Chemical oxygen generator shunt valve gas distribution effect detection device and method

Abstract

The present application relates to a kind of chemical oxygen generator shunt valve gas distribution effect detection device and method, belong to chemical oxygen generator technical field.The device includes shell, gas buffer tank, rotor flowmeter, flow controller and mass flowmeter;Shell is equipped with air inlet and exhaust hole, and is embedded with power switch, flow controller and two or more rotor flowmeters;Mass flowmeter and gas buffer tank are fixedly installed in shell interior;Gas source is sequentially connected with the air inlet of shell, mass flowmeter and gas buffer tank by gas pipe;The shunt valve to be tested is installed on the gas outlet of gas buffer tank, and its two or more outlets are respectively connected with rotor flowmeter one to one;The outlet of rotor flowmeter is communicated with exhaust hole;Power switch is electrically connected with flow controller;Flow controller is electrically connected with mass flowmeter, and the gas flow in mass flowmeter is controlled by adjusting flow controller;The device is simple in structure, safe in operation, and high in accuracy.

Description

Technical Field

[0001] This invention relates to a device and method for detecting the gas distribution effect of a diversion valve in a chemical oxygen generator, specifically to a device for detecting the gas distribution effect of a diversion valve in a chemical oxygen generator used in a civil aviation passenger oxygen system, belonging to the technical field of chemical oxygen generators. Background Technology

[0002] Passenger oxygen systems provide emergency oxygen to passengers in the event of cabin depressurization in civil aircraft, ensuring their safety. Chemical oxygen generators are a core component of these systems. With the increasing demands for self-sufficiency in domestically produced large aircraft, the need and call for the independent development of chemical oxygen generators for passenger oxygen systems are growing stronger.

[0003] Each chemical oxygen generator in a civil aviation passenger oxygen system typically provides emergency oxygen for 2-4 passengers. Since the generator has only one outlet, gas needs to be distributed to each passenger's oxygen mask via a distribution valve. The gas distribution effect of the distribution valve directly determines the oxygen supply to each mask, thus affecting the safety of each passenger. Therefore, the distribution valve has very stringent requirements for gas distribution. Currently, there are no domestic manufacturers of chemical oxygen generators used in the civil aviation sector, and there are no precedents for related testing equipment available for reference. While the evaluation of related products and equipment abroad is relatively mature, detailed testing methods are not publicly available. Summary of the Invention

[0004] In view of this, the present invention provides a device and method for detecting the gas distribution effect of a chemical oxygen generator diversion valve, which can be used to detect the gas distribution effect of a chemical oxygen generator diversion valve used in civil aviation passenger oxygen systems.

[0005] This invention is achieved through the following technical solution:

[0006] A device for detecting the gas distribution effect of a diversion valve in a chemical oxygen generator, the device comprising a housing, a gas buffer tank, a rotor flow meter, a flow controller, and a mass flow meter;

[0007] The housing is provided with an air inlet and an exhaust port, and is equipped with a power switch, a flow controller and two or more rotor flow meters; a mass flow meter and a gas buffer tank are fixedly installed inside the housing.

[0008] The gas source is connected in sequence to the air inlet, mass flow meter and gas buffer tank on the shell through the air pipe. The diverter valve under test is installed on the air outlet of the gas buffer tank. The two or more outlets of the diverter valve under test are respectively connected to two or more rotor flow meters. The outlet of the rotor flow meter is connected to the exhaust port.

[0009] The power switch is electrically connected with the flow controller; opening the power switch, the power supply provides power for the flow controller; the flow controller is electrically connected with the mass flow meter, and the gas flow into the mass flow meter is controlled by adjusting the flow controller.

[0010] Further, the number of the rotor flow meters is greater than or equal to the number of the outlet of the tested shunt valve; the flow controller, the rotor flow meter and the power switch are embedded on the front panel of the shell; the left side panel of the shell is a door-openable panel.

[0011] Further, the outer diameter of the gas inlet is φ6 or φ8, and the gas inlet protrudes 2-3 cm on the inner and outer surfaces of the side panel of the shell.

[0012] Further, the shell and the gas inlet are made of 304 stainless steel; and the gas pipe is a TPU hose.

[0013] A method for detecting the gas distribution effect of a chemical oxygen generator shunt valve, the method uses the device of the application, and comprises the following steps:

[0014] Step 1, firmly connecting the gas source with the gas inlet of the device through a gas pipe, installing the tested shunt valve on the gas outlet of the gas buffer tank, and connecting the two or more outlets of the tested shunt valve with the rotor flow meters one by one;

[0015] Step 2, adjusting the knob of the rotor flow meter to reach the maximum opening degree; opening the power switch, the flow controller and the mass flow meter;

[0016] Step 3, adjusting the gas source pressure to be stable at a set value V, then adjusting the knob of the flow controller to gradually reach a set value V0 of the gas flow into the mass flow meter from an initial value 0, reading the rotor flow meter values V1 and V2 of the tested shunt valve outlet after the reading of the mass flow meter is stable; the set value V0 is greater than the rotor flow meter values V1 and V2 and less than the set value V;

[0017] Step 4, changing the set value V0 of the mass flow meter, and reading the new rotor flow meter values of the tested shunt valve outlet respectively, repeating more than three times; judging the gas distribution effect of the shunt valve according to the rotor flow meter values, if the value difference of any two rotor flow meter values is not greater than 0.1 L / min, the tested shunt valve is qualified; otherwise, it is unqualified.

[0018] Beneficial effects:

[0019] (1) The application provides a chemical oxygen generator shunt valve gas distribution effect detection device, the device uses a gas buffer tank to simulate a real chemical oxygen generator, has the same gas outlet as the chemical oxygen generator, facilitates installation of a detected shunt valve for detection, solves the chemical oxygen generator shunt valve gas distribution effect detection specific implementation problem of the civil aviation passenger oxygen system, has a simple structure and accurate results.

[0020] (2) The application provides a chemical oxygen generator shunt valve gas distribution effect detection device, the left side of the shell is a door type panel, facilitating opening of the device for installation or replacement of a detected shunt valve; the rotor flowmeter, flow controller and power switch are embedded on the front panel of the shell, facilitating observation of the number and adjustment operation.

[0021] (3) The application provides a chemical oxygen generator shunt valve gas distribution effect detection device, the gas inlet is protruded by 2-3 cm on the inner and outer surfaces of the shell side plate, facilitating firm connection with a gas pipe; the shell and the gas inlet are made of 304 stainless steel, are firm and durable, and are high in safety; the gas pipe is a TPU hose, is soft and has good tensile strength, impact strength and high and low temperature resistance, and has a long service life.

[0022] (4) The application provides a chemical oxygen generator shunt valve gas distribution effect detection method, the method adopts the device, has simple steps, is safe to operate and high in accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the device of the application;

[0024] Figure 2 It is a schematic diagram of the top of the buffer tank and the shunt valve;

[0025] Figure 3 It is a schematic diagram of the principle of the device of the application;

[0026] Among them, 1 is a power switch, 2 is a gas inlet, 3 is a flow controller, 4 is a shell, 5 is an exhaust hole, 6 is a rotor flowmeter, 7 is a mass flowmeter, 8 is a gas buffer tank, and 9 is a detected shunt valve. DETAILED DESCRIPTION

[0027] The application will be described in detail below in combination with the drawings and examples.

[0028] Example 1

[0029] A device for detecting the gas distribution effect of a chemical oxygen generator shunt valve, as shown in Figure 1 Fig. 1, comprises a shell 4, a gas buffer tank 8, a rotor flowmeter 6, a flow controller 3 and a mass flowmeter 7.

[0030] The shell 4 is a cuboid structure, and is made of 304 stainless steel; the left side plate of the shell 4 is a door-openable panel, facilitating opening of the shell for installation or replacement of internal components; the right lower corner of the right side plate of the shell 1 is provided with an air inlet 1 with an outer diameter of or The air inlet 1 is made of 304 stainless steel, and protrudes by 2-3 cm on the inner and outer surfaces of the right side plate, facilitating connection with the air pipe; 3-4 rotor flowmeters 6, a flow controller 3 and a device power switch 1 are embedded on the front panel of the shell 4; the shell 4 is internally fixedly installed with a mass flowmeter 7 and a gas buffer tank 8 (not indicated on the drawing); Figure 1

[0031] As shown in Figure 2 , the gas buffer tank 8 simulates a real chemical oxygen generator, and has the same number of gas outlets as the chemical oxygen generator;

[0032] The gas source is selected according to actual needs and conditions, and can be a gas cylinder, a gas station or other different forms of gas source;

[0033] The gas source is connected to the inlet of the device air inlet 2 through an air pipe, and the outlet of the air inlet 2 is connected to the inlet of the mass flowmeter 7; the outlet of the mass flowmeter 7 is connected to the inlet of the gas buffer tank 8, and the gas outlet of the gas buffer tank 8 is installed with a test shunt valve 9, which has two or more outlets, and the two or more outlets are connected one-to-one with the same number of rotor flowmeters 6 (wherein the total number of rotor flowmeters 6 is greater than or equal to the number of outlets of the test shunt valve 9, and in this embodiment, the same number of rotor flowmeters 6 as the number of outlets of the test shunt valve 9 can be selected for one-to-one connection); the outlets of the rotor flowmeters 6 are in communication with the exhaust holes 5 provided on the shell 4;

[0034] The power switch is electrically connected with the flow controller 3; when the power switch is turned on, the power supply supplies power to the flow controller 3; the flow controller 3 is electrically connected with the mass flowmeter 7, and the gas flow entering the mass flowmeter 7 is adjusted through the flow controller 3; the range of the rotor flowmeter and the mass flowmeter 7 is determined according to the test shunt valve; the air pipe is a TPU hose.

[0035] Example 2

[0036] Example 2 uses the device described in Example 1, and a compressed air steel cylinder is used as the gas source; the test shunt valve 9 uses a 2-person type shunt valve to detect the gas distribution effect of the chemical oxygen generator 2-person type shunt valve. The detection method is as follows, as shown in Figure 3

[0037] ​​Step 1, firmly connect the pressure reducing valve of the compressed air cylinder with the air inlet 2 of the device through an air pipe, open the left door panel of the shell 4, and optionally connect two rotameters with two air outlets of the two-person type flow divider respectively; install the two-person type flow divider on the air outlet of the gas buffer tank 8, and close the left door panel of the shell 4;

[0038] Step 2, adjust the knob of the connected rotameter to the maximum opening; turn on the power switch 1 installed on the front panel of the device to supply power to the flow controller 3, and turn on the flow controller 3 to adjust the gas flow entering the mass flow meter 7 through the flow controller 3;

[0039] Step 3, open the pressure reducing valve switch on the compressed air cylinder, and slowly adjust the pressure of the pressure reducing valve to 60 psi; then adjust the knob of the flow controller 3 to gradually reach the set value V0 of the gas flow entering the mass flow meter 7 from the initial value 0; after the reading of the mass flow meter 7 stabilizes, read the readings V1 and V2 of the rotameters connected to the two outlets of the two-person type flow divider;

[0040] Step 4, change the set value V0 of the mass flow meter 7, and read the new readings of the rotameters connected to the outlet of the tested flow divider 9 respectively, repeat 4 times; according to the readings of the rotameters, judge the gas distribution effect of the flow divider, if the numerical difference between the readings of the two rotameters is not greater than 0.1 L / min, the tested flow divider 9 is qualified; otherwise, it is unqualified; see Table 1 for specific data;

[0041] Table 1 Data recording table of gas distribution effect of two-person type flow divider

[0042]

[0043] Through the above test steps, it can be known that the gas flow of each branch of the tested two-person type flow divider is almost completely the same, which indicates that the gas distribution of the flow divider is very uniform. The device of Example 1 and the detection method of Example 2 can complete the test requirements of detecting the gas distribution effect of the flow divider of the chemical oxygen generator, and solve the specific implementation problem of detecting the gas distribution effect of the flow divider of the chemical oxygen generator for civil aviation passenger oxygen system.

[0044] In summary, the above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A chemical oxygen generator flow splitter valve gas distribution effect detection device, characterized by: The device comprises a shell (4), a gas buffer tank (8), a rotor flowmeter (6), a flow controller (3) and a mass flowmeter (7); The shell (4) is provided with an air inlet (2) and an air outlet (5), and is embedded with a power switch (1), a flow controller (3) and two or more rotor flowmeters (6); the shell (4) is internally fixedly installed with a mass flowmeter (7) and a gas buffer tank (8); A gas source is connected to the air inlet (2), the mass flowmeter (7) and the gas buffer tank (8) of the shell (4) in sequence through an air pipe, a tested shunt valve (9) is installed on the gas outlet of the gas buffer tank (8), and two or more outlets of the tested shunt valve (9) are connected to two or more rotor flowmeters (6) in one-to-one correspondence; the outlet of the rotor flowmeter (6) is communicated with the air outlet (5); The power switch (1) is electrically connected with the flow controller (3); when the power switch is turned on, the power supply supplies power to the flow controller (3); the flow controller (3) is electrically connected with the mass flowmeter (7), and the gas flow into the mass flowmeter (7) is controlled by adjusting the flow controller (3); The number of the rotor flowmeters (6) is greater than or equal to the number of the outlets of the tested shunt valve (9); the flow controller (3), the rotor flowmeter (6) and the power switch (1) are embedded on the front panel of the shell (4); the left side panel of the shell (4) is a door-openable panel.

2. The device according to claim 1, wherein: The air inlet (2) protrudes 2-3 cm on the inner and outer surfaces of the side panel of the shell (4).

3. The device according to claim 1 or 2, characterized in that: The shell (4) and the air inlet (2) are made of 304 stainless steel; the air pipe is a TPU hose.

4. A method for detecting the gas distribution effect of a chemical oxygen generator shunt valve, wherein the method adopts the device of any one of claims 1-3 and comprises the following steps: Step 1, firmly connect a gas source to the air inlet (2) of the device through an air pipe, install a tested shunt valve (9) on the gas outlet of the gas buffer tank (8), and connect two or more outlets of the tested shunt valve (9) to rotor flowmeters (6) in one-to-one correspondence; Step 2, adjust the knobs of the rotor flowmeters to the maximum opening degree; turn on the power switch (1), the flow controller (3) and the mass flowmeter (7); Step 3, adjust the gas source pressure to a set value V, then adjust the knob of the flow controller (3) to gradually increase the gas flow into the mass flowmeter (7) from an initial value 0 to a set value V0, and after the reading of the mass flowmeter (7) is stable, read the readings V1 and V2 of the rotor flowmeters connected to the outlets of the tested shunt valve (9); the set value V0 is greater than the readings V1 and V2 of the rotor flowmeters and less than the set value V; Step 4, change the set value V0 of the mass flowmeter (7), and read the new readings of the rotor flowmeters connected to the outlets of the tested shunt valve (9) respectively, and repeat the above steps more than three times; according to the readings of the rotor flowmeters, the gas distribution effect of the shunt valve is determined; if the difference between the readings of any two rotor flowmeters is not greater than 0.1 L / min, the tested shunt valve (9) is qualified; otherwise, the tested shunt valve (9) is unqualified.

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