Semi-automatic calibration device for floating ball type pressure gauge

Abstract

The utility model belongs to the technical field of pressure gauge verification, and discloses a semi-automatic calibration device for a floating ball type pressure gauge, which comprises the floating ball type pressure gauge, a gas path input end of the floating ball type pressure gauge is communicated with a gas source through a pressure reducing valve, a pressure output end of the floating ball type pressure gauge is connected with a standard device, a signal output end of the standard device is connected with an upper computer, and the upper computer is connected with the floating ball type pressure gauge. And the upper computer receives the pressure detection value of the standard device, compares the pressure detection value with a preset weight air pressure value corresponding to the floating ball pressure gauge, and outputs a comparison result. By utilizing the semi-automatic calibration device, paperless calibration can be realized, resources are saved, storage and subsequent query are facilitated, and popularization and application are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure gauge verification, in particular to a semi-automatic calibration device for a float-type pressure gauge. Background Art

[0002] A float-type pressure gauge uses a precision sphere placed at the nozzle opening of a cylindrical or conical nozzle. A weight rack and special weights act on the top of the sphere. Gas is sprayed onto the sphere through a flow regulator and a filter. The pressure inside the nozzle acts on the lower part of the sphere to make the sphere float in the nozzle. When the force acting on the floating ball by the gas is balanced with the gravity of the floating ball, the weight rack and the special weights, the float-type pressure gauge can output a stable and accurate pressure.

[0003] Currently, for the calibration of a float-type pressure gauge, according to the calibration detection points, first place the corresponding weights on the weight rack, then use a higher-grade standard device to measure the pressure output value of the float-type pressure gauge at this time, manually record it, and then perform comparative calibration and calculate the effective area of the corresponding floating ball to form a paper calibration report for storage. The process is very cumbersome, with low efficiency, and the paper archive is easily damaged, bringing inconvenience to both storage and retrieval. Summary of the Utility Model

[0004] The utility model provides a semi-automatic calibration device for a float-type pressure gauge, which solves the technical problems in the existing verification of float-type pressure gauges, such as mostly manual operation, cumbersome process, easy damage of paper archives, and inconvenience in storage and retrieval.

[0005] The utility model can be realized by the following technical solutions:

[0006] A semi-automatic calibration device for a float-type pressure gauge includes a float-type pressure gauge. The gas path input end of the float-type pressure gauge is connected to a gas source through a pressure reducing valve, and its pressure output end is connected to a standard device. The signal output end of the standard device is connected to a host computer. The host computer receives the pressure detection value of the standard device, compares it with the corresponding weight air pressure value of the pre-set float pressure gauge, and outputs the comparison result and the corresponding effective area of the floating ball.

[0007] Further, the standard device adopts a digital pressure gauge with a detection level higher than that of the float-type pressure gauge to be calibrated.

[0008] Further, multiple weight air pressure values are set according to the range of the float-type pressure gauge to be calibrated.

[0009] Further, the gas source stores gas in a steel cylinder.

[0010] The beneficial technical effects of the utility model are as follows:

[0011] The semi-automatic calibration device of the present utility model uses a digital pressure gauge to detect the pressure output value of a float-type pressure gauge, performs digital processing on it, and uploads it to the upper computer. The upper computer compares it with the corresponding weight pressure value set in advance, and the output comparison result is the calibration result. At the same time, the pressure detection value of the digital pressure gauge can be substituted into the calculation formula of the effective area of the float, and the effective area of the float can be automatically calculated, so as to realize semi-automatic pressure calibration. Compared with the pure manual operation of the existing calibration, a large amount of calculation is saved, the calibration time is shortened, the work efficiency is improved, the error rate caused by manual calculation is reduced, and at the same time, paperless calibration can be realized, saving resources, facilitating storage and subsequent query, and being convenient for popularization and application. Brief Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0013] Among them, 1 - float-type pressure gauge, 2 - pressure reducing valve, 3 - gas source, 4 - standard device, 5 - upper computer. Specific Embodiments

[0014] The following details the specific embodiments of the present utility model in conjunction with the drawings and preferred embodiments.

[0015] As Figure 1 shown, the present utility model provides a semi-automatic calibration device for a float-type pressure gauge, including a float-type pressure gauge 1. The gas path input end of the float-type pressure gauge 1 is connected to the gas source 3 through a pressure reducing valve 2, and its pressure output end is connected to a standard device 4. The signal output end of the standard device 4 is connected to an upper computer 5. The upper computer 5 receives the pressure detection value of the standard device 4 and compares it with the weight air pressure value corresponding to the pre-set float pressure gauge, and outputs a comparison result.

[0016] The standard device 4 should adopt a digital pressure gauge with a detection level higher than that of the float-type pressure gauge to be calibrated, which is convenient for automatic acquisition of pressure values.

[0017] The gas source 3 can store gas in a steel cylinder, and specifically can be determined according to the driving gas characteristics of the float-type pressure gauge.

[0018] The pressure reducing valve 2 can be used to adjust the output pressure of the gas in the steel cylinder to meet the required range of the gas supply pressure of the float-type pressure gauge.

[0019] Since the buoyancy generated by the gas acting on the floating ball of the floating ball pressure gauge 1 is the same as the gravity corresponding to the weights on the weight rack, the floating ball will adjust the supply pressure to the corresponding output pressure. That is to say, its pressure value can be marked by the mass of the weights. Therefore, the pressure value marked by the weights, namely the weight pressure value, can be known in advance. We can set it in the upper computer in advance, and its specific quantity and size can be set according to the range of the floating ball pressure gauge 1 to be calibrated. This is used as a comparison threshold and compared with the pressure value detected by the standard device 4. The comparison result is the calibration result, thus realizing pressure calibration.

[0020] According to the verification regulation of the floating ball pressure gauge, it is also necessary to calculate the effective area of the floating ball according to the following calculation formula of the effective area of the floating ball pressure gauge.

[0021]

[0022] Where:

[0023] A - The effective area of the floating ball pressure gauge, cm 2 .

[0024] m i - The mass of the weights and the weight rack added to the floating ball pressure gauge, kg.

[0025] β - The air buoyancy correction coefficient at the place of use, which can be obtained by referring to the appendix of the verification regulation of the floating ball pressure gauge.

[0026] g - The acceleration of gravity, m / s 2 .

[0027] The average effective area of the floating ball pressure gauge within the range is finally:

[0028]

[0029] Where n represents the number of detection points.

[0030] Therefore, by importing the above formula and relevant parameters such as the weight mass into the upper computer, the effective area of the floating ball of the floating ball pressure gauge can be automatically calculated at each detection point, and finally the average effective area of the floating ball pressure gauge within the range can be obtained, and an electronic version of the original measurement record can be generated, thus greatly improving the detection efficiency.

[0031] When calibrating with the semi - automatic calibration device of the present utility model, we can set the number of detection points according to the range of the float - type manometer. For example, it is evenly divided into 5 detection points. For the first detection point, first add the weights corresponding to the pressure to the weight rack. After the float reaches equilibrium, the digital manometer uploads the pressure detection value to the host computer. The host computer compares it with the corresponding weight pressure value, and the output comparison result is the calibration result of the first detection point. At the same time, the corresponding effective area of the float is automatically calculated according to the above formula. By analogy, the remaining detection points are calibrated one by one, and the corresponding effective area of the float and the average effective area are calculated to complete the semi - automatic calibration of the float - type manometer.

[0032] The semi - automatic calibration device of the present utility model uses a digital manometer to detect the pressure output value of the float - type manometer, digitizes it, and uploads it to the host computer. The host computer compares it with the pre - set corresponding weight pressure value, and the output comparison result is the calibration result. At the same time, the pressure detection value of the digital manometer can be substituted into the calculation formula of the effective area of the float to automatically calculate the effective area of the float, so as to realize the semi - automation of pressure calibration. Compared with the pure manual operation of the existing calibration, it saves a large amount of calculations, shortens the calibration time, improves work efficiency, reduces the error rate caused by manual calculation, and at the same time can realize paperless calibration, save resources, and is convenient for storage and subsequent query.

[0033] Although the specific implementation manners of the present utility model have been described above, those skilled in the art should understand that these are only examples. Without departing from the principle and essence of the present utility model, various changes or modifications can be made to these implementation manners. Therefore, the protection scope of the present utility model is defined by the appended claims.

Claims

1. A semi-automatic calibration device for a float pressure gauge, characterized in that: It includes a float pressure gauge, the air circuit input end of the float pressure gauge is connected to the air source through a pressure reducing valve, the pressure output end is connected to a standard device, the signal output end of the standard device is connected to a host computer, the host computer receives the pressure detection value of the standard device, compares it with the preset weight air pressure value corresponding to the float pressure gauge, and outputs the comparison result.

2. The semi-automatic calibration device for a float type pressure gauge according to claim 1, characterized in that: The standard device adopts a digital pressure gauge with a higher detection level than the float pressure gauge to be calibrated.

3. The semi-automatic calibration device for a float type pressure gauge according to claim 1, characterized in that: The weight air pressure value is set in multiples according to the measuring range of the float pressure gauge to be calibrated.

4. The semi-automatic calibration device for a float type pressure gauge according to claim 1, characterized in that: The gas source adopts a steel cylinder to store gas.

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