A portable respiratory valve test platform and method of testing

Abstract

The application discloses a portable breathing valve test platform and a test method, which comprise a shared test node for connecting a breathing valve to be tested; a take-off adjustment section group, comprising a positive pressure take-off adjustment section in communication with a positive pressure interface and a negative pressure take-off adjustment section in communication with a negative pressure interface; a leakage flow control section, which is a shared gas path section for positive pressure leakage tests and negative pressure leakage tests; and a switching valve group connected to the shared test node. The portable breathing valve test platform concentrates four types of tests, i.e., positive pressure take-off, negative pressure take-off, positive pressure leakage and negative pressure leakage, to the same connection position of the breathing valve to be tested through the shared test node. Thus, independent leakage control gas paths for the positive pressure leakage tests and the negative pressure leakage tests can be avoided, repeated gas path sections and corresponding isolation and switching valve parts are reduced, and the portable breathing valve test platform is more concentrated.

Description

Technical Field

[0001] This invention relates to the technical field of breathing valve testing equipment, and more particularly to a portable breathing valve testing platform and testing method. Background Technology

[0002] Breather valves are commonly used for the breathing protection of storage tanks, containers, or pipeline systems. Their opening pressure, leakage performance, and other parameters directly affect the safety and sealing reliability of the equipment. To evaluate the performance of a breather valve, it is usually necessary to perform positive pressure opening pressure tests, negative pressure opening pressure tests, positive pressure leakage tests, and negative pressure leakage tests.

[0003] However, existing test benches often require multiple relatively independent test gas paths to meet different test requirements, such as positive pressure start-up, negative pressure start-up, positive pressure leakage, and negative pressure leakage. Switching between these paths is accomplished using numerous valves. Especially in positive and negative pressure leakage tests, existing solutions typically rely on pressure regulating components, flow detection components, and corresponding switching valves to form the test gas paths. This results in a complex overall gas path structure, a large number of pipe connections, a large number of valves, and significant challenges in assembly, debugging, and maintenance. Summary of the Invention

[0004] In view of the problems of complex air circuits and numerous valves in existing portable breathing valve testing platforms, this invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a portable breathing valve testing platform, which aims to reduce redundant test gas paths and reduce the impact of non-working paths on the current test paths while retaining the positive pressure start-up, negative pressure start-up, positive pressure leakage and negative pressure leakage testing functions.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a portable breathing valve testing platform, comprising a common test node for connecting the breathing valve under test; a positive pressure interface and a negative pressure interface for connecting to a positive pressure source and a negative pressure source, respectively; a start-up adjustment section group, including a positive pressure start-up adjustment section connected to the positive pressure interface and a negative pressure start-up adjustment section connected to the negative pressure interface; a leakage flow control section, wherein the leakage flow control section is a common air path section for positive pressure leakage testing and negative pressure leakage testing; and a switching valve group connected to the common test node, the positive pressure interface, the negative pressure interface, the start-up adjustment section group, and the leakage flow control section; the switching valve group is used to form only one test path at any given time.

[0007] As a preferred embodiment of the portable breathing valve testing platform of the present invention, the common testing node includes a connecting port, a pressure tapping port, a connecting pipeline, and a pressure tapping pipeline; the connecting port is connected to the product cavity of the breathing valve under test through the connecting pipeline to form a test airflow path for air intake or exhaust; one end of the pressure tapping pipeline is connected to the connecting pipeline near the breathing valve under test through a tee, and the other end is connected to the pressure tapping port, which is connected to a pressure detection element.

[0008] In a preferred embodiment of the portable breathing valve testing platform of the present invention, when the test type is a start-up test and the pressure type is positive pressure, the switching valve group connects the positive pressure interface, the positive pressure start-up adjustment section, and the common test node in sequence; when the test type is a start-up test and the pressure type is negative pressure, the switching valve group connects the common test node, the negative pressure start-up adjustment section, and the negative pressure interface in sequence.

[0009] In a preferred embodiment of the portable breathing valve testing platform of the present invention, when the test type is a leakage test and the pressure type is positive pressure, the switching valve group connects the positive pressure interface, the leakage flow control section and the common test node in sequence; when the test type is a leakage test and the pressure type is negative pressure, the switching valve group connects the common test node, the leakage flow control section and the negative pressure interface in sequence.

[0010] As a preferred embodiment of the portable breathing valve testing platform of the present invention, the leakage flow control section includes at least two flow control sub-sections arranged in parallel, each of the flow control sub-sections is provided with a flow controller with a different range, and the switching valve group is used to connect the selected flow control sub-section to the test path and cut off the unselected flow control sub-section.

[0011] As a preferred embodiment of the portable breathing valve testing platform of the present invention, at least two of the flow control sub-segments include a small-range flow control sub-segment and a large-range flow control sub-segment. The small-range flow control sub-segment is used for small leakage testing, and the large-range flow control sub-segment is used for large leakage testing or initial pressure build-up of the test path.

[0012] In a preferred embodiment of the portable breathing valve testing platform of the present invention, the pressure detection component includes a first pressure sensor and a second pressure sensor, the range of the first pressure sensor is greater than the range of the second pressure sensor, the first pressure sensor is connected to the pressure tapping port, and the second pressure sensor is selectively connected to the pressure tapping port through a protection valve.

[0013] In a preferred embodiment of the portable breathing valve testing platform of the present invention, the protective valve connects the second pressure sensor and the pressure tap when the pressure at the pressure tap is within the allowable range of the second pressure sensor, and disconnects the second pressure sensor and the pressure tap when the pressure at the pressure tap exceeds the allowable range of the second pressure sensor.

[0014] As a preferred embodiment of the portable breathing valve testing platform of the present invention, it further includes an exhaust port, and the switching valve group is also used to form a pressure relief path. In the pressure relief path, the common test node is connected to the exhaust port, and the positive pressure port, the negative pressure port, the positive pressure start-up adjustment section, the negative pressure start-up adjustment section and the leakage flow control section are all disconnected from the common test node.

[0015] As a preferred embodiment of the portable breathing valve testing platform of the present invention, the switching valve group includes multiple pneumatic control valves, and the positive pressure interface is also connected to the drive end of each of the pneumatic control valves through a pilot air supply passage, so that the positive pressure source connected to the positive pressure interface provides a driving air source for each of the pneumatic control valves.

[0016] Another object of the present invention is to provide a breathing valve testing method applicable to the above-mentioned portable breathing valve testing platform, including determining the current functional segment and the current pressure interface according to the test type and pressure type of the test item to be performed; Specifically, when the test type is a start-up test, the current functional segment is the start-up adjustment segment corresponding to the pressure type; when the test type is a leakage test, the current functional segment is the leakage flow control segment. When the pressure type is positive pressure, the current pressure interface is a positive pressure interface, and the switching valve group is controlled to form the current test path from the current pressure interface through the current functional segment to the common test node; When the pressure type is negative pressure, the current pressure interface is a negative pressure interface, and the switching valve group is controlled to form the current test path from the shared test node through the current functional segment to the current pressure interface; When forming the current test path, the control switching valve group cuts off the connection between the other pressure interface besides the current pressure interface and the other functional segments besides the current functional segment and the common test node.

[0017] In a preferred embodiment of the breathing valve testing method of the present invention, when the test type is a start-up test and the pressure type is positive pressure, the switching valve group is controlled to connect the positive pressure interface, the positive pressure start-up adjustment section, and the common test node in sequence, and the connection between the negative pressure interface, the negative pressure start-up adjustment section, the leakage flow control section, and the common test node is cut off; when the test type is a start-up test and the pressure type is negative pressure, the switching valve group is controlled to connect the common test node, the negative pressure start-up adjustment section, and the negative pressure interface in sequence, and the connection between the positive pressure interface, the positive pressure start-up adjustment section, the leakage flow control section, and the common test node is cut off.

[0018] In a preferred embodiment of the breathing valve testing method of the present invention, when the test type is a leakage test and the pressure type is positive pressure, the control switching valve group connects the positive pressure interface, the leakage flow control section, and the common test node in sequence, and disconnects the connection between the negative pressure interface and the start-up adjustment section group and the common test node; when the test type is a leakage test and the pressure type is negative pressure, the control switching valve group connects the common test node, the leakage flow control section, and the negative pressure interface in sequence, and disconnects the connection between the positive pressure interface and the start-up adjustment section group and the common test node.

[0019] As a preferred embodiment of the breathing valve testing method of the present invention, when switching from one test item to another test item, the switching valve group is first controlled to shut down the current test path, so that the common test node and the positive pressure interface, negative pressure interface, start-up adjustment section group and leakage flow control section are all in a shut-down isolation state, and then the target test path is formed according to the test type and pressure type of the target test item.

[0020] The beneficial effects of this invention are as follows: By sharing a test node, four types of tests—positive pressure start-up, negative pressure start-up, positive pressure leakage, and negative pressure leakage—are concentrated at the same connection point of the breather valve under test. Furthermore, by switching valve groups, the same leakage flow control section is selectively connected between the positive pressure interface and the shared test node, or between the shared test node and the negative pressure interface, allowing positive and negative pressure leakage tests to share the same leakage control air path. This avoids the need for separate leakage control air paths for positive and negative pressure leakage tests, reducing redundant air path segments and their corresponding isolation and switching valves. Through this arrangement, the internal layout of the portable breather valve testing platform is more centralized, and the reduction in various valves and pipelines significantly reduces the weight and volume of the equipment, making it easier to carry to the field for testing. The lighter weight of the device makes it more portable.

[0021] The leakage flow control section may include at least two flow control sub-sections connected in parallel with different ranges to adapt to different leakage ranges; the shared test node may include interconnected connection ports and pressure taps so that different test items can share the same product cavity pressure acquisition location.

[0022] By selecting flow control segments with different ranges to connect to the leakage test path, a larger flow control segment can be connected in the initial stage of leakage testing or under conditions of large leakage to meet the requirements of rapid pressure build-up and large flow testing; a smaller flow control segment can be connected under conditions of small leakage or pressure close to the target pressure to improve the precision of small flow regulation and leakage reading. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the portable breathing valve testing platform of the present invention.

[0025] Figure 2 This is a schematic diagram of the air path for the positive pressure start-up test circuit of the portable breathing valve test platform of the present invention.

[0026] Figure 3 This is a schematic diagram of the air path for the negative pressure start-up test circuit of the portable breathing valve test platform of the present invention.

[0027] Figure 4 This is a schematic diagram of the gas path for the positive pressure leakage test path of the portable breathing valve test platform of the present invention.

[0028] Figure 5 This is a schematic diagram of the air path for the negative pressure leakage test circuit of the portable breathing valve test platform of the present invention.

[0029] Figure 6 This is a complete schematic diagram of the portable breathing valve testing platform of the present invention.

[0030] Figure reference numerals: 100, Portable breathing valve test platform; 101, Shared test node; 101a, Connecting port; 101b, Pressure tap; 102, Positive pressure interface; 103, Negative pressure interface; 104, Start-up adjustment section group; 104a, Positive pressure start-up adjustment section; 104b, Negative pressure start-up adjustment section; 106, Leakage flow control section; 106a, Flow control sub-section; 106b, Flow controller; 107, Switching valve group; T1, Positive pressure start-up test path; T2, Negative pressure start-up test path; T3, Positive pressure leakage test... Test passage; T4, negative pressure leakage test passage; 107a, first pneumatic control valve; 107b, second pneumatic control valve; 107c, third pneumatic control valve; 107d, fourth pneumatic control valve; 107e, flow regulating valve; 107f, fifth pneumatic control valve; 107g, sixth pneumatic control valve; 108, pressure detection element; 108a, first pressure sensor; 108b, second pressure sensor; 108c, protection valve; 200, breather valve under test; 300, positive pressure source; 400, negative pressure source; 500, exhaust port; 501, pressure relief passage. Detailed Implementation

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0034] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0035] Example 1

[0036] Reference Figure 1According to the first embodiment of the present invention, a portable breathing valve testing platform 100 is provided. This device includes a common test node 101 for connecting the breathing valve 200 under test; a positive pressure interface 102 and a negative pressure interface 103 for connecting to a positive pressure source 300 and a negative pressure source 400, respectively; a start-up adjustment section group 104, including a positive pressure start-up adjustment section 104a connected to the positive pressure interface 102 and a negative pressure start-up adjustment section 104b connected to the negative pressure interface 103; a leakage flow control section 106, which is a common air path section for positive pressure leakage testing and negative pressure leakage testing; and a switching valve group 107 connected to the common test node 101, the positive pressure interface 102, the negative pressure interface 103, the start-up adjustment section group 104, and the leakage flow control section 106.

[0037] The switching valve group 107 is used to form only one test path at any given time. The test path is as follows: the common test node 101 is connected to the corresponding pressure interface's start-up test path through the start-up adjustment section in the start-up adjustment section group 104 corresponding to the positive pressure interface 102 or the negative pressure interface 103; or the common test node 101 is connected to the positive pressure interface 102 or the negative pressure interface 103's leakage test path through the leakage flow control section 106.

[0038] The shared test node 101 serves as a common node for the four types of test paths. It is connected to the product cavity of the breather valve 200 under test in different test states, so that the positive pressure start-up test, negative pressure start-up test, positive pressure leakage test, and negative pressure leakage test all act on the same test cavity. Therefore, it is not necessary to set up independent connection nodes for different test items, reducing the duplication of test interfaces and pressure tapping positions.

[0039] The start-up adjustment section group 104 is used to form a test gas path with adjustable gas flow during the start-up test. Specifically, the positive pressure start-up adjustment section 104a corresponds to the positive pressure port 102, and the negative pressure start-up adjustment section 104b corresponds to the negative pressure port 103. During the start-up test, the switching valve group 107 connects the common test node 101 to the corresponding pressure port via the corresponding start-up adjustment section, according to the selected pressure type, thereby causing the tested breathing valve 200 to generate a start-up response under the corresponding positive or negative pressure.

[0040] The leakage flow control section 106 is used to create a test gas path with controllable gas flow during leakage testing. This leakage flow control section 106 does not serve only a single pressure direction, but rather acts as a shared gas path for both positive and negative pressure leakage tests. During a positive pressure leakage test, the switching valve assembly 107 connects the leakage flow control section 106 between the positive pressure port 102 and the shared test node 101; during a negative pressure leakage test, the switching valve assembly 107 connects the leakage flow control section 106 between the shared test node 101 and the negative pressure port 103. Thus, the same leakage flow control section 106 can participate in both positive and negative pressure leakage tests, avoiding the need for separate leakage control gas paths for each type of leakage test.

[0041] The switching valve assembly 107 is used to switch the connected objects of the common test node 101 between different test items. Specifically, when forming a start-up test path, the switching valve assembly 107 connects the common test node 101 with the corresponding start-up regulating section in the start-up regulating section group 104, and disconnects the leakage flow control section 106 from the common test node 101; when forming a leakage test path, the switching valve assembly 107 connects the common test node 101 with the leakage flow control section 106, and disconnects the start-up regulating section group 104 from the common test node 101. Through the above switching method, only one test path is in a working connected state at any given time, while the other test paths are disconnected, thereby avoiding interference from non-current test paths to the pressure state of the common test node 101.

[0042] During use, when a positive pressure start-up test is required, the switching valve group 107 forms a positive pressure start-up test passage T1, so that the positive pressure interface 102, the positive pressure start-up adjustment section 104a and the common test node 101 are connected in sequence. The positive pressure source 300 acts on the tested breathing valve 200 through this test passage to obtain the positive pressure start-up pressure of the tested breathing valve 200.

[0043] When a negative pressure start-up test is required, the switching valve group 107 forms a negative pressure start-up test passage T2, which connects the common test node 101, the negative pressure start-up adjustment section 104b and the negative pressure interface 103 in sequence. The negative pressure source 400 acts on the tested breathing valve 200 through this test passage to obtain the negative pressure start-up pressure of the tested breathing valve 200.

[0044] When a positive pressure leakage test is required, the switching valve group 107 forms a positive pressure leakage test path T3, so that the positive pressure interface 102, the leakage flow control section 106 and the common test node 101 are connected in sequence. The positive pressure source 300 provides test gas to the product chamber where the breather valve 200 under test is located through the leakage flow control section 106, so as to carry out a positive pressure leakage test under a predetermined pressure condition.

[0045] When a negative pressure leakage test is required, the switching valve group 107 forms a negative pressure leakage test path T4, so that the common test node 101, the leakage flow control section 106 and the negative pressure interface 103 are connected in sequence. The negative pressure source 400 forms a negative pressure test condition for the product cavity where the breather valve 200 under test is located through the leakage flow control section 106, so as to carry out the negative pressure leakage test under the predetermined pressure condition.

[0046] With the above settings, the positive pressure start-up test and the negative pressure start-up test share the same common test node 101, and the positive pressure leakage test and the negative pressure leakage test share the same leakage flow control section 106, with the corresponding test paths selectively formed by the switching valve group 107. Compared to setting up independent test gas paths for different test items, this embodiment can reduce the setting of redundant gas path sections while retaining four types of test functions, making the gas path structure more centralized.

[0047] Example 2

[0048] Reference Figures 2-5 This is the second embodiment of the present invention, which differs from the first embodiment in that: the common test node 101 includes a connecting port 101a, a pressure tapping port 101b, a connecting pipe, and a pressure tapping pipe; the connecting port 101a is connected to the product cavity of the breather valve 200 under test through the connecting pipe, and is used to form a test airflow path for air intake or exhaust; one end of the pressure tapping pipe is connected to the connecting pipe near the breather valve 200 under test through a tee, and the other end is connected to the pressure tapping port 101b, which is connected to a pressure detection element 108.

[0049] The shared test node 101 is not just a single interface, but includes a connecting port 101a for the main test airflow and a pressure tapping port 101b for pressure acquisition. The connecting port 101a is connected to the product chamber of the breather valve 200 under test through a connecting pipe. During the positive pressure start-up test, negative pressure start-up test, positive pressure leakage test, and negative pressure leakage test, the test gas mainly enters or exits the product chamber of the breather valve 200 under test through the connecting port 101a.

[0050] The pressure tap 101b is connected to the connecting pipeline via a pressure tapping line. Specifically, a tee is provided in the connecting pipeline near the breather valve 200 under test. One end of the pressure tapping line is connected to this tee, and the other end is connected to the pressure tap 101b. The pressure detection element 108 detects the pressure on the product chamber side of the breather valve 200 under test through the pressure tap 101b. The pressure tapping line is mainly used to transmit pressure signals and is not primarily used as the main flow channel for the test gas.

[0051] Because gas flows in the connecting pipeline during air intake or exhaust, this gas flow generates flow resistance and pressure loss. If the pressure tapping point is located near the testing device, the pressure detected by the pressure sensor 108 may include errors caused by pressure drop along the connecting pipeline, and cannot accurately reflect the pressure near the product chamber of the tested breathing valve 200. In this embodiment, the pressure tapping pipeline is connected near the tested breathing valve 200 via a tee, so that the pressure collected by the pressure sensor 108 is closer to the actual pressure at the tested breathing valve 200.

[0052] Meanwhile, the pressure tap 101b is not directly located on the valve body of the tested breathing valve 200, but rather pressure is applied through a three-way valve near the tested breathing valve 200. Therefore, there is no need to create an additional pressure tap on the tested breathing valve 200, maintaining the versatility of the valve's structure and facilitating compatibility with breathing valves of different specifications or structures.

[0053] The pressure detection element 108 includes a first pressure sensor 108a and a second pressure sensor 108b. The range of the first pressure sensor 108a is greater than the range of the second pressure sensor 108b. The first pressure sensor 108a is connected to the pressure tap 101b, and the second pressure sensor 108b is selectively connected to the pressure tap 101b through a protection valve 108c.

[0054] The first pressure sensor 108a can be a large-range, high-precision direct pressure sensor, for example, with a range of -250 mbar to 1000 mbar; the second pressure sensor 108b can be a small-range, high-precision direct pressure sensor, for example, with a range of -100 mbar to 100 mbar. The first pressure sensor 108a is used to cover a wide range of positive and negative pressure tests, while the second pressure sensor 108b is used to perform more precise detection of the pressure in the product cavity under micro-pressure or low-pressure test conditions. Thus, the pressure sensing element 108 can simultaneously achieve wide range adaptability and detection accuracy under low-pressure conditions.

[0055] When the pressure at the pressure tap 101b is within the allowable range of the second pressure sensor 108b, the protective valve 108c connects the second pressure sensor 108b and the pressure tap 101b, and disconnects the second pressure sensor 108b and the pressure tap 101b when the pressure at the pressure tap 101b exceeds the allowable range of the second pressure sensor 108b.

[0056] Furthermore, during positive pressure start-up tests or high positive pressure leakage tests, since the pressure at the common test node 101 may exceed the allowable range of the second pressure sensor 108b, the protection valve 108c can remain closed, isolating the second pressure sensor 108b from the pressure tap 101b. During low-pressure positive leakage tests, low-pressure negative leakage tests, or low-pressure start-up tests, when the pressure at the common test node 101 is within the allowable range of the second pressure sensor 108b, the protection valve 108c can switch to the connected state, allowing the second pressure sensor 108b to participate in pressure detection. Thus, based on the same pressure tap 101b, through the cooperation of the first pressure sensor 108a, the second pressure sensor 108b, and the protection valve 108c, large-range detection, small-range high-precision detection, and small-range sensor protection can be achieved.

[0057] During use, before or during testing, the pressure at the pressure tap 101b can be detected by the first pressure sensor 108a. When the detected pressure is not within the allowable range of the second pressure sensor 108b, the protective valve 108c remains closed, and the second pressure sensor 108b does not directly bear the pressure at the pressure tap 101b. When the detected pressure enters the allowable range of the second pressure sensor 108b, the protective valve 108c opens, allowing the second pressure sensor 108b to connect to the pressure tap 101b. In the micro-pressure testing stage where higher pressure detection resolution is required, the detection result of the second pressure sensor 108b can be used preferentially; in the stage where the pressure variation range is large or the pressure is not yet stable, the detection result of the first pressure sensor 108a can be used. Through the above method, this embodiment can improve the pressure detection accuracy under low-pressure testing conditions without adding independent pressure tapping nodes, and reduce the risk of damage to small-range pressure sensors due to over-range pressure.

[0058] The remaining structure is the same as that in Example 1.

[0059] Example 3

[0060] Reference Figure 2 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that when the test type is a jump test and the pressure type is positive pressure, the switching valve group 107 connects the positive pressure port 102, the positive pressure jump adjustment section 104a and the common test node 101 in sequence.

[0061] Specifically, when the positive pressure start-up test path T1 is formed, the first pneumatic control valve 107a and the third pneumatic control valve 107c are in the closed state, the second pneumatic control valve 107b is in the open state, and all other pneumatic control valves are in the closed state. At this time, the positive pressure source 300 enters the positive pressure start-up adjustment section 104a through the positive pressure interface 102, and after passing through the flow regulating valve 107e set in the positive pressure start-up adjustment section 104a, it connects to the connection port 101a, thereby supplying positive pressure gas to the product chamber of the breather valve 200 under test. During the test, the gas flow rate entering the product chamber is changed by adjusting the flow regulating valve 107e, and the pressure change near the product chamber is detected through the pressure tap 101b. The pressure peak corresponding to when the breather valve is opened is taken as the positive pressure start-up pressure result.

[0062] In this pathway, the positive pressure source 300 provides positive pressure gas to the tested breathing valve 200, and the pressure at the pressure tap 101b is used to reflect the positive pressure start-up pressure of the tested breathing valve 200.

[0063] Reference Figure 3 When the test type is a start-up test and the pressure type is negative pressure, the switching valve group 107 connects the common test node 101, the negative pressure start-up adjustment section 104b and the negative pressure interface 103 in sequence.

[0064] Specifically, when the negative pressure start-up test path T2 is formed, the fourth pneumatic control valve 107d is in the open state, while the first pneumatic control valve 107a, the second pneumatic control valve 107b, the third pneumatic control valve 107c, the fifth pneumatic control valve 107f, and the sixth pneumatic control valve 107g are in the closed state. At this time, the product chamber of the tested breathing valve 200 is connected to the negative pressure start-up adjustment section 104b through the connecting port 101a and the fourth pneumatic control valve 107d, and then connected to the negative pressure interface 103 after passing through the flow regulating valve 107e set in the negative pressure start-up adjustment section 104b. The negative pressure source 400 creates a suction effect on the product chamber. During the test, the suction flow rate is changed by adjusting the flow regulating valve 107e, and the pressure change near the product chamber is detected through the pressure tap 101b. The negative pressure peak value corresponding to when the breathing valve is opened is taken as the negative pressure start-up pressure result.

[0065] In this pathway, the negative pressure source 400 creates a suction effect on the tested breathing valve 200, and the pressure at the pressure tap 101b is used to reflect the negative pressure start-up pressure of the tested breathing valve 200.

[0066] Reference Figure 4 When the test type is leakage test and the pressure type is positive pressure, the switching valve group 107 connects the positive pressure port 102, the leakage flow control section 106 and the common test node 101 in sequence.

[0067] Specifically, when forming the positive pressure leakage test path T3, the first pneumatic control valve 107a and the fifth pneumatic control valve 107f are in the conducting state, while the second pneumatic control valve 107b, the third pneumatic control valve 107c, the fourth pneumatic control valve 107d, and the sixth pneumatic control valve 107g are in the closed state. At this time, the positive pressure source 300 enters the leakage flow control section 106 through the positive pressure interface 102, and after passing through the selected flow control sub-section 106a and the corresponding flow controller 106b, it connects to the connection port 101a through the fifth pneumatic control valve 107f, thereby supplying test gas to the product chamber of the breather valve 200 under test. During the test, the gas supply flow rate is adjusted by the flow controller 106b, and the product chamber pressure is monitored by the pressure tap 101b. When the product chamber pressure stabilizes at the target test pressure, the current flow rate value of the flow controller 106b is taken as the positive pressure leakage test result.

[0068] In this pathway, the positive pressure source 300 supplies test gas to the product chamber of the breather valve 200 under test via the leakage flow control section 106, so that the product chamber is subjected to leakage testing under the target positive pressure condition.

[0069] Reference Figure 5 When the test type is leakage test and the pressure type is negative pressure, the switching valve group 107 connects the common test node 101, leakage flow control section 106 and negative pressure interface 103 in sequence.

[0070] Specifically, when the negative pressure leakage test path T4 is formed, the sixth pneumatic control valve 107g and the third pneumatic control valve 107c are in the conducting state, while the first pneumatic control valve 107a, the second pneumatic control valve 107b, the fourth pneumatic control valve 107d, and the fifth pneumatic control valve 107f are in the closed state. At this time, the product chamber of the tested breathing valve 200 is connected to the negative pressure interface 103 through the connecting port 101a and the leakage flow control section 106. The negative pressure source 400 forms a suction effect on the product chamber through the leakage flow control section 106. During the test, the suction flow rate is adjusted by the flow controller 106b, and the pressure in the product chamber is monitored by the pressure tap 101b. When the pressure in the product chamber stabilizes at the target negative pressure test pressure, the current flow rate value of the flow controller 106b is taken as the negative pressure leakage test result.

[0071] In this pathway, the negative pressure source 400 creates a negative pressure test condition for the product cavity of the breather valve 200 under test through the leakage flow control section 106, so that the product cavity is subjected to leakage test under the negative pressure target condition.

[0072] In the four test states described above, the protection valve 108c can selectively connect or disconnect the second pressure sensor 108b and the pressure tap 101b according to the method described in Embodiment 2. Its opening and closing does not change the basic formation of the four test paths. The pneumatic control valve corresponding to the exhaust port 500 remains closed in the four test states to prevent the shared test node 101 from being depressurized through the exhaust port 500 during the test.

[0073] Furthermore, the negative pressure source 400 may include a negative pressure generating element, which can be a vacuum generator or a pneumatic component with a Venturi negative pressure generating structure. The supply end of the negative pressure generating element is connected to the positive pressure source 300 or the positive pressure interface 102, and the negative pressure output end of the negative pressure generating element is connected to the negative pressure interface 103, so that the input positive pressure gas is generated by the negative pressure generating element to form a negative pressure for use in the negative pressure start-up test path T2 or the negative pressure leakage test path T4. Thus, the test platform can use the same positive pressure gas source to realize the generation of the negative pressure required for positive pressure testing, pneumatic valve actuation, and negative pressure testing, thereby reducing the configuration of independent negative pressure gas sources.

[0074] During operation, the operator or the test bench control system activates the switching valve group 107 to the corresponding state based on the test item to be performed. When performing a positive pressure start-up test, only the positive pressure start-up test path T1 is formed; when performing a negative pressure start-up test, only the negative pressure start-up test path T2 is formed; when performing a positive pressure leakage test, only the positive pressure leakage test path T3 is formed; and when performing a negative pressure leakage test, only the negative pressure leakage test path T4 is formed. When any test path is formed, all other test paths are blocked by the switching valve group 107, preventing unintended crosstalk between the positive pressure source 300, negative pressure source 400, start-up adjustment section group 104, leakage flow control section 106, and exhaust port 500. Therefore, the four types of tests can share the same common test node 101, and the positive pressure leakage test and the negative pressure leakage test can share the same leakage flow control section 106, thereby reducing the need for redundant gas path sections.

[0075] The remaining structure is the same as that in Example 2.

[0076] Example 4

[0077] Reference Figures 2-5 This is the fourth embodiment of the present invention. The difference between this embodiment and the above embodiments is that the leakage flow control section 106 includes at least two flow control sub-sections 106a arranged in parallel. Each flow control sub-section 106a is provided with a flow controller 106b with a different range. The switching valve group 107 is used to connect the selected flow control sub-section 106a to the test path and to cut off the unselected flow control sub-section 106a.

[0078] In this embodiment, the leakage flow control section 106 may include three flow control sub-sections 106a connected in parallel, each corresponding to a flow controller 106b with a different range. For example, referring to the specific structure shown in the figure, the three flow controllers 106b may be flow controllers with ranges of 50 sccm, 1 SLPM, and 20 SLPM, respectively. The 50 sccm flow controller is used for smaller leakage conditions, the 1 SLPM flow controller is used for medium leakage conditions, and the 20 SLPM flow controller is used for larger leakage conditions or the initial pressure build-up stage of the test path. The specific ranges described above are only one implementation method. In other implementation methods, two, three, or more flow control sub-sections 106a with different ranges may be set according to the specifications of the breather valve 200 under test, the leakage range, and the test pressure range.

[0079] At least two flow control sub-segments 106a include a small-range flow control sub-segment 106a and a large-range flow control sub-segment 106a. The small-range flow control sub-segment 106a is used for small leakage testing, and the large-range flow control sub-segment 106a is used for large leakage testing or initial pressure build-up of the test path.

[0080] Specifically, the small-range flow control sub-segment 106a, corresponding to the small-range flow controller 106b, has higher flow resolution and is suitable for use in testing phases where the leakage of the tested breather valve 200 is small, the product chamber pressure is close to the target pressure, or fine adjustment is required. The large-range flow control sub-segment 106a, corresponding to the large-range flow controller 106b, has greater flow capacity and is suitable for use when the product chamber pressure is far from the target pressure, a rapid establishment of test pressure is required, or the leakage of the tested breather valve 200 is large. By selecting different range flow control sub-segments 106a through the valve group 107, the leakage flow control segment 106 can perform tests within a wider leakage range. This avoids the inadequacy of small leakage test resolution caused by always using a single large-range flow controller, or the inadequacy of response and load-bearing capacity under high flow conditions caused by always using a single small-range flow controller.

[0081] Each flow control sub-segment 106a in the leakage flow control section 106 is connected in parallel in the same leakage test gas path section, and each flow control sub-segment 106a can be selectively connected to the positive pressure leakage test path T3 or the negative pressure leakage test path T4 through the switching valve group 107. The unselected flow control sub-segment 106a is in the cut-off state, so that the gas in the leakage test path only passes through the currently selected flow control sub-segment 106a, thereby avoiding inaccurate flow readings caused by multiple flow control sub-segments 106a participating in the flow at the same time.

[0082] It should be noted that the flow controller 106b is used for flow control and flow value acquisition in the leakage test path; the flow regulating valve 107e is located in the start-up regulating section group 104 and is used to regulate the intake or exhaust flow rate during the start-up test. The flow controller 106b and the flow regulating valve 107e have different functions; the former participates in positive pressure leakage tests and negative pressure leakage tests, while the latter participates in positive pressure start-up tests and negative pressure start-up tests. The pneumatic control valves in the switching valve group 107 are used to form or close the corresponding test path and do not undertake the function of reading leakage. Figure 4 and Figure 5 The multiple flow control sub-segments 106a inside the leakage flow control section 106 are only for illustration. The leakage flow control section 106 may include multiple parallel range branches. During actual testing, the switching valve group 107 or the flow controller 106b with the cut-off function connects one of the selected flow control sub-segments 106a to the current test path and cuts off the remaining flow control sub-segments 106a.

[0083] Existing technologies primarily rely on high-precision electronic pressure regulating valves to control the product chamber pressure in a closed loop during leak testing, and then read the flow rate as the leakage result after the pressure stabilizes. However, due to significant differences in the specifications, types, and leakage amounts of the tested breather valves, the electronic pressure regulating valves and their control parameters cannot accommodate all operating conditions, easily leading to long adjustment times. Furthermore, the pressure control accuracy remains limited during ultra-low pressure testing. The improved leak test path uses a flow controller 106b to regulate the gas flow rate entering or exiting the product chamber of the tested breather valve 200, and combines this with the pressure status at the common test node 101 to gradually bring the product chamber pressure closer to the target leak test pressure. When the product chamber pressure stabilizes near the target pressure, the stable flow rate value of the flow controller 106b can be used as the leakage amount, transforming the complex multi-valve structure of the gas path into a relatively simplified one.

[0084] Reference Figure 4 In the positive pressure leakage test path T3, the first pneumatic control valve 107a and the fifth pneumatic control valve 107f are in the conducting state, while the second pneumatic control valve 107b, the third pneumatic control valve 107c, the fourth pneumatic control valve 107d, and the sixth pneumatic control valve 107g are in the closed state. The positive pressure source 300 enters the leakage flow control section 106 through the positive pressure interface 102 and the first pneumatic control valve 107a, and after passing through the selected flow control sub-section 106a and the corresponding flow controller 106b, it enters the connection port 101a through the fifth pneumatic control valve 107f, thereby supplying test gas to the product chamber of the breather valve 200 under test.

[0085] Reference Figure 5In the negative pressure leakage test path T4, the sixth pneumatic control valve 107g and the third pneumatic control valve 107c are in the conducting state, while the first pneumatic control valve 107a, the second pneumatic control valve 107b, the fourth pneumatic control valve 107d, and the fifth pneumatic control valve 107f are in the closed state. The product chamber of the breather valve 200 under test is connected to the leakage flow control section 106 via the connecting port 101a and the third pneumatic control valve 107c, and then connected to the negative pressure interface 103 via the selected flow control sub-section 106a and the corresponding flow controller 106b, and finally connected to the negative pressure interface 103 via the sixth pneumatic control valve 107g. The negative pressure source 400 thus creates a suction effect on the product chamber of the breather valve 200 under test.

[0086] During use, at the beginning of the leak test, a larger flow control segment 106a can be preferentially connected to allow the pressure at the common test node 101 to quickly approach the target leak test pressure. Once the pressure at the common test node 101 gradually approaches the target leak test pressure, a smaller flow control segment 106a can be switched to improve the precision of small flow adjustment and leak reading. For the breather valve 200 with a large leak, a larger flow control segment 106a can be maintained; for the breather valve 200 with a small leak or a low target pressure, a smaller flow control segment 106a can be connected. Unselected flow control segments 106a are shut off by the switching valve group 107, ensuring that the gas in the leak test path only passes through the currently selected flow control segment 106a, thus avoiding crosstalk from multiple flow control segments 106a in parallel and affecting leak reading.

[0087] With the above settings, the leakage flow control section 106 can not only serve as a common gas path for positive pressure leakage testing and negative pressure leakage testing, but also take into account the initial pressure build-up speed, large leakage testing capability and small leakage testing accuracy by selecting different range flow control sub-sections 106a.

[0088] Example 5

[0089] Reference Figures 1-6 This is the fifth embodiment of the present invention. This embodiment differs from the above embodiments in that it also includes an exhaust port 500. The switching valve group 107 is also used to form a pressure relief passage 501. In the pressure relief passage 501, the common test node 101 is connected to the exhaust port 500, and the positive pressure port 102, the negative pressure port 103, the positive pressure start-up adjustment section 104a, the negative pressure start-up adjustment section 104b, and the leakage flow control section 106 are all disconnected from the common test node 101.

[0090] The vent port 500 is used to release residual pressure at the common test node 101 when the test ends, the test is switched, or an abnormal termination occurs. Since the common test node 101 is connected to the product chamber of the breather valve 200 under test, positive or negative pressure may still exist in the common test node 101 after completing a positive pressure start-up test, negative pressure start-up test, positive pressure leakage test, or negative pressure leakage test. By switching the valve assembly 107 to form a pressure relief passage 501, the common test node 101 can be connected to the vent port 500, restoring the product chamber and the common test node 101 to a pressure state that facilitates disassembly, switching, or retesting.

[0091] The exhaust port 500 can be connected to the centralized exhaust location. The common test node 101 is connected to the exhaust port 500 via the pressure relief passage 501. When performing positive pressure start-up test passage T1, negative pressure start-up test passage T2, positive pressure leakage test passage T3, or negative pressure leakage test passage T4, the pressure relief passage 501 is in a closed state to prevent the common test node 101 from being depressurized via the exhaust port 500.

[0092] The switching valve group 107 includes multiple pneumatic control valves. The positive pressure interface 102 is also connected to the drive end of each pneumatic control valve through a pilot air supply passage, so that the positive pressure source 300 connected to the positive pressure interface 102 provides a drive air source for each pneumatic control valve.

[0093] Specifically, after the positive pressure interface 102 is connected to the positive pressure source 300, a portion of the positive pressure gas is used to form the positive pressure start-up test path T1 or the positive pressure leakage test path T3, while another portion of the positive pressure gas can be supplied to the drive end of each pneumatic control valve via the pilot gas supply path to drive the corresponding pneumatic control valve to open or close. This pilot gas supply path is used to provide the actuating power for the pneumatic control valve, and it is functionally distinct from the positive pressure start-up test path T1 and the positive pressure leakage test path T3 used for testing; the gas in the pilot gas supply path is used to drive the valve action and is not directly used as the test gas flow path into the product cavity of the breather valve 200 under test.

[0094] With the above settings, the existing positive pressure source 300 on the test platform can be used to simultaneously provide a driving air source for the pneumatic control valve in the switching valve group 107, thus eliminating the need for a separate pneumatic control driving air source. This ensures that the switching valve group 107 can switch between various test paths and pressure relief paths 501, while also reducing the need for additional driving air sources and their connecting air lines, making the overall air path more centralized.

[0095] During use, after any test item is completed, first close the air control valve corresponding to the current test path to isolate the common test node 101 from the positive pressure port 102, negative pressure port 103, start-up adjustment section group 104, and leakage flow control section 106; then, open the pressure relief passage 501 to connect the common test node 101 to the exhaust port 500, thereby releasing the residual pressure in the product chamber of the tested breathing valve 200 and the common test node 101. After the pressure relief is completed, close the pressure relief passage 501 to restore the air path to standby mode or switch to the next test mode.

[0096] During the switching of test paths, the positive pressure source 300 supplies air to the drive end of each pneumatic control valve in the switching valve group 107 via the pilot air supply path, enabling the corresponding pneumatic control valve to enter the on or off state according to the test item. When a positive pressure start-up test, negative pressure start-up test, positive pressure leakage test, negative pressure leakage test, or pressure relief operation is required, the switching valve group 107 forms the corresponding path through different combinations of pneumatic control valve states and closes the non-current path. Thus, based on the participation of the same positive pressure source 300 in positive pressure testing and pneumatic control valve driving, test path switching and pressure relief reset are realized, reducing the need for independent drive air sources and repeated exhaust air paths.

[0097] Example 6

[0098] This embodiment also provides a breathing valve testing method applicable to the aforementioned portable breathing valve testing platform 100. The method includes determining the test item to be performed based on both the test type and the pressure type. The test types include start-up tests and leakage tests, and the pressure types include positive pressure and negative pressure. Before the test begins, the current functional segment is determined according to the test type of the test item to be performed, and the current pressure interface is determined according to the pressure type of the test item to be performed.

[0099] Specifically, when the test type is a jump test, the jump adjustment segment corresponding to the pressure type is determined as the current functional segment; when the test type is a leakage test, the leakage flow control segment 106 is determined as the current functional segment. When the pressure type is positive pressure, the positive pressure interface 102 is determined as the current pressure interface; when the pressure type is negative pressure, the negative pressure interface 103 is determined as the current pressure interface.

[0100] After determining the current functional segment and the current pressure interface, the control switching valve group 107 constructs the current test path. If the pressure type is positive, the control switching valve group 107 forms a current test path from the current pressure interface through the current functional segment to the common test node 101, allowing the positive pressure test airflow to act from the positive pressure interface 102 side to the common test node 101. If the pressure type is negative, the control switching valve group 107 forms a current test path from the common test node 101 through the current functional segment to the current pressure interface, allowing the negative pressure test airflow to flow from the common test node 101 side through the current functional segment to the negative pressure interface 103.

[0101] While establishing the current test path, the switching valve group 107 also keeps the other pressure interface besides the current pressure interface, as well as the other functional segments besides the current functional segment, disconnected from the common test node 101. Therefore, during the execution of any test item, only the current test path is connected to the common test node 101; non-current test paths do not participate in the air intake, exhaust, or pressure transmission process at the common test node 101, thereby reducing the risk of cross-contamination between different test gas paths affecting the test results.

[0102] According to the above selection rules, when the test type is a jump test and the pressure type is positive pressure, the current functional segment is the positive pressure jump adjustment segment 104a, the current pressure interface is the positive pressure interface 102, the switching valve group 107 forms a positive pressure jump test path that connects the positive pressure interface 102, the positive pressure jump adjustment segment 104a and the common test node 101 in sequence, and cuts off the connection between the negative pressure interface 103, the negative pressure jump adjustment segment 104b and the leakage flow control segment 106 and the common test node 101.

[0103] When the test type is a jump test and the pressure type is negative pressure, the current functional segment is the negative pressure jump adjustment segment 104b, the current pressure interface is the negative pressure interface 103, and the switching valve group 107 forms a negative pressure jump test path that connects the common test node 101, the negative pressure jump adjustment segment 104b and the negative pressure interface 103 in sequence, and cuts off the connection between the positive pressure interface 102, the positive pressure jump adjustment segment 104a and the leakage flow control segment 106 and the common test node 101.

[0104] When the test type is leakage test and the pressure type is positive pressure, the current functional segment is leakage flow control segment 106, the current pressure interface is positive pressure interface 102, and the switching valve group 107 forms a positive pressure leakage test path that sequentially connects positive pressure interface 102, leakage flow control segment 106, and common test node 101, while cutting off the connection between negative pressure interface 103 and start-up adjustment segment group 104 and common test node 101. At this time, the positive pressure leakage test airflow flows through leakage flow control segment 106 to common test node 101, and the positive pressure leakage of the tested breather valve 200 is determined based on the flow rate value in leakage flow control segment 106.

[0105] When the test type is a leakage test and the pressure type is negative pressure, the current functional segment is also the leakage flow control segment 106, and the current pressure interface is the negative pressure interface 103. The switching valve group 107 forms a negative pressure leakage test path that connects the common test node 101, the leakage flow control segment 106, and the negative pressure interface 103 in sequence, and disconnects the connection between the positive pressure interface 102 and the start-up adjustment segment group 104 and the common test node 101. At this time, the negative pressure leakage test airflow flows from the common test node 101 through the same leakage flow control segment 106 to the negative pressure interface 103, and the negative pressure leakage of the tested breather valve 200 is determined based on the flow rate value in the leakage flow control segment 106.

[0106] Therefore, in both positive and negative pressure leakage tests, the leakage flow control section 106 is not set separately, but is used as a shared current functional section for both types of leakage tests. During a positive pressure leakage test, the test airflow in the leakage flow control section 106 flows from the positive pressure interface 102 side to the shared test node 101 side; during a negative pressure leakage test, the test airflow in the same leakage flow control section 106 flows from the shared test node 101 side to the negative pressure interface 103 side. The two leakage tests change the access direction of the leakage flow control section 106 by switching valve group 107, achieving reverse reuse of the same leakage flow control section 106 in both positive and negative pressure leakage tests.

[0107] When switching from one test item to another, the switching valve assembly 107 can be controlled to enter an intermediate isolation state first. In the intermediate isolation state, the shared test node 101, positive pressure interface 102, negative pressure interface 103, start-up adjustment section group 104, and leakage flow control section 106 are all in the closed state. After the current test path is completely disconnected, the target functional section and target pressure interface are re-determined according to the test type and pressure type of the target test item, and the switching valve assembly 107 is controlled to form the target test path.

[0108] Using the above method, the same set of path selection rules can cover four test paths: positive pressure start-up test, negative pressure start-up test, positive pressure leakage test, and negative pressure leakage test. This method does not simply use each gas path sequentially, but rather determines the functional segment based on the test type, the pressure interface and airflow direction based on the pressure type, and simultaneously isolates non-current pressure interfaces and non-current functional segments when forming the current test path. This allows for the orderly switching of multiple test items based on a shared test node 101 and a shared leakage flow control segment 106.

[0109] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise changed, and the nature or number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. Therefore, the invention is not limited to the particular embodiments but extends to a variety of modifications that still fall within the scope of the appended claims.

[0110] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0111] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A portable breathing valve testing platform, characterized in that: include, A common test node (101) is used to connect the breathing valve under test (200). Positive pressure interface (102) and negative pressure interface (103) are used to connect to positive pressure source (300) and negative pressure source (400), respectively. The start-up adjustment section group (104) includes a positive pressure start-up adjustment section (104a) connected to the positive pressure interface (102) and a negative pressure start-up adjustment section (104b) connected to the negative pressure interface (103). Leakage flow control section (106), wherein the leakage flow control section (106) is a common gas path section for positive pressure leakage test and negative pressure leakage test; The switching valve assembly (107) is connected to the common test node (101), the positive pressure port (102), the negative pressure port (103), the start-up adjustment section assembly (104), and the leakage flow control section (106). The switching valve group (107) is used to form only one test path at any given time.

2. The portable breathing valve testing platform according to claim 1, characterized in that: The shared test node (101) includes a connection port (101a) and a pressure tapping port (101b). The connecting port (101a) is connected to the product cavity of the breather valve (200) under test through a connecting pipe to form a test airflow path for air intake or exhaust. One end of the pressure tapping line is connected to a connecting line near the breather valve (200) being tested via a tee, and the other end is connected to the pressure tapping port (101b), which is connected to a pressure detection element (108).

3. The portable breathing valve testing platform according to claim 1, characterized in that: When the test type is a start-up test and the pressure type is positive pressure, the switching valve group (107) connects the positive pressure port (102), the positive pressure start-up adjustment section (104a) and the common test node (101) in sequence; When the test type is a start-up test and the pressure type is negative pressure, the switching valve group (107) connects the common test node (101), the negative pressure start-up adjustment section (104b) and the negative pressure interface (103) in sequence.

4. The portable breathing valve testing platform according to claim 1 or 2, characterized in that: When the test type is leakage test and the pressure type is positive pressure, the switching valve group (107) connects the positive pressure port (102), the leakage flow control section (106) and the common test node (101) in sequence; When the test type is leakage test and the pressure type is negative pressure, the switching valve group (107) connects the common test node (101), the leakage flow control section (106) and the negative pressure interface (103) in sequence.

5. The portable breathing valve testing platform according to claim 1 or 2, characterized in that: The leakage flow control section (106) includes at least two flow control subsections (106a) arranged in parallel. Each flow control subsection (106a) is provided with a flow controller (106b) with a different range. The switching valve group (107) is used to connect the selected flow control subsection (106a) to the test path and to cut off the unselected flow control subsection (106a).

6. The portable breathing valve testing platform according to claim 5, characterized in that: At least two of the flow control sub-segments (106a) include a small-range flow control sub-segment (106a) and a large-range flow control sub-segment (106a), the small-range flow control sub-segment (106a) being used for small leakage testing, and the large-range flow control sub-segment (106a) being used for large leakage testing or initial pressure build-up of the test path.

7. The portable breathing valve testing platform according to claim 2, characterized in that: The pressure detection element (108) includes a first pressure sensor (108a) and a second pressure sensor (108b). The range of the first pressure sensor (108a) is greater than the range of the second pressure sensor (108b). The first pressure sensor (108a) is connected to the pressure tap (101b), and the second pressure sensor (108b) is selectively connected to the pressure tap (101b) through a protection valve (108c).

8. The portable breathing valve testing platform according to claim 7, characterized in that: The protection valve (108c) connects the second pressure sensor (108b) and the pressure tap (101b) when the pressure at the pressure tap (101b) is within the allowable range of the second pressure sensor (108b), and disconnects the second pressure sensor (108b) and the pressure tap (101b) when the pressure at the pressure tap (101b) exceeds the allowable range of the second pressure sensor (108b).

9. The portable breathing valve testing platform according to claim 1, characterized in that: It also includes an exhaust port (500), and the switching valve group (107) is also used to form a pressure relief passage (501). In the pressure relief passage (501), the common test node (101) is connected to the exhaust port (500), and the positive pressure port (102), the negative pressure port (103), the positive pressure start-up adjustment section (104a), the negative pressure start-up adjustment section (104b) and the leakage flow control section (106) are all disconnected from the common test node (101).

10. The portable breathing valve testing platform according to claim 1 or 9, characterized in that: The switching valve group (107) includes multiple pneumatic control valves. The positive pressure interface (102) is also connected to the drive end of each of the pneumatic control valves through a pilot air supply passage, so that the positive pressure source (300) connected to the positive pressure interface (102) provides a drive air source for each of the pneumatic control valves.

11. A method for testing a breathing valve, applicable to the portable breathing valve testing platform according to any one of claims 1 to 10, characterized in that: include, Determine the current functional segment and current stress interface based on the test type and stress type of the test project to be executed; Among them, when the test type is a start-up test, the current functional segment is the start-up adjustment segment corresponding to the pressure type; when the test type is a leakage test, the current functional segment is the leakage flow control segment (106). When the pressure type is positive pressure, the current pressure interface is the positive pressure interface (102), and the switching valve group (107) is controlled to form the current test path from the current pressure interface through the current functional segment to the common test node (101); When the pressure type is negative pressure, the current pressure interface is the negative pressure interface (103), and the switching valve group (107) is controlled to form the current test path from the common test node (101) through the current functional segment to the current pressure interface; When forming the current test path, the control switching valve group (107) cuts off the connection between the other pressure interface besides the current pressure interface and the other functional segments besides the current functional segment and the common test node (101).

12. The breathing valve testing method according to claim 11, characterized in that: When the test type is a start-up test and the pressure type is positive pressure, the control switching valve group (107) connects the positive pressure port (102), the positive pressure start-up adjustment section (104a) and the common test node (101) in sequence, and cuts off the connection between the negative pressure port (103), the negative pressure start-up adjustment section (104b) and the leakage flow control section (106) and the common test node (101); When the test type is a start-up test and the pressure type is negative pressure, the control switching valve group (107) connects the common test node (101), the negative pressure start-up adjustment section (104b) and the negative pressure interface (103) in sequence, and cuts off the connection between the positive pressure interface (102), the positive pressure start-up adjustment section (104a) and the leakage flow control section (106) and the common test node (101).

13. The breathing valve testing method according to claim 11, characterized in that: When the test type is leakage test and the pressure type is positive pressure, the control switching valve group (107) connects the positive pressure port (102), leakage flow control section (106) and common test node (101) in sequence, and cuts off the connection between the negative pressure port (103) and the start-up adjustment section group (104) and the common test node (101); When the test type is leakage test and the pressure type is negative pressure, the control switching valve group (107) connects the common test node (101), leakage flow control section (106) and negative pressure interface (103) in sequence, and cuts off the connection between the positive pressure interface (102) and the start-up adjustment section group (104) and the common test node (101).

14. The method for testing a breathing valve according to any one of claims 11 to 13, characterized in that: When switching from one test item to another, first control the switching valve group (107) to shut down the current test path, so that the common test node (101) and the positive pressure interface (102), negative pressure interface (103), start-up adjustment section group (104) and leakage flow control section (106) are all in a shut-down isolation state, and then form the target test path according to the test type and pressure type of the target test item.

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