Construction and Working Principle of Diesel Generator Oil Pressure Gauge

The main function of an oil pressure gauge is to quickly detect changes in oil pressure and facilitate adjustment. Today, Guangxi generator manufacturer Dingbo Electric will explain the function, structure, and working principle of an oil pressure gauge, hoping to be helpful to everyone.

The function of the diesel generator oil pressure gauge is to monitor the oil pressure in the main oil passage of the unit. It has several types such as diaphragm type, tubular spring type, and electric heating type. The first two are direct acting, with high sensitivity for pressure measurement, but inconvenient for monitoring. Electric oil pressure gauge is an instrument for non electrical testing, electrical transmission, and mechanical display. It consists of an oil pressure sensor, an oil pressure gauge, and wires for information transmission. The oil pressure sensor is installed on the cylinder block of the diesel generator and connected to the main oil passage, while the oil pressure gauge is installed on the dashboard. The sensitivity of the electric oil pressure gauge is not high, but it is easy to monitor and the measured pressure value can meet the requirements. Therefore, electric oil pressure gauges are widely used in power machinery.

Close the power switch, and the heating coil in the sensor will heat the bimetallic strip. The bimetallic strip will bend outward after being heated, causing the contact pair to trip and cut off the circuit of the oil pressure gauge. The heating coil will interrupt the heating of the bimetallic strip. The bimetallic strip recovers after being cooled, the contact pair closes again, and the circuit of the oil pressure gauge is connected again. Afterwards, the circuit is intermittently open and closed.

When the circuit of the diesel generator oil pressure gauge is connected, the heating coil in the pressure gauge heats the bimetallic plate, and the bimetallic plate 4 bends after being heated. Its head hooks the lower end frame of pointer 1, causing the pointer to swing and indicate the oil pressure in the lubrication system of the diesel generator.

When the diesel generator is not yet running and the switch is closed, although the contact pair in the sensor opens and closes intermittently, due to its short closing time, the amount of current flowing through the pressure gauge is small, the heating amount is small, and the deformation of the bimetallic strip is also small, making it impossible to pull the pointer and swing it. At this point, the pointer points to zero.

After the diesel generator works, the oil pressure from the main oil duct is transmitted to the oil chamber of the sensor through the bolt joint, and the flat membrane is pressed to arch. The flat membrane is bent against the spring plate, the contact pair rises, and the bimetal plate is bent by mechanical force. Therefore, the heating coil needs to heat the bimetallic strip for a longer period of time before the contact pair can open and power off. Due to the longer closure time of the contact pair, the heating coil in the pressure gauge heats the bimetallic strip for a corresponding increase in time, and the degree of bending is also greater. At this point, the head of the bimetallic strip hooks onto the lower edge of the pointer, causing the pointer of the oil pressure gauge to swing. Due to the intermittent opening and closing of the contact pair, the pointer of the oil pressure gauge indicates a certain oil pressure position.

When the ambient temperature is 20 ℃± 5 ℃, the voltage is 14V, and the oil pressure is 0.2MPa, the error does not exceed 0.04MPa; When the oil pressure is 0.5MPa, the error does not exceed 0.1MP. The contact pair is made of silver cadmium alloy and has a service life of 1200-1500 hours. Therefore, when not observing the oil pressure gauge, the circuit should be turned off. Adjusting the gear is used to adjust the pressure of the contact pair, and adjusting the arm is used to adjust the relative position of the pointer and dial.

As a generator manufacturer in Guangxi, Dingbo Electric reminds everyone to pay attention to the use of oil sensors and pressure gauges, which should be used together. If you would like to get more information welcome to contact us via [email protected].