Reciprocating compressor and control method therefor
AssigneeHitachi Industrial Equipment Systems Co., Ltd.
InventorAkito Ohata
Life of this patent
Estimating the term…
Abstract
The purpose of the present invention is to provide a reciprocating compressor which is a compact, light-weight, portable air compressor such that deterioration of performance due to problems such as wear on the surface finish of the cylinder when the compressor is used for a long period of time outside the operating temperature range thereof is prevented. To achieve this, the cylinder temperature is detected, and control is carried out so that the compressor is restarted at a lower restart pressure when the temperature is lower than a prescribed value and stopped (and also restarted, preferably) at a low pressure when the temperature is higher than a prescribed value.
Claims15
A reciprocating compressor comprising:
- a compressor body in which a piston reciprocates in a cylinder to compress a fluid;
- a motor which drives the compressor body;
- a controller which controls the compressor body;
- a tank which stores the fluid compressed in the compressor body;
- and
- a temperature sensor attached to the reciprocating compressor,
- wherein the controller controls the compressor body to start the compressor body when a pressure of the fluid in the tank becomes equal to or lower than a start pressure, and stop the compressor body when the pressure of the fluid becomes equal to or higher than a stop pressure, and
- the controller sets, of at least one of the start pressure and the stop pressure, a pressure applied in a case where a measurement temperature of the temperature sensor is outside a predetermined temperature range to be lower than a pressure applied in a case where the measurement temperature of the temperature sensor is within the predetermined temperature range, and
- wherein, in a case in which the measurement temperature of the temperature sensor is less than a first predetermined value, the controller decreases only the start pressure of the compressor body, and, in a case in which the measurement temperature of the temperature sensor is greater than a second predetermined value, the controller decreases the start pressure and the stop pressure.
A control method for a reciprocating compressor comprising:
- driving a piston using a motor so as to cause the piston to reciprocate in a cylinder and compress a fluid;
- storing the compressed fluid in a tank;
- stopping the motor when a pressure of the compressed fluid stored in the tank becomes higher than a stop pressure set in advance;
- and
- starting the motor when the pressure of the compressed fluid stored in the tank becomes lower than a start pressure set in advance and storing the fluid compressed in the cylinder in the tank,
- wherein, in a case where a measurement temperature by a temperature sensor attached to the reciprocating compressor deviates from a temperature range set in advance, control of starting or stopping of the motor is carried out by decreasing at least one of the start pressure and the stop pressure, and
- wherein, in a case in which the measurement temperature of the temperature sensor is less than a first predetermined value, only the start pressure of the compressor body is decreased, and, in a case in which the measurement temperature of the temperature sensor is greater than a second predetermined value, the start pressure and the stop pressure are decreased.
Dependencies are inferred from the claim text.