Portable vacuum measuring device

Abstract

The invention relates to a portable vacuum measuring device which is provided with an absolute pressure transmitter and a digital display instrument. The portable vacuum measuring device comprises a shell, a carrying handle, a digital display instrument panel, a bend pipe connector, a diaphragm valve, a bellows and clamping type fast unloading connectors. The carrying handle is mounted on the topof the shell. The digital display instrument panel is mounted on the front of the shell. The digital display instrument is mounted on the digital display instrument panel. The bend pipe connector is mounted on the side panel of the shell by means of perforating. The absolute pressure transmitter and the bend pipe connector inside the shell are connected by one clamping type fast unloading connector. The diaphragm valve and the bend pipe connector outside the shell are connected by one clamping type fast unloading connector. The other end of the diaphragm valve is connected with the bellows through one clamping type fast unloading connector. The other end of the bellows is connected with a vacuum measurement cut-off valve on a vacuum vessel through one clamping type fast unloading connector. The portable vacuum measuring device has the advantages of accurate and reliable measurement data, simple structure, and the like.

Description

technical field [0001] The invention belongs to the technical field of vacuum measurement, in particular to a portable vacuum degree measurement device. Background technique [0002] In the application field of vacuum measurement technology, a common vacuum system consists of a vacuum container and a vacuum device composed of components such as vacuum generation, vacuum testing, and vacuum control. It mainly includes vacuum containers, vacuum pumps, absolute pressure transmitters, digital display instruments, connecting pipes, The absolute pressure transmitter is a key component of vacuum measurement, and its accuracy level and installation position are very important, which will directly affect The accuracy and reliability of the vacuum degree measurement data in the vacuum container. In the prior art, the absolute pressure transmitter is usually installed on the suction port or the suction pipe of the vacuum pump. The defects of these two installation positions are: 1. Th...

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Problems solved by technology

[0002] In the application field of vacuum measurement technology, a common vacuum system consists of a vacuum container and a vacuum device composed of components such as vacuum generation, vacuum testing, and vacuum control. It mainly includes vacuum containers, vacuum pumps, absolute pressure transmitters, digital display instruments, connecting pipes, The absolute pressure transmitter is a key component of vacuum measurement, and its accuracy level and installation position are very important, which will directly affect The accuracy and reliability of the vacuum degree measurement data in the vacuum container. In the prior art, the absolute pressure transmitter is usually installed on the suction port or the suction pipe of the vacuum pump. The defects of these two installation positions are: 1. The absolute pressure transmitter will be affected by the vibration and high temperature of the vacuum pump, and it is easily polluted by the vacuum pump oil

2. If there is oil, residual water vapor, impurities, harmful gases, etc. in the vacuum container, it will be pumped out by the vacuum pump, which will easily pollute or damage the absolute pressure transmitter

3. The connecting pipe for vacuum degree measurement is too long and too complicated, which will increase the error of the measurement system

Four. Digital display instrument is difficult to install reasonably

5. When calibration or verification is required, the absolute pressure transmitter and digital display instrument must be disassembled separately, which is very troublesome, and repeated disassembly, installation and handling will affect the performance of precision instruments

6. The real vacuum data in the vacuum container cannot be obtained accurately, especially when the internal structure of the vacuum container is relatively complex or the volume is relatively large, the vacuum measurement data in the suction pipe of the vacuum pump will be different from that of the vacuum container in a short period of time. There is a large error in the real vacuum data in the

Seven. Absolute pressure transmitters, digital display instruments and other components for measuring vacuum and controlling vacuum cannot be separated from the suction pipe of the vacuum system, and the vacuum degree cannot be detected at other measuring points of the vacuum container

[0003] In the prior art, another vacuum degree measuring instrument is a hand-held digital display vacuum gauge. Its main advantage is that it is small and exquisite, easy to carry, and is suitable for vacuum degree measurement with low precision requirements. However, its disadvantages are also obvious. Due to its accuracy Usually it can only reach ±10%, so it cannot be applied in a vacuum system that requires high-precision measurement (such as an accuracy class of 0.5)

[0004] The utility model patent with the publication number CN204154442U discloses a vacuum measurement device. This technology is an improvement for the thread connection problem of absolute pressure transmitters that do not meet the requirements of the vacuum technology field in various application fields. Clarify the measurement range, accuracy level and other functional characteristics of the improved absolute pressure transmitter, so it cannot be applied in a vacuum system with high-precision measurement requirements (such as an accuracy level of 0.5)

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