion valve in the operation process of the multi-split air conditioner, and is simple to operate and high in timeliness.
In one embodiment of the invention, the method further comprises: presetting an ascending temperature threshold and a descending temperature threshold;
according to at least two indoor coil pipe temperature values of each indoor set, whether at least one target indoor set exists in each indoor set is judged, wherein, there is refrigerant pile up in the target indoor set, including:
for each indoor unit, executing: determining the variation trend of the indoor coil temperature according to at least two indoor coil temperature values of the current indoor unit;
when the change trend of the indoor coil temperature is rising, judging whether the largest indoor coil temperature value in at least two indoor coil temperature values is smaller than a rising temperature threshold value, if so, determining that the current indoor unit has refrigerant accumulation and is a target indoor unit;
when the change trend of the indoor coil temperature is descending, judging whether the minimum indoor coil temperature value in at least two indoor coil temperature values is smaller than a descending temperature threshold value, if so, determining that the current indoor unit has refrigerant accumulation and is a target indoor unit.
In the embodiment of the invention, in order to more clearly determine the normal state and the refrigerant lack state, the rising temperature threshold and the falling temperature threshold with different sizes are respectively set aiming at the temperature rising condition and the temperature falling condition so as to accurately determine the occurrence of refrigerant accumulation. For example, the set rising temperature threshold and the set falling temperature threshold are respectively 30 ℃ and 25 ℃, and when the collected indoor coil temperature values are 32 ℃, 28 ℃ and 24 ℃ in sequence, the minimum value 24 ℃ in the three indoor coil temperature values is less than the falling temperature threshold 25 ℃, so that the refrigerant accumulation of the indoor unit is determined.
In one embodiment of the present invention, to determine the adjustment amplitude of the electronic expansion valve based on the indoor coil temperature, the method further comprises:
dividing a temperature range which is not higher than a rising temperature threshold into at least two rising temperature intervals, and setting a first electronic expansion valve opening degree for each rising temperature interval;
dividing a temperature range which is not higher than a drop temperature threshold into at least two drop temperature intervals, and setting a second electronic expansion valve opening degree for each drop temperature interval;
s3, including:
for each target indoor unit, executing:
when the change trend of the indoor coil temperature is rising, determining a target rising temperature interval, wherein the target rising temperature interval is a rising temperature interval in which the largest indoor coil temperature value in at least two indoor coil temperature values is located;
taking the opening degree of a first electronic expansion valve corresponding to the target temperature rise interval as the opening degree of a target electronic expansion valve of the current target indoor unit;
when the variation trend of the indoor coil temperature is descending, determining a target descending temperature interval, wherein the target descending temperature interval is the descending temperature interval in which the minimum indoor coil temperature value in the at least two indoor coil temperature values is located;
and taking the second electronic expansion valve opening corresponding to the target temperature drop interval as the target electronic expansion valve opening of the current target indoor unit.
In the embodiment of the invention, the opening degree of the electronic expansion valve can be adjusted according to the accumulation degree of the refrigerant, and the accumulation degree of the refrigerant can be determined by the temperature value of the indoor coil pipe.
In one embodiment of the present invention, the operation information further includes: current electronic expansion valve opening;
according to the target electronic expansion valve opening degree of each target indoor unit, adjusting the electronic expansion valve corresponding to each target indoor unit so as to control the refrigerant conveyed to each target indoor unit by the outdoor unit, wherein the method comprises the following steps:
determining the adjustment amplitude of the electronic expansion valve of each target indoor unit according to the target electronic expansion valve opening and the current electronic expansion valve opening of each target indoor unit;
and adjusting the amplitude according to the electronic expansion valve of each target indoor unit, and adjusting the electronic expansion valve corresponding to each target indoor unit so as to control the refrigerant conveyed to each target indoor unit by the outdoor unit.
In an embodiment of the present invention, in order to further simplify the process of determining the refrigerant accumulation, the operation information further includes: an operating mode;
after S1, before S2, further comprising:
determining the operation mode of the multi-split air conditioner according to the operation mode of each indoor unit;
when the operation mode of the multi-airconditioner is cooling, S1 is performed, and when the operation mode of the multi-airconditioner is heating, S2 is performed.
Since the refrigerant accumulation occurs in the heating mode, when the multi-split air conditioner does not have the refrigerant accumulation in the cooling mode, the subsequent calculation amount can be simplified through the step, and the control efficiency is improved.
As shown in fig. 2, an embodiment of the present invention provides a multi-split air conditioner, including: a refrigerant controller 201, an outdoor unit 202, two indoor units 203 and an electronic expansion valve 204 corresponding to each indoor unit; the outdoor unit 202 is connected with each indoor unit 203 through a corresponding electronic expansion valve 204;
a refrigerant controller 201 for executing:
s1: collecting operation information of each indoor unit 203, wherein the operation information comprises at least two indoor coil temperature values, each indoor coil temperature value corresponds to a collection time, and the time difference between the collection time and the current time is within a preset time threshold;
s2: judging whether at least one target indoor unit exists in each indoor unit 203 according to the at least two indoor coil temperature values of each indoor unit 203, wherein the target indoor unit has refrigerant accumulation, if so, executing S3, otherwise, executing S1;
s3: determining the opening degree of a target electronic expansion valve of each target indoor unit;
s4: the electronic expansion valve corresponding to each target indoor unit is adjusted according to the target electronic expansion valve opening degree of each target indoor unit to control the refrigerant sent to each target indoor unit by the outdoor unit 202, and S1 is executed.
In an embodiment of the present invention, the refrigerant controller 201 is further configured to set an increasing temperature threshold and a decreasing temperature threshold;
a refrigerant controller 201 configured to, for each indoor unit 203: determining the variation trend of the indoor coil temperature according to at least two indoor coil temperature values of the current indoor unit; when the change trend of the indoor coil temperature is rising, judging whether the largest indoor coil temperature value in at least two indoor coil temperature values is smaller than a rising temperature threshold value, if so, determining that the current indoor unit has refrigerant accumulation and is a target indoor unit; when the change trend of the indoor coil temperature is descending, judging whether the minimum indoor coil temperature value in at least two indoor coil temperature values is smaller than a descending temperature threshold value, if so, determining that the current indoor unit has refrigerant accumulation and is a target indoor unit.
In an embodiment of the present invention, the refrigerant controller 201 is further configured to divide a temperature range not higher than the rising temperature threshold into at least two rising temperature intervals, and set an opening degree of the first electronic expansion valve for each rising temperature interval; dividing a temperature range which is not higher than a drop temperature threshold into at least two drop temperature intervals, and setting a second electronic expansion valve opening degree for each drop temperature interval;
a refrigerant controller 201, configured to, for each target indoor unit, perform:
when the change trend of the indoor coil temperature is rising, determining a target rising temperature interval, wherein the target rising temperature interval is a rising temperature interval in which the largest indoor coil temperature value in at least two indoor coil temperature values is located; taking the opening degree of a first electronic expansion valve corresponding to the target temperature rise interval as the opening degree of a target electronic expansion valve of the current target indoor unit;
when the variation trend of the indoor coil temperature is descending, determining a target descending temperature interval, wherein the target descending temperature interval is the descending temperature interval in which the minimum indoor coil temperature value in the at least two indoor coil temperature values is located; and taking the second electronic expansion valve opening corresponding to the target temperature drop interval as the target electronic expansion valve opening of the current target indoor unit.
In one embodiment of the present invention, the operation information further includes: current electronic expansion valve opening;
the refrigerant controller 201 is configured to determine an adjustment amplitude of the electronic expansion valve of each target indoor unit according to the target electronic expansion valve opening and the current electronic expansion valve opening of each target indoor unit; and adjusting the amplitude according to the electronic expansion valve of each target indoor unit, and adjusting the electronic expansion valve corresponding to each target indoor unit so as to control the refrigerant conveyed to each target indoor unit by the outdoor unit.
In one embodiment of the present invention, the operation information further includes: an operating mode;
the refrigerant controller 201 is further configured to determine an operation mode of the multi-split air conditioner according to the operation mode of each indoor unit 203; when the operation mode of the multi-airconditioner is cooling, S1 is performed, and when the operation mode of the multi-airconditioner is heating, S2 is performed.
As shown in fig. 3, the embodiment of the present invention takes a two-split air conditioner as an example to describe in detail a method for controlling refrigerants of a multi-split air conditioner, which may include the following steps:
step 301: an increasing temperature threshold and a decreasing temperature threshold are set.
The rising temperature threshold is 30 ℃ and the falling temperature threshold is 25 ℃.
Step 302: the temperature range not higher than the rising temperature threshold is divided into at least two rising temperature intervals, a first electronic expansion valve opening degree is set for each rising temperature interval, the temperature range not higher than the falling temperature threshold is divided into at least two falling temperature intervals, and a second electronic expansion valve opening degree is set for each falling temperature interval.
Dividing the temperature range not higher than the rising temperature threshold into 30-25 ℃, 24-20 ℃ and less than 20 ℃, wherein the opening degrees of the first electronic expansion valves are A1, A2 and A3 respectively;
the temperature range not higher than the temperature drop threshold is divided into 25-20 ℃, 19-15 ℃ and less than 15 ℃, and the opening degrees of the first electronic expansion valves are respectively B1, B2 and B3.
It should be noted that, in an actual application scenario, a refrigerant state, such as a normal refrigerant lack state, a medium refrigerant lack state, a severe refrigerant lack state, etc., may also be set for each temperature interval, so that the operation state of the air conditioner may be determined more intuitively.
Step 303: the method comprises the steps of collecting operation information of each indoor unit in the multi-split air conditioner, wherein the operation information comprises the opening degree of a current electronic expansion valve, an operation mode and three indoor coil temperature values, each indoor coil temperature value corresponds to a collection moment, and the time difference between the collection moment and the current moment is within a preset time threshold.
In the embodiment of the invention, the time threshold is 5s, and the indoor coil temperature values are respectively collected 2s, 1s before the current moment and the current moment.
The current opening degree of an electronic expansion valve of the indoor unit M is M1, the operation mode is heating, and the temperature values of the three indoor coil pipes are 26 ℃, 29 ℃ and 31 ℃ in sequence;
the opening degree of the current electronic expansion valve of the indoor unit N is N1, the operation mode is heating, and the temperature values of the three indoor coils are 29 ℃, 26 ℃ and 24 ℃ in sequence.
Step 304: and determining the operation mode of the multi-split air conditioner according to the operation mode of each indoor unit, executing the step 303 when the operation mode of the multi-split air conditioner is cooling, and executing the step 305 when the operation mode of the multi-split air conditioner is heating.
As can be seen from the operation mode of the indoor unit M, N, the operation mode of the multi-airconditioner is heating, and step 305 is executed.
Step 305: for each indoor unit, executing: and determining the variation trend of the indoor coil temperature according to the three indoor coil temperature values of the current indoor unit.
Taking the indoor unit M as an example, the three indoor coil temperature values are 26 ℃, 29 ℃ and 31 ℃ in this order, and therefore the indoor coil temperature tends to increase.
Step 306: when the variation trend of the indoor coil temperature is rising, whether the maximum indoor coil temperature value in the three indoor coil temperature values is smaller than a rising temperature threshold value is judged, if yes, step 307 is executed, and if not, step 303 is executed.
The largest indoor coil temperature value among the three indoor coil temperature values is 31 ℃, which is greater than the rising temperature threshold value of 30 ℃, so that no refrigerant is accumulated in the current indoor unit M, and the step 303 is executed to continue the collection.
Step 307: and determining that the current indoor unit has refrigerant accumulation and is the target indoor unit, and executing step 310.
Step 308: and when the variation trend of the indoor coil temperature is descending, judging whether the minimum indoor coil temperature value in the three-chamber indoor coil temperature values is smaller than a descending temperature threshold value, if so, executing a step 309, otherwise, executing a step 303.
And (3) performing refrigerant control in step 309 when the minimum indoor coil temperature value 24 ℃ of the three indoor coil temperature values corresponding to the indoor unit N is less than the reduced temperature threshold value 25 ℃ and refrigerant accumulation exists.
Step 309: and determining that the current indoor unit has refrigerant accumulation and is the target indoor unit, and executing step 311.
Step 310: for each target indoor unit, executing: when the change trend of the indoor coil temperature is rising, determining a target rising temperature interval, wherein the target rising temperature interval is a rising temperature interval in which the largest indoor coil temperature value in at least two indoor coil temperature values is located; the first electronic expansion valve opening corresponding to the target temperature rise interval is set as the target electronic expansion valve opening of the current target indoor unit, and step 312 is executed.
Step 311: when the variation trend of the indoor coil temperature is descending, determining a target descending temperature interval, wherein the target descending temperature interval is the descending temperature interval in which the minimum indoor coil temperature value in the at least two indoor coil temperature values is located; and taking the second electronic expansion valve opening corresponding to the target temperature drop interval as the target electronic expansion valve opening of the current target indoor unit.
Taking the indoor unit N as an example, the target temperature drop interval is 25-20 ℃, and the target opening degree of the electronic expansion valve is B1.
Step 312: and determining the adjustment amplitude of the electronic expansion valve of each target indoor unit according to the target electronic expansion valve opening and the current electronic expansion valve opening of each target indoor unit.
The current opening degree of the electronic expansion valve of the indoor unit N is N1, the target opening degree of the electronic expansion valve is B1, and the adjustment amplitude of the electronic expansion valve of the indoor unit N is determined to be B1-N1.
Step 313: and adjusting the amplitude according to the electronic expansion valve of each target indoor unit, and adjusting the electronic expansion valve corresponding to each target indoor unit so as to control the refrigerant conveyed to each target indoor unit by the outdoor unit.
And adjusting the amplitude value to be B1-N1 according to the electronic expansion valve of the indoor unit N, and adjusting the electronic expansion valve corresponding to the indoor unit N to control the refrigerant conveyed to the indoor unit N by the outdoor unit.
The content of information interaction, execution process and the like among the devices in the air conditioning system is based on the same concept as the air conditioning system embodiment of the present invention, and specific content can be referred to the description in the method embodiment of the present invention, and is not described herein again.
In summary, the embodiments of the present invention have at least the following effects:
1. in the embodiment of the invention, the refrigerant controller can collect the indoor coil temperature values of each indoor unit at different moments in real time in the operation process of the multi-split air conditioner, judge whether refrigerant accumulation exists in each indoor unit according to the indoor coil temperature values, and control the electronic expansion valve between the target indoor unit and the outdoor unit to control the refrigerant conveyed to the target indoor unit by the outdoor unit when the refrigerant accumulation exists in the target indoor unit. The method can realize closed-loop control of the refrigerant in the multi-split air conditioner by adjusting the opening of the electronic expansion valve in the operation process of the multi-split air conditioner, and is simple to operate and high in timeliness.
2. In the embodiment of the invention, a closed-loop control method is adopted, the real-time running state of the indoor unit and the change trend of the temperature of the indoor coil pipe are dynamically detected during operation, the state of the refrigerant lack is calculated according to the dynamic change of the temperature of the indoor coil pipe, the refrigerant is controlled through the electronic expansion valve, the closed-loop control is realized, the refrigerant accumulation of the multi-split air conditioner during long-time operation of the single indoor unit is prevented, and the product performance and the reliability are improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, 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 process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it is to be noted that: the above description is only a preferred embodiment of the present invention, and is only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A method for controlling refrigerants of a multi-split air conditioner is applied to a refrigerant controller and is characterized by comprising the following steps:
s1: collecting operation information of each indoor unit in the multi-split air conditioner, wherein the operation information comprises at least two indoor coil temperature values, each indoor coil temperature value corresponds to a collection time, and the time difference between the collection time and the current time is within a preset time threshold;
s2: judging whether at least one target indoor unit exists in each indoor unit according to the temperature values of the at least two indoor coils of each indoor unit, wherein the target indoor unit has refrigerant accumulation, if so, executing S3, otherwise, executing S1;
s3: determining the opening degree of a target electronic expansion valve of each target indoor unit;
s4: adjusting the electronic expansion valve corresponding to each target indoor unit according to the opening degree of the target electronic expansion valve of each target indoor unit to control the refrigerant conveyed to each target indoor unit by the outdoor unit, and executing S1;
wherein the content of the first and second substances,
further comprising: presetting an ascending temperature threshold and a descending temperature threshold;
according to at least two indoor coil pipe temperature values of each indoor unit, whether at least one target indoor unit exists in each indoor unit is judged, wherein refrigerant accumulation exists in the target indoor unit, and the method comprises the following steps:
for each of the indoor units, performing: determining the variation trend of the indoor coil temperature according to at least two indoor coil temperature values of the current indoor unit;
when the variation trend of the indoor coil temperature is rising, judging whether the largest indoor coil temperature value in the at least two indoor coil temperature values is smaller than the rising temperature threshold value, if so, determining that the current indoor unit has refrigerant accumulation and is the target indoor unit;
and when the change trend of the indoor coil temperature is descending, judging whether the minimum indoor coil temperature value in the at least two indoor coil temperature values is smaller than the descending temperature threshold value, and if so, determining that the current indoor unit has refrigerant accumulation and is the target indoor unit.
2. The method of claim 1, further comprising:
dividing a temperature range which is not higher than the rising temperature threshold into at least two rising temperature intervals, and setting a first electronic expansion valve opening degree for each rising temperature interval;
dividing a temperature range which is not higher than the falling temperature threshold into at least two falling temperature intervals, and setting a second electronic expansion valve opening degree for each falling temperature interval;
the S3, including:
for each target indoor unit, executing:
when the change trend of the indoor coil temperature is rising, determining a target rising temperature interval, wherein the target rising temperature interval is a rising temperature interval in which the largest indoor coil temperature value in the at least two indoor coil temperature values is located;
taking the opening degree of a first electronic expansion valve corresponding to the target temperature rise interval as the opening degree of a target electronic expansion valve of the current target indoor unit;
when the variation trend of the indoor coil temperature is descending, determining a target descending temperature interval, wherein the target descending temperature interval is the descending temperature interval in which the minimum indoor coil temperature value in the at least two indoor coil temperature values is located;
and taking the opening degree of the second electronic expansion valve corresponding to the target temperature drop interval as the target opening degree of the electronic expansion valve of the current target indoor unit.
3. The method as claimed in claim 1, wherein the refrigerant is supplied to the refrigerant circuit,
the operation information further includes: current electronic expansion valve opening;
the adjusting of the electronic expansion valve corresponding to each target indoor unit according to the opening degree of the target electronic expansion valve of each target indoor unit to control the refrigerant conveyed to each target indoor unit by the outdoor unit includes:
determining the adjustment amplitude of the electronic expansion valve of each target indoor unit according to the target electronic expansion valve opening and the current electronic expansion valve opening of each target indoor unit;
and adjusting the electronic expansion valve corresponding to each target indoor unit according to the electronic expansion valve adjustment amplitude of each target indoor unit so as to control the refrigerant conveyed to each target indoor unit by the outdoor unit.
4. The method as claimed in any one of claims 1 to 3, wherein the refrigerant is supplied from a refrigerant supply unit,
the operation information further includes: an operating mode;
after S1, before S2, further comprising:
determining the operation mode of the multi-split air conditioner according to the operation mode of each indoor unit;
when the operation mode of the multi-split air conditioner is cooling, S1 is performed, and when the operation mode of the multi-split air conditioner is heating, S2 is performed.
5. A multi-split air conditioner, comprising: the system comprises a refrigerant controller, an outdoor unit, at least two indoor units and an electronic expansion valve corresponding to each indoor unit; the outdoor unit is connected with each indoor unit through the corresponding electronic expansion valve;
the refrigerant controller is used for executing:
s1: collecting operation information of each indoor unit, wherein the operation information comprises at least two indoor coil temperature values, each indoor coil temperature value corresponds to a collection time, and the time difference between the collection time and the current time is within a preset time threshold;
s2: judging whether at least one target indoor unit exists in each indoor unit according to the temperature values of the at least two indoor coils of each indoor unit, wherein the target indoor unit has refrigerant accumulation, if so, executing S3, otherwise, executing S1;
s3: determining the opening degree of a target electronic expansion valve of each target indoor unit;
s4: adjusting the electronic expansion valve corresponding to each target indoor unit according to the opening degree of the target electronic expansion valve of each target indoor unit to control the refrigerant conveyed to each target indoor unit by the outdoor unit, and executing S1;
wherein the content of the first and second substances,
the refrigerant controller is further used for setting an ascending temperature threshold and a descending temperature threshold;
the refrigerant controller is configured to, for each of the indoor units, perform: determining the variation trend of the indoor coil temperature according to at least two indoor coil temperature values of the current indoor unit; when the variation trend of the indoor coil temperature is rising, judging whether the largest indoor coil temperature value in the at least two indoor coil temperature values is smaller than the rising temperature threshold value, if so, determining that the current indoor unit has refrigerant accumulation and is the target indoor unit; and when the change trend of the indoor coil temperature is descending, judging whether the minimum indoor coil temperature value in the at least two indoor coil temperature values is smaller than the descending temperature threshold value, and if so, determining that the current indoor unit has refrigerant accumulation and is the target indoor unit.
6. The multi-split air conditioner as claimed in claim 5,
the refrigerant controller is further used for dividing a temperature range not higher than the rising temperature threshold into at least two rising temperature intervals, and setting a first electronic expansion valve opening degree for each rising temperature interval; dividing a temperature range which is not higher than the falling temperature threshold into at least two falling temperature intervals, and setting a second electronic expansion valve opening degree for each falling temperature interval;
the refrigerant controller is configured to, for each target indoor unit, execute:
when the change trend of the indoor coil temperature is rising, determining a target rising temperature interval, wherein the target rising temperature interval is a rising temperature interval in which the largest indoor coil temperature value in the at least two indoor coil temperature values is located; taking the opening degree of a first electronic expansion valve corresponding to the target temperature rise interval as the opening degree of a target electronic expansion valve of the current target indoor unit;
when the variation trend of the indoor coil temperature is descending, determining a target descending temperature interval, wherein the target descending temperature interval is the descending temperature interval in which the minimum indoor coil temperature value in the at least two indoor coil temperature values is located; and taking the opening degree of the second electronic expansion valve corresponding to the target temperature drop interval as the target opening degree of the electronic expansion valve of the current target indoor unit.
7. The multi-split air conditioner as claimed in claim 5,
the operation information further includes: current electronic expansion valve opening;
the refrigerant controller is used for determining the adjustment amplitude of the electronic expansion valve of each target indoor unit according to the target electronic expansion valve opening and the current electronic expansion valve opening of each target indoor unit; and adjusting the electronic expansion valve corresponding to each target indoor unit according to the electronic expansion valve adjustment amplitude of each target indoor unit so as to control the refrigerant conveyed to each target indoor unit by the outdoor unit.
8. A multi-split air conditioner according to any one of claims 5 to 7,
the operation information further includes: an operating mode;
the refrigerant controller is further used for determining the operation mode of the multi-split air conditioner according to the operation mode of each indoor unit; when the operation mode of the multi-split air conditioner is cooling, S1 is performed, and when the operation mode of the multi-split air conditioner is heating, S2 is performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810397382.4A CN108548297B (en) | 2018-04-28 | 2018-04-28 | Multi-split air conditioner and method for controlling refrigerants of multi-split air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810397382.4A CN108548297B (en) | 2018-04-28 | 2018-04-28 | Multi-split air conditioner and method for controlling refrigerants of multi-split air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108548297A CN108548297A (en) | 2018-09-18 |
| CN108548297B true CN108548297B (en) | 2020-07-21 |
Family
ID=63513094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810397382.4A Active CN108548297B (en) | 2018-04-28 | 2018-04-28 | Multi-split air conditioner and method for controlling refrigerants of multi-split air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108548297B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111637527B (en) * | 2020-05-30 | 2021-07-23 | 广东志高暖通设备股份有限公司 | Accurate control method of multi-split system |
| CN111765607A (en) * | 2020-06-19 | 2020-10-13 | 海信（山东）空调有限公司 | Method for controlling electronic expansion valve of multi-split air conditioner, multi-split air conditioner and medium |
| CN117537445B (en) * | 2024-01-10 | 2024-04-05 | 深圳市台冷空调设备有限公司 | Control method of modular air conditioning unit and modular air conditioning unit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982988B (en) * | 2014-05-08 | 2017-06-09 | 广东美的制冷设备有限公司 | Prevent a method and device for dragging many air-conditionings excessively to heat |
| CN104154629B (en) * | 2014-05-26 | 2017-04-05 | 广东美的制冷设备有限公司 | The control method and device of the cold medium flux of multi-split air conditioner |
| US10208986B2 (en) * | 2016-01-15 | 2019-02-19 | Great Source Innovations Llc | Evaporative fluid cooling apparatuses and methods thereof |
| CN106247530B (en) * | 2016-07-29 | 2019-05-21 | 海信（山东）空调有限公司 | More air-conditioning self checking methods are dragged in multitube frequency conversion one |
| CN106765927B (en) * | 2016-12-13 | 2019-07-23 | 青岛海尔空调器有限总公司 | The control method of air-conditioning expansion valve |
| CN107144054B (en) * | 2017-04-14 | 2019-04-16 | 珠海格力电器股份有限公司 | The aperture control method and device of electric expansion valve |
-
2018
- 2018-04-28 CN CN201810397382.4A patent/CN108548297B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108548297A (en) | 2018-09-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10094599B2 (en) | Oil return method for multi-split air conditioning in heating | |
| CN107036256B (en) | The control method of delivery temperature, the control device of delivery temperature and air conditioner | |
| CN111076353B (en) | Electronic expansion valve opening control method and device and air conditioner | |
| CN108548297B (en) | Multi-split air conditioner and method for controlling refrigerants of multi-split air conditioner | |
| CN108195053B (en) | Air conditioner condensation prevention control method and device and computer storage medium | |
| CN109855256B (en) | Air conditioning system evaporation temperature control method and device and air conditioning system | |
| CN107763792B (en) | Control method of multi-connected air conditioning unit | |
| CN107477798B (en) | method and device for controlling refrigerant of air conditioner and air conditioner | |
| CN108361954B (en) | Air conditioner condensation prevention control method and device and computer storage medium | |
| CN110260466B (en) | Air conditioner defrosting control method and device | |
| CN103868299A (en) | Fine adjustment control method and system of electronic expansion valve | |
| CN110686390B (en) | Control method and system for preventing mainboard condensation of frequency converter and air conditioner | |
| CN106895623B (en) | Exhaust temperature control method of air conditioner | |
| CN111059727A (en) | Frequency control method for air conditioner compressor | |
| Chen et al. | A study on the operational stability of a refrigeration system having a variable speed compressor | |
| CN110779160B (en) | Operation control method and device, air conditioner and storage medium | |
| CN105953369A (en) | Control method and device for variable-frequency air conditioner | |
| CN110186150B (en) | Operation control method, control device, air conditioner, and computer-readable storage medium | |
| CN110332649A (en) | A kind of heating antioverloading control method, device and the air conditioner of air conditioner | |
| WO2023173765A1 (en) | Method and apparatus for controlling mobile air conditioner, and mobile air conditioner | |
| CN111023429A (en) | Control method and system and air conditioner | |
| CN111520875B (en) | Control method and system for multi-split air conditioner | |
| CN106196788A (en) | The control method for frequency of compressor of air conditioner and device | |
| CN108375174B (en) | Air conditioner condensation prevention control method and device and computer storage medium | |
| CN110425687B (en) | Refrigerant adjusting method, refrigerant adjusting controller and air conditioning system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |