Fluid machine
AssigneeHitachi Industrial Equipment Systems Co., Ltd.
InventorsAkihiro Yamamoto, Yoshiyuki Kanemoto, Daichi Oka
Life of this patent
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Abstract
Even when abnormal heat generation occurs during operation in a state where the temperature of a compressor is not increased, abnormality cannot be detected. A fluid machine includes a fluid machine body; a motor that drives the fluid machine body; a temperature sensor that measures a temperature of the fluid machine body; and a control unit that controls the fluid machine body. The control unit changes a temperature threshold value based on at least one of a pressure of a fluid discharged by the fluid machine body and a frequency of a voltage input into the motor, and issues a notification when the temperature of the compressor body measured by the temperature sensor exceeds the temperature threshold value.
Claims9
A compressor comprising:
- a compressor body having a motor and a compression mechanism driven by the motor;
- a cooling fan that is disposed on the non-load side of the motor, and that cools the compression mechanism;
- a temperature sensor that measures a temperature of the compressor body;
- and
- a control unit that controls the compressor body, wherein the control unit
- issues a notification when the temperature measured by the temperature sensor exceeds a temperature threshold value, and
- changes the temperature threshold value of the temperature sensor to a second threshold value that is lower than the first threshold value in a region where the rotation speed of the cooling fan is high,
- increases the temperature threshold value when the pressure of the compressed gas discharged from the compressor body increases, and
- immediately increases the temperature threshold value when increasing the temperature threshold value, and decreases the temperature threshold value in a stepwise manner when decreasing the temperature threshold value.
Dependencies are inferred from the claim text.