SU684356A1 - Hydraulic pulse generator - Google Patents

Description

made in the form of a snfone, the internal cavity of the KOTcipiTo is ooelinen with its upper part, and the bulkiness, arr. It is designed by the hydropulsator case, and the outer surface of the bellows, with the lower part of the vessel, while the upper part of the vessel is connected to the gas supply line. In the drawing of the pennant the described hydropulsator. On the table 1 of the vibrating stand, a cylindrical body 2 is installed, in the cavity of which {there is a stepped plunger consisting of high pressure plungers 3 and low pressure 4 (respectively, the narrow and wide part of the plunger is stepped) ({the end of the plunger 4 goes into closed the end of the bellows 5, welded to the inner flange 6, sealing the bottom of the housing 2, the upper part of the housing 2 is mounted on the uprights 7. The plungers 3 and 4 are coaxially connected to each other are also rigidly connected to the inertial 1-arm 8. The narrow end of the plunger 3 is placed into the cavity 9 Sensor 10. The cavity 9 is filled with oil. The low pressure cavity, formed by the housing 2 and the outer surface of the bellows 5, is connected to a vessel 11 filled with half oil and connected to the gas (nitrogen) supply line 12. The top of the vessel 11 filled with gas (nitrogen), connected to the inner cavity of the bellows 5. The proposed hydropulsator works as follows: Having installed 9 calibrated sensors 10 in the cavity and filling it with oil, they supply nitrogen gas through line 12 to vessel 11 under a certain pressure. The vibrostand is switched on and the required vibratory overloads are created and the readings of the calibrated sensors are recorded. The pressure in the cavity 9 of the gaugeable sensor (high pressure cavity) is determined by the formula

where Pg is the pressure in the cavity of high pressure

Pc is the pressure in the low pressure cavity;

Sj is the cross-sectional area of the plunger entering the high pressure cavity;

Zd is the area of the plunger section entering the low pressure cavity;

n - area ratio

Uh

34If, when fed into the cavity formed by the housing 2 and the outer surface of the bellows 5,

Claims (1)

Invention Formula A hydropulsator containing a vibrating table with a cylindrical body fixed on it, in the cavity of which a plunger is placed, dividing it into two opposite chambers of unequal in volume, the chamber formed by the upper ends of the plunger and housing, connected to a calibrated sensor, and the opposite chamber connected to the oil supply line and provided with an elastic element abutting the plunger with the upper end, a lower pressure, for example 150 kgf / cm, a high static pressure equal to Pj, Pj; 150.10 1500 kgf / cm. Thus, using a system for regulating the pressure of nitrogen gas, for example, up to 350 kgf / cm, it is possible to obtain static pressures in the cavity of a calibrated sensor with n 10 to 3500 kgf / cm. The amplitude of the pressure pulsations in the cavity of the calibrated sensor for the proposed hydropulsator is determined by the formula: i -A, where dP is the amplitude of the pressure pulsations in the cavity of the sensor being calibrated; Q is the mass of inertial load; Nd - vibration accelerations (vibration loads) acting on the inertial mass in units of g (, 81 m / s); S is the cross-sectional area of the plunger 3. The pressure pulsations in the low-pressure cavity are damped by the bellows under the pressure of nitrogen gas and therefore do not have a significant effect on the amplitudes of the pressure pulsations in the high-pressure cavity. For example, with a mass of inertial load equal to 5 kg, the cross sectional area of the plunger is 3-1 cm and vibration accelerations acting on the mass of the inertial load equal to 20 g, the amplitude of pressure pulsations in the cavity of the sensor being calibrated reaches kgf / cl The proposed hydropulsator allows using adjustable gas supply systems of up to 350 kgf / cm and serial flow shakers, which create vibratory overloads up to, for calibration of sensors, pulse pressure amplitudes up to kgf / cm at static pressures () up to 500 kgf / cm.