阅读说明：本技术 一种基于排气侧参数的多联机系统冷媒量检测控制方法 (Exhaust side parameter-based refrigerant quantity detection control method for multi-split air conditioning system ) 是由 刘红斌 麦享世 于 2021-01-21 设计创作，主要内容包括：本发明公开了一种基于排气侧参数的多联机系统冷媒量检测控制方法,基于排气温度T1、排气压力P1、排气过热度SH和压缩机输入侧电流值I进行比较判断,根据各项参数判断结果中,若存在有至少三项参数的判断结果显示为高于/低于预置正常参数范围的情况时,或者存在有两项参数的判断结果显示为高于/低于预置正常参数范围且另外两项参数的判断结果显示为预置正常参数范围内的情况时,则判定为冷媒量多/冷媒量少,其它参数判断结果的情况重复步骤S1-S3,持续进行监测及判断。(The invention discloses a refrigerant quantity detection control method of a multi-split air conditioner system based on exhaust side parameters, which is characterized in that the detection control method is based on exhaust temperature T1, exhaust pressure P1, exhaust superheat SH and a current value I at the input side of a compressor, and according to the judgment results of various parameters, if the judgment results of at least three parameters are higher than or lower than a preset normal parameter range, or the judgment results of two parameters are higher than or lower than the preset normal parameter range and the judgment results of the other two parameters are within the preset normal parameter range, the refrigerant quantity is judged to be large/small, and the steps S1-S3 are repeated under the judgment results of other parameters, so that the monitoring and the judgment are continuously carried out.)

1. A refrigerant quantity detection control method of a multi-split system based on exhaust side parameters is characterized by comprising the following steps: the method comprises the following steps:

s1, after an outdoor unit (1) and all indoor units (2) of the multi-split air conditioner are started to operate for preset time, monitoring and acquiring the exhaust temperature T1, the exhaust pressure P1, the exhaust superheat SH and the current value I of the input side of a compressor of the multi-split air conditioner system;

s2, comparing and judging the monitored exhaust temperature T1, the exhaust pressure P1, the exhaust superheat SH and the current value I of the input side of the compressor based on various preset normal parameter ranges corresponding to the current outdoor environment temperature T4;

and S3, according to the judgment results of the parameters, if the judgment results of at least three parameters are higher than or lower than the preset normal parameter range, or the judgment results of two parameters are higher than or lower than the preset normal parameter range and the judgment results of the other two parameters are within the preset normal parameter range, judging that the refrigerant quantity is large or the refrigerant quantity is small, and repeating the steps S1-S3 under the judgment results of other parameters to continuously monitor and judge.

2. The method for detecting and controlling the refrigerant quantity of the multi-split air conditioning system based on the exhaust side parameter as claimed in claim 1, wherein: if the judgment results of the four parameters are higher than the preset normal parameter range, or the judgment results of the three parameters are higher than the preset normal parameter range and the judgment results of the other parameters are within the preset normal parameter range, judging that the serious refrigerant quantity is large; and if the judgment results of the three parameters are higher than the preset normal parameter range and the judgment result of one parameter is lower than the preset normal parameter range, or the judgment results of the two parameters are higher than the preset normal parameter range and the judgment results of the other two parameters are within the preset normal parameter range, judging that the general refrigerant quantity is large.

3. The method for detecting and controlling the refrigerant quantity of the multi-split air conditioning system based on the exhaust side parameter as claimed in claim 1, wherein: if the judgment results of four parameters are lower than the preset normal parameter range, or the judgment results of three parameters are lower than the preset normal parameter range and the judgment results of the other parameters are within the preset normal parameter range, the serious refrigerant quantity is judged to be less; and if the judgment results of the three parameters are lower than the preset normal parameter range and the judgment result of one parameter is higher than the preset normal parameter range, or the judgment results of the two parameters are lower than the preset normal parameter range and the judgment results of the other two parameters are within the preset normal parameter range, judging that the common refrigerant quantity is small.

4. The method for detecting and controlling the refrigerant quantity of the multi-split air conditioning system based on the exhaust side parameters as claimed in claim 3, wherein: when the amount of the refrigerant is determined to be serious, the refrigerant in the refrigerant tank (31) is filled into the multi-split system through the gas-liquid separator (12) by controlling the filling electromagnetic valve (32) between the refrigerant tank (31) and the gas-liquid separator (12) to be opened for 6min and then closed, and then the multi-split system is continuously operated for a period of time, and then the steps S1-S3 are repeated for continuously monitoring and judging.

5. The method for detecting and controlling the refrigerant quantity of the multi-split air conditioning system based on the exhaust side parameters as claimed in claim 3, wherein: when the general refrigerant quantity is small, the refrigerant in the refrigerant tank (31) is filled into the multi-split system through the gas-liquid separator (12) by controlling the filling electromagnetic valve (32) between the refrigerant tank (31) and the gas-liquid separator (12) to be opened for 3min and then closed, and then the multi-split system is continuously operated for a period of time, and the steps S1-S3 are repeated for monitoring and judging.

6. The method for detecting and controlling the refrigerant quantity of the multi-split system based on the exhaust side parameters as recited in claim 4 or 5, wherein: and during the refrigerant charging period, monitoring and judging various parameters in real time, wherein when the refrigerant quantity is large, the charging electromagnetic valve (32) is immediately closed, and the steps S1-S3 are repeated for monitoring and judging after the multi-split air-conditioning system continuously operates for a period of time.

7. The method for detecting and controlling the refrigerant quantity of the multi-split air conditioning system based on the exhaust side parameter as claimed in claim 1, wherein: if there are two parameter judgment results that are higher than the preset normal parameter range and the other two parameter judgment results that are lower than the preset normal parameter range, or if there are two parameter judgment results that are higher than the preset normal parameter range, the third parameter judgment result that is lower than the preset normal parameter range, and the fourth parameter judgment result that is within the preset normal parameter range, then steps S1-S3 are repeated to continue the detection and judgment.

8. The method for detecting and controlling the refrigerant quantity of the multi-split air conditioning system based on the exhaust side parameter as claimed in claim 1, wherein: and repeating the steps S1-S3 to continuously detect and judge if two judgment results of the parameters are lower than the preset normal parameter range and the other two judgment results of the parameters are lower than the preset normal parameter range, or if two judgment results of the parameters are lower than the preset normal parameter range, the third judgment result is higher than the preset normal parameter range and the fourth judgment result is in the preset normal parameter range.

9. The method for detecting and controlling the refrigerant quantity of the multi-split air conditioning system based on the exhaust side parameter as claimed in claim 1, wherein: the exhaust superheat SH is the difference between the exhaust temperature T1 and the saturation temperature corresponding to the exhaust pressure P1.

10. The method for detecting and controlling the refrigerant quantity of the multi-split air conditioning system based on the exhaust side parameter as claimed in claim 1, wherein: the preset time is 30 min.

Technical Field

The invention relates to the technical field of air conditioners, in particular to a method for detecting and controlling the refrigerant quantity of a multi-split air conditioner system based on exhaust side parameters.

Background

Generally, each air conditioner manufacturer fills a refrigerant before the air conditioner leaves a factory, and some air conditioner manufacturers do not need to additionally add the refrigerant during installation, but some air conditioner manufacturers, especially multi-split air conditioning systems, need to additionally add a certain amount of the refrigerant during system installation and debugging because installation conditions are different, the number of indoor units is different, and the lengths of connecting pipelines of the indoor units and the outdoor units are different.

At present, the extra refrigerant amount added when the air conditioning system in the industry is installed and debugged is generally calculated according to the standard of the extra refrigerant amount of the pipeline length of different specifications by firstly recording pipelines of various specifications and models during installation, and calculating after converting a part of elbows, branch pipes and the like according to a certain standard, so that the extra refrigerant amount needing to be added is finally obtained.

When the refrigerant is added on site, whether the refrigerant is added is measured by an electronic scale according to the calculated amount of the refrigerant.

The operation process is quite complicated, information such as pipe length, specification and the like needs to be accurately measured, and in the installation process of the multi-split air-conditioning system, due to the fact that pipelines are complex, the pipe length is very long, and a certain fall possibly exists, the calculation accuracy completely depends on the measurement accuracy of the specification and the length of the pipelines, and when a refrigerant is added, an electronic scale needs to be used for accurately weighing. The operation process is very cumbersome and the accuracy is very low.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a method for detecting and controlling the refrigerant quantity of a multi-split system based on exhaust side parameters.

In order to achieve the above object, the present invention provides a method for detecting and controlling refrigerant quantity of a multi-split system based on exhaust side parameters, comprising the following steps:

s1, after the outdoor unit and all indoor units of the multi-split air conditioner are started to operate for a preset time, monitoring and acquiring the exhaust temperature T1, the exhaust pressure P1, the exhaust superheat SH and the current value I of the input side of the compressor of the multi-split air conditioner system;

s2, comparing and judging the monitored exhaust temperature T1, the exhaust pressure P1, the exhaust superheat SH and the current value I of the input side of the compressor based on various preset normal parameter ranges corresponding to the current outdoor environment temperature T4;

and S3, according to the judgment results of the parameters, if the judgment results of at least three parameters are higher than or lower than the preset normal parameter range, or the judgment results of two parameters are higher than or lower than the preset normal parameter range and the judgment results of the other two parameters are within the preset normal parameter range, judging that the refrigerant quantity is large or the refrigerant quantity is small, and repeating the steps S1-S3 under the judgment results of other parameters to continuously monitor and judge.

Further, if the judgment result of four parameters is higher than the preset normal parameter range, or the judgment result of three parameters is higher than the preset normal parameter range and the judgment result of the other one parameter is within the preset normal parameter range, the serious refrigerant quantity is judged to be large; and if the judgment results of the three parameters are higher than the preset normal parameter range and the judgment result of one parameter is lower than the preset normal parameter range, or the judgment results of the two parameters are higher than the preset normal parameter range and the judgment results of the other two parameters are within the preset normal parameter range, judging that the general refrigerant quantity is large.

Further, if the judgment result of four parameters is lower than the preset normal parameter range, or the judgment result of three parameters is lower than the preset normal parameter range and the judgment result of the other one parameter is within the preset normal parameter range, the refrigerant quantity is judged to be serious; and if the judgment results of the three parameters are lower than the preset normal parameter range and the judgment result of one parameter is higher than the preset normal parameter range, or the judgment results of the two parameters are lower than the preset normal parameter range and the judgment results of the other two parameters are within the preset normal parameter range, judging that the common refrigerant quantity is small.

Further, when the amount of the refrigerant is determined to be serious, the refrigerant in the refrigerant tank is filled into the multi-split system through the gas-liquid separator by controlling the filling electromagnetic valve between the refrigerant tank and the gas-liquid separator to be opened for 6min and then closed, and then the multi-split system is continuously operated for a period of time, and then the steps S1-S3 are repeated for continuous monitoring and determination.

Further, when the general refrigerant amount is judged to be small, the refrigerant in the refrigerant tank is filled into the multi-split system through the gas-liquid separator by controlling the filling electromagnetic valve between the refrigerant tank and the gas-liquid separator to be closed after being opened for 3min, and then the multi-split system is continuously operated for a period of time, and the steps S1-S3 are repeated for monitoring and judging.

And further, monitoring and judging various parameters in real time during refrigerant charging, wherein when the refrigerant quantity is large, the charging electromagnetic valve is immediately closed, and the steps S1-S3 are repeated to monitor and judge after the multi-split air-conditioning system continuously operates for a period of time.

Further, if there are two parameter judgment results that are higher than the preset normal parameter range and the other two parameter judgment results that are lower than the preset normal parameter range, or there are two parameter judgment results that are higher than the preset normal parameter range, the third parameter judgment result that is lower than the preset normal parameter range, and the fourth parameter judgment result that is within the preset normal parameter range, the steps S1-S3 are repeated to continuously detect and judge.

Further, if there are two parameter judgment results that are lower than the preset normal parameter range and the other two parameter judgment results that are lower than the preset normal parameter range, or there are two parameter judgment results that are lower than the preset normal parameter range, the third parameter judgment result that is higher than the preset normal parameter range, and the fourth parameter judgment result that is within the preset normal parameter range, the steps S1-S3 are repeated to continuously detect and judge.

Further, the exhaust superheat SH is a difference between the exhaust temperature T1 and a saturation temperature value corresponding to the exhaust pressure P1.

Further, the preset time is 30 min.

The invention adopts the scheme, and has the beneficial effects that: the refrigerant quantity of the multi-split air-conditioning system is judged based on four parameters of the exhaust temperature T1, the exhaust pressure P1, the exhaust superheat SH and the compressor input side current value I, so that the multi-split air-conditioning system is more accurate and reliable, manual calculation and measurement are not needed, meanwhile, the refrigerant filling operation is correspondingly controlled according to the parameter judgment result, and the technical effects of automation and high accuracy are achieved.

Drawings

Fig. 1 is a schematic diagram illustrating a connection configuration of a multi-split system.

The system comprises an outdoor unit 1, a compressor 11, a gas-liquid separator 12, an indoor unit 2, a refrigerant filling device 3, a refrigerant tank 31 and a filling electromagnetic valve 32.

Detailed Description

To facilitate an understanding of the invention, the invention is described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.

In this embodiment, a detection control method for detecting the refrigerant quantity of a multi-split system based on exhaust side parameters is applied to the multi-split system shown in fig. 1, where the multi-split system of this embodiment includes an outdoor unit 1, a plurality of indoor units 2, and a refrigerant filling device 3, the outdoor unit 1 includes a compressor 11, a gas-liquid separator 12, a four-way valve, and an outdoor heat exchanger, the refrigerant filling device 3 includes a refrigerant tank 31 and a filling electromagnetic valve 32, and two ends of the filling electromagnetic valve 32 are respectively connected to an outlet of the refrigerant tank 31 and an inlet of the gas-liquid separator 12.

Further, the system comprises a discharge pressure sensor which is arranged at the outlet position of the compressor 11 and is used for monitoring and obtaining the discharge pressure P1 of the compressor 11, a discharge temperature sensor which is arranged at the outlet position of the compressor 11 and is used for monitoring and obtaining the discharge temperature T1 of the compressor 11, and an alternating current transformer which is arranged at the input side power supply of the compressor 11 and is used for monitoring the input side current value I of the compressor.

In the embodiment, each exhaust pressure has a saturation temperature value corresponding to the exhaust pressure in different refrigerant physical properties, and therefore, based on the saturation temperature value corresponding to the monitored exhaust pressure P1 and the exhaust temperature T1, the exhaust superheat SH is calculated according to the difference between the exhaust temperature T1 and the saturation temperature value.

Thus, based on 4 parameters of the exhaust temperature T1, the exhaust pressure P1, the exhaust superheat SH and the compressor input side current value I, whether the refrigerant quantity of the multi-split air-conditioning system is large or small is judged.

Specifically, the detection control method comprises the following steps:

step S1, after the outdoor unit 1 and all indoor units 2 of the multi-split air conditioner are started to operate for preset time, monitoring and acquiring the exhaust temperature T1, the exhaust pressure P1, the exhaust superheat SH and the compressor input side current value I of the multi-split air conditioner system, wherein the preset time of the embodiment is 30min, and monitoring parameters is performed after all indoor units 2 of the outdoor unit 1 are operated for 30min, so that the acquired parameters can reflect the operation condition of the multi-split air conditioner more accurately.

S2, comparing and judging the exhaust temperature T1, the exhaust pressure P1, the exhaust superheat SH and the current value I of the input side of the compressor which are monitored based on various preset normal parameter ranges corresponding to the current outdoor environment temperature T4, wherein threshold normal parameter ranges for comparing and judging four parameters are divided in advance according to different outdoor environment temperatures T4, and for convenience of explanation, reference can be made by combining the following tables:

the A \ B \ C \ D \ E \ F \ G values in the table are determined according to the maximum current value corresponding to the maximum frequency of the compressor 11 capable of running at the environment temperature, and different compressors 11 have different parameter values.

And S3, according to the judgment results of the parameters, if the judgment results of at least three parameters are higher than or lower than the preset normal parameter range, or the judgment results of two parameters are higher than or lower than the preset normal parameter range and the judgment results of the other two parameters are within the preset normal parameter range, judging that the refrigerant quantity is large or the refrigerant quantity is small, and repeating the steps S1-S3 under the judgment results of other parameters to continuously monitor and judge.

Further, the following conditions are included for the part of the parameter judgment results which are higher than the preset normal parameter range: 1) if the judgment result of the four parameters is higher than the preset normal parameter range, the serious refrigerant quantity is judged to be large. 2) And if the judgment results of the three parameters are higher than the preset normal parameter range and the judgment results of the other parameters are within the preset normal parameter range, judging that the serious refrigerant quantity is large. 3) And if the judgment results of the three parameters are higher than the preset normal parameter range and the judgment result of one parameter is lower than the preset normal parameter range, judging that the general refrigerant quantity is large. 4) And if the judgment results of the two parameters are higher than the preset normal parameter range and the judgment results of the other two parameters are within the preset normal parameter range, judging that the general refrigerant quantity is large. 5) If two judgment results of the parameters are higher than the preset normal parameter range and the other two judgment results of the parameters are lower than the preset normal parameter range, repeating the steps S1-S3 for continuous detection and judgment; 6) if the two judgment results of the parameters are higher than the preset normal parameter range, the judgment result of the third parameter is lower than the preset normal parameter range, and the judgment result of the fourth parameter is within the preset normal parameter range, repeating the steps S1-S3 for continuous detection and judgment; 7) if only one parameter is judged to be higher than the preset normal parameter range and the other three parameters are all in the preset normal parameter range, the steps S1-S3 are repeated for continuous detection and judgment.

Further, the following conditions are included for the part of the parameter judgment results which are lower than the preset normal parameter range: 1) if the judgment results of the four parameters are lower than the preset normal parameter range, judging that the serious refrigerant quantity is less; 2) if the judgment results of the three parameters are lower than the preset normal parameter range and the judgment results of the other parameters are within the preset normal parameter range, judging that the serious refrigerant quantity is small; 3) and if the judgment results of the three parameters are lower than the preset normal parameter range and the judgment result of one parameter is higher than the preset normal parameter range, judging that the general refrigerant quantity is small. 4) And if the judgment results of the two parameters are lower than the preset normal parameter range and the judgment results of the other two parameters are within the preset normal parameter range, judging that the general refrigerant quantity is small. 5) If two parameter judgment results are lower than the preset normal parameter range and the other two parameter judgment results are lower than the preset normal parameter range, repeating the steps S1-S3 for continuous detection and judgment; 6) if the two judgment results of the parameters are lower than the preset normal parameter range, the third judgment result is higher than the preset normal parameter range, and the fourth judgment result is within the preset normal parameter range, repeating the steps S1-S3 for continuous detection and judgment; 7) if only one parameter is judged to be lower than the preset normal parameter range and the other three parameters are all in the preset normal parameter range, the steps S1-S3 are repeated for continuous detection and judgment.

Further, if the four parameter judgment results are all within the preset normal parameter range, the refrigerant quantity is judged to be normal.

In this embodiment, when the refrigerant quantity of the multi-split air-conditioning system is insufficient, the refrigerant needs to be filled and replenished through the refrigerant filling device 3, specifically, when it is determined that the refrigerant quantity is serious, the refrigerant in the refrigerant tank 31 is filled into the multi-split air-conditioning system through the gas-liquid separator 12 by controlling the filling electromagnetic valve 32 between the refrigerant tank 31 and the gas-liquid separator 12 to be opened for 6min and then closed, and then the multi-split air-conditioning system continuously operates for a period of time, and then the steps S1-S3 are repeated to continuously perform monitoring and determination. When the general refrigerant quantity is determined to be small, the filling electromagnetic valve 32 between the refrigerant tank 31 and the gas-liquid separator 12 is controlled to be opened for 3min and then closed, so that the refrigerant in the refrigerant tank 31 is filled into the multi-split system through the gas-liquid separator 12, and then the multi-split system is continuously operated for a period of time, and the steps S1-S3 are repeated for monitoring and judging.

Further, during the refrigerant charging period, various parameters are monitored and judged in real time, wherein when the refrigerant quantity is determined to be large (including the situations of serious refrigerant quantity and general refrigerant quantity), the charging electromagnetic valve 32 is immediately closed, and the steps S1-S3 are repeated to monitor and judge after the multi-split air-conditioning system continuously operates for a period of time.

The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents to the embodiments of the invention without departing from the scope of the invention as set forth in the claims below. Therefore, equivalent changes made according to the spirit of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.