Pressure regulation method for a blowing test device of a series double pressure regulating valve

Abstract

The present invention discloses a pressure regulation method for a blowing test device of a series double pressure regulating valve, which relates to the field of blowing test devices. This method simplifies the multi-variable control method for pressure regulation of the series double pressure regulating valve. First, the secondary pressure regulating valve is fixed, and the pressure after the secondary pressure regulating valve is adjusted only by the change of the primary pressure regulating valve. When the opening of the primary pressure regulating valve runs to the maximum opening, the secondary pressure regulating valve starts to regulate the pressure. By this method, the multi-variable control problem of pressure regulation of the series double pressure regulating valve is simplified to a single-variable control problem of a single regulating valve for pressure regulation. Through this method, the debugging difficulty of pressure regulation of the blowing test device of the series double pressure regulating valve can be effectively reduced, and the debugging efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the field of blowing test devices, and in particular, to a pressure regulation method for a blowing test device with a series-connected dual pressure regulating valve. Background Art

[0002] For the pressure regulation of a series-connected dual pressure regulating valve, when the gas source pressure is the same, different opening degrees of the first-stage pressure regulating valve will cause changes in the pressure after the first-stage pressure regulating valve (before the second-stage pressure regulating valve). Moreover, different opening degrees of the second-stage pressure regulating valve also result in different air flow rates of the second-stage pressure regulating valve, which also affects the pressure after the first-stage pressure regulating valve. Therefore, the control of the two pressure regulating valves belongs to a multi-variable control problem.

[0003] In actual control, the control of the series-connected dual pressure regulating valve is decoupled, and the control method of the first-stage pressure regulating valve is simplified. Usually, the second-stage pressure regulating valve is used to complete the pressure closed-loop. The first-stage pressure regulating valve slowly adjusts the opening degree according to the gas source pressure, and matches the opening degree of the first-stage pressure regulating valve with the gas source pressure drop speed, so that the pressure after the first-stage pressure regulating valve is roughly stable. The second-stage pressure regulating valve can ensure that the pressure after the second-stage valve is basically stable under the condition of small-range adjustment of the opening degree. However, this pressure regulation method has high requirements for the accuracy of the adjustment relationship between the opening degree of the first-stage pressure regulating valve and the change of the gas source pressure, and the debugging difficulty is large. Summary of the Invention

[0004] The purpose of the present invention is to effectively reduce the debugging difficulty of the pressure regulation of the blowing test device with a series-connected dual pressure regulating valve through this method and improve the debugging efficiency.

[0005] To achieve the above invention purpose, the present invention provides a pressure regulation method for a blowing test device with a series-connected dual pressure regulating valve. The blowing test device includes: a high-pressure gas tank, a quick valve, a first-stage pressure regulating valve, a second-stage pressure regulating valve, a pressure sensor, a test section, and several connecting pipes; there are connecting pipes connecting between the outlet of the high-pressure gas tank and one end of the quick valve, between the other end of the quick valve and one end of the first-stage pressure regulating valve, between the other end of the first-stage pressure regulating valve and one end of the second-stage pressure regulating valve, and between the other end of the second-stage pressure regulating valve and the test section. The pressure sensor is installed on the connecting pipe between the second-stage pressure regulating valve and the test section;

[0006] The method includes:

[0007] Step 1: Check the actual pressure of the high-pressure gas tank, adjust the gas pressure in the high-pressure gas tank to half of the designed maximum gas source pressure of the blowing test device, and enter Step 2;

[0008] Step 2: Adjust the first-stage pressure regulating valve to the fully open position, and enter Step 3;

[0009] Step 3: Adjust the second-stage pressure regulating valve to the fully closed position, and enter Step 4;

[0010] Step 4: Open the quick valve, keep the position of the first-stage pressure regulating valve fully open, adjust the control parameters of the second-stage pressure regulating valve to make the pressure after the second-stage pressure regulating valve stable at the target working pressure, and then close the quick valve to enter Step 5;

[0011] Step 5: Determine whether the control parameters of the second-stage pressure regulating valve meet the requirements for the regulating accuracy of the pressure after the valve. If so, enter Step 6; if not, return to Step 4 and update the control parameters of the second-stage pressure regulating valve;

[0012] Step 6: Debug the second-stage pressure regulating valve according to the control parameters of the second-stage pressure regulating valve that meet the requirements to obtain the pressure ratio of the front and rear of the valve at different opening degrees of the second-stage pressure regulating valve. Based on the pressure ratio of the front and rear of the valve at different opening degrees of the second-stage pressure regulating valve, obtain the first correspondence relationship between the pressure ratio and the opening degree of the second-stage pressure regulating valve, and enter Step 7;

[0013] Step 7: Set the pressure in front of the second-stage pressure regulating valve to half of the designed maximum gas source pressure of the blowing test device, set the pressure behind the second-stage valve to the target working pressure, calculate and obtain the first opening degree of the second-stage pressure regulating valve according to the first correspondence relationship, and enter Step 8;

[0014] Step 8: Adjust the gas pressure in the high-pressure gas tank to the maximum gas source pressure of the blowing test device and enter Step 9;

[0015] Step 9: Position the second-stage pressure regulating valve to the first opening degree and enter Step 10;

[0016] Step 10: Operate the first-stage pressure regulating valve to the fully closed position and enter Step 11;

[0017] Step 11: After the gas pressure in the high-pressure gas tank reaches the maximum gas source pressure of the blowing test device, the second-stage pressure regulating valve is positioned to the first opening degree, and the first-stage pressure regulating valve is operated to the fully closed position, enter Step 12;

[0018] Step 12: Open the quick valve, keep the position of the second-stage pressure regulating valve fixed, adjust the control parameters of the first-stage pressure regulating valve to make the pressure after the second-stage pressure regulating valve stable at the target working pressure, and then close the quick valve to enter Step 13;

[0019] Step 13: Determine whether the control parameters of the first-stage pressure regulating valve meet the requirements for the regulating accuracy of the pressure after the second-stage pressure regulating valve. If so, enter Step 14; if not, return to Step 12 and update the control parameters of the first-stage pressure regulating valve;

[0020] Step 14: Debug the first-stage pressure regulating valve according to the control parameters of the first-stage pressure regulating valve that meet the requirements to obtain the pressure ratio of the front of the first-stage pressure regulating valve and the rear of the second-stage pressure regulating valve at different opening degrees of the first-stage pressure regulating valve. Based on the pressure ratio of the front of the first-stage pressure regulating valve and the rear of the second-stage pressure regulating valve at different opening degrees of the first-stage pressure regulating valve, obtain the second correspondence relationship between the pressure ratio and the opening degree of the first-stage pressure regulating valve, and enter Step 15;

[0021] Step 15: Adjust the air source pressure of the air blowing test device to the working range, calculate the second opening degree of the first-stage pressure regulating valve according to the second corresponding relationship and the actual gas pressure in the high-pressure gas tank, keep the second-stage pressure regulating valve at the first opening degree, and enter Step 16;

[0022] Step 16: Adjust the first-stage pressure regulating valve to the second opening degree, adjust the second-stage pressure regulating valve to the first opening degree, and enter Step 17;

[0023] Step 17: Open the quick valve and enter Step 18;

[0024] Step 18: Keep the position of the second-stage pressure regulating valve fixed, and use the qualified control parameters of the first-stage pressure regulating valve obtained in Step 14 to adjust the first-stage pressure regulating valve to achieve automatic pressure regulation of the pressure after the second-stage pressure regulating valve, and enter Step 19;

[0025] Step 19: Detect whether the position of the first-stage pressure regulating valve runs to the fully open position. If so, enter Step 20. If not, return to Step 18 and update the control parameters of the first-stage pressure regulating valve;

[0026] Step 20: Keep the position of the first-stage pressure regulating valve fixed at the fully open position, and use the second-stage pressure regulating valve to achieve automatic pressure regulation of the pressure after the second-stage pressure regulating valve, and enter Step 21;

[0027] Step 21: Judge whether the test is over or whether the gas pressure in the high-pressure gas tank is lower than the working pressure. If so, enter Step 22. If not, enter Step 21;

[0028] Step 22: End the test.

[0029] One or more technical solutions provided by the present invention have at least the following technical effects or advantages:

[0030] This method can effectively reduce the debugging difficulty of pressure regulation of the air blowing test device with a series-connected double pressure regulating valve and improve the debugging efficiency. Description of the Drawings

[0031] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of the present invention, and do not constitute a limitation to the embodiments of the present invention;

[0032] Figure 1 It is a schematic diagram of the composition of the air blowing test device with a series-connected double pressure regulating valve in the present invention;

[0033] Among them, 1 - high-pressure gas tank, 2 - connecting pipeline, 3 - quick valve, 4 - first-stage pressure regulating valve, 5 - second-stage pressure regulating valve, 6 - pressure sensor, 7 - test section. Detailed Embodiment

[0034] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0035] In the following description, many specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention may be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0036] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention 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. Therefore, the above terms should not be construed as limiting the present invention.

[0037] It can be understood that the term "one" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "one" should not be construed as a limitation on the quantity.

[0038] Embodiment 1;

[0039] The series double pressure regulating valve blowing test device in the embodiment of the present invention is as Figure 1 shown, and includes a high-pressure gas tank 1, a quick valve 3, a first-stage pressure regulating valve 4, a second-stage pressure regulating valve 5, a pressure sensor 6, a test section 7 and a connecting pipe 2. The function of the high-pressure gas tank 1 is to provide a gas source for the blowing test device, so that a flow field with required speed and uniformity is generated in the test section during the working process of the blowing test device. The function of the quick valve 3 is to quickly open and close the high-pressure gas in the high-pressure gas tank. The first-stage pressure regulating valve 4 and the second-stage pressure regulating valve 5 work together, adopting two-stage pressure regulation to regulate the high-pressure gas source to a specified pressure. The pressure sensor 6 is used to feedback the pressure after the second-stage pressure regulating valve 5 to realize closed-loop control of the pressure after the valve. The connecting pipe 2 is used to connect each device of the blowing test device, so that the air flow flows through the first-stage pressure regulating valve, the second-stage pressure regulating valve and the test section in sequence. The test section 7 is mainly used to provide a uniform air flow with a set speed for the test target during the working process.

[0040] Traditional air-blowing test devices usually adopt a single-stage pressure regulating valve to adjust the air source pressure from high pressure to the specified pressure after the pressure regulating valve. During the operation of the air-blowing test device, the air source pressure will continuously decrease over time. If the pressure after the position pressure regulating valve is to be stable, the opening of the pressure regulating valve needs to be continuously adjusted. For air-blowing test devices with a large flow rate, to ensure long-term stable operation of the air-blowing device under the condition of limited air source volume, it is necessary to increase the air source pressure. At this time, a single-stage pressure regulating valve cannot adjust the high air source pressure to the target pressure, and a double pressure regulating valve needs to be adopted. In a series form, the pressure after the pressure regulating valve is adjusted to the target pressure through two-stage pressure regulation, so as to achieve long-term stable operation of the flow field in the test section.

[0041] For the series pressure regulation of a double pressure regulating valve, at the same air source pressure, the opening of the first-stage pressure regulating valve will affect the pressure after the first-stage pressure regulating valve, that is, the pressure before the second-stage pressure regulating valve. Therefore, for the pressure regulation of a series double pressure regulating valve, the control parameters of the two pressure regulating valves are a multi-variable control problem, and usually a complex multi-variable control method is adopted to achieve it.

[0042] For the pressure regulation of a series double pressure regulating valve, when the air source pressure is the same, different openings of the first-stage pressure regulating valve will cause changes in the pressure after the first-stage pressure regulating valve (before the second-stage pressure regulating valve). Moreover, different openings of the second-stage pressure regulating valve will also result in different air flow rates of the second-stage pressure regulating valve, which also affects the pressure after the first-stage pressure regulating valve. Therefore, the control of the two pressure regulating valves belongs to a multi-variable control problem.

[0043] In the actual control of the prior art, the series double pressure regulating valve control is decoupled, and the control method of the first-stage pressure regulating valve is simplified. Usually, the second-stage pressure regulating valve is used to complete the pressure closed-loop. The first-stage pressure regulating valve slowly adjusts the opening according to the air source pressure, matches the opening of the first-stage pressure regulating valve with the decreasing speed of the air source pressure, and the pressure after the first-stage pressure regulating valve is roughly stable. The second-stage pressure regulating valve can ensure that the pressure after the second-stage valve is basically stable under the condition of small-range adjustment of the opening. However, this pressure regulation method has high requirements for the accuracy of the adjustment relationship between the opening of the first-stage pressure regulating valve and the change of the air source pressure, and the debugging difficulty is large.

[0044] The embodiment of the present invention provides a pressure regulation method for a series double pressure regulating valve air-blowing test device. By simplifying the multi-variable control method of the pressure regulation of the series double pressure regulating valve, first fix the second-stage pressure regulating valve, and only adjust the pressure after the second-stage pressure regulating valve through the change of the first-stage pressure regulating valve. When the opening of the first-stage pressure regulating valve runs to the maximum opening, start the pressure regulation of the second-stage pressure regulating valve. Through this method, the multi-variable control problem of the pressure regulation of the series double pressure regulating valve is simplified to a single-variable control problem of a single regulating valve for pressure regulation.

[0045] An embodiment of the present invention provides a pressure adjustment method for a blowing test device with a series-connected dual pressure regulating valve, which is applicable to a blowing test device that regulates the pipeline pressure after the valve using a series-connected dual pressure regulating valve in a high-pressure gas source environment, and this method can also be extended to a more complex pressure regulating device with a series connection of multiple pressure regulating valves.

[0046] This method includes the following steps:

[0047] Step 1: Check the actual pressure of the high-pressure gas tank, and adjust the gas pressure in the high-pressure gas tank to half of the designed maximum gas source pressure of the blowing test device according to the designed maximum gas source pressure of the blowing test device, and then enter Step 2;

[0048] Step 2: Adjust the first-stage pressure regulating valve to the fully open position, and then enter Step 3;

[0049] Step 3: Adjust the second-stage pressure regulating valve to the fully closed position, and then enter Step 4;

[0050] Step 4: Open the quick valve, keep the position of the first-stage pressure regulating valve in the fully open position, adjust the control parameters of the second-stage pressure regulating valve so that the pressure after the second-stage pressure regulating valve is stable at the target working pressure, and then close the quick valve, and enter Step 5;

[0051] Step 5: Judge whether the control parameters of the second-stage pressure regulating valve meet the requirements of the pressure regulation accuracy after the valve. If so, enter Step 6; if not, enter Step 4;

[0052] Step 6: According to the debugging data of the control parameters of the second-stage pressure regulating valve that meet the requirements, obtain the pressure ratio before and after the valve of the second-stage pressure regulating valve at different opening degrees, and obtain the corresponding relationship between the pressure ratio and the opening degree of the second-stage pressure regulating valve through polynomial fitting, and then enter Step 7;

[0053] Step 7: According to the pressure ratio relationship of the second-stage pressure regulating valve, set the pressure before the second-stage pressure regulating valve to half of the designed maximum gas source pressure of the blowing test device, set the pressure after the second-stage valve to the target working pressure, calculate the opening degree of the second-stage pressure regulating valve, and then enter Step 8;

[0054] The reason for using a dual-valve series connection to regulate the pipeline pressure is that for a test device using a high-pressure gas source, the pressure regulation ability of a single pressure regulating valve is not sufficient to meet the equipment test requirements. It is necessary to first reduce the gas source pressure once through the first-stage pressure regulating valve to reduce the pressure before the second-stage pressure regulating valve, and then use the second-stage pressure regulating valve to achieve the stable control function of the pressure after the second-stage pressure regulating valve. The purpose of Steps 2 - 7 is to adjust the pressure after the first-stage pressure regulating valve to half of the high-pressure gas source pressure after the first-stage decompression. Using this pressure and the target pressure after the second-stage pressure regulating valve, calculate the opening degree of the second-stage pressure regulating valve. When the gas source pressure is greater than half of the maximum gas source pressure, keep the opening degree of the second-stage pressure regulating valve unchanged, and only use the first-stage pressure regulating valve to achieve the stable regulation of the pressure after the second-stage pressure regulating valve;

[0055] Step 8: Adjust the gas pressure in the high-pressure gas tank to the maximum gas source pressure of the air blowing test device, and proceed to Step 9;

[0056] Step 9: Position the secondary pressure regulating valve to the opening position according to the opening of the secondary pressure regulating valve calculated in Step 7, and then proceed to Step 10;

[0057] Step 10: Run the primary pressure regulating valve to the fully closed position, and proceed to Step 11;

[0058] Step 11: Wait until the high-pressure gas source pressure reaches the maximum gas source pressure of the air blowing test device, and the primary pressure regulating valve and the secondary pressure regulating valve run to the positions in Step 9 and Step 10, then proceed to Step 12;

[0059] Step 12: Open the quick valve, keep the position of the secondary pressure regulating valve fixed, adjust the control parameters of the primary pressure regulating valve so that the pressure behind the secondary pressure regulating valve is stable at the target working pressure, and then close the quick valve, and proceed to Step 13;

[0060] Step 13: Determine whether the control parameters of the primary pressure regulating valve meet the requirements for the pressure regulation accuracy behind the secondary pressure regulating valve. If so, proceed to Step 14; if not, proceed to Step 12;

[0061] Step 14: According to the debugging data of the control parameters of the primary pressure regulating valve that meet the requirements, obtain the pressure ratio before and after the primary pressure regulating valve at different openings, and obtain the corresponding relationship between the pressure ratio of the primary pressure regulating valve and the opening through polynomial fitting, and then proceed to Step 15;

[0062] Among them, the purpose of Steps 8 - 14 is to, when the opening of the secondary pressure regulating valve calculated in Step 7 is fixed and the actual gas source pressure is greater than half of the maximum gas source pressure, only use the primary pressure regulating valve to achieve the regulation of the pressure in the pipeline behind the secondary valve of the test device, and reduce the difficulty of multivariable control in the state of simultaneous regulation of the series double pressure regulating valves;

[0063] Step 15: Adjust the gas source pressure of the air blowing test device to the working range. According to the pressure ratio relationship of the primary pressure regulating valve, calculate the opening of the primary pressure regulating valve according to the actual pressure of the high-pressure gas source, and keep the secondary pressure regulating valve at the position in Step 7, and then proceed to Step 16;

[0064] Step 16: Preset the pressure regulating valve according to the positions of the primary pressure regulating valve and the secondary pressure regulating valve calculated in Step 15, and then proceed to Step 17;

[0065] Step 17: Open the quick valve, and proceed to Step 18;

[0066] Step 18: Keep the position of the secondary pressure regulating valve fixed, and use the parameters of the primary pressure regulating valve determined in Step 14 to adjust the primary pressure regulating valve to achieve automatic pressure regulation of the pressure behind the secondary pressure regulating valve, and then proceed to Step 19;

[0067] Step 19: Detect whether the position of the first-stage pressure regulating valve has reached the fully open position. If so, proceed to Step 20; if not, proceed to Step 18;

[0068] Step 20: Keep the position of the first-stage pressure regulating valve fixed at the fully open position, and use the second-stage pressure regulating valve to achieve automatic pressure regulation of the pressure after the second-stage pressure regulating valve, then proceed to Step 21;

[0069] Step 21: Determine whether the test is over or whether the gas source pressure is lower than the working pressure. If so, proceed to Step 22; if not, proceed to Step 21;

[0070] Step 22: End the test.

[0071] Among them, the control parameters of both the first-stage and second-stage pressure regulating valves adopt classical PID control. The PID parameters are judged whether they meet the control accuracy requirements of the pressure after the second-stage pressure regulating valve according to whether the pressure is stable after the second-stage pressure regulation during the debugging process.

[0072] Among them, the embodiments of the present invention adopt the existing polynomial fitting method for corresponding fitting processing, and the embodiments of the present invention do not elaborate on the polynomial fitting.

[0073] The most core technology of the pressure regulation method of a series of double pressure regulating valve air blowing test device involved in the present invention is that during the pressure regulation process, a method of non-simultaneous operation of the first-stage pressure regulating valve and the second-stage pressure regulating valve is adopted. First, keep the position of the second-stage pressure regulating valve fixed. At this time, the pressure regulation problem of the series of double pressure regulating valves is transformed into a pressure regulation problem of a single-stage pressure regulating valve. When the first-stage pressure regulating valve runs to the maximum opening and is not enough to complete the pressure regulation function, keep the first-stage pressure regulating valve in the fully open state, and the second-stage pressure regulating valve completes the pressure regulation of the air blowing test device. This method perfectly avoids the multi-variable control problem when the series of double pressure regulating valves operate simultaneously, and can also quickly complete the control parameters of the series of double pressure regulating valves, improving the debugging efficiency.

[0074] In addition, another technical key point of this method is the determination of the opening of the second-stage pressure regulating valve. In this method, the determination of the opening of the second-stage pressure regulating valve is under the condition that the first-stage pressure regulating valve is fully open and the high-pressure gas source pressure is at half of the maximum working pressure of the air blowing test device. Only the opening of the second-stage pressure regulating valve determined in this state can achieve that when the air blowing test device is at the maximum working pressure, after the pressure regulation by the first-stage pressure regulating valve and then through the pressure reducing effect of the second-stage pressure regulating valve, the pressure after the second-stage pressure regulating valve is stabilized to the target pressure.

[0075] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0076] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A pressure regulation method for a series double pressure regulating valve air blowing test device, characterized in that: The air blowing test device comprises: a high-pressure gas tank, a quick valve, a primary pressure regulating valve, a secondary pressure regulating valve, a pressure sensor, a test section and a plurality of connecting pipes; the gas outlet of the high-pressure gas tank and one end of the quick valve, the other end of the quick valve and one end of the primary pressure regulating valve, the other end of the primary pressure regulating valve and one end of the secondary pressure regulating valve, and the other end of the secondary pressure regulating valve and the test section are all connected through connecting pipes, and the pressure sensor is installed on the connecting pipe between the secondary pressure regulating valve and the test section; The method comprises: Step 1: Check the actual pressure of the high-pressure gas tank, adjust the gas pressure in the high-pressure gas tank to half of the maximum gas source pressure designed for the air blowing test device, and proceed to step 2; Step 2: Adjust the first-stage pressure regulating valve to the fully open position and proceed to step 3; Step 3: Adjust the secondary pressure regulating valve to the fully closed position and proceed to step 4; Step 4: Open the quick valve, keep the first-stage pressure regulating valve in the fully open position, adjust the control parameters of the second-stage pressure regulating valve to stabilize the pressure after the second-stage pressure regulating valve at the target working pressure, and close the quick valve to proceed to step 5; Step 5: Determine whether the control parameters of the secondary pressure regulating valve meet the requirements of the pressure regulation accuracy after the valve. If yes, proceed to step 6. If not, return to step 4 and update the control parameters of the secondary pressure regulating valve. Step 6: debug the secondary pressure regulating valve according to the control parameters of the secondary pressure regulating valve that meet the requirements, obtain the pressure ratio between the front and rear of the secondary pressure regulating valve at different openings, obtain the first corresponding relationship between the pressure ratio and the opening of the secondary pressure regulating valve according to the pressure ratio between the front and rear of the secondary pressure regulating valve at different openings, and proceed to step 7; Step 7: Set the pressure before the secondary pressure regulating valve to half of the maximum gas source pressure designed for the air blowing test device, set the pressure after the secondary valve to the target working pressure, calculate the first opening of the secondary pressure regulating valve according to the first corresponding relationship, and proceed to step 8; Step 8: Adjust the gas pressure in the high-pressure gas tank to the maximum gas source pressure of the blowing test device, and proceed to step 9; Step 9: Position the secondary pressure regulating valve to the first opening, and proceed to step 10; Step 10: Operate the first-stage pressure regulating valve to the fully closed position and proceed to step 11; Step 11: After the gas pressure in the high-pressure gas tank reaches the maximum gas source pressure of the air blowing test device, the secondary pressure regulating valve is positioned to the first opening, and the primary pressure regulating valve is operated to the fully closed position, proceed to step 12; Step 12: Open the quick valve, keep the position of the secondary pressure regulating valve fixed, adjust the control parameters of the primary pressure regulating valve to stabilize the pressure after the secondary pressure regulating valve at the target working pressure, and close the quick valve, and proceed to step 13; Step 13: Determine whether the control parameters of the first-stage pressure regulating valve meet the pressure regulation accuracy requirements of the second-stage pressure regulating valve. If yes, proceed to step 14; if not, return to step 12 and update the control parameters of the first-stage pressure regulating valve. Step 14: debug the first-stage pressure regulating valve according to the control parameters of the first-stage pressure regulating valve that meet the requirements, obtain the pressure ratio of the first-stage pressure regulating valve before the first-stage pressure regulating valve and after the second-stage pressure regulating valve at different openings, and obtain the second corresponding relationship between the pressure ratio and the opening of the first-stage pressure regulating valve based on the pressure ratio of the first-stage pressure regulating valve before the first-stage pressure regulating valve and after the second-stage pressure regulating valve at different openings, and proceed to step 15; Step 15: adjusting the gas source pressure of the air blowing test device to the working range, calculating the second opening of the first-stage pressure regulating valve according to the second corresponding relationship and the actual pressure of the gas in the high-pressure gas tank, keeping the second-stage pressure regulating valve at the first opening, and proceeding to step 16; Step 16: Adjust the first-stage pressure regulating valve to the second opening, and adjust the second-stage pressure regulating valve to the first opening, and proceed to step 17; Step 17: Open the quick valve and proceed to step 18; Step 18: Keep the position of the secondary pressure regulating valve fixed, use the control parameters of the primary pressure regulating valve that meet the requirements obtained in step 14 to adjust the primary pressure regulating valve to achieve automatic pressure regulation after the secondary pressure regulating valve, and proceed to step 19; Step 19: Detect whether the position of the first-stage pressure regulating valve is fully open. If yes, proceed to step 20. If no, return to step 18 and update the control parameters of the first-stage pressure regulating valve. Step 20: Keep the position of the first-stage pressure regulating valve fixed to the fully open position, use the second-stage pressure regulating valve to achieve automatic pressure regulation of the pressure after the second-stage pressure regulating valve, and proceed to step 21; Step 21: Determine whether the test is completed or whether the gas pressure in the high-pressure gas tank is lower than the working pressure. If so, proceed to step 22; if not, proceed to step 21; Step 22: End the experiment.

2. The pressure regulation method of a series double pressure regulating valve air blowing test device according to claim 1 is characterized in that: According to the pressure ratio between the front and rear of the secondary pressure regulating valve at different openings, a first corresponding relationship between the pressure ratio and the opening is obtained by polynomial fitting.

3. The pressure regulation method of a series double pressure regulating valve air blowing test device according to claim 1 is characterized in that: Based on the pressure ratio between the pressure before and after the valve of the first-stage pressure regulating valve at different openings, a second corresponding relationship between the pressure ratio and the opening is obtained by polynomial fitting.

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