CN204439277U - A kind of pressure sensor calibrating device that is medium with graininess solid - Google Patents

Abstract

The utility model discloses a pressure sensor calibration device with granular solid as the medium, which comprises a cylindrical structure of a pressure transformation cylinder, a U-shaped cover sleeved on the top of the pressure transformation cylinder and a bottom cover arranged at the bottom of the pressure transformation cylinder. There is also a piston in the pressure transformer cylinder, the cavity between the piston and the U-shaped cover constitutes a pressure chamber, the cavity between the piston and the bottom cover constitutes a calibration chamber, and the gap between the piston and the pressure transformer cylinder and the U-shaped The seal ring is set between the cover and the pressure transformation cylinder; the center of the U-shaped cover is provided with a pressure hole and a detection hole where a standard pressure gauge or pressure sensor can be installed, and the pressure hole is connected to the hydraulic source through a pipeline. The bottom cover is fixedly connected with the cylinder wall of the pressure transformation cylinder, and the center of the bottom cover is provided with a calibration hole where the pressure sensor to be calibrated can be installed. The device has the advantages of simple operation, high testing accuracy and good versatility.

Description

A pressure sensor calibration device with granular solid as medium

technical field

The utility model relates to a sensor calibration device, in particular to a pressure sensor calibration device with granular solid as the medium.

Background technique

At present, in the pressure measurement of engineering practice and scientific research, pressure sensors are widely used. Pressure sensors are not only used for the measurement of fluid pressure, but also for the measurement of solid pressure, such as the measurement of earth pressure in the civil engineering and construction industries, and the pressure measurement of agricultural products such as grains in agriculture. The design idea and working principle of conventional pressure sensors are consistent with the measurement of fluid pressure, and the measurement of uniform pressure generated by fluid is accurate. However, the solid medium is granular in the mesoscopic and belongs to the discrete medium, so there is a certain error in the measurement of the solid pressure by the pressure sensor. For this reason, in addition to the hydraulic calibration of the pressure sensor before use, the pressure sensor should also be calibrated with the same medium as the solid medium to be measured. At present, strain gauge and vibrating wire pressure sensors are commonly used. The hydraulic calibration of such sensors is relatively easy to realize. There are relevant national and industry norms or standards, and manufacturers will also perform hydraulic calibration according to the norms or standards before the products leave the factory. However, there is no suitable device for the calibration of solid media. The existing calibration devices are relatively rough in design and are only used for some specific tests, and their versatility is not strong.

Contents of the invention

In order to solve the above technical problems, the utility model provides a pressure sensor calibration device using granular solids as the medium. The device is simple to operate, high in testing accuracy and good in versatility.

The technical solution adopted by the utility model is: a pressure sensor calibration device with granular solid as the medium, including a pressure-transforming cylinder with a cylindrical structure, a U-shaped cover set on the top of the pressure-transforming cylinder, and a pressure-transforming cylinder The bottom cover at the bottom is also provided with a piston in the pressure transformation cylinder, the cavity between the piston and the U-shaped cover forms a pressure chamber, the cavity between the piston and the bottom cover forms a calibration chamber, and the piston and the pressure transformation cylinder Between them, as well as between the U-shaped cover and the pressure transformer cylinder are sealed by setting a sealing ring; the center of the U-shaped cover is provided with a pressure hole and a detection hole that can be installed with a standard pressure gauge or pressure sensor, and the pressure hole passes through The pipeline is connected to the hydraulic source, the bottom cover is fixedly connected to the wall of the pressure transformer cylinder, and the center of the bottom cover is provided with a calibration hole for installing the pressure sensor to be calibrated, and the calibration hole is a cylindrical hole with an internal thread .

Further optimization, the inner diameter of the pressure variable cylinder is at least 2-3 times the diameter of the pressure sensor to be calibrated.

Further optimization, the height of the piston is not less than 0.5 times its diameter.

Further optimization, the sealing ring is embedded in the sealing groove provided on the side of the piston and the top end of the pressure transformation cylinder.

Compared with the prior art, the utility model has at least the following advantages and beneficial effects:

The pressure sensor calibration device provided by the utility model uses granular solids as the medium, has low requirements on the surrounding environment, has good versatility, is simple to operate, and has high testing accuracy; and the utility model has simple structure, easy manufacturing and low cost.

Description of drawings

Fig. 1 is a structural representation of the utility model.

[Description of main component symbols]

1: Transformer cylinder 2: U-shaped cover

3: Bottom cover 4: Piston

5: Pressure chamber 6: Calibration chamber

7: Calibration hole 8: Pressure hole

9: Detection hole.

Detailed ways

In order to make the content of the utility model more obvious and understandable, the utility model will be described in detail below in conjunction with specific embodiments.

As shown in the figure, a pressure sensor calibration device with granular solids as the medium includes a cylindrical structure of the pressure transformation cylinder 1, a U-shaped cover 2 sleeved on the top of the pressure transformation cylinder 1 and a bottom of the pressure transformation cylinder 1. The bottom cover 3, the pressure transformer 1 is also provided with a piston 4, the cavity between the piston 4 and the U-shaped cover 2 constitutes the pressure chamber 5, and the cavity between the piston 4 and the bottom cover 3 constitutes the calibration chamber 6, and between the piston 4 and the pressure transformation cylinder 1, and between the U-shaped cover 2 and the pressure transformation cylinder 1 are sealed by setting a sealing ring; the center of the U-shaped cover 2 is provided with a pressure hole 8 and can be installed The detection hole 9 of the standard pressure gauge or pressure sensor, the pressurization hole 8 is connected with the hydraulic pressure source through the pipeline, the bottom cover 3 is fixedly connected with the cylinder wall of the pressure transformation cylinder 1, and the center position of the bottom cover 3 is provided with a movable The calibration hole 7 of the pressure sensor to be calibrated is installed, and the calibration hole 7 is a cylindrical hole with an internal thread.

In order to make the utility model have a better use effect, the inner diameter of the pressure changing cylinder 1 is at least 2-3 times of the diameter of the pressure sensor to be calibrated. The height of the piston 4 is not less than 0.5 times its diameter. The sealing ring is embedded in the sealing groove provided on the side of the piston 4 and the top end of the pressure transformation cylinder 1 .

In this technical solution, the sealing ring on the side of the piston 4 can be set to one, or two or more. The bottom of the cylinder wall of the transformer cylinder 1 is provided with a screw hole consistent with the length direction of the pressure transformer cylinder 1, and a through hole is provided on the bottom cover 3 corresponding to the screw hole, and the pressure transformer cylinder 1 and the bottom cover 3 are fixed by bolts Connection, threaded connection between pressure transformer cylinder 1 and U-shaped cover 2.

This embodiment is a calibration of a small pressure sensor with a diameter of 20 mm, wherein the pressure transformer 1 has an inner diameter of 60 mm, an outer diameter of 100 mm, and a height of 80 mm; the piston 4 is a solid cylinder with a diameter of 60 mm and a height of 30 mm. the seal groove. The U-shaped cover 2 has a thickness of 15mm, a total height of 60mm, an inner diameter of 100mm, and an outer diameter of 130mm. The bottom cover 3 is a circular plate with a diameter of 100mm and a thickness of 20mm.

The usage method of the present utility model: first connect the pressure hole 8 on the U-shaped cover 2 with the hydraulic source through the pipeline, then add water to the pressure chamber 5 from the hydraulic source, and after the water overflows in the detection hole 9, after the detection A standard pressure gauge or a pressure sensor is installed in the hole 9 in a sealed manner. After the installation is completed, turn the calibration device upside down, and fill the calibration chamber 6 with solid particles, such as coal powder, sand, etc., until it is full. After filling, the pressure sensor to be calibrated is installed in the calibration hole 7, and then the bottom cover 3 is fixedly connected by bolts. After the installation is completed, first pressurize the pressure chamber 5 through the hydraulic source, push the piston 4 to press the solid medium, stop pressurizing and remove the pressure when the pressure sensor to be calibrated starts to change the reading, and let it stand for 5 minutes to complete the solid medium. preload operation. Then pressurize the pressure chamber 5 step by step to complete the calibration of the pressure sensor to be calibrated.

The technical solutions and implementations listed in the utility model are not limiting, and the solutions that are equivalent to or have the same effect as the technical solutions and implementations listed in the utility model are all within the protection scope of the utility model.

Claims (4)

1. the pressure sensor calibrating device that is medium with graininess solid, it is characterized in that: the transformation cylinder (1) comprising tubular structure, be set in the U-shaped lid (2) at transformation cylinder (1) top and be arranged on the bottom (3) of transformation cylinder (1) bottom, piston (4) is also provided with in described transformation cylinder (1), cavity between piston (4) and U-shaped lid (2) forms pressure chamber (5), cavity between piston (4) and bottom (3) is formed demarcates chamber (6), and between piston (4) and transformation cylinder (1), and all seal by arranging O-ring seal between U-shaped lid (2) and transformation cylinder (1), the center of described U-shaped lid (2) is provided with pressurization hole (8) and can the detect aperture (9) of installation code tensimeter or pressure transducer, pressurization hole (8) is connected with hydraulic power source by pipeline, described bottom (3) is fixedly connected with the barrel of transformation cylinder (1), and the center of bottom (3) is provided with the demarcation hole (7) can installing pressure transducer to be calibrated, demarcate hole (7) for the female cylindrical hole of band.

2. a kind of pressure sensor calibrating device that is medium with graininess solid as claimed in claim 1, is characterized in that: the internal diameter of described transformation cylinder (1) is at least the 2-3 of pressure transducer diameter to be calibrated doubly.

3. a kind of pressure sensor calibrating device that is medium with graininess solid as claimed in claim 1, is characterized in that: the height of described piston (4) is not less than 0.5 times of its diameter.

4. a kind of pressure sensor calibrating device that is medium with graininess solid as claimed in claim 1, is characterized in that: described O-ring seal is embedded in the seal groove that arranges in piston (4) side and transformation cylinder (1) top.