Verification system of high-pressure gas pressure gauge

Abstract

The invention discloses a verification system for a high-pressure gas pressure gauge, and the system comprises a supercharging device which is provided with a gas source inlet communicated with an external gas source through a pipeline; a low-pressure gas inlet and a high-pressure gas inlet of the pressure controller are respectively communicated with a low-pressure gas outlet and a high-pressure gas inlet of the supercharging device through pipelines; a gas outlet of the pressure controller is communicated with a to-be-calibrated pressure gauge through a pipeline, and the pressure controller is used for mixing the high-pressure gas and the low-pressure gas entering the pressure controller and then outputting gas with preset pressure to the pressure gauge so as to calibrate the pressure gauge; air in a compression environment is compressed by the first piston and the second piston to generate a pressure gas source as high as 100 MPa, the pressure controller is used for realizing gas pressure from 0.1 MPa to 100 MPa, the reading precision of the standard gas is superior to + / -0.1%, and the pressure gas source is further used for metering of a gas pressure gauge.

Description

Technical Field

[0001] The invention belongs to the field of pressure gauge calibration, and in particular relates to a calibration system for a high-pressure gas pressure gauge. Background Art

[0002] At present, pointer pressure gauges are widely used in various industries to measure the gas pressure in pipelines or containers, and some of the measured pressures are as high as 50MPa. These pressure gauges need to be measured regularly according to regulations to ensure their accuracy and reliability. For gas pressure gauges below 25MPa, manual pressurization or automatic pressurization mode can be used to complete the measurement. At present, the working medium used for measuring gas pressure gauges above 25MPa is water, which has the following problems:

[0003] 1) When using the pressure measurement standard to measure the pressure gauge under test, the working medium of the pressure measurement standard should be consistent with the daily working medium of the pressure gauge to prevent mutual contamination between the two. However, when measuring the 25MPa to 60MPa range gas pressure gauge, due to the lack of the corresponding high-pressure gas standard pressure generating device, only the water medium pressure measurement standard can be used. Although the measurement standard is convenient and simple to pressurize, after the gas pressure gauge under test is measured, some water medium will remain inside the pressure gauge, which is difficult to clean and easy to cause copper pressure gauge to produce verdigris. When the pressure gauge is reinstalled into the system, the verdigris and moisture inside the pressure gauge are easy to enter the running equipment, causing blockage or pollution of the equipment; in extreme cases, when the high-speed airflow impacts the verdigris and other metal impurities, it is easy to generate sparks on the stainless steel pipeline, which is very easy to ignite the oxygen pipeline and cause safety accidents.

[0004] 2) If special cleaning agents such as carbon tetrachloride are used to clean the internal pipes of the pressure gauge under test, since the spring tube inside the pressure gauge is a single-end closed design, it is difficult to clean it out after water enters, and problems are likely to occur after the pressure gauge under test is reinstalled.

[0005] 3) In particular, some high-purity gas working media are measured by pressure gauges. It is absolutely not allowed to use other liquids as the measuring working media. In the worst case, the equipment in use will be contaminated and scrapped, and in the worst case, there will be explosions and other injuries and deaths.

[0006] Therefore, in the prior art, when the 25MPa to 100MPa range gas pressure gauge is regularly measured or calibrated, water is used as the working medium, which leads to safety hazards in the subsequent use of the pressure gauge. Summary of the invention

[0007] The purpose of the present invention is to provide a calibration system for a high-pressure gas pressure gauge to solve the problem that when a 25MPa to 100MPa range gas pressure gauge is regularly measured or calibrated, water is used as a working medium, which leads to potential safety hazards in the later use of the pressure gauge.

[0008] The present invention adopts the following technical solution: a calibration system for a high-pressure gas pressure gauge, comprising:

[0009] A booster device, the gas source inlet of which is connected to an external gas source through a pipeline;

[0010] A pressure controller, whose low-pressure gas inlet and high-pressure gas inlet are respectively connected to the low-pressure gas outlet and high-pressure gas inlet of the booster device through pipelines; whose gas outlet is connected to the pressure gauge to be calibrated through a pipeline, and is used to mix the high-pressure gas and the low-pressure gas entering the pressure controller and then output the gas of a predetermined pressure to the pressure gauge, thereby calibrating the pressure gauge;

[0011] The booster device includes:

[0012] The first cylinder body has a gas inlet and a gas outlet, and the gas inlet is connected to an external gas source;

[0013] The second cylinder has a gas inlet and a gas outlet, wherein the gas inlet is connected to the gas outlet of the first cylinder through a pipeline, and the gas outlet is connected to the high-pressure gas inlet of the pressure controller;

[0014] A reversing rod, one end of which extends into the first cylinder body and is fixedly connected to the first piston of the first cylinder body, and the other end of which extends into the second cylinder body and is fixedly connected to the second piston of the second cylinder body. A third piston is also fixedly connected to the middle part of the reversing rod. The third piston is used for reciprocating motion, thereby driving the first piston and the second piston to reciprocate, thereby compressing the gas back and forth between the first cylinder body and the second cylinder body to obtain high-pressure gas.

[0015] Furthermore, the boosting device further comprises:

[0016] The third cylinder body is located at the periphery of the third piston and has a first regulating port and a second regulating port. The first regulating port and the second regulating port are arranged opposite to each other and distributed on both sides of the third piston. The first regulating port is used to introduce gas into the third cylinder body, thereby pushing the third piston to move in the direction of the second regulating port; the second regulating port is used to introduce gas into the third cylinder body, thereby pushing the third piston to move in the direction of the first regulating port, thereby causing the third piston to reciprocate.

[0017] Furthermore, it also includes: a high-pressure gas storage tank, whose inlet is connected to the gas outlet of the second cylinder body, and whose outlet is connected to the high-pressure gas inlet of the pressure controller.

[0018] Furthermore, it also includes: a low-pressure gas storage tank, whose inlet is connected to the external gas source, and whose outlet is connected to the low-pressure gas inlet of the pressure controller.

[0019] The beneficial effects of the present invention are:

[0020] The present invention generates a pressure gas source of up to 100MPa by compressing the air in the environment through the first piston and the second piston, and realizes the standard gas with a gas pressure ranging from 0.1MPa to 100MPa and a reading accuracy better than ±0.1% through a pressure controller, and then is used for gas pressure gauge measurement;

[0021] The present invention sets a first regulating port and a second regulating port of the third cylinder body, so that the gas entering the third cylinder body drives the third piston to reciprocate, and then drives the first piston and the second piston to reciprocate through the reversing rod, so that the gas is compressed back and forth between the first cylinder body and the second cylinder body to obtain high-pressure gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the boosting device in the present invention.

[0024] Among them: 10, boosting device; 11, pressure controller; 12, first cylinder; 13, second cylinder; 14, reversing rod; 15, first piston; 16, second piston; 17, third cylinder; 18, third piston; 19, high-pressure gas storage tank; 20, low-pressure gas storage tank. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] The present invention discloses a calibration system for a high-pressure gas pressure gauge, such as Figure 1 As shown, it includes a boosting device 10 and a pressure controller 11.

[0028] The boosting device 10 has a gas source inlet, a low-pressure gas outlet, and a high-pressure gas outlet. The gas source inlet of the boosting device 10 is connected to an external gas source through a pipeline.

[0029] The pressure controller 11 has a low-pressure gas inlet, a high-pressure gas inlet, and a gas outlet; the low-pressure gas inlet of the pressure controller 11 is connected to the low-pressure gas outlet of the boosting device 10 through a pipeline; the high-pressure gas inlet of the pressure controller 11 is connected to the high-pressure gas outlet of the boosting device 10 through a pipeline; the gas outlet of the pressure controller 11 is connected to a pressure gauge to be calibrated through a pipeline, and the pressure controller 11 is used to mix the high-pressure gas and the low-pressure gas entering the pressure controller 11 and then output gas of a predetermined pressure to the pressure gauge, thereby calibrating the pressure gauge.

[0030] like Figure 2 As shown, the supercharging device 10 includes: a first cylinder body 12 , a second cylinder body 13 , and a reversing rod 14 .

[0031] The first cylinder 12 has a gas inlet and a gas outlet, and the gas inlet of the first cylinder 12 is connected to the external gas source; the second cylinder 13 has a gas inlet and a gas outlet, and the gas inlet of the second cylinder 13 is connected to the gas outlet of the first cylinder 12 through a pipeline, and the gas outlet of the second cylinder 13 is connected to the high-pressure gas inlet of the pressure controller 11.

[0032] One end of the reversing rod 14 extends into the first cylinder body 12 and is fixedly connected to the first piston 15 of the first cylinder body 12. The other end of the reversing rod 14 extends into the second cylinder body 13 and is fixedly connected to the second piston 16 of the second cylinder body 13. The middle part of the reversing rod 14 is also fixedly connected to the third piston 18. The third piston 18 is used for reciprocating motion, thereby driving the first piston 15 and the second piston 16 to reciprocate, so that the gas is compressed back and forth between the first cylinder body 12 and the second cylinder body 13 to obtain high-pressure gas.

[0033] Due to the lack of corresponding high-pressure gas source in the prior art, only water medium pressure measurement standards can be used. Although the measurement standard is convenient and simple to pressurize, some water medium will remain inside the pressure gauge after the gas pressure gauge is measured, which is difficult to clean and easy to produce verdigris on the copper pressure gauge. When the pressure gauge is reinstalled into the system, the verdigris or moisture inside the pressure gauge can easily enter the running equipment, causing blockage or pollution of the equipment; in extreme cases, when the high-speed airflow impacts metal impurities such as verdigris, it is easy to generate sparks by friction on the stainless steel pipeline, which is very easy to ignite the oxygen pipeline and cause safety accidents. Therefore, the present invention can generate a gas source of up to 100MPa, and then the pressure gauge can be calibrated and measured in a non-destructive state.

[0034] In one embodiment, the external gas source is divided into three paths, the first path enters the low-pressure gas storage tank 20, the second path enters the first cylinder 12, and then drives the first piston 15 to move to the right. When the gas entering the first cylinder 12 drives the first piston 15, the third path of the external gas source enters the third cylinder 17 through the first regulating port of the third cylinder 17 to drive the third piston 18 to move to the right, thereby causing the first piston 15, the second piston 16, and the third piston 18 to move to the right at the same time. At this time, the gas is pressed from the second cylinder 13 into the first cylinder 12. When the third piston 18 moves to the right, the gas enters the first cylinder 12. When the first piston 15, the second piston 16, and the third piston 18 move to the right to the limit, the external gas source of the third path enters the third cylinder 17 through the second regulating port of the third cylinder 17 to drive the third piston 18 to move to the left, thereby causing the first piston 15, the second piston 16, and the third piston 18 to move to the left at the same time. At this time, the gas is pressed from the first cylinder 12 into the second cylinder 13. When the first piston 15, the second piston 16, and the third piston 18 move to the left to the limit, they move to the right again, and the gas is repeatedly compressed to generate high-pressure gas.

[0035] There is no restriction on the input and output of the pressure controller 11, that is, how to calculate the output pressure of the pressure controller 11 based on the pressure of the input low-pressure gas and the pressure of the high-pressure gas, as long as the pressure of the output gas can be satisfied.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-pressure gas pressure gauge calibration system, characterized in that: include: A pressure boosting device (10), the gas source inlet of which is connected to an external gas source through a pipeline; A pressure controller (11), wherein the low-pressure gas inlet and the high-pressure gas inlet are respectively connected to the low-pressure gas outlet and the high-pressure gas inlet of the pressurizing device (10) through pipelines; and the gas outlet is connected to the pressure gauge to be calibrated through a pipeline, and is used to mix the high-pressure gas and the low-pressure gas entering the pressure controller (11) and then output gas of a predetermined pressure to the pressure gauge, thereby calibrating the pressure gauge; Wherein, the boosting device (10) comprises: The first cylinder (12) has a gas inlet and a gas outlet, wherein the gas inlet is connected to an external gas source; The second cylinder (13) has a gas inlet and a gas outlet, wherein the gas inlet is connected to the gas outlet of the first cylinder (12) through a pipeline, and the gas outlet is connected to the high-pressure gas inlet of the pressure controller (11); A reversing rod (14) has one end extending into the first cylinder (12) and fixedly connected to the first piston (15) of the first cylinder (12), and the other end extending into the second cylinder (13) and fixedly connected to the second piston (16) of the second cylinder (13). A third piston (18) is also fixedly connected to the middle of the reversing rod (14). The third piston (18) is used for reciprocating motion, thereby driving the first piston (15) and the second piston (16) to reciprocate, thereby causing gas to be compressed back and forth between the first cylinder (12) and the second cylinder (13) to obtain high-pressure gas.

2. A high pressure gas pressure gauge calibration system according to claim 1, characterized in that: The boosting device (10) further comprises: The third cylinder body (17) is located on the periphery of the third piston (18) and has a first regulating port and a second regulating port. The first regulating port and the second regulating port are arranged opposite to each other and are distributed on both sides of the third piston (18). The first regulating port is used to introduce gas into the third cylinder body (17) to push the third piston (18) to move in the direction of the second regulating port; the second regulating port is used to introduce gas into the third cylinder body (17) to push the third piston (18) to move in the direction of the first regulating port, thereby causing the third piston (18) to reciprocate.

3. A high pressure gas pressure gauge calibration system according to claim 1, characterized in that: Also includes: A high-pressure gas storage tank (19) has an inlet connected to the gas outlet of the second cylinder (13), and an outlet connected to the high-pressure gas inlet of the pressure controller (11).

4. A high-pressure gas pressure gauge calibration system according to claim 1, characterized in that: Also includes: The inlet of the low-pressure gas storage tank (20) is connected to an external gas source, and the outlet of the low-pressure gas storage tank (20) is connected to the low-pressure gas inlet of the pressure controller (11).

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