Air tightness detection device for total static pressure sensor

Abstract

The utility model discloses an air tightness detection device for a total static pressure sensor, which relates to the technical field of aircrafts and comprises a fuming device used for producing visual smoke so as to visualize the leakage position of the total static pressure sensor to be detected; and one end of the detection tube is hermetically connected with the outlet of the smoke generating device, and the other end of the detection tube is hermetically connected with the detection port of the total static pressure sensor. The fuming device is in sealed connection with the to-be-detected total static pressure sensor through the detection pipe, the gas leakage position and the gas blow-by position of the total static pressure sensor are accurately judged through visual smoke, compared with an existing pressurization and pressure maintaining detection method, detection equipment such as a high-pressure gas source and a pressure sensor does not need to be arranged, detection operation is convenient and fast, cost is low, and detection efficiency is high. And the air tightness detection efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of aircraft technology, and more specifically, to an airtightness testing device for a total hydrostatic sensor. Background Technology

[0002] Total hydrostatic sensors are used to measure the total pressure and static pressure of an aircraft and are core components that ensure stable control and navigation of the aircraft.

[0003] Typically, total hydrostatic sensors are assembled from multiple parts. Gaps can easily exist between these parts after assembly, leading to air leakage or cross-contamination issues after prolonged use. This can cause abnormal airspeed detection and seriously affect flight safety. Therefore, a tightness test must be performed on the total hydrostatic sensor after assembly.

[0004] Currently, the airtightness testing of total static pressure sensors mostly adopts a pressure-holding test. This method requires introducing gas at a specified pressure into the total static pressure sensor under test, and then monitoring the pressure drop inside the sensor after shutting off the gas supply to determine whether there is a leak or gas leakage problem. The above testing method requires a lot of equipment, is complex and cumbersome to operate, and makes it difficult to accurately locate the leak or gas leakage location.

[0005] In summary, accurately locating leaks and cross-contamination points during airtightness testing is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide an airtightness detection device for a total static pressure sensor, which uses visualized smoke to accurately determine the location of leakage and cross-flow of air in the total static pressure sensor. The detection operation is convenient and low-cost, thus improving the efficiency of airtightness detection.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An airtightness testing device for a total hydrostatic sensor, comprising:

[0009] A smoke generator is used to produce visual smoke to visualize the location of a leak in a total hydrostatic sensor under test.

[0010] The detection tube has one end sealed to the outlet of the smoke generating device and the other end sealed to the detection port of the total hydrostatic sensor.

[0011] Preferably, the detection tube includes a dynamic pressure detection tube for threaded connection to the dynamic pressure port of the total hydrostatic sensor, a static pressure output detection tube for threaded connection to the static pressure output port of the total hydrostatic sensor, and a dynamic pressure output detection tube for threaded connection to the dynamic pressure output port of the total hydrostatic sensor.

[0012] Preferably, the detection tube further includes a detection main tube, and the dynamic pressure detection tube, the static pressure output detection tube, and the dynamic pressure output detection tube are all connected to the detection main tube. The end of the dynamic pressure detection tube that is closer to the detection main tube is provided with a first control valve for controlling the flow channel opening and closing, the end of the static pressure output detection tube that is closer to the detection main tube is provided with a second control valve for controlling the flow channel opening and closing, and the end of the dynamic pressure output detection tube that is closer to the detection main tube is provided with a third control valve for controlling the flow channel opening and closing.

[0013] Preferably, a first sealing ring is provided between the dynamic pressure detection tube and the dynamic pressure port, a second sealing ring is provided between the static pressure output detection tube and the static pressure output port, and a third sealing ring is provided between the dynamic pressure output detection tube and the dynamic pressure output port.

[0014] Preferably, the device also includes a testing platform, which is provided with at least two testing brackets for mounting the total hydrostatic sensor. When the total hydrostatic sensor is installed in place, the axis of the total hydrostatic sensor is parallel to the top surface of the testing platform.

[0015] Preferably, the detection bracket is slidably mounted on the top surface of the detection platform, and a locking member is provided between the detection bracket and the detection platform to fix the position of the detection bracket relative to the detection platform.

[0016] Preferably, the testing bracket includes a first sleeve and a second sleeve nested together. The top end of the first sleeve is provided with a mounting bracket for installing the total hydrostatic sensor, and the bottom end of the second sleeve is connected to the testing platform. One of the bottom of the first sleeve and the top of the second sleeve is provided with at least one first connecting hole, and the other is provided with a second connecting hole, so that the connecting pin can adjust the height of the testing bracket by changing the first connecting hole through which it passes.

[0017] Preferably, it further includes a rotary testing table for driving the testing bracket and the total hydrostatic sensor to rotate. The rotary testing table is rotatably disposed on the top surface of the testing platform, and the rotating shaft of the rotary testing table is connected to the output shaft of the rotary motor.

[0018] Preferably, it also includes an image monitoring module, which is used to acquire image information of the total hydrostatic sensor in real time.

[0019] Preferably, the image monitoring module includes a first camera and a second camera. The first camera is mounted directly below the total hydrostatic sensor via a mounting bracket, and the second camera is mounted directly above the total hydrostatic sensor via a mounting bracket.

[0020] The airtightness testing device for total static pressure sensors provided by this utility model connects a smoke generator to the total static pressure sensor under test via a detection tube in a sealed manner. It uses visual smoke to accurately determine the location of air leakage and cross-flow of the total static pressure sensor. Compared with the existing pressure holding test method, it does not require the setting of high-pressure gas source and pressure sensor and other detection equipment. The test operation is convenient and the cost is low, which improves the efficiency of airtightness testing. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a schematic diagram illustrating the detection principle of the airtightness testing device for a total hydrostatic pressure sensor provided by this utility model, which is connected to the dynamic pressure port.

[0023] Figure 2 This is a schematic diagram illustrating the detection principle of connecting the airtightness testing device for a total static pressure sensor to the static pressure output port.

[0024] Figures 1-2 middle:

[0025] 100 - Total static pressure sensor; 110 - Dynamic pressure port; 120 - Static pressure output port; 130 - Dynamic pressure output port; 10 - Smoke generator; 20 - Detection tube. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] The core of this invention is to provide an airtightness detection device for total static pressure sensors. It uses visualized smoke to accurately determine the location of leaks and cross-flows in the total static pressure sensor. The detection operation is convenient and low-cost, thus improving the efficiency of airtightness detection.

[0028] The airtightness testing device for a total hydrostatic sensor provided by this utility model includes:

[0029] Smoke generator 10 is used to generate visual smoke to visualize the location of a leak in the total hydrostatic sensor 100 to be detected;

[0030] The detection tube 20 has one end sealed to the outlet of the smoke generating device 10, and the other end sealed to the detection port of the total hydrostatic sensor 100.

[0031] It should be noted that the visual smoke here includes both white smoke of a certain concentration and colored smoke of a certain concentration.

[0032] The specific concentration and color of the visual smoke generated by the smoke generating device 10 shall be based on the standard that it can be effectively identified in actual testing. Effective identification here can be effective identification by visual inspection personnel or effective identification by image monitoring modules such as infrared cameras and webcams, and shall be based on the identification method of the actual airtightness testing device.

[0033] The smoke generating device 10 can be configured as a physical atomization smoke generating device, which uses physical methods such as heating, compression or ultrasound to convert the smoke generating liquid into tiny particles and form visible smoke, or it can be configured as a chemical reaction smoke generating device, which uses a chemical exothermic reaction to generate fixed or liquid smoke particles.

[0034] However, it should be noted that the visual smoke produced by the chemical reaction smoke generator may contain irritating gases. It is necessary to ensure the ventilation performance of the testing environment and avoid inhaling or skin contact with the visual smoke during testing. Alternatively, the airtightness test should be conducted in a sealed space, and the testing personnel should observe from outside the space to ensure the health of the testing personnel.

[0035] The smoke generating device 10 is connected to the detection ports of the total static pressure sensor 100, such as the dynamic pressure port 110, the static pressure output port 120, and the dynamic pressure output port 130, through the detection tube 20. In order to visualize the location of gas leakage and interference leakage at the pipeline connection, the two ends of the detection tube 20 are respectively sealed to the outlet of the smoke generating device 10 and the detection port of the total static pressure sensor 100.

[0036] The sealing connection can be specifically set as a threaded sealing connection, flange connection, compression fitting connection, etc. The specific connection method needs to be determined according to the structure and size of each detection port of the total hydrostatic sensor 100 and the outlet structure and size of the smoke generating device 10 in actual production, which will not be elaborated here.

[0037] When conducting an airtightness test, first place and fix the total static pressure sensor 100 horizontally. Connect the outlet of the smoke generator 10 to the dynamic pressure port 110 of the total static pressure sensor 100 using the detection tube 20. Then, control the smoke generator 10 to start working and observe the location of the visible smoke overflow. If the visible smoke overflows from the designated location, it indicates that there is no leakage or cross-flow problem. Conversely, if the visible smoke overflows from a location other than the designated location, it indicates that there is a leakage and / or cross-flow problem. The leak location can be accurately located based on the overflow location, and then repairs can be carried out.

[0038] Then, the detection tube 20 is connected sequentially to the static pressure output port 120 and the dynamic pressure output port 130 of the total static pressure sensor 100 to perform airtightness testing on the static pressure output port 120 and the dynamic pressure output port 130.

[0039] In this embodiment, the smoke generating device 10 is sealed to the total static pressure sensor 100 to be tested through the detection tube 20. The location of leakage and cross-flow of the total static pressure sensor 100 is accurately determined by visual smoke. Compared with the existing pressure holding detection method, it does not require the setting of high-pressure gas source and pressure sensor and other detection equipment. The detection operation is convenient and the cost is low, which improves the efficiency of air tightness detection.

[0040] Based on the above embodiments, considering that the structures and sizes of the detection ports of the total hydrostatic sensor 100 are different, the detection tube 20 can be provided to include a dynamic pressure detection tube for threaded connection with the dynamic pressure port 110 of the total hydrostatic sensor 100, a static pressure output detection tube for threaded connection with the static pressure output port 120 of the total hydrostatic sensor 100, and a dynamic pressure output detection tube for threaded connection with the dynamic pressure output port 130 of the total hydrostatic sensor 100.

[0041] The dynamic pressure detection tube, static pressure output detection tube and dynamic pressure output detection tube can be set to be independent of each other. When switching different detection ports, the detection tube 20 can be disassembled and assembled accordingly.

[0042] To simplify the testing process, the detection tube 20 can also include a detection main tube. The dynamic pressure detection tube, static pressure output detection tube, and dynamic pressure output detection tube are all connected to the detection main tube. The end of the dynamic pressure detection tube that is closer to the detection main tube is equipped with a first control valve for controlling the flow channel opening and closing. The end of the static pressure output detection tube that is closer to the detection main tube is equipped with a second control valve for controlling the flow channel opening and closing. The end of the dynamic pressure output detection tube that is closer to the detection main tube is equipped with a third control valve for controlling the flow channel opening and closing. By changing the opening and closing of each control valve, the connected detection tube 20 is changed, thereby switching the detection port connected to the smoke generating device 10.

[0043] Based on the above embodiments, in order to improve the sealing performance at the connection between the detection port and the detection tube 20, a first sealing ring can be provided between the dynamic pressure detection tube and the dynamic pressure port 110, a second sealing ring can be provided between the static pressure output detection tube and the static pressure output port 120, and a third sealing ring can be provided between the dynamic pressure output detection tube and the dynamic pressure output port 130.

[0044] The installation position of the sealing ring is related to the connection method between the detection port and the detection tube 29. When the detection port is provided with internal thread and the corresponding detection tube 20 is provided with external thread, a sealing step for abutting against the connection end of the detection port can be provided on the outer periphery of the outlet end of the detection tube 20. A sealing groove for installing the sealing ring is provided at the end of the sealing step that is relatively close to the detection port.

[0045] When the detection port has an external thread and the corresponding detection tube 20 has an internal thread, a limiting step can be provided on the outer periphery of the detection port to abut against the connection end of the detection tube 20. The end of the limiting step that is closer to the detection tube 20 has a sealing groove for installing a sealing ring.

[0046] The material of each sealing ring can be determined according to the sealing ring used in the assembly of the total hydrostatic sensor 100 in actual production, and the size can be determined according to the size of each detection port.

[0047] In this embodiment, a sealing ring is used to seal the gap between the detection port and the detection tube 20, which improves the sealing performance between the two and avoids leakage at the connection from affecting the airtightness test results.

[0048] Based on the above embodiments, the airtightness testing device also includes a testing platform. The testing platform is provided with at least two testing brackets for installing the total static pressure sensor 100. When the total static pressure sensor 100 is installed in place, the axis of the total static pressure sensor 100 is parallel to the top surface of the testing platform to facilitate the disassembly and assembly of the testing tube 20 and the testing port, as well as the observation of the leakage location.

[0049] The structure and dimensions of the testing bracket are determined based on the structure and dimensions of the total hydrostatic pressure sensor 100 to be tested in actual production. The testing bracket can be fixedly installed on the top surface of the testing platform, or it can be slidably installed on the top surface of the testing platform. A locking device is provided between the testing bracket and the testing platform to fix the position of the testing bracket relative to the testing platform. By changing the distance between the testing brackets, the airtightness testing requirements of total hydrostatic pressure sensors 100 with different axial dimensions can be met.

[0050] Preferably, considering the airtightness testing requirements of total hydrostatic sensors 100 with different radial dimensions, the testing bracket includes a first sleeve and a second sleeve nested together. The top end of the first sleeve is provided with a mounting bracket for mounting the total hydrostatic sensor 100, and the bottom end of the second sleeve is connected to the testing platform. One of the bottom of the first sleeve and the top of the second sleeve is provided with at least one first connecting hole, and the other is provided with a second connecting hole, so that the connecting pin can adjust the height of the testing bracket by changing the first connecting hole it passes through, thereby meeting the maintenance and installation requirements of total hydrostatic sensors 100 with different radial dimensions.

[0051] In this embodiment, the total static pressure sensor 100 to be tested is installed on the test platform, so that the position of the smoke generating device 10 is relatively fixed, avoiding the need to adjust the relative position of the smoke generating device 10 and the total static pressure sensor 100 before each air tightness test, which helps to simplify the air tightness test operation.

[0052] Please refer to Figure 1 and Figure 2 The detection ports of the total static pressure sensor 100 are located at both ends in the axial direction. When changing the detection ports connected to the detection tube 20, the smoke generating device 10 and the detection ports can be connected by detection tubes 20 of different lengths. Alternatively, the position of the total static pressure sensor 100 can be moved and the detection ports of the smoke generating device 10 can be connected by detection tubes 20 of the same length.

[0053] The testing platform can move the total static pressure sensor 100 by translation or by rotation. In order to reduce the size of the testing platform, the airtightness testing device is preferably provided to also include a rotating testing table for driving the testing bracket and the total static pressure sensor 100 to rotate. The rotating testing table is rotatably located on the top surface of the testing platform, and the rotating shaft of the rotating testing table is connected to the output shaft of the rotating motor.

[0054] Based on the above embodiments, the airtightness detection device also includes an image monitoring module. The image monitoring module is used to acquire image information of the total hydrostatic sensor 100 in real time, and to locate the leak location more accurately through the image monitoring module.

[0055] The image monitoring module may include a first camera and a second camera. The first camera is mounted directly below the total hydrostatic sensor 100 via a mounting bracket, and the second camera is mounted directly above the total hydrostatic sensor 100 via a mounting bracket, so as to realize all-round real-time detection of the total hydrostatic sensor 100.

[0056] Of course, the image monitoring module can also be set as an infrared camera, or as a laser particle counter, etc., to perform quantitative analysis by utilizing the interaction between the laser beam and smoke particles.

[0057] It should be noted that the first control valve, second control valve, and third control valve, first sealing ring, second sealing ring, and third sealing ring, first sleeve and second sleeve, and the first, second, and third in the first and second connecting holes mentioned in this application are only used to distinguish different positions and do not contain any distinction of order.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] The airtightness testing device for a total hydrostatic sensor provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A device for detecting the airtightness of a total hydrostatic sensor, characterized in that, include: A smoke generator (10) is used to generate visual smoke to visualize the location of a leak in the total hydrostatic sensor (100) to be detected; The detection tube (20) has one end sealed to the outlet of the smoke generating device (10) and the other end sealed to the detection port of the total hydrostatic sensor (100).

2. The airtightness testing device for a total hydrostatic sensor according to claim 1, characterized in that, The detection tube (20) includes a dynamic pressure detection tube for threaded connection to the dynamic pressure port (110) of the total static pressure sensor (100), a static pressure output detection tube for threaded connection to the static pressure output port (120) of the total static pressure sensor (100), and a dynamic pressure output detection tube for threaded connection to the dynamic pressure output port (130) of the total static pressure sensor (100).

3. The airtightness testing device for a total hydrostatic sensor according to claim 2, characterized in that, The detection tube (20) also includes a detection main tube. The dynamic pressure detection tube, the static pressure output detection tube and the dynamic pressure output detection tube are all connected to the detection main tube. The dynamic pressure detection tube is provided with a first control valve for controlling the flow channel opening and closing at one end relative to the detection main tube. The static pressure output detection tube is provided with a second control valve for controlling the flow channel opening and closing at one end relative to the detection main tube. The dynamic pressure output detection tube is provided with a third control valve for controlling the flow channel opening and closing at one end relative to the detection main tube.

4. The airtightness testing device for a total hydrostatic sensor according to claim 2, characterized in that, A first sealing ring is provided between the dynamic pressure detection tube and the dynamic pressure port (110), a second sealing ring is provided between the static pressure output detection tube and the static pressure output port (120), and a third sealing ring is provided between the dynamic pressure output detection tube and the dynamic pressure output port (130).

5. The airtightness testing device for a total hydrostatic sensor according to any one of claims 1-4, characterized in that, It also includes a testing platform, which is provided with at least two testing brackets for mounting the total hydrostatic sensor (100). When the total hydrostatic sensor (100) is installed in place, the axis of the total hydrostatic sensor (100) is parallel to the top surface of the testing platform.

6. The airtightness testing device for a total hydrostatic sensor according to claim 5, characterized in that, The detection bracket is slidably mounted on the top surface of the detection platform, and a locking component is provided between the detection bracket and the detection platform to fix the position of the detection bracket relative to the detection platform.

7. The airtightness testing device for a total hydrostatic sensor according to claim 5, characterized in that, The testing bracket includes a first sleeve and a second sleeve nested together. The top end of the first sleeve is provided with a mounting bracket for installing the total hydrostatic sensor (100). The bottom end of the second sleeve is connected to the testing platform. One of the bottom of the first sleeve and the top of the second sleeve is provided with at least one first connecting hole, and the other is provided with a second connecting hole, so that the connecting pin can adjust the height of the testing bracket by changing the first connecting hole through which it passes.

8. The airtightness testing device for a total hydrostatic sensor according to claim 5, characterized in that, It also includes a rotary testing table for driving the testing bracket and the total hydrostatic sensor (100) to rotate. The rotary testing table is rotatably disposed on the top surface of the testing platform, and the rotating shaft of the rotary testing table is connected to the output shaft of the rotary motor.

9. The airtightness testing device for a total hydrostatic sensor according to any one of claims 1-4, characterized in that, It also includes an image monitoring module, which is used to acquire image information of the total hydrostatic sensor (100) in real time.

10. The airtightness testing device for a total hydrostatic sensor according to claim 9, characterized in that, The image monitoring module includes a first camera and a second camera. The first camera is mounted directly below the total hydrostatic sensor (100) via a mounting bracket, and the second camera is mounted directly above the total hydrostatic sensor (100) via a mounting bracket.

Images