Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1987-08-18
1989-05-02
Steinberger, Brian S.
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
367144, 25112901, 439271, H04R 102
Patent
active
048259730
ABSTRACT:
The disclosure relates to a solenoid valve for an air gun which substantially increases the rate at which maximum air flow is achieved. The new valve structure includes a coil actuated plunger, which is preferably solid and formed of a magnetically permeable material and closes an annular 360 degree port opening between the valve inlet and valve outlet when in the unactuated state. This plunger position is maintained by a biasing spring which forces the forward annular sharp plunger edge against a face seal in the nose of the valve, thereby sealing the valve input port from its output port. Upon actuation of the solenoid valve coil, the plunger is moved against the bias of the spring very rapidly, thereby speedily uncovering the channel between inlet and outlet and permitting rapid 360 degree communication between the inlet and outlet to permit maximum air flow therebetween and out of the outlet port. Air flow is past the edge of the plunger and along an unimpeded 360 degree path rather than through a hollow stem. The importance of this is that the pressure provided by the solenoid valve builds up much faster and results in a much improved timing of the air gun firing (reduction in firing jitter).
REFERENCES:
patent: 3588039 (1971-06-01), Chelminski
patent: 4034827 (1977-07-01), Leerstrov, Jr. et al.
patent: 4240518 (1980-12-01), Chelminski
patent: 4623033 (1986-11-01), Harrison, Jr.
Texas Instruments bBrochure, Texas Instruments Sleeve Gun, Texas Instruments Incorporated, 1985, pp. 1-5.
Harrison et al., A New Generation Airgun, Geophysical Service Inc., 12/84, pp. 1-8, FIGS. 1-13.
Devine Thomas G.
Halliburton Geophysical Services Inc.
Steinberger Brian S.
Walkowski Joseph A.
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