A high-precision pressure measuring mechanism and air pressure detection equipment

Abstract

This utility model provides a high-precision pressure measuring mechanism and a pressure detection device, relating to the field of pressure detection technology. The high-precision pressure measuring mechanism includes a differential pressure sensor with a connector pipe fixedly connected to it. The connector pipe has a connecting structure, which includes an arc-shaped outer shell with an integrally formed extension plate. A threaded rod is provided on the extension plate, and a locking nut is threaded onto the threaded rod. The pressure detection device includes two pressure-sensing tubes connected to the high-precision pressure measuring mechanism. At least two connecting pipes are provided between the two pressure-sensing tubes, and one-way valves with opposite flow directions are provided on the two connecting pipes. This utility model, through its quick-installation connecting structure and bidirectional pressure relief protection circuit, effectively prevents overpressure damage to the differential pressure sensor while ensuring measurement accuracy, thus providing high safety.

Description

Technical Field

[0001] This utility model relates to the field of air pressure detection technology, and in particular to a high-precision pressure measuring mechanism and air pressure detection equipment. Background Technology

[0002] In many fields such as industrial process control, environmental monitoring, aerospace, and fluid mechanics research, accurate measurement of gas or liquid pressure is a crucial technology. Currently, pressure measurement devices on the market, especially those requiring pressure difference monitoring, widely employ differential pressure sensors as their core measuring element. The basic principle involves separately acquiring the pressure from the high-pressure side (H) and the low-pressure side (L), guiding these two pressure signals to two sensing diaphragms of the differential pressure sensor. Inside the sensor, a precise mechanical sensing element (such as a strain gauge or capacitor plate) detects the pressure difference between the two sides and converts it into a standard electrical signal output.

[0003] However, to achieve extremely high measurement accuracy, differential pressure sensors typically have very thin and sensitive internal diaphragms, resulting in a clear upper limit to the absolute pressure they can withstand. In actual industrial settings, pressure fluctuations in pipelines or equipment can be extremely wide, making pressure spikes or overpressure situations caused by operational errors highly likely.

[0004] When such sudden high pressure is transmitted directly to the differential pressure sensor through the pressure tapping tube, even if the pressure difference between the high-pressure and low-pressure sides does not exceed the measurement range, the absolute pressure applied on one side is very likely to far exceed the pressure resistance limit of the sensor diaphragm. This overpressure shock can cause plastic deformation or direct damage to the sensor diaphragm. At best, it can lead to irreversible deviations in measurement accuracy and inaccurate readings, affecting the quality of production process control. At worst, it can directly puncture the diaphragm, rendering the sensor permanently unusable. This type of sensor failure caused by pressure shock not only incurs high equipment replacement costs but also, due to the suddenness and unpredictability of the failure, results in significant time losses and production interruption risks, severely impacting the reliability and economy of continuous production processes. Utility Model Content

[0005] On one hand, this application provides a high-precision pressure measuring mechanism, including a differential pressure sensor, and a connector pipe is fixedly connected to the differential pressure sensor. The connector pipe is provided with a connecting structure, and a connecting pipe is provided inside the connecting structure. The connecting structure includes an arc-shaped shell, and an extension plate is integrally provided on the arc-shaped shell. A threaded rod is provided on the extension plate, and a locking nut is threaded on the threaded rod. The size of the inner diameter of the arc-shaped shell can be adjusted by the cooperation of the threaded rod and the locking nut.

[0006] Preferably, a gap is formed between the arc-shaped outer shell and the extension plate, and a support is provided in the gap. The support enhances the rigidity of the connection structure and prevents the arc-shaped outer shell from deforming under overpressure.

[0007] Preferably, the support member is in the form of a transverse U-shape, which provides uniform support force and improves the stability of the connection structure.

[0008] Preferably, an inner gasket is fixedly provided on the inner side of the arc-shaped outer shell, and a sealing sheet is provided at the edge of the inner gasket. The sealing sheet has a toothed groove at its edge. The toothed groove design enhances the sealing performance of the sealing sheet and effectively prevents pressure leakage.

[0009] Preferably, both the inner gasket and the sealing sheet are made of rubber. The rubber material of the inner gasket and sealing sheet provides good elasticity and cushioning, reducing pressure impact.

[0010] Preferably, in another aspect, this application also provides a high-precision pressure measuring mechanism for air pressure detection, including the high-precision pressure measuring mechanism described in any one of the above, including a pressure tapping tube one and a pressure tapping tube two, and the high-precision pressure measuring mechanism is connected to the pressure tapping tube one and the pressure tapping tube two. At least two connecting pipes are provided between the pressure tapping tube one and the pressure tapping tube two, and one-way valves with opposite flow directions are provided on the two connecting pipes. The one-way valves with opposite flow directions allow the pressure to be balanced between the pressure tapping tubes, preventing one-sided overpressure from damaging the differential pressure sensor.

[0011] Preferably, a temperature tube is provided on the outside of the first pressure tube and the second pressure tube, and the temperature tube is used to ensure that the pressure tubes on the high-pressure side and the low-pressure side are at the same temperature. The temperature tube ensures that the pressure tubes on the high-pressure side and the low-pressure side are at the same temperature, thus eliminating the influence of temperature difference on measurement accuracy.

[0012] Preferably, a flange is provided on the outside of the temperature tube, and the flange is used to fix the temperature tube to the external fixed bracket. The flange facilitates fixing the temperature tube to the external bracket, thereby improving the installation stability and reliability of the entire measuring mechanism.

[0013] This utility model provides a high-precision pressure measuring mechanism and air pressure detection device, which, compared with the prior art:

[0014] 1. This utility model achieves a fast, reliable, and well-sealed connection with the system pipeline through a connection structure consisting of an arc-shaped shell, an extension plate, a threaded rod, and a locking nut, laying the foundation for accurate measurement. At the same time, the bidirectional one-way valve pressure relief circuit set between the pressure taps can instantly balance the absolute pressure on both sides, providing crucial overpressure protection for the core differential pressure sensor and greatly improving the reliability and service life of the equipment in environments with severe pressure fluctuations.

[0015] 2. This utility model effectively eliminates the interference of uneven ambient temperature on measurement results by placing the pressure taps together in a single temperature tube, thus ensuring high measurement accuracy from the source. The overall fixing design, including flanges, enhances the stability of equipment installation, achieving a balance between high-precision measurement and high-reliability protection, and reducing the risk of equipment failure and maintenance costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the connection between the differential pressure sensor and the connection structure according to an embodiment of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the connection structure according to an embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the air pressure detection device according to an embodiment of the present utility model.

[0020] icon:

[0021] 1. Differential pressure sensor; 2. Connection structure; 10. Connector pipe; 11. Connecting pipe; 12. Pressure tap one; 13. Pressure tap two; 14. Temperature tube; 15. High-precision pressure measuring mechanism; 16. Connecting pipe; 17. One-way valve; 18. Flange; 20. Arc-shaped shell; 21. Inner gasket; 22. Extension plate; 23. Support component; 24. Threaded rod; 25. Locking nut; 210. Sealing plate; 211. Groove; 230. Orifice. Detailed Implementation

[0022] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] Please refer to Figure 1 This utility model provides a high-precision pressure measuring mechanism, including a differential pressure sensor 1, and a connector pipe 10 is fixedly connected to the differential pressure sensor 1. A connecting structure 2 is provided on the connector pipe 10, and a connecting pipe 11 is provided inside the connecting structure 2, forming a complete pressure measurement interface, which provides a basic platform for realizing high precision and overpressure protection functions.

[0024] like Figure 2As shown, the connecting structure 2 includes an arc-shaped outer shell 20, and an extension plate 22 is integrally provided on the arc-shaped outer shell 20. A threaded rod 24 is provided on the extension plate 22, and a locking nut 25 is threaded on the threaded rod 24. The size of the inner diameter of the arc-shaped outer shell 20 can be adjusted by the cooperation of the threaded rod 24 and the locking nut 25. By tightening the locking nut 25, the two extension plates 22 are forced to come together, thereby causing the arc-shaped outer shell 20 to undergo elastic deformation to shrink its inner diameter, and finally clamping and sealing the internal connecting pipe 11. This realizes a quick installation and disassembly pipe connection method, while providing an adjustable clamping force to ensure sealing reliability.

[0025] To improve the stability of the connection structure 2, a gap 230 is formed between the arc-shaped outer shell 20 and the extension plate 22, and a support member 23 is provided in the gap 230. The support member 23 is in the shape of a transverse U.

[0026] To improve sealing, an inner gasket 21 is fixedly provided on the inner side of the arc-shaped outer shell 20, and a sealing sheet 210 is provided at the edge of the inner gasket 21. The sealing sheet 210 is provided with a toothed groove 211 at the edge. Both the inner gasket 21 and the sealing sheet 210 are made of rubber.

[0027] like Figure 3 As shown, on the other hand, this application also provides a high-precision pressure measuring mechanism for air pressure detection, including a pressure tapping tube 12 and a pressure tapping tube 2 13, with a high-precision pressure measuring mechanism 15 connected to the pressure tapping tube 12 and the pressure tapping tube 2 13. At least two connecting pipes 16 are provided between the pressure tapping tube 12 and the pressure tapping tube 2 13, and one-way valves 17 with opposite flow directions are provided on the two connecting pipes 16. When the pressure on one side of the pressure tapping tube, such as the high-pressure side pressure tapping tube 12, spikes abnormally, the corresponding one-way valve 17 will be opened, allowing some high-pressure fluid to be released through the connecting pipe 16 to the pressure tapping tube 2 13 on the other side, thereby quickly balancing the absolute pressure on both sides and avoiding the dangerous situation where the difference is not exceeded but the absolute pressure on one side is too high.

[0028] Temperature tubes 14 are provided on the outside of pressure tap 12 and pressure tap 13. Temperature tubes 14 are used to ensure that the pressure taps on the high-pressure side and the low-pressure side are at the same temperature. Flanges 18 are provided on the outside of temperature tubes 14. Flanges 18 are used to fix temperature tubes 14 to an external fixed bracket. Temperature tubes 14 effectively eliminate the influence of uneven ambient temperature on differential pressure measurement accuracy by achieving thermal balance, thereby ensuring measurement accuracy. The structure of flange 18 enhances the installation stability of the entire detection equipment in a vibration environment.

[0029] In summary, during use, the connecting structure 2, consisting of the arc-shaped outer shell 20, the extension plate 22, the threaded rod 24, and the locking nut 25, quickly and reliably seals the connector pipe 10 to the connecting pipe 11 on the system side, establishing a pressure transmission path. Then, the high-pressure side and low-pressure side pressure of the system under test are transmitted to the differential pressure sensor 1 through the first pressure tap 12 and the second pressure tap 13, respectively. On the pressure transmission path, the connecting pipe 16, which is connected between the two pressure taps and equipped with one-way valves 17 in opposite directions, forms a bidirectional pressure relief circuit. When abnormal high pressure occurs on either side, the corresponding one-way valve 17 will open to relieve pressure to the other side, thereby quickly balancing the absolute pressure on both sides and effectively preventing the sensor diaphragm from being damaged by unilateral overpressure. Subsequently, the protected differential pressure signal reaches the sensor body, thereby accurately measuring the air pressure.

[0030] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-precision pressure measuring mechanism, characterized in that: The device includes a differential pressure sensor (1), and a connector pipe (10) is fixedly connected to the differential pressure sensor (1). A connecting structure (2) is provided on the connector pipe (10), and a connecting pipe (11) is provided inside the connecting structure (2). The connecting structure (2) includes an arc-shaped shell (20), and an extension plate (22) is integrally provided on the arc-shaped shell (20). A threaded rod (24) is provided on the extension plate (22), and a locking nut (25) is threaded on the threaded rod (24). The arc-shaped shell (20) can adjust the size of the inner diameter of the arc-shaped shell (20) by cooperating with the threaded rod (24) and the locking nut (25).

2. The high-precision pressure measuring mechanism according to claim 1, characterized in that: A gap (230) is formed between the arc-shaped outer shell (20) and the extension plate (22), and a support member (23) is provided in the gap (230).

3. The high-precision pressure measuring mechanism according to claim 2, characterized in that: The support member (23) is in a transverse U-shape.

4. The high-precision pressure measuring mechanism according to claim 1, characterized in that: An inner gasket (21) is fixedly provided on the inner side of the arc-shaped outer shell (20), and a sealing plate (210) is provided at the edge of the inner gasket (21), and a toothed groove (211) is provided at the edge of the sealing plate (210).

5. The high-precision pressure measuring mechanism according to claim 4, characterized in that: Both the inner gasket (21) and the sealing sheet (210) are made of rubber.

6. A barometric pressure testing device, comprising the high-precision pressure measuring mechanism as described in any one of claims 1-5, characterized in that: It includes a pressure tapping tube one (12) and a pressure tapping tube two (13), and a high-precision pressure measuring mechanism (15) is connected to the pressure tapping tube one (12) and the pressure tapping tube two (13). At least two connecting pipes (16) are provided between the pressure tapping tube one (12) and the pressure tapping tube two (13), and one-way valves (17) with opposite flow directions are provided on the two connecting pipes (16).

7. The air pressure detection device according to claim 6, characterized in that: Temperature tubes (14) are provided on the outside of the first pressure tube (12) and the second pressure tube (13), and the temperature tubes (14) are used to ensure that the pressure tubes on the high-pressure side and the low-pressure side are at the same temperature.

8. The air pressure detection device according to claim 7, characterized in that: A flange (18) is provided on the outside of the temperature tube (14), and the flange (18) is used to fix the temperature tube (14) to the external fixed bracket.

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