An inerted environment test chamber of non-pressure accumulator type

Abstract

The utility model provides a kind of tester of providing inert environment by non-pressure storage body system, comprising: air gas source switch (1), electrical pressure proportional valve (9), second pressure sensor (10), air separation membrane component (11), large flow servo valve (14), small flow servo valve (15), closed micro-positive pressure cabin (18), low-pressure one-way discharge port (21), high-pressure one-way discharge port (22), data acquisition processing unit.Air separation membrane component (11) utilizes its own permeability to different kinds of gas molecules to physically separate oxygen and nitrogen, high-concentration oxygen is directly discharged from the oxygen-rich gas outlet as exhaust gas, and high-concentration nitrogen is input into the closed micro-positive pressure cabin (18) as product gas, forming an inert environment.The utility model uses non-pressure storage body system, uses air as gas source, can continuously prepare low-oxygen concentration gas, provides inert environment, and solves the problem that existing test equipment cannot meet the inert detection of airborne fuel tank products.

Description

Technical Field

[0001] This utility model belongs to the field of aviation product testing technology and relates to a tester that provides an inert environment without a pressure storage system. Background Technology

[0002] It is crucial to conduct inertization testing on airborne fuel tank products before use.

[0003] Currently, there are no dedicated non-pressurized testing equipment available domestically or internationally for providing an inertization environment. As a result, airborne fuel tank products cannot undergo inertization testing and cannot meet the requirements for inertization testing of airborne fuel tank products. Utility Model Content

[0004] This invention provides a tester that provides an inert environment without a pressure storage system, enabling inert testing of airborne fuel tank products.

[0005] This utility model provides a test apparatus for providing an inert environment without a pressure storage system, comprising: an air source switch 1, an electrical pressure proportional valve 9, an air separation membrane module 11, a high-flow servo valve 14, a low-flow servo valve 15, a flow sensor 16, a sealed micro-positive pressure chamber 18, an oxygen concentration sensor inside the chamber 19, a fuel vapor concentration sensor inside the chamber 20, a low-pressure one-way discharge port 21, a high-pressure one-way discharge port 22, and a data acquisition and processing unit; wherein, Compressed air is introduced into the inlet of air source switch 1, and the outlet of air source switch 1 is connected to the inlet of electrical pressure proportional valve 9; The outlet of the electrical pressure proportional valve 9 is connected to the inlet of the air separation membrane module 11, and the outlet of the air separation membrane module 11 is connected to the inlet of the flow sensor 16. The outlet of flow sensor 16 is connected to the inlet of large flow servo valve 14 and the inlet of small flow servo valve 15, and the outlet of large flow servo valve 14 and the outlet of small flow servo valve 15 are connected to the air inlet of sealed micro positive pressure chamber 18. The sealed micro-positive pressure chamber 18 is equipped with an internal oxygen concentration sensor 19, an internal fuel vapor concentration sensor 20, a low-pressure one-way discharge port 21, and a high-pressure one-way discharge port 22. The electrical pressure proportional valve 9, the high-flow servo valve 14, the low-flow servo valve 15, the flow sensor 16, the cabin oxygen concentration sensor 19, and the cabin fuel vapor concentration sensor 20 are connected to the corresponding contacts of the data acquisition and processing unit via wires. The air separation membrane module 11 is used to physically separate oxygen and nitrogen in compressed air. High-concentration oxygen is discharged directly from the oxygen-rich outlet as waste gas, while high-concentration nitrogen is input into the closed micro-positive pressure chamber 18 as product gas to form an inert environment.

[0006] Optionally, the high-flow servo valve 14 is used to quickly establish the target oxygen concentration inside the closed micro-positive pressure chamber 18 at the beginning of the test, and the low-flow servo valve 15 is used to maintain the target oxygen concentration inside the closed micro-positive pressure chamber 18 during the test.

[0007] Optionally, test apparatuses that provide an inert environment without a pressure storage system also include: a first pressure sensor 7 and a safety valve 8; The outlet of the air source switch 1 is connected to the inlet of the electrical pressure proportional valve 9, the first pressure sensor 7, and the safety valve 8 via a four-way valve.

[0008] Optionally, the first pressure sensor 7 is connected to the corresponding contact of the data acquisition and processing unit via wires; The first pressure sensor 7 is used to detect the pressure P1 of the compressed air entering the electrical pressure proportional valve 9; Safety valve 8 is used to open and release pressure when the pressure P1 is greater than the preset pressure.

[0009] Optionally, the test apparatus that provides an inert environment without a pressure storage system also includes: a second pressure sensor 10; The outlet of the electrical pressure proportional valve 9 is connected to the inlet of the air separation membrane module 11 and the second pressure sensor 10 via a three-way valve.

[0010] Optionally, the second pressure sensor 10 is connected to the corresponding contact of the data acquisition and processing unit via a wire; The second pressure sensor 10 is used to detect the outlet pressure P2 of the electrical pressure proportional valve 9.

[0011] Optionally, test apparatuses that provide an inert environment without pressurization also include: a third pressure sensor 13 and an external oxygen concentration sensor 17; The outlet of flow sensor 16 is connected to the third pressure sensor 13, the external oxygen concentration sensor 17, the inlet of the large flow servo valve 14, and the inlet of the small flow servo valve 15 via a five-way valve.

[0012] Optionally, the third pressure sensor 13 and the external oxygen concentration sensor 17 are connected via wires and corresponding contacts of the data acquisition and processing unit; The third pressure sensor 13 is installed at the outlet of the air separation membrane module 11 to detect the outlet pressure P3 of the air separation membrane module 11. The external oxygen concentration sensor 17 is installed at the outlet of the flow sensor 16 to detect whether the oxygen concentration of the product gas meets the requirements.

[0013] Optionally, the low-pressure one-way discharge port 21 and the high-pressure one-way discharge port 22 are used to exhaust air when the pressure inside the sealed micro-positive pressure chamber 18 is higher than the set value.

[0014] This invention provides a test apparatus that provides an inert environment without a pressurized system. The air separation membrane module utilizes its ability to permeate different types of gas molecules to physically separate oxygen and nitrogen. High-concentration oxygen is discharged directly as waste gas from the oxygen-rich outlet, while high-concentration nitrogen is input as product gas into a sealed micro-positive pressure chamber, forming an inert environment and enabling inertization testing of airborne fuel tank products. This invention employs a non-pressurized system, using air as the gas source, and can continuously produce low-oxygen-concentration gas to provide the inert environment. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the test apparatus of this utility model that provides an inert environment without a pressure storage system; Explanation of reference numerals in the attached figures: 1. Air source switch; 7. Pressure sensor; 8. Safety valve; 9. Electrical pressure proportional valve; 10. Second pressure sensor; 11. Air separation membrane module; 13. Third pressure sensor; 14. High flow servo valve; 15. Low flow servo valve; 16. Flow sensor; 17. External oxygen concentration sensor; 18. Sealed micro-positive pressure chamber; 19. Internal oxygen concentration sensor; 20. Internal fuel vapor concentration sensor; 21. Low-pressure one-way discharge port; 22. High-pressure one-way discharge port. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] The features and illustrative embodiments of various aspects of this utility model will now be described in detail. In the following detailed description, numerous specific details are set forth in order to provide a comprehensive understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this utility model by illustrating examples of it. This utility model is by no means limited to any specific arrangements and methods set forth below, but covers any improvements, substitutions, and modifications to the structure, method, and apparatus without departing from the spirit of this utility model. In the accompanying drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring this utility model.

[0019] In the description of this utility model, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They should not be construed as limiting this utility model. In addition, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0021] It should be noted that, where there is no conflict, the embodiments of this utility model and the features therein can be combined with each other, and the various embodiments can be referenced and cited in turn. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0023] See Figure 1This utility model provides a test apparatus that provides an inert environment without a pressure storage system. The test apparatus includes: a main unit frame panel, an air source switch 1, a pressure sensor 7, a safety valve 8, an electrical pressure proportional valve 9, a second pressure sensor 10, an air separation membrane module 11, a third pressure sensor 13, a high-flow servo valve 14, a low-flow servo valve 15, a flow sensor 16, an external oxygen concentration sensor 17, a sealed micro-positive pressure chamber 18, an internal oxygen concentration sensor 19, an internal fuel vapor concentration sensor 20, a low-pressure one-way discharge port 21, a high-pressure one-way discharge port 22, and a data acquisition and processing unit.

[0024] Each component is mounted on the main frame panel of the device.

[0025] This utility model provides a test apparatus for providing an inert environment without a pressure storage system, comprising: an air source switch 1, an electrical pressure proportional valve 9, an air separation membrane module 11, a high-flow servo valve 14, a low-flow servo valve 15, a flow sensor 16, a sealed micro-positive pressure chamber 18, an oxygen concentration sensor inside the chamber 19, a fuel vapor concentration sensor inside the chamber 20, a low-pressure one-way discharge port 21, a high-pressure one-way discharge port 22, and a data acquisition and processing unit; wherein, Compressed air is introduced into the inlet of air source switch 1, and the outlet of air source switch 1 is connected to the inlet of electrical pressure proportional valve 9; The outlet of the electrical pressure proportional valve 9 is connected to the inlet of the air separation membrane module 11, and the outlet of the air separation membrane module 11 is connected to the inlet of the flow sensor 16. The outlet of flow sensor 16 is connected to the inlet of large flow servo valve 14 and the inlet of small flow servo valve 15, and the outlet of large flow servo valve 14 and the outlet of small flow servo valve 15 are connected to the air inlet of sealed micro positive pressure chamber 18. The sealed micro-positive pressure chamber 18 is equipped with an internal oxygen concentration sensor 19, an internal fuel vapor concentration sensor 20, a low-pressure one-way discharge port 21, and a high-pressure one-way discharge port 22. The electrical pressure proportional valve 9, the high-flow servo valve 14, the low-flow servo valve 15, the flow sensor 16, the cabin oxygen concentration sensor 19, and the cabin fuel vapor concentration sensor 20 are connected to the corresponding contacts of the data acquisition and processing unit via wires. The air separation membrane module 11 is used to physically separate oxygen and nitrogen in compressed air. High-concentration oxygen is discharged directly from the oxygen-rich outlet as waste gas, while high-concentration nitrogen is input into the closed micro-positive pressure chamber 18 as product gas to form an inert environment.

[0026] Optionally, the high-flow servo valve 14 is used to quickly establish the target oxygen concentration inside the closed micro-positive pressure chamber 18 at the beginning of the test, and the low-flow servo valve 15 is used to maintain the target oxygen concentration inside the closed micro-positive pressure chamber 18 during the test.

[0027] Optionally, test apparatuses that provide an inert environment without a pressure storage system also include: a first pressure sensor 7 and a safety valve 8; The outlet of the air source switch 1 is connected to the inlet of the electrical pressure proportional valve 9, the first pressure sensor 7, and the safety valve 8 via a four-way valve.

[0028] Optionally, the first pressure sensor 7 is connected to the corresponding contact of the data acquisition and processing unit via wires; The first pressure sensor 7 is used to detect the pressure P1 of the compressed air entering the electrical pressure proportional valve 9; Safety valve 8 is used to open and release pressure when the pressure P1 is greater than the preset pressure.

[0029] Optionally, the test apparatus that provides an inert environment without a pressure storage system also includes: a second pressure sensor 10; The outlet of the electrical pressure proportional valve 9 is connected to the inlet of the air separation membrane module 11 and the second pressure sensor 10 via a three-way valve.

[0030] Optionally, the second pressure sensor 10 is connected to the corresponding contact of the data acquisition and processing unit via a wire; The second pressure sensor 10 is used to detect the outlet pressure P2 of the electrical pressure proportional valve 9.

[0031] Optionally, test apparatuses that provide an inert environment without pressurization also include: a third pressure sensor 13 and an external oxygen concentration sensor 17; The outlet of flow sensor 16 is connected to the third pressure sensor 13, the external oxygen concentration sensor 17, the inlet of the large flow servo valve 14, and the inlet of the small flow servo valve 15 via a five-way valve.

[0032] Optionally, the third pressure sensor 13 and the external oxygen concentration sensor 17 are connected via wires and corresponding contacts of the data acquisition and processing unit; The third pressure sensor 13 is installed at the outlet of the air separation membrane module 11 to detect the outlet pressure P3 of the air separation membrane module 11. The external oxygen concentration sensor 17 is installed at the outlet of the flow sensor 16 to detect whether the oxygen concentration of the product gas meets the requirements.

[0033] Optionally, the low-pressure one-way discharge port 21 and the high-pressure one-way discharge port 22 are used to exhaust air when the pressure inside the sealed micro-positive pressure chamber 18 is higher than the set value.

[0034] For example, compressed air is introduced into the inlet of air source switch 1. The outlet of air source switch 1 is connected to the inlet of electric pressure proportional valve 9, pressure sensor 7, and safety valve 8 via a four-way valve. The outlet of electric pressure proportional valve 9 is connected to the inlet of air separation membrane module 11 and second pressure sensor 10 via a three-way valve. The outlet of air separation membrane module 11 is connected to the inlet of flow sensor 16. The outlet of flow sensor 16 is connected to the third pressure sensor 13, external oxygen concentration sensor 17, inlet of large flow servo valve 14, and inlet of small flow servo valve 15 via a five-way valve. The outlet of large flow servo valve 14 and small flow servo valve 15 are connected to the inlet of air source switch 16. The outlet of the flow servo valve 15 is connected to the air inlet of the sealed micro-positive pressure chamber 18. The sealed micro-positive pressure chamber 18 is equipped with an in-chamber oxygen concentration sensor 19, an in-chamber fuel vapor concentration sensor 20, a low-pressure one-way discharge port 21, a high-pressure one-way discharge port 22, a pressure sensor 7, an electrical pressure proportional valve 9, a second pressure sensor 10, a third pressure sensor 13, a high-flow servo valve 14, a low-flow servo valve 15, a flow sensor 16, an external oxygen concentration sensor 17, an in-chamber oxygen concentration sensor 19, and an in-chamber fuel vapor concentration sensor 20, which are connected to the corresponding contacts of the data acquisition and processing unit via wires.

[0035] The working principle of this utility model is as follows: when preparing an inert environment, clean compressed air that has been dewatered, deoiled, and departicle-free is introduced into the inlet of the air source switch 1 of the tester through a pipeline.

[0036] When the air supply switch 1 is turned on, compressed air enters the inlet of the electrical pressure proportional valve 9. The pressure value P1 at this inlet is detected by the pressure sensor 7. When P1 is higher than the set value, it is discharged by the safety valve 8.

[0037] The electrical pressure proportional valve 9 sets its outlet pressure P2 according to the test requirements. P2 is detected by the second pressure sensor 10 and acts on the inlet of the air separation membrane module 11.

[0038] The function of the air separation membrane module 11 is to physically separate oxygen and nitrogen by utilizing its ability to permeate different types of gas molecules. High-concentration oxygen is discharged directly from the oxygen-enriched outlet as waste gas, while high-concentration nitrogen is input as product gas through the flow sensor 16 to the inlet of the high-flow servo valve 14 and the low-flow servo valve 15. The third pressure sensor 13 is set at the outlet of the air separation membrane module 11 to detect the outlet pressure P3 of the air separation membrane module 11. The external oxygen concentration sensor 17 is set at the outlet of the flow sensor 16 to detect whether the oxygen concentration of the product gas meets the requirements. The product gas is input into the sealed micro-positive pressure chamber 18 through the high-flow servo valve 14 and the low-flow servo valve 15. The high-flow servo valve 14 is used to quickly establish the target oxygen concentration in the chamber at the beginning of the test, while the low-flow servo valve 15 is used to maintain the target oxygen concentration in the chamber during the test. The sealed micro-positive pressure chamber 18 is equipped with an internal oxygen concentration sensor 19, an internal fuel vapor concentration sensor 20, a low-pressure one-way exhaust port 21, and a high-pressure one-way exhaust port 22. When the internal pressure is higher than the set value of the low-pressure one-way exhaust port 21 and the high-pressure one-way exhaust port 22, the low-pressure one-way exhaust port 21 and the high-pressure one-way exhaust port 22 exhaust gas. The data acquisition and processing unit collects the output signals of all sensors and sends control signals to the electrical pressure proportional valve 9, the high-flow servo valve 14, and the low-flow servo valve 15.

[0039] In one application example of this utility model, the main equipment frame panel, air source switch 1, pressure sensor 7, safety valve 8, electrical pressure proportional valve 9, second pressure sensor 10, air separation membrane module 11, third pressure sensor 13, high flow servo valve 14, low flow servo valve 15, flow sensor 16, external oxygen concentration sensor 17, sealed micro-positive pressure chamber 18, internal oxygen concentration sensor 19, internal fuel vapor concentration sensor 20, low pressure one-way discharge port 21, high pressure one-way discharge port 22, and data acquisition and processing unit are all finished products.

[0040] Equipment main frame panel: YDX01.000.00, manufactured by Hefei Jianghang Aircraft Equipment Co., Ltd.; Air supply switch 1: YS21.02.000.00, manufactured by Hefei Jianghang Aircraft Equipment Co., Ltd.; Pressure sensor 7: HM20 (0~1MPa), Nanjing Hongmu Technology Co., Ltd.; Safety valve 8: JHX1.14.000.00, manufactured by Hefei Jianghang Aircraft Equipment Co., Ltd. Electrical pressure proportional valve 9: ITV3050-3-4BS, SMC (China) Co., Ltd.; Second pressure sensor 10: HM20 (0~1MPa), Nanjing Hongmu Technology Co., Ltd.; Air separation membrane module 11: Sepuran N2 Sys (150*1310), Evonik Specialty Chemicals (Shanghai) Co., Ltd.; Third pressure sensor 13: HM20 (0~1MPa), Nanjing Hongmu Technology Co., Ltd.; High-flow servo valve 14: PM-05, Anhui Lichi Industrial Equipment Co., Ltd.; Small flow servo valve 15: PM-02, Anhui Lichi Industrial Equipment Co., Ltd.; Flow sensor 16: PFMB7501-04-D-MRA, SMC (China) Co., Ltd.; External oxygen concentration sensor 17: O2S-FR-T2-18C, SST Sensors Ltd., UK; Sealed Micro Positive Pressure Chamber 18: ODA-1500L Type Sealed Cavity (Custom Made), Beijing Oudeao Technology Development Co., Ltd.; In-cabin oxygen concentration sensor 19: O2S-FR-T2-18C, SST Sensors Ltd., UK; In-cabin fuel vapor concentration sensor 20: OIL-MODULE-1, Anhui Xinhe Defense Equipment Technology Co., Ltd.; Low-pressure unidirectional discharge port 21: JHX1.14.000.00, manufactured by Hefei Jianghang Aircraft Equipment Co., Ltd.; High-pressure unidirectional discharge port 22: JHX1.14.000.00G, manufactured by Hefei Jianghang Aircraft Equipment Co., Ltd.

[0041] The above detailed embodiments are a description of the present utility model. It should not be considered that the specific embodiments of the present utility model are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present utility model, and all of these should be considered to fall within the protection scope of the present utility model.

Claims

1. A test apparatus that provides an inert environment without a pressure storage system, characterized in that, include: Air source switch (1), electrical pressure proportional valve (9), air separation membrane module (11), high flow servo valve (14), low flow servo valve (15), flow sensor (16), sealed micro-positive pressure chamber (18), chamber oxygen concentration sensor (19), chamber fuel vapor concentration sensor (20), low pressure one-way discharge port (21), high pressure one-way discharge port (22), data acquisition and processing unit; among which, Compressed air is introduced into the inlet of the air source switch (1), and the outlet of the air source switch (1) is connected to the inlet of the electrical pressure proportional valve (9); The outlet of the electrical pressure proportional valve (9) is connected to the inlet of the air separation membrane module (11), and the outlet of the air separation membrane module (11) is connected to the inlet of the flow sensor (16). The outlet of the flow sensor (16) is connected to the inlet of the large flow servo valve (14) and the inlet of the small flow servo valve (15), and the outlet of the large flow servo valve (14) and the outlet of the small flow servo valve (15) are connected to the air inlet of the sealed micro positive pressure chamber (18). The sealed micro-positive pressure chamber (18) is equipped with an internal oxygen concentration sensor (19), an internal fuel vapor concentration sensor (20), a low-pressure one-way discharge port (21), and a high-pressure one-way discharge port (22). The electrical pressure proportional valve (9), the high-flow servo valve (14), the low-flow servo valve (15), the flow sensor (16), the cabin oxygen concentration sensor (19), and the cabin fuel vapor concentration sensor (20) are connected to the corresponding contacts of the data acquisition and processing unit via wires. The air separation membrane module (11) is used to physically separate oxygen and nitrogen in compressed air. High-concentration oxygen is discharged directly from the oxygen-rich outlet as waste gas, and high-concentration nitrogen is input into the closed micro-positive pressure chamber (18) as product gas to form an inert environment.

2. The test apparatus for providing an inert environment without a pressure storage system according to claim 1, characterized in that, The high-flow servo valve (14) is used to quickly establish the target oxygen concentration inside the closed micro-positive pressure chamber (18) during the initial stage of the test, while the low-flow servo valve (15) is used to maintain the target oxygen concentration inside the closed micro-positive pressure chamber (18) during the test.

3. The test apparatus for providing an inert environment without a pressure storage system according to claim 1, characterized in that, Also includes: First pressure sensor (7), safety valve (8); The outlet of the air source switch (1) is connected to the inlet of the electrical pressure proportional valve (9), the first pressure sensor (7), and the safety valve (8) via a four-way valve.

4. The test apparatus for providing an inert environment without a pressure storage system according to claim 3, characterized in that, The first pressure sensor (7) is connected to the corresponding contact of the data acquisition and processing unit via wires; The first pressure sensor (7) is used to detect the pressure P1 of the compressed air entering the electrical pressure proportional valve (9); The safety valve (8) is used to open and release pressure when the pressure P1 is greater than the preset pressure.

5. The test apparatus for providing an inert environment without a pressure storage system according to claim 1, characterized in that, Also includes: Second pressure sensor (10); The outlet of the electrical pressure proportional valve (9) is connected to the inlet of the air separation membrane module (11) and the second pressure sensor (10) via a three-way valve.

6. The test apparatus for providing an inert environment without a pressure storage system according to claim 5, characterized in that, The second pressure sensor (10) is connected to the corresponding contact of the data acquisition and processing unit via wires; The second pressure sensor (10) is used to detect the outlet pressure P2 of the electrical pressure proportional valve (9).

7. The test apparatus for providing an inert environment without a pressure storage system according to claim 1, characterized in that, Also includes: The third pressure sensor (13) and the extra-cabin oxygen concentration sensor (17); The outlet of the flow sensor (16) is connected to the third pressure sensor (13), the external oxygen concentration sensor (17), the inlet of the large flow servo valve (14), and the inlet of the small flow servo valve (15) via a five-way valve.

8. The test apparatus for providing an inert environment without a pressure storage system according to claim 7, characterized in that, The third pressure sensor (13) and the external oxygen concentration sensor (17) are connected by wires and corresponding contacts of the data acquisition and processing unit; The third pressure sensor (13) is installed at the outlet of the air separation membrane module (11) to detect the outlet pressure P3 of the air separation membrane module (11). The external oxygen concentration sensor (17) is installed at the outlet of the flow sensor (16) to detect whether the oxygen concentration of the product gas meets the requirements.

9. The test apparatus for providing an inert environment without a pressure storage system according to claim 1, characterized in that, The low-pressure one-way discharge port (21) and the high-pressure one-way discharge port (22) are used to exhaust gas when the pressure inside the sealed micro-positive pressure chamber (18) is higher than the set value.

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