CN1195208C

CN1195208C - Leakage amount detector

Info

Publication number: CN1195208C
Application number: CN 01121554
Authority: CN
Inventors: 徐振泽; 王伦有; 傅肇宗; 应建忠; 陈志伟
Original assignee: ZHENHUA MACHINERY WORKS YONGJIA COUNTY
Current assignee: ZHENHUA MACHINERY WORKS YONGJIA COUNTY
Priority date: 2001-06-19
Filing date: 2001-06-19
Publication date: 2005-03-30
Anticipated expiration: 2021-06-19
Also published as: CN1323983A

Abstract

The present invention relates to a leakage amount detector for detecting pressed cavity bodies, such as valves, pump bodies, pipe fittings, etc., in the state of test pressure. The present invention comprises a sealing cover, an exhaust valve, a detector, a tapping valve, a signal processing and displaying device, a connecting pipe fitting, a cable, etc. The present invention utilizes sensing signals generated by the variation of a liquid level on an outlet side caused by the leakage of a tested piece to reflect the value of leakage amount. The present invention has the display function in various contents and forms, such as data, curves, etc., for instantaneous and accumulated leakage amount. The present invention is suitable for detecting the leakage amount of gas and liquid test media and can be applied for manufacturers of products of pressed cavity bodies, such as pumps, valves, pipe fittings, etc., detecting departments and investigating units to carry out the measurement of the index of the leakage amount and the mechanism analysis of the process of leakage.

Description

A kind of leakage amount detector

The present invention relates to a kind of pick-up unit, specifically a kind of pick-up unit that is applicable to the leakage rates of pressurized cavity under the test pressure state such as valve, the pump housing and pipe fitting.

At present, detection for the leakage rate in pressurized chambeies such as valve, still adopt quite original method, mainly contain two kinds of forms, the one, manually count dripping of record leakage fluid by the tester and count, be converted into a milliliter number by dripping number then, perhaps it is collected, measure with measuring cup, this method is in fact also infeasible when concrete operations, amasss in seal or examination surface because leakage fluid tends to soak, and because of leakage rate itself few, major part can not form the liquid droplet and fall, and collects difficulty in addition, certainly will cause big measuring error; The 2nd, come the observation chamber internal pressure to keep situation by tensimeter, differentiate the whether qualified of sealing property with operator's experience, the method is indirect, there is no quantitative basis simultaneously.For this reason, patent of invention " inleakage detector " (application number 97109841.7 by the Wang Lunyou application, publication number CN1172256A) a kind of quantitative detecting method has been proposed, this method is to leak the pressure breakdown that causes input end by test specimen, form differential pressure with additive vessel, produce transducing signal, thereby the size of reflection leakage rate, this method will guarantee the pipe system of the input end leakage phenomenon that do not have itself, otherwise measurement result will be counted, therefore, implement comparatively difficulty, so this invention fails to obtain to implement.In a word, the device that does not still have at present a kind of suitable these performance index of quantitative measurement.

Task of the present invention provides the quantitative measurement of a kind of energy by the test specimen leakage rate, is not subjected to the leakage contribution of pipe system own, and it is little to detect error, precision height, the leakage amount detector that Presentation Function is complete.

Leakage amount detector of the present invention comprises stifle, vent valve, detecting device, tapping valve, signal processes and displays device and connecting tube, cable etc.This device is connected on the endpiece that is subjected to test specimen, stifle with joined by the outlet of test specimen, the top has exhausr port, opened and closed by vent valve control, there is an outlet below of stifle, links to each other with the import of detecting device by pipeline, there is a leakage fluid dram below of detecting device, opened and closed by tapping valve control, the output signal of detecting device connects signal processes and displays device, and the detecting device top has the logical atmosphere of overflow vent.

The invention has the advantages that the electric signal that reflection leakage rate size can be provided or show quantitative data and curve, can realize multiple displaying contents and form.Seal degree to test pipe system itself does not have strict demand, and sensitivity, precision can be satisfied the requirement of standard.And the leakage rate of suitable gas, liquid two class test(ing) mediums detects.

Fig. 1 is the system architecture synoptic diagram of this leakage amount detector.

Fig. 2 is the structural representation of the pressure type liquid level sensor of this leakage amount detector.

Fig. 3 is the condenser type of this leakage amount detector or the structural representation of liquid level sensor.

Below in conjunction with accompanying drawing the present invention is described in further detail.

Among Fig. 1, the stifle 1 of leakage amount detector with joined by the outlet of test specimen, and the sealing that coincide mutually, vent valve 2 joins with the exhausr port of stifle 1 top, the below outlet and the import of detecting device 3 of stifle 1 are joined, and the import of the leakage fluid dram of detecting device 3 and tapping valve 4 is joined, and atmosphere is led in the outlet of tapping valve 4, the output signal of detecting device 3 connects signal processes and displays device 5, and the overflow vent of the top of detecting device 3 leads to atmosphere.

Detecting device 3 can adopt the pressure type liquid level sensor, also can adopt capacitance level transducer.

Among Fig. 2, detecting device 3 is pressure type liquid level sensors.Entrance point 6 joins with stifle 1, interface 11 is a leakage fluid dram, interface 10 is an overflow vent, be positioned at the top of liquid level tube 9, liquid level tube connects the upside of measuring chamber 7 for 9 times, and is communicated with it, liquid level tube 9 can be made into band scale transparent tube, so that the Direct observation liquid level is measured in the chamber 7 sensitive element 8 is housed, the electric signal that sensitive element 8 produces is exported around 12 by electricity.

Among Fig. 3, detecting device is a kind of capacitance level transducer.The entrance point 13 of measuring chamber 14 joins with stifle 1, and interface 20 be a leakage fluid dram, liquid level tube 15 with measure chamber 14 and be connected, be positioned at measurement 14 tops, chamber, overflow vent 19 is arranged at its top, liquid level tube 15 is made by conductive material, also can interior or outside surface plating conductive film layer.Electrode 16 skewers are gone in the liquid level tube 15, and are by fixture 18 that it is unsettled fixing, and electrode 16 connects cable 7 output capacitance signals respectively with liquid level tube 15 or its conductive film layer.

Signal processes and displays device 5 is handled conversion with the electric signal of detecting device, the standard electric signal of output reflection leakage rate size, and show.Signal processes and displays device 5 can adopt electronic instrument, also can adopt microcomputer, perhaps earlier by electronic instrument the output signal of detecting device 3 is transformed to the standard signal, carries out processes and displays by microcomputer again.The parameter that shows can comprise the numerical value of the instantaneous flow of leakage rate and semi-invariant or curve, qualification situation, definite value sender, detection time, worker's piece number, operation job number etc., also can be printed each parameter by peripherals.

Claims

1, a kind of leakage amount detector, it is characterized in that it comprises stifle, vent valve, detecting device, tapping valve, signal processes and displays device and connecting tube, cable etc., stifle (1) with joined by the outlet of test specimen, and the sealing that coincide mutually, vent valve (2) joins with the exhausr port of stifle (1) top, the below outlet and the import of detecting device (3) of stifle (1) are joined, the import of the leakage fluid dram of detecting device (3) and tapping valve (4) is joined, atmosphere is led in the outlet of tapping valve (4), the output signal of detecting device (3) connects signal processes and displays device (5), and the overflow vent of the top of detecting device (3) leads to atmosphere.

2, leakage amount detector according to claim 1, it is characterized in that described detecting device (3) is a kind of pressure type liquid level sensor, it comprises import, leakage fluid dram, measurement chamber, liquid level tube, overflow vent, sensitive element and cable etc., measure chamber (7) and have import (6) and leakage fluid dram (11), liquid level tube (9) is drawn from the top of measuring chamber (7), and be communicated with it, the top has overflow vent (10), sensitive element (8) is loaded on to be measured in the chamber (7), and the output signal of sensitive element (8) is connected to signal processes and displays device (5) by cable (12).

3, leakage amount detector according to claim 1, it is characterized in that described detecting device (3) is a kind of capacitance level transducer, it comprises import, leakage fluid dram, measure the chamber, liquid level tube, overflow vent, electrode, fixture and cable etc., measure chamber (14) and have import (13) and leakage fluid dram (20), liquid level tube (15) is drawn from the top of measuring chamber (14), and be communicated with it, liquid level tube (15) is made by conductive material, also can in or outer wall plating conductive film layer, electrode (16) skewer is gone in the liquid level tube (15), by fixture (18) that it is unsettled fixing, the electric capacity signal that liquid level tube (15) or its conductive film layer and electrode (16) constitute connects signal processes and displays device (5) by cable (17).