A platform for self-checking of air separation equipment pressure gauges

Abstract

This utility model discloses a self-testing platform for pressure gauges in air separation equipment, belonging to the field of pressure instrument testing technology. It includes a platform frame, a main passage, and at least two calibration branches. The main passage is equipped with a main valve, and the at least two calibration branches are connected in parallel to the main passage. Each calibration branch is equipped with a branch valve and a high-precision pressure gauge, with different ranges for the high-precision pressure gauges on different calibration branches. The main passage is connected to a composite gas cylinder via a gas cylinder interface. The end of each calibration branch is connected to a quick-connect fitting via a stainless steel flexible metal hose for connecting to the instrument under test. This utility model, by setting up three parallel calibration branches equipped with high-precision pressure gauges of different ranges, enables the calibration of various pressure gauges, differential pressure transmitters, and pressure sensors with a range ≤2.5MPa on a single platform. This solves the problem of needing multiple calibration devices due to the wide range of field instruments, achieving "one machine for multiple uses."

Description

Technical Field

[0001] This utility model relates to the field of pressure instrument testing and calibration technology, and in particular to a self-testing platform for pressure gauges in air separation equipment. Background Technology

[0002] In air separation and storage equipment such as the KDON-400Y / 400Y series, pressure gauges and pressure transmitters are core measuring instruments used extensively to ensure safe production, and the accuracy of their readings is crucial. Currently, the conventional calibration method for these instruments mainly relies on annual inspections by metrology institutes, which is time-consuming, costly, and cannot meet the immediate needs of daily maintenance and emergency fault diagnosis. Especially during production, when abnormal pressure readings occur, the lack of rapid on-site verification methods makes it difficult for operators to determine whether the inaccuracy is due to the instrument itself or actual fluctuations in the process system. This not only affects the efficiency of fault diagnosis but also creates hidden dangers for the safe operation of equipment. In addition, the wide range of pressure gauges on-site (e.g., from 0.1MPa to 2.5MPa) makes it difficult for traditional methods to provide a comprehensive calibration solution that covers multiple ranges, is easy to move, and is simple to operate. Utility Model Content

[0003] The purpose of this invention is to solve the problems of long calibration cycles, inability to quickly diagnose on-site, and lack of portable calibration methods covering multiple ranges in the existing technology of pressure gauges, and to propose a self-testing platform for pressure gauges in air separation equipment.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A self-testing platform for pressure gauges in air separation equipment includes a platform frame, a main passage and at least two calibration branches. The main passage is equipped with a main valve, and the at least two calibration branches are connected in parallel to the main passage. Each calibration branch is equipped with a branch valve and a high-precision pressure gauge. The high-precision pressure gauges on different calibration branches have different ranges. The main passage is connected to a composite gas cylinder via a gas cylinder interface; the end of the calibration branch is connected to a quick connector via a stainless steel flexible metal hose for connection to the instrument under test.

[0005] In some embodiments, the number of calibration branches is three, and the high-precision pressure gauges on them have ranges of 0-0.1MPa, 0-0.6MPa and 0-2.5MPa, respectively.

[0006] In some embodiments, a buffer tank is provided on the calibration branch with a range of 0 to 0.1 MPa, and the buffer tank is located between the branch valve and the high-precision pressure gauge of the branch.

[0007] In some embodiments, the platform frame is welded from stainless steel; the main passage and the verification branch are stainless steel pipes with a nominal diameter of DN15; the buffer tank is a stainless steel structure with a nominal diameter of DN40; and the stainless steel metal hose has a nominal diameter of DN6.

[0008] In some embodiments, a pressure reducing valve is provided between the gas cylinder interface and the main passage for reducing the pressure of the composite gas cylinder to the required working pressure.

[0009] In some embodiments, the branch valve and the main valve are straight-through shut-off valves.

[0010] In some embodiments, at least one of the verification branches is provided with a vent valve for releasing pressure after the test is completed.

[0011] In some embodiments, the platform frame is provided with casters at the bottom for continuous calibration of the pressure gauge under test.

[0012] Compared with the prior art, this utility model provides a self-testing platform for pressure gauges in air separation equipment, which has the following beneficial effects.

[0013] 1. This utility model, by setting up three parallel calibration branches equipped with high-precision pressure gauges of different ranges, realizes the calibration of various pressure gauges, differential pressure transmitters and pressure sensors with a range ≤2.5MPa on a single platform, solving the problem of needing to equip multiple calibration devices due to the wide range of field instruments, and realizing "one machine for multiple uses".

[0014] 2. This utility model, by configuring a quick connector and a stainless steel metal hose, enables the platform to support two modes: on-site uninterrupted testing and testing after disassembly. Operators can flexibly choose according to the site conditions, and testing can be completed without disassembly or with minimal disassembly, which can greatly reduce the workload and improve the efficiency of emergency response to unexpected situations.

[0015] 3. This utility model addresses the problem that small-range instruments are easily damaged by pressure shocks. A buffer tank is installed on the 0-0.1MPa calibration branch, which can effectively stabilize the pressure and prevent the instrument from bursting. This protects the precision instrument being calibrated and ensures the safety of the operators.

[0016] Other advantages, objectives and features of this invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be taught from practice of this invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the pressure gauge calibration platform of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the verification platform of this utility model.

[0019] Figure 3 This utility model Figure 2 A schematic diagram of the structure from the front view.

[0020] Figure 4 This utility model Figure 2 A top-down structural diagram.

[0021] Figure 5 This utility model Figure 2 A side view of the structure.

[0022] Figure 6 This is a schematic diagram of the main path and the verification branch of this utility model.

[0023] Figure 7 This is a schematic diagram of the structure of the buffer tank of this utility model.

[0024] Figure 8 This is a flowchart of the testing process for the pressure gauge with a range of ≤0.1MPa according to this utility model.

[0025] In the picture: 1. Platform frame; 2. Gas cylinder interface; 3. Main passage; 301. Main valve; 4. Calibration branch; 401. Branch valve; 5. Casters; 6. Composite gas cylinder; 7. Buffer tank; 701. High-precision pressure gauge; 8. Stainless steel metal hose; 9. Pressure reducing valve; 10. Quick connector. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Because the pressure gauges have a wide range, this comprehensive testing platform was designed. The platform has the function of calibrating pressure gauges with different ranges. It is practical, aesthetically pleasing, and easy to operate.

[0028] Example 1 Reference Figure 1-8 A self-testing platform for pressure gauges in air separation equipment includes a platform frame 1, a gas cylinder interface 2, a main passage 3, and a calibration branch 4. The platform frame 1 is used to support and fix each component.

[0029] A main valve 301 is installed on the main passage 3. There are three calibration branches 4 connected in parallel to the main passage 3. A gas cylinder interface 2 is located at the end of the main passage 3 furthest from the calibration branches 4. A composite gas cylinder 6 is connected to the main passage 3 through the gas cylinder interface 2. The calibration branches 4 are located downstream of the main valve 301. Each calibration branch 4 has a branch valve 401 (i.e., V1, V2, V3) and a high-precision pressure gauge 701 (i.e., P1, P2, P3) in sequence. The high-precision pressure gauges P1, P2, and P3 on different calibration branches 4 have different ranges. The ranges of the high-precision pressure gauges 701 on the three calibration branches 4 are 0–0.1 MPa, 0–0.6 MPa, and 0–2.5 MPa, respectively.

[0030] The comprehensive testing platform mainly consists of a composite gas cylinder 6, three high-precision pressure gauges 701 with different ranges, and corresponding calibration branches 4 and branch valves 401. Figure 1 As shown, V1, V2, and V3 are branch valves 401, and V4 is the main valve 301.

[0031] The range of the P1 high-precision pressure gauge 701 is 0 to 0.1 MPa, the range of the P2 high-precision pressure gauge 701 is 0 to 0.6 MPa, and the range of the P3 high-precision pressure gauge 701 is 0 to 2.5 MPa.

[0032] The operating handles of branch valve 401 and main valve 301 extend outward from the platform frame 1 for easy operation.

[0033] Meanwhile, to ensure the safety and reliability of calibration of small-range pressure gauges and differential pressure transmitters, a buffer tank 7 is installed on the calibration branch 4 of 0 to 0.1 MPa to prevent the gauge from bursting.

[0034] The buffer tank 7 is located between the branch valve 401 and the high-precision pressure gauge 701 of the calibration branch 4.

[0035] The number of high-precision pressure gauges 701 is equal to the number of calibration branches 4 and corresponds one-to-one. The high-precision pressure gauges 701 are installed on the platform frame 1.

[0036] To facilitate the movement of the testing platform and make it flexible and convenient, casters 5 are installed at the bottom of the platform frame 1. Each calibration branch 4 is also connected to a quick connector 10 for connecting the instrument under test at the end furthest from the main passage 3. Optionally, the quick connector 10 can be connected to the end of the calibration branch 4 through a section of stainless steel flexible metal hose 8.

[0037] The pressure gauge under test can be removed from the pipeline and connected to the stainless steel metal hose 8 for offline calibration, or the testing platform can be moved to the pressure gauge without removing it from the pipeline. The pressure gauge can be connected to the interface of the pressure gauge through the stainless steel metal hose 8 for calibration without disconnecting the pipeline.

[0038] The platform frame 1 is welded from stainless steel; the main passage 3 and the calibration branch 4 are stainless steel pipes with a nominal diameter of DN15; the buffer tank 7 is a stainless steel structure with a nominal diameter of DN40; and the stainless steel flexible metal hose 8 has a nominal diameter of DN6. A pressure reducing valve 9 is also installed between the gas cylinder interface 2 and the main passage 3 to reduce the pressure of the external composite gas cylinder 6 to the required working pressure. The branch valve 401 and the main valve 301 are straight-through shut-off valves.

[0039] The above embodiments can test pressure gauges, differential pressure transmitters or pressure sensors with different ranges.

[0040] Example 2 Taking a pressure gauge with a range of 0–0.1 MPa as an example, during the testing operation, the pressure gauge under test is connected via a stainless steel flexible metal hose 8. The pressure reducing valve 9 is a high-precision pressure reducing valve. The pressure is reduced to 0.1 MPa by the high-precision pressure gauge 701 (P1). The main valve 301 is opened, and the branch valve 401 (V1) is slowly opened. After the P1 reading rises to 0.02 MPa and stabilizes, the reading of the pressure gauge under test is observed and compared, and the data is recorded. Figure 8 As shown; then slowly open V1, and wait for the P1 reading to rise to 0.04MPa and stabilize. Observe the reading of the pressure gauge being measured for comparison and record the data; similarly, use the same method to increase the pressure to 0.06MPa, 0.08MPa, and 0.1MPa in sequence and record the data.

[0041] After the test is completed, close the pressure reducing valve 9 and the main valve 301 in sequence, and gently open the V3 branch valve 401. At this time, V3 acts as a vent valve to release the compressed gas in the test branch 4. Close V3 after the reading of the high-precision pressure gauge 701 on P3 is zero. If the difference is within the accuracy range of the pressure gauge, the pressure gauge under test can be considered qualified; otherwise, it is unqualified.

[0042] Example 3 Taking a differential pressure transmitter as an example, during the detection operation, the connection mode of the differential pressure transmitter is different from... Figure 8 The connection mode is the same as that of the medium pressure gauge. The other end of the differential pressure transmitter is open to the atmosphere. The pressure is controlled by the V2 branch valve 401. The differential pressure transmitter's range pressure is applied at 100%, 50%, and 25%, and then the percentage readings on the differential pressure transmitter's scale are observed and recorded. If the percentages match, it is considered qualified; otherwise, it is unqualified.

[0043] Example 4 Taking pressure gauges with a range of ≥0.1MPa and ≤0.6MPa as an example, the testing method is the same as the testing method for pressure gauges with a range of ≤0.1MPa, except that the branch pipe is replaced with the calibration branch 4 of V2 and P2.

[0044] Example 5 The pressure gauges with ranges of ≥0.6MPa and ≤2.5MPa were used for testing. The testing method was the same as that for the pressure gauge with a range of ≤0.1MPa. The branch pipe was changed to use V3 and P3 to calibrate branch 4, and the vent valve was changed to V2 valve for slow venting.

[0045] In summary, this testing platform addresses the challenge of calibrating pressure gauges in daily operations. By designing a pressure gauge calibration platform, it enables the calibration of pressure gauges and differential pressure transmitters. The platform boasts high calibration accuracy, making it easier to handle unexpected situations in production, storage, transportation, and daily operations, thereby improving the safety and reliability of metering devices. This testing platform has a wide range of applications, high practical value, is easy to operate, has a compact structure, and can calibrate and verify questionable pressure gauges, promptly identifying problems and ensuring the safe and stable operation of equipment. It has high potential for widespread adoption.

[0046] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A self-testing platform for pressure gauges in air separation equipment, comprising a platform frame (1), characterized in that, It also includes a main passage (3) and at least two verification branches (4). The main passage (3) is equipped with a main valve (301). At least two verification branches (4) are connected in parallel to the main passage (3). The verification branches (4) are equipped with branch valves (401) and high-precision pressure gauges (701). The high-precision pressure gauges (701) on different verification branches (4) have different ranges. The main passage (3) is connected to the composite gas cylinder (6) through the gas cylinder interface (2); the end of the calibration branch (4) is connected to a quick connector (10) through a stainless steel metal hose (8) for connecting to the instrument under test.

2. The self-testing platform for pressure gauges in air separation equipment according to claim 1, characterized in that, The number of the calibration branch (4) is three, and the ranges of the high-precision pressure gauges (701) on them are 0-0.1MPa, 0-0.6MPa and 0-2.5MPa, respectively.

3. A self-testing platform for pressure gauges in air separation equipment according to claim 2, characterized in that, The calibration branch (4) with a range of 0 to 0.1 MPa is equipped with a buffer tank (7), which is located between the branch valve (401) and the high-precision pressure gauge (701) of the branch.

4. A self-testing platform for pressure gauges in air separation equipment according to claim 3, characterized in that, The platform frame (1) is welded from stainless steel; the main passage (3) and the verification branch (4) are stainless steel pipes with a nominal diameter of DN15; the buffer tank (7) is a stainless steel structure with a nominal diameter of DN40; and the stainless steel metal hose (8) has a nominal diameter of DN6.

5. A self-testing platform for pressure gauges in air separation equipment according to claim 4, characterized in that, A pressure reducing valve (9) is provided between the gas cylinder interface (2) and the main passage (3) to reduce the pressure of the composite gas cylinder (6) to the required working pressure.

6. A self-testing platform for pressure gauges in air separation equipment according to claim 5, characterized in that, The branch valve (401) and the main valve (301) are straight-through shut-off valves.

7. A self-testing platform for pressure gauges in air separation equipment according to claim 6, characterized in that, At least one of the verification branches (4) is provided with a vent valve for depressurizing after the test is completed.

8. A self-testing platform for pressure gauges in air separation equipment according to claim 7, characterized in that, The platform frame (1) is equipped with a moving wheel (5) at the bottom for continuous calibration of the pressure gauge under test.

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