CN109855256B - Air conditioning system evaporation temperature control method and device and air conditioning system - Google Patents
Air conditioning system evaporation temperature control method and device and air conditioning system Download PDFInfo
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- CN109855256B CN109855256B CN201910135378.5A CN201910135378A CN109855256B CN 109855256 B CN109855256 B CN 109855256B CN 201910135378 A CN201910135378 A CN 201910135378A CN 109855256 B CN109855256 B CN 109855256B
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Abstract
The invention discloses an air conditioning system and an evaporation temperature control method and device of the air conditioning system. The method comprises the steps of obtaining the actual evaporation temperature of a liquid refrigerant in a gas-liquid separator in the outdoor unit, adjusting the operation frequency of a compressor in the outdoor unit according to the target evaporation temperature and the actual evaporation temperature, collecting the operation parameters of each indoor unit when the actual evaporation temperature reaches the target evaporation temperature, judging whether the target evaporation temperature needs to be corrected according to the operation parameters of each indoor unit, and if so, correcting the target evaporation temperature according to a first preset rule; if not, keeping the target evaporation temperature unchanged, and repeating the steps to enable the operation frequency of the compressor to meet the capacity requirement of each indoor unit. The technical scheme provided by the embodiment of the invention can ensure that the running frequency of the compressor meets the capacity requirement of each indoor unit in the air-conditioning system.
Description
Technical Field
The embodiment of the invention relates to the technical field of air conditioners, in particular to an air conditioning system evaporation temperature control method and device and an air conditioning system.
Background
The outdoor unit and the indoor units of the multi-connected long connecting pipe system are separately installed, the connecting pipes of the indoor units are long and short, the longest connecting pipe can reach more than 100 meters, and pressure loss can be formed in the process that the refrigerant flows in the connecting pipe. However, the refrigeration effect of the indoor unit is closely related to the evaporation temperature of the refrigerant in the indoor unit, and how to effectively control the evaporation temperature of the indoor unit becomes an important problem to be solved by the multi-split long-tube system.
Conventionally, the cooling capacity required by each indoor unit is collected to obtain the total demand of the indoor units, and the outdoor unit adjusts the capacity output of the compressor according to the total demand of the indoor units. However, when the connecting pipe is short, the requirement of each indoor unit can be met, and when the connecting pipe is long, the pressure loss of the pipeline is large, and the capacity output of the compressor is often insufficient.
Disclosure of Invention
The invention provides an air conditioning system evaporation temperature control method and device and an air conditioning system, which are used for timely correcting a target evaporation temperature when the target evaporation temperature needs to be corrected, so that the running frequency of a compressor meets the capacity requirement of each indoor unit.
In a first aspect, an embodiment of the present invention provides an evaporation temperature control method for an air conditioning system, where the air conditioning system includes an outdoor unit and a plurality of indoor units, each indoor unit is connected to the outdoor unit through a connecting pipe, and the method includes:
acquiring the actual evaporation temperature of the liquid refrigerant in the gas-liquid separator in the outdoor unit;
adjusting the running frequency of a compressor in the outdoor unit according to the target evaporation temperature and the actual evaporation temperature;
when the difference value between the actual evaporation temperature and the target evaporation temperature is within the tolerance range, collecting the operation parameters of each indoor unit;
judging whether the target evaporation temperature needs to be corrected or not according to the operation parameters of each indoor unit;
if so, correcting the target evaporation temperature according to a first preset rule; if not, keeping the target evaporation temperature unchanged;
and repeating the steps to enable the running frequency of the compressor to meet the capacity requirement of each indoor unit.
Optionally, the operation parameters include return air temperature, outlet air temperature and set temperature, and the step of judging whether the target evaporation temperature needs to be corrected according to the operation parameters of each indoor unit includes:
calculating a first temperature deviation of each indoor unit, wherein the first temperature deviation is a difference value between the return air temperature and the set temperature;
judging whether the first temperature deviations of all the indoor units are smaller than or equal to a first preset value or not;
if yes, the target evaporation temperature does not need to be corrected;
if not, calculating a second temperature deviation of the indoor unit of which the first temperature deviation is greater than the first preset value, wherein the second temperature deviation is the difference value of the return air temperature and the outlet air temperature;
judging whether second temperature deviations of the indoor units with the first temperature deviations larger than the first preset value are all larger than or equal to a second preset value; if yes, the target evaporation temperature does not need to be corrected; if not, the target evaporation temperature needs to be corrected.
Optionally, the modifying the target evaporation temperature according to the first preset rule includes:
judging whether the continuous down-regulation times of the target evaporation temperature are less than the preset times or not;
if so, the target evaporation temperature is reduced by a preset decrement.
Optionally, the product of the preset decrement and the preset number is smaller than the preset amount.
Optionally, the obtaining the actual evaporation temperature of the liquid refrigerant in the gas-liquid separator in the outdoor unit includes:
detecting suction pressure, wherein the suction pressure is the pressure in an air inlet pipe of the gas-liquid separator;
and inquiring a suction pressure and evaporation temperature corresponding table according to the suction pressure to obtain the actual evaporation temperature.
In a second aspect, an embodiment of the present invention further provides an evaporation temperature control device for an air conditioning system, where the air conditioning system includes an outdoor unit and a plurality of indoor units, each indoor unit is connected to the outdoor unit through a connecting pipe, and the device includes: the device comprises an actual evaporation temperature acquisition module, a compressor operation frequency adjustment module, an operation parameter acquisition module, a first judgment module, a target evaporation temperature correction module and a target evaporation temperature holding module;
the actual evaporation temperature acquisition module is used for acquiring the actual evaporation temperature of the liquid refrigerant in the gas-liquid separator in the outdoor unit;
the compressor operation frequency adjusting module is used for adjusting the operation frequency of the compressor in the outdoor unit according to the target evaporation temperature and the actual evaporation temperature;
the operation parameter acquisition module is used for acquiring operation parameters of each indoor unit when the actual evaporation temperature reaches the target evaporation temperature;
the first judgment module is used for judging whether the target evaporation temperature needs to be corrected or not according to the operation parameters of each indoor unit;
the target evaporation temperature correction module is used for correcting the target evaporation temperature according to a first preset rule when the target evaporation temperature needs to be corrected;
and the target evaporation temperature maintaining module is used for maintaining the target evaporation temperature unchanged when the target evaporation temperature does not need to be corrected.
Optionally, the operating parameters include return air temperature, outlet air temperature and set temperature, and the first judging module includes a first temperature deviation calculating module, a first temperature deviation judging module, a second temperature deviation calculating module and a second temperature deviation judging module;
the first temperature deviation calculation module is used for calculating first temperature deviation of each indoor unit, wherein the first temperature deviation is the difference value between the return air temperature and the set temperature;
the first temperature deviation judging module is used for judging whether the first temperature deviations of all the indoor units are smaller than or equal to a first preset value or not; if yes, the target evaporation temperature does not need to be corrected;
the second temperature deviation calculation module is used for calculating a second temperature deviation of the indoor unit of which the first temperature deviation is greater than the first preset value when the first temperature deviation of at least one indoor unit is greater than the first preset value, wherein the second temperature deviation is the difference value of the return air temperature and the outlet air temperature;
the second temperature deviation judging module is used for judging whether the second temperature deviations of the indoor units with the first temperature deviations larger than the first preset value are all larger than or equal to a second preset value; if yes, the target evaporation temperature does not need to be corrected; if not, the target evaporation temperature needs to be corrected.
Optionally, the target evaporation temperature correction module includes a down-regulation frequency judgment module and a target evaporation temperature down-regulation module;
the down-regulation frequency judging module is used for judging whether the continuous down-regulation frequency of the target evaporation temperature is less than the preset frequency;
and the target evaporation temperature down-regulation module is used for reducing the target evaporation temperature by a preset decrement when the continuous down-regulation times of the target evaporation temperature are less than the preset times.
Optionally, the product of the preset decrement and the preset number is smaller than the preset amount.
In a third aspect, an embodiment of the present invention further provides an air conditioning system, including the evaporation temperature control device of the air conditioning system according to any embodiment of the present invention.
According to the evaporation temperature control method of the air conditioning system, whether the target evaporation temperature needs to be corrected or not is judged in real time according to the operation parameters of each indoor unit, and the target evaporation temperature is corrected in time when needing to be corrected, so that the operation frequency of the compressor meets the capacity requirement of each indoor unit, the problem that the capacity requirement of the indoor unit with long connecting pipes between the indoor unit and the outdoor unit cannot be met due to the fact that the operation frequency of the compressor is adjusted only according to the total capacity requirement of a plurality of indoor units in the prior art is solved, and the effect that the operation frequency of the compressor meets the capacity requirement of each indoor unit is achieved.
Drawings
Fig. 1 is a flowchart of an evaporation temperature control method of an air conditioning system according to an embodiment of the present invention;
fig. 2 is a flowchart for determining whether the target evaporation temperature needs to be corrected according to the operation parameters of each indoor unit according to the second embodiment of the present invention;
FIG. 3 is a flowchart illustrating a second embodiment of the present invention, wherein the target evaporation temperature is modified according to a first predetermined rule;
fig. 4 is a schematic structural diagram of an evaporation temperature control device of an air conditioning system according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of an evaporation temperature control method of an air conditioning system according to an embodiment of the present invention. The present embodiment is applicable to an air conditioning system for performing evaporation temperature control, where the air conditioning system generally includes an outdoor unit and a plurality of indoor units, each of the indoor units is connected to the outdoor unit through a connecting pipe, and the method may be performed by the evaporation temperature control device of the air conditioning system provided in the embodiment of the present invention, where the device may be implemented by software and/or hardware, and the device may be integrated in the air conditioning system. Referring to fig. 1, the method of the embodiment of the present invention specifically includes the following steps:
and S110, acquiring the actual evaporation temperature of the liquid refrigerant in the gas-liquid separator in the outdoor unit.
Optionally, the obtaining the actual evaporation temperature of the liquid refrigerant in the gas-liquid separator in the outdoor unit includes: and detecting the suction pressure, and inquiring a suction pressure and evaporation temperature corresponding table according to the suction pressure to obtain the actual evaporation temperature.
The suction pressure is the pressure in the air inlet pipe of the gas-liquid separator, and the pressure of the gaseous refrigerant in the gas-liquid separator is close to the pressure in the air inlet pipe of the gas-liquid separator, so that the suction pressure measured by the suction pressure sensor arranged in the air inlet pipe of the gas-liquid separator can be regarded as the pressure of the gaseous refrigerant in the gas-liquid separator. The actual evaporation temperature of the liquid refrigerant in the gas-liquid separator and the pressure of the gaseous refrigerant in the gas-liquid separator have a one-to-one correspondence, and when the suction pressure is detected, namely the pressure of the gaseous refrigerant in the gas-liquid separator is determined, the actual evaporation temperature can be obtained according to the suction pressure and evaporation temperature correspondence table.
And S120, adjusting the running frequency of the compressor in the outdoor unit according to the target evaporation temperature and the actual evaporation temperature.
Specifically, the initial value of the target evaporation temperature may be set by a method known to those skilled in the art, and the present application does not limit the initial value. For example, the target evaporation temperature of the liquid refrigerant in the gas-liquid separator to be controlled by the compressor in the outdoor unit is calculated according to the return air temperature of each indoor unit connected to the outdoor unit through the connecting pipe and the heat exchange temperature difference required by each indoor unit during refrigeration.
Specifically, when the difference between the target evaporation temperature and the actual evaporation temperature is large, the operating frequency of the compressor is increased to reduce the difference between the target evaporation temperature and the actual evaporation temperature, and when the difference between the target evaporation temperature and the actual evaporation temperature is small, the operating frequency of the compressor is slowly increased or kept unchanged. Finally, the difference between the target evaporation temperature and the actual evaporation temperature is controlled within a tolerance range, which may be 1 ℃.
And S130, when the difference value between the actual evaporation temperature and the target evaporation temperature is within the tolerance range, collecting the operation parameters of each indoor unit.
S140, judging whether the target evaporation temperature needs to be corrected or not according to the operation parameters of each indoor unit, and if so, correcting the target evaporation temperature according to a first preset rule; if not, the target evaporation temperature is kept unchanged.
Specifically, whether the operation frequency of the current compressor meets the capacity requirement of each indoor unit or not is judged according to the operation parameters of each indoor unit, and if the operation frequency of the current compressor meets the capacity requirement of each indoor unit, the target evaporation temperature does not need to be corrected; if the current operating frequency of the compressor cannot meet the capacity requirement of each indoor unit, the target evaporating temperature needs to be corrected.
And S150, repeatedly executing S110-S140 to enable the operation frequency of the compressor to meet the capacity requirement of each indoor unit.
Specifically, after the target evaporation temperature is corrected to obtain the corrected target evaporation temperature, the operating frequency of the compressor is continuously adjusted according to the corrected target evaporation temperature and the actual evaporation temperature, so that the operating frequency of the compressor meets the capacity requirement of each indoor unit. By repeatedly executing S110-S140, namely the target evaporation temperature is continuously corrected, the operation frequency of the compressor can overcome the pressure loss of the refrigerant in the connecting pipeline, and further the operation frequency of the compressor meets the capacity requirement of each indoor unit, namely the refrigeration effect of each indoor unit is ensured.
According to the evaporation temperature control method of the air conditioning system, whether the target evaporation temperature needs to be corrected or not is judged in real time according to the operation parameters of each indoor unit, and the target evaporation temperature is corrected in time when needing to be corrected, so that the operation frequency of the compressor meets the capacity requirement of each indoor unit, the problem that the capacity requirement of the indoor unit with long connecting pipes between the indoor unit and the outdoor unit cannot be met due to the fact that the operation frequency of the compressor is adjusted only according to the total capacity requirement of a plurality of indoor units in the prior art is solved, and the effect that the operation frequency of the compressor meets the capacity requirement of each indoor unit is achieved.
Example two
The embodiment is embodied and optimized on the basis of the above technical solution, fig. 2 is a flowchart for determining whether the target evaporation temperature needs to be corrected according to the operation parameters of each indoor unit according to a second embodiment of the present invention, as shown in fig. 2, specifically including the following steps:
and S141, calculating a first temperature deviation of each indoor unit, wherein the first temperature deviation is a difference value between the return air temperature and the set temperature.
The collected operating parameters of the indoor unit comprise return air temperature, outlet air temperature and set temperature. The return air temperature refers to the temperature at the return air inlet of the indoor unit, the outlet air temperature refers to the temperature at the outlet of the indoor unit, and the set temperature refers to the temperature set by a user.
S142, judging whether the first temperature deviations of all the indoor units are smaller than or equal to a first preset value; if so, the target evaporation temperature does not need to be corrected.
Specifically, after the air conditioning system operates for a period of time, the refrigeration condition of part of the indoor units can meet the requirement of a customer, namely the return air temperature is close to the set temperature. And the cold quantity that some indoor sets lead to providing because of the connecting pipe is longer can't satisfy customer's demand, and return air temperature is great with the settlement temperature difference promptly. When the first temperature deviations of all the indoor units are smaller than or equal to a first preset value, the refrigeration conditions of all the indoor units are determined to meet the requirements of customers, and therefore the target evaporation temperature does not need to be corrected; when the first temperature deviation of at least one indoor unit is larger than a first preset value, the refrigeration condition of part of the indoor units does not meet the requirement of a customer, so that the target evaporation temperature needs to be corrected, and the running frequency of the compressor is adjusted. Illustratively, the first preset value is 3 ℃.
S143, if the first indoor temperature deviation is larger than the first preset value, calculating a second indoor temperature deviation of the indoor unit of which the first temperature deviation is larger than the first preset value, wherein the second temperature deviation is the difference value between the return air temperature and the outlet air temperature.
S144, judging whether second temperature deviations of the indoor unit with the first temperature deviation larger than the first preset value are larger than or equal to a second preset value or not; if yes, the target evaporation temperature does not need to be corrected; if not, the target evaporation temperature needs to be corrected.
Specifically, the difference between the return air temperature and the outlet air temperature is also the heat exchange temperature difference between the indoor air and the liquid refrigerant in the heat exchanger in the indoor unit, and when the difference between the return air temperature and the outlet air temperature is greater than or equal to a second preset value, the cold energy provided to the indoor unit by the compressor in the outdoor unit can be considered to be sufficient; when the difference value between the return air temperature and the outlet air temperature is smaller than a second preset value, the cold quantity provided by the compressor in the outdoor unit to the indoor unit is insufficient, so that the target evaporation temperature needs to be corrected, and the running frequency of the compressor is adjusted. Illustratively, the second preset value is 14 ℃.
Fig. 3 is a flowchart for correcting a target evaporation temperature according to a first preset rule according to a second embodiment of the present invention, as shown in fig. 3, specifically including the following steps:
and S145, judging whether the continuous down-regulation times of the target evaporation temperature are less than the preset times.
And S146, if so, reducing the target evaporation temperature by a preset decrement.
Optionally, the product of the preset decrement and the preset number is smaller than the preset amount.
Illustratively, the target evaporation temperature is a decrease correction, when the target evaporation temperature is judged to need to be corrected, the target evaporation temperature is corrected downward by 2 ℃, after 5 minutes, whether the target evaporation temperature needs to be corrected is judged, if the target evaporation temperature needs to be corrected, the target evaporation temperature is corrected downward by 2 ℃, and so on, and it is noted that the target evaporation temperature cannot be corrected downward more than 5 times, that is, the target evaporation temperature is corrected downward by 10 ℃ at most. Further, when it is judged that the target evaporation temperature does not need to be corrected, the target evaporation temperature may be kept constant or may be adjusted upward by 2 ℃.
EXAMPLE III
Fig. 4 is a schematic structural view of an evaporation temperature control device of an air conditioning system according to a third embodiment of the present invention, where the air conditioning system includes an outdoor unit and a plurality of indoor units, each of the indoor units is connected to the outdoor unit through a connecting pipe, and the device includes: an actual evaporation temperature obtaining module 110, a compressor operation frequency adjusting module 120, an operation parameter collecting module 130, a first judging module 140, a target evaporation temperature correcting module 150 and a target evaporation temperature maintaining module 160;
an actual evaporation temperature obtaining module 110, configured to obtain an actual evaporation temperature of a liquid refrigerant in a gas-liquid separator in the outdoor unit;
a compressor operation frequency adjusting module 120 for adjusting the operation frequency of the compressor in the outdoor unit according to the target evaporation temperature and the actual evaporation temperature;
an operation parameter acquisition module acquires 130 operation parameters of each indoor unit when the actual evaporation temperature reaches the target evaporation temperature;
the first judging module 140 is configured to judge whether the target evaporation temperature needs to be corrected according to the operation parameters of each indoor unit;
the target evaporation temperature correction module 150 is used for correcting the target evaporation temperature according to a first preset rule when the target evaporation temperature needs to be corrected;
and a target evaporation temperature maintaining module 160 for maintaining the target evaporation temperature when the target evaporation temperature does not need to be corrected.
According to the evaporation temperature control method of the air conditioning system, whether the target evaporation temperature needs to be corrected or not is judged in real time through the first judging module according to the operation parameters of each indoor unit, the target evaporation temperature correcting module corrects the target evaporation temperature in time when the target evaporation temperature needs to be corrected, the operation frequency of the compressor is adjusted by the compressor operation frequency adjusting module according to the target evaporation temperature and the actual evaporation temperature so as to meet the capacity requirement of each indoor unit, the problem that the capacity requirement of the indoor unit with a long connecting pipe between the indoor unit and the outdoor unit cannot be met due to the fact that the operation frequency of the compressor is adjusted only according to the total capacity requirement of a plurality of indoor units in the prior art is solved, and the effect that the operation frequency of the compressor meets the capacity requirement of.
On the basis of the above technical solution, optionally, the operation parameters include return air temperature, outlet air temperature and set temperature, and the first judgment module 140 includes a first temperature deviation calculation module, a first temperature deviation judgment module, a second temperature deviation calculation module and a second temperature deviation judgment module;
the first temperature deviation calculation module is used for calculating first temperature deviation of each indoor unit, wherein the first temperature deviation is the difference value between the return air temperature and the set temperature;
the first temperature deviation judging module is used for judging whether the first temperature deviations of all the indoor units are smaller than or equal to a first preset value or not; if yes, the target evaporation temperature does not need to be corrected;
the second temperature deviation calculation module is used for calculating a second temperature deviation of the indoor unit of which the first temperature deviation is greater than the first preset value when the first temperature deviation of at least one indoor unit is greater than the first preset value, wherein the second temperature deviation is the difference value of the return air temperature and the outlet air temperature;
the second temperature deviation judging module is used for judging whether the second temperature deviations of the indoor units with the first temperature deviations larger than the first preset value are all larger than or equal to a second preset value; if yes, the target evaporation temperature does not need to be corrected; if not, the target evaporation temperature needs to be corrected.
Optionally, the target evaporation temperature correction module 150 includes a down-regulation frequency judgment module and a target evaporation temperature down-regulation module;
the down-regulation frequency judging module is used for judging whether the continuous down-regulation frequency of the target evaporation temperature is less than the preset frequency;
and the target evaporation temperature down-regulation module is used for reducing the target evaporation temperature by a preset decrement when the continuous down-regulation times of the target evaporation temperature are less than the preset times.
Optionally, the product of the preset decrement and the preset number is smaller than the preset amount.
Optionally, the actual evaporation temperature obtaining module 110 includes a suction pressure detecting module and an actual evaporation temperature querying module;
the air suction pressure detection module is used for detecting air suction pressure, wherein the air suction pressure is the pressure in an air inlet pipe of the gas-liquid separator;
and the actual evaporation temperature query module is used for querying the suction pressure and evaporation temperature corresponding table according to the suction pressure to obtain the actual evaporation temperature.
The evaporation temperature control device of the air conditioning system provided by the third embodiment of the invention can be used for executing the evaporation temperature control method of the air conditioning system provided by any embodiment, and has corresponding functions and beneficial effects of the execution method.
Example four
The embodiment of the invention provides an air conditioning system, which comprises the evaporation temperature control device of the air conditioning system in any embodiment of the invention.
The air conditioning system provided by the fourth embodiment of the invention comprises the evaporation temperature control device of the air conditioning system provided by any embodiment, so that the air conditioning system has corresponding functions and beneficial effects.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. An evaporation temperature control method of an air conditioning system, wherein the air conditioning system comprises an outdoor unit and a plurality of indoor units, and each indoor unit is connected with the outdoor unit through a connecting pipe, the method is characterized by comprising the following steps:
s110: acquiring the actual evaporation temperature of the liquid refrigerant in the gas-liquid separator in the outdoor unit;
s120: adjusting the running frequency of a compressor in the outdoor unit according to the target evaporation temperature and the actual evaporation temperature;
s130: when the difference value between the actual evaporation temperature and the target evaporation temperature is within the tolerance range, collecting the operation parameters of each indoor unit;
s140: judging whether the target evaporation temperature needs to be corrected or not according to the operation parameters of each indoor unit;
if so, correcting the target evaporation temperature according to a first preset rule; if not, keeping the target evaporation temperature unchanged;
wherein the correcting the target evaporation temperature according to a first preset rule comprises:
judging whether the continuous down-regulation times of the target evaporation temperature are less than preset times or not;
if so, reducing the target evaporation temperature by a preset decrement;
s150: and repeating the steps S110 to S140 to enable the operating frequency of the compressor to meet the capacity requirement of each indoor unit.
2. The evaporation temperature control method of an air conditioning system according to claim 1, wherein the operation parameters include a return air temperature, an outlet air temperature, and a set temperature, and the determining whether the target evaporation temperature needs to be corrected according to the operation parameters of each indoor unit includes:
calculating a first temperature deviation of each indoor unit, wherein the first temperature deviation is a difference value between the return air temperature and the set temperature;
judging whether the first temperature deviations of all the indoor units are smaller than or equal to a first preset value or not;
if yes, the target evaporation temperature does not need to be corrected;
if not, calculating a second temperature deviation of the indoor unit, wherein the first temperature deviation is greater than the first preset value, and the second temperature deviation is the difference value between the return air temperature and the outlet air temperature;
judging whether second temperature deviations of the indoor units with the first temperature deviations larger than the first preset value are all larger than or equal to a second preset value;
if yes, the target evaporation temperature does not need to be corrected;
if not, the target evaporation temperature needs to be corrected.
3. The evaporative temperature control method of claim 1, wherein the product of the preset decrement and the preset number is less than a preset amount.
4. The evaporation temperature control method of claim 1, wherein said obtaining the actual evaporation temperature of the liquid refrigerant in the gas-liquid separator of the outdoor unit comprises:
detecting a suction pressure, wherein the suction pressure is a pressure in an air inlet pipe of the gas-liquid separator;
and inquiring a corresponding table of the suction pressure and the evaporation temperature according to the suction pressure to obtain the actual evaporation temperature.
5. An evaporation temperature control device of an air conditioning system, the air conditioning system comprising an outdoor unit and a plurality of indoor units, each of the indoor units being connected to the outdoor unit through a connecting pipe, the evaporation temperature control device comprising: the device comprises an actual evaporation temperature acquisition module, a compressor operation frequency adjustment module, an operation parameter acquisition module, a first judgment module, a target evaporation temperature correction module and a target evaporation temperature holding module;
the actual evaporation temperature acquisition module is used for acquiring the actual evaporation temperature of the liquid refrigerant in the gas-liquid separator in the outdoor unit;
the compressor operation frequency adjusting module is used for adjusting the operation frequency of the compressor in the outdoor unit according to the target evaporation temperature and the actual evaporation temperature;
the operation parameter acquisition module is used for acquiring operation parameters of each indoor unit when the actual evaporation temperature reaches a target evaporation temperature;
the first judgment module is used for judging whether the target evaporation temperature needs to be corrected or not according to the operation parameters of each indoor unit;
the target evaporation temperature correction module is used for correcting the target evaporation temperature according to a first preset rule when the target evaporation temperature needs to be corrected;
wherein the correcting the target evaporation temperature according to a first preset rule comprises:
judging whether the continuous down-regulation times of the target evaporation temperature are less than preset times or not;
if so, reducing the target evaporation temperature by a preset decrement;
and the target evaporation temperature maintaining module is used for maintaining the target evaporation temperature unchanged when the target evaporation temperature does not need to be corrected.
6. The evaporation temperature control device of an air conditioning system according to claim 5, wherein the operation parameters include a return air temperature, an outlet air temperature and a set temperature, and the first judgment module includes a first temperature deviation calculation module, a first temperature deviation judgment module, a second temperature deviation calculation module and a second temperature deviation judgment module;
the first temperature deviation calculation module is used for calculating first temperature deviation of each indoor unit, wherein the first temperature deviation is a difference value between the return air temperature and the set temperature;
the first temperature deviation judging module is used for judging whether the first temperature deviations of all the indoor units are smaller than or equal to a first preset value or not; if yes, the target evaporation temperature does not need to be corrected;
the second temperature deviation calculation module is used for calculating a second temperature deviation of the indoor unit of which the first temperature deviation is greater than a first preset value when the first temperature deviation of at least one indoor unit is greater than the first preset value, wherein the second temperature deviation is the difference value between the return air temperature and the outlet air temperature;
the second temperature deviation judging module is used for judging whether the second temperature deviations of the indoor units with the first temperature deviations larger than the first preset value are all larger than or equal to a second preset value; if yes, the target evaporation temperature does not need to be corrected; if not, the target evaporation temperature needs to be corrected.
7. The evaporation temperature control device of an air conditioning system according to claim 5, wherein the target evaporation temperature correction module comprises a down-regulation frequency judgment module and a target evaporation temperature down-regulation module;
the down-regulation frequency judging module is used for judging whether the continuous down-regulation frequency of the target evaporation temperature is less than a preset frequency;
and the target evaporation temperature down-regulation module is used for reducing the target evaporation temperature by a preset decrement when the continuous down-regulation times of the target evaporation temperature are less than the preset times.
8. The evaporative temperature control apparatus of claim 7, wherein the product of the predetermined decrement and the predetermined number of times is less than a predetermined amount.
9. An air conditioning system characterized by comprising the air conditioning system evaporating temperature controlling apparatus as set forth in any one of claims 5 to 8.
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| CN111578462B (en) * | 2019-02-18 | 2021-11-02 | 新奥数能科技有限公司 | Compressor regulation method and device of air conditioning system, readable medium and electronic equipment |
| CN112032921B (en) * | 2020-08-06 | 2022-01-04 | 广东Tcl智能暖通设备有限公司 | Air conditioner control method, air conditioner and storage medium |
| CN112665251B (en) * | 2020-12-28 | 2022-06-17 | 江苏拓米洛环境试验设备有限公司 | Control method and device for variable-frequency compressor of refrigerating system and refrigerating system |
| CN113280462B (en) * | 2021-05-31 | 2023-01-03 | 青岛海信日立空调系统有限公司 | Cloud multi-connected air conditioning unit and control method thereof |
| CN114754532B (en) * | 2022-04-26 | 2024-02-20 | 青岛海尔空调电子有限公司 | Method, device, equipment and storage medium for controlling refrigeration house condensing unit |
| CN115682395A (en) * | 2022-11-04 | 2023-02-03 | 宁波奥克斯电气股份有限公司 | Multi-split air conditioner evaporation temperature control method and device and multi-split air conditioner |
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| CN107606834B (en) * | 2017-09-12 | 2020-09-04 | 广东美的暖通设备有限公司 | Control method of multi-split system and multi-split system |
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