An ultrahigh pressure gauge

Abstract

This application discloses an ultra-high pressure gauge, relating to the technical field of pressure gauges, including a housing assembly; a movement support frame disposed within the housing assembly; the movement support frame is provided with a display mechanism, a connector, a Bourdon tube, and a gear transmission mechanism; the connector is connected to the Bourdon tube, and the gear transmission mechanism connects the Bourdon tube and the display mechanism; the Bourdon tube is a C-shaped Bourdon tube made of high-strength alloy steel, and the wall thickness of the Bourdon tube is designed for strength based on a preset maximum design pressure and the allowable stress of the material, and has a design safety factor, thereby enabling the pressure gauge to stably measure pressures up to 1000 MPa. This application is adaptable to ultra-high pressure environments.

Description

Technical Field

[0001] This application relates to the technical field of pressure gauges, and in particular to an ultra-high pressure gauge. Background Technology

[0002] Pressure gauges are key instruments widely used in industrial process control, scientific experiments, and equipment monitoring. They convert the pressure value of the measured medium into a visible indication or standard output signal through mechanical or electronic sensing elements. Based on their measurement principles, pressure gauges are mainly classified into mechanical (such as Bourdon tube and diaphragm types) and electronic (such as piezoresistive and piezoelectric types). Among these, mechanical pressure gauges still hold an important position in many industrial applications due to their intuitive structure, lack of external power supply, stability, reliability, and ease of direct reading.

[0003] Currently, the demand for ultra-high pressure measurement in industry and scientific research is growing rapidly. In cutting-edge and critical fields such as ultra-high pressure waterjet cutting, ultra-high pressure metal forming, ultra-high pressure oil and gas extraction (e.g., shale gas fracturing monitoring), ultra-high pressure sterilization equipment, and high-pressure performance testing in materials science, the operating pressure of systems often reaches hundreds of megapascals or even thousands of megapascals. These extreme operating conditions place unprecedentedly higher demands on the upper limit of the measurement range, measurement accuracy, long-term stability, and environmental tolerance of pressure measuring instruments.

[0004] However, in the existing technology, conventional mechanical pressure gauges are limited by the material strength and structural design of their core elastic elements, and their reliable measurement range is mostly concentrated below 0-600MPa, making it difficult to stably and accurately apply to ultra-high pressure environments above 1000MPa. Summary of the Invention

[0005] To adapt to ultra-high pressure environments, this application provides an ultra-high pressure gauge.

[0006] This application provides an ultra-high pressure gauge, which adopts the following technical solution: An ultra-high pressure gauge includes a housing assembly; The movement support is disposed within the housing assembly; The mechanism support is provided with a display mechanism, a connector, a spring tube, and a gear transmission mechanism. The connector is connected to the spring tube, and the gear transmission mechanism is connected to the spring tube and the display mechanism. The Bourdon tube is a C-shaped Bourdon tube made of high-strength alloy steel. The wall thickness of the Bourdon tube is designed for strength based on the preset maximum design pressure and the allowable stress of the material, and has a design safety factor, so that the pressure gauge can stably measure pressures up to 1000MPa.

[0007] By adopting the above technical solution, using a C-shaped Bourdon tube made of high-strength alloy steel as the Bourdon tube, it can withstand higher pressure; based on the preset maximum design pressure and the allowable stress of the material, the wall thickness of the Bourdon tube is designed for strength and a design safety factor is set, which enables the pressure gauge to stably measure pressures up to 1000MPa, meeting the pressure measurement requirements under ultra-high pressure environments.

[0008] Optionally, the wall thickness (h) of the spring tube is calculated and determined according to the formula h = (P * R) / (2 * [σ]), where P is the maximum design pressure, R is the outer radius of the spring tube, and [σ] is the allowable stress of the material.

[0009] By adopting the above technical solution and using a C-shaped Bourdon tube made of high-strength alloy steel as the Bourdon tube, the pressure gauge can stably measure pressures up to 1000 MPa. The wall thickness of the Bourdon tube is calculated and determined according to a specific formula, which allows the Bourdon tube to be designed for strength based on the preset maximum design pressure and the allowable stress of the material, and has a design safety factor, further ensuring that the pressure gauge can stably measure ultra-high pressure.

[0010] Optionally, the design safety factor is 1.2 to 1.5.

[0011] By adopting the above technical solution, a C-shaped Bourdon tube made of high-strength alloy steel is used as the Bourdon tube, and the wall thickness of the Bourdon tube is designed for strength based on the preset maximum design pressure and the allowable stress of the material. At the same time, the safety factor is designed to be 1.2 to 1.5, which enables the ultra-high pressure gauge to stably measure pressures up to 1000MPa, ensuring the stability and reliability of the pressure gauge in ultra-high pressure environments.

[0012] Optionally, the gear transmission mechanism has a radial clearance ≤0.02mm and an axial clearance ≤0.15mm after assembly.

[0013] By adopting the above technical solutions, the assembly clearance of the gear transmission mechanism can be reduced, the stability and accuracy of the gear transmission can be improved, and thus the accuracy and reliability of the pressure gauge measurement can be enhanced.

[0014] Optionally, the gear transmission mechanism includes an adjustment foot for calibrating the zero point or range of the pressure gauge, the adjustment foot being mounted on the movement support.

[0015] By adopting the above technical solution, the zero point or range of the pressure gauge can be calibrated by using the adjusting feet set on the mechanism support, ensuring the accuracy and reliability of the pressure gauge when stably measuring pressures up to 1000MPa, and meeting the measurement needs under different working conditions.

[0016] Optionally, the housing assembly includes a watch glass, a safety diaphragm, a cover plate, and a retaining ring, wherein the safety diaphragm is disposed between the watch glass and the cover plate.

[0017] By adopting the above technical solution, the safety diaphragm can play a role when the internal pressure of the pressure gauge rises abnormally during ultra-high pressure measurement, reducing the possibility of dangerous situations such as pressure gauge rupture and ensuring safe use. At the same time, together with the gauge glass, cover plate and cover ring, it forms an outer shell assembly, which protects the internal structure of the pressure gauge.

[0018] Optionally, the gear transmission mechanism includes a sector gear, a central gear, a connecting rod, a fixed frame, and a mechanism base plate; One end of the connecting rod is hinged to the free end of the spring tube, and the other end is hinged to the end of the sector gear. The sector gear meshes with the central gear, and the gear shaft of the central gear is coaxially and fixedly connected to the pointer of the pressure gauge; The sector gear and the central gear are mounted on the base plate of the movement via a gear shaft, and the fixing bracket presses and fixes the base plate of the movement inside the pressure gauge case.

[0019] By adopting the above technical solution, the components of the gear transmission mechanism are tightly connected and rationally arranged, which can more stably and accurately transmit the displacement changes of the Bourdon tube to the pointer, thereby achieving precise display and measurement of ultra-high pressure.

[0020] Optionally, a hairspring is fitted onto the gear shaft of the central gear, and the outer end of the hairspring is fixed to the hairspring support on the base plate of the movement.

[0021] By adopting the above technical solution, the hairspring can eliminate the backlash error in the gear transmission mechanism, making the rotation of the pressure gauge pointer more stable and accurate, and improving the stability and accuracy of pressure gauge measurement.

[0022] Optionally, the gear shafts of the sector gear and the central gear are supported in jewel bearings.

[0023] By adopting the above technical solutions, friction during the rotation of sector gears and central gears is reduced, improving the accuracy and stability of the gear transmission mechanism, thereby enhancing the accuracy and reliability of ultra-high pressure gauge measurements.

[0024] In summary, this application includes at least one of the following beneficial effects: 1. The Bourdon tube is a C-shaped tube made of high-strength alloy steel, and the wall thickness is designed for strength based on the preset maximum design pressure and allowable material stress, and has a design safety factor, which enables the pressure gauge to stably measure pressures up to 1000MPa, meeting the measurement requirements of ultra-high pressure environments; 2. This solves the problem that conventional mechanical pressure gauges are difficult to stably and accurately apply to ultra-high pressure environments above 1000MPa due to limitations in the strength of the core elastic element material and structural design. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of an embodiment of this application; Figure 3 yes Figure 2 Enlarged schematic diagram of part A; Figure 4 This is a schematic diagram of the connection structure of the gear transmission mechanism in the embodiments of this application; Figure 5 yes Figure 4 Enlarged schematic diagram of part B; Figure 6 This is a schematic diagram of the internal structure of the housing assembly in an embodiment of this application.

[0026] Reference numerals: 1. Housing assembly; 11. Watch glass; 12. Safety diaphragm; 13. Cover plate; 14. Cover ring; 2. Movement support; 3. Display mechanism; 4. Connector; 5. Bourdon tube; 6. Gear transmission mechanism; 61. Adjustment foot; 62. Sector gear; 63. Center gear; 631. Hairspring; 64. Connecting rod; 65. Fixture; 66. Movement base plate. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0028] This application discloses an ultra-high pressure gauge.

[0029] See Figure 1 and Figure 2 This application mainly uses a high-strength spring tube 5 and a precision gear transmission to measure ultra-high pressure, achieving the effect of stable pressure measurement up to 1000MPa. The following is a further detailed description of this application. Example

[0030] See Figure 1 and Figure 2The ultra-high pressure gauge provided in this application includes a mechanism support 2, a display mechanism 3, a connector 4, a Bourdon tube 5, a gear transmission mechanism 6, and a housing assembly 1. The connector 4 is connected to the Bourdon tube 5, introducing the measured medium into the Bourdon tube 5. The gear transmission mechanism 6 connects the Bourdon tube 5 and the display mechanism 3, converting the elastic deformation of the Bourdon tube 5 into the rotation of the display mechanism 3, thereby reading the pressure value. The housing assembly 1 protects the internal components. This structure enables the components to work together, achieving accurate and stable pressure measurement under ultra-high pressure conditions.

[0031] Specifically, the movement bracket 2 serves as the supporting foundation for the entire internal structure of the pressure gauge. The movement bracket 2 is generally made of metal materials, such as stainless steel, which has good strength and stability, capable of withstanding the weight and pressure of the internal components. High-strength aluminum alloy can also be used; aluminum alloy is lightweight, making it easy to install and carry. The movement bracket 2 secures the various components together using screws or welding, ensuring their relative positional stability.

[0032] See Figure 2 and Figure 3 The Bourdon tube 5 is a key component inside the pressure gauge that senses pressure and generates deformation. The function of the Bourdon tube 5 can be divided into two steps. First, it senses pressure deformation. When the measured medium enters the interior of the Bourdon tube 5, the pressure inside the tube will cause a small elastic deformation at the free end of the Bourdon tube 5 (usually C-shaped or spiral-shaped). The magnitude of the deformation is proportional to the pressure level. Second, it transmits the initial motion, transmitting the deformation (linear or arc displacement) of the free end to the subsequent movement transmission mechanism (such as the connecting rod 64), providing the initial power for the final pointer rotation.

[0033] The Bourdon tube 5 is a C-shaped Bourdon tube made of high-strength alloy steel. This alloy steel has extremely high strength and toughness, capable of withstanding ultra-high pressure without rupture. The C-shaped structure of the Bourdon tube 5 makes it easier to undergo elastic deformation under pressure. The wall thickness of the Bourdon tube 5 is designed for strength based on the preset maximum design pressure and the allowable stress of the material, and has a design safety factor, enabling the pressure gauge to stably measure pressures up to 1000 MPa. The specific tube diameter and wall thickness can be determined according to the actual pressure range and material properties. The wall thickness (h) of the Bourdon tube 5 is calculated using the formula h = (P * R) / (2 * [σ]), where P is the maximum design pressure, R is the outer radius of the Bourdon tube 5, and [σ] is the allowable stress of the material. The design safety factor is 1.2 to 1.5, which better ensures the safety and reliability of the Bourdon tube 5 under ultra-high pressure environments. When pressure enters the Bourdon tube 5, the Bourdon tube 5 undergoes elastic deformation, which is the basis for subsequent pressure display.

[0034] See Figure 1The display mechanism 3 typically consists of a dial and a pointer. The dial is marked with different pressure values ​​for easy reading. The dial generally has a flat, circular design with a smooth surface and clear graduations. The pointer is usually made of metal, such as a copper alloy, which offers good rigidity and corrosion resistance.

[0035] See Figure 4 and Figure 5 The pointer is fixedly connected coaxially to the gear shaft of the central gear 63, and indicates the corresponding pressure value on the dial as the gear transmission mechanism 6 rotates.

[0036] See Figure 4 and Figure 6 Connector 4 is used to connect the pressure gauge and the pipe to be measured. Connector 4 typically uses a threaded connection to ensure a tight seal. The material of connector 4 is generally compatible with that of the Bourdon tube 5 to ensure good compatibility and corrosion resistance. For example, when the Bourdon tube 5 is made of high-strength alloy steel, connector 4 can also be made of the same material or a material with similar properties. Connector 4 also includes a pressure relief port to improve safety. The main functions of connector 4 are to establish a medium passage, providing a channel for the measured pressure medium (gas, liquid, etc.) to enter the pressure gauge, ensuring that the medium can smoothly enter the Bourdon tube 5; and to provide fixation and protection, stabilizing the pressure gauge in the measuring position. At the same time, the sealing structure (such as gaskets, threaded seals) reduces the possibility of medium leakage, greatly reducing the possibility of leakage affecting measurement accuracy or causing safety hazards.

[0037] See Figure 3 and Figure 5 Gear transmission mechanism 6 (gear transmission mechanism 6 in Figure 4 The gauge (as indicated by the bid) includes a sector gear 62, a central gear 63, a connecting rod 64, a fixing bracket 65, and a movement base plate 66. The fixing bracket 65 presses and fixes the movement base plate 66 within the gauge case. One end of the connecting rod 64 is hinged to the free end of the Bourdon tube 5, and the other end is hinged to the end of the sector gear 62. The connecting rod 64 is a key connecting component between the Bourdon tube 5 and the gear transmission mechanism 6, serving two main functions. First, it transmits motion, receiving the end displacement (linear or arcuate motion) generated by the Bourdon tube 5 under pressure and accurately transmitting it to the central gear 63 or the sector gear 62 of the movement. Second, it buffers and adapts, using its small allowance to accommodate installation errors between the Bourdon tube 5 and the gear transmission mechanism 6, reducing the possibility of component damage or transmission jamming caused by rigid connections.

[0038] When the spring tube 5 (the spring tube 5 is in) Figure 4When the pressure gauge undergoes elastic deformation under pressure, it drives the connecting rod 64 to move, which in turn causes the sector gear 62 to rotate. The sector gear 62 meshes with the central gear 63, transmitting the rotation of the sector gear 62 to the central gear 63. The gear shaft of the central gear 63 is coaxially and fixedly connected to the pointer of the pressure gauge, so that the pointer indicates the pressure value on the dial as the central gear 63 rotates.

[0039] See Figure 4 The connector 4 and the spring tube 5 are connected together by tightening with a double nut, and then connected to the gear transmission mechanism 6 by screws. The gear transmission mechanism 6 needs to be corrected before assembly, and the radial clearance should be corrected to ≤0.02 and the axial clearance should be corrected to ≤0.15.

[0040] During assembly, screw a double nut onto the left-hand threaded end of the Bourdon tube 5, then screw it into the connector 4 and tighten it. During this assembly, ensure that the end face of the Bourdon tube 5 and the end face of the connector 4 fit tightly and seal, and that the Bourdon tube 5 is parallel to the connector 4. Next, place a sealing plug on the other end of the Bourdon tube 5 and secure it with a compression nut to ensure a tight seal. After assembly, a pressure test must be conducted on an overpressure test bench. The tube should be able to withstand 110% of the upper limit pressure for 15 minutes without any leakage.

[0041] See Figure 5 The gear shafts of sector gear 62 and center gear 63 are supported in jewel bearings. These jewel bearings are sliding bearings made of hard materials (such as synthetic corundum) to reduce friction, improve transmission sensitivity and durability, and enhance the accuracy and stability of the gear transmission. A hairspring 631 is fitted onto the gear shaft of center gear 63, and the outer end of the hairspring 631 is fixed to a hairspring 631 support on the movement base plate 66. The function of the hairspring 631 is to eliminate backlash errors in the gear transmission and improve measurement accuracy.

[0042] See Figure 4 and Figure 5In addition, the gear transmission mechanism 6 also includes an adjustment foot 61 for calibrating the zero point or range of the pressure gauge. The adjustment foot 61 is mounted on the mechanism support 2. By adjusting the foot 61, the pressure gauge can be initialized and calibrated to ensure the accuracy of the measurement results. The adjustment foot 61 is usually an adjustable component fixed on the mechanism support 2. Its core function is to calibrate the indication accuracy of the pressure gauge, and it is divided into two categories: "zero point adjustment" and "range adjustment". First, for zero point adjustment, when the pressure is zero, if the pointer does not point to the zero mark, the position of the foot can be adjusted to change the initial meshing state of the sector gear 62, calibrating the pointer to zero. Second, for range adjustment, if there is a fixed deviation between the pointer indication value and the actual pressure value (such as the reading being generally too high or too low), the lever arm ratio of the transmission mechanism can be changed by fine-tuning the foot, so that the pointer rotation angle is precisely matched with the pressure change, correcting the range error.

[0043] See Figure 6 The housing assembly 1 includes a surface glass 11 (the surface glass 11 is in...) Figure 1 The pressure gauge comprises a safety diaphragm 12, a cover plate 13, and a retaining ring 14. The gauge glass 11 is made of a transparent, high-strength material, such as tempered glass, which protects the internal components while allowing easy observation of the pointer and dial. The safety diaphragm 12 is positioned between the gauge glass 11 and the cover plate 13. When the internal pressure of the pressure gauge becomes too high, causing a hazard, the safety diaphragm 12 will rupture first, releasing the pressure and preventing injury to surrounding personnel and equipment. The cover plate 13 and retaining ring 14 protect the overall structure of the pressure gauge, reducing the possibility of dust, moisture, etc., entering the interior and affecting the normal operation of the pressure gauge.

[0044] The implementation principle of an ultra-high pressure gauge according to an embodiment of this application is as follows: The measured medium enters the Bourdon tube 5 through connector 4. Under ultra-high pressure, the Bourdon tube 5 undergoes elastic deformation, driving the connecting rod 64, which is hinged to it, to move. The movement of the connecting rod 64 causes the sector gear 62 to rotate. The sector gear 62 meshes with the central gear 63, transmitting the rotation to the central gear 63. The rotation of the central gear 63 causes the pointer to indicate the corresponding pressure value on the dial. Through the precise gear transmission mechanism 6 and the high-strength Bourdon tube 5 design, along with reasonable safety protection measures, this pressure gauge can stably and accurately measure pressure under ultra-high pressure environments. Compared with existing technologies, it greatly improves the upper limit of the measurement range and accuracy, meeting the needs of ultra-high pressure industrial and scientific research fields.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An ultra-high pressure gauge, characterized in that: Includes housing assembly (1); The movement support (2) is disposed within the outer casing assembly (1); The mechanism support (2) is provided with a display mechanism (3), a connector (4), a spring tube (5) and a gear transmission mechanism (6). The connector (4) is connected to the spring tube (5), and the gear transmission mechanism (6) is connected to the spring tube (5) and the display mechanism (3). The spring tube (5) is a C-shaped Bourdon tube made of high-strength alloy steel. The wall thickness of the spring tube (5) is designed for strength based on the preset maximum design pressure and the allowable stress of the material and has a design safety factor, so that the pressure gauge can stably measure pressures up to 1000 MPa.

2. The ultra-high pressure gauge according to claim 1, characterized in that: The wall thickness (h) of the spring tube (5) is determined by the formula h = (P * R) / (2 * [σ]), where P is the maximum design pressure, R is the outer radius of the spring tube (5), and [σ] is the allowable stress of the material.

3. The ultra-high pressure gauge according to claim 2, characterized in that: The design safety factor is 1.2 to 1.

5.

4. The ultra-high pressure gauge according to claim 1, characterized in that: The gear transmission mechanism (6) has a radial clearance ≤0.02mm and an axial clearance ≤0.15mm after assembly.

5. The ultra-high pressure gauge according to claim 4, characterized in that: The gear transmission mechanism (6) includes an adjustment foot (61) for calibrating the zero point or range of the pressure gauge, the adjustment foot (61) being mounted on the movement support (2).

6. The ultra-high pressure gauge according to claim 5, characterized in that: The housing assembly (1) includes a watch glass (11), a safety diaphragm (12), a cover plate (13) and a ring (14), wherein the safety diaphragm (12) is disposed between the watch glass (11) and the cover plate (13).

7. The ultra-high pressure gauge according to claim 6, characterized in that: The gear transmission mechanism (6) includes a sector gear (62), a central gear (63), a connecting rod (64), a fixing frame (65), and a mechanism base plate (66). One end of the connecting rod (64) is hinged to the free end of the spring tube (5), and the other end is hinged to the end of the sector gear (62); The sector gear (62) meshes with the central gear (63), and the gear shaft of the central gear (63) is coaxially and fixedly connected with the pointer of the pressure gauge; The sector gear (62) and the center gear (63) are mounted on the movement base plate (66) via gear shafts, and the fixing bracket (65) presses and fixes the movement base plate (66) inside the pressure gauge case.

8. The ultra-high pressure gauge according to claim 7, characterized in that: A hairspring (631) is fitted on the gear shaft of the central gear (63), and the outer end of the hairspring (631) is fixed on the hairspring (631) support of the movement base plate (66).

9. A high-pressure gauge according to claim 8, characterized in that: The gear shafts of the sector gear (62) and the center gear (63) are supported in jewel bearings.

Images