Compound pressure and vacuum gage for displaying different measuring ranges by linear scales

Abstract

The invention discloses a compound pressure and vacuum gage for displaying different measuring ranges by linear scales. The lower part of a pressure gage shell is connected with a joint through a flange; an air passage is processed in the pressure gage shell; a vacuum deformation plate and a pressure deformation plate are stacked and then are fixedly arranged inside the pressure gage shell through a bolt; a closed air chamber is formed between the vacuum deformation plate and the pressure gage shell; the middle of the vacuum deformation plate is fixedly provided with a sleeve pipe used for mounting a pointer mechanism. When the compound pressure and vacuum gage works, when a vacuum exists in the air passage, the vacuum deformation plate makes the sleeve pipe to downwards move through the deformation of a vacuum deformation ring, and a pointer is dragged to anticlockwise deflect; when pressure exists in the air passage, the vacuum deformation plate compresses the pressure deformation plate for deformation, the sleeve pipe is enabled to upwards move, and the pointer is dragged to clockwise deflect; through a thickness difference between the vacuum deformation plate and the pressure deformation plate, deflection scales are enabled to be different. According to a pressure gage, the pointer is enabled to carry out inverse deflection through using the vacuum deformation plate and the pressure deformation plate; meanwhile, by utilizing the thickness difference between the vacuum deformation plate and the pressure deformation plate, the deflection scales are enabled to be different. A device is simple and reliable.

Description

technical field [0001] The invention relates to instruments and meters, in particular to a pressure vacuum gauge with a linear scale displaying different measuring ranges. Background technique [0002] At present, the pressure vacuum gauges on the market are all linear, and the vacuum degree or pressure is represented by the deformation of a deformed plate, which is reflected in the scale of the pressure vacuum gauge, which is symmetrical and uniform. However, in actual use Among them, when the negative pressure is 1 bar, it is close to vacuum, and the positive pressure to be measured by the pressure gauge is usually much greater than this. Therefore, the linear symmetrical pressure vacuum gauge is not very accurate when measuring negative pressure. [0003] A non-linear symmetrical pressure vacuum gauge mentioned in the present invention measures positive pressure and negative pressure respectively through the action of two pressure plates. When measuring negative pressure,...

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Problems solved by technology

[0002] At present, the pressure vacuum gauges on the market are all linear, and the vacuum degree or pressure is represented by the deformation of a deformed plate, which is reflected in the scale of the pressure vacuum gauge, which is symmetrical and uniform. However, in actual use Among them, when the negative pressure is 1 bar, it is close to vacuum, and the positive pressure to be measured by the pressure gauge is usually much greater than this, so the linear symmetrical pressure vacuum gauge is not very accurate when measuring negative pressure

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