Device and method for testing opening pressure of ejector nozzle

Abstract

The invention belongs to the technical field of aviation detection, and provides a device and method for testing the opening pressure of an ejector nozzle, and the device comprises a case, an oxygen bottle, an oxygen switch, a pressure reducer, a four-way connector, a precision pressure gauge, a pressure release valve, a nozzle detection tool, a flowmeter, an exhaust valve, and a high-pressure hose. The oxygen bottle is externally arranged, is filled with high-pressure oxygen in advance and is used for simulating a high-pressure oxygen source on the machine; the interior of the case is used for accommodating all other parts, and all the parts are connected through high-pressure hoses; the upper panel of the case is provided with an air inlet nozzle, and the right case is provided with an air outlet nozzle and an exhaust nozzle. Wherein the inflating nozzle is used for introducing high-pressure oxygen from an oxygen bottle, and the air outlet nozzle is used for introducing the high-pressure oxygen to the front end of a valve of the ejector nozzle to be tested until the ejector nozzle is pushed open, so that an on-board oxygen system is replaced to carry out an ejector nozzle opening pressure test. According to the invention, whether the opening pressure of the ejector nozzle on the machine meets the use requirement can be conveniently and rapidly detected under the ground condition.

Description

Technical Field

[0001] The invention belongs to the field of aviation detection technology, and specifically relates to a testing device and a testing method for the opening pressure of an ejector nozzle, which are suitable for detecting the opening pressure of an ejector nozzle of an oxygen regulator on an aircraft. Background Art

[0002] The oxygen regulator on the aircraft can adjust the oxygen supply pressure, flow rate and oxygen content according to certain rules as the flight altitude changes, meet the physiological needs of human breathing and body surface pressurization, and is directly related to the safety of passengers during flight. It is an important component of the aircraft oxygen supply system. During regular inspection and maintenance, the opening pressure of the ejector nozzle of the oxygen regulator is often tested to check whether it meets the use requirements.

[0003] At present, the opening pressure of the ejector nozzle of the oxygen regulator on the aircraft can only be tested through on-board joint testing while the aircraft is in flight. The on-board joint testing requires repeated tests to pass the test and requires the cooperation of downstream process operators. This has the problems of high testing costs, long testing cycles, and the need for many people to participate. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a testing device for the opening pressure of an ejector nozzle. By removing the ejector nozzle valve assembly for separate testing and avoiding on-board joint testing, the ejector nozzle opening pressure of the oxygen regulator on the aircraft can be quickly and conveniently tested.

[0005] The technical solution provided by the present invention is:

[0006] The test device for the opening pressure of the ejector nozzle comprises a chassis, an oxygen cylinder, an oxygen switch, a pressure reducer, a four-way joint, a precision pressure gauge, a pressure relief valve, a nozzle detection tool, a flow meter, an exhaust valve and a high-pressure hose;

[0007] The oxygen cylinder is external and pre-filled with high-pressure oxygen to simulate the high-pressure oxygen source on board;

[0008] The nozzle detection tooling includes a tooling air inlet nozzle, a main body, a tooling air outlet nozzle and a fastening nut, which is used to clamp the ejector nozzle valve assembly to be tested;

[0009] The chassis is a rectangular parallelepiped, and is divided into two parts, a left chassis and a right chassis, wherein the left chassis is used to accommodate the oxygen switch, the pressure reducer, the four-way joint, the precision pressure gauge, the pressure relief valve, the flow meter and the exhaust valve, and the right chassis is used to accommodate the nozzle detection tooling; the left side of the upper panel of the chassis is provided with an observation window matching the precision pressure gauge and the flow meter, a mounting hole matching the oxygen switch, and an operating hole matching the pressure relief valve and the exhaust valve; the right side of the upper panel of the chassis is provided with an opening matching the right chassis, and the opening is provided with an independent transparent flip cover; the upper panel of the chassis is also provided with an air inlet nozzle; the left inner wall of the right chassis is provided with an air outlet nozzle and an exhaust nozzle; wherein the air inlet nozzle is used to introduce high-pressure oxygen from the oxygen cylinder, and the air outlet nozzle is used to lead the high-pressure oxygen from the nozzle detection tooling to the front end of the ejector nozzle valve to be tested until the ejector nozzle is pushed open, so as to replace the on-board oxygen system to perform the ejector nozzle opening pressure test;

[0010] The air inlet nozzle is located on one side inside the left chassis and is connected to the pressure reducer, and the oxygen switch is provided between the air inlet nozzle and the pressure reducer; the pressure reducer is respectively connected to the precision pressure gauge, the air outlet nozzle and the pressure relief valve through a four-way joint; the air outlet nozzle is located on one side outside the left chassis and is connected to the air inlet nozzle of the nozzle detection tooling located on the right chassis, and the exhaust nozzle is located on one side outside the left chassis and is connected to the air outlet nozzle of the nozzle detection tooling; the exhaust nozzle is located on one side inside the left chassis and is connected to the flow meter and the exhaust valve in sequence.

[0011] Furthermore, in the nozzle detection tooling: the main body is divided into two cylindrical sections, the first main body and the second main body, the first main body is located at the front end, and the second main body is located at the rear end; the diameter of the first main body is smaller than the diameter of the second main body; the rear end of the main body is provided with an installation cavity for the ejector nozzle valve assembly along the axial direction, and the installation cavity matches the size of the ejector nozzle valve assembly to be tested; the front end of the main body is provided with an airway that passes through the installation cavity along the axial direction; the front end of the first main body is provided with a threaded hole, and the tooling air inlet nozzle is tightly installed at the front end of the first main body through threads; the side of the second main body is provided with a connection with the installation cavity The threaded through hole is connected to the second main body, and the tooling air outlet nozzle is tightly installed on the side of the second main body through threads; the outer surface of the rear end of the second main body is provided with threads, which match the fastening nut; the front end of the fastening nut is a threaded hole, and the rear end is provided with a round hole, the diameter of the round hole matches the size of the ejector nozzle valve assembly to be tested, and the diameter of the round hole is smaller than the diameter of the threaded hole; when the operator installs the ejector nozzle valve assembly to be tested into the main body installation cavity, the fastening nut is inserted into the rear end of the ejector nozzle valve assembly to be tested, and the thread on the outer surface of the rear end of the second main body is screwed in until it is tightened, the ejector nozzle valve assembly to be tested can be fastened and clamped.

[0012] Furthermore, the nozzle detection tool is designed according to the size of the ejector nozzle valve assembly to be tested.

[0013] Furthermore, the components inside the chassis are connected via the high-pressure hose.

[0014] Furthermore, the chassis is no longer than 800 mm, no wider than 450 mm, and no higher than 350 mm.

[0015] Furthermore, the pressure relief valve and the exhaust valve are fixedly installed below the pressure relief valve and the exhaust valve operating holes on the upper panel of the chassis, ensuring that the operator can conveniently turn on and off the pressure relief valve and the exhaust valve with his fingers.

[0016] Furthermore, the oxygen switch is fixedly mounted on the upper panel of the chassis through a mounting hole provided on the upper panel of the chassis, thereby ensuring that an operator can conveniently operate the oxygen switch.

[0017] The specific method for testing the opening pressure of the ejector nozzle to be tested using the above-mentioned testing device is as follows:

[0018] Step 1: Fasten and clamp the ejector nozzle valve assembly to be tested in the nozzle testing tooling and place it in the right chassis;

[0019] Step 2: Connect the oxygen cylinder to the air inlet on the chassis, connect the side of the air outlet located outside the left chassis to the air inlet of the nozzle detection tooling located on the right chassis, and connect the side of the exhaust nozzle located outside the left chassis to the air outlet of the nozzle detection tooling located on the right chassis; cover the transparent flip cover of the right chassis;

[0020] Step 3: Open the oxygen switch and exhaust valve. Oxygen will slowly build up pressure through the pressure reducer. The precision pressure gauge reading will slowly rise. When the precision pressure gauge reading suddenly drops and a "breathing" sound is heard from the ejector nozzle valve assembly to be tested in the right chassis, record the precision pressure gauge reading and flow meter reading at that moment to complete the test. The precision pressure gauge reading at that moment is the opening pressure value of the ejector nozzle to be tested. Close the oxygen switch and exhaust valve.

[0021] The advantages of the present invention are as follows: the present invention is simple and reasonable in design; by removing the ejector nozzle valve assembly to be tested and fastening it through a special nozzle detection tool, high-pressure oxygen is externally introduced from the nozzle detection tool to the front end of the ejector nozzle valve to be tested until the ejector nozzle valve is pushed open, thereby completing the detection and avoiding on-board joint testing, thereby effectively reducing the test cost; under ground conditions, it is possible to quickly and conveniently detect whether the ejector nozzle opening pressure of the oxygen regulator meets the use requirements, thereby effectively reducing the workload of maintenance personnel and ensuring the maintenance quality of the aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a testing device for the opening pressure of an ejector nozzle according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the appearance of a test device for the opening pressure of an ejector nozzle according to an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of a nozzle detection tooling according to an embodiment of the present invention;

[0025] In the figure: 1-oxygen cylinder; 2-air inlet nozzle; 3-oxygen switch; 4-pressure reducer; 5-four-way joint; 6-precision pressure gauge; 7-pressure relief valve; 8-air outlet nozzle; 9-nozzle detection tooling; 91-tooling air inlet nozzle; 92-main body; 921-first main body; 922-second main body; 93-tooling air outlet nozzle; 94-fastening nut; 10-exhaust nozzle; 11-flow meter; 12-exhaust valve; 13-injector nozzle valve assembly to be tested; 14-chassis; 141-chassis upper panel; 142-transparent flip cover; 15-pressure relief valve and exhaust valve operating holes. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0027] The ejector nozzle opening pressure test device proposed by the present invention is used to test the ejector nozzle opening pressure of an oxygen regulator on a certain type of aircraft.

[0028] like Figures 1 to 3 As shown, a specific embodiment of a test device for the opening pressure of an ejector nozzle of the present invention comprises a chassis 14, an oxygen cylinder 1, an oxygen switch 3, a pressure reducer 4, a four-way joint 5, a precision pressure gauge 6, a pressure relief valve 7, a nozzle detection tool 9, a flow meter 11, an exhaust valve 12 and a high-pressure hose;

[0029] The oxygen cylinder 1 is external and pre-filled with high-pressure oxygen to simulate the high-pressure oxygen source on board;

[0030] The nozzle detection tool 9 is designed according to the size of the ejector nozzle valve assembly 13 to be tested, and includes a tool air inlet nozzle 91, a main body 92, a tool air outlet nozzle 93 and a fastening nut 94, and is used to clamp the ejector nozzle valve assembly 13 to be tested;

[0031] The main body 92 is divided into two cylindrical sections, a first main body 921 and a second main body 922. The first main body 921 is located at the front end, and the second main body 922 is located at the rear end. The diameter of the first main body 921 is smaller than that of the second main body 922. The rear end of the main body 92 is provided with an installation cavity for the ejector nozzle valve assembly 13 along the axial direction, and the installation cavity matches the size of the ejector nozzle valve assembly 13 to be tested. The front end of the main body 92 is provided with an airway that is connected to the installation cavity along the axial direction. The front end of the first main body 921 is provided with a threaded hole, and the tooling air inlet nozzle 91 is tightly installed on the front end of the first main body 921 through threads. The side of the second main body 922 is provided with a Threaded through hole, the tooling air outlet nozzle 93 is tightly installed on the side of the second main body 922 through threads; the outer surface of the rear end of the second main body 922 is provided with threads, which match the fastening nut 94; the front end of the fastening nut 94 is a threaded hole, and the rear end is provided with a round hole, the diameter of the round hole matches the size of the ejector nozzle valve assembly 13 to be tested, and the diameter of the round hole is smaller than the diameter of the threaded hole; when the operator installs the ejector nozzle valve assembly 13 to be tested into the installation cavity of the main body 92, the fastening nut 94 is inserted into the rear end of the ejector nozzle valve assembly 13 to be tested, and the thread on the outer surface of the rear end of the second main body 922 is screwed in, and the ejector nozzle valve assembly 13 to be tested can be fastened and clamped.

[0032] The chassis 14 is a rectangular parallelepiped, and is divided into a left chassis and a right chassis. The left chassis is used to accommodate the oxygen switch 3, the pressure reducer 4, the four-way joint 5, the precision pressure gauge 6, the pressure relief valve 7, the flow meter 11 and the exhaust valve 12, and the right chassis is used to accommodate the nozzle detection tool 9; the left side of the upper panel 141 of the chassis 14 is provided with an observation window for matching the precision pressure gauge 6 and the flow meter 11, a mounting hole for matching the oxygen switch 3, and an operating hole 1 for matching the pressure relief valve 7 and the exhaust valve 12. 5; an opening matching the right side chassis is provided on the right side of the upper panel 141 of the chassis 14, and the opening is provided with an independent transparent flip cover 142; an air inlet nozzle 2 is also provided on the upper panel 141 of the chassis; an air outlet nozzle 8 and an exhaust nozzle 10 are provided on the left inner wall of the right side chassis; the air inlet nozzle 2 is used to introduce high-pressure oxygen from the oxygen cylinder 1, and the air outlet nozzle 8 is used to lead the high-pressure oxygen from the nozzle detection tooling 9 to the front end of the ejector nozzle valve 13 to be tested until the ejector nozzle is pushed open, so as to replace the on-board oxygen system to perform the ejector nozzle opening pressure test;

[0033] The air inlet nozzle 2 is located on a side inside the left chassis and is connected to the pressure reducer 4, and the oxygen switch 3 is provided between the air inlet nozzle 2 and the pressure reducer 4; the pressure reducer 4 is respectively connected to the precision pressure gauge 6, the air outlet nozzle 8 and the pressure relief valve 7 through a four-way joint 5; the air outlet nozzle 8 is located on a side outside the left chassis and is connected to the air inlet nozzle 91 of the nozzle detection tooling 9 located on the right chassis, and the exhaust nozzle 10 is located on a side outside the left chassis and is connected to the air outlet nozzle 93 of the nozzle detection tooling 9; the exhaust nozzle 10 is located on a side inside the left chassis and is connected to the flow meter 11 and the exhaust valve 12 in sequence.

[0034] In this embodiment, the components inside the chassis 14 are connected via the high-pressure hose.

[0035] In this embodiment, the chassis is 800 mm long, 450 mm wide, and 350 mm high.

[0036] In this embodiment, the pressure relief valve 7 and the exhaust valve 12 are fixedly installed below the pressure relief valve and exhaust valve operating holes 15 of the upper panel 141 of the chassis, ensuring that the operator can conveniently turn on and off the pressure relief valve 7 and the exhaust valve 12 with his fingers.

[0037] In this embodiment, the oxygen switch 3 is fixedly mounted on the upper panel of the chassis through the mounting holes provided on the upper panel 141 of the chassis, so that the operator can conveniently operate the oxygen switch 3 .

[0038] The specific method for detecting the opening pressure of the ejector nozzle to be tested removed from a certain type of aircraft using the above-mentioned test device is as follows:

[0039] Step 1: Fasten and clamp the ejector nozzle valve assembly 13 to be tested in the nozzle testing tool 9 and put it into the right side chassis;

[0040] Step 2: Connect the oxygen cylinder 1 to the air inlet nozzle 2 on the chassis 14, connect the side of the air outlet nozzle 8 located outside the left chassis to the air inlet nozzle 91 of the nozzle detection tooling 9 located on the right chassis, and connect the side of the exhaust nozzle 10 located outside the left chassis to the air outlet nozzle 93 of the nozzle detection tooling 9 located on the right chassis; cover the transparent flip cover 142 of the right chassis;

[0041] Step 3: Open the oxygen switch 3 and the exhaust valve 12. The oxygen slowly builds up pressure through the pressure reducer 4. The reading of the precision pressure gauge 6 slowly rises. When the reading of the precision pressure gauge 6 suddenly drops and a "breathing" sound is heard from the ejector nozzle valve assembly 13 to be tested in the right chassis, record the instantaneous reading of the precision pressure gauge 6 and the reading of the flow meter 11 to complete the test. The instantaneous reading of the precision pressure gauge 6 is the opening pressure value of the ejector nozzle to be tested. Close the oxygen switch 3 and the exhaust valve 12.

[0042] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. A device for testing the opening pressure of an ejector nozzle, characterized in that: Including chassis, oxygen cylinder, oxygen switch, pressure reducer, four-way joint, precision pressure gauge, pressure relief valve, nozzle detection tooling, flow meter, exhaust valve and high-pressure hose; The oxygen cylinder is external and pre-filled with high-pressure oxygen to simulate the high-pressure oxygen source on board; The nozzle detection tooling includes a tooling air inlet nozzle, a main body, a tooling air outlet nozzle and a fastening nut, which is used to clamp the ejector nozzle valve assembly to be tested; The chassis is a rectangular parallelepiped, and is divided into a left chassis and a right chassis. The left chassis is used to accommodate the oxygen switch, the pressure reducer, the four-way joint, the precision pressure gauge, the pressure relief valve, the flow meter and the exhaust valve, and the right chassis is used to accommodate the nozzle detection tooling; the left side of the upper panel of the chassis is provided with an observation window for matching the precision pressure gauge and the flow meter, a mounting hole for matching the oxygen switch, and an operating hole for matching the pressure relief valve and the exhaust valve; the right side of the upper panel of the chassis is provided with an opening matching the right chassis, and the opening is provided with an independent transparent flip cover; the upper panel of the chassis is also provided with an air inlet nozzle; the left inner wall of the right chassis is provided with an air outlet nozzle and an exhaust nozzle; The air inlet nozzle is located on one side inside the left chassis and is connected to the pressure reducer, and the oxygen switch is provided between the air inlet nozzle and the pressure reducer; the pressure reducer is respectively connected to the precision pressure gauge, the air outlet nozzle and the pressure relief valve through a four-way joint; the air outlet nozzle is located on one side outside the left chassis and is connected to the air inlet nozzle of the nozzle detection tooling located on the right chassis, and the exhaust nozzle is located on one side outside the left chassis and is connected to the air outlet nozzle of the nozzle detection tooling; the exhaust nozzle is located on one side inside the left chassis and is connected to the flow meter and the exhaust valve in sequence.

2. The device for testing the opening pressure of an ejector nozzle according to claim 1, characterized in that: The nozzle detection tooling comprises a tooling air inlet nozzle, a main body, a tooling air outlet nozzle and a fastening nut; the main body is divided into two cylindrical sections, a first main body and a second main body, the first main body is located at the front end, and the second main body is located at the rear end; the diameter of the first main body is smaller than the diameter of the second main body; the rear end of the main body is provided with an installation cavity of the ejector nozzle valve assembly axially, and the installation cavity matches the size of the ejector nozzle valve assembly to be tested; the front end of the main body is provided with an air passage that passes through the installation cavity axially; the front end of the first main body is provided with a threaded hole, and the tooling air inlet nozzle is tightly installed on the front end of the first main body through threads; the side of the second main body A threaded through hole connected to the installation cavity is provided, and the tooling air outlet nozzle is tightly installed on the side of the second main body through threads; the outer surface of the rear end of the second main body is provided with threads, which match the fastening nut; the front end of the fastening nut is a threaded hole, and the rear end is provided with a round hole, the diameter of the round hole matches the size of the ejector nozzle valve assembly to be tested, and the diameter of the round hole is smaller than the diameter of the threaded hole; when the operator installs the ejector nozzle valve assembly to be tested into the main body installation cavity, the fastening nut is inserted into the rear end of the ejector nozzle valve assembly to be tested, and the thread on the outer surface of the rear end of the second main body is screwed in until it is tightened, so that the ejector nozzle valve assembly to be tested can be fastened and clamped.

3. The device for testing the opening pressure of an ejector nozzle according to claim 2, characterized in that: The nozzle detection tool is designed according to the size of the ejector nozzle valve assembly to be tested.

4. The device for testing the opening pressure of an ejector nozzle according to claim 1, characterized in that: The components inside the chassis are connected via the high-pressure hose.

5. The device for testing the opening pressure of an ejector nozzle according to claim 1, characterized in that: The chassis is no longer than 800 mm, no wider than 450 mm, and no higher than 350 mm.

6. The device for testing the opening pressure of an ejector nozzle according to claim 1, characterized in that: The pressure relief valve and the exhaust valve are fixedly installed below the pressure relief valve and the exhaust valve operating holes on the upper panel of the chassis, ensuring that the operator can conveniently turn on and off the pressure relief valve and the exhaust valve with his fingers.

7. The device for testing the opening pressure of an ejector nozzle according to claim 1, characterized in that: The oxygen switch is fixedly mounted on the upper panel of the chassis through a mounting hole provided on the upper panel of the chassis, ensuring that an operator can conveniently operate the oxygen switch.

8. The specific method for testing the opening pressure of the ejector nozzle to be tested using the above-mentioned testing device is as follows: Step 1: Fasten and clamp the ejector nozzle valve assembly to be tested in the nozzle testing tooling and place it in the right chassis; Step 2: Connect the oxygen cylinder to the air inlet on the chassis, connect the side of the air outlet located outside the left chassis to the air inlet of the nozzle detection tooling located on the right chassis, and connect the side of the exhaust nozzle located outside the left chassis to the air outlet of the nozzle detection tooling located on the right chassis; cover the transparent flip cover of the right chassis; Step 3: Open the oxygen switch and exhaust valve. Oxygen slowly builds up pressure through the pressure reducer. The precision pressure gauge reading slowly rises. When the precision pressure gauge reading suddenly drops and a "breathing" sound is heard from the ejector nozzle valve assembly to be tested in the right chassis, record the precision pressure gauge reading and flow meter reading at that moment. The test is completed. The precision pressure gauge reading at that moment is the opening pressure value of the ejector nozzle to be tested. Close the oxygen switch and exhaust valve.

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