A pressure calibration device for instrument equipment

Abstract

The present invention relates to the field of pressure calibration technology, and specifically to a pressure calibration device for instrument equipment, including a liquid storage tank and a pipeline, wherein the output end of the liquid storage tank is connected to a high-pressure pump, a pressure regulating valve, a pressure sensor 1 and a three-way valve in sequence through the pipeline, and the two outlet ends of the three-way valve are respectively connected to a standard pressure gauge and a pressure sensor 2 and a pressure gauge to be tested and a pressure sensor 3 through two pipelines, and the two pipelines are finally connected to the input end of the liquid storage tank; pressure attenuation compensation modules are provided at the two outlet ends of the three-way valve, and the pressure attenuation compensation module is used to reduce the pressure fluctuation in the pipeline. Compared with the traditional method, the technical solution uses a pressure calibration device, a pressure calibration method and an electronic device to calibrate the pressure gauge to be tested, which not only effectively improves the accuracy of the pressure gauge when calibrating, but also optimizes the reliability and stability of the calibration device.

Description

Technical Field

[0001] The invention relates to the technical field of pressure calibration, and in particular to a pressure calibration device for instrument equipment. Background Art

[0002] As an instrument for measuring pressure, pressure gauge is one of the commonly used instrument equipment. It is required to be used in the daily work of related industries. There are certain usage specifications for pressure gauges, and they need to be calibrated within a certain usage cycle to ensure the accuracy of the measurement results.

[0003] The patent document with patent announcement number: CN118010247A discloses an automatic pressure calibration system and a calibration method thereof, wherein the automatic pressure calibration system comprises an air compressor, an air pipe, and a calibration table, wherein the air compressor is provided with a pressure indicator, a pressure adjustment knob, a pressure output port, a status indicator light, and a switch, and the calibration table comprises a table body, an air inlet, a return check valve, a first output port, a second output port, a third output port, a pre-pressure valve, a stop valve, and a pressure regulating valve, wherein one end of the air pipe is connected to the pressure output port of the air compressor, and the other end is connected to the air inlet of the calibration table, wherein the automatic pressure calibration system adopts an air compressor to provide a pressure source, reduces the work intensity, and converts the output pressure of the air compressor into oil pressure through the calibration table, which is stable and reliable, and adopts three output ports to realize the calibration of two pressure gauges at the same time, thereby improving work efficiency, and the calibration method clarifies the calibration steps in the calibration process, avoids deviations in the calibration results caused by improper operation, and ensures the accuracy of the calibration results.

[0004] The above scheme can calibrate two pressure gauges at the same time by designing three output ports, but since there is no standard pressure gauge as a standard for measuring pressure test, the accuracy of the two pressure gauges cannot be verified. Moreover, since two pressure gauges are calibrated at the same time, the pressure value passing through the pressure gauge will inevitably be attenuated due to factors such as friction on the inner wall of the pipeline and compressibility of the medium, further exacerbating the inaccuracy of the pressure calibration of this scheme. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the purpose of the present invention is to provide a pressure calibration device for instrument equipment, a pressure calibration method for instrument equipment and an electronic device to improve the accuracy of calibrating a pressure gauge.

[0006] To achieve the above-mentioned purpose, the first embodiment of the present invention proposes a pressure calibration device for instrument equipment, comprising a liquid storage tank and a pipeline, wherein the output end of the liquid storage tank is connected to a high-pressure pump, a pressure regulating valve, a pressure sensor 1 and a three-way valve in sequence through the pipeline, and the two outlet ends of the three-way valve are respectively connected to a standard pressure gauge and a pressure sensor 2 and a pressure gauge to be tested and a pressure sensor 3 through two pipelines, and the two pipelines are finally connected to the input end of the liquid storage tank;

[0007] Pressure decay compensation modules are provided at both outlet ends of the three-way valve, and the pressure decay compensation modules are used to reduce pressure fluctuations in the pipeline.

[0008] In some embodiments of the present invention, an overpressure protection valve is provided between the pipeline corresponding to the pressure sensor 1 and the three-way valve.

[0009] In some embodiments of the present invention, the pipeline is a double-layer pipeline, including an outer tube and an inner tube, the outer tube and the inner tube are connected with a support member at intervals, and the cavity space between the outer tube and the inner tube is filled with a polymer composite material.

[0010] In some embodiments of the present invention, the pressure decay compensation module includes a pressure monitor 1, a pressure monitor 2, a variable frequency electric plunger pump and an adjustment mechanism, wherein the pressure monitor 1 and the pressure monitor 2 are respectively arranged inside the inner tube and in the cavity space between the outer tube and the inner tube, the variable frequency electric plunger pump connects the outlet end of the three-way valve with the output end of the liquid storage tank through a pipeline, and the connection between the outer tube and the inner tube and the outer wall of the outer tube are both provided with an adjustment mechanism;

[0011] The first pressure monitor is electrically connected to the variable frequency electric plunger pump, and the second pressure monitor is electrically connected to the regulating mechanism.

[0012] In some embodiments of the present invention, the regulating mechanism is a piston or a diaphragm.

[0013] To achieve the above object, a second embodiment of the present invention provides a pressure calibration method for instrument equipment, which is applied to the above pressure calibration device. The pressure calibration method includes the following steps:

[0014] First, the high-pressure pump draws out the pressure medium in the liquid storage tank and passes through the pressure regulating valve, pressure sensor 1 and overpressure protection valve through the pipeline to enter the three-way valve. The pressure regulating valve is adjusted according to the real-time data of pressure sensor 1 to achieve precise control of the output pressure.

[0015] Then, the outlet end of the three-way valve connected to the pressure gauge to be tested is closed, and the outlet end of the three-way valve connected to the standard pressure gauge is opened, and the pressure medium passes through the pipeline, passes through the standard pressure gauge and the second pressure sensor in sequence, and enters the liquid storage tank. Combining the real-time data of the second pressure sensor and the reading of the standard pressure gauge, the computer program reads the reading of the standard pressure gauge as the standard value;

[0016] Then, the outlet end of the three-way valve connected to the pressure gauge to be tested is opened, and the outlet end of the three-way valve connected to the standard pressure gauge is closed. The pressure medium passes through the pressure gauge to be tested and the pressure sensor 3 in turn into the liquid storage tank through the pipeline. Combining the real-time data of the pressure sensor 3 and the reading of the pressure gauge to be tested, the computer program reads the reading of the pressure gauge to be tested, and compares it with the above standard value to calculate the error.

[0017] During the above-mentioned verification process, pressure monitor 1 and pressure monitor 2 in the pressure attenuation compensation module continuously monitor the pressure inside the inner tube and in the cavity space between the outer tube and the inner tube. When the pressure fluctuation is greater than the preset range, pressure monitor 1 sends a signal to the variable frequency electric plunger pump, and the variable frequency electric plunger pump controls the liquid storage tank to transport the pressure transmission medium to the inner tube according to the required pressure to achieve the specified pressure. According to the signal of pressure monitor 2, the adjustment mechanism will adjust the pressure in the cavity space between the outer tube and the inner tube to balance the pressure difference between the outer tube and the inner tube.

[0018] To achieve the above-mentioned purpose, a third aspect of the present invention proposes an electronic device, comprising a memory, a processor and a computer program stored in the memory, wherein when the computer program is executed by the processor, the above-mentioned pressure calibration method is implemented.

[0019] Beneficial effects of the present invention:

[0020] Compared with the traditional method, this technical solution calibrates the pressure gauge to be inspected through a pressure calibration device, a pressure calibration method and electronic equipment, which not only effectively improves the accuracy of the pressure gauge calibration, but also optimizes the reliability and stability of the calibration device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 It is an overall framework diagram of an embodiment of the present invention;

[0023] Figure 2 is a three-dimensional view of a pipeline according to an embodiment of the present invention;

[0024] Figure 3 is a flow chart of a pressure calibration method according to another embodiment of the present invention;

[0025] Figure 4It is a schematic structural diagram of an electronic device according to another embodiment of the present invention.

[0026] In the figure: 1. Liquid storage tank; 11. High-pressure pump; 12. Pressure regulating valve; 13. Pressure sensor 1; 14. Overpressure protection valve; 15. Three-way valve; 16. Standard pressure gauge; 17. Pressure sensor 2; 18. Pressure gauge to be tested; 19. Pressure sensor 3; 2. Pipeline; 21. Outer pipe; 22. Inner pipe; 23. Support; 3. Pressure attenuation compensation module. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, a pressure calibration device for instrument equipment includes a liquid storage tank 1 and a pipeline 2. The liquid storage tank 1 stores a pressure transmission medium, such as special hydraulic oil. The output end of the liquid storage tank 1 is connected to a high-pressure pump 11, a pressure regulating valve 12, a pressure sensor 1 13 and a three-way valve 15 in sequence through a pipeline 2. The two outlet ends of the three-way valve 15 are respectively connected to a standard pressure gauge 16 and a pressure sensor 2 17 and a pressure gauge to be tested 18 and a pressure sensor 3 19 through two pipelines 2. The two pipelines 2 are finally connected to the input end of the liquid storage tank 1; the standard pressure gauge 16 is a high-precision and high-stability pressure gauge, which is used to provide a standard pressure value during the calibration process. Pressure attenuation compensation modules 3 are provided at both outlet ends of the three-way valve 15, and the pressure attenuation compensation modules 3 are used to reduce pressure fluctuations in the pipeline 2.

[0029] Compared with the traditional solution, the pressure calibration device is equipped with a standard pressure gauge 16 as a guarantee before calibrating the pressure gauge 18 to be tested, and determines the standard value of the pressure calibration of the pressure gauge 18 to be tested. At the same time, by setting the pressure attenuation compensation module 3, the pressure fluctuation in the pipeline 2 is effectively reduced, and the accuracy of the calibration is further improved.

[0030] In some embodiments of the present invention, an overpressure protection valve 14 is provided between the pipeline 2 corresponding to the pressure sensor 13 and the three-way valve 15. When the pressure in the pipeline 2 exceeds the set value, the overpressure protection valve 14 automatically opens to release excess pressure and protect the safety of the device.

[0031] like Figure 2As shown, in some embodiments of the present invention, the pipeline 2 is a double-layer pipeline, including an outer tube 21 and an inner tube 22, and a support member 23 is connected between the outer tube 21 and the inner tube 22. The cavity space between the outer tube 21 and the inner tube 22 is filled with a polymer composite material. Polymer composite materials, such as Handyco polymer composite materials, have been widely used in pipeline pressure plugging and show good sealing and pressure resistance properties.

[0032] In some embodiments of the present invention, the pressure attenuation compensation module 3 includes a pressure monitor 1, a pressure monitor 2, a variable frequency electric plunger pump and an adjusting mechanism, and the adjusting mechanism is a piston or a diaphragm; wherein, the pressure monitor 1 and the pressure monitor 2 are respectively arranged inside the inner tube 22 and in the cavity space between the outer tube 21 and the inner tube 22, and the variable frequency electric plunger pump connects the outlet end of the three-way valve 15 with the output end of the liquid storage tank 1 through the pipeline 2, and the connection between the outer tube 21 and the inner tube 22 and the outer wall of the outer tube 21 are both provided with an adjusting mechanism; the pressure monitor 1 is electrically connected to the variable frequency electric plunger pump, and the pressure monitor 2 is electrically connected to the adjusting mechanism.

[0033] Corresponding to the above-mentioned pressure calibration device, such as Figure 3 As shown, the present invention also provides a pressure calibration method for instrument equipment, the pressure calibration method comprising the following steps:

[0034] S1, the high-pressure pump 11 extracts the pressure medium in the liquid storage tank 1, and passes through the pipeline 2, the pressure regulating valve 12, the pressure sensor 13 and the overpressure protection valve 14 in turn to enter the three-way valve 15, and adjusts the pressure regulating valve 12 according to the real-time data of the pressure sensor 13 to achieve accurate control of the output pressure;

[0035] S2, the outlet end of the three-way valve 15 connected to the pressure gauge 18 to be tested is closed, and the outlet end of the three-way valve 15 connected to the standard pressure gauge 16 is opened, and the pressure medium passes through the pipeline 2, passes through the standard pressure gauge 16 and the second pressure sensor 17 in sequence and enters the liquid storage tank 1. Combining the real-time data of the second pressure sensor 17 and the reading of the standard pressure gauge 16, the computer program reads the reading of the standard pressure gauge 16 as the standard value;

[0036] S3, the outlet end of the three-way valve 15 connected to the pressure gauge 18 to be tested is opened, and the outlet end of the three-way valve 15 connected to the standard pressure gauge 16 is closed, and the pressure medium passes through the pressure gauge 18 to be tested and the pressure sensor 3 19 in turn through the pipeline 2 and enters the liquid storage tank 1. Combining the real-time data of the pressure sensor 3 19 and the reading of the pressure gauge 18 to be tested, the computer program reads the reading of the pressure gauge 18 to be tested, and compares it with the above standard value, calculates the error, and determines whether the pressure gauge 18 to be tested is calibrated and qualified;

[0037] S4. During the above verification process, the pressure monitor 1 and the pressure monitor 2 in the pressure decay compensation module 3 continuously monitor the pressure inside the inner tube 22 and the pressure in the cavity space between the outer tube 21 and the inner tube 22. The following situations exist:

[0038] When the pressure fluctuation is greater than the preset range, the pressure monitor sends a signal to the variable frequency electric piston pump, and the variable frequency electric piston pump controls the liquid storage tank to transport the pressure transmission medium to the inner tube 22 according to the required pressure to achieve the specified pressure.

[0039] When the pressure monitor 2 detects the pressure change of the outer tube 21, the regulating mechanism receives the signal and performs corresponding actions to adjust the pressure in the outer tube 21. If the pressure of the inner tube 22 decreases and the pressure of the outer tube 21 is relatively too high, the regulating mechanism will appropriately reduce the pressure of the outer tube 21; conversely, if the pressure of the inner tube 22 increases and the pressure of the outer tube 21 is relatively too low, the regulating mechanism will appropriately increase the pressure of the outer tube 21 to balance the pressure difference between the outer tube 21 and the inner tube 22.

[0040] It should be noted that balancing the pressure difference between the inner tube 22 and the outer tube 21 is of great significance for achieving pressure decay compensation of the inner tube 22, because:

[0041] When the fluid pressure in the inner tube 22 changes, if the outer tube 21 can respond quickly and adjust its internal pressure to balance the pressure in the inner tube 22, the pressure fluctuation in the inner tube 22 will be significantly reduced, and the accuracy of the pressure gauge 18 to be inspected will be higher. This balancing effect also helps to stabilize the pressure environment of the inner tube 22, ensuring that the pipeline system can operate continuously and efficiently, and preventing safety problems such as pipeline rupture and leakage caused by rapid changes in pressure;

[0042] Moreover, if the pressure difference between the inner and outer pipes is too large, the risk of leakage in weak links such as pipe joints and welds will increase. By balancing the pressure difference between the inner and outer pipes, this leakage risk can be significantly reduced, ensuring the safe and stable operation of the pipeline system.

[0043] Corresponding to the above embodiment, the present invention further provides an electronic device.

[0044] like Figure 4 The figure shows a schematic diagram of the structure of an electronic device in the present invention, where the electronic device 200 includes: a processor 201 and a memory 203. The processor 201 and the memory 203 are connected, such as through a bus 202. Optionally, the electronic device 200 may further include a transceiver 204. It should be noted that in actual applications, the transceiver 204 is not limited to one, and the structure of the electronic device 200 does not constitute a limitation on the embodiments of the present invention.

[0045] The processor 201 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of the present invention. The processor 201 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0046] The bus 202 may include a path to transmit information between the above components. The bus 202 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus 202 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0047] The memory 203 is used to store a computer program corresponding to the pressure calibration method of the above embodiment of the present invention, and the computer program is controlled and executed by the processor 201. The processor 201 is used to execute the computer program stored in the memory 203 to implement the contents shown in the above method embodiment.

[0048] The electronic device 200 includes, but is not limited to, mobile terminals such as laptop computers, PADs (tablet computers), and fixed terminals such as desktop computers. Figure 4 The electronic device 200 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0049] The electronic device 200 of the embodiment of the present invention determines the standard value of the pressure calibration of the pressure gauge 18 to be inspected, which not only effectively improves the accuracy of the pressure gauge calibration, but also optimizes the reliability and stability of the calibration device. At the same time, the pressure attenuation compensation module 3 effectively reduces the pressure fluctuation in the pipeline 2, further improving the accuracy of the calibration.

[0050] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or otherwise processing in a suitable manner if necessary, and then stored in a computer memory.

[0051] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A pressure calibration device for instrument equipment, comprising a liquid storage tank (1) and a pipeline (2), characterized in that: The output end of the liquid storage tank (1) is connected to a high-pressure pump (11), a pressure regulating valve (12), a pressure sensor 1 (13) and a three-way valve (15) in sequence through the pipeline (2); the two outlet ends of the three-way valve (15) are respectively connected to a standard pressure gauge (16) and a pressure sensor 2 (17) as well as a pressure gauge to be tested (18) and a pressure sensor 3 (19) through two pipelines (2); the two pipelines (2) are finally connected to the input end of the liquid storage tank (1); A pressure decay compensation module (3) is provided at both outlet ends of the three-way valve (15), and the pressure decay compensation module (3) is used to reduce pressure fluctuations in the pipeline (2); The pipeline (2) is a double-layer pipeline, comprising an outer pipe (21) and an inner pipe (22); The pressure decay compensation module (3) comprises a pressure monitor 1, a pressure monitor 2, a variable frequency electric piston pump and an adjustment mechanism, wherein the pressure monitor 1 and the pressure monitor 2 are respectively arranged inside the inner tube (22) and in the cavity space between the outer tube (21) and the inner tube (22); the variable frequency electric piston pump connects the outlet end of the three-way valve (15) with the output end of the liquid storage tank (1) through the pipeline (2); the connection between the outer tube (21) and the inner tube (22) and the outer wall of the outer tube (21) are both provided with the adjustment mechanism; the pressure monitor 1 is electrically connected to the variable frequency electric piston pump, and the pressure monitor 2 is electrically connected to the adjustment mechanism.

2. A pressure calibration device for instrument equipment according to claim 1, characterized in that: An overpressure protection valve (14) is provided between the pipeline (2) and the pressure sensor 1 (13) and the three-way valve (15).

3. A pressure calibration device for instrument equipment according to claim 1, characterized in that: A support member (23) is connected between the outer tube (21) and the inner tube (22) at intervals, and a cavity space between the outer tube (21) and the inner tube (22) is filled with a polymer composite material.

4. A pressure calibration device for instrument equipment according to claim 1, characterized in that: The regulating mechanism comprises a piston or a diaphragm.

5. A pressure calibration method for instrument equipment, characterized in that: The pressure calibration device according to any one of claims 1 to 4, wherein the pressure calibration method comprises the following steps: First, the high-pressure pump (11) draws out the pressure medium in the liquid storage tank (1), and the pressure medium passes through the pipeline (2), the pressure regulating valve (12), the pressure sensor 1 (13), and the overpressure protection valve (14) in sequence, and enters the three-way valve (15). The pressure regulating valve (12) is adjusted according to the real-time data of the pressure sensor 1 (13) to achieve accurate control of the output pressure. Then, the outlet end of the three-way valve (15) connected to the pressure gauge (18) to be tested is closed, and the outlet end of the three-way valve (15) connected to the standard pressure gauge (16) is opened, and the pressure medium passes through the pipeline (2) and the standard pressure gauge (16) and the second pressure sensor (17) in sequence into the liquid storage tank (1). Combining the real-time data of the second pressure sensor (17) and the reading of the standard pressure gauge (16), the computer program reads the reading of the standard pressure gauge (16) as the standard value; Then, the outlet end of the three-way valve (15) connected to the pressure gauge to be tested (18) is opened, and the outlet end of the three-way valve (15) connected to the standard pressure gauge (16) is closed, and the pressure medium passes through the pressure gauge to be tested (18) and the pressure sensor three (19) in sequence through the pipeline (2) and enters the liquid storage tank (1). Combining the real-time data of the pressure sensor three (19) and the reading of the pressure gauge to be tested (18), the computer program reads the reading of the pressure gauge to be tested (18) and compares it with the above standard value to calculate the error; During the above-mentioned calibration process, the pressure monitor 1 and the pressure monitor 2 in the pressure decay compensation module (3) continuously monitor the pressure inside the inner tube (22) and the cavity space between the outer tube (21) and the inner tube (22). When the pressure fluctuation is greater than a preset range, the pressure monitor 1 sends a signal to the variable frequency electric piston pump, and the variable frequency electric piston pump controls the liquid storage tank (1) to transport the pressure transmission medium to the inner tube (22) according to the required pressure to achieve the specified pressure. According to the signal from the pressure monitor 2, the regulating mechanism adjusts the pressure in the cavity space between the outer tube (21) and the inner tube (22) to balance the pressure difference between the outer tube (21) and the inner tube (22).

6. An electronic device, characterized in that: The device comprises a memory, a processor and a computer program stored in the memory, wherein when the computer program is executed by the processor, the pressure calibration method as claimed in claim 5 is implemented.

Images