Air permeability testing device for filter screen of gas generator

Abstract

The utility model discloses an air permeability testing device for a filter screen of a gas generator, and aims to provide the air permeability testing device for the filter screen of the gas generator, which can improve the testing accuracy, the operation convenience and the efficiency. The device comprises a test box, the test box is connected with a sealing cover, the sealing cover is detachably connected with a filter screen, one side of the filter screen is provided with an air inlet pipe, the other side of the filter screen is provided with an air outlet pipe, the air inlet pipe and the air outlet pipe are connected with pressure sensors, and the air inlet pipe and the air outlet pipe are in sealed connection with the test box. The device has the beneficial effects that the air permeability test of the filter screen of the gas generator is improved; the test is efficient and accurate, and the filter screen can be quickly replaced for test; the air tightness is improved; the use convenience is improved; and the structural connection and test stability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas generator testing, in particular to an air permeability testing device for a filter screen of a gas generator. Background Art

[0002] Gas generators are mainly used in automobile safety systems. When a vehicle collides, the gas generator inflates the airbag and deploys it to protect the passengers. The air permeability of the gas generator filter is a crucial safety parameter, so it is necessary to test the air permeability of the gas generator filter.

[0003] China Patent Authorization Announcement Number: CN 218496700 U, Authorization Announcement Date: February 17, 2023. This utility model relates to a breathable textile fabric air permeability testing device, comprising a bellows, a fan placed on the inner bottom surface of the bellows, an air distribution plate arranged parallel to and above the fan, the air distribution plate having two sides fixedly connected to the inner wall of the bellows, and a filter screen arranged parallel to and above the air distribution plate, the filter screen having two sides fixedly connected to the inner wall of the bellows. The shortcomings of this technical solution are: 1. Visually judging the air permeability of the fabric by the blowing of the ribbon results in many influencing factors and insufficient quantification of the results, which reduces the accuracy of the test; 2. The replacement efficiency is low when testing different batches, which is not conducive to rapid testing.

[0004] In summary, the device has the disadvantages of low air permeability test accuracy and inconvenience for efficient testing. Utility Model Content

[0005] The utility model aims to overcome the shortcomings of the prior art devices in terms of low air permeability test accuracy and inconvenience in efficient testing, and provides an air permeability test device for a filter screen of a gas generator, which improves test accuracy, operational convenience and efficiency.

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

[0007] A device for testing the air permeability of a filter screen for a gas generator comprises a test box connected to a sealing cover, the sealing cover being detachably connected to a filter screen, an air inlet pipe being provided on one side of the filter screen, an air outlet pipe being provided on the other side of the filter screen, both the air inlet pipe and the air outlet pipe being connected to pressure sensors, and both the air inlet pipe and the air outlet pipe being sealed to the test box.

[0008] The inside of the test box is sealed by the sealing cover, the filter screen is placed in the sealed space formed by the sealing cover, one side of the filter screen is connected with the air inlet pipe through the test box, so that the air inlet pipe introduces the gas with fixed pressure into the test box, and the gas flows through one side of the filter screen to the other side, the other side of the filter screen is provided with the air outlet pipe connected with the test box, the air outlet pipe is communicated with the outside, so that the gas flows through the filter screen and is output, wherein the pressure sensor on the air inlet pipe monitors the pressure of the entering gas, the pressure sensor on the air outlet pipe monitors the pressure of the gas output from the filter screen, and then the air permeability of the filter screen is realized through the structure design and the pressure sensor, so as to judge whether it meets the use standard of the gas generator; wherein the filter screen and the sealing cover are detachably connected, so as to quickly replace different filter screens for testing, the air inlet pipe and the air outlet pipe are sealingly connected with the test box, and cooperate with the sealing cover to ensure the air tightness and improve the testing accuracy. The effect of realizing the air permeability test of the filter screen of the gas generator, testing high efficiency and accuracy, and facilitating quick replacement of the filter screen is achieved.

[0009] As preferred, the sealing cover comprises an upper sealing cover, a lower sealing cover and a sealing connecting strip, the sealing connecting strip is connected with the test box, the surface center part of the upper sealing cover is connected with an upper limiting boss and is an integral structure, the surface center part of the lower sealing cover is connected with a lower limiting boss and is an integral structure, the upper limiting boss is arranged opposite to the lower limiting boss, one end of the sealing connecting strip is connected with the upper limiting boss, the other end of the sealing connecting strip is connected with the lower limiting boss, and the filter screen is connected with the upper limiting boss, the lower limiting boss and the sealing connecting strip. The sealing cover comprises the upper sealing cover, the lower sealing cover and the sealing connecting strip, the protruding part of the surface center part of the upper sealing cover is provided as the upper limiting boss, the protruding part of the surface center part of the lower sealing cover is provided as the lower limiting boss, and the cross-sectional shape of the upper and lower sealing covers is stepped, so as to facilitate the contact with the periphery of the filter screen, the sealing connecting strip connects the upper limiting boss and the lower limiting boss into a rectangle, and the periphery of the filter screen is fully matched with the contour enclosed by the sealing strip, the upper limiting boss and the lower limiting boss to prevent air leakage. The effect of further improving the air tightness and ensuring the testing accuracy is achieved.

[0010] As preferred, the test box comprises a bottom plate, a fixed side plate, a replacement side plate and an upper top plate, the bottom plate is connected with the fixed side plate perpendicularly, the replacement side plate is connected with the bottom plate perpendicularly, and the upper top plate is inserted with the fixed side plate. The replacement side plate is detachably connected with the fixed side plate and the bottom plate, the fixed side plate is provided with a limiting groove, the limiting groove is embedded with a sealing ring one, and the replacement side plate is pressure-connected with the sealing ring one. The fixed side plate in the test box is provided with two and is connected with the bottom plate perpendicularly, the upper top plate is inserted between the two fixed side plates for connection, the replacement side plate is provided with two and is connected with the fixed side plate and the bottom plate through detachable connection, and then the test box structure is formed, the side edge is sealed through the connection of the replacement side plate and the fixed side plate after connection, the upper sealing cover and the lower sealing cover are sealed up and down, the sealing property of the test box is ensured, and the filter screen can be quickly replaced. The effect of improving the use convenience is achieved.

[0011] Preferably, the refueling side plate is equipped with a connecting rod and a pressure ring. One end of the connecting rod is connected to the refueling side plate, and the other end of the connecting rod is connected to one side of the pressure ring. The other side of the pressure ring is pressed against the filter screen. The connecting rod and the pressure ring are connected to the refueling side plate. When the refueling side plate is connected, the pressure ring moves synchronously with the connecting rod. Once the refueling side plate is connected, the pressure ring presses the filter screen tightly, preventing the filter screen from moving during testing and facilitating filter replacement. This improves test stability and facilitates replacement.

[0012] Preferably, the refueling side panel is provided with a through-hole 1 and a connecting screw hole. The air outlet pipe is plugged into the through-hole 1. The air outlet pipe is sleeved with a sealing seat and a second sealing ring. The sealing seat is threadedly connected to the connecting screw hole. The second sealing ring is positioned at the connection between the air outlet pipe and the refueling side panel, and the sealing seat is crimped onto the second sealing ring. The air outlet pipe is connected to the refueling side panel through the through-hole 1, so that one end of the air outlet pipe is connected to the refueling side panel. The sealing sleeve is simultaneously fitted onto the air outlet pipe and screwed into the connecting screw hole of the refueling side panel to provide a more stable connection for the air outlet pipe. During the connection, the second sealing ring is tightened to maintain a high degree of sealing at the connection between the air outlet pipe and the through-hole 1. This improves the stability of the structural connection and ensures airtightness.

[0013] Preferably, the upper plate, upper sealing cover, and upper limit boss each have a second through-hole, into which the air intake pipe is plugged. The upper plate, upper sealing cover, and upper limit boss each have two interconnected through-holes, allowing one end of the air intake pipe to pass through each of the two through-holes and into the test chamber. The upper sealing cover and the air intake pipe are tightly attached to ensure airtightness, thus facilitating structural connection and ensuring airtightness.

[0014] The beneficial effects of the utility model are: the device improves the air permeability test of the filter of the gas generator; the test is efficient and accurate while facilitating the rapid replacement of the filter for testing; the air tightness is improved; the convenience of use is improved; and the structural connection and test stability are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the utility model;

[0016] Figure 2 yes Figure 1 Exploded diagram;

[0017] Figure 3 yes Figure 1 sectional view of .

[0018] In the figure: 1. Test box, 2. Filter, 3. Inlet pipe, 4. Outlet pipe, 5. Pressure sensor, 6. Upper sealing cover, 7. Lower sealing cover, 8. Sealing connecting strip, 9. Upper limit boss, 10. Lower limit boss, 11. Bottom plate, 12. Fixed side plate, 13. Refueling side plate, 14. Upper top plate, 15. Limit groove, 16. Sealing ring 1, 17. Connecting rod, 18. Pressing ring, 19. Through hole 1, 20. Connecting screw hole, 21. Sealing seat, 22. Sealing ring 2, 23. Through hole 2, 24. Base. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0020] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0021] Unless otherwise specified, the relative arrangement of components, numerical expressions, and values ​​described in these embodiments do not limit the scope of this application. For ease of description, spatially relative terms such as "upper," "lower," "left," and "right" are used in the embodiments to illustrate the relationship of one element or feature shown in the figures to another. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device during use or operation. For example, if the device in the figure is inverted, an element described as being "below" another element or feature would be positioned "above" the other element or feature. Therefore, the exemplary term "below" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to scale. Technologies, processes, and equipment known to those skilled in the relevant art may not be discussed in detail, but, where appropriate, should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.It should be noted that like reference numerals and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0022] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0023] Example 1:

[0024] like Figure 1 、 2 As shown, a permeability testing device for a filter screen of a gas generator includes a test box 1, the test box 1 is connected to a sealing cover, the sealing cover is removed and connected to a filter screen 2, an air inlet pipe 3 is provided on one side of the filter screen 2, and an air outlet pipe 4 is provided on the other side of the filter screen 2, the air inlet pipe 3 and the air outlet pipe 4 are both connected to a pressure sensor 5, and the air inlet pipe 3 and the air outlet pipe 4 are both sealed to the test box 1.

[0025] like Figure 2 、 3As shown, the sealing cover includes an upper sealing cover 6, a lower sealing cover 7 and a sealing connecting strip 8, the sealing connecting strip 8 is connected to the test box 1, the surface center of the upper sealing cover 6 is connected to the upper limit boss 9 and is an integrated structure, the surface center of the lower sealing cover 7 is connected to the lower limit boss 10 and is an integrated structure, the upper limit boss 9 and the lower limit boss 10 are arranged opposite to each other, one end of the sealing connecting strip 8 is connected to the upper limit boss, and the other end of the sealing connecting strip 8 is connected to the lower limit boss 10, and the filter 2 is connected to the upper limit boss 9, the lower limit boss 10 and the sealing connecting strip 8.

[0026] like Figure 2 、 3 As shown, the test box 1 includes a bottom plate 11, a fixed side plate 12, a refueling side plate 13 and an upper top plate 14. The bottom plate 11 is vertically connected to the fixed side plate 12, the refueling side plate 13 is vertically connected to the bottom plate 11, the upper top plate 14 is plugged into the fixed side plate 12, the refueling side plate 13 is detachably connected to the fixed side plate 12 and the bottom plate 11, the fixed side plate 12 is provided with a limiting groove 15, the limiting groove 15 is embedded with a sealing ring 16, and the refueling side plate 13 is press-fitted with the sealing ring 16.

[0027] like Figure 3 As shown, the refueling side plate 13 is provided with a connecting rod 17 and a pressure ring 18 , one end of the connecting rod 17 is connected to the refueling side plate 13 , the other end of the connecting rod 17 is connected to one side of the pressure ring 18 , and the other side of the pressure ring 18 is press-connected to the filter screen 2 .

[0028] like Figure 2 、 3 As shown, the refueling side plate 13 is provided with a first through-hole 19 and a connecting screw hole 20. The outlet pipe 4 is plugged into the first through-hole 19. The outlet pipe 4 is sleeved with a sealing seat 21 and a second sealing ring 22. The sealing seat 21 is threadedly connected to the connecting screw hole 20. The second sealing ring 22 is placed at the connection between the outlet pipe 4 and the refueling side plate 13. The sealing seat 21 and the second sealing ring 22 are press-fitted. The upper top plate 14, the upper sealing cover 6, and the upper limit boss 9 are all provided with a second through-hole 23. The intake pipe 3 is plugged into the second through-hole 23.

[0029] like Figure 1-3 As shown: the spacing between the lower limit boss 10 at one end of the intake pipe 3 is greater than or equal to half of the spacing between the upper limit boss 9 and the lower limit boss 10 to ensure smooth air intake. The other end of the intake pipe 3 is connected to an external compressed air machine for gas transportation.

[0030] The bottom plate 11 and the fixed side plate 12 are fixedly connected and are provided with sealant at the connection points to ensure airtightness.

[0031] In use: through the inlet pipe 3 by fixed pressure test gas, the pressure sensor 5 on the inlet pipe 3 shows the pressure of input gas, the gas flows between two filter screens 2, and diffuses from the filter screen 2 to the test box 1, and then flows out from the outlet pipe 4, the pressure value shown by the pressure sensor 5 on the outlet pipe 4 tests the air permeability of the filter screen 2 to judge the filtering efficiency of the filter screen for the gas generator.

[0032] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A device for testing the air permeability of a filter screen for a gas generator, characterized in that: The invention comprises a test box (1), wherein the test box (1) is connected to a sealing cover, wherein the sealing cover is detachably connected to a filter screen (2), an air inlet pipe (3) is provided on one side of the filter screen (2), and an air outlet pipe (4) is provided on the other side of the filter screen (2), wherein the air inlet pipe (3) and the air outlet pipe (4) are both connected to a pressure sensor (5), and the air inlet pipe (3) and the air outlet pipe (4) are both sealedly connected to the test box (1).

2. The air permeability testing device for a filter screen for a gas generator according to claim 1, characterized in that: The sealing cover comprises an upper sealing cover (6), a lower sealing cover (7) and a sealing connection strip (8), wherein the sealing connection strip (8) is connected to the test box (1), the center portion of the surface of the upper sealing cover (6) is connected to an upper limit boss (9) and is an integrated structure, the center portion of the surface of the lower sealing cover (7) is connected to a lower limit boss (10) and is an integrated structure, the upper limit boss (9) and the lower limit boss (10) are arranged opposite to each other, one end of the sealing connection strip (8) is connected to the upper limit boss, and the other end of the sealing connection strip (8) is connected to the lower limit boss (10), and the filter screen (2) is connected to the upper limit boss (9), the lower limit boss (10) and the sealing connection strip (8).

3. The air permeability testing device for a filter screen for a gas generator according to claim 2, characterized in that: The test box (1) includes a bottom plate (11), a fixed side plate (12), a material-changing side plate (13) and an upper top plate (14); the bottom plate (11) is vertically connected to the fixed side plate (12); the material-changing side plate (13) is vertically connected to the bottom plate (11); the upper top plate (14) is plugged into the fixed side plate (12); the material-changing side plate (13) is detachably connected to the fixed side plate (12) and the bottom plate (11); the fixed side plate (12) is provided with a limiting groove (15); the limiting groove (15) is embedded with a sealing ring (16); the material-changing side plate (13) is press-fitted with the sealing ring (16).

4. The air permeability testing device for a filter screen for a gas generator according to claim 3, characterized in that: The refueling side plate (13) is provided with a connecting rod (17) and a pressure ring (18), one end of the connecting rod (17) is connected to the refueling side plate (13), the other end of the connecting rod (17) is connected to one side of the pressure ring (18), and the other side of the pressure ring (18) is press-connected to the filter screen (2).

5. The air permeability testing device for a filter screen for a gas generator according to claim 4, characterized in that: The refueling side plate (13) is provided with a through hole 1 (19) and a connecting screw hole (20), the air outlet pipe (4) is plugged into the through hole 1 (19), the air outlet pipe (4) is sleeved with a sealing seat (21) and a sealing ring 2 (22), the sealing seat (21) is threadedly connected to the connecting screw hole (20), the sealing ring 2 (22) is placed at the connection between the air outlet pipe (4) and the refueling side plate (13), and the sealing seat (21) and the sealing ring 2 (22) are press-fitted.

6. The air permeability testing device for a filter screen for a gas generator according to claim 5, characterized in that: The upper top plate (14), the upper sealing cover (6) and the upper limit boss (9) are all provided with a second through hole (23), and the air inlet pipe (3) is plugged into the second through hole (23).

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