Pressure gauge calibration device

Abstract

The utility model provides a pressure gauge calibration device, which comprises a first piston cylinder, a standard pressure gauge and a pressure gauge to be measured, the first piston cylinder is provided with a sealed cavity, the sealed cavity is filled with a liquid medium or a gas medium, and the standard pressure gauge and the pressure gauge to be measured are communicated with the sealed cavity of the first piston cylinder and are connected in parallel. The balancing weight acts on a piston of the first piston cylinder, and the piston selectively reciprocates in the first piston cylinder under the action of the gravity of the balancing weight so as to increase or reduce the volume of the sealed cavity, so that the calibration of the pressure gauge to be measured at positive pressure or negative pressure is realized; calibration calibration of the negative pressure and the positive pressure of the pressure gauge is achieved through reciprocating motion of the piston, the blank of a traditional calibration method in the aspect of negative pressure calibration is filled up, and the diversified requirements for positive pressure calibration and negative pressure calibration of the pressure gauge in the fields of industrial production, scientific research experiments, environment monitoring and the like are comprehensively met.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure testing, and particularly relates to a pressure gauge calibration device. Background Art

[0002] Under the current technical background, as a core tool for measuring pressure, pressure gauges play a crucial role in many fields such as industrial production, scientific research experiments, and environmental monitoring. Ensuring the accuracy and reliability of the measurement results of pressure gauges is of great importance for maintaining high-standard product quality and implementing strict safety controls. There are various traditional pressure gauge calibration methods, including but not limited to using piston pressure gauges, liquid column pressure gauges, or other pressure sources for comparative calibration, etc. However, these methods often have the problem of limited calibration pressure range, unable to meet the calibration requirements of both positive and negative pressure gauges simultaneously, and may be significantly affected by external environmental factors, especially temperature changes.

[0003] In recent years, with the continuous progress of materials science, precision manufacturing technology, and automatic control technology, some automated calibration devices using advanced electronic control systems have emerged on the market. Nevertheless, these high-end technologies usually come with high costs.

[0004] The patent "A Piston Pressure Gauge with Adjustable Measurement Range" proposes a new design of a piston pressure gauge, which uses gravity weights to calibrate the pressure gauge. However, this patent solution lacks a pressurization design, resulting in a relatively small pressure calibration range and being unable to calibrate negative pressure gauges below 1 atmospheric pressure. This is a major limitation of the background art of this patent. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the technical problem in the prior art that the calibration requirements of both positive and negative pressure gauges cannot be met simultaneously.

[0006] To solve the above technical problem, the utility model provides a pressure gauge calibration device, which includes: a first piston cylinder having a sealed chamber filled with a liquid medium or a gas medium; a standard pressure gauge and a pressure gauge to be measured connected to the sealed chamber of the first piston cylinder in parallel; a counterweight acting on the piston of the first piston cylinder, under the action of the gravity of the counterweight, the piston can reciprocate in the first piston cylinder to increase or decrease the volume of the sealed chamber, so as to realize the calibration of the pressure gauge to be measured under positive or negative pressure.

[0007] Furthermore, a force increasing mechanism is connected to the piston of the first piston cylinder to increase the acting force brought by the counterweight, so as to realize a wider range of pressure calibration of the pressure gauge.

[0008] Further, the force increasing mechanism includes a second piston cylinder and a third piston cylinder, both of which have sealed chambers filled with a liquid medium or a gas medium; the sealed chamber of the third piston cylinder has two, and the two sealed chambers are located on both sides of its piston; the counterweight is connected to the piston of the second piston cylinder, and the sealed chamber of the second piston cylinder can be selectively connected to one of the sealed chambers of the third piston cylinder through a pipeline, and the acting area of the liquid / gas medium of the third piston cylinder on its piston is greater than the acting area of the liquid / gas medium of the second piston cylinder on its piston, and the piston of the third piston cylinder is rigidly connected to the piston of the first piston cylinder.

[0009] Further, it also includes an adjusting mechanism for adjusting the capacity of the liquid / gas medium in the pipeline, and by adjusting the capacity of the liquid / gas medium in the pipeline, the position of the piston in the piston cylinder is adjusted.

[0010] Further, the adjusting mechanism includes a first medium capacity adjusting cylinder, which has a sealed chamber filled with a liquid / gas medium, and the sealed chamber of the first medium capacity adjusting cylinder is communicated with the pipeline formed by the second piston cylinder and the third piston cylinder.

[0011] Further, the adjusting mechanism also includes a second medium capacity adjusting cylinder, which has a sealed chamber filled with a liquid / gas medium, and the sealed chamber of the second medium capacity adjusting cylinder is connected to the sealed chamber of the first piston cylinder through a pipeline.

[0012] Further, both the first and second medium capacity adjusting cylinders include adjusting handwheels rotatably connected to the pistons, and by rotating the adjusting handwheels, the capacity of the sealed chambers of the first and second medium capacity adjusting cylinders can be adjusted.

[0013] Further, the counterweight is a weight.

[0014] As can be seen from the above technical solutions, the beneficial effects of the present utility model are: through the reciprocating movement of the piston, the calibration and calibration of the negative pressure and positive pressure of the pressure gauge are realized, filling the blank in the negative pressure calibration of the traditional calibration method, and comprehensively meeting the diverse needs of the positive pressure and negative pressure calibration of the pressure gauge in the fields of industrial production, scientific research experiments, environmental monitoring, etc. Description of the Drawings

[0015] Figure 1 is the schematic diagram of the positive pressure gauge calibration and calibration device provided by this application.

[0016] Figure 2 is the schematic diagram of the negative pressure gauge calibration and calibration device provided by this application.

[0017] Figure 3 is the schematic diagram of the positive and negative pressure gauge calibration and calibration device provided by this application.

[0018] The description of the reference numerals in the drawings is as follows: 1. First piston cylinder; 2. Standard pressure gauge; 3. Pressure gauge to be measured; 4. Second piston cylinder; 5. Third piston cylinder; 6. First medium capacity adjustment cylinder; 7. Second medium capacity adjustment cylinder; 8. Counterweight; 9. Positive pressure inlet valve; 10. Positive pressure outlet valve; 11. Negative pressure inlet valve; 12. Negative pressure outlet valve. Detailed implementation manners

[0019] Typical implementation manners reflecting the features and advantages of the present utility model will be described in detail in the following description. It should be understood that the present utility model can have various changes in different implementation manners, all of which do not depart from the scope of the present utility model, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting the present utility model.

[0020] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application 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 thus cannot be understood as a limitation to the present application. 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 the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0021] In order to further illustrate the principle and structure of the present utility model, the preferred embodiments of the present utility model will be described in detail with reference to the drawings.

[0022] Please refer to Figures 1 to 3 , a pressure gauge calibration and calibration device provided for this embodiment, including a first piston cylinder 1, a second piston cylinder 4, a third piston cylinder 5, a pressure gauge to be measured 3, a standard pressure gauge 2 and a counterweight 8.

[0023] First piston cylinder 1: It has a sealed chamber, and the chamber can be selectively filled with a liquid medium or a gas medium. One end of the sealed chamber is connected to the standard pressure gauge 2 and the pressure gauge to be measured 3 through a pipeline, and the standard pressure gauge 2 and the pressure gauge to be measured 3 are installed in parallel so as to display the pressure values simultaneously for comparison.

[0024] Counterweight 8: It acts on the piston of the first piston cylinder 1, and due to gravity, the piston reciprocates within the first piston cylinder 1, thereby increasing or decreasing the volume of the sealed chamber, and further changing the medium pressure in the pipeline.

[0025] Force increasing mechanism:

[0026] It is composed of the second piston cylinder 4 and the third piston cylinder 5. The force increasing mechanism can increase the acting force brought by the counterweight 8, enabling a relatively small weight of the counterweight 8 to generate a large pressure change, thereby improving the calibration range and accuracy of the device.

[0027] Second piston cylinder 4: It has a sealed chamber, which is also filled with a liquid medium or a gas medium. The piston of the second piston cylinder 4 is directly connected to the counterweight 8. Due to the gravity of the counterweight 8, the piston of the second piston cylinder 4 moves within the cylinder.

[0028] Third piston cylinder 5: It has two sealed chambers, located on both sides of its piston respectively. One of the sealed chambers of the third piston cylinder 5 is connected to the sealed chamber of the second piston cylinder 4 through a pipeline, and the piston of the third piston cylinder 5 is rigidly connected to the piston of the first piston cylinder 1. Since the acting area of the liquid / gas medium of the third piston cylinder 5 on its piston is larger than the corresponding area of the second piston cylinder 4, the effect of force amplification is achieved.

[0029] The acting area of the liquid / gas medium of the third piston cylinder on its piston is matched with the acting areas of the liquid / gas media of the second piston cylinder and the first piston cylinder according to actual needs. In order to further amplify the force, for example, in this embodiment, the acting area of the liquid / gas medium of the third piston cylinder 5 on its piston can be set to more than twice the acting area of the liquid / gas medium of the second piston cylinder 4 on its piston, which can achieve the amplification of the gravity effect of the counterweight. Moreover, the acting area of the liquid / gas medium of the third piston cylinder on its piston can also be set to more than twice the acting area of the liquid / gas medium of the first piston cylinder 1 on its piston. In this way, through the gravity of the counterweight 8 and the amplification of two - stage piston cylinders, a large pressure change can be generated in the pipeline.

[0030] Furthermore, it further includes an adjusting mechanism, and the adjusting mechanism includes:

[0031] First medium capacity adjusting cylinder 6: It has a sealed chamber filled with a liquid / gas medium, and its sealed chamber is connected to the pipeline formed by the second piston cylinder 4 and the third piston cylinder 5. By adjusting the medium capacity in the first medium capacity adjusting cylinder 6, the distribution of the medium in the pipeline can be adjusted, thereby adjusting the piston positions of the second and third piston cylinders 5.

[0032] Second medium capacity adjustment cylinder 7: It has a sealed chamber filled with a liquid / gas medium, and its sealed chamber is connected to the sealed chamber of the first piston cylinder 1 through a pipeline. Similarly, by adjusting the medium capacity in the second medium capacity adjustment cylinder 7, the piston position of the first piston cylinder 1 can be adjusted.

[0033] Both the first and second medium capacity adjustment cylinders 7 include adjustment handwheels rotatably connected to the pistons. By rotating the adjustment handwheels to adjust the positions of the pistons in the first and second medium capacity adjustment cylinders 7, the medium capacity can be conveniently adjusted, thereby realizing fine adjustment of the medium pressure in the pipeline.

[0034] It also includes ball valves. Ball valves are provided on the pipeline connecting the second piston cylinder 4 and the third piston cylinder 5 and on the pipeline connecting the first piston cylinder 1 and the pressure gauge. The medium entering or flowing out of the pipeline is controlled by the ball valves.

[0035] The above-mentioned medium is preferably a liquid medium. Due to its incompressible property, the liquid medium can better transmit the pressure of the counterweight 8, making the calibration more accurate. In the liquid medium solution, by opening the corresponding ball valve, through the movement of the cylinder piston, the external liquid medium can be sucked into the pipeline and the cylinder body. Then, through the movement of the cylinder piston, the gas in the pipeline can be discharged. After the medium is filled, the valve is closed; subsequently, the piston positions of the first, second, and third piston cylinders 5 are adjusted by the adjustment handwheel.

[0036] Initially, the pressure gauge pipeline can be initially set to a standard atmospheric pressure by connecting the pipeline to the atmosphere. After setting, the standard pressure gauge 2 and the pressure gauge to be measured 3 are connected.

[0037] Calibration of positive pressure and negative pressure:

[0038] As Figure 1 shown, the sealed chamber of the second piston cylinder 4 is connected to the sealed chamber on the left side of the third piston cylinder 5 through a pipeline. The counterweight 8 is loaded onto the piston of the second piston cylinder 4. The gravity of the counterweight 8 is transmitted through the medium, which will cause the piston of the third piston cylinder 5 to move to the right. Since the piston of the third piston cylinder 5 is rigidly connected to the piston of the first piston cylinder 1, the piston of the third piston cylinder 5 moving to the right will drive the piston of the first piston cylinder 1 to move to the right, resulting in the total amount of medium in the pipeline connected to the pressure gauge remaining unchanged, the volume becoming smaller or having a tendency to become smaller, and the pressure inside the pipeline increasing. At this time, a positive pressure higher than one atmospheric pressure can be obtained, thereby realizing the positive pressure calibration of the pressure gauge.

[0039] As Figure 2As shown in the figure, the sealed chamber of the second piston cylinder 4 is connected to the sealed chamber on the right side of the third piston cylinder 5 through a pipeline. A counterweight 8 is loaded onto the piston of the second piston cylinder 4. The gravity of the counterweight 8 is transmitted through the medium, which will cause the piston of the third piston cylinder 5 to move to the left. Since the piston of the third piston cylinder 5 is rigidly connected to the piston of the first piston cylinder 1, the leftward movement of the piston of the third piston cylinder 5 will drive the piston of the first piston cylinder 1 to move to the left, resulting in the total amount of medium in the pipeline connected to the pressure gauge remaining unchanged while the volume becomes larger or has a tendency to become larger, and the pressure inside the pipeline decreases. At this time, a negative pressure lower than one atmosphere can be obtained, thus realizing the calibration of the negative pressure of the pressure gauge.

[0040] As Figure 3 shown in the figure, it further includes a positive pressure inlet valve 9, a positive pressure outlet valve 10, a negative pressure inlet valve 11 and a negative pressure outlet valve 12. The two sealed chambers on the left and right of the third piston cylinder 5 are connected to the sealed chamber of the second piston cylinder 4 through a pipeline in a parallel connection manner. The positive pressure inlet valve 9 and the negative pressure outlet valve 12 are arranged in parallel and are connected to the sealed chamber on the left side of the third piston cylinder 5 through a pipeline. The positive pressure inlet valve 9 is arranged on the branch pipe corresponding to the left sealed chamber. The negative pressure inlet valve 11 and the positive pressure outlet valve 10 are arranged in parallel and are connected to the sealed chamber on the right side of the third piston cylinder 5 through a pipeline. The negative pressure inlet valve 11 is arranged on the branch pipe corresponding to the right sealed chamber. The pressure gauge calibration device in this embodiment can realize the calibration of the positive pressure or negative pressure gauge through the on-off state of the valves. Closing the negative pressure inlet and outlet valves and opening the positive pressure inlet and outlet valves can realize the calibration of the positive pressure gauge. Closing the positive pressure inlet and outlet valves and opening the negative pressure inlet and outlet valves can realize the calibration of the negative pressure gauge.

[0041] Although the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be broadly construed within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A pressure gauge calibration device, characterized in that: It includes a first piston cylinder, which has a sealed chamber filled with liquid or gaseous medium; a standard pressure gauge and a pressure gauge to be tested connected to the sealed chamber of the first piston cylinder, and the standard pressure gauge and the pressure gauge to be tested are connected in parallel; a counterweight block acts on the piston of the first piston cylinder, and under the action of the gravity of the counterweight block, the piston can selectively move back and forth in the first piston cylinder to increase or decrease the volume of the sealed chamber, thereby realizing the calibration of the pressure gauge to be tested at positive pressure or negative pressure.

2. The pressure gauge calibration device according to claim 1, characterized in that: The piston of the first piston cylinder is connected to a force increasing mechanism to increase the force brought by the counterweight block, thereby achieving pressure calibration of a wider range of the pressure gauge.

3. The pressure gauge calibration device according to claim 2, characterized in that: The force amplification mechanism includes a second piston cylinder and a third piston cylinder, both of which have a sealed chamber filled with liquid medium or gas medium; the third piston cylinder has two sealed chambers, and the two sealed chambers are located on both sides of its piston; the counterweight block is connected to the piston of the second piston cylinder, and the sealed chamber of the second piston cylinder can be selectively connected to one of the sealed chamber pipelines of the third piston cylinder, the action area of ​​the liquid / gas medium of the third piston cylinder on its piston is greater than the action area of ​​the liquid / gas medium of the second piston cylinder on its piston, and the piston of the third piston cylinder is rigidly connected to the piston of the first piston cylinder.

4. The pressure gauge calibration device according to claim 3, characterized in that: It also includes an adjusting mechanism for adjusting the capacity of the liquid / gas medium in the pipeline, and the position of the piston in the piston cylinder is adjusted by adjusting the capacity of the liquid / gas medium in the pipeline.

5. The pressure gauge calibration device according to claim 4, characterized in that: The regulating mechanism comprises a first medium capacity regulating cylinder having a sealed chamber filled with liquid / gas medium, and the sealed chamber of the first medium capacity regulating cylinder is connected to a pipeline formed by the second piston cylinder and the third piston cylinder.

6. The pressure gauge calibration device according to claim 5, characterized in that: The regulating mechanism also includes a second medium capacity regulating cylinder, which has a sealed chamber filled with liquid / gas medium, and the sealed chamber of the second medium capacity regulating cylinder is connected to the sealed chamber pipeline of the first piston cylinder.

7. The pressure gauge calibration device according to claim 5 or 6, characterized in that: The first and second medium capacity adjustment cylinders both include an adjustment hand wheel rotatably connected to the piston, and the capacity of the sealed chambers of the first and second medium capacity adjustment cylinders can be adjusted by rotating the adjustment hand wheel.

8. The pressure gauge calibration device according to claim 3, characterized in that: The counterweight is a weight.

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