SU815544A1 - Device for testing articles for fluid-tightness - Google Patents

Description

The invention relates to test equipment, and in particular to leak tests.

A known device for detecting a leak point by acoustic radiation, including an electro-acoustic transducer, an electronic amplifier and a recording device, and allowing to register a leak by the appearance of acoustic signals £ 1].

The disadvantage of this device is that. it does not allow to determine the size of the leak.

The closest in technical essence and the achieved result is a device for testing products for tightness, containing a series-connected electro-acoustic transducer mounted on the product, a filter unit, an amplifier and a signal processing unit. The number and size of leaks is determined by the number and resonant frequency of gas bubbles using sound receivers and recording equipment {d].

The disadvantage of this device is the impossibility of measuring the exact value of leakage, as the resonant frequency is greatly influenced by the configuration of the leak and the inability to determine the size of the leak during hydraulic loading. .

The purpose of the invention is the measurement of leaks.

This circuit is achieved by the fact that the device is equipped with a pressure sensor installed parallel to the cj electro-acoustic transducer on the product, '' and a sensor signal amplification unit, a logic unit and a leak detection unit, connected in series to it, and the output of the signal processing unit is connected to the input of the logic unit.

The drawing shows a diagram of the proposed device.

315544

The device comprises an electro-acoustic transducer 1 mounted on the product 2, and a filter unit 3, an amplifier 4, a signal processing unit 5, a pressure sensor 6 mounted on the product, and a sensor signal amplification unit 7 connected in series with it, a logic unit 8 and a leakage detection unit 9. In this case, the signal processing unit 5 is connected to the input of the logic side 8.

The device operates as follows.

When loading the product 2 from the hydraulic system, the pressure sensor 6 generates an electric signal proportional to the amount of depletion in the hydraulic system, which is amplified by the amplification unit 7 and enters the logic unit 8, which generates a signal, inversely proportional to ·. the magnitude of the amplitude of the signal from the amplification unit 7, additionally amplified by a factor of K, where K is the proportionality coefficient. The value of K is set on block 8 of the logic before the test.

When a leak occurs in the product 2, elastic vibrations arise, which are detected by the electro-acoustic transducer 1 and converted into electrical impulses, which, through the filter unit 3 and amplifier 4, enter the signal processing unit 5, which generates a command signal for transmitting information from the logic unit 8 to the unit 9 registration of leaks. Block 9 is graduated in units of leakage area, which is associated with pressure P _o and the proportionality coefficient in the following empirical dependence. \

Oh where S is the leak area,

P _{about the} value of the minimum pressure at which acoustic signals occur;

K is the coefficient of proportionality, depending on the penetrating ability of the working fluid and the sensitivity of the registration channel of acoustic signals.

The device allows you to quickly determine the size of leaks and make a decision about the quality of the product.

Claims (2)

(54) DEVICE, FOR TESTING PRODUCTS FOR TIGHTNESS; 33 The device contains an acoustic transform 1 installed on the product 2 and connected to it bpok 3 filters, wiped 4, bpoc 5 signal processing, pressure sensor 6, installed on the product and connected in series with it bpok 7 sensor signal gain, bpok 8 pogih and block 9 registration magnitude tightness. At the same time, the signal processing unit 5 is connected to the input of the spike unit 8. The device works as follows about ™ times. When loading the product 2 from the hydraulic system, the pressure sensor 6 generates an electrical signal proportional to the value of the deflection in the hydraulic system, which is amplified by the unit. 7 gain and enters the logic block 8, which produces a signal inversely proportional to the amplitude of the signal from the gain block 7, which is additionally amplified K times, where K is the proportionality coefficient. The value K is set at block 8 of the logic before the test. When a leak appears in the product 2, elastic oscillations occur, which are recorded by the electro-acoustic transducer 1 and converted into electric pulses, which through the filter unit 3 and amplifier 4 enter the signal processing unit 5, generating a command signal for transmitting information from the logic unit 8 to block 9 registration of the value of leaks. Block 9 is calibrated in terms of the leak area, which is associated with the PQ pv and the proportionality coefficient in the following empirical dependence, где 4 where 6 is the area of the flow; 1 PQ is the minimum pressure at which acoustic signals occur; K - coefficient of proportionality, depending on the penetrating ability of the working fluid and the sensitivity of the channel for recording acoustic signals. The device allows you to quickly determine the size of the leak and make decisions about the quality of the product. Claims The device for testing products for tightness, containing a coherently connected electroacoustic transducer, mounted on the product, filter box, amplifier and signal processing unit, because, in order to measure the leakage, it equipped with a pressure sensor installed on the side-by-side in parallel with an electro-acoustic transducer, and successively connected with it the signal amplification units of the sensor, the logic unit and the recording unit of the unmet chnosti and the signal processing unit output is connected to the input of block pogiki. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 38О91О, cl. Q 01 M 3/24, 1973. 2. USSR author's certificate No. 399753, cl. Q O1 M 3/24, 1974 (prototype).