Measuring device
By designing a measuring device including a box, test piece and test piece, and using partitions and inflatable holes to simulate a large gap loose fit connection method, the problem of gas leakage measurement in the aerospace field is solved and the accurate measurement of the leakage degree is achieved.
Patent Information
- Application Number
- CN202421777161.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-07-25
AI Technical Summary
In the aerospace field, the use of a large gap loose fit connection method causes gas leakage, and the prior art is difficult to effectively measure the degree of leakage.
A measuring device is designed, including a box, a test piece and a test piece. The box cavity is divided into two chambers through a partition. The inflatable hole and the installation hole are used to simulate a loose fit connection method of large gaps, and the leakage is measured through a gas flow gauge and a gas pressure gauge.
The device can simply and conveniently measure the degree of gas leakage at the loose fitting connection of large gaps, ensure the accuracy and reliability of measurement results, and is suitable for the airtightness test of various large gap fasteners.
Smart Images
Figure CN222812514U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of measurement, in particular to a measuring device. Background Art
[0002] In the field of aerospace, structures such as fairings and main landing gear need to meet both external airtightness load requirements and in-plane loads during design. For the sake of weight reduction and deformation coordination, parts are usually connected using a large-clearance loose fit connection method, that is, using large-clearance fasteners to connect parts. However, this connection method will inevitably lead to a certain amount of gas leakage. In aircraft design, there are certain restrictions on the amount of gas leakage.
[0003] Therefore, it is necessary to provide a measuring device to measure the gas leakage degree of a large-clearance loose-fit connection. Utility Model Content
[0004] The utility model aims to provide a measuring device with simple structure and convenient operation, which can measure the gas leakage degree of a large-gap loose-fit connection.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] The utility model aims to provide a measuring device with simple structure and convenient operation, which can measure the gas leakage degree of a large-gap loose-fit connection.
[0007] To achieve this purpose, the utility model adopts the following technical solutions:
[0008] Measuring device, comprising:
[0009] A box body, the box body having a cavity, a partition plate is arranged in the box body, the partition plate divides the cavity into a first chamber and a second chamber, a plurality of inflation holes and a plurality of mounting holes are opened on the box body, a plurality of the inflation holes are communicated with the first chamber, a plurality of the mounting holes are communicated with the second chamber, and a plurality of first through holes are opened on the partition plate;
[0010] A test piece, wherein the test piece is provided with a plurality of second through holes, the test piece is placed on the partition, the plurality of second through holes and the plurality of first through holes are opposite to each other, and large-gap fasteners are passed through the first through holes and the second through holes to fix the test piece to the partition;
[0011] A plurality of test pieces are connected to the second chamber one by one through the plurality of mounting holes.
[0012] Preferably, the first through hole and the second through hole have different apertures.
[0013] Preferably, a slot is provided on the partition, and the test piece is clamped in the slot.
[0014] Preferably, the box comprises:
[0015] A box body, wherein the box body has a first opening;
[0016] A first cover plate and a sealing cover are arranged on the first opening. The first cover plate, the box body and the partition plate are jointly arranged to form the first chamber.
[0017] Preferably, a first sealing member is disposed between the first cover plate and the box body.
[0018] Preferably, the first sealing member is made of rubber.
[0019] Preferably, the box body further has a second opening, a second cover plate is sealingly covered on the second opening, and the second cover plate, the box body and the partition plate are jointly arranged to form the second chamber.
[0020] Preferably, a second sealing member is disposed between the second cover plate and the box body.
[0021] Preferably, the second sealing member is made of rubber.
[0022] Preferably, the number of the mounting holes is two, the number of the test pieces is two, the two test pieces are respectively a gas flow meter and a pressure gauge, the gas flow meter can test the gas flow rate in the second chamber, and the pressure gauge can test the air pressure in the second chamber.
[0023] Beneficial effects of the utility model:
[0024] This measuring device includes a box, a specimen and several test pieces. The box has a cavity. A partition is arranged in the box, and the partition divides the cavity into a first chamber and a second chamber. The box is provided with several inflation holes and several mounting holes. The several inflation holes are all connected to the first chamber, and the several mounting holes are all connected to the second chamber. The partition is provided with several first through holes; the specimen is provided with several second through holes, and the specimen is placed on the partition. The several second through holes and the several first through holes are opposite to each other. Large gap fasteners are passed through the first through holes and the second through holes to fix the specimen to the partition, and the several test pieces are connected to the second chamber through the mounting holes.
[0025] Before the test, the first cavity is filled with gas of a certain pressure through the inflation hole, and the corresponding data is measured and recorded through the test piece; then the test piece is placed on the partition so that the first through holes are directly opposite to the second through holes, and the large gap fasteners are used to penetrate the first through holes and the second through holes to fix the test piece on the partition, that is, the large gap loose fit connection mode in the box is simulated; finally, the first cavity is filled with gas with the same pressure as before through the inflation hole, and the corresponding data is measured through the test piece, and the corresponding difference between the data obtained from the two measurements is compared to obtain the leakage amount of the large gap loose fit connection on the test piece. The test piece is fixed in the box by using large gap fasteners to simulate the large gap loose fit connection mode in actual production and manufacturing, so as to conduct the test, and the relevant data of the second cavity is tested by inflating the first cavity and using the test piece to realize the quantitative test of the air tightness of the large gap loose fit connection on the test piece. This measuring device has a simple structure and is easy to operate, and can accurately measure the corresponding values to determine whether it meets the leakage standard. It should be noted that any structure used to achieve a large gap loose fit connection can be tested using this test device and the aforementioned test method, that is, this test device can test the air tightness of large gap fasteners of any structure when used in large gap loose fit connections. This test device has strong applicability and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a partial structural schematic diagram of the testing device provided by the utility model;
[0027] Figure 2 It is an exploded diagram of the test device provided by the utility model;
[0028] Figure 3 It is a cross-sectional view of the testing device provided by the utility model.
[0029] In the figure:
[0030] 1. Box body; 11. Inflating hole; 12. Mounting hole; 13. Box body; 14. First cover plate; 15. Second cover plate; 16. First sealing member; 17. Second sealing member; 18. First chamber; 19. Second chamber;
[0031] 2. partition; 21. card slot;
[0032] 3. Test piece;
[0033] 4. Large clearance fasteners. DETAILED DESCRIPTION
[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0037] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0038] In the field of aerospace, structures such as fairings and main landing gear need to meet both external airtightness load requirements and in-plane loads during design. For the sake of weight reduction and deformation coordination, parts are usually connected using a large-clearance loose fit connection method, that is, using large-clearance fasteners to connect parts. However, this connection method will inevitably lead to a certain amount of gas leakage. In aircraft design, there are certain restrictions on the amount of gas leakage.
[0039] To measure the gas leakage in loose fitting connections with large clearances, such as Figure 1-Figure 3As shown, the present embodiment provides a measuring device, which includes a box body 1, a specimen 3 and a plurality of test pieces 3. The box body 1 has a cavity, a partition 2 is arranged in the box body 1, the partition 2 divides the cavity into a first chamber 18 and a second chamber 19, a plurality of inflation holes 11 and a plurality of mounting holes 12 are provided on the box body 1, the plurality of inflation holes 11 are all connected to the first chamber 18, the plurality of mounting holes 12 are all connected to the second chamber 19, a plurality of first through holes are provided on the partition 2; a plurality of second through holes are provided on the specimen 3, the specimen 3 is placed on the partition 2, the plurality of second through holes and the plurality of first through holes are opposite to each other, a large gap fastener 4 is passed through the first through hole and the second through hole to fix the specimen 3 to the partition 2, and the plurality of test pieces 3 are connected to the second chamber 19 through the mounting holes 12.
[0040] Before the test, the first cavity is filled with gas of a certain pressure through the gas filling hole 11, and the corresponding data is measured and recorded through the test piece 3; then the test piece 3 is placed on the partition 2 so that the first through holes are directly opposite to the second through holes, and the large gap fasteners 4 are used to penetrate the first through holes and the second through holes to fix the test piece 3 on the partition 2, that is, the large gap loose fit connection mode in actual production and manufacturing is simulated in the box 1; finally, the first cavity is filled with gas with the same pressure as before through the gas filling hole 11, and the corresponding data is measured through the test piece 3, and the corresponding difference between the data obtained from the two measurements is compared to obtain the leakage amount of the large gap loose fit connection on the test piece 3. The test piece 3 is fixed in the box 1 by using the large gap fastener 4 to simulate the large gap loose fit connection mode in actual production and manufacturing for testing, and the relevant data of the second cavity are tested by filling the first cavity with gas and using the test piece 3 to achieve quantitative testing of the air tightness of the large gap loose fit connection on the test piece 3. This measuring device has a simple structure and is easy to operate. It can accurately measure the corresponding values to determine whether it meets the leakage standard. It should be noted that any structure used to achieve a large gap loose fit connection can be tested using this test device and the aforementioned test method, that is, this test device can test the air tightness of a large gap fastener 4 of any structure when used in a large gap loose fit connection. This test device has strong applicability and a wide range of applications.
[0041] In some embodiments, the partition 2 and the box body 1 are designed to be split, that is, after the partition 2 and the box body 1 are formed separately, the partition 2 is fixed to the inside of the box body 1 by gluing, welding or screwing. The production method in which the partition 2 and the box body 1 are formed separately and then assembled can make the production process of this measuring device more flexible and efficient.
[0042] In this embodiment, the partition 2 and the box body 1 are integrally formed, which can ensure that the connection between the partition 2 and the box body 1 is completely sealed, and there will be no air leakage, thereby preventing the test effect from being affected by the poor airtightness of the connection between the partition 2 and the box body 1. Specifically, Figure 1 , Figure 2 As shown, there are two mounting holes 12, two test pieces 3, and the two test pieces 3 are a gas flow meter and a barometer. The gas flow meter can test the gas flow rate in the second chamber 19, and the barometer can test the air pressure in the second chamber 19. The gas flow meter can accurately measure the gas flow rate in the second chamber 19, and the barometer can accurately measure the air pressure change in the second chamber 19. Combining the measurement results of the gas flow meter and the barometer, the air tightness of the large-gap loose-fit connection can be comprehensively evaluated. By comparing the data difference of the zero-time test before and after the installation of the test piece 3, it can be accurately determined whether the large-gap loose-fit connection on the test piece 3 leaks and the extent of the leakage.
[0043] It is worth mentioning that the type and test quantity of the test piece 3 can be determined according to actual test requirements, and this embodiment does not limit this.
[0044] In an optional embodiment, the first through hole and the second through hole have different apertures, so as to realize the displacement and deformation coordination function of the large-gap fastener 4 and better simulate the large-gap loose-fit connection mode in actual production.
[0045] Specifically, Figure 1 , Figure 2 As shown, a slot 21 is provided on the partition 2, and the test piece 3 is clamped in the slot 21. The design of the slot 21 can ensure that the position of the test piece 3 on the partition 2 is stable, and the installation is simpler and faster, without spending a lot of time to align each second through hole with the first through hole, and the test piece 3 can be automatically aligned by simply clamping it in the slot 21.
[0046] In some embodiments, the card slot 21 is provided on the side of the partition 2 facing the first chamber 18; in other embodiments, the card slot 21 is provided on the side of the partition 2 facing the second chamber 19; in this embodiment, the card slot 21 is provided on both sides of the partition 2. It is worth mentioning that the specific location of the card slot 21 will not affect the test results, and this embodiment does not limit this.
[0047] Furthermore, the partition 2 is provided with a through groove, which is connected to the card slot 21. When the test piece 3 is placed in the card slot 21, the test piece 3 can cover the through groove. If the test piece 3 itself has an airtightness defect, the gas filled in the first chamber 18 will leak along the through groove to the second chamber 19. When testing, it is possible to simultaneously detect whether the test piece 3 itself has an airtightness defect.
[0048] In this embodiment, if Figure 2, Figure 3 As shown, the box 1 includes a box body 13 and a first cover plate 14. The box body 13 has a first opening. The first cover plate 14 is sealed and covered at the first opening. The first cover plate 14, the box body 13 and the partition plate 2 are jointly arranged to form a first chamber 18. The first cover plate 14 is sealed and covered at the first opening, which ensures good sealing of the box 1 itself and prevents interference with the test results. The first cover plate 14 can be easily opened and closed, which is convenient for installing and removing the test piece 3.
[0049] Specifically, a first sealing member 16 is sandwiched between the first cover plate 14 and the box body 13. The first sealing member 16 can effectively fill the small gap between the first cover plate 14 and the box body 1, improve the sealing performance of the box 1, and ensure the accuracy of the test results.
[0050] In an optional embodiment, the material of the first sealing member 16 is rubber, which is cheap and easy to obtain. In other embodiments, the material of the first sealing member 16 may also be silicone, which is not limited in this embodiment.
[0051] In this embodiment, if Figure 2 , Figure 3 As shown, the box body 13 also has a second opening, and the second cover plate 15 is sealed and covered at the second opening. The second cover plate 15, the box body 1 and the partition plate 2 are jointly arranged to form a second chamber 19. The second cover plate 15 is sealed and covered at the second opening, which ensures good sealing of the box body 1 itself and prevents interference with the test results. The second cover plate 15 can be easily opened and closed, which is convenient for installing and removing the test piece 3.
[0052] Specifically, a second sealing member 17 is sandwiched between the second cover plate 15 and the box body 13. The second sealing member 17 can effectively fill the small gap between the second cover plate 15 and the box body 1, improve the sealing performance of the box 1, and ensure the accuracy of the test results.
[0053] In an optional embodiment, the material of the second sealing member 17 is rubber, which is cheap and easy to obtain. In other embodiments, the material of the second sealing member 17 may also be silicone, which is not limited in this embodiment.
[0054] The following describes the testing process using this test device:
[0055] 1. Fill the first cavity with gas of a certain pressure through the gas filling hole 11, and record the data measured by the gas flow meter and the data measured by the pressure gauge;
[0056] 2. Open the first cover plate 14 or the second cover plate 15, clamp the test piece 3 in the clamping groove 21, use the large gap fastener 4 to fix the test piece 3 on the partition plate 2, and close the first cover plate 14 or the second cover plate 15;
[0057] 3. Fill the first cavity with gas of the same pressure as before through the gas filling hole 11, and record the data measured by the gas flow meter and the data measured by the pressure gauge;
[0058] 4. Calculate the difference between the data before and after the gas flow meter and the data before and after the pressure gauge to obtain the leakage at the three loose-fit connections with the largest gaps of the test piece.
[0059] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.
Claims
1. A measuring device, characterized in that include: A box body (1), the box body (1) having a cavity, a partition (2) being arranged inside the box body (1), the partition (2) dividing the cavity into a first chamber (18) and a second chamber (19), the box body (1) being provided with a plurality of inflation holes (11) and a plurality of mounting holes (12), the plurality of inflation holes (11) being in communication with the first chamber (18), the plurality of mounting holes (12) being in communication with the second chamber (19), and the partition (2) being provided with a plurality of first through holes; A test piece (3), wherein the test piece (3) is provided with a plurality of second through holes, the test piece (3) is placed on the partition (2), the plurality of second through holes and the plurality of first through holes are opposite to each other, and a large gap fastener (4) is passed through the first through holes and the second through holes to fix the test piece (3) to the partition (2); A plurality of test pieces (3), wherein the plurality of test pieces (3) are connected one by one to the second chamber (19) through the plurality of mounting holes (12).
2. The measuring device according to claim 1, characterized in that The first through hole and the second through hole have different hole diameters.
3. The measuring device according to claim 1, characterized in that The partition plate (2) is provided with a slot (21), and the test piece (3) is clamped in the slot (21).
4. The measuring device according to claim 1, characterized in that The housing (1) comprises: A box body (13), wherein the box body (13) has a first opening; A first cover plate (14) is sealed and arranged on the first opening; the first cover plate (14), the box body (13) and the partition plate (2) are jointly arranged to form the first chamber (18).
5. The measuring device according to claim 4, characterized in that A first sealing member (16) is sandwiched between the first cover plate (14) and the box body (13).
6. The measuring device according to claim 5, characterized in that The first sealing member (16) is made of rubber.
7. The measuring device according to claim 4, characterized in that The box body (13) also has a second opening, and a second cover plate (15) is sealingly covered on the second opening. The second cover plate (15), the box body (13) and the partition plate (2) are jointly arranged to form the second chamber (19).
8. The measuring device according to claim 7, characterized in that A second sealing member (17) is sandwiched between the second cover plate (15) and the box body (13).
9. The measuring device according to claim 8, characterized in that The second sealing member (17) is made of rubber.
10. The measuring device according to any one of claims 1 to 9, characterized in that: The number of the mounting holes (12) is two, the number of the test pieces (3) is two, the two test pieces (3) are respectively a gas flow meter and a gas pressure meter, the gas flow meter is capable of testing the gas flow rate in the second chamber (19), and the gas pressure meter is capable of testing the gas pressure in the second chamber (19).