CN111239337B - Oxygen-enriched air oxygen concentration detection structure for airborne separator - Google Patents

Abstract

The invention discloses an oxygen-enriched air oxygen concentration detection structure for an airborne separator, belonging to a gas oxygen concentration detection technology, and is characterized in that it comprises an airborne separator (2), a sampling pipeline (6), a pressure sensor (5), an oxygen partial pressure sensor (9), a one-way valve (7), a sealing gasket (3), a filtering and limiting flow component, and a locking screw ring (11); the invention proposes an oxygen-enriched air oxygen concentration detection structure for an airborne separator, which improves the system test accuracy, reliability and service life by filtering impurities in the oxygen-enriched air, limiting gas flow and reducing gas fluctuations.

Description

An oxygen-enriched air oxygen concentration detection structure for an airborne separator

technical field

The invention belongs to the gas oxygen concentration detection technology, and relates to an improvement of an oxygen-enriched air oxygen concentration detection structure for an airborne separator.

Background technique

Current airborne separators can generate oxygen-enriched air from the aircraft's own compressed air source over a very long period of time. It is thus possible to provide passengers with oxygen-enriched air not only during the descent of the aircraft but also during its temporary flight altitude. Such as: Chinese patent application CN1549785A (method and device for distributing oxygen-enriched air for aircraft passengers) announced that "the separator 2 includes an output line 8 and a line 10, wherein the nitrogen-enriched air flows out from the line 8, Oxygen-enriched air flows in line 10. Said line 10 is provided with a sensor 12 to monitor the oxygen concentration of the oxygen-enriched air flowing therethrough.", the disadvantages are: 1. When the aircraft descends between cruising altitude and temporary altitude A first portion of oxygen-enriched air is delivered to the passengers from a separate source 18, and from approaching the temporary altitude, at least during a substantially stable flight of the aircraft, an onboard separator 2 produces a second portion of the oxygen-enriched air delivered to the passengers. For part of the oxygen-enriched air, the sensor 12 only detects the oxygen concentration of the oxygen-enriched air of the separator 2, and does not detect the oxygen concentration of the oxygen-enriched air of the independent source 18. It can be seen that the frequency of use of the sensor 12 is relatively small, and the service life has not been fully verified; 2. The oxygen concentration detection structure disclosed in Chinese patent application CN1549785A describes that the oxygen-enriched air of the separator 2 flows in the pipeline 10, and the pipeline 10 is provided with a sensor 12 to monitor the oxygen concentration of the oxygen-enriched air flowing there. The disclosed structure Relatively simple; 3. The sensor 12 is affected by factors such as the cleanliness, pressure and flow of the test gas during the test. The structure disclosed in Chinese patent application CN1549785A is difficult to meet the requirements of reliability, service life and test accuracy.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose an oxygen-enriched air oxygen concentration detection structure for an airborne separator, which can improve the system test accuracy, reliability and use by filtering impurities in the oxygen-enriched air, restricting gas flow and reducing gas fluctuations. life.

The technical scheme of the present invention is: an oxygen-enriched air oxygen concentration detection structure for an airborne separator, which is characterized in that: it comprises an airborne separator 2, a sampling line 6, a pressure sensor 5, an oxygen partial pressure sensor 9, One-way valve 7, gasket 3, filter restrictor assembly, locking screw ring 11; the shape of sampling line 6 is a horizontally placed cylinder, the left end face of sampling line 6 is parallel to the right end face, and the left end face of sampling line 6 is parallel to the right end face. There is a stepped hole 6a horizontally penetrating the right end face in the center. The inner diameter of the left section of the stepped hole 6a is smaller than the inner diameter of the right section. There is an internal thread in the right section hole of the stepped hole 6a. The left end face of the sampling line 6 is separated from the airborne by the end face seal At this time, the left port of the step hole 6a of the sampling pipeline 6 is connected to the output port of the sampling gas of the airborne separator 2, and the airborne separator 2 is bleed from the aircraft engine; the gasket 3 is a non-metallic annular gasket, The inner hole of the gasket 3 is not smaller than the inner diameter of the left section of the stepped hole 6a, and the gasket 3 is located on the stepped end face of the stepped hole 6a; The outer shape is in the shape of a stepped shaft with a large left and a small right. The outer shell 1 of the filter block has a stepped center hole with a large left and a small right. The large diameter hole in the left section of the center hole is the installation hole of the filter block. The cylindrical filter block 4 is located in The above-mentioned filter block installation hole is kept in an interference fit, the left surface of the filter block 4 is not higher than the left port of the filter block installation hole, and the right segment hole of the stepped center hole of the filter block outer shell 1 constitutes the restrictor hole 1a. The inner diameter of the flow hole 1a is d=0.15mm, the flow restriction hole 1a is located in the shaft-1b of the right section of the filter block outer shell 1, the outer diameter of the left section of the filter block outer shell 1 is not larger than the outer diameter of the gasket 3, and the filter flow restriction assembly Located in the right section hole of the step hole 6a of the sampling line 6, on the right side of the gasket 3, the locking screw ring 11 is screwed into the threaded hole of the shaft two 6b of the right section of the sampling line 6, and the annular left end face of the locking screw ring 11 is pressed tightly. The stepped end face of the outer shell 1 of the filter block; there are two machining planes on the outer circumferential surface of the shaft two 6b of the right section of the sampling line 6, and there is a threaded hole in the center of the plane. The threaded hole and the stepped hole 6a of the sampling line 6 pass through. Relative to the tightened locking screw ring 11, it is located at the right position of the shaft two 6b of the right section of the sampling line 6, and the external threads of the sensing parts of the pressure sensor 5 and the oxygen partial pressure sensor 9 are respectively installed in the threaded holes and keep the end face sealed; the sampling line 6 The right end face is threadedly connected to the one-way valve 7 through the end face seal. At this time, the right port of the step hole 6a of the sampling line 6 is connected to the input port of the one-way valve 7, and the output port of the one-way valve 7 is connected to the passenger cabin.

The filtering precision of the filter block 4 is 200 meshes.

The advantages of the invention are: a structure for detecting the oxygen concentration of the oxygen-enriched air for the airborne separator is proposed, which can filter impurities in the oxygen-enriched air, limit the gas flow and reduce the gas fluctuation, thereby improving the system test accuracy and reliability. properties and service life.

Description of drawings

Fig. 1 is the structural principle block of the present invention.

Detailed ways

The present invention will be described in further detail below. Referring to Fig. 1, an oxygen-enriched air oxygen concentration detection structure for an airborne separator is characterized in that: it comprises an airborne separator 2, a sampling line 6, a pressure sensor 5, an oxygen partial pressure sensor 9, and a one-way valve 7. Gasket 3, filter restrictor assembly, locking screw ring 11; the shape of sampling line 6 is a horizontally placed cylinder, the left end face of sampling line 6 is parallel to the right end face, and there is a sampling line 6 in the center of the left end face The stepped hole 6a horizontally penetrates the right end face. The inner diameter of the left section of the stepped hole 6a is smaller than the inner diameter of the right section. There is an internal thread in the right section hole of the stepped hole 6a. , at this time, the left port of the step hole 6a of the sampling line 6 is connected to the output port of the sampling gas of the airborne separator 2, and the airborne separator 2 is bleed from the aircraft engine; the gasket 3 is a non-metallic annular gasket, and the gasket 3 The inner hole is not less than the inner diameter of the left section hole of the step hole 6a, and the sealing gasket 3 is located on the step end face of the step hole 6a; the filter current limiting assembly is composed of the filter block 4 and the filter block outer shell 1, and the outer shape of the filter block outer shell 1 is left The shape of the stepped shaft is the size of the large and the right. The outer shell 1 of the filter block has a stepped center hole with the large left and the right small. The large-diameter hole in the left section of the center hole is the installation hole of the filter block. The left surface of the filter block 4 is not higher than the left port of the filter block installation hole, and the right section hole of the stepped center hole of the filter block outer shell 1 constitutes the restrictor hole 1a. The restrictor hole 1a The inner diameter d=0.15mm, the restricting hole 1a is located in the shaft-1b of the right section of the outer casing 1 of the filter block, the outer diameter of the left section of the outer casing 1 of the filter block is not larger than the outer diameter of the gasket 3, and the filtering flow restricting component is located in the sampling line 6. In the right section hole of the step hole 6a, on the right side of the gasket 3, the locking screw ring 11 is screwed into the threaded hole of the second shaft 6b of the right section of the sampling line 6, and the annular left end face of the locking screw ring 11 is pressed against the filter block housing. The stepped end face of the body 1; there are two machining planes on the outer circumferential surface of the shaft 2 6b of the right section of the sampling pipeline 6, and there is a threaded hole in the center of the plane. The threaded hole and the stepped hole 6a of the sampling pipeline 6 pass through. The locking ring 11 is located at the right position of the shaft two 6b of the right section of the sampling line 6, and the external threads of the pressure sensor 5 and the sensing part of the oxygen partial pressure sensor 9 are respectively installed in the threaded holes and keep the end face sealed; the right end face of the sampling line 6 passes through The end face seal is threadedly connected to the one-way valve 7. At this time, the right port of the step hole 6a of the sampling line 6 is connected to the input port of the one-way valve 7, and the output port of the one-way valve 7 is connected to the passenger cabin.

The filtering precision of the filter block 4 is 200 meshes.

The working principle of the present invention is as follows: the sampling gas enters the filtering and restricting components through the sampling pipeline channel, and the impurities that may exist in the incoming gas are filtered by the filter block, so as to prevent the impurities from clogging the restricting holes or polluting the oxygen content of the sampling gas for analysis. pressure sensor, resulting in distortion or failure of the sensor output; the filtered gas flows through the test test to achieve the required flow rate after the restriction hole is deformed by duckbill pliers, and the required flow rate is output under the condition that the inlet pressure is set to 0.2MPag In the range of 0.3L/min ~ 0.5L/min, the filtered current-limited and regulated sample gas flows through the oxygen partial pressure sensor, the oxygen partial pressure sensor tests the oxygen partial pressure of the sampled gas, and the pressure sensor tests the sampled gas pressure. The oxygen concentration of the sampled gas is obtained, and through the duckbill pliers, the diameter of the restrictor hole can be changed to achieve the required flow rate, which reduces the processing difficulty of the restrictor hole. The filter and restrictor components are used to improve the filtration accuracy and pressure of the sampled gas. Fluctuations and flow fluctuations improve the measurement accuracy and service life of the oxygen partial pressure sensor and pressure sensor; the use of the one-way valve prevents the impact of cabin pressure fluctuations on the sampling gas pressure, and improves the test accuracy of the system; the test proves: the system The measurement accuracy is improved by more than 50%, and the sensor replacement frequency is reduced by half of the original.

In an embodiment of the present invention, the on-board separator 2, the pressure sensor 5, the one-way valve 7, and the oxygen partial pressure sensor 9 are all finished parts.

Claims (2)

1. an oxygen-enriched air oxygen concentration detection structure for an airborne separator, characterized in that: it comprises an airborne separator (2), a sampling line (6), a pressure sensor (5), an oxygen partial pressure sensor ( 9), one-way valve (7), gasket (3), filter restrictor assembly, locking screw ring (11); the shape of the sampling line (6) is a horizontally placed cylinder, and the left end of the sampling line (6) In the center of the left end face of the sampling pipeline (6), there is a stepped hole (6a) horizontally penetrating the right end face. The inner diameter of the left section of the stepped hole (6a) is smaller than the inner diameter of the right section. There is an internal thread in the right section hole of the sampling line (6), and the left end face of the sampling line (6) is threadedly connected to the onboard separator through the end face seal. At this time, the left port of the step hole (6a) of the sampling line (6) is connected to the onboard separator (2). The output port of the sampled gas is connected, and the onboard separator (2) bleeds air from the aircraft engine; the gasket (3) is a non-metallic annular gasket, and the inner hole of the gasket (3) is not smaller than the left section of the step hole (6a). The inner diameter of the hole, the gasket (3) is located on the stepped end face of the stepped hole (6a); the filter flow restricting assembly is composed of a filter block (4) and a filter block outer shell (1), and the filter block outer shell (1) has a left-hand shape. The outer casing of the filter block (1) has a stepped center hole with a large left and a small right, and the large diameter hole in the left section of the center hole is the installation hole of the filter block. The cylindrical filter block (4) It is located in the above-mentioned filter block installation hole and maintains an interference fit. The left surface of the filter block (4) is not higher than the left port of the filter block installation hole. Hole (1a), the inner diameter of the restricting hole (1a) is d=0.15mm, the restricting hole (1a) is located in the shaft one (1b) of the right section of the outer casing of the filter block (1), and the outer casing of the filter block (1) is on the left side The outer diameter of the sealing gasket (3) is not larger than the outer diameter of the sealing gasket (3). The filter and restrictor assembly is located in the right section hole of the step hole (6a) of the sampling line (6). On the right side of the sealing gasket (3), the locking screw ring (11) ) into the threaded hole of the second shaft (6b) of the right section of the sampling line (6), and the annular left end face of the locking screw ring (11) presses the stepped end face of the outer shell (1) of the filter block; There are two machining planes on the outer circumferential surface of the second shaft (6b) of the right section, and there is a threaded hole at the center of the plane. The ring (11) is located at the right position of the shaft two (6b) of the right section of the sampling line (6), and the external threads of the pressure sensor (5) and the sensing part of the oxygen partial pressure sensor (9) are respectively installed in the threaded holes to keep the end face sealed; The right end face of the sampling line (6) is threadedly connected to the one-way valve (7) through the end face seal. At this time, the right port of the step hole (6a) of the sampling line (6) is connected to the input port of the one-way valve (7), and the one-way valve ( 7) The output port is communicated with the passenger cabin. 2. The oxygen-enriched air oxygen concentration detection structure of the airborne separator according to claim 1, characterized in that: the filtering precision of the filter block (4) is 200 meshes.

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