Fail safe electronic pressure switch for compressor motor
First Claim
1. A compressor comprising:
- a pump unit;
an electric motor for driving said pump unit; and
a switching circuit for stopping operation of said motor, said switching circuit receiving an electric signal from a pressure sensor, said electric signal being operable to stop operation of said compressor motor should a pressure signal be indicative of a pressure higher than a preset maximum.
1 Assignment
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Accused Products
Abstract
An electronic pressure sensor is incorporated into a discharge pressure portion of a compressor. If the pressure sensor indicates that the discharge pressure exceeds a maximum value, the operation of the compressor motor is stopped. The pressure sensor preferably sends an electronic signal to a microprocessor such that the pressure can be compared to a predetermined maximum value. The pressure sensor includes a transducer to change the sensed pressure to a voltage value. The microprocessor communicates with a first switch, which may be a triac switch, and which stops operation of the compressor motor should an undesirably high value be detected. In addition, a second switch communicates with a comparing circuit which ensures the voltage from the pressure sensor is between a minimum and maximum value. The purpose of the comparing circuit is to ensure proper operation of the pressure sensor and its associated circuit.
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Citations
7 Claims
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1. A compressor comprising:
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a pump unit;
an electric motor for driving said pump unit; and
a switching circuit for stopping operation of said motor, said switching circuit receiving an electric signal from a pressure sensor, said electric signal being operable to stop operation of said compressor motor should a pressure signal be indicative of a pressure higher than a preset maximum. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A compressor comprising:
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a pump unit;
an electric motor for driving said pump unit; and
a switching circuit for stopping operation of said motor, said switching circuit receiving an electric signal from a pressure sensor, said electric signal be operable to stop operation of said compressor motor should a pressure signal be indicative of a pressure higher than a preset maximum, said switching circuit including a first triac switch receiving a signal from a microprocessor, said microprocessor receiving said electric signal, said microprocessor comparing said electric signal to a maximum signal, said microprocessor sending a signal to open said triac switch should said electric signal be indicative of an unduly high pressure, and a comparing circuit being incorporated into said switching circuit, said comparing circuit comparing said electric signal to stop operation of said compressor motor if said electric signal is outside of one of said minimum and maximum voltages.
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Specification