High pressure control system and pressure verification device

Abstract

The utility model discloses a high-pressure pressure control system which comprises a pressure supply module, a pressure control pipeline and a first electromagnetic valve, and the pressure supply module is connected with the pressure control pipeline and used for supplying high-pressure fluid to the pressure control pipeline so as to increase the pressure value of the pressure control pipeline; the first electromagnetic valve is installed between the pressure supply module and the pressure control pipeline and used for controlling the pressure supply module to be opened or closed to supply high-pressure fluid to the pressure control pipeline. When the pressure of the pressure control pipeline is increased, the first electromagnetic valve controls the pressure supply module to be turned on or turned off to supply high-pressure fluid to the pressure control pipeline according to a first high-frequency switch working mode, and the first high-frequency switch working mode is at least related to the pressure value provided by the pressure supply module. The utility model also discloses a pressure verification device. According to the utility model, the high-pressure gas source / liquid source can be controlled to stably increase or decrease the pressure of the pressure control pipeline, and a reliable and stable pressure verification environment is provided for verification and verification of the pressure gauge.

Description

Technical Field

[0001] The utility model relates to the technical field of gas pressure control, in particular to a high-pressure pressure control system and a pressure calibration device. Background Art

[0002] At present, in some chemical, mechanical and pressure calibration fields, a certain pressure environment needs to be provided. In order to realize the automatic control of pressure, the pressure output pipeline is usually opened and closed by controlling the solenoid valve, thereby realizing the pressure regulation and control of the pressure environment.

[0003] Especially in the field of pressure verification and calibration, in order to provide a stable standard pressure, a solenoid valve is needed to adjust the standard pressure, so that the standard pressure can be used to verify and calibrate the pressure gauge to be tested. The traditional standard pressure adjustment method is to open the air inlet / liquid inlet solenoid valve first, and allow the gas / liquid from the gas source / liquid source to enter the standard pressure pipeline until the pressure value of the standard pressure pipeline reaches the standard pressure, then close the air inlet / liquid inlet solenoid valve; if the pressure value of the standard pressure pipeline is higher than the standard pressure, the exhaust / liquid discharge solenoid valve can be opened until the pressure value of the standard pressure pipeline reaches the standard pressure.

[0004] However, it is difficult to achieve precise control of the standard pressure with the traditional standard pressure regulation method, especially for high pressure control. If the air inlet / liquid inlet solenoid valve is closed when the standard pressure is reached, the high-pressure gas or liquid will flow into the standard pressure pipeline with more gas / liquid during the response closing time period, making it difficult to achieve precise pressure control. At the same time, in the process of opening the air inlet / liquid inlet solenoid valve to allow the gas / liquid from the gas source / liquid source to enter the standard pressure pipeline, the high-speed flow of gas / liquid will cause serious disturbances to the pressure value of the standard pressure pipeline, causing it to fluctuate, making it difficult to achieve stable pressure control. Utility Model Content

[0005] The purpose of the utility model is to provide a high-pressure pressure control system to solve the problem that the existing pressure regulation method cannot accurately control the standard pressure, and at the same time provide a pressure calibration device to provide a reliable and stable pressure calibration environment for the calibration and verification of the pressure gauge.

[0006] In order to solve the above problems, the utility model adopts the following technical solutions:

[0007] A high-pressure pressure control system includes a pressure supply module, a pressure control pipeline and a first solenoid valve.

[0008] The pressure supply module is connected to the pressure control pipeline and is used to supply high-pressure fluid to the pressure control pipeline to increase the pressure value of the pressure control pipeline;

[0009] The first solenoid valve is installed between the pressure supply module and the pressure control pipeline to control opening or closing of the pressure supply module to supply high-pressure fluid to the pressure control pipeline;

[0010] When the pressure control pipeline is boosted, the first solenoid valve is controlled to open or interrupt the pressure supply module to supply high-pressure fluid to the pressure control pipeline according to the first high-frequency switch working mode, and the first high-frequency switch working mode is at least related to the pressure value provided by the pressure supply module.

[0011] Preferably, the first high-frequency switching operating mode is that the first solenoid valve operates at a fixed switching frequency f1, and the value range of the fixed switching frequency f1 is: P1 (MPa) ≤ f1 (HZ) ≤ 2P1 (MPa); wherein P1 is the pressure value provided by the pressure supply module, in MPa.

[0012] Preferably, the first high-frequency switching operating mode is that the first solenoid valve operates according to the dynamic switching frequency f2, and the value range of the dynamic switching frequency f2 is: (P1-P2)(MPa)≤f2(HZ)≤2(P1-P2)(MPa); wherein P1 is the pressure value provided by the pressure supply module, in MPa, and P2 is the real-time pressure value of the pressure control pipeline, in MPa.

[0013] Preferably, it further comprises a circuit board and a first relay, the circuit board is electrically connected to the first relay, and the first relay is electrically connected to the first solenoid valve.

[0014] Preferably, it also includes a second solenoid valve, which is installed at an end of the pressure control pipeline away from the pressure supply module. When the pressure of the pressure control pipeline is reduced, the second solenoid valve controls the pressure control pipeline to open or interrupt the discharge of high-pressure fluid to the outside according to a second high-frequency switching working mode.

[0015] Preferably, the second high-frequency switch working mode is that the second solenoid valve works at a fixed switching frequency f3, and the fixed switching frequency f3 has a value range of: P3 (MPa) ≤ f3 (HZ) ≤ 2P3 (MPa), wherein P3 is the maximum pressure value required for the pressure control pipeline, in MPa;

[0016] Or, the second high-frequency switching working mode is that the second solenoid valve operates according to the dynamic switching frequency f4, and the value range of the dynamic switching frequency f4 is: (P2-P0) (MPa)≤f4(HZ)≤2(P2-P0) (MPa), where P2 is the real-time pressure value of the pressure control pipeline, in MPa, and P0 is the atmospheric pressure, in MPa.

[0017] Preferably, it further comprises a second relay electrically connected to the circuit board, and the second relay is electrically connected to the second solenoid valve.

[0018] Preferably, it also includes a pressure standard module, which is arranged on the pressure control pipeline and is used to sense the real-time pressure value in the pressure control pipeline, and based on the difference between the real-time pressure value and the target pressure value, to feedback the first solenoid valve to enter the first high-frequency switch working mode and increase the pressure of the pressure control pipeline, or to feedback the second solenoid valve to enter the second high-frequency switch working mode and reduce the pressure of the pressure control pipeline.

[0019] Preferably, the pressure supply module includes a pressure pump and a high-pressure gas tank, the pressure pump is used to build pressure for the high-pressure gas tank, the high-pressure gas tank is used to provide a stable pressure source for the pressure control pipeline, and a pressure sensor is provided in the high-pressure gas tank. The pressure value in the high-pressure gas tank is sensed by the pressure sensor. When the pressure value is lower than a preset pressure, the feedback pressure pump starts to build pressure, and when the pressure value is slightly higher than the preset pressure, the feedback pressure pump stops building pressure.

[0020] The present application also discloses a pressure calibration device, including a connector and the high-pressure pressure control system as described above, wherein the connector is connected to a pressure control pipeline of the high-pressure pressure control system and is used to install and connect a pressure gauge to be tested.

[0021] By adopting the above technical solution, the utility model has the following advantages:

[0022] The utility model controls the high-pressure gas source / liquid source to stably increase the pressure of the pressure control pipeline by controlling the first solenoid valve to work in the high-frequency switching mode, so that the air intake / liquid intake process will not cause a large disturbance to the pressure control pipeline. At the same time, the air intake / liquid is evenly distributed in the pressure control pipeline within one solenoid valve switching cycle to achieve a stable pressure increase; by controlling the second solenoid valve to work in the high-frequency switching mode, stable pressure control can be achieved.

[0023] Furthermore, the present application achieves a stable pressure control effect for different pressures by adjusting the switching frequency of the solenoid valve according to different pressures, thereby providing a reliable and stable pressure calibration environment for the calibration and verification of the pressure gauge. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a connection diagram of the utility model.

[0025] Figure numerals: 1. pressure pump, 2. high-pressure gas tank, 3. sensor, 4. pressure control pipeline, 5. first solenoid valve, 6. second solenoid valve, 7. pressure standard module, 8. first relay, 9. second relay, 10. circuit board, 11. connector, 12. pressure gauge to be tested, 13. standard pressure gauge. DETAILED DESCRIPTION

[0026] In order to make the technical purpose, technical scheme and beneficial effects of the utility model clearer, the following Figure 1The technical solution of the utility model is further illustrated with specific embodiments.

[0027] Example 1

[0028] A high-pressure pressure control system includes a pressure supply module, a pressure control pipeline 4 and a first solenoid valve 5.

[0029] The pressure supply module is connected to the pressure control pipeline 4 and is used to supply high-pressure fluid to the pressure control pipeline 4 to increase the pressure value of the pressure control pipeline 4;

[0030] The first solenoid valve 5 is installed between the pressure supply module and the pressure control pipeline 4 to control opening or closing of the pressure supply module to supply high-pressure fluid to the pressure control pipeline 4;

[0031] Among them, when the pressure control pipeline 4 is boosted, the first solenoid valve 5 is controlled to open or interrupt the pressure supply module to supply high-pressure fluid to the pressure control pipeline 4 according to the first high-frequency switch working mode, and the first high-frequency switch working mode is at least related to the pressure value provided by the pressure supply module.

[0032] This application controls the solenoid valve to work in a high-frequency switching mode to control the high-pressure gas source / liquid source to stably increase the pressure of the pressure control pipeline 4. The principle is as follows:

[0033] Under high pressure, the amount of air / liquid per unit time is large. If the switching frequency of the solenoid valve is low, the amount of air / liquid per switching cycle is large. Although rapid pressure increase can be achieved, smooth pressure increase cannot be achieved, which is not conducive to verification. In the high-frequency switching mode, the solenoid valve switches quickly, and only a small amount of air / liquid is introduced in each switching cycle. On the one hand, a small amount of air / liquid will not cause a large disturbance to the pressure of the pressure control pipeline. On the other hand, a small amount of air / liquid can be averaged to every place in the pressure control pipeline 4 within one solenoid valve switching cycle to achieve smooth pressure increase.

[0034] Example 2

[0035] On the basis of Example 1, the first high-frequency switch working mode is that the first solenoid valve 5 works at a fixed switching frequency f1, and the fixed switching frequency f1 has a value range of: P1 (MPa) ≤ f1 (HZ) ≤ 2P1 (MPa); wherein P1 is the pressure value provided by the pressure supply module, in MPa. It is understood that if the unit of the pressure value is not MPa, such as psi or bar, it needs to be converted into MPa.

[0036] It can be understood that the pressure supply module usually needs to provide a pressure greater than the pressure required by the pressure control pipeline 4, and the pressure provided by the pressure supply module often depends on the range of the pressure gauge calibration, that is, the maximum pressure required by the pressure control pipeline 4. For example, when the pressure gauge with a calibration range of 70MPa is used, the pressure value provided by the pressure supply module needs to be slightly greater than 70MPa, such as 75MPa, that is, P1=75MPa. For such a high pressure, the fixed switching frequency f1 of the first solenoid valve 5 can be relatively high (because the air intake per unit time is large under high pressure, if the switching frequency of the first solenoid valve 5 is low, there will be a large amount of air intake / liquid intake in each switching cycle, although rapid pressure increase can be achieved, but stable pressure increase cannot be achieved, and the high-speed flow of gas / liquid will cause serious disturbances to the pressure value of the pressure control pipeline 4, which is not conducive to the calibration and verification of the pressure gauge; on the contrary, if the switching frequency of the first solenoid valve 5 is too high, the air intake / liquid intake in each switching cycle is too small, although better stable pressure increase can be achieved, the speed of pressure increase will be reduced, which is not conducive to verification). Therefore, at this time, the value range of the fixed switching frequency f1 can be set to [P1, 2P1], that is, [75, 150].

[0037] Preferably, the fixed switching frequency f1 may be 100 Hz.

[0038] Example 3

[0039] Based on Example 1, the first high-frequency switching working mode is that the first solenoid valve 5 operates according to the dynamic switching frequency f2, and the value range of the dynamic switching frequency f2 is: (P1-P2)(MPa)≤f2(HZ)≤2(P1-P2)(MPa); wherein P1 is the pressure value provided by the pressure supply module, in MPa, and P2 is the real-time pressure value of the pressure control pipeline 4, in MPa.

[0040] It can be understood that the pressure P1 provided by the pressure supply module is generally relatively fixed (the pressure provided by the pressure supply module often depends on the range of the pressure gauge calibration, that is, the maximum pressure required by the pressure control pipeline 4), for example, 75MPa, but the pressure P2 of the pressure control pipeline 4 will change with different calibration stages. For example, during the boost calibration process, the previous calibration point is 10MPa, and the current calibration point is 15MPa. The pressure difference at the previous calibration point is (P1-P2) = 65MPa, so the dynamic switching frequency f2 at the previous calibration point has a value range of greater than or equal to 65HZ and less than or equal to 130HZ; the pressure difference at the current calibration point is (P1-P2) = 60MPa, so the current dynamic switching frequency f2 has a value range of greater than or equal to 60HZ and less than or equal to 120HZ.

[0041] If the real-time pressure value P2 of the pressure control pipeline 4 differs greatly from the pressure value P1 provided by the pressure supply module, in order to achieve the pressure increase of the pressure control pipeline 4, the air intake / liquid intake per unit time will be large. If the switching frequency of the first solenoid valve 5 is low, a large amount of air intake / liquid intake will occur in each switching cycle. Although rapid pressure increase can be achieved, smooth pressure increase cannot be achieved, which is not conducive to the calibration and verification of the pressure gauge. Therefore, the minimum value allowed by the dynamic switching frequency f2 is relatively high at this time.

[0042] The present application achieves a stable pressure control effect for different pressures by adjusting the switching frequency of the solenoid valve according to different pressures, thereby providing a reliable and stable pressure calibration environment for the calibration and verification of the pressure gauge.

[0043] Example 4

[0044] Based on Example 1, the present application also includes a circuit board 10 and a first relay 8. The circuit board 10 is electrically connected to the first relay 8, and the first relay 8 is electrically connected to the first solenoid valve 5. The circuit board 10 realizes electrical control of the first solenoid valve 5 through the first relay 8.

[0045] It can be understood that the working voltage of the first solenoid valve 5 may be relatively high, such as 48V, while the working voltage of the circuit board 10 is usually relatively low, such as 24V, so it is impossible to directly power and control the first solenoid valve 5 through the circuit board 10, and the high voltage of the first solenoid valve 5 will also interfere with the circuit board 10, causing damage to electronic components. Therefore, the first relay 8 can be used as a relay isolation module, one end of the relay is connected to the circuit board 10, and the other end is connected to the first solenoid valve 5. The circuit board 10 controls the first solenoid valve 5 through the first relay 8, and the working voltage of the circuit board 10 is 12V, and the working voltage of the first solenoid valve 5 is 48V (an additional power supply can be provided), and the two do not interfere with each other.

[0046] Example 5

[0047] Based on Example 1, the present application also includes a second solenoid valve 6, which is installed at an end of the pressure control pipeline 4 away from the pressure supply module. When the pressure of the pressure control pipeline 4 is reduced, the second solenoid valve 6 controls the pressure control pipeline 4 to open or interrupt the discharge of high-pressure fluid to the outside according to the second high-frequency switching working mode.

[0048] It can be understood that when the pressure in the pressure control pipeline 4 is higher than the preset standard pressure, the pressure can be reduced by the second solenoid valve 6. In addition, according to the verification and calibration regulations, a calibration process includes both a pressure increase calibration process and a pressure reduction return calibration. During the return calibration, the pressure of the pressure control pipeline 4 also needs to be gradually reduced. The present application uses the second solenoid valve 6 and controls the pressure control pipeline 4 to open or interrupt the discharge of high-pressure fluid to the outside according to the second high-frequency switch working mode, thereby ensuring a smooth pressure reduction.

[0049] Example 6

[0050] On the basis of Example 5, the second high-frequency switch working mode is that the second solenoid valve 6 works at a fixed switching frequency f3, and the value range of the fixed switching frequency f3 is: P3 (MPa) ≤ f3 (HZ) ≤ 2P3 (MPa), where P3 is the maximum pressure value required for the pressure control pipeline 4, in MPa;

[0051] Or, the second high-frequency switching working mode is that the second solenoid valve 6 works according to the dynamic switching frequency f4, and the value range of the dynamic switching frequency f4 is: (P2-P0) (MPa) ≤ f4 (HZ) ≤ 2 (P2-P0) (MPa), where P2 is the real-time pressure value of the pressure control pipeline 4, in MPa, and P0 is the atmospheric pressure, in MPa.

[0052] In one of the embodiments, the second solenoid valve 6 operates at a fixed switching frequency f3, that is, the value of f3 is determined according to the maximum pressure value P3 required for the pressure control of the pressure control pipeline 4. Assuming that P3 is 70MPa, the value range of the fixed switching frequency f3 is [70,140]. Preferably, the fixed switching frequency f3 can be 100HZ.

[0053] In another embodiment, the second solenoid valve 6 operates at a dynamic switching frequency f4. In different verification stages, the pressure P2 of the pressure control pipeline 4 will change with the change of the verification stage, and the switching frequency of the second solenoid valve 6 will also change dynamically. If the pressure P2 of the pressure control pipeline 4 is significantly different from the atmospheric pressure (that is, the value of P2-P0 is larger), the minimum allowable value of the dynamic switching frequency f4 is also relatively high, which can achieve a smooth pressure reduction and is conducive to the continuous verification and verification work. When the pressure P2 of the pressure control pipeline 4 changes from large to small (for example, during the return verification, the verification point changes from 15MPa to 10MPa), the value of P2-P0 decreases accordingly, and the minimum allowable value of the dynamic switching frequency f4 becomes smaller. The increase in the air / liquid volume in each switching cycle will not cause a large disturbance. Stable pressure control can be achieved under different pressure environments, and the pressure control speed can be taken into account at the same time.

[0054] It can be understood that for low pressure, the switching frequency of the solenoid valve can be relatively low. Since the air / liquid volume per unit time is small under low pressure, if the switching frequency of the solenoid valve is high, although a smooth pressure increase can be achieved, the speed of the pressure increase is not high, which is not conducive to calibration.

[0055] Example 7

[0056] Based on Example 5, the present application also includes a second relay 9 electrically connected to the circuit board 10 , the second relay 9 is electrically connected to the second solenoid valve 6 , and the circuit board 10 realizes electrical control of the second solenoid valve 6 through the second relay 9 .

[0057] Example 8

[0058] Based on Example 5, the present application also includes a pressure standard module 7, which is arranged on the pressure control pipeline 4, and is used to sense the real-time pressure value in the pressure control pipeline 4, and based on the difference between the real-time pressure value and the target pressure value, to feedback the first solenoid valve 5 to enter the first high-frequency switch working mode and increase the pressure of the pressure control pipeline 4, or to feedback the second solenoid valve 6 to enter the second high-frequency switch working mode and reduce the pressure of the pressure control pipeline 4.

[0059] The pressure standard module 7 can be any component available on the market that can achieve the above-mentioned purpose, such as the pressure sensor 3 .

[0060] Example 9

[0061] The pressure supply module includes a pressure pump 1 and a high-pressure gas tank 2. The pressure pump 1 is used to build pressure for the high-pressure gas tank 2. The high-pressure gas tank 2 is used to provide a stable pressure source for the pressure control pipeline 4. A pressure sensor 3 is provided in the high-pressure gas tank 2. The pressure value in the high-pressure gas tank 2 is sensed by the pressure sensor 3. When the pressure value is lower than the preset pressure, the feedback pressure pump 1 works to build pressure. When the pressure value is slightly higher than the preset pressure, the feedback pressure pump 1 stops building pressure.

[0062] Example 10

[0063] A pressure calibration device comprises a connector 11 and a high-pressure pressure control system as described in any one of Examples 1-9, wherein the connector 11 is connected to a pressure control pipeline 4 of the high-pressure pressure control system and is used for installing and connecting a pressure gauge 12 to be tested.

[0064] In a specific embodiment, one end of the connector 11 is connected to the pressure control pipeline 4 and is located between the first solenoid valve 5 and the second solenoid valve 6. The other end of the connector 11 is simultaneously connected to the pressure gauge 12 to be tested and the standard pressure gauge 13. The standard pressure gauge 13 is used to provide a comparison for the pressure gauge 12 to be tested.

[0065] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0066] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0067] The above embodiments do not impose any formal restrictions on the shape, material, structure, etc. of the utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model are within the protection scope of the technical solution of the utility model.

[0068] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A high pressure control system, characterized in that: It includes a pressure supply module, a pressure control pipeline and a first solenoid valve, The pressure supply module is connected to the pressure control pipeline and is used to supply high-pressure fluid to the pressure control pipeline to increase the pressure value of the pressure control pipeline; The first solenoid valve is installed between the pressure supply module and the pressure control pipeline to control opening or closing of the pressure supply module to supply high-pressure fluid to the pressure control pipeline; When the pressure control pipeline is boosted, the first solenoid valve is controlled to open or interrupt the pressure supply module to supply high-pressure fluid to the pressure control pipeline according to the first high-frequency switch working mode, and the first high-frequency switch working mode is at least related to the pressure value provided by the pressure supply module.

2. A high pressure control system according to claim 1, characterized in that: The first high-frequency switching working mode is that the first solenoid valve operates at a fixed switching frequency f1, and the value range of the fixed switching frequency f1 is: P1 (MPa) ≤ f1 (HZ) ≤ 2P1 (MPa); wherein P1 is the pressure value provided by the pressure supply module.

3. A high pressure control system according to claim 1, characterized in that: The first high-frequency switching working mode is that the first solenoid valve operates according to the dynamic switching frequency f2, and the value range of the dynamic switching frequency f2 is: (P1-P2)(MPa)≤f2(HZ)≤2(P1-P2)(MPa); wherein P1 is the pressure value provided by the pressure supply module, and P2 is the real-time pressure value of the pressure control pipeline.

4. A high pressure control system according to claim 1, characterized in that: It also includes a circuit board and a first relay, the circuit board is electrically connected to the first relay, and the first relay is electrically connected to the first solenoid valve.

5. A high pressure control system according to claim 1, characterized in that: It also includes a second solenoid valve, which is installed at an end of the pressure control pipeline away from the pressure supply module. When the pressure of the pressure control pipeline is reduced, the second solenoid valve controls the pressure control pipeline to open or interrupt the discharge of high-pressure fluid to the outside according to a second high-frequency switching working mode.

6. A high pressure control system according to claim 5, characterized in that: The second high-frequency switch working mode is that the second solenoid valve works at a fixed switching frequency f3, and the value range of the fixed switching frequency f3 is: P3 (MPa) ≤ f3 (HZ) ≤ 2P3 (MPa), where P3 is the maximum pressure value required for the pressure control pipeline; Or, the second high-frequency switching working mode is that the second solenoid valve operates according to the dynamic switching frequency f4, and the value range of the dynamic switching frequency f4 is: (P2-P0) (MPa)≤f4(HZ)≤2(P2-P0) (MPa), where P2 is the real-time pressure value of the pressure control pipeline, and P0 is the atmospheric pressure.

7. A high pressure control system according to claim 5, characterized in that: It also includes a second relay electrically connected to the circuit board, and the second relay is electrically connected to the second solenoid valve.

8. A high pressure control system according to claim 5, characterized in that: It also includes a pressure standard module, which is arranged on the pressure control pipeline and is used to sense the real-time pressure value in the pressure control pipeline, and based on the difference between the real-time pressure value and the target pressure value, to feedback the first solenoid valve to enter the first high-frequency switch working mode and increase the pressure of the pressure control pipeline, or to feedback the second solenoid valve to enter the second high-frequency switch working mode and reduce the pressure of the pressure control pipeline.

9. A high pressure control system according to claim 1, characterized in that: The pressure supply module includes a pressure pump and a high-pressure gas tank. The pressure pump is used to build pressure for the high-pressure gas tank. The high-pressure gas tank is used to provide a stable pressure source for the pressure control pipeline. A pressure sensor is provided in the high-pressure gas tank. The pressure value in the high-pressure gas tank is sensed by the pressure sensor. When the pressure value is lower than the preset pressure, the feedback pressure pump starts to build pressure. When the pressure value is slightly higher than the preset pressure, the feedback pressure pump stops building pressure.

10. A pressure calibration device, characterized in that: It comprises a connecting piece and a high-pressure pressure control system as described in any one of claims 1 to 9, wherein the connecting piece is connected to a pressure control pipeline of the high-pressure pressure control system and is used for installing and connecting a pressure gauge to be tested.

Images