Absolute pressure measurement piston gauge and piston rotation driving device thereof

Abstract

The invention discloses a piston rotation driving device for an absolute pressure measurement piston gauge, which is used for being embedded into a piston reference end of the piston gauge and drivinga piston to rotate synchronously. The piston rotation driving device comprises a main body and a piston rod shifting mechanism, wherein a piston reference end vacuum cavity is formed in the main body; the piston rod shifting mechanism is arranged in a vacuum cavity of the piston reference end, and the piston rod shifting mechanism at least comprises a slave synchronous pulley and a shifting forkconnected with the slave synchronous pulley, wherein the slave synchronous pulley is connected with a main synchronous pulley of the driving device for the absolute pressure piston gauge through a synchronous belt, the piston rod shifting mechanism can freely rotate in the main body under the linkage of the main synchronous pulley and the auxiliary synchronous pulley, and the piston is shifted torotate through the shifting fork. The invention further discloses an absolute pressure piston gauge. According to the absolute pressure measurement piston gauge and the piston rotation driving devicethereof in the invention, the overlarge torque is effectively prevented from damaging the piston and the piston cylinder, and the vacuum pumping efficiency and the working reliability of the absolutepressure measurement piston gauge are realized.

Description

technical field [0001] The invention relates to the field of nuclear power measurement, in particular to a piston-type manometer for absolute pressure measurement and a piston rotation driving device thereof. Background technique [0002] The piston pressure gauge for absolute pressure measurement in the prior art mainly has the following two ways to drive the piston to rotate. One is to directly install the DC motor in the vacuum chamber, and the DC motor directly drives the piston drive mechanism to move the piston. Rotation; one is that the DC motor extends the motor shaft into the vacuum chamber through the shaft seal, and drives the piston driving mechanism to move the piston to rotate. Due to the unreasonable structural design of the above-mentioned absolute pressure piston pressure gauge, there are mainly the following technical problems: [0003] 1. In the way that the DC motor is placed in the vacuum chamber to drive the piston to rotate, due to the structure of th...

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Problems solved by technology

[0003] 1. In the way that the DC motor is placed in the vacuum chamber to drive the piston to rotate, due to the structure of the DC motor, it takes a long time for the gas inside the DC motor to be pumped out. It takes a long time to establish a high vacuum in the vacuum chamber. The vacuum pump works for a long time, which greatly reduces the efficiency of the absolute pressure measurement of the piston pressure gauge;

[0004] 2. The motor shaft is extended into the vacuum cavity through the shaft seal, and the piston driving mechanism is driven to rotate the piston. Since the shaft seal is a dynamic seal, the seal is easy to wear and the sealing effect decreases as the use time increases. It can even lead to complete failure of the shaft seal and the inability to establish a vacuum in the vacuum chamber at the reference end of the piston

The above two methods also directly apply the output torque of the DC motor to the piston. When the piston cannot rotate well due to various reasons and needs to be cleaned, the large torque of the DC motor may damage the piston, making the piston of the piston gauge Rod and piston cylinder scrapped

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