JPS62119430A - Abnormality detector for cooling medium pressure - Google Patents

Abstract

PURPOSE:To provide immediate detection of abnormality of an equipment employing a cooling medium, by inputting an output from a temperature sensor and that from a pressure sensor into differential amplifier once passed through a temperature conversion amplifier to compare the outputs with the upper and lower limit values. CONSTITUTION:The temperature of a cooling medium is measured with a temperature sensor and amplified with an amplifier 1 to be inputted into a differential amplifier 3. On the other hand, the pressure of cooling medium is measured with a pressure sensor while the value is translated into temperature with a temperature conversion amplifier 2 to be inputted into one of the differential amplifier 3. An output of the differential amplifier 3 is inputted into a higher- order comparator 4 and a lower-order comparator 5 and when the outputs exceed the upper and lower limit values, the output section 6 outputs an abnormal signal. This enables immediate detection of abnormality in a unit using the cooling medium. This apparatus also functions as measuring device by measuring outputs of both the amplifiers 1 and 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that converts the pressure of a cooling medium into temperature and compares it with the actually measured temperature of the cooling medium to detect whether or not there is an abnormality.

The present invention uses voltage from a temperature sensor/pressure sensor that is output as a change in voltage or current, and changes the temperature.
The voltage from the temperature sensor is input to the amplifier, and its output is input to the differential amplifier. The voltage from the pressure sensor is input to the temperature conversion amplifier, and its output is also input to the differential amplifier. The differential amplifier outputs the difference between the converted pressure value temperature and the measured temperature as a voltage value, and inputs the difference voltage value to the upper comparator and the lower comparator. The upper comparator outputs an upper limit abnormality signal when the differential voltage value exceeds the upper limit setting value, and the lower comparator outputs a lower limit abnormality signal when the differential voltage value is divided by the lower limit setting value.

The lower limit abnormality signal and the lower limit abnormality signal are input to the output section, and outputted from the output section as an abnormal signal.

The present invention will be described below in the first [! This will be explained according to the overall configuration diagram of I. The amplifier 1 is for amplifying the output voltage of the temperature sensor, and the voltage value v1 increases or decreases with changes in the temperature of the cooling medium. The temperature conversion amplifier 2 is for converting and amplifying the output voltage of the pressure sensor into temperature, and the voltage 1dlV2 increases or decreases depending on the change in the pressure of the cooling medium. Further, a differential amplifier 3 is provided to calculate the difference between the voltage value V1 and the voltage value v2 and output the voltage value (3), and the voltage value (3) increases or decreases depending on changes in pressure and temperature. The voltage [V3 is input to the upper comparator 4 and the lower comparison W5, and the upper comparator @4 outputs the upper limit abnormality signal S1 when the voltage value v3 exceeds the upper limit setting voltage value v4, and the lower comparator 5 outputs the upper limit abnormality signal S1 when the voltage value V3 exceeds the upper limit set voltage value v4. When the lower limit setting voltage [V5 is divided, a lower limit abnormality signal S2 is output. The output unit 6 inputs the upper limit abnormality signal Sl and the lower limit abnormality signal S2, and outputs both abnormal signals as abnormal signals.

Therefore, this device can immediately detect an abnormality in a device using a cooling medium, and can also be used as a measuring device by measuring the voltage value 1 and the voltage 1aV2.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall configuration diagram of a cooling medium abnormality detection device. l... Increase II+! 2...temperature conversion amplifier,
3...Differential amplifier, 4...Upper comparator, 5
...lower comparison il! , 6... Output section.

Claims (1)

[Claims] an amplifier that amplifies the voltage input from the temperature sensor; an amplifier that converts the voltage input from the pressure sensor into a value of temperature relative to pressure; and a differential amplifier that outputs the difference between the voltages output from the two amplifiers; An upper comparator that outputs an upper limit error signal when the detected difference voltage value output from the differential amplifier exceeds the upper limit set value, and a lower comparator that outputs a lower limit error signal when the detected difference voltage value falls below the lower limit set value. A coolant pressure abnormality detecting device comprising: a refrigerant pressure abnormality detection device; and an output section that outputs the upper limit abnormality and the lower limit abnormality as abnormality signals.