JP2003279175A5

JP2003279175A5 -

Info

Publication number: JP2003279175A5
Application number: JP2002080387A
Authority: JP
Filing date: 2002-03-22
Publication date: 2004-08-19
Anticipated expiration: 2022-03-22

Description

【００２３】
また、本発明の請求項１７に係る冷凍空調装置は、前記圧縮機の潤滑が確保される最低濃度を前記圧縮機のすべり軸受けによる潤滑部分における摩擦係数が固体接触の摩擦係数よりも小さい摩擦係数になるような濃度に設定するものである。
また、本発明の請求項１８に係る冷凍空調装置は、並列に接続された複数の圧縮機、凝縮器、減圧装置、蒸発器、アキュムレータを順次接続した冷凍サイクルからなる冷凍空調装置において、前記アキュムレータから前記圧縮機に供給される液冷媒中の冷凍機油の濃度を前記圧縮機のすべり軸受けによる潤滑部分における摩擦係数が固体接触の摩擦係数よりも小さい摩擦係数となる濃度にするように前記アキュムレータ内に存在する油量を設定するものである。 [0023]
In the refrigeration air-conditioning apparatus according to claim 17 of the present invention, the coefficient of friction at the lubrication portion of the compressor with a sliding bearing of the compressor is smaller than the coefficient of friction of solid contact. The concentration is set to
The refrigeration air conditioning system according to claim 18 of the present invention is a refrigeration air conditioning system comprising a refrigeration cycle in which a plurality of compressors connected in parallel, a condenser, a pressure reducing device, an evaporator, and an accumulator are sequentially connected. Inside the accumulator so that the concentration of refrigeration oil in the liquid refrigerant supplied from the compressor to the compressor is such that the coefficient of friction in the lubrication portion of the slide bearing of the compressor is smaller than the coefficient of friction in solid contact The amount of oil present in

【００７７】
本発明の請求項１７に係る冷凍空調装置は、前記圧縮機の潤滑が確保される最低濃度を前記圧縮機のすべり軸受けによる潤滑部分における摩擦係数が固体接触の摩擦係数よりも小さい摩擦係数になるような濃度に設定するので、軸受け部の発熱が小さいため潤滑性能を確保することができる。
また、本発明の請求項１８に係る冷凍空調装置は、並列に接続された複数の圧縮機、凝縮器、減圧装置、蒸発器、アキュムレータを順次接続した冷凍サイクルからなる冷凍空調装置において、前記アキュムレータから前記圧縮機に供給される液冷媒中の冷凍機油の濃度を前記圧縮機のすべり軸受けによる潤滑部分における摩擦係数が固体接触の摩擦係数よりも小さい摩擦係数となる濃度にするように前記アキュムレータ内に存在する油量を設定するので、液バックの状態が連続して発生した場合においても油濃度低下に伴う潤滑不良による圧縮機破損を回避することができる。 [0077]
The refrigeration air-conditioning apparatus according to claim 17 of the present invention is such that the coefficient of friction at the lubrication portion of the slide bearing of the compressor is smaller than the coefficient of friction of solid contact, as the lowest concentration at which the compressor is lubricated. Since the concentration is set to such a value, the heat generation of the bearing portion is small, so that the lubricating performance can be secured.
The refrigeration air conditioning system according to claim 18 of the present invention is a refrigeration air conditioning system comprising a refrigeration cycle in which a plurality of compressors connected in parallel, a condenser, a pressure reducing device, an evaporator, and an accumulator are sequentially connected. Inside the accumulator so that the concentration of refrigeration oil in the liquid refrigerant supplied from the compressor to the compressor is such that the coefficient of friction in the lubrication portion of the slide bearing of the compressor is smaller than the coefficient of friction in solid contact Since the amount of oil present in the above is set, it is possible to avoid damage to the compressor due to a lubrication failure caused by the decrease in oil concentration even when the liquid back state continuously occurs.

Claims

In a refrigeration air conditioning system comprising a refrigeration cycle in which a plurality of compressors connected in parallel, a condenser, a pressure reducing device, an evaporator and an accumulator are sequentially connected, an oil recovery circuit for recovering surplus refrigeration oil in the compressor to the accumulator A refrigeration air-conditioning system comprising: the accumulator for retaining the refrigeration oil circulating in the refrigeration cycle.

The refrigeration air conditioning system according to claim 1, wherein the oil recovery circuit is connected in communication with a predetermined oil level position of the compressor.

The operation control device is provided to stop the operation of the target compressor when performing an oil recovery operation for recovering the refrigeration oil in the compressor to the accumulator. Refrigeration air conditioner.

The refrigeration air conditioning system according to any one of claims 1 to 3, further comprising: an oil return circuit for supplying refrigeration oil in the accumulator to a compressor.

5. The refrigeration air conditioning system according to claim 4, wherein the oil return circuit is provided with a flow rate control device which makes the flow rate variable.

The operation control device is characterized in that the operation of the compressor is stopped, and the operation of increasing the flow rate of the oil return circuit is performed before performing the operation of recovering the refrigeration oil in the compressor to the accumulator. Refrigeration air conditioner as described.

The refrigeration air-conditioning apparatus according to any one of claims 3 to 6, wherein the operation control device performs an operation of recovering refrigeration oil in a compressor to the accumulator at predetermined time intervals.

8. The refrigeration air conditioning system according to claim 7, wherein the predetermined time is changed in accordance with the operating state of the refrigeration air conditioning system.

4. The method according to claim 3, wherein the operation control device detects that the amount of oil in the compressor is large and, in accordance with the detected amount of oil, performs an operation to recover refrigeration oil in the compressor to the accumulator. The refrigeration air conditioner according to any one of claims 6.

A refrigeration air conditioner comprising a refrigeration cycle in which a plurality of compressors connected in parallel, a condenser, a pressure reducing device, an evaporator, and an accumulator are sequentially connected, wherein the accumulator holds refrigeration oil for the compressor and the accumulator An oil return circuit for supplying the compressor oil with the refrigeration oil held therein; and an oil amount detection device for detecting the amount of oil in the compressor, the oil according to the detection result by the oil amount control device A refrigeration air conditioner characterized by comprising a flow control device for controlling the flow rate of a return circuit.

11. The refrigeration air conditioning system according to claim 10, wherein an oil regulator is provided as the oil amount detection system and the flow rate control system.

The freezer air conditioner according to claim 10, wherein a float switch is provided as the oil amount detection device.

As the oil amount detection device, an oil amount calculation device is provided which calculates the amount of oil held by the compressor from at least one of the compressor oil carry-out characteristic of the compressor, the compressor operating condition, and the compressor operating time. The refrigeration air conditioning system according to claim 10, wherein

An oil separator is provided between the compressor and the condenser, and an oil return circuit for returning the refrigeration oil separated by the oil separator to an accumulator is provided. Refrigerating air conditioner according to any one of 13.

An oil separator is provided at the discharge portion of each of the plurality of provided compressors, and an oil return circuit is provided for returning refrigeration oil separated by the oil separator to the suction portion of the compressor. The refrigeration air conditioning system according to any one of claims 1 to 13.

A refrigeration air conditioner comprising a refrigeration cycle in which a plurality of compressors connected in parallel, a condenser, a pressure reducing device, an evaporator, and an accumulator are sequentially connected, wherein the accumulator holds the refrigeration oil circulating in the refrigeration cycle, and The refrigeration oil is held in the accumulator such that the oil concentration when the liquid refrigerant fills and mixes in a space other than the portion in the accumulator where the refrigeration oil exists is equal to or higher than the minimum concentration at which the lubrication of the compressor is ensured. A refrigeration air conditioner characterized by

The lowest concentration at which the lubrication of the compressor is ensured is set to a concentration such that the coefficient of friction in the portion lubricated by the slide bearing of the compressor is a coefficient of friction smaller than that of solid contact. 16. The refrigerating air conditioner according to 16.

In a refrigeration air conditioning system comprising a refrigeration cycle in which a plurality of compressors connected in parallel, a condenser, a pressure reducing device, an evaporator, and an accumulator are sequentially connected, refrigerant oil in liquid refrigerant supplied from the accumulator to the compressor The refrigeration and air conditioning characterized in that the amount of oil present in the accumulator is set such that the concentration is such that the coefficient of friction in the lubrication portion of the slide bearing of the compressor is smaller than the coefficient of friction of solid contact. apparatus.