A high-pressure gas pressure servo control and calibration measuring device

Abstract

This invention belongs to the technical field of pressure generation control and sensor calibration. It discloses a high-pressure gas pressure servo control and calibration measurement device. The device includes an inlet pipe, a pressure reducing valve, a second solenoid valve, a pressure sensor, a pressure chamber, a first solenoid valve, and a high-pressure electric servo valve. The inlet pipe is connected to the pressure reducing valve, which is connected to the first solenoid valve via a pipe. The first solenoid valve is connected to the high-pressure electric servo valve via a pipe, and the high-pressure electric servo valve is connected to the second solenoid valve via a pipe. The second solenoid valve is connected to the pressure chamber via a pipe, and the pressure sensor is connected to the pressure chamber. The pressure chamber is also used to connect a pressure sensor to be measured. This invention controls the pressure within the pressure chamber through the high-pressure electric servo valve, achieving high-precision and high-response pressure control, primarily solving the problem of the lack of real-time inflation / deflation control functionality.

Description

Technical Field

[0001] This invention belongs to the technical field of pressure generation control and sensor calibration, and more specifically, relates to a high-pressure gas pressure servo control and calibration measurement device. Background Technology

[0002] Pressure control is one of the most basic control methods, but high-precision, high-response control of high-pressure gas presents significant technical challenges. Patent CN115539836A discloses a pneumatically driven high-pressure regulating device and method. This device outputs accurate driving pressure through a rapid proportional adjustment system, and a pilot-operated pneumatically driven pressure regulating valve outputs a high-pressure gas pressure signal to achieve static pressure measurement calibration. High-pressure control plays a crucial role in the field of high-pressure sensor calibration. After prolonged operation, the accuracy of sensors can sometimes be compromised, necessitating periodic calibration to maintain their performance. Furthermore, due to the intricate internal structure of high-pressure sensors, using high-pressure gas as the calibration medium avoids clogging or contamination. Patent CN208860526U discloses a pressure gauge gas calibration device. This device pressurizes the pipeline by pushing a piston with a pressurizing handle. Two pressure gauge interfaces are located at the end of the channel for connecting a standard pressure gauge and a calibration pressure gauge, and a safety valve protects the calibration device. Patent CN209541993U discloses a gas pressure sensor calibration device, whose main components are a gas pressure source assembly, a valve controller, and a tester. The tester of this calibration device consists of a piston-equipped cylinder and an overflow valve. The piston divides the cylinder into two chambers. After the gas source pressurizes the first chamber to a certain pressure, the overflow valve in the second chamber releases gas, simulating a dynamic pressure environment to calibrate and standardize the gas pressure sensor in the second chamber.

[0003] The aforementioned high-pressure regulating devices employ a pilot-operated pressure regulation control mode, making them relatively complex and only capable of static pressure control. Furthermore, neither of the aforementioned calibration devices utilizes high-response control elements, resulting in a long system response time. Under these operating conditions, they can only perform static sensor calibration and cannot meet the requirements for dynamic sensor calibration. Additionally, if either of these calibration devices operates under high pressure for extended periods, significant gas leakage will occur, leading to a drop in pressure within the pressure chamber. Increases or decreases in the device's operating temperature, due to the expandability of gases, will cause the pressure within the pressure chamber to rise or fall. In complex operating environments, the lack of real-time gas filling and discharging control will result in inaccurate high-pressure sensor calibration. Currently, there is a gap in the field of high-precision, high-response high-pressure gas pressure control and sensor calibration devices. Summary of the Invention

[0004] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a high-pressure gas pressure servo control and calibration measurement device. It controls the pressure inside the pressure chamber through a high-pressure electric servo valve, achieving high-precision and high-response pressure control. This mainly solves the problem that existing technologies lack real-time gas filling and discharging control functions, making it impossible to dynamically adjust the pressure inside the pressure chamber, thus resulting in decreased calibration accuracy in complex calibration measurement environments.

[0005] To achieve the above objectives, according to one aspect of the present invention, a high-pressure gas pressure servo control and calibration measurement device is provided. The device includes an inlet pipe, a pressure reducing valve, a second solenoid valve, a pressure sensor, a pressure chamber, a first solenoid valve, and a high-pressure electric servo valve. The inlet pipe is connected to the pressure reducing valve, the pressure reducing valve is connected to the first solenoid valve via a pipe, the first solenoid valve is connected to the high-pressure electric servo valve via a pipe, the high-pressure electric servo valve is connected to the second solenoid valve via a pipe, the second solenoid valve is connected to the pressure chamber via a pipe, and the pressure sensor is connected to the pressure chamber. The pressure chamber is also used to connect a pressure sensor to be measured.

[0006] Furthermore, the device includes a controller, which is connected to the pressure sensor, the high-pressure electric servo valve, the first solenoid valve, and the second solenoid valve respectively; the pressure sensor is used to detect the pressure in the pressure chamber and transmit the detected pressure value to the controller; the controller is used to compare the received pressure data with the command pressure and control the high-pressure electric servo valve to perform an action according to the comparison result to realize the inflation or deflation of the pressure chamber.

[0007] Furthermore, the pressure chamber includes a piston rod, a cylinder, and an end cap, the end cap being connected to one end of the cylinder; a cavity is formed between the end cap and the cylinder, one end of the piston rod is disposed within the cylinder and is movably connected to the cylinder, and a piston is connected to one end of the piston rod disposed within the cylinder.

[0008] Furthermore, the volume of the cavity can be adjusted by moving the piston rod, with an adjustment range of 0ml to 150ml.

[0009] Furthermore, the controller controls the displacement of the piston rod to inflate or deflate the pressure chamber.

[0010] Furthermore, the high-voltage electric servo valve is equipped with a displacement sensor, which is used to detect the piston displacement in real time and transmit the detected displacement data to the controller. The controller is used to control the piston rod based on the received displacement data.

[0011] Furthermore, the second solenoid valve is used to prevent air leakage from the high-pressure electric servo valve during the air pressure maintenance period; the first solenoid valve is used to control the gas from the pressure reducing valve to enter the high-pressure electric servo valve, which is equivalent to the switch of the device.

[0012] Furthermore, the end cap is provided with a first connection hole, a second connection hole and a third connection hole. The first connection hole is used to connect a pressure sensor to measure the internal pressure of the cavity. The second connection hole is used to connect the high-pressure gas servo valve to realize the filling and discharging process of the cavity. The third connection hole is used to connect a pressure sensor to be measured.

[0013] Furthermore, the device also includes a housing, which is a shell structure. An air intake pipe, a pressure reducing valve, a second solenoid valve, a pressure sensor, a pressure chamber, a first solenoid valve, and a high-voltage electric servo valve are all disposed within the housing. The housing includes a bottom plate, side plates, and a top plate. The bottom plate is connected to one end of the side plates, and the top plate is connected to the other end of the side plates. The side plates are interconnected to form a cylindrical body. A sliding connection is formed between the top plate and the side plates.

[0014] Furthermore, the side panel of the housing is provided with an air inlet and an air outlet. Compressed gas enters the device through the air inlet on the side panel of the housing, and the air pressure signal in the pressure chamber is used to calibrate the pressure sensor under test through the air outlet. Both the side panel and the top panel of the housing are covered with transparent glass.

[0015] In summary, compared with the prior art, the high-pressure gas pressure servo control and calibration measurement device provided by the present invention has the following advantages:

[0016] 1. The device can quickly output high-precision high-pressure gas pressure signals. The device is small in size, simple in structure, and highly portable.

[0017] 2. The device, through the combination of a high-pressure electric servo valve, a controller, and a corresponding pressure sensor, can achieve high-pressure, wide-range pressure control, and the obtained gas pressure signal has fast response, low nonlinearity, high accuracy, and stable output.

[0018] 3. The device can also provide dynamic output to simulate the dynamic environment encountered by the high-pressure gas pressure sensor during detection.

[0019] 4. The device is suitable for high-pressure gas pressure control and high-precision response calibration of pressure sensors, further filling the gap in the field of high-precision, high-response high-pressure gas pressure control and sensor calibration.

[0020] 5. A second solenoid valve is installed between the high-pressure electric servo valve and the pressure chamber. When the gas pressure in the pressure chamber reaches the target pressure, the second solenoid valve is controlled to close, thus achieving a pressure-holding effect. Using the high-pressure electric servo valve for pressure holding can result in significant air leakage, leading to frequent system starts. Frequent flow of high-pressure gas in the pipeline can easily cause frost formation and ice blockage. Using the second solenoid valve for pressure holding can effectively prevent these phenomena. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a high-pressure gas pressure servo control and calibration measurement device provided by the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of a high-pressure gas pressure servo control and calibration measurement device after removing the top plate and side plate of the housing.

[0023] Figure 3 yes Figure 2 A schematic diagram of the high-pressure gas pressure servo control and calibration measurement device at another angle;

[0024] Figure 4 This is a three-dimensional schematic diagram of the high-pressure gas pressure servo control and calibration measurement device of the present invention;

[0025] Figure 5 yes Figure 4 A cross-sectional view of the pressure chamber of the high-pressure gas pressure servo control and calibration measurement device.

[0026] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 10-intake pipe, 20-pressure reducing valve, 30-second solenoid valve, 40-pressure sensor, 50-pressure chamber, 51-end cap, 52-cylinder, 53-piston rod, 60-first solenoid valve, 70-high-pressure electric servo valve, 80-bottom plate of the housing, 81-top plate of the housing, 82-side plate of the housing. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4This invention addresses the shortcomings of existing pressure regulating devices, which, due to insufficient system response speed, can only provide static calibration and cannot achieve dynamic calibration. It provides a high-precision, high-response high-pressure gas pressure servo control and calibration measurement device. This device controls the pressure within the pressure chamber 50 via a high-pressure electric servo valve 70, achieving high-precision, high-response pressure control. Specifically, the high-pressure electric servo valve 70 can rapidly output a high-precision static gas pressure signal and can simulate dynamic environments, outputting dynamic signals such as sine waves. Simultaneously, the high-pressure electric servo valve 70 overcomes the nonlinearity inherent in high-pressure pneumatic systems, enabling high-precision, high-response gas pressure output within a wide pressure variation range (35 MPa), further improving the control range and calibration capability.

[0029] The high-pressure gas pressure servo control and calibration measurement device provided by this invention includes a housing, an air inlet pipe 10, a pressure reducing valve 20, a second solenoid valve 30, a pressure sensor 40, a pressure chamber 50, a first solenoid valve 60, and a high-pressure electric servo valve 70 disposed within the housing. The air inlet pipe 10 is connected to the pressure reducing valve 20, the pressure reducing valve 20 is connected to the first solenoid valve 60 via a pipe, the first solenoid valve 60 is connected to the high-pressure electric servo valve 70 via a pipe, the high-pressure electric servo valve 70 is connected to the second solenoid valve 30 via a pipe, the second solenoid valve 30 is connected to the pressure chamber 50 via a pipe, and the pressure sensor 40 is connected to the pressure chamber 50. The device is connected to a gas supply system via the air inlet pipe 10; the pressure chamber 50 is also used to connect the pressure sensor to be measured.

[0030] The housing is a shell structure used to protect other components of the device and is easy to carry. The housing includes a bottom plate 80, side plates 82, and a top plate 81. The bottom plate 80 is connected to one end of the side plates 82, and the top plate 81 is connected to the other end of the side plates 82. The side plates 82 are interconnected to form a cylindrical body. The bottom plate 80 and the side plates 82 are connected by 18 M8 threaded holes. The side plates 82 have an air inlet and an outlet. Compressed gas enters the device through the air inlet on the side plate 82, and the high-precision air pressure signal within the pressure chamber 50 is used to calibrate the pressure sensor under test through the outlet.

[0031] The side panel 82 of the enclosure is provided with a mounting groove, and the side panel 82 is slidably connected to the top panel 81 of the enclosure through the mounting groove. This facilitates the removal of the top panel 81 for repair when a component inside the enclosure malfunctions. Both the side panel 82 and the top panel 81 are fitted with transparent glass for monitoring the operating status of the components inside the enclosure.

[0032] Please see Figure 5 The pressure chamber 50 includes a piston rod 53, a cylinder 52, and an end cap 51. The end cap 51 is connected to one end of the cylinder 52, and a sealing ring is provided between the end cap 51 and the cylinder 52. A cavity is formed between the end cap 51 and the cylinder 52. One end of the piston rod 53 is disposed inside the cylinder 52, and a movable connection is formed between the piston rod 53 and the cylinder 52. A piston is connected to one end of the piston rod 53 in the cylinder 52. Two sealing rings are provided on the piston to prevent gas leakage.

[0033] In this embodiment, the inner diameter of the cylinder 52 is 40mm, the length is 150mm, and the diameter of the piston rod 53 is 20mm. The volume of the cavity can be adjusted by moving the piston rod 53, with an adjustment range of 0ml to 150ml. The end cap 51 has three holes with a diameter of 6mm: a first connecting hole, a second connecting hole, and a third connecting hole. The first connecting hole is used to connect a pressure sensor 40 for measuring the internal pressure of the cavity. The second connecting hole is used to connect the high-pressure gas servo valve to realize the filling and discharging process of the cavity. The third connecting hole is used to connect a pressure sensor to be measured. The end cap 51 is connected to the cylinder 52 using four M5 screws.

[0034] In this embodiment, a control strategy for the high-pressure electric servo valve 70 was designed, including robust control, sliding mode control, adaptive control, and active disturbance rejection control. Through the design of the control strategy, the nonlinearity of the high-pressure gas is compensated, improving the control accuracy of the gas pressure signal within the pressure chamber 50 and the response speed of the calibration system.

[0035] A second solenoid valve 30 is installed between the high-pressure electric servo valve 70 and the pressure chamber 50. When the air pressure in the pressure chamber 50 reaches the target pressure, the second solenoid valve 30 is controlled to close, thus achieving a pressure-holding effect. Using the high-pressure electric servo valve 70 for pressure holding can result in significant air leakage, leading to frequent system starts. Frequent flow of high-pressure gas in the pipeline can easily cause frost formation and ice blockage. Using the second solenoid valve 30 for pressure holding can effectively prevent these phenomena.

[0036] The device also includes a controller, which is connected to the pressure sensor 40, the high-pressure electric servo valve 70, the first solenoid valve 60 and the second solenoid valve 30 respectively.

[0037] During operation, compressed gas from the gas supply system enters the pressure reducing valve 20 via the inlet pipe 10. The pressure reducing valve 20 reduces the pressure of the gas entering it to a stable system working pressure. Due to its mechanical structure, the pressure reducing valve 20 has negative feedback regulation, which also helps stabilize the input gas pressure. The first solenoid valve 60 controls the gas from the pressure reducing valve 20 to enter the high-pressure electric servo valve 70. It acts as a switch for the device; when energized, the device allows gas to flow, and a high-pressure signal is obtained after the gas pressure in the pressure chamber 50 stabilizes. The high-pressure electric servo valve 70 uses its piston movement to achieve the filling and emptying process of the pressure chamber 50. An internal displacement sensor detects the piston displacement in real time and controls it via a controller, forming a closed-loop displacement feedback system within the servo valve to achieve precise control of the piston position. The second solenoid valve 30 is initially in the open state and closes after the pressure chamber 50 reaches the target pressure, thus achieving a pressure-holding effect. The function of the second solenoid valve 30 is to prevent air leakage from the high-pressure electric servo valve 70 during pressure maintenance and to reduce frequent gas flow in the pipeline, which could cause frost or ice blockage. The pressure chamber 50 is connected to the pressure sensor 40 under test for high-precision, high-response calibration of the high-pressure sensor. The pressure sensor 40 provides feedback on the pressure inside the pressure chamber 50, which is compared with the command pressure in the controller to obtain the piston displacement command for the high-pressure electric servo valve 70. This control of the internal voice coil motor adjusts the piston displacement, controlling the inflation and deflation of the pressure chamber 50 to achieve high-precision, high-response control of the internal pressure signal, while also ensuring calibration accuracy and response speed during calibration measurements.

[0038] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-pressure gas pressure servo control and calibration measurement device, characterized in that: The device includes an intake pipe, a pressure reducing valve, a second solenoid valve, a pressure sensor, a pressure chamber, a first solenoid valve, and a high-pressure electro-servo valve. The intake pipe is connected to the pressure reducing valve, the pressure reducing valve is connected to the first solenoid valve via a pipe, the first solenoid valve is connected to the high-pressure electro-servo valve via a pipe, the high-pressure electro-servo valve is connected to the second solenoid valve via a pipe, the second solenoid valve is connected to the pressure chamber via a pipe, and the pressure sensor is connected to the pressure chamber. The pressure chamber is also used to connect a pressure sensor to be measured. The device includes a controller, which is connected to the pressure sensor, the high-pressure electric servo valve, the first solenoid valve, and the second solenoid valve. The pressure sensor is used to detect the pressure in the pressure chamber and transmit the detected pressure value to the controller. The controller is used to compare the received pressure data with the command pressure and control the high-pressure electric servo valve to perform actions based on the comparison result to realize the inflation or deflation of the pressure chamber. The pressure chamber includes a piston rod, a cylinder, and an end cap. The end cap is connected to one end of the cylinder. A cavity is formed between the end cap and the cylinder. One end of the piston rod is disposed within the cylinder and is movably connected to the cylinder. A piston is connected to one end of the piston rod within the cylinder. The volume of the cavity is adjusted by moving the piston rod. The second solenoid valve is used to shut off after the air pressure in the pressure chamber reaches the target pressure. The second solenoid valve is used to prevent air leakage from the high-pressure electric servo valve during the air pressure maintenance period. The first solenoid valve is used to control the gas from the pressure reducing valve to enter the high-pressure electric servo valve, which is equivalent to the switch of the device.

2. The high-pressure gas pressure servo control and calibration measurement device as described in claim 1, characterized in that: The volume of the cavity can be adjusted from 0 ml to 150 ml.

3. The high-pressure gas pressure servo control and calibration measurement device as described in claim 1, characterized in that: The high-voltage electric servo valve is equipped with a displacement sensor, which is used to detect the piston displacement in real time and transmit the detected displacement data to the controller. The controller is used to control the piston rod based on the received displacement data.

4. The high-pressure gas pressure servo control and calibration measurement device as described in claim 1, characterized in that: The end cap is provided with a first connection hole, a second connection hole and a third connection hole. The first connection hole is used to connect a pressure sensor to measure the internal pressure of the cavity. The second connection hole is used to connect the high-pressure electric servo valve to realize the inflation and deflation process of the cavity. The third connection hole is used to connect a pressure sensor to be measured.

5. The high-pressure gas pressure servo control and calibration measuring device as described in any one of claims 1-3, characterized in that: The device also includes a housing, which is a shell structure. An air intake pipe, a pressure reducing valve, a second solenoid valve, a pressure sensor, a pressure chamber, a first solenoid valve, and a high-voltage electric servo valve are all disposed within the housing. The housing includes a bottom plate, side plates, and a top plate. The bottom plate is connected to one end of the side plates, and the top plate is connected to the other end of the side plates. The side plates are interconnected to form a cylindrical body. The top plate and the side plates are slidably connected.

6. The high-pressure gas pressure servo control and calibration measurement device as described in claim 5, characterized in that: The side panel of the housing has an air inlet and an outlet. Compressed gas enters the device through the air inlet on the side panel of the housing, and the air pressure signal in the pressure chamber is used to calibrate the pressure sensor under test through the outlet. Both the side panel and the top panel of the housing are covered with transparent glass.

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