Pressure gauge

A pressure gauge, comprising:

• a housing, defined with an axial direction and a radial direction, and comprising internal space, an opening, and a through hole, wherein the opening communicates with the internal space along the axial direction, and the through hole communicates with the internal space along the radial direction;
• a base, accommodated in the internal space and comprising a first channel and a second channel, the first channel extends along the axial direction and faces the opening, and the second channel extends along the radial direction and faces the through hole, the second channel laterally communicates with the first channel, and the second channel is connected to and communicates with an assembly pipe that penetrates the through hole;
• an arched frame, covering the base along the axial direction, to jointly define an accommodating chamber;
• a pressure sensing unit, comprising a diaphragm and a connecting base, wherein the connecting base is positioned on the diaphragm, and the diaphragm is accommodated in the accommodating chamber and is sandwiched between the arched frame and the base;
• a gauge core unit, comprising a rotating shaft, a torsion spring, a spiral base, a pointer, and a gauge panel, wherein the gauge panel is disposed on a side, facing away from the base, of the arched frame, a first end of the rotating shaft is plugged into the connecting base, and a second end of the rotating shaft penetrates the gauge panel, the pointer is disposed at the second end of the rotating shaft for synchronous rotation with the rotating shaft, the torsion spring is sleeved on the rotating shaft, and the spiral base is positioned on the connecting base and abuts against the torsion spring;
• and
• a push rod, movably accommodated in the first channel, and driven by fluid from the assembly pipe to push against the pressure sensing unit,
• an oil seal, a back support ring, a sealing ring, and a plugging base, the plugging base is screw-locked on the first channel, the plugging base and an inner wall of the first channel jointly define assembly space, the sealing ring is located in the assembly space and is sandwiched between the plugging base and the inner wall of the first channel, the back support ring and the oil seal are located in the assembly space and abut against each other in the axial direction, and the push rod movably penetrates the back support ring, the oil seal, the sealing ring, and the plugging base;
• wherein the pressure sensing unit also comprises a force equalized plate, the force equalized plate is between the diaphragm and the push rod, when the push rod is approaching the pressure sensing unit, the push rod drives the force equalized plate to push against the diaphragm to deform, an accommodating hole is recessed on a side, facing the diaphragm, of the force equalized plate, and when the force equalized plate pushes against the diaphragm, the connecting base extends into the accommodating hole.