Pressure gauge

Abstract

The invention relates to a pressure gauge. The pressure gauge comprises a gauge case, a dial, pointers and a switching structure, wherein an introduction hole is formed in the bottom of the gauge case. The pressure gauge is characterized in that the switching structure comprises a transmission rod, a transmission base and a supporting spring, the transmission rod is axially restrained in the gauge case and can rotate around the axis of the transmission rod, external transmission threads are arranged on the transmission rod, and the pointers are fixed to the upper end of the transmission rod; the transmission base is arranged in the gauge case and can move vertically, the transmission base can move upwards under the driving of air pressure, a guiding hole is formed in the transmission base, the transmission rod is arranged in the guiding hole in a penetrating mode, and the hole wall of the guiding hole is provided with internal transmission threads matched with the external transmission threads; the supporting spring acts on the transmission base so that the transmission base can keep the tendency of moving downwards. The switching structure in the pressure gauge is simple and reasonable and good in transmission stability because of thread fit transmission, the pressure gauge is good in anti-shock effect, no complicated lever structure or gear structure is needed, and therefore the pressure gauge can be manufactured to be very small, all the parts are simple in structure, the cooperative relation between the parts is little, and cost is greatly reduced.

Description

technical field [0001] The invention relates to a pressure gauge for detecting air pressure. Background technique [0002] The working principle of the pressure gauge is through the elastic deformation of the sensitive components (Bourdon tube, diaphragm box, bellows) in the gauge, and then the conversion mechanism of the movement in the gauge transmits the pressure deformation to the pointer, causing the pointer to rotate to display the pressure. Spring tubes (Bourdon tubes) are divided into type tubes, coil spring tubes, spiral tubes and other types. Generally, cold hardening material blank tubes are used, which have high plasticity in the annealed state. After pressure processing, cold hardening and qualitative treatment Get high elasticity and strength. Under the pressure of the inner chamber, the spring tube can conveniently transform the pressure into elastic displacement of the free end of the spring tube by utilizing its elastic characteristics. The measurement ran...

AI Technical Summary

Problems solved by technology

[0006] Due to the complex structure of the transmission part of the existing pressure gauge structure, the volume of the pressure gauge is large, and the requirements for materials and manufacturing precision are high, resulting in high cost, and the anti-seismic effect of the lever or gear transmission structure is extremely poor. The lever or gear transmission part of the pressure gauge will be damaged if it falls on the bottom surface

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