Gas-driven high-pressure regulating device and regulating method

Abstract

The present invention relates to a gas-driven high-pressure pressure regulating device and regulating method, and belongs to the field of static pressure measurement and calibration. Different from the traditional piston pressure regulating method, the present invention avoids the problem of large axial thrust on the piston caused by variable volume pressure control technology during actual high-pressure control, and can achieve precise regulation of gas pressure within the entire pressure range from low pressure to high pressure, thereby expanding the application of flow pressure control technology in gas high pressure. The device involved in the present invention is mainly composed of a gas cylinder, a pressure reducing valve, a rapid proportional regulation system, a pipeline connector, a gas volume, a pressure sensor, a tee, an air-driven regulating valve and the like. During the pressure regulation process, the present invention outputs accurate driving pressure through the rapid proportional regulation system, thereby controlling the air-driven regulating valve to output gas high pressure, thereby achieving the goal of precise pressure control.

Description

Technical Field

[0001] The present invention relates to a gas-driven high-pressure pressure regulating device and a high-pressure pressure regulating method, belonging to the field of static pressure measurement and calibration. Background Art

[0002] Pressure testing and calibration technology runs through the entire process of equipment design, development, production, use and maintenance, and is a basic means to ensure equipment performance, quality, safety, reliability and economic benefits. As an important part of pressure testing, the measurement of gas high pressure is now widely used in air pressure tests of various pressure vessels in many fields such as aviation and aerospace. It also plays a vital role in the civil industry. With the introduction of on-site calibration technology, the demand for high-pressure calibration testing is becoming more and more widespread. High-pressure instruments are used in high-pressure power systems and safety monitoring systems of high-pressure vessels. In order to ensure the safety of scientific research and production work in these fields, these high-pressure instruments need to be regularly inspected and calibrated. The accuracy of the data directly affects the smooth completion of scientific research and production. This puts higher requirements on the measurement of gas high pressure. In addition to the performance indicators of the gas high-pressure calibration device meeting the accuracy indicators required for value transfer, it must also be able to complete pressure calibration work quickly and automatically.

[0003] Currently, the most common pressure standard device is the piston pressure gauge, which is made based on the Pascal principle and the principle of static balance. It requires the loading of standard weights to generate and adjust pressure, making it difficult to achieve automatic calibration. When performing multi-point calibration on high-pressure instruments, the calibration efficiency is low. Although there are fully automatic piston pressure gauges that can automatically add weights to achieve fully automatic calibration, these piston pressure gauges are large in size, complex in structure, and expensive, making them unsuitable for on-site calibration. Piston pressure gauges are mostly liquid media. When calibrating high-pressure oil-free pressure instruments, the only way to test and calibrate is to use a liquid piston pressure gauge equipped with an oil-gas isolator. This inevitably allows oil, water, and impurities to enter, which can easily cause the gas-medium pressure instrument to rust and clog, affecting normal use.

[0004] The gas medium pressure controller is a product of the combination of sensor technology, computer technology and fluid control technology. It can quickly, accurately and stably generate the target pressure by controlling the gas. At the same time, it can realize continuous and precise control of the gas pressure through real-time feedback and display of the measured pressure through the pressure sensor.

[0005] The core technology of gas-based pressure controllers lies in precise pressure control, achieved through precise regulation of the gas flow. There are two main pressure regulation methods: flow regulation and variable volume regulation. Flow regulation adjusts gas pressure by increasing or decreasing the mass of gas in a sealed chamber. While this control method utilizes a simpler pressure control system, it places very high demands on the performance of the flow control valve, making precise pressure control at high pressures difficult. Variable volume regulation controls gas pressure by varying the volume of a fixed mass of gas within a sealed chamber through the movement of a pressure regulating piston. While this method offers high control accuracy at high pressures, it also requires a long adjustment time when the system regulates pressure over a wide range, making it unsuitable for high-pressure calibration. Consequently, traditional pressure regulation devices and methods based on a single-piston structure struggle to simultaneously address the mutually restrictive requirements of pressure control speed and resolution.

[0006] The present invention is produced under the above technical background. The present invention combines the structure of the air-driven regulating valve to achieve rapid and accurate regulation of any pressure point within the entire pressure range from low pressure to high pressure. Summary of the Invention

[0007] This invention differs from traditional piston pressure regulation methods by avoiding the problem of large axial thrust on the piston caused by variable volume pressure control technology during actual high-pressure control, and expands the application of flow pressure control technology in gas high-pressure applications. The invention discloses a gas-driven high-pressure pressure regulation device and regulation method.

[0008] The purpose of the present invention is achieved through the following technical solutions.

[0009] The present invention discloses a gas-driven high-pressure pressure regulating device, comprising a gas cylinder, a gas cylinder outlet, a pressure reducing valve, a rapid proportional regulating system, a gas container, a pressure sensor, a gas-driven regulating valve, a pipeline connector, and a tee. The gas cylinder, gas cylinder outlet, pressure reducing valve, rapid proportional regulating system, gas container, pressure sensor, and the gas-driven regulating valve are sequentially connected by the pipeline connector, and then connected to the tee, leading to a test port for connecting a pressure instrument to be calibrated.

[0010] The air-driven regulating valve includes an air-driven input port, a screw, an upper cover, a rubber sealing gasket, a lower cover, a T-shaped air-driven actuator, solid grease, a pressure-sensing cap, a wave spring, a connecting block, an O-shaped sealing gasket A, a through hole, a combined sealing gasket A, an O-shaped sealing ring B, an inverted T-shaped fixing unit, a U-shaped limiting unit, a cross valve limiting unit, a T-shaped pressing unit, an air pressure inlet, a cylindrical spring, a pressure inlet space, a cross valve, a spring base, a base, an air pressure outlet, an annular sealing gasket, a transfer column, a long through hole for the pressure outlet, a combined sealing gasket B, a triangular gap, a U-shaped gap, an exhaust hole, an O-shaped sealing ring C, and an intermediate connecting column;

[0011] An air drive input port is provided at the upper end of the upper cover; the T-shaped air drive actuator is placed in the cavity formed by the upper cover and the lower cover; the lower end of the lower cover is fixedly connected; the solid grease built into the lower cover limits the T-shaped air drive actuator to keep it vertical and provides lubrication during its up and down movement.

[0012] As a preferred solution: the lower end portion of the T-shaped gas drive execution unit is in an arc shape.

[0013] As a preferred solution: the base is provided with an air pressure inlet, an air pressure outlet and an exhaust hole; the pressure outlet includes a long through hole, one side of the long through hole is connected to the air pressure outlet, and the other side is connected to the triangular gap of the U-shaped limit unit.

[0014] As a preferred solution: the pressure-sensing cap is a "J"-shaped structure; the middle connecting column is a three-level structure with a through hole in the middle and a blind hole at the bottom; the inverted T-shaped fixing unit is provided with an inverted T-shaped structure with axial and radial through holes; the axial through hole is a secondary hole; an air duct is provided in the middle of the connecting block, and it is necessary to ensure that the air duct is connected to the axial through hole of the inverted T-shaped fixing unit; the U-shaped limiting unit is a flat U-shaped structure, and a triangular gap is formed between the bottom side wall and the base; a groove is provided upward from the bottom, and a plurality of through holes are provided upward from the groove, which are used for the passage of gas and the transfer column respectively; the T-shaped clamping unit is a hollow T-shaped structure, and the hollow part is used to install the transfer column; the lower part of the cross valve is fixedly connected to the cylindrical spring and placed inside; the wave spring is placed between the pressure-sensing cap and the connecting block.

[0015] As a preferred solution: the pressure-sensing cap has an internal threaded hole at the bottom, which is threadedly connected to the intermediate connecting column; the intermediate connecting column is inside the connecting block, and the bottom of the intermediate connecting column has an internal threaded hole, which is threadedly connected to the inverted T-shaped fixing unit; the inverted T-shaped fixing unit has an opening in the middle, and the hole groove has a sealing structure, and the opening is connected to the through hole of the connecting block and the intermediate connecting column, and the through hole is connected to the exhaust hole; the wave spring is sleeved on the intermediate connecting column and placed between the pressure-sensing cap and the connecting block; the bottom of the lower cover presses the connecting block into the base;

[0016] The pressure-sensing cap, the middle connecting column and the inverted T-shaped fixing unit move up and down synchronously along the axis direction to form a synchronous unit.

[0017] As a preferred solution: the transfer column is processed into four parts, the top is spherical, the upper part is cylindrical, the middle part is a rectangular column, and the lower part is cylindrical. The upper cylinder has a larger diameter than the lower cylinder. The spherical surface of the transfer column and the cylindrical part of the upper part pass through the circular hole in the middle of the U-shaped limiting unit and extend into the opening groove of the inverted T-shaped fixing unit. The rectangular column part of the transfer column cannot pass through the circular hole, which limits its position; the middle part and the lower part of the transfer column are both in the T-shaped clamping unit. The T-shaped clamping unit has a through hole inside and a thread outside, which is threadedly connected to the cross valve limiting unit and presses the annular sealing gasket in the cross valve limiting unit. The part of the T-shaped clamping unit except the thread is in the bottom space of the U-shaped limiting unit;

[0018] The cross valve is processed into three parts. The upper part is a conical surface with the top of the conical surface ground flat. The middle part is a platform slightly larger than the diameter of the cylindrical spring. The lower part of the cross valve can be placed in the cylindrical spring. The cylindrical spring supports the middle platform of the cross valve. The cross valve and the cylindrical spring are placed together in the spring base. The external thread of the spring base is connected to the internal thread of the cross valve limit unit. In this way, the cylindrical spring is kept in a compressed state for a long time, and the top plane of the cross valve is close to the bottom of the transfer column.

[0019] The pressure-sensing cap, the middle connecting column, the inverted T-shaped fixing unit, the U-shaped limiting unit, the transmission column, the T-shaped pressing unit, and the cross valve are sequentially inserted and connected to form an intermediate structure, which is placed in the base as a whole.

[0020] As a preferred solution: a rubber sealing gasket is placed between the upper cover and the lower cover of the air-driven regulating valve, the upper cover, the rubber sealing gasket and the lower cover are fastened by screws, and the lower cover and the base are fixed by threaded connection; the base has three threaded holes for an air pressure inlet, an air pressure outlet and an exhaust hole, and a long through hole for a pressure outlet is provided in the base, one side of which is connected to the air pressure outlet and the other side is connected to the triangular gap of the U-shaped limit unit; the triangular gap is connected to the U-shaped gap;

[0021] A rubber sealing gasket is placed between the upper cover and the lower cover of the air-driven regulating valve. The upper cover, the rubber sealing gasket and the lower cover are fastened with screws. The lower cover and the base are fixed by threaded connection. The base has three threaded holes: an air pressure inlet, an air pressure outlet and an exhaust hole. There is a long through hole for the pressure outlet in the base, one side of which is connected to the air pressure outlet and the other side is connected to the triangular gap of the U-shaped limit unit. The triangular gap is connected to the U-shaped gap.

[0022] As a preferred solution: there are three pressures in the air-driven regulating valve, the three pressures including inlet pressure, outlet pressure and exhaust pressure;

[0023] The inlet pressure is sealed by the combined sealing gasket B at the position below this; the outlet pressure is sealed at the position between the combined sealing gasket A and the combined sealing gasket B; the exhaust pressure is sealed at the position between the O-ring A and the combined sealing gasket A;

[0024] The medium flow paths of the three pressures only exist in the axial direction; the upper conical surface of the cross valve is pressed against the annular sealing gasket to form a sealing point between the inlet pressure and the outlet pressure in the axial direction, and the spherical surface of the transfer column is pressed against the sealing structure of the inverted T-shaped fixed unit opening groove to form a sealing point between the outlet pressure in the axial direction and the exhaust pressure.

[0025] The present invention also discloses a pressure regulation method, which uses gas to drive pressure to control the action of the execution unit, control the opening and closing of the cross valve, and maintain the self-balance of the synchronization unit, which specifically includes the following steps:

[0026] ①: The air drive input port and the rubber sealing gasket form a closed space, and the driving pressure P1 can be evenly applied to the rubber sealing gasket from the air drive input port; the pressure on the rubber sealing gasket is transmitted downward to the synchronization unit, and the synchronization unit moves downward. The pressure-sensitive area of ​​the T-type air drive actuator is S1, so the synchronization unit feels a downward force F1=P1S1, the elastic coefficient of the wave spring is k1, the wave spring is compressed, and the synchronization unit feels the upward reaction force of the wave spring. The cross valve overcomes the force of the cylindrical spring and moves downward, so that the upper conical surface leaves the annular sealing gasket. The gas with the inlet pressure passes through the hole of the annular sealing gasket, along the gap between the transmission column and the T-type clamping unit, filling the triangular gap and the U-shaped gap, forming an outlet pressure. The outlet pressure acts on the upward force S2 on the lower end surface of the synchronization unit, causing the synchronization unit to move upward, the cross valve moves upward, the cross valve cone re-tightens the annular sealing gasket, the inlet pressure stops entering, and the synchronization unit is finally balanced. At this time, the upward and downward forces on the synchronization unit are equal:

[0027] F1=P1 S1=k1Δx1+P2 S2 (1)

[0028] So the outlet pressure P2:

[0029]

[0030] Among them, the compression degree Δx1 of the wave spring is related to the size of P1, and the force k1Δx1 of the wave spring is much smaller than F1. It can be seen that P2 is proportional to the driving gas pressure P1. The driving gas pressure can ultimately form an outlet pressure of the air-driven regulating valve, which is related to the size of S1 / S2 and increases proportionally. The outlet pressure P2 is always less than or equal to the inlet pressure.

[0031] ②: The driving pressure P1 increases, and step ① is repeated. The synchronization unit pushes open the seal of the cross valve. After the inlet pressure re-enters, the synchronization unit forms a new balance, and the outlet pressure P2 increases and remains constant; the driving pressure P1 decreases, the synchronization unit moves upward, leaving the adjacent transfer column, and the gas at the outlet pressure enters the through hole through the opening of the inverted T-shaped fixed unit. The system is exhausted, P2 decreases, and the synchronization unit forms a new balance, and P2 stabilizes and remains constant.

[0032] The technical effects and advantages of the present invention include:

[0033] ① Combining the flow and pressure control technology currently used in the high-pressure field, while taking into account the actual use needs of pressure measurement and calibration equipment, the air-driven regulating valve structure is designed to avoid the high-pressure variable volume control technology's high requirements for the pressure regulating piston machining accuracy and motor torque.

[0034] ② Using the flow control method, a wider pressure regulation range is obtained. Compared with the variable volume regulation method, there is no need to process a longer pressure regulating cavity. The overall volume of the device can be reduced by 30%. The device is more portable and more suitable for on-site calibration.

[0035] ③ When the rapid proportional regulation system accurately controls the gas drive inlet pressure, the control speed of this device can be significantly improved compared with the traditional single-piston variable volume regulation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0037] Figure 1 This is a schematic diagram of the overall structure of the gas-driven high-pressure pressure regulating device of the present invention;

[0038] Figure 2 This is a schematic cross-sectional view of the structure of the air-driven regulating valve of the air-driven high-pressure pressure regulating device of the present invention.

[0039] In the figure: 1-air drive input port, 2-screw, 3-upper cover, 4-rubber sealing gasket, 5-lower cover, 6-T-type air drive actuator, 7-solid grease, 8-pressure sensing cap, 9-wave spring, 10-connecting block, 11-O-type sealing ring A, 12-through hole, 13-combination sealing gasket A, 14-O-type sealing ring B, 15-inverted T-type fixing unit, 16-U-type limit unit, 17-cross valve limit unit, 18-T-type clamping unit, 19-air pressure inlet, 20-cylindrical spring, 21-pressure inlet space, 22-cross valve , 23-spring base, 24-base, 25-air pressure outlet, 26-annular sealing gasket, 27-transfer column, 28-long through hole for pressure outlet, 29-combination sealing gasket B, 30-triangular gap, 31-U-shaped gap, 32-exhaust hole, 33-O-ring C, 34-middle connecting column, 35-gas cylinder, 36-gas cylinder outlet, 37-pressure reducing valve, 38-rapid proportional adjustment system, 39-gas drive pressure regulating device, 40-pipeline connector, 41-gas capacity, 42-pressure sensor, 43-tee, 44-test port. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions of this application in conjunction with the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0041] The specific embodiment of the gas driven high pressure regulating device of the present invention is shown in Figure 1 and Figure 2 As shown, the gas-driven high-pressure pressure regulating device includes a gas cylinder (35), a gas cylinder outlet (36), a pressure reducing valve (37), a rapid proportional regulating system (38), a gas container (41), a pressure sensor (42), and a gas-driven regulating valve (39), which are sequentially connected by a pipe connector (40) and then lead to a test port (44) through a tee (43) for connecting to a pressure instrument to be calibrated;

[0042] An air-driven regulating valve comprises an air-driven input port (1), a screw (2), an upper cover (3), a rubber sealing gasket (4), a lower cover (5), a T-shaped air-driven actuator unit (6), solid grease (7), a pressure-sensing cap (8), a wave spring (9), a connecting block (10), an O-shaped sealing ring A (11), a through hole (12), a combined sealing gasket A (13), an O-shaped sealing ring B (14), an inverted T-shaped fixing unit (15), a U-shaped limiting unit (16), a cross valve limiting unit (17), a T-shaped pressing unit (18), an air pressure inlet (19), a cylindrical spring (20), a pressure inlet space (21), a cross valve (22), a spring base (23), a base (24), an air pressure outlet (25), an annular sealing gasket (26), a transfer column (27), a pressure outlet long through hole (28), a combined sealing gasket B (29), a triangular gap (30), a U-shaped gap (31), an exhaust hole (32), an O-shaped sealing ring C (33), and an intermediate connecting column (34);

[0043] A rubber sealing gasket (4) is placed between the upper cover (3) and the lower cover (5) of the air-driven regulating valve, and the upper cover (3), the rubber sealing gasket (4) and the lower cover (5) are fastened by screws (2). The lower cover (5) and the base (24) are fixed by threaded connection; the base has three threaded holes, namely, an air pressure inlet (19), an air pressure outlet (25) and an exhaust hole (32); a long through hole (28) for pressure outlet is provided in the base (24), one side of which is connected to the air pressure outlet (25) and the other side is connected to the triangular gap (30) and the U-shaped gap (31) of the U-shaped limiting unit (16);

[0044] The solid grease (7) built into the lower cover (5) limits the T-shaped air drive actuator (6) to keep it vertical and provides lubrication during its up and down movement;

[0045] The pressure sensing cap (8), the intermediate connecting column (34), the wave spring (9), the connecting block (10), the inverted T-shaped fixing unit (15), the U-shaped limiting unit (16), the T-shaped pressing unit (18), the cross valve limiting unit (17), the cross valve (22), the transmission column (27), the cylindrical spring (20), and the spring base (23) are coaxial and all located in the base (24); the pressure sensing cap (8) has an internal threaded hole at the bottom, which is threadedly connected to the intermediate connecting column (34); the intermediate connecting column (34) is connected to the connecting block (10 ), the bottom of the middle connecting column (34) has an internal threaded hole, which is threadedly connected to the inverted T-shaped fixing unit (15); the middle of the inverted T-shaped fixing unit (15) has an opening, and the hole groove has a sealing structure, and the opening is connected to the through hole (12) of the connecting block (10) and the middle connecting column (34), and the through hole (12) is connected to the exhaust hole (32); the wave spring (9) is sleeved on the middle connecting column (34) and placed between the pressure-sensing cap (8) and the connecting block (10); the bottom of the lower cover (5) presses the connecting block (10) into the base (24);

[0046] The pressure-sensing cap (8), the middle connecting column (34) and the inverted T-shaped fixing unit (15) move up and down synchronously along the axis direction to form a synchronous unit;

[0047] The transfer column (27) is processed into four parts, the top is a spherical surface, the upper part is a cylinder, the middle part is a rectangular column, and the lower part is a cylinder. The upper cylinder has a larger diameter than the lower cylinder. The spherical surface of the transfer column (27) and the cylindrical part of the upper part pass through the circular hole in the middle of the U-shaped limiting unit (16) and extend into the opening groove of the inverted T-shaped fixing unit (15). The rectangular column part of the transfer column (27) cannot pass through the circular hole, so it is limited; the middle part and the lower part of the transfer column (27) are both in the T-shaped pressing unit (18). The T-shaped pressing unit (18) has a through hole inside and a thread outside, which is threadedly connected to the cross valve limiting unit (17) and presses the annular sealing gasket (26) in the cross valve limiting unit (17). The part of the T-shaped pressing unit (18) except the thread is in the bottom space of the U-shaped limiting unit (16);

[0048] The cross valve (22) is processed into three parts, the upper part is a conical surface, the top of the conical surface is ground flat, and the middle part is a platform slightly larger than the diameter of the cylindrical spring (20). The lower part of the cross valve (22) can just be placed in the cylindrical spring (20), and the cylindrical spring (20) supports the middle platform of the cross valve (22). The cross valve (22) and the cylindrical spring (20) are placed together in the spring base (23). The external thread of the spring base (23) is connected to the internal thread of the cross valve limit unit (17). In this way, the cylindrical spring (20) is in a compressed state for a long time, and the top plane of the cross valve (22) is close to the bottom of the transfer column (27);

[0049] There are three kinds of pressure in the air-driven regulating valve, namely inlet pressure, outlet pressure and exhaust pressure. Due to their respective sealing structures, they only exist in limited positions and passages. The inlet pressure is sealed by the combined sealing gasket B (29) at the position below this; the outlet pressure is sealed at the position between the combined sealing gasket A (13) and the combined sealing gasket B (29); the exhaust pressure is sealed at the position between the O-ring A (11) and the combined sealing gasket A (13). The medium flow passages of the three pressures only exist in the axial direction; the upper conical surface of the cross valve (22) is pressed against the annular sealing gasket (26), forming a sealing point between the inlet pressure and the outlet pressure in the axial direction, and the spherical surface of the transfer column (27) is pressed against the sealing structure of the opening groove of the inverted T-shaped fixed unit (15), forming a sealing point between the outlet pressure and the exhaust pressure in the axial direction;

[0050] The main function of the gas cylinder (35) is to store a pressure of about 14 MPa and provide an initial gas source for the entire device;

[0051] The main function of the gas cylinder outlet (36) is to directly provide a high-pressure inlet gas source of about 14 MPa to the gas drive regulating valve;

[0052] The main function of the pressure reducing valve (37) is to reduce the high pressure of the gas cylinder to 1 MPa and provide pressure for the rapid proportional regulation system;

[0053] The main function of the rapid proportional regulation system (38) is to quickly adjust the 1MPa gas source pressure to any pressure of (0-800)kPa by using the proportional regulation method, and provide accurate driving gas pressure for the gas drive regulating valve;

[0054] The main functions of the pipeline connector (40) are: connecting to the gas container, pressure sensor, etc.

[0055] The main functions of the gas container (41) are: containing gas and pressure buffering;

[0056] The main functions of the pressure sensor (42) are: collecting and feeding back the current pressure in real time;

[0057] The main functions of the tee (43) are: connecting the pipeline connector and dividing the pipeline into two;

[0058] The main function of the test port (44) is to connect the pressure instrument to be calibrated.

[0059] The pressure regulation method based on the gas-driven high-pressure pressure regulating device is a pressure regulation method that controls the action of the gas-driven pressure control execution unit, controls the opening and closing of the cross valve (22), and maintains the self-balance of the synchronous unit to ensure constant output:

[0060] First, let's take the example of a driving pressure P1 = 450kPa, which can be evenly applied to the rubber gasket from the air drive input port. The pressure on the rubber gasket is transmitted downward to the synchronization unit, which moves downward. The pressure-sensitive area of ​​the T-type air drive actuator is S1 = 3.1cm2, so the synchronization unit feels a downward force F1 = P1S1. The wave spring (elastic coefficient is k1) is compressed, and the synchronization unit feels the upward reaction force of the wave spring. The cross valve overcomes the force of the cylindrical spring and moves downward, causing the upper conical surface to leave the annular gasket. The gas at the inlet pressure passes through the hole of the annular gasket, along the gap between the transmission column and the T-type clamping unit, filling the triangular gap and the U-shaped gap, forming an outlet pressure. The outlet pressure acts on the lower end surface of the synchronization unit S2 = 63.6cm 2 The upward force causes the synchronization unit to move upward, and the cross valve to move upward. The cross valve cone re-tightens the annular seal, and the inlet pressure stops entering. Finally, the synchronization unit is balanced, and the upward and downward forces on the synchronization unit are equal:

[0061] F1=P1 S1=k1Δx1+P2 S2 (1)

[0062] So the outlet pressure P2:

[0063]

[0064] Among them, the compression degree of the wave spring Δx1Δx1 is equal to P1, and the force k1Δx1 of the wave spring is much smaller than F1. P2 is proportional to the driving gas pressure P1 and is related to P2. After calculation, it is about 20 times the multiplied pressure. The outlet pressure P2 is about 9MPa, which is always less than the inlet pressure of 14MPa.

[0065] Furthermore, the driving pressure P1 increases to 600kPa, and the previous step is repeated. The synchronization unit pushes open the seal of the cross valve. After the inlet pressure of 14MPa re-enters, the synchronization unit forms a new balance, and the outlet pressure P2 increases to about 12MPa and remains constant; the driving pressure P1 decreases to 300kPa, and the synchronization unit moves upward, leaving the adjacent transfer column. The gas at the outlet pressure enters the through hole through the opening of the inverted T-shaped fixed unit, the system is exhausted, P2 decreases, and the synchronization unit forms a new balance. P2 stabilizes at about 6MPa and remains constant.

[0066] Based on the pressure regulation method of the gas-driven high-pressure pressure regulating device, when the current pressure of 6MPa is less than the target pressure value of 12MPa, the operation process is as follows:

[0067] The specific driving pressure value required by the calculation needs to be around 600kPa. To prevent control overshoot, the driving pressure is appropriately lower than the calculated value. The rapid proportional adjustment system works to increase the output driving pressure and stabilize it at 580kPa. The air drive regulating valve works in a self-balancing manner. The pressure outlet outputs more high-pressure gas to the gas container, and the gas container pressure increases. The pressure sensor feeds back the current pressure in real time, which is 0.5MPa different from the target pressure value of 12MPa.

[0068] Next, slowly increase the driving pressure by 25 kPa and repeat the previous step to increase the system pressure until the current pressure fed back equals the target pressure value.

[0069] Based on the pressure regulation method of the gas-driven high-pressure pressure regulating device, when the current pressure of 12MPa is greater than the target pressure value of 5MPa, the operation process is as follows:

[0070] First, the required specific driving pressure value of about 250kPa is calculated to prevent control callback. The rapid proportional adjustment system works to reduce the output driving pressure to about 280kPa. The air drive regulating valve works, the system pressure is discharged, the air volume pressure is reduced, and the pressure sensor feeds back the current pressure in real time, which is about 0.3MPa different from the target pressure value.

[0071] Furthermore, the driving pressure is slightly adjusted downward by about 20 kPa, and the air drive regulating valve repeats the previous step, and the system continues to exhaust until it reaches the target pressure value of 5 MPa.

[0072] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application. Other structures and principles are the same as those in the prior art and will not be repeated here.

Claims

1. A gas-driven high-pressure pressure regulating device, characterized in that: It includes a gas cylinder, a gas cylinder outlet, a pressure reducing valve, a rapid proportional adjustment system, a gas container, a pressure sensor, a gas drive regulating valve, a pipe connector, and a tee. The gas cylinder, gas cylinder outlet, pressure reducing valve, rapid proportional adjustment system, gas container, pressure sensor, and the gas drive regulating valve are sequentially connected with the pipe connector and then connected to the tee, leading to a test port for connecting the pressure instrument to be calibrated. The air-driven regulating valve includes an air-driven input port, a screw, an upper cover, a rubber sealing gasket, a lower cover, a T-shaped air-driven actuator, solid grease, a pressure-sensing cap, a wave spring, a connecting block, an O-shaped sealing ring A, a through hole, a combined sealing gasket A, an O-shaped sealing ring B, an inverted T-shaped fixing unit, a U-shaped limiting unit, a cross valve limiting unit, a T-shaped pressing unit, an air pressure inlet, a cylindrical spring, a pressure inlet space, a cross valve, a spring base, a base, an air pressure outlet, an annular sealing gasket, a transfer column, a long through hole for the pressure outlet, a combined sealing gasket B, a triangular gap, a U-shaped gap, an exhaust hole, an O-shaped sealing ring C, and an intermediate connecting column; The pressure-sensing cap is a "J"-shaped structure; the middle connecting column is a three-level structure with a through hole in the middle and a blind hole at the bottom; the inverted T-shaped fixing unit is provided with an inverted T-shaped structure with an axial through hole and a radial through hole; the axial through hole is a secondary hole; an airway is provided in the middle of the connecting block, and it is necessary to ensure that the airway is connected to the axial through hole of the inverted T-shaped fixing unit; the U-shaped limiting unit is a flat U-shaped structure, and a triangular gap is formed between the side wall of the bottom end and the base; a groove is provided upwards from the bottom end, and a plurality of through holes are provided upwards from the groove, which are respectively used for the passage of gas and the transfer column; the T-shaped clamping unit is a hollow T-shaped structure, and the hollow part is used to install the transfer column; the lower part of the cross valve is fixedly connected to the cylindrical spring and is placed in the pressure inlet space; the wave spring is placed between the pressure-sensing cap and the connecting block; The pressure-sensing cap has an internal threaded hole at the bottom, which is threadedly connected to the intermediate connecting column; the intermediate connecting column is inside the connecting block, and the bottom of the intermediate connecting column has an internal threaded hole, which is threadedly connected to the inverted T-shaped fixing unit; the inverted T-shaped fixing unit has an opening in the middle, and the hole groove has a sealing structure, and the opening is connected to the through hole of the connecting block and the intermediate connecting column, and the through hole is connected to the exhaust hole; the wave spring is sleeved on the intermediate connecting column and placed between the pressure-sensing cap and the connecting block; the bottom of the lower cover presses the connecting block into the base; The pressure-sensing cap, the middle connecting column and the inverted T-shaped fixing unit move synchronously up and down along the axis direction to form a synchronous unit; An air drive input port is provided at the upper end of the upper cover; the T-shaped air drive actuator is placed in a cavity formed by the upper cover and the lower cover; the lower end of the lower cover is fixedly connected with a screw; solid grease built into the lower cover limits the T-shaped air drive actuator to keep it vertical and provides lubrication during its up and down movement; The base is provided with an air pressure inlet, an air pressure outlet and an exhaust hole; one side of the pressure outlet long through hole is connected to the air pressure outlet, and the other side is connected to the triangular gap of the U-shaped limiting unit.

2. The gas-driven high-pressure pressure regulating device according to claim 1, characterized in that: The lower end portion of the T-shaped gas drive execution unit is in an arc shape.

3. The gas-driven high-pressure pressure regulating device according to claim 1, characterized in that: The transfer column is processed into four parts, the top is spherical, the upper part is cylindrical, the middle part is a rectangular column, and the lower part is cylindrical. The upper cylinder has a larger diameter than the lower cylinder. The spherical surface of the transfer column and the cylindrical part of the upper part pass through the circular hole in the middle of the U-shaped limiting unit and extend into the open hole groove of the inverted T-shaped fixing unit. The rectangular column part of the transfer column cannot pass through the circular hole, which limits its position; the middle part and the lower part of the transfer column are both in the T-shaped clamping unit, and the T-shaped clamping unit has a through hole inside and a thread outside, which is threadedly connected to the cross valve limiting unit and presses the annular sealing gasket in the cross valve limiting unit. The part of the T-shaped clamping unit except the thread is in the bottom space of the U-shaped limiting unit; The cross valve is processed into three parts. The upper part is a conical surface with the top of the conical surface ground flat. The middle part is a platform slightly larger than the diameter of the cylindrical spring. The lower part of the cross valve can be placed in the cylindrical spring. The cylindrical spring supports the middle platform of the cross valve. The cross valve and the cylindrical spring are placed together in the spring base. The external thread of the spring base is connected to the internal thread of the cross valve limit unit. In this way, the cylindrical spring is kept in a compressed state for a long time, and the top plane of the cross valve is close to the bottom of the transfer column. The pressure-sensing cap, the middle connecting column, the inverted T-shaped fixing unit, the U-shaped limiting unit, the transmission column, the T-shaped pressing unit, and the cross valve are sequentially inserted and connected to form an intermediate structure, which is placed in the base as a whole.

4. The gas-driven high-pressure pressure regulating device according to claim 1, characterized in that: A rubber sealing gasket is placed between the upper cover and the lower cover of the air-driven regulating valve, and the upper cover, the rubber sealing gasket and the lower cover are fastened with screws, and the lower cover and the base are fixed by threaded connection; the base has three threaded holes for an air pressure inlet, an air pressure outlet and an exhaust hole, and a long through hole for a pressure outlet is provided in the base, one side of which is connected to the air pressure outlet and the other side is connected to the triangular gap of the U-shaped limit unit; the triangular gap is connected to the U-shaped gap.

5. The gas-driven high-pressure pressure regulating device according to claim 4, characterized in that: There are three pressures in the air drive regulating valve, including inlet pressure, outlet pressure and exhaust pressure; The inlet pressure is sealed by the combined sealing gasket B at the position below this; the outlet pressure is sealed at the position between the combined sealing gasket A and the combined sealing gasket B; the exhaust pressure is sealed at the position between the O-ring A and the combined sealing gasket A; The medium flow paths of the three pressures only exist in the axial direction; the upper conical surface of the cross valve is pressed against the annular sealing gasket to form a sealing point between the inlet pressure and the outlet pressure in the axial direction, and the spherical surface of the transfer column is pressed against the sealing structure of the inverted T-shaped fixed unit opening groove to form a sealing point between the outlet pressure in the axial direction and the exhaust pressure.

6. A pressure regulation method, implemented based on the gas-driven high-pressure pressure regulating device according to claim 1, characterized in that: The gas-driven pressure control actuator is used to control the opening and closing of the cross valve and maintain the self-balance of the synchronization unit. The specific steps include: ①: The air drive input port and the rubber sealing gasket form a closed space, and the driving pressure P1 can be evenly applied to the rubber sealing gasket from the air drive input port; the pressure on the rubber sealing gasket is transmitted downward to the synchronization unit, and the synchronization unit moves downward. The pressure-sensitive area of ​​the T-type air drive actuator is S1, so the synchronization unit feels a downward force F1=P1S1, the elastic coefficient of the wave spring is k1, the wave spring is compressed, and the synchronization unit feels the upward reaction force of the wave spring. The cross valve overcomes the force of the cylindrical spring and moves downward, so that the upper conical surface leaves the annular sealing gasket. The gas with the inlet pressure passes through the hole of the annular sealing gasket, along the gap between the transmission column and the T-type clamping unit, filling the triangular gap and the U-shaped gap, forming an outlet pressure. The outlet pressure acts on the upward force S2 on the lower end surface of the synchronization unit, causing the synchronization unit to move upward, the cross valve moves upward, the cross valve cone re-tightens the annular sealing gasket, the inlet pressure stops entering, and the synchronization unit is finally balanced. At this time, the upward and downward forces on the synchronization unit are equal: F1= P1 S1= k1Δx1+ P2 S2 (1) So the outlet pressure P2: Among them, the compression degree Δx1 of the wave spring is related to the size of P1, and the force k1Δx1 of the wave spring is much smaller than F1. It can be seen that P2 is proportional to the driving gas pressure P1. The driving gas pressure can ultimately form an outlet pressure of the air-driven regulating valve, which is related to the size of S1 / S2 and increases proportionally. The outlet pressure P2 is always less than or equal to the inlet pressure. ②: The driving pressure P1 increases, and step ① is repeated. The synchronization unit pushes open the seal of the cross valve. After the inlet pressure re-enters, the synchronization unit forms a new balance, and the outlet pressure P2 increases and remains constant; the driving pressure P1 decreases, the synchronization unit moves upward, leaving the adjacent transfer column, and the gas at the outlet pressure enters the through hole through the opening of the inverted T-shaped fixed unit. The system is exhausted, P2 decreases, and the synchronization unit forms a new balance, and P2 stabilizes and remains constant.

Images