JPWO2022180820A5

JPWO2022180820A5 -

Info

Publication number: JPWO2022180820A5
Application number: JP2023501981A
Authority: JP
Filing date: 2021-02-26
Publication date: 2023-11-02

Description

制御装置１００は、このような冷凍機油が基準量よりも不足しているか否かの判定と、その判定結果に応じて通常運転モードと回収運転モードとのいずれかで空気調和装置１０を運転する制御とを実行するために、図４に示すような運転制御プログラムを実行する。 The control device 100 determines whether or not the amount of refrigerating machine oil is less than the reference amount, and operates the air conditioner 10 in either the normal operation mode or the recovery operation mode depending on the determination result. In order to execute the control, an operation control program as shown in FIG. 4 is executed.

ステップＳ１４において“ＮＯ”と判定した場合は、ステップＳ１５において、通常運転モードでの空気調和装置１０の運転を実行し、リターンする。一方、ステップＳ１４において“ＹＥＳ”と判定した場合は、ステップＳ１６において、油回収運転モードでの空気調和装置１０の運転を実行し、リターンする。ステップＳ１６で実行する油回収運転モードは、前述のステップＳ７で実行する油回収運転モードと同様の運転モードである。 If the determination is "NO" in step S14, the air conditioner 10 is operated in the normal operation mode in step S15, and the process returns. On the other hand, if the determination is "YES" in step S14 , the air conditioner 10 is operated in the oil recovery mode in step S16, and the process returns. The oil recovery operation mode executed in step S16 is the same operation mode as the oil recovery operation mode executed in step S7 described above.

制御装置１００は、ステップＳ２２において、ステップＳ２１で取得した検出値のうち、運転周波数Ｆ、吸入温度Ｔs、吐出温度Ｔd、凝縮温度ＣＴ、出口温度Ｔco、および、“Ｔao－Ｔai”のそれぞれの検出値の基準時間内での平均値を算出する。次に、制御装置１００は、ステップＳ２３において、ステップＳ２２で算出した運転周波数Ｆ、吸入温度Ｔs、凝縮温度ＣＴ、および、“Ｔao－Ｔai”のそれぞれの平均値と、ステップＳ２１で取得した検出値に基づく運転周波数Ｆ、吸入温度Ｔs、凝縮温度ＣＴ、および、“Ｔao－Ｔai”の値とを比較し、運転周波数Ｆ、吸入温度Ｔs、凝縮温度ＣＴ、および、“Ｔao－Ｔai”のそれぞれの値について、対応する平均値との差が、定数“α２”よりも小さいか否かを判定する。定数“α２”は、“０”に近い極小値である。つまり、ステップＳ２３では、検出値に基づく運転周波数Ｆ、吸入温度Ｔs、凝縮温度ＣＴ、および、“Ｔao－Ｔai”のそれぞれの値について、対応する平均値との差が十分に小さいか否かを判定する。 In step S22, the control device 100 determines each of the operating frequency F, suction temperature Ts, discharge temperature Td, condensing temperature CT, outlet temperature Tco, and "Tao-Tai" among the detected values acquired in step S21 . Calculate the average value of the detected values within the reference time. Next, in step S23, the control device 100 calculates the average values of the operating frequency F, suction temperature Ts, condensing temperature CT, and "Tao-Tai" calculated in step S22, and the detected value obtained in step S21. The values of operating frequency F, suction temperature Ts, condensing temperature CT, and "Tao-Tai" based on It is determined whether the difference between the value and the corresponding average value is smaller than a constant "α2". The constant "α2" is a minimum value close to "0". That is, in step S23, it is determined whether or not the difference from the corresponding average value is sufficiently small for each value of the operating frequency F, suction temperature Ts, condensing temperature CT, and "Tao-Tai" based on the detected values. judge.

ステップＳ２４において“ＮＯ”と判定した場合は、ステップＳ２５において、通常運転モードでの空気調和装置１０の運転を実行し、リターンする。一方、ステップＳ２４において“ＹＥＳ”と判定した場合は、ステップＳ２６において、油回収運転モードでの空気調和装置１０の運転を実行し、リターンする。ステップＳ２６で実行する油回収運転モードは、前述のステップＳ７で実行する通常運転モードと同様の運転モードである。 If the determination is "NO" in step S24, the air conditioner 10 is operated in the normal operation mode in step S25, and the process returns. On the other hand, if the determination is "YES" in step S24 , the air conditioner 10 is operated in the oil recovery mode in step S26, and the process returns. The oil recovery operation mode executed in step S26 is the same operation mode as the normal operation mode executed in step S7 described above.

より好ましくは、判定値は、圧縮機１と減圧装置３との間の一部区間における圧力損失による圧力差ΔＰの検出値である。このような構成とすれば、圧縮機１と減圧装置３との間の一部区間における圧力差ΔＰと、圧縮機１の体積効率の低下との間に関連性があるので、圧縮機１において冷凍機油が基準量よりも不足している状態を正確に判定できるようになる。 More preferably, the determination value is a detected value of a pressure difference ΔP due to pressure loss in a partial section between the compressor 1 and the pressure reducing device 3. With such a configuration, there is a relationship between the pressure difference ΔP in a partial section between the compressor 1 and the pressure reducing device 3 and a decrease in the volumetric efficiency of the compressor 1. It becomes possible to accurately determine a state in which refrigerating machine oil is insufficient than a reference amount.

より好ましくは、制御装置１００は、圧縮機１の運転周波数Ｆの検出値、圧縮機１における冷媒の吸入温度Ｔsの検出値、および、圧縮機１と減圧装置３との間の一部区間における圧力損失の検出値に基づいて得られる圧力差ΔＰに基づいて、閾値を得る。このような構成とすれば、閾値が現実の運転状態を考慮した値となるので、圧縮機１において冷凍機油が基準量よりも不足しているか否かの判定結果の正確性を向上させることができる。 More preferably, the control device 100 controls the detected value of the operating frequency F of the compressor 1, the detected value of the refrigerant suction temperature Ts in the compressor 1, and the detected value of the refrigerant suction temperature Ts in the compressor 1, and the A threshold value is obtained based on the pressure difference ΔP obtained based on the detected value of pressure loss. With this configuration, the threshold value is a value that takes into account the actual operating state, so it is possible to improve the accuracy of the determination result of whether or not the refrigerating machine oil in the compressor 1 is insufficient compared to the reference amount. can.

Claims

a refrigerant circuit that includes a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a pressure reducing device and circulates refrigerant;
a plurality of sensors that detect the state of the refrigerant circuit;
and a control device that controls the refrigerant circuit based on the detection results of the plurality of sensors,
The control device compares a judgment value obtained based on the detection value of the sensor selected from the plurality of sensors with a threshold value that changes based on the detection value of the sensor selected from the plurality of sensors, and performs a comparison. An air conditioner that determines whether a reference amount of refrigerating machine oil is stored inside the compressor based on the result.

The judgment value is a temperature difference obtained based on a detected value of the air intake temperature in the indoor heat exchanger and a detected value of the air blowing temperature in the indoor heat exchanger. Air conditioner.

The air conditioner according to claim 1, wherein the determination value is a discharge temperature obtained based on a detected value of a discharge temperature of refrigerant in the compressor.

The air conditioner according to claim 1, wherein the determination value is a detected value of the outlet temperature of the refrigerant in the indoor heat exchanger.

The air conditioner according to claim 1, wherein the determination value is a detected value of a pressure difference due to pressure loss in a partial section between the compressor and the pressure reducing device.

The control device is configured to control a detected value of the operating frequency of the compressor, a detected value of the suction temperature of the refrigerant in the compressor, a detected value of the discharge temperature of the refrigerant in the compressor, and a detected value of the condensation temperature of the refrigerant in the indoor heat exchanger. The air conditioner according to claim 2, wherein the threshold value is obtained based on a detected value, a detected value of the refrigerant outlet temperature in the indoor heat exchanger, and a detected value of the air blowing temperature in the indoor heat exchanger. .

The air conditioner according to claim 3, wherein the control device obtains the threshold value based on an average value of discharge temperatures obtained from detected values of discharge temperatures of refrigerant in the compressor.

The air conditioner according to claim 4, wherein the control device obtains the threshold value based on an average value of outlet temperatures obtained from detected values of outlet temperatures of refrigerant in the indoor heat exchanger.

The control device uses a detected value of the operating frequency of the compressor, a detected value of the refrigerant suction temperature in the compressor, and a detected value of the pressure loss in a partial section between the compressor and the pressure reducing device. The air conditioner according to claim 5, wherein the threshold value is obtained based on a pressure difference obtained based on the pressure difference.

When the control device determines that the reference amount of refrigeration oil is not stored, the control device controls the compressor to operate in a recovery operation mode for recovering refrigeration oil that has leaked from the compressor into the refrigerant circuit. , the air conditioner according to any one of claims 1 to 9.