SU391509A1 - PNEUMATIC SOURCE SEISMIC - Google Patents

Description

I

The invention relates to devices for driving a seismic signal during marine seismic surveys.

The well-known pneumatic seismic signal source containing a high-pressure chamber with an exhaust port, a T-shaped hollow piston and triggering an electric valve, is characterized by a significant variation in response time and short exhaust duration.

In the proposed device, in order to stabilize the response time and increase the exhaust time in the T-shaped piston, radial holes are made in the upper part under the shoulder, and both sides of these holes in the shoulder of the T-shaped piston and in the protrusion of the camera body filled with butter.

The drawing shows the layout of Mo .ro device.

The pneumatic seismic signal source consists of an air compressor 1; high pressure hoses i2; reduction gear 3; triggering electropneumoclan 4; the camera body 5 with an internal RING lug 6 in the middle; T-shaped hollow piston 7 with a shoulder 8 at the top. In the body of the chamber and in the T-shaped piston there are sealing rings 9, Yu and // and annular grooves} 2, 13, filled

oil In the T-shaped piston in the upper part under the shoulder there are radial holes 14.

The device works in the following way.

Compressed air from the compressor / through the sleeves 2 through the openings 15 and .16 enters the high pressure chamber 5 and through the pressure regulator 3 under low pressure into the volume above the piston 7. By acting on this pressure on the face surface of the piston 7 with a diameter d indicated the piston is held in the extreme bottom of the cavity and prevents compressed air exhaust through an orifice of diameter d. The radial holes 14 in the upper part of the piston 7 under the shoulder 8 and the radial holes 16 in the lower part of this piston are located below the seal ring Yu, and the upper arm 8 of the pistons with a diameter unloaded from the pressure of compressed air.

The source is triggered by applying a current pulse to the control electropneumatic valve. 4. At this, a portion of compressed air under high pressure flows through the electric air valve 4 and the hole 17 under the shoulder 8 of the Piston 7 with diameter a-d and moves it up to the hole 14 of the sealing ring 8. Intensive inflow of compressed air from the internal cavity through the holes 14 leads to a significant movement movement of the piston and a sharp opening of the exhaust hole with a diameter of di. A constant airflow of compressed air through the holes M holds the piston 7 in the upper position until the compressed air is completely exhausted FROM high-pressure chambers. After the exhaust under the action of low pressure, the aperture 7 closes the exhaust opening with a diameter of di, the compressed air accumulates in the high pressure chamber, and the source is again ready for processing.

When the piston moves in the Exhaust Process, the rubbing surfaces are washed with a lubricating fluid located in the annular grooves 12, 13 of the piston 7 and the camera body 5, which ensures the stable operation of the source and reduces the number of moving joints.

Subject invention

Claims (2)

1. A pneumatic seismic signal source containing a high pressure chamber with an inner annular protrusion in the middle part, a T-shaped hollow pore / neck with a shoulder at the top and a control electric valve, characterized in that, in order to stabilize the response time and increase the exhaust duration in the T-shaped piston in the upper part under the shoulder there are radial holes. 2. A signal source according to claim 1, characterized in that along Oi6e sides from the radial holes in the shoulder of the T-shaped piston and in the protrusion of the camera body there are annular grooves filled with oil.