Ultrahigh-pressure quick-opening test system and method

Abstract

The invention belongs to the technical field of pneumatic control, and particularly discloses an ultrahigh-pressure quick-opening test system and method. The system comprises a gas source, a constant-value pressure reducing valve, a stop valve, a gas-liquid mixed pressure conversion device and an ultrahigh-pressure quick-opening device, the gas source provides two paths of gas flow, one path of gas flow outputs gas flow of a first pressure level through a fixed-value pressure reducing valve so as to provide driving gas flow for the gas-liquid mixed pressure conversion device; the other path of airflow outputs airflow of a second pressure level through a stop valve so as to provide compressed airflow for the gas-liquid mixing pressure conversion device; and the gas-liquid mixing pressure conversion device compresses internal liquid under the driving of the airflow at the first pressure level to generate hydraulic pressure at the target pressure level so as to compress the airflow at the second pressure level and generate the airflow at the target pressure level, so that the ultrahigh-pressure quick-opening device performs an ultrahigh-pressure quick-opening test under the airflow at the target pressure level. According to the invention, the ultrahigh-pressure gas source requirement of the ultrahigh-pressure quick-opening device can be met, and a quick-opening test in an ultrahigh-pressure state is realized.

Description

Technical Field

[0001] The present application belongs to the field of pneumatic control technology, and more specifically, relates to an ultra-high pressure quick-opening test system and method. Background Art

[0002] Pneumatic technology has the characteristics of low cost, no pollution, good speed and easy operation. It is widely used in various fields such as machinery manufacturing, shipbuilding, aerospace, etc.

[0003] The quick-opening device in an ultra-high-pressure quick-opening test system is a core control component in high-power pneumatic systems. It primarily controls opening and closing through its own pressure, thereby rapidly connecting or disconnecting the medium in the pipeline. Its applicable pressure range is 0 to 350 MPa. Therefore, ultra-high-pressure quick-opening tests within its applicable pressure range require an ultra-high-pressure (350 MPa) gas source.

[0004] Currently, the pressure of available air sources on the market typically does not exceed 50 MPa, which is insufficient to meet the ultra-high air pressure (350 MPa) required for ultra-high-pressure, quick-opening tests in high-power pneumatic systems. Furthermore, there is little research in the prior art on ultra-high-pressure air sources that meet these requirements. For example, patent publication CN119244784A discloses an ultra-high-pressure, large-diameter quick-opening control device, but it does not address the ultra-high-pressure air source required for the device or the ultra-high-pressure quick-opening test.

[0005] Therefore, the industry is in urgent need of an ultra-high pressure quick-opening test system and method to realize the quick-opening test of the quick-opening device under ultra-high pressure state. Summary of the Invention

[0006] In response to the defects of the existing technology, the purpose of this application is to provide an ultra-high pressure quick opening test system and method, aiming to solve the problem that there is little research on ultra-high pressure gas sources in the existing technology and it is impossible to realize the quick opening test of the quick opening device under ultra-high pressure state.

[0007] To achieve the above objectives, in a first aspect, the present application provides an ultra-high pressure quick opening test system, comprising: Gas source, fixed value pressure reducing valve, stop valve, gas-liquid mixed pressure conversion device and ultra-high pressure quick opening device; The outlet end of the gas source is connected to the inlet end of the fixed-value pressure reducing valve and the inlet end of the stop valve respectively; the outlet end of the fixed-value pressure reducing valve is connected to the first inlet end of the gas-liquid mixed pressure conversion device; the outlet end of the stop valve is connected to the second inlet end of the gas-liquid mixed pressure conversion device; the outlet end of the gas-liquid mixed pressure conversion device is connected to the three inlet ends of the ultra-high pressure quick opening device in three ways; The gas source is used to provide two air flows, one of which is to output an air flow of a first pressure level through a fixed-value pressure reducing valve to provide a driving air flow for the gas-liquid mixed pressure conversion device; the other air flow is to output an air flow of a second pressure level through the stop valve to provide a compressed air flow for the gas-liquid mixed pressure conversion device; The gas-liquid mixed pressure conversion device is used to compress the internal liquid under the drive of the airflow of the first pressure level to generate hydraulic pressure of the target pressure level to compress the airflow of the second pressure level. The airflow of the target pressure level is generated and enters the ultra-high pressure quick-opening device in three ways, one way enters the inlet chamber of the ultra-high pressure quick-opening device, and the other two ways enter the control chamber and back pressure chamber of the ultra-high pressure quick-opening device respectively, so that the ultra-high pressure quick-opening device performs an ultra-high pressure quick-opening test under the airflow of the target pressure level; The first pressure level is lower than the second pressure level, and the second pressure level is lower than the target pressure level.

[0008] Optionally, the gas-liquid mixed pressure conversion device includes a water tank, a gas-liquid booster pump, a liquid-gas booster cylinder, a pressure start valve and a constant ratio pressure reducing valve; The first inlet end of the gas-liquid booster pump serves as the first inlet end of the gas-liquid mixed pressure conversion device, the first inlet end of the liquid-gas booster cylinder serves as the second inlet end of the gas-liquid mixed pressure conversion device, and the outlet end of the liquid-gas booster cylinder serves as the outlet end of the gas-liquid mixed pressure conversion device; The outlet end of the water tank is connected to the second inlet end of the gas-liquid booster pump, and the outlet end of the gas-liquid booster pump is connected to the second inlet end of the liquid-gas booster cylinder; the inlet end of the ultra-high pressure quick opening device includes a first inlet end, a second inlet end and a third inlet end, wherein the first inlet end is in communication with the inlet cavity, the second inlet end is in communication with the control cavity, and the third inlet end is in communication with the back pressure cavity; The outlet end of the liquid-gas booster cylinder is divided into three paths, one of which is connected to the first inlet end of the ultra-high pressure quick opening device, and the other two paths are connected to the second inlet end and the third inlet end through the pressure start valve and the constant ratio pressure reducing valve respectively; The gas-liquid booster pump is used to compress the water input from the water tank under the drive of the airflow at the first pressure level to generate a water flow at the target pressure level; The liquid-gas booster cylinder is used to compress the airflow of the second pressure level under the hydraulic action generated by the water flow of the target pressure level, generating the airflow of the target pressure level, one path of which enters the inlet chamber of the ultra-high pressure quick-opening device, and the other two paths enter the control chamber and the back pressure chamber respectively through the pressure starting valve and the constant ratio pressure reducing valve.

[0009] Optionally, the gas-liquid booster pump is a reciprocating gas-liquid booster pump, or a diaphragm gas-liquid booster pump, or a plunger gas-liquid booster pump.

[0010] Optionally, it further comprises: a pressure relief valve, a first ultra-high pressure sensor, a second ultra-high pressure sensor, and a third ultra-high pressure sensor; the back pressure chamber is connected to the external atmosphere through the pressure relief valve; The first ultra-high pressure sensor is provided on the gas path between the outlet end of the gas-liquid mixed pressure conversion device and the inlet chamber, and is used to monitor the pressure change of the gas flow output by the gas-liquid mixed pressure conversion device; The second ultra-high pressure sensor is provided on the air path between the outlet end of the pressure start valve and the control chamber, and is used to monitor the pressure change of the control chamber; The third ultra-high pressure sensor is arranged on the air path between the outlet end of the constant ratio pressure reducing valve and the back pressure chamber, and is used to monitor the pressure change of the back pressure chamber.

[0011] In a second aspect, the present application provides a test method applied to any of the aforementioned ultra-high pressure fast opening test systems, comprising: Determine a first air mass flow model from the outlet of the gas-liquid mixed pressure conversion device to the inlet of the ultra-high pressure quick opening device and a first airflow density model at the outlet of the gas-liquid mixed pressure conversion device; Determine a second air mass flow model for each air path within the ultra-high pressure quick-opening device and a second air flow density model for each cavity; Determining a dynamic model of the valve core based on the displacement of the valve core of the ultra-high pressure quick-opening device and the friction force it experiences, the pressure of each cavity, and the force-bearing area of ​​each cavity during the opening process; Using the air mass of the second pressure level airflow filled into the gas-liquid mixed pressure conversion device and the air mass flow required by the ultra-high pressure quick-opening device during the opening process, the first air mass flow model, the first air flow density model, each second air mass flow model / each second air flow density model and the dynamic model of the valve core are jointly solved to determine the change results of the quick-opening parameters of the ultra-high pressure quick-opening device.

[0012] Optionally, the gas-liquid mixed pressure conversion device includes a liquid-gas booster cylinder; the first air mass flow model from the outlet of the gas-liquid mixed pressure conversion device to the inlet of the ultra-high pressure quick opening device and the first airflow density model at the outlet of the gas-liquid mixed pressure conversion device include: A first air mass flow model from the outlet of the liquid-gas boosting cylinder to the inlet of the ultra-high pressure quick opening device and a first air flow density model from the outlet of the liquid-gas boosting cylinder are determined.

[0013] Optionally, each chamber inside the ultra-high pressure quick opening device includes a back pressure chamber, a control chamber, an inlet chamber and an outlet chamber; The second air mass flow model of each air path includes an air mass flow model from the back pressure chamber of the ultra-high pressure quick opening device to the atmosphere, an air mass flow model of the control chamber of the ultra-high pressure quick opening device, an air mass flow model from the inlet chamber of the ultra-high pressure quick opening device to its outlet chamber, and an air mass flow model from the outlet chamber of the ultra-high pressure quick opening device to the atmosphere.

[0014] Optionally, the second airflow density model of each cavity includes the airflow density model of the back pressure cavity, the airflow density model of the control cavity, the airflow density model of the inlet cavity and the airflow density model of the outlet cavity of the ultra-high pressure quick opening device.

[0015] Optionally, the dynamic model of the valve core of the ultra-high pressure quick-opening device is determined according to the following equation: ; Where, is the mass of the valve core, is the pressure of the control chamber; is the force-bearing area of ​​the control chamber during the opening process; is the pressure of the outlet chamber of the ultra-high pressure quick opening device; is the force area of ​​the valve core during the opening process; is the pressure of the back pressure chamber; is the force-bearing area of ​​the back pressure chamber during the opening process; is the stiffness of the spring in the ultra-high pressure quick opening device; is the displacement of the valve core; is the second-order derivative of the displacement of the valve core with respect to time; is the initial compression amount of the spring in the ultra-high pressure quick opening device; is the friction force on the valve core.

[0016] Optionally, the second air mass flow model of each gas path inside the ultra-high pressure quick opening device is determined according to the following equation: ; Where, is the air mass flow rate; is the flow coefficient; is the equivalent flow area of ​​the gas path; is the pressure at the gas inlet; is the pressure at the gas outlet; is the air constant; is the adiabatic index of the air at the gas path inlet; is the temperature of the gas path inlet; is the compressibility factor of the air at the gas path inlet; is the critical pressure ratio of air.

[0017] In general, the above technical solutions conceived by this application have the following beneficial effects compared with the existing technologies: The present application provides an ultra-high pressure quick-opening test system and method. The ultra-high pressure quick-opening test system is constructed by utilizing an air source, a fixed-value pressure reducing valve, a stop valve, a gas-liquid mixed pressure conversion device and an ultra-high pressure quick-opening device. The gas-liquid mixed pressure conversion device is introduced, and a gas-liquid-gas pressure transmission method is adopted. Low-pressure air is used as the driving medium and ultra-high pressure liquid is used as the transmission medium. Ultra-high pressure air is generated through isobaric conversion of liquid and air. The system has high safety and convenient operation. The expansion performance of compressed air can meet the ultra-high pressure gas source demand of the ultra-high pressure quick-opening device, thereby realizing a quick opening test of the quick-opening device under an ultra-high pressure state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is one of the structural diagrams of the ultra-high pressure quick opening test system provided in the embodiment of the present application; Figure 2 This is the second structural diagram of the ultra-high pressure fast opening test system provided in the embodiment of the present application; Figure 3 This is a schematic diagram of the internal structure of the ultra-high pressure quick opening device of an embodiment of the present application; Figure 4 This is a flow chart of a test method of an ultra-high pressure quick opening test system according to an embodiment of the present application; Figure 5 Schematic diagram of the initial state of the opening test of the ultra-high pressure quick opening device of the embodiment of the present application; Figure 6 Schematic diagram of the opening process of the ultra-high pressure quick opening device opening test according to an embodiment of the present application; Figure 7 1. It is a schematic diagram of the fully open state of the opening test of the ultra-high pressure quick opening device of the embodiment of the present application; Figure 8 (a) is a schematic diagram of the pressure change of the control chamber (chamber b) in the ultra-high pressure quick opening device, (b) is a schematic diagram of the pressure change of its back pressure chamber (chamber a), (c) is a schematic diagram of the pressure change of its outlet chamber, (d) is a schematic diagram of the pressure change of its inlet chamber (i.e., the inlet chamber), (e) is a schematic diagram of the pressure change of the outlet chamber of the liquid-gas booster cylinder, and (f) is a schematic diagram of the displacement change of the valve core in the ultra-high pressure quick opening device. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0020] In the specification and claims of this application, the terms "first" and "second" are used to distinguish different objects, rather than to describe a specific order of objects. For example, "first response message" and "second response message" are used to distinguish different response messages, rather than to describe a specific order of response messages.

[0021] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0022] In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more, for example, multiple processing units means two or more processing units, etc.; multiple elements means two or more elements, etc.

[0023] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0024] Figure 1 This is one of the structural diagrams of the ultra-high pressure fast opening test system provided in the embodiment of the present application, such as Figure 1 As shown, the ultra-high pressure quick opening test system includes: Gas source 1, fixed value pressure reducing valve 2, stop valve 3, gas-liquid mixed pressure conversion device 4 and ultra-high pressure quick opening device 5; The outlet end of the gas source 1 is connected to the inlet end of the fixed-value pressure reducing valve 2 and the inlet end of the stop valve 3 respectively; the outlet end of the fixed-value pressure reducing valve 2 is connected to the first inlet end of the gas-liquid mixed pressure conversion device 4; the outlet end of the stop valve 3 is connected to the second inlet end of the gas-liquid mixed pressure conversion device 4; the outlet end of the gas-liquid mixed pressure conversion device 4 is connected in three ways to the three inlet ends of the ultra-high pressure quick opening device 5 respectively; The gas source 1 is used to provide two air flows. One air flow outputs an air flow of a first pressure level through the fixed-value pressure reducing valve 2 to provide a driving air flow to the gas-liquid mixed pressure conversion device 4; the other air flow outputs an air flow of a second pressure level through the stop valve 3 to provide a compressed air flow to the gas-liquid mixed pressure conversion device 4. The gas-liquid mixed pressure conversion device 4 is used to compress the internal liquid under the drive of the airflow at the first pressure level to generate hydraulic pressure at the target pressure level, so as to compress the airflow at the second pressure level. The airflow at the target pressure level is generated and enters the ultra-high pressure quick-opening device in three ways, one way enters the inlet chamber of the ultra-high pressure quick-opening device, and the other two ways enter the control chamber and back pressure chamber of the ultra-high pressure quick-opening device respectively, so that the ultra-high pressure quick-opening device 5 can perform the ultra-high pressure quick-opening test under the airflow at the target pressure level; The first pressure level is lower than the second pressure level, and the second pressure level is lower than the target pressure level.

[0025] Specifically, the first pressure level described in the embodiment of the present application refers to the pressure level of the air flow provided by the air source after the air flow is reduced in pressure by the fixed-value pressure reducing valve, which is used to characterize the low-pressure air flow. For example, it can be specifically set to 0.8 MPa.

[0026] The second pressure level described in the embodiment of the present application refers to the pressure level of the airflow provided by the air source, which is used to characterize the high-pressure airflow. For example, it can be specifically set to 30 MPa.

[0027] The target pressure level described in the embodiment of the present application refers to the pressure level of the ultra-high pressure gas source required by the system output by the gas-liquid mixed pressure conversion device, which is used to characterize the ultra-high pressure gas flow and can be specifically set to 350 MPa.

[0028] In the embodiment of the present application, the gas source can be a high-pressure gas source of 30Mpa. By connecting the outlet end of the gas source to the inlet end of the fixed-value pressure reducing valve and the inlet end of the stop valve respectively, the outlet end of the fixed-value pressure reducing valve is connected to the first inlet end of the gas-liquid mixed pressure conversion device; the outlet end of the stop valve is connected to the second inlet end of the gas-liquid mixed pressure conversion device. In this way, the gas source can provide two airflows. One airflow is reduced in pressure by the fixed-value pressure reducing valve and outputs a low-pressure airflow such as 0.8Mpa, that is, outputs an airflow of the first pressure level. The low-pressure airflow can be further output to the gas-liquid mixed pressure conversion device to provide it with a low-pressure airflow input for use in driving the device. The other airflow can be output through the conduction of the stop valve as a high-pressure airflow such as 30Mpa, that is, an airflow of the second pressure level, to provide a compressed airflow input to the gas-liquid mixed pressure conversion device for the device to compress and pressurize it.

[0029] In the embodiment of the present application, the gas-liquid mixed pressure conversion device can realize the gas-liquid-gas pressure transmission mode, which can be assembled by using the gas-liquid booster mechanism and the liquid-gas booster mechanism. The liquid mixed pressure conversion device can be driven by a low-pressure gas flow such as 0.8Mpa to start working, and repeatedly compress the liquid filled in the device, so as to generate a target pressure level of 350Mpa hydraulic pressure, and then generate a target pressure level of 350Mpa gas flow through the high-pressure gas flow input by the compression device, the isobaric conversion of the liquid and air.

[0030] Further, by dividing the outlet end of the gas-liquid mixed pressure conversion device into three paths and connecting with the three inlet ends of the superhigh-pressure quick-opening device, the device can provide a continuous supply of superhigh-pressure gas source for the superhigh-pressure quick-opening device, one path enters the inlet cavity of the superhigh-pressure quick-opening device, and the other two paths enter the control cavity and the back pressure cavity of the superhigh-pressure quick-opening device respectively, so that the superhigh-pressure quick-opening device can effectively perform and complete the superhigh-pressure quick-opening test under the action of 350Mpa gas flow, and can ensure that the superhigh-pressure quick-opening device meets the index requirements of superhigh pressure (350MPa) and rapid opening (5ms).

[0031] It should be noted that the superhigh-pressure quick-opening device can use the existing superhigh-pressure quick-opening device, and the specific structure and principle can refer to the introduction of the prior art, which will not be expanded in the present application.

[0032] Among them, the superhigh-pressure quick-opening device suitable for the system can be a superhigh-pressure quick-opening device with a maximum nominal diameter of DN85 and below.

[0033] The superhigh-pressure quick-opening test system of the embodiment of the present application constructs the superhigh-pressure quick-opening test system by using the gas source, the constant value pressure reducing valve, the stop valve, the gas-liquid mixed pressure conversion device and the superhigh-pressure quick-opening device, introduces the gas-liquid mixed pressure conversion device, adopts the gas-liquid-gas pressure transmission mode, uses low-pressure air as the driving medium and superhigh-pressure liquid as the transmission medium, and generates superhigh-pressure air through the isobaric conversion of the liquid and air. It is safe and convenient to operate, and can meet the demand of superhigh-pressure gas source of the superhigh-pressure quick-opening device by using the expansion performance of compressed air, and then realizes the quick-opening test of the quick-opening device under the superhigh-pressure state.

[0034] Figure 2 is a structure schematic diagram of the superhigh-pressure quick-opening test system provided by the embodiment of the present application, as shown in Figure 2 In the embodiment of the present application, the gas-liquid mixed pressure conversion device 4 includes a water tank 41, a gas-liquid booster pump 42, a liquid-gas booster cylinder 43, a pressure starting valve 44 and a constant ratio pressure reducing valve 45. The first inlet end of the gas-liquid booster pump 42 serves as the first inlet end of the gas-liquid mixed pressure conversion device 4, the first inlet end of the liquid-gas booster cylinder 43 serves as the second inlet end of the gas-liquid mixed pressure conversion device 4, and the outlet end of the liquid-gas booster cylinder 43 serves as the outlet end of the gas-liquid mixed pressure conversion device 4; The outlet end of the water tank 41 is connected to the second inlet end of the gas-liquid booster pump 42, and the outlet end of the gas-liquid booster pump 42 is connected to the second inlet end of the liquid-gas booster cylinder 43; the inlet end of the ultra-high pressure quick opening device 5 includes a first inlet end, a second inlet end, and a third inlet end, wherein the first inlet end is connected to the inlet chamber 51, the second inlet end is connected to the control chamber 52, and the third inlet end is connected to the back pressure chamber 53; The outlet of the liquid-gas booster cylinder 43 is divided into three paths. One path is connected to the first inlet of the ultra-high pressure quick opening device 5, and the other two paths are connected to the second inlet and the third inlet via the pressure start valve 44 and the constant ratio pressure reducing valve 45 respectively. The gas-liquid booster pump 42 is used to compress the water input from the water tank 41 under the drive of the air flow at the first pressure level to generate a water flow at the target pressure level; The liquid-gas booster cylinder 43 is used to compress the airflow of the second pressure level under the hydraulic action generated by the input water flow of the target pressure level, generating an airflow of the target pressure level. One path enters the inlet chamber 51 of the ultra-high pressure quick-opening device 5, and the other two paths enter the control chamber 52 and the back pressure chamber 53 through the pressure starting valve 44 and the constant ratio pressure reducing valve 45 respectively.

[0035] Specifically, in an embodiment of the present application, a gas-liquid mixed pressure conversion device can be constructed using a water tank, a gas-liquid booster pump, and a liquid-gas booster cylinder. The first inlet of the gas-liquid booster pump serves as the first inlet of the gas-liquid mixed pressure conversion device, the first inlet of the liquid-gas booster cylinder serves as the second inlet of the gas-liquid mixed pressure conversion device, and the outlet of the liquid-gas booster cylinder serves as the outlet of the gas-liquid mixed pressure conversion device. Furthermore, the outlet of the water tank is connected to the second inlet of the gas-liquid booster pump, and the outlet of the gas-liquid booster pump is connected to the second inlet of the liquid-gas booster cylinder. The boost ratio of the gas-liquid booster pump can be selected as 500:1, and the boost ratio of the liquid-gas booster cylinder can be selected as 1:1.

[0036] Based on the contents of the above embodiments, as an optional embodiment, the gas-liquid booster pump is a reciprocating gas-liquid booster pump, or a diaphragm gas-liquid booster pump, or a plunger gas-liquid booster pump.

[0037] A reciprocating gas-liquid booster pump is a type of gas-liquid booster pump that utilizes the low-pressure gas driving surface of a large piston end to convert it into high-pressure liquid at a smaller piston end, achieving liquid pressure boosting through the area ratio. It features high output pressure and large output flow, making it suitable for a variety of media. The boost ratio is adjustable, and the output pressure can be easily adjusted by varying the area ratio of the pneumatic piston to the hydraulic plunger.

[0038] Diaphragm gas-liquid booster pumps use compressed air as their power source, boosting liquid pressure through the reciprocating motion of a diaphragm. During operation, external pressurized air flows through a control valve into the pump body, pushing the diaphragm and changing the volume of the pump chamber. This converts the energy of the low-pressure gas into the pressure energy of the liquid, achieving liquid boosting. They offer excellent sealing properties, effectively isolating the liquid from the drive mechanism to prevent leakage and wear. They are also easy to maintain, with a simple structure that facilitates cleaning and maintenance.

[0039] Plunger-type gas-liquid booster pumps also use compressed air as their power source. Reciprocating motion of the plunger within the cylinder changes the volume of the sealed working chamber to draw in or compress liquid, thereby increasing the pressure of the gas and liquid. They offer high rated pressure, compact structure, high efficiency, and easy flow regulation.

[0040] In the system of the embodiment of the present application, the type of gas-liquid booster pump can be selected according to the needs of the actual application, which can improve the convenience and flexibility of the construction of the gas-liquid mixed pressure conversion device. In the embodiment of the present application, the gas source provides two airflows. One airflow outputs an airflow of a first pressure level through a fixed-value pressure reducing valve, i.e., a low-pressure airflow. This low-pressure airflow is then transmitted to the gas-liquid booster pump to provide it with a driving airflow; the other airflow can be transmitted to the liquid-gas booster cylinder through the conduction of the stop valve, providing the liquid-gas booster cylinder with an airflow of a second pressure level, i.e., a high-pressure airflow.

[0041] Furthermore, in the embodiments of the present application, the water tank provides a water source for the gas-liquid booster pump. After the low-pressure airflow is transmitted to the gas-liquid booster pump, it is driven to operate, compressing the water pre-filled from the water tank. By repeatedly compressing the water, the pressure is increased, ultimately generating a water flow at the target pressure level, namely, an ultra-high-pressure water flow of 350 MPa.

[0042] In an embodiment of the present application, the inlet end of the ultra-high pressure quick opening device includes a first inlet end, a second inlet end and a third inlet end, wherein the first inlet end is connected to the inlet chamber, the second inlet end is connected to the control chamber, and the third inlet end is connected to the back pressure chamber; the outlet end of the liquid-gas booster cylinder is divided into three paths, one of which is connected to the first inlet end of the ultra-high pressure quick opening device, and the other two paths are connected to the second inlet end and the third inlet end respectively through a pressure start valve and a constant ratio pressure reducing valve, so that the ultra-high pressure water flow will be transmitted to the liquid-gas booster cylinder, driving the liquid-gas booster cylinder to work, so that under the hydraulic action generated by the ultra-high pressure water flow, the high pressure air flow pre-filled inside is compressed, and finally an air flow of the target pressure level is generated, that is, an ultra-high pressure gas source of 350 MPa is obtained. Then the ultra-high pressure gas source is divided into three paths, one of which enters the inlet chamber of the ultra-high pressure quick opening device, and the other two paths enter the control chamber and the back pressure chamber respectively through the pressure start valve and the constant ratio pressure reducing valve, so as to provide the ultra-high pressure quick opening device for quick opening test.

[0043] The system of the embodiment of the present application can effectively realize the gas-liquid-gas pressure transmission method by adopting a gas-liquid booster pump and a liquid-gas booster cylinder to construct a gas-liquid mixed pressure conversion device; by using low-pressure air as the driving medium and ultra-high-pressure water as the transmission medium, ultra-high-pressure airflow is generated through the isobaric conversion of water and air. It has a simple structure, is economical and reliable, easy to operate, and highly safe.

[0044] Continue to refer to Figure 2 Based on the above embodiment, as an optional embodiment, the system further includes: a pressure relief valve 9, a first ultra-high pressure sensor 6, a second ultra-high pressure sensor 7, and a third ultra-high pressure sensor 8; the back pressure chamber 53 is connected to the external atmosphere through the pressure relief valve 11; The first ultra-high pressure sensor 6 is provided on the gas path between the outlet end of the gas-liquid mixed pressure conversion device 4 and the inlet chamber 51, and is used to monitor the pressure change of the gas-liquid mixed pressure conversion device 4 output airflow; The second ultra-high pressure sensor 7 is provided on the gas path between the outlet of the pressure start valve 44 and the control chamber 52, and is used to monitor the pressure change of the control chamber 52; The third ultra-high pressure sensor 8 is provided in the air path between the outlet end of the proportional pressure reducing valve 45 and the back pressure chamber 53 , and is used to monitor the pressure change in the back pressure chamber 53 .

[0045] Specifically, in an embodiment of the present application, after the gas-liquid mixed pressure conversion device generates an airflow of the target pressure level, the ultra-high pressure airflow will be divided into three airflows, one of which directly enters the inlet chamber of the ultra-high pressure quick-opening device, and the other two enter the control chamber and back pressure chamber of the ultra-high pressure quick-opening device through the pressure start valve and the constant ratio pressure reducing valve respectively, so that the ultra-high pressure quick-opening device can perform an ultra-high pressure quick-opening test under ultra-high pressure airflow.

[0046] More specifically, after the ultra-high-pressure gas enters the ultra-high-pressure quick-opening device, it passes through the constant-ratio pressure-reducing valve, where it is reduced in pressure before entering the back-pressure chamber and then directly into the inlet chamber. The pressure in the back-pressure chamber acts on the valve core, creating a seal between the valve core and the valve seat. This prevents the ultra-high-pressure gas in the inlet chamber from reaching the outlet, thus achieving a reliable seal for the quick-opening control device.

[0047] like Figure 3 As shown in the schematic diagram of the structure inside the ultra-high pressure quick opening device 5, it includes an inlet chamber 51, a control chamber 52, a back pressure chamber 53 and an outlet chamber 54. At the same time, the ultra-high pressure quick opening device 5 specifically includes a spring 55 and a valve core 56. Then, when the ultra-high pressure gas source pressure increases to the opening pressure set by the ultra-high pressure quick opening device, the high pressure gas flows into the control chamber 52 through the pressure start valve. Under the action of the gas pressure, the valve core of the pressure start valve 44 overcomes the spring force of the pressure start spring in the pressure start valve 44 and moves upward. The pressure start valve 44 opens, and the ultra-high pressure gas flows from the inlet chamber 51 through the pressure start valve 44 into the control chamber 52. Since the pressure in the back pressure chamber 53 is much lower than the pressure in the control chamber 52, the main valve core 56 moves upward under the pressure of the control chamber 52, overcoming the pressure in the back pressure chamber 53 and the spring force of the main valve spring 55. The main valve opens, and the main valve core 56 and the valve seat are no longer sealed. The gas in the inlet chamber 51 flows along the gap between the main valve core 56 and the valve seat to the outlet, while acting on the main valve core 56. Then, due to the expansion of the net effective area of ​​the air pressure on the main valve core 56, the main valve core 56 will accelerate upward movement, and as the main valve core 56 continues to move upward. When the device is opened, under the action of the ultra-high pressure airflow input from the inlet chamber 51, the force acting on the control chamber 52 and the valve core 56 overcomes the thrust of the spring 55 on the valve core 56, the pressure in the back pressure chamber 53, and the friction force experienced by the valve core 56 during movement, causing the valve core 56 to shift and quickly open.

[0048] Among them, by setting the first ultra-high pressure pressure sensor on the air path between the outlet end of the gas-liquid mixed pressure conversion device and the inlet chamber of the ultra-high pressure quick opening device, the pressure change of the output airflow of the gas-liquid mixed pressure conversion device can be monitored in real time; by setting the second ultra-high pressure pressure sensor on the air path between the outlet end of the pressure starting valve and the control chamber of the ultra-high pressure quick opening device, the pressure change of the control chamber in the ultra-high pressure quick opening device can be monitored in real time; by setting the third ultra-high pressure pressure sensor on the air path between the outlet end of the constant ratio pressure reducing valve and the back pressure chamber of the ultra-high pressure quick opening device, the pressure change of the back pressure chamber in the ultra-high pressure quick opening device can be monitored in real time.

[0049] The system of the embodiment of the present application, by setting multiple ultra-high pressure pressure sensors on the gas path between the outlet end of the gas-liquid mixed pressure conversion device and the ultra-high pressure quick-opening device, monitors in real time the pressure changes of the output airflow of the gas-liquid mixed pressure conversion device, as well as the pressure changes of the inlet chamber, control chamber and back pressure chamber in the ultra-high pressure quick-opening device, thereby realizing the visualization of the opening pressure and opening time of the quick-opening device.

[0050] The test method of the ultra-high pressure quick opening test system provided in this application is described below. The test method of the ultra-high pressure quick opening test system described below can be referenced to the ultra-high pressure quick opening test system described above.

[0051] Figure 4 This is a flow chart of the test method of the ultra-high pressure quick opening test system of the embodiment of the present application. It can be understood that it can be applied to any of the ultra-high pressure quick opening test systems described above, such as Figure 4 As shown, the method includes: Step S1, determining a first air mass flow model from the outlet of the gas-liquid mixed pressure conversion device to the inlet of the ultra-high pressure quick opening device and a first airflow density model at the outlet of the gas-liquid mixed pressure conversion device; Step S2, determining a second air mass flow model of each air path inside the ultra-high pressure quick opening device and a second air flow density model of each cavity; Step S3, determining a dynamic model of the valve core based on the displacement of the valve core of the ultra-high pressure quick opening device and the friction force it is subjected to, the pressure of each cavity, and the force area of ​​each cavity during the opening process; In step S4, the first air mass flow model, the first air flow density model, each second air mass flow model, each second air flow density model and the dynamic model of the valve core are jointly solved using the air mass of the second pressure level airflow filled into the gas-liquid mixed pressure conversion device and the air mass flow required by the ultra-high pressure quick opening device during the opening process to determine the change results of the quick opening parameters of the ultra-high pressure quick opening device.

[0052] Specifically, the first air mass flow model described in the embodiment of the present application refers to the air mass flow model of the gas path from the outlet end of the gas-liquid mixed pressure conversion device to the inlet end of the ultra-high pressure quick opening device.

[0053] The first airflow density model described in the embodiment of the present application refers to the airflow density model of the outlet end or outlet cavity of the gas-liquid mixing pressure conversion device.

[0054] The second air mass flow model described in the embodiment of the present application refers to the air mass flow model of each air path preset inside the ultra-high pressure quick opening device.

[0055] The second airflow density model described in the embodiment of the present application refers to the airflow density model of each cavity preset inside the ultra-high pressure quick opening device.

[0056] In an embodiment of the present application, in step S1, through fluid mechanics analysis, a first air mass flow model from the outlet end (or outlet cavity) of the gas-liquid mixed pressure conversion device to the inlet end (or inlet cavity) of the ultra-high pressure quick opening device and a first airflow density model at the outlet end of the gas-liquid mixed pressure conversion device can be determined.

[0057] Based on the content of the above embodiment, as an optional embodiment, the gas-liquid mixed pressure conversion device includes a liquid-gas booster cylinder; determining a first air mass flow model from the outlet end of the gas-liquid mixed pressure conversion device to the inlet end of the ultra-high pressure quick opening device and a first airflow density model at the outlet end of the gas-liquid mixed pressure conversion device includes: Determine a first air mass flow model from the outlet of the liquid-gas booster cylinder to the inlet of the ultra-high pressure quick opening device and a first air flow density model at the outlet of the liquid-gas booster cylinder.

[0058] Specifically, in an embodiment of the present application, the gas-liquid mixed pressure conversion device includes a liquid-gas booster cylinder, a water tank, and a gas-liquid booster pump. The outlet end of the water tank is connected to the second inlet end of the gas-liquid booster pump, and the outlet end of the gas-liquid booster pump is connected to the second inlet end of the liquid-gas booster cylinder. The gas-liquid booster pump can compress the water input from the water tank under the drive of the air flow of the first pressure level to generate a water flow of the target pressure level. In this way, the liquid-gas booster cylinder compresses the air flow of the second pressure level under the hydraulic action generated by the water flow input at the target pressure level to generate an air flow of the target pressure level. Furthermore, through fluid mechanics analysis, the air mass flow calculation model in the ultra-high pressure quick opening test system can be determined.

[0059] Based on the content of the above embodiment, as an optional embodiment, the second air mass flow model of each gas path inside the ultra-high pressure quick opening device is determined according to the following equation: ; (1) Where, is the air mass flow rate; is the flow coefficient; is the equivalent flow area of ​​the gas path; is the pressure at the gas inlet; is the pressure at the gas outlet; is the air constant; is the adiabatic index of the air at the gas path inlet; is the temperature of the gas path inlet; is the compressibility factor of the air at the gas path inlet; is the critical pressure ratio of air.

[0060] Based on the flow calculation model (1), a calculation model for the air mass flow rate input and output between the valve components of the ultra-high pressure quick opening test system during the opening process can be derived. Based on the air mass flow rate input and output between the components of the ultra-high pressure quick opening test system during the opening process, the initial state of each cavity, and the volume change of each valve component during the opening process, the density calculation formula of each cavity can be written; based on the mutual coupling relationship between parameters such as temperature, density, and pressure, the change value of each parameter during the opening process can be obtained by querying the physical parameter database.

[0061] Correspondingly, the air mass flow model from the outlet chamber of the liquid-gas booster cylinder to the inlet chamber of the ultra-high pressure quick opening device can be expressed as: ; (2) At the same time, through the analysis of airflow density, the first airflow density model of the outlet cavity of the liquid-gas booster cylinder can be expressed as: ; (3) in, The input mass flow rate from the outlet chamber of the liquid-gas booster cylinder to the inlet chamber of the ultra-high pressure quick opening device; is the flow coefficient; It is the equivalent flow area from the outlet cavity of the liquid-gas booster cylinder to the inlet cavity of the ultra-high pressure quick opening device; is the pressure of the outlet chamber of the liquid-gas booster cylinder; is the inlet chamber pressure of the ultra-high pressure quick opening device; R is the air constant; is the adiabatic index of the air in the outlet chamber of the liquid-gas booster cylinder; is the outlet chamber temperature of the liquid-gas booster cylinder; is the compression factor of the air in the outlet chamber of the liquid-gas booster cylinder; is the critical pressure strength ratio of air; is the density of the outlet cavity of the liquid-gas booster cylinder; The density of the outlet chamber of the liquid-gas booster cylinder before opening; is the outlet volume of the liquid-gas booster cylinder.

[0062] It should be noted that before step S1, the volume of the liquid-gas booster cylinder can be determined based on the mass of the air initially charged into the gas-liquid mixed pressure conversion device at the second pressure level. Since the mass of the air charged into the liquid-gas booster cylinder remains unchanged before and after the boost, the mass of the air charged into the liquid-gas booster cylinder can be determined based on the initial inlet volume of the ultra-high pressure quick opening device, the expansion of the inlet volume during the opening process, and the density of the ultra-high pressure air (350 MPa), as follows: ; (4) in, is the density of the air initially charged into the liquid-gas booster cylinder; The volume of air filled in the liquid-gas pressure cylinder, i.e. the inlet volume before the opening of the super-high pressure quick opening device and the volume of the liquid-gas pressure cylinder . The density of air filled in the liquid-gas pressure cylinder when the air is pressurized to 350 MPa; The volume of air filled in the liquid-gas pressure cylinder when the air is pressurized to 350 MPa, in order to prevent the opening time requirement from being unable to be met, The inlet volume before the opening of the super-high pressure quick opening device , the outlet volume expansion value of the super-high pressure quick opening device during the opening process and the outlet cavity .

[0063] Therefore, according to the mass of air filled in the liquid-gas pressure cylinder, the volume of the liquid-gas pressure cylinder can be determined.

[0064] Secondly, the mass flow rate of air required by the super-high pressure quick opening device during the opening process is determined.

[0065] Here, the highest working pressure of the super-high pressure quick opening device is 350 MPa, and the opening time thereof should reach 5 ms, so the mass flow rate of air required by the super-high pressure quick opening device during the opening process can be expressed as: ; (5) wherein, is the mass flow rate of air filled in the liquid-gas pressure cylinder, is the outlet volume expansion value of the super-high pressure quick opening device during the opening process and the outlet cavity , and t is the opening time of the super-high pressure quick opening device.

[0066] Here, it should be noted that the input mass flow rate of the inlet cavity of the super-high pressure quick opening device should be greater than or equal to the air flow required by the super-high pressure quick opening device during the opening process , so as to ensure the opening time of the super-high pressure quick opening device. The ratio of the pressure in the inlet cavity of the super-high pressure quick opening device after the opening to the pressure in the outlet cavity of the liquid-gas pressure cylinder is less than the critical pressure ratio of air. Based on the input mass flow rate of the inlet cavity of the super-high pressure quick opening device, the pressure in the inlet cavity before and after the opening, and other parameters, the equivalent flow area of the liquid-gas pressure cylinder to the super-high pressure quick opening device can be obtained according to the model equation (2) .

[0067] Further, in the embodiment of the present application, in step S2, a second air mass flow rate model of each gas path inside the super-high pressure quick opening device and a second air flow density model of each cavity are determined.

[0068] Based on the content of the above embodiment, as an optional embodiment, the various chambers inside the ultra-high pressure quick opening device include a back pressure chamber, a control chamber, an inlet chamber and an outlet chamber; The second air mass flow model of each air path includes the air mass flow model from the back pressure chamber of the ultra-high pressure quick opening device to the atmosphere, the air mass flow model of the control chamber of the ultra-high pressure quick opening device, the air mass flow model from the inlet chamber of the ultra-high pressure quick opening device to its outlet chamber, and the air mass flow model from the outlet chamber of the ultra-high pressure quick opening device to the atmosphere.

[0069] Correspondingly, based on the content of the above embodiments, as an optional embodiment, the second airflow density model of each cavity includes the airflow density model of the back pressure cavity, the airflow density model of the control cavity, the airflow density model of the inlet cavity, and the airflow density model of the outlet cavity of the ultra-high pressure quick opening device.

[0070] Specifically, in the embodiments of the present application, Figure 3 As shown in the schematic diagram of the structure inside the ultra-high pressure quick opening device 5, its various chambers include a back pressure chamber 53, a control chamber 52, an inlet chamber 51, and an outlet chamber 54. At the same time, the ultra-high pressure quick opening device 5 specifically also includes a spring 55 and a valve core 56. One end of the spring 55 is fixed to the top of the device, and the other end is connected to the valve core. When the device is opened, under the action of the ultra-high pressure airflow input from the inlet chamber 51, the force exerted on the control chamber 52 and the valve core 56 overcomes the thrust of the spring 55 on the valve core 56, the pressure in the back pressure chamber 53, and the friction force exerted on the valve core 56 during movement, causing the valve core 56 to shift and thus quickly open.

[0071] To ensure the rapid opening of the ultra-high pressure quick opening device (5ms), the force acting on the outlet chamber and control chamber of the ultra-high pressure quick opening device during the opening process should be much greater than the force acting on the back pressure chamber, that is, it is necessary to ensure that there is sufficient and stable ultra-high pressure air (350MPa) in the inlet chamber; the liquid-gas booster cylinder should have sufficient volume to provide sufficient ultra-high pressure air for the ultra-high pressure quick opening device during the opening process to realize the ultra-high pressure quick opening test.

[0072] like Figure 5 、 Figure 6 and Figure 7 As shown, the initial state of the ultra-high pressure quick opening device opening test, the opening process of the device opening test and the fully open state of the device opening test are respectively shown.

[0073] Furthermore, according to the model equation (1), the corresponding air mass flow model from the back pressure chamber of the ultra-high pressure quick opening device to the atmosphere can be expressed as: ; (6) At the same time, the airflow density model of the back pressure chamber of the ultra-high pressure quick opening device can be expressed as: ; (7) in, The mass flow rate from the back pressure chamber of the ultra-high pressure quick opening device to the atmosphere; is the flow coefficient; It is the equivalent flow area from the outlet cavity of the liquid-gas booster cylinder to the inlet cavity of the ultra-high pressure quick opening device; The back pressure chamber pressure of the ultra-high pressure quick opening device; is the atmospheric pressure; R is the air constant; is the adiabatic index of the air in the back pressure chamber of the quick opening device; The back pressure chamber temperature of the quick opening device; is the compression factor of the air in the back pressure chamber of the quick opening device; is the critical pressure ratio of air; The density of the back pressure cavity of the quick opening device; The density before the back pressure chamber of the quick opening device opens; The volume of the back pressure chamber of the quick opening device before opening; is the force area of ​​the back pressure chamber of the quick opening device during the opening process, It is the displacement of the valve core in the ultra-high pressure quick opening device.

[0074] Similarly, the air mass flow model of the control chamber of the ultra-high pressure quick opening device can be expressed as: ; (8) The airflow density model of the control cavity of the ultra-high pressure quick opening device can be expressed as: ; (9) in, Controls the mass flow rate of the cavity for the ultra-high pressure quick opening device; is the flow coefficient; It is the equivalent flow area of ​​the control cavity of the ultra-high pressure quick opening device; The inlet chamber pressure of the ultra-high pressure quick opening device; is the pressure in the control chamber of the ultra-high pressure quick opening device; R is the air constant; is the adiabatic index of the air in the inlet chamber of the ultra-high pressure quick opening device; is the inlet cavity temperature of the ultra-high pressure quick opening device; is the compression factor of the air in the inlet chamber of the ultra-high pressure quick opening device; is the critical pressure ratio of air; Control the airflow density in the cavity of the ultra-high pressure quick opening device; It is the airflow density before the ultra-high pressure quick opening device controls the cavity to open; The initial volume of the control chamber of the ultra-high pressure quick opening device is It is the force area of ​​the opening process of the control cavity of the ultra-high pressure quick opening device. Displacement of a valve core in an ultrahigh-pressure quick-opening device.

[0075] Similarly, the air mass flow model of the ultrahigh-pressure quick-opening device from the inlet chamber to the outlet chamber can be expressed as: ; (10) The air flow density model of the inlet chamber of the ultrahigh-pressure quick-opening device can be expressed as: ; (11) wherein, is the mass flow of the ultrahigh-pressure quick-opening device from the inlet chamber to the outlet chamber; is the flow coefficient; is the equivalent flow area of the ultrahigh-pressure quick-opening device from the inlet chamber to the outlet chamber; is the pressure of the inlet chamber of the ultrahigh-pressure quick-opening device; is the pressure of the outlet chamber of the ultrahigh-pressure quick-opening device; R is the air constant; is the adiabatic index of the air in the inlet chamber of the ultrahigh-pressure quick-opening device; is the temperature of the inlet chamber of the ultrahigh-pressure quick-opening device; is the compression factor of the air in the inlet chamber of the ultrahigh-pressure quick-opening device; is the critical pressure ratio of the air; is the density of the inlet chamber of the ultrahigh-pressure quick-opening device; is the density before opening of the inlet chamber of the ultrahigh-pressure quick-opening device; is the volume of the inlet chamber of the ultrahigh-pressure quick-opening device.

[0076] Similarly, the air mass flow model of the ultrahigh-pressure quick-opening device from the outlet chamber to the atmosphere can be expressed as: ; (12) The air flow density model of the outlet chamber of the ultrahigh-pressure quick-opening device can be expressed as: ; (13) wherein, is the mass flow of the ultrahigh-pressure quick-opening device from the outlet chamber to the atmosphere; is the flow coefficient; is the equivalent flow area of the ultrahigh-pressure quick-opening device from the outlet chamber to the atmosphere; is the pressure of the outlet chamber of the ultrahigh-pressure quick-opening device; is the atmospheric pressure; R is the air constant; is the adiabatic index of the air in the outlet chamber of the ultrahigh-pressure quick-opening device; is the temperature of the outlet chamber of the ultrahigh-pressure quick-opening device; is the compression factor of the air in the outlet chamber of the ultrahigh-pressure quick-opening device; is the critical pressure ratio of the air; is the density of the outlet cavity of the ultra-high pressure quick opening device; The density of the outlet cavity of the ultra-high pressure quick opening device before opening; is the initial volume of the outlet cavity of the ultra-high pressure quick opening device; It is the force area of ​​the valve core of the ultra-high pressure quick opening device during the opening process; It is the valve core displacement of the ultra-high pressure quick opening device.

[0077] Furthermore, in step S3, a dynamic model of the valve core of the ultra-high pressure quick opening device is determined based on the displacement of the valve core of the ultra-high pressure quick opening device and the friction force it is subjected to, the pressure of each cavity and the force area of ​​each cavity during the opening process.

[0078] Based on the content of the above embodiment, as an optional embodiment, the dynamic model of the valve core of the ultra-high pressure quick opening device is determined according to the following equation: ; (14) Where, is the quality of the valve core, To control the pressure of the chamber; To control the force area during the opening process of the cavity; is the pressure of the outlet chamber of the ultra-high pressure quick opening device; It is the force area of ​​the valve core during opening process; is the pressure of the back pressure chamber; It is the force area of ​​the back pressure chamber during the opening process; is the stiffness of the spring in the ultra-high pressure quick opening device; is the displacement of the valve core; is the second-order derivative of the valve core displacement with respect to time; is the initial compression of the spring in the ultra-high pressure quick opening device; The friction force on the valve core.

[0079] Furthermore, in an embodiment of the present application, in step S4, a simulation model of the ultra-high pressure quick opening test system can be built in MATLAB / Simulink, and the air mass of the second pressure level airflow filled into the gas-liquid mixed pressure conversion device, i.e., the aforementioned equation (4), and the air mass flow required by the ultra-high pressure quick opening device during the opening process, i.e., the aforementioned equation (5), are used to jointly solve the first air mass flow model, the first air flow density model, each second air mass flow model, and each second air flow density model. That is, by combining the aforementioned model equations (1) to (14), the change results of the quick opening parameters of the ultra-high pressure quick opening device can be analyzed, wherein the quick opening parameters may include the opening time and the pressure of each chamber in the device, etc.

[0080] The high-pressure quick-opening test method of the embodiment of the present application realizes the quick-opening test of the quick-opening device under ultra-high pressure by utilizing the ultra-high pressure quick-opening test system, and simulates and predicts the change results of the quick-opening parameters of the ultra-high pressure quick-opening device, thereby effectively verifying that the ultra-high pressure quick-opening device can meet the index requirements of ultra-high pressure resistance (350MPa) and fast opening (5ms).

[0081] In a specific embodiment of the present application, the ultra-high pressure quick opening test method includes: Step S10, determining the mass of air initially charged into the liquid-gas boost cylinder.

[0082] Specifically, the opening process of the ultra-high pressure quick opening device is extremely fast and can be regarded as an adiabatic process. In this embodiment, the temperature is 300K. The maximum working pressure of the ultra-high pressure quick opening device is 350MPa. The density of the air filled in the liquid-gas booster cylinder when it is pressurized to 350MPa is 903 In order to prevent the opening time and large flow requirements from not being met, the volume of the air filled into the liquid-gas booster cylinder is increased to 350MPa. Set to the inlet volume before the ultra-high pressure quick opening device opens , the expansion value of the outlet volume of the ultra-high pressure quick opening device during the opening process and outlet cavity The sum of the inlet volume before the ultra-high pressure quick opening device is opened 1608644 , when the ultra-high pressure quick opening device is opened, the valve core diameter is 140mm and the stroke is 30mm, then the outlet volume expansion value is 461580 .

[0083] The current gas source pressure on the market is less than 50MPa. In this embodiment, the initial air pressure filled into the liquid-gas booster cylinder is 30MPa, corresponding to a density of 314 ;The volume of air initially charged into the liquid-gas booster cylinder The inlet volume before the ultra-high pressure quick opening device is opened Volume of liquid-gas booster cylinder Therefore, according to the model equation (4), the volume of the liquid-gas booster cylinder can be obtained as 4344898 .

[0084] Step S20: determining the air mass flow rate required by the ultra-high pressure quick opening device during the opening process.

[0085] Here, the maximum working pressure of the ultra-high pressure quick opening device is 350 MPa, and its opening time should reach 5 ms. Therefore, according to the model equation (5), the air mass flow rate required by the ultra-high pressure quick opening device during the opening process can be calculated: 0.092362 .

[0086] Step S30 , establishing an input air mass flow model for the inlet chamber of the ultra-high pressure quick opening device, and determining an equivalent flow area for the liquid-gas booster cylinder to charge the ultra-high pressure quick opening device.

[0087] Here, the input air mass flow rate of the inlet chamber of the ultra-high pressure quick opening device is Should be greater than or equal to the air mass flow required by the high-pressure quick-opening device during the opening process , to ensure the large flow requirement of the ultra-high pressure quick-opening device during the opening process.

[0088] The ratio of the inlet chamber pressure after the ultra-high pressure quick opening device is opened to the outlet pressure of the liquid-gas booster cylinder is less than the critical pressure ratio of air. Based on the input air mass flow rate of the inlet chamber of the ultra-high pressure quick opening device , the inlet chamber pressure before and after opening and other parameters, according to the model equation (2), the equivalent flow area of ​​the liquid-gas booster cylinder to the ultra-high pressure quick opening device can be obtained 147.1 .

[0089] Step S40: Build a dynamic calculation model of the UHPQ opening process during the inflation and opening process of the UHPQ opening device and perform simulations to determine the opening time and pressure parameters of the UHPQ opening device. A simulation model of the UHPQ opening test system is built in MATLAB / Simulink to calculate parameters such as the opening time of the UHPQ opening device and the pressure in each chamber.

[0090] During the opening process of the ultra-high pressure quick opening device, if Figure 8 As shown, Figure 8 Figure (a) is a schematic diagram of the pressure change in the control chamber (chamber b) within the ultra-high-pressure quick-opening device, (b) is a schematic diagram of the pressure change in its back-pressure chamber (chamber a), (c) is a schematic diagram of the pressure change in its outlet chamber, (d) is a schematic diagram of the pressure change in its inlet chamber (i.e., the inlet chamber), (e) is a schematic diagram of the pressure change in the outlet chamber of the liquid-gas booster cylinder, and (f) is a schematic diagram of the displacement change of the valve core within the ultra-high-pressure quick-opening device. As can be seen from the figure, the initial pressure in the inlet chamber of the ultra-high-pressure quick-opening device can reach 350MPa, the valve core begins to displace within 5ms, and the device opens. Therefore, the test system provided in this application can effectively complete the ultra-high pressure resistance (350MPa) and rapid opening (5ms) tests of the ultra-high-pressure quick-opening device.

[0091] The method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, which can be stored in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, mobile hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and storage medium can be located in an ASIC.

[0092] The above embodiments can be implemented in whole or in part using software, hardware, firmware, or any combination thereof. When implemented using software, they can be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions. When loaded and executed on a computer, the computer program instructions fully or partially produce the processes or functions described in the embodiments of this application. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted via the computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium can be magnetic media (e.g., floppy disk, hard disk, tape), optical media (e.g., DVD), or semiconductor media (e.g., solid-state drive (SSD)).

[0093] It will be understood that the various numerical numbers involved in the embodiments of the present application are merely distinctions for the convenience of description and are not intended to limit the scope of the embodiments of the present application.

[0094] It should be understood that the terms such as "include" and "may include" used in the present application represent the presence of disclosed functions, operations or constituent elements, and do not limit one or more additional functions, operations and constituent elements. In the present application, terms such as "include" and / or "have" can be interpreted as representing a specific characteristic, number, operation, constituent element, component or a combination thereof, but can not be interpreted as excluding the presence or addition of one or more other characteristics, numbers, operations, constituent elements, components or combinations thereof.

[0095] In the description of the embodiments of the present application, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, "connection" can be detachable connection, or can be non-detachable connection; can be direct connection, or can be indirect connection through intermediate medium. Among them, "fixed connection" refers to the relative positional relationship after connection is unchanged. "Rotary connection" refers to the relative rotation after connection. "Sliding connection" refers to the relative sliding after connection. The orientation language mentioned in the embodiments of the present application, such as "top", "bottom", "inner", "outer", "left", "right", etc., is only the direction of the drawing, therefore, the orientation language used is to better, more clearly illustrate and understand the embodiments of the present application, and is not indicative or implied that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the embodiments of the present application.

[0096] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An ultra-high pressure quick opening test system, characterized in that: include: Gas source, fixed value pressure reducing valve, stop valve, gas-liquid mixed pressure conversion device and ultra-high pressure quick opening device; The outlet end of the gas source is connected to the inlet end of the fixed-value pressure reducing valve and the inlet end of the stop valve respectively; the outlet end of the fixed-value pressure reducing valve is connected to the first inlet end of the gas-liquid mixed pressure conversion device; the outlet end of the stop valve is connected to the second inlet end of the gas-liquid mixed pressure conversion device; the outlet end of the gas-liquid mixed pressure conversion device is connected to the three inlet ends of the ultra-high pressure quick opening device in three ways; The gas source is used to provide two air flows, one of which is to output an air flow of a first pressure level through a fixed-value pressure reducing valve to provide a driving air flow for the gas-liquid mixed pressure conversion device; the other air flow is to output an air flow of a second pressure level through the stop valve to provide a compressed air flow for the gas-liquid mixed pressure conversion device; The gas-liquid mixed pressure conversion device is used to compress the internal liquid under the drive of the airflow of the first pressure level to generate hydraulic pressure of the target pressure level to compress the airflow of the second pressure level. The airflow of the target pressure level is generated and enters the ultra-high pressure quick-opening device in three ways, one way enters the inlet chamber of the ultra-high pressure quick-opening device, and the other two ways enter the control chamber and back pressure chamber of the ultra-high pressure quick-opening device respectively, so that the ultra-high pressure quick-opening device performs an ultra-high pressure quick-opening test under the airflow of the target pressure level; The first pressure level is lower than the second pressure level, and the second pressure level is lower than the target pressure level.

2. The ultra-high pressure quick opening test system according to claim 1, characterized in that: The gas-liquid mixed pressure conversion device includes a water tank, a gas-liquid booster pump, a liquid-gas booster cylinder, a pressure start valve and a fixed ratio pressure reducing valve; The first inlet end of the gas-liquid booster pump serves as the first inlet end of the gas-liquid mixed pressure conversion device, the first inlet end of the liquid-gas booster cylinder serves as the second inlet end of the gas-liquid mixed pressure conversion device, and the outlet end of the liquid-gas booster cylinder serves as the outlet end of the gas-liquid mixed pressure conversion device; The outlet end of the water tank is connected to the second inlet end of the gas-liquid booster pump, and the outlet end of the gas-liquid booster pump is connected to the second inlet end of the liquid-gas booster cylinder; the inlet end of the ultra-high pressure quick opening device includes a first inlet end, a second inlet end and a third inlet end, wherein the first inlet end is in communication with the inlet cavity, the second inlet end is in communication with the control cavity, and the third inlet end is in communication with the back pressure cavity; The outlet of the liquid-gas booster cylinder is divided into three paths, one of which is connected to the first inlet of the ultra-high pressure quick-opening device, and the other two paths are connected to the second inlet and the third inlet respectively through the pressure start valve and the constant ratio pressure reducing valve; The gas-liquid booster pump is used to compress the water input from the water tank under the drive of the airflow at the first pressure level to generate a water flow at the target pressure level; The liquid-gas booster cylinder is used to compress the airflow of the second pressure level under the hydraulic action generated by the water flow of the target pressure level, generating the airflow of the target pressure level, one path of which enters the inlet chamber of the ultra-high pressure quick-opening device, and the other two paths enter the control chamber and the back pressure chamber respectively through the pressure starting valve and the constant ratio pressure reducing valve.

3. The ultra-high pressure quick opening test system according to claim 2, characterized in that: The gas-liquid booster pump is a reciprocating gas-liquid booster pump, a diaphragm gas-liquid booster pump, or a plunger gas-liquid booster pump.

4. The ultra-high pressure quick opening test system according to any one of claims 2 or 3, characterized in that: Also includes: A pressure relief valve, a first ultra-high pressure sensor, a second ultra-high pressure sensor, and a third ultra-high pressure sensor; the back pressure chamber is connected to the external atmosphere through the pressure relief valve; The first ultra-high pressure sensor is provided on the gas path between the outlet end of the gas-liquid mixed pressure conversion device and the inlet chamber, and is used to monitor the pressure change of the gas flow output by the gas-liquid mixed pressure conversion device; The second ultra-high pressure sensor is provided on the air path between the outlet end of the pressure start valve and the control chamber, and is used to monitor the pressure change of the control chamber; The third ultra-high pressure sensor is arranged on the air path between the outlet end of the constant ratio pressure reducing valve and the back pressure chamber, and is used to monitor the pressure change of the back pressure chamber.

5. A test method for the ultra-high pressure quick opening test system according to any one of 1 to 4, characterized in that: include: Determine a first air mass flow model from the outlet of the gas-liquid mixed pressure conversion device to the inlet of the ultra-high pressure quick opening device and a first airflow density model at the outlet of the gas-liquid mixed pressure conversion device; Determine a second air mass flow model for each air path within the ultra-high pressure quick-opening device and a second air flow density model for each cavity; Determining a dynamic model of the valve core based on the displacement of the valve core of the ultra-high pressure quick-opening device and the friction force it experiences, the pressure of each cavity, and the force-bearing area of ​​each cavity during the opening process; Using the air mass of the second pressure level airflow filled into the gas-liquid mixed pressure conversion device and the air mass flow required by the ultra-high pressure quick-opening device during the opening process, the first air mass flow model, the first air flow density model, each of the second air mass flow models, each of the second air flow density models and the dynamic model of the valve core are jointly solved to determine the change results of the quick-opening parameters of the ultra-high pressure quick-opening device.

6. The test method according to claim 5, characterized in that The gas-liquid mixed pressure conversion device includes a liquid-gas booster cylinder; the first air mass flow model for determining the outlet of the gas-liquid mixed pressure conversion device to the inlet of the ultra-high pressure quick opening device and the first airflow density model at the outlet of the gas-liquid mixed pressure conversion device include: A first air mass flow model from the outlet of the liquid-gas boosting cylinder to the inlet of the ultra-high pressure quick opening device and a first air flow density model from the outlet of the liquid-gas boosting cylinder are determined.

7. The test method according to claim 5, characterized in that The various cavities inside the ultra-high pressure quick opening device include a back pressure cavity, a control cavity, an inlet cavity and an outlet cavity; The second air mass flow model of each air path includes an air mass flow model from the back pressure chamber of the ultra-high pressure quick opening device to the atmosphere, an air mass flow model of the control chamber of the ultra-high pressure quick opening device, an air mass flow model from the inlet chamber of the ultra-high pressure quick opening device to its outlet chamber, and an air mass flow model from the outlet chamber of the ultra-high pressure quick opening device to the atmosphere.

8. The test method according to claim 7, characterized in that The second airflow density model of each cavity includes the airflow density model of the back pressure cavity, the airflow density model of the control cavity, the airflow density model of the inlet cavity and the airflow density model of the outlet cavity of the ultra-high pressure quick opening device.

9. The test method according to claim 7, characterized in that The dynamic model of the valve core of the ultra-high pressure quick opening device is determined according to the following equation: ； Where, is the mass of the valve core, is the pressure of the control chamber; is the force-bearing area of ​​the control chamber during the opening process; is the pressure of the outlet chamber of the ultra-high pressure quick opening device; is the force area of ​​the valve core during the opening process; is the pressure of the back pressure chamber; is the force-bearing area of ​​the back pressure chamber during the opening process; is the stiffness of the spring in the ultra-high pressure quick opening device; is the displacement of the valve core; is the second-order derivative of the displacement of the valve core with respect to time; is the initial compression amount of the spring in the ultra-high pressure quick opening device; is the friction force on the valve core.

10. The test method according to any one of claims 5 to 9, characterized in that: The second air mass flow model of each gas path inside the ultra-high pressure quick opening device is determined according to the following equation: ； Where, is the air mass flow rate; is the flow coefficient; is the equivalent flow area of ​​the gas path; is the pressure at the gas inlet; is the pressure at the gas outlet; is the air constant; is the adiabatic index of the air at the gas path inlet; is the temperature of the gas path inlet; is the compressibility factor of the air at the gas path inlet; is the critical pressure ratio of air.

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