SU1381354A1 - Water steam leakage pickup - Google Patents

Abstract

The invention relates to a tester. The aim of the invention is to increase productivity by shortening the transient time, increasing the sensitivity and reliability of monitoring leaktightness by reducing inertia and creating an accumulation volume. The water vapor leakage sensor comprises a housing with registered 6 unit and indicator J4 placed on it and connected with each other and with electrodes separated by a dielectric layer of the sensitive element 2 forming the bottom of the reaction chamber 5 made in the form of a groove. In this case, the sensing element 2 can be provided with several electrodes placed vertically or horizontally, and also connected to the housing by means of a hinge 15. The leaktightness of the product by means of a sensor is carried out in both static and dynamic modes. The presence of a leak in the product is detected by the glow of the indicator 14. 3 CI f-ly, 7 ill.

Description

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The invention relates to test equipment, in particular to the monitoring of the tightness of hydraulic and vapor-gas systems in hard-to-reach places.

The aim of the invention is to increase productivity by providing a minimum transient time, increasing sensitivity by decreasing inertia and increasing reliability by creating an accumulation volume.

FIG. 1 shows the sensor, a general view; in fig. 2 is a view A of FIG. one; in fig. 3 - sensor with a horizontal arrangement of electrodes, side view; in fig. 4 - the same, with a vertical arrangement of electrodes, side view; in fig. 5 — multi-electrode reaction chamber, cross section; in fig. 6 - the same, with two electrodes, cross section; in fig. 7 is an electrical circuit for connecting a sensing element.

The water leakage sensor (Fig. 1) includes a housing 1, a sensing element 2, made in the form of electrodes 3 placed flush on the working surface of the dielectric layer 4, represented by a tube, a plate of a solid gas-insulating dielectric, - your electrodes 3. The reaction chamber 5 is made in the form of a groove, the bottom part of which is formed by the sensing element 2. The recording unit 6 is connected to the electrodes 3. If necessary, the sensor may contain additional electrodes 3 (Fig. 3 and 5), which can be p placed horizontally (Fig. 3) or vertically (Fig. 4) and connected to the recording unit 6 in the same way as the main electrodes 3, by means of flexible wires 7, pole 8, printed circuit board 9 connected to power supply 10, and actuated by a switch 11 with a button 12. A knob 13 associated with a recording unit b, controls its sensitivity, fixed by an indicator 14, made in the form of a LED. For the purpose of improving performance, the reaction chamber 5 can be connected to the housing 1 by means of a hinge 15 and a lever 16 (Fig. 1), which makes it possible to rotate the reaction chamber 5 by 180 ° and to perform a leak test in hard-to-reach areas.

The recording unit 6 and its associated elements are placed on the housing 1, which ensures that the inspection is carried out in a dynamic mode.

The sensing element 2 (Fig. 2) can be made of foil-clad fiberglass fiber 0.5-1.0 mm thick by cutting or etching a groove 0.1-0.3 mm wide and more over the entire thickness of the foil, thus forming two comb electrodes 3. The groove is filled with an electric layer 4, for example, epoxy glue, and the electrodes 3 are electrolytically covered with a protective metal layer,

for example, tin, zinc, nickel, chromium or silver, which ensures their corrosion resistance.

The sensing element 2 is connected to the indicator 14 (Fig. 7) through an amplifier with a current of the current transistor VTi-UTZ and a shunt resistor Ri. Potentiometer R2 is used to regulate the initial current through the indicator 14 in order to check the efficiency of the sensor and adjust the electrical circuit when there is a change in the relative humidity of the surrounding air. With the help of potentiometer R2, if necessary, you can change the sensitivity of the sensor to the tech. RI shunt resistor is designed to match the change in resistance of the sensitive element

 2 from the effect of a leak with a trigger threshold of indicator 14 and a corresponding increase in sensitivity to leak.

The sensor works as follows. Before starting the testing of the product’s integrity, it is necessary to adjust the sensor due to changes in atmospheric conditions, in particular, air humidity. The adjustment is carried out by turning the knob 13 of the registering unit 6 until the indicator 14 lights up and

0 by then slowly turning the knob 13 in the opposite direction until the indicator 14 turns off, thus setting the phase transition limit from the dark state to the indicator 14 light. Running the indicator 14 in the form of a diode 5 allows the sensor to work in the atmospheric humidity range O- 98%.

The sensor is ready to conduct a leak test. In the static contact mode, the role of tightness is carried out to determine local small leaks. For this, the tuned sensor is installed on the controlled surface area of the product, while the groove of the reaction chamber 5 forms an accumulation chamber

5 above the assumed leakage location, and the leakage vapor completely condenses on the sensing element 2. At a predetermined frequency, depending on the required sensitivity, the power supply 10 is connected for a short time using button 12.

0 When the indicator 14 lights up due to a film of electrodes 3 condensing the film, the presence of a leak in the product is recorded.

In the dynamic mode, sensors for leakage of water vapor detect coarse leaks. For this, the tuned sensor is installed on the controlled surface of the reaction chamber 5 and the sensor is moved so that the longitudinal axis of the chute coincides with its line above the product, which prevents condensate from accumulating on the sensitive element 2. The leak location is determined by two mutually perpendicular movements of the sensor, while movement must be performed smoothly and at low speed, which contributes to accurate scanning. The leak is recorded by performing the reaction chamber 5 as

actuation - the luminescence of the indicator 14, the co-open chute allows as much as possible due to condensation, to close the sensitive element 2 to the counter on the surface of the sensitive elementary surface of the product, to create that 2, which causes the film 5 to close the accumulation volume electrodes 3. After triggered by the medium, which increases the sensitivity of the indicator 14 terminal, the sensor is removed to the monitor, and the minimum time to be reached by the rear of the defective place or raised process due to free

evaporation of condensate from the surface of the sensing element 2 with the passage of air through the chute, which allows you to scan the controlled surface of the product at a speed of up to 100-200 mm / s, which increases the control performance. The proposed sensor maintains operability of fixing the moment of operation with the relative humidity of the air cooler 14. In this case, it is necessary to have a production rate of up to 98% and negative temperatures.

lead the sensor to readjustment in the places of the -20 ° С control. roll with poor natural ventilation,

Claims (1)

to eliminate the effect of increasing moisture - the formula of the invention in these places resulting from steam leakage. After passing through the zones with the next 20 1. The leakage sensor of water vapor, the humidity-compensated sensor of the re-adjusting housing with the open reaction chamber is under normal operating conditions. To control the angular connections of the unit in the form of two electrodes and a dielectric, preliminarily use a sensor from the primary layer that separates them, the recording electrodes 3, placed on the edge 25 of the block connected to the electrodes, of the sensitive element 2 (Fig. 6 ). distinguished by the fact that, for the purpose of higher, the proposed sensor for leakage of water or capacity, by providing steam, makes it possible to determine the minimum time of the transient process for the magnitude of the leak, both dynamically and in itself, to increase the sensitivity and by reducing the static mode of operation, since by increasing the inertia and increasing the DC of the security sensor by creating a volume of accumulation, the proportionality between the resistive chamber is made in the form of the desire element forehead, the bottom part of which is formed by passing through the indicator 14. For the measuring element, performed in rhenium, the leakage value of the sensor is preliminarily in the form of a solid gas-impermeable dielectric, graduated from control leaks and of the electric plate, and the electrodes are placed, emitting the dependence of the current of the indicator 14 from 35 on its working surface flush, the magnitude of the leak. For dynamic mode2. The sensor according to claim 1, wherein that it is equipped with additional electrodes placed and connected to the recording unit identical to the main one. 3. A sensor according to claim 1, characterized in that, in order to improve the operational characteristics, the reaction chamber of this operation is removed at a given speed of movement of the sensor. In the process of measuring an unknown leak, the speed of movement of the sensor should correspond to the graduated one, and the indicator current 14 is recorded by a recorder. To eliminate the effect of previous measurements on the recording unit 6, it is necessary to carry out measurements with an interval of at least 1.5-2.0 s. 40 Nena with body pivotally. 4. The sensor according to claim 1, characterized in that the recording unit is located on the housing. 40 Nena with body pivotally. 4. The sensor according to claim 1, characterized in that the recording unit is located on the housing. / J P L2 (rig. 3 Fig.4Fig. Editor E. Kopcha Order 838/37 Compiled by S. Malkevich Tehred I. VeresKorrektor M. Pojo Circulation 847 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4