CN203030158U

CN203030158U - Hydrogen filter for detecting tiny leakage

Info

Publication number: CN203030158U
Application number: CN 201220738475
Authority: CN
Inventors: 艾子蔚; 刘德亮; 张伟明; 姜海洋; 张庆辉; 赵超越
Original assignee: BOYI (TIANJIN) PNEUMATIC TECHNOLOGY INST Co Ltd
Current assignee: Boyi Tianjin Pneumatic Technology Institute Co ltd
Priority date: 2012-12-27
Filing date: 2012-12-27
Publication date: 2013-07-03
Anticipated expiration: 2022-12-27

Abstract

A hydrogen filter for detecting tiny leakage comprises a body, a palladium alloy pipe, a heating core, a temperature sensor, a heating core cable and a temperature sensor cable. The body is provided with a cylindrical inner cavity, a tracer gas inlet passage and a filtered residual gas outlet passage are arranged at two ends of the body respectively, a hydrogen outlet and a cable port are arranged on the wall of the body, the hydrogen outlet is connected with an extraction pump and delivers extracted hydrogen to a nitrogen-hydrogen leakage detector for detection, the palladium alloy pipe is positioned in the inner cavity of the body, two ends of the palladium alloy pipe are hermetically connected with two ends of the inner cavity to form an annular vacuum cavity, the heating core is parallelly arranged at the center of the palladium alloy pipe, the temperature sensor is arranged in the heating core, and the heating core cable and the temperature sensor cable are led out from the cable port and are sealed with the body through a sealing block. The hydrogen filter has the advantages that the hydrogen filter is simple in structure and easy to operate, the hydrogen is separated from sampled gas and concentrated by the palladium alloy pipe, and accordingly, leakage detecting sensitivity and accuracy can be greatly improved.

Description

A kind of hydrogen filter for the minute leakage detection

Technical field

The utility model relates to minute leakage and detects, particularly a kind of hydrogen filter for the minute leakage detection.

Background technology:

At present, the minute leakage in a lot of industries detects generally uses helium mass spectrometer leak detector, with the search gas of helium as leak detection.Owing to reasons such as the price of helium rise steadily, begin to adopt nitrogen hydrogen leak detector in some industries, effectively reduce the cost that minute leakage detects.

Hydrogen gas sensor is equipped with in nitrogen hydrogen leak detector inside, generally uses the gaseous mixture of nitrogen of 5% hydrogen and 95% as search gas.When using nitrogen hydrogen leak detector to detect, at first the search gas of certain pressure will be charged in the measured object internal cavities, then near the gas the outside leakage point of measured object is sampled and be delivered to nitrogen hydrogen leak detector, carry out leak detection by the variation of measuring density of hydrogen in the sample gas.Generally, also can be mixed with the background gas that exists in the sampling environment in the sample gas, background gas not only can cause density of hydrogen further to reduce, and some composition wherein also can influence the accuracy that density of hydrogen is measured.At this problem, domestic and international existing nitrogen hydrogen leak detector all fails to provide effective solution, has directly influenced sensitivity and the degree of accuracy of nitrogen hydrogen leak detector leak detection.

The utility model content

The purpose of this utility model is at the problems referred to above, a kind of hydrogen filter for the minute leakage detection is provided, this filter is separated hydrogen by the palldium alloy pipe from sample gas, other gas that influences the density of hydrogen measurement is filtered out, guarantee to have only hydrogen can enter leak detector in the sample gas, thereby effectively reduce environmental exact details gas to the influence of leak detection; Simultaneously, hydrogen after filtering can be concentrated, thereby significantly improve sensitivity and the degree of accuracy that minute leakage detects.

The technical solution of the utility model:

A kind of hydrogen filter for the minute leakage detection, comprise body, palldium alloy pipe, heating core, temperature sensor, heating core cable and temperature sensor cable, body is airtight tubular structure, body is provided with the cylinder type inner chamber, the body two ends are respectively equipped with hydrogen nitrogen mixing spike gas intake channel and filter back residual gas exit passageway, be respectively equipped with hydrogen outlet and cable port on the body wall, hydrogen outlet is connected with aspiration pump by pipeline and the hydrogen of extracting out is delivered to nitrogen hydrogen leak detector by pipeline detect; The palldium alloy pipe is positioned at device cavity, and the two ends of palldium alloy pipe and inner chamber sealed at both ends is connected and forms the ring vaccum chamber between palldium alloy pipe and inner chamber, and hydrogen outlet is drawn in vacuum chamber; Heating core is set in parallel in the palldium alloy tube hub, is provided with temperature sensor in the heating core and fixes with filtering back residual gas exit passageway by temperature sensor, and heating core cable and temperature sensor cable are drawn and sealed by sealing block and body from cable port.

Operation principle of the present utility model:

The utility model is to adopt the palldium alloy pipe that hydrogen is separated from sample gas, makes that the gas outside the dehydrogenation all is filtered in the sample gas, has only hydrogen can enter nitrogen hydrogen leak detector, thereby effectively reduces the influence of other gas to detecting in the test environment; Simultaneously, hydrogen after filtering can be concentrated, thereby significantly improve sensitivity and the degree of accuracy that minute leakage detects.

The utility model has the advantages that: simple in structure, the easy operating of this hydrogen filter, by the palldium alloy pipe hydrogen is separated from sample gas and concentrated, nitrogen hydrogen leak detector can be effectively reduced to the restrictive condition of test environment, sensitivity and the degree of accuracy of leak detection can be significantly improved.

Description of drawings

Accompanying drawing is this hydrogen filter structural representation.

Among the figure: 1. hydrogen nitrogen mixing spike gas intake channel 2. bodies 3. palldium alloy pipes 4. heating cores 5. temperature sensors 6. hydrogen outlets 7. heating core cables 8. temperature sensor cables 9. sealing blocks 10. filter back residual gas exit passageway 11. vacuum chambers 12. cable port

The specific embodiment

Embodiment:

A kind of hydrogen filter for the minute leakage detection, comprise body 2, palldium alloy pipe 3, heating core 4, temperature sensor 5, heating core cable 7 and temperature sensor cable 8, body 2 is airtight tubular structure, body 2 is provided with the cylinder type inner chamber, body 2 two ends are respectively equipped with hydrogen nitrogen mixing spike gas intake channel 1 and filter back residual gas exit passageway 10, be respectively equipped with hydrogen outlet 6 and cable port 12 on body 2 walls, hydrogen outlet 6 is connected with aspiration pump by pipeline and the hydrogen of extracting out is delivered to nitrogen hydrogen leak detector by pipeline detect; Palldium alloy pipe 3 is positioned at body 2 inner chambers, and the two ends of palldium alloy pipe 3 and inner chamber sealed at both ends is connected and forms ring vaccum chamber 11 between palldium alloy pipe 3 and inner chamber, and hydrogen outlet 6 is drawn in vacuum chamber 11; Heating core 4 is set in parallel in palldium alloy pipe 3 centers, be provided with temperature sensor 5 and fixing with filtration back residual gas exit passageway 10 by temperature sensor 5 in the heating core 4, heating core cable 7 and temperature sensor cable 8 are drawn and are sealed by sealing block 9 and body 2 from cable port 12.

Pure palladium metal can be filtered hydrogen under 300-500 ℃, can not filter other any gas simultaneously.Hydrogen filter in the utility model utilizes this principle to obtain exactly, by heating palldium alloy pipe, simultaneously palldium alloy pipe outboard chambers is vacuumized, and hydrogen is separated the back release from vacuum chamber with other gas.

The course of work of this embodiment:

At first charge into 5% hydrogen of certain pressure and the mixing spike gas of 95% nitrogen in the internal cavities with measured object, hydrogen nitrogen mixing spike gas intake channel 1 is connected to the position that measured object need be hunted leak by pipeline, filter back residual gas exit passageway 10 at hydrogen simultaneously and connect a gas extraction pump, to keep conditions of certain gas flow.Switch on by 7 pairs of heating cores 4 of heating core cable then, by the temperature of temperature sensor cable 8 reading temperature sensors 5, keep constant by the control circuit holding temperature simultaneously.The hydrogen outlet 6 of hydrogen filter is connected a vavuum pump by pipeline, the vacuum chamber 11 of hydrogen filter is carried out vacuum drawn, the gas that extracts is delivered to nitrogen hydrogen leak detector by pipeline detect.

When gas leaks from measured object, must be to comprise certain density hydrogen and Air mixing gas.This mist enters palldium alloy pipe 3 by hydrogen nitrogen mixing spike gas intake channel 1.Because palldium alloy pipe 3 is in the condition of high temperature under heating core 4 "on" positions.Simultaneously again because vacuum chamber 11 is in vacuum state, at this moment the hydrogen in the mist of palldium alloy pipe 3 inside will enter vacuum chamber 11 by palldium alloy pipe 3, hydrogen enters nitrogen hydrogen leak detector by hydrogen outlet 6 and detects then, calculates leakage rate by nitrogen hydrogen leak detector.Gas after all the other filter is discharged from filtering back residual gas exit passageway 10.

Claims

1. one kind is used for the hydrogen filter that minute leakage detects, it is characterized in that: comprise body, palldium alloy pipe, heating core, temperature sensor, heating core cable and temperature sensor cable, body is airtight tubular structure, body is provided with the cylinder type inner chamber, the body two ends are respectively equipped with hydrogen nitrogen mixing spike gas intake channel and filter back residual gas exit passageway, be respectively equipped with hydrogen outlet and cable port on the body wall, hydrogen outlet is connected with aspiration pump by pipeline and the hydrogen of extracting out is delivered to nitrogen hydrogen leak detector by pipeline detect; The palldium alloy pipe is positioned at device cavity, and the two ends of palldium alloy pipe and inner chamber sealed at both ends is connected and forms the ring vaccum chamber between palldium alloy pipe and inner chamber, and hydrogen outlet is drawn in vacuum chamber; Heating core is set in parallel in the palldium alloy tube hub, is provided with temperature sensor in the heating core and fixes with filtering back residual gas exit passageway by temperature sensor, and heating core cable and temperature sensor cable are drawn and sealed by sealing block and body from cable port.