US1240539A - Regulator for fluid-compressors. - Google Patents

Description

E. L. BULKLEY.

REGULATOR FOR FLUID COMPRESSORS.

APPLICATION FILED DEC-5,1914.

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Patented Sept. 18,1917.

UNITED STATES PATENT OFFICE.

EMERY L. BULKLEY, OF PAINTED POST, NEW YORK, ASSIGNOR TO IN GERSOLL-RA'ND COMPANY OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

REGULATOR FOR FLUID-OOMPRESSORS.

Specification of Letters Patent.

Patented Sept. 18, 1917.

Application filed December 5, 1914. Serial No. 875,589.

To all whom it may concern:

Be it known that I, EMERY L; BULKLEY,

a citizen of the United States, residing at Painted Post, in the county of Steuben and State of New York, have invented a certain new and useful Improvement in Regulators for Fluid-Compressors, of which the following is a specification. This invention relates to regulators for fluid compressors, and more particularl to regulators wherein, to reduce the loa on the compressor, the intake of the compressor is closed and the discharge line opened to atmosphere whenever the pressure in the receiver reaches a predetermined amount.

It has been proposed in this type of regulating mechanism to operate both the intake closing valve and the discharge line opening valve simultaneously, by admitting compressed fluid from a pressure controlled valve to the operating-motors of both intake and discharge line valves at the same time. In cases, however where the compressor is unloaded at frequent intervals there is a considerable waste of energy, in that all the air in the compressor at the time the unloading valves areoperated is pumped through the compressor and out into the atmosphere.

The object of the present invention is to provide means whereby the discharge line unloading valve will not be opened to atmosphere until a short time after the intake valve is closed. This will allow all, or a large portion, of the air in the compressor to pass through the discharge line and to the receiver before the discharge line valve is opened.

With this object in view, a regulating mechanism has been devised, a practical embodiment of which is represented in the accompanying drawing, which shows an end elevation of a compressor with the important parts'of the regulating mechanism in section.

The compressor, as shown, comprises a low pressure cylinder 1 and a high pressure cylinder 2, connected by an intercooler 3. In the inlet pipe 4, which leads into the low pressure cylinder 1, is an intake closing valve 5 which closes against a seat 6. The valve '5 is opened or closed by a piston .7 which slides in a cylinder 8. In the discharge line 9 of the compressor which leads to a receiver 10 is placed a discharge line unloading valve 11 which controls a port 12 leading by a pipe 13 to atmosphere. In the discharge line 9 is also a check valve 14 which prevents the return of fluid from the receiver 10 when the port 12 is open. The discharge line unloading valve 11 and check valve 14 may be of any well known construction, but are here shown as disclosed in the patent to'William F. Treiber, No. 1,093,299,

dated April 14th, 1914.

- Fluid under pressure to operate the valve 5 and valves 11 and 14 is admitted to these valves at a predetermined receiver pressure through the agency of a pressure controlled valve 15, such as shown, for instance, in the patent to J. H. Castle and W. G. Rogers, No. 1,138,278, dated May 4th, 1915, which is connected to the receiver 10 by a pipe 16, this connection not being shown. The valve 15 communicates with the cylinder 8 by a short pipe 17 and with the valves 11 and 14 by a pipe 18 of considerable length, which for a portion of its length is divided into two branches 19 and 20, there being an adjustable globe valve 21 in branch 19, and a check valve 22 in branch 20, this check valve opening in such a direction that the air 11'].- not flow through branch 20 toward the valves 11 and 14 but can flow freely in the other direction.

In operation, when the pressure in the receiver 10 rises to a predetermined maximum, the valve 15 operates to admit fluid to the pipes 17 and 18, the fluid passing through the pipe 17 into the cylinder 8, immediately raising the piston 7, closing the valve 5, and shutting off the admission of air to the inlet pipe 4 of the compressor. The air entering the pipe 18 cannot pass through check valve 22 and the globe valve 21 is so adjusted that the air can only pass slowly to the valves 11 and 14. This will delay the opening of the discharge valve 11 and the valve 21 can be so adjusted that this valve 11 will. open as soon as all the air in the cylinder of the compressor at the time the valve 5 was closed has been passed into the receiver, past check valve 14. When the pressure in the receiver again falls, due to the unloading of the compressor, to the predetermined minimum pressure for which valve 15 is adjusted, the fluid under pressure operating valves 5, 11 and 14 will be discharged to atmosphere, allowing these valves to again resume their normal positions. The operation of valvesll and 14 is, however, not retarded in closing by the restricted flow of air through the valve :21, as the escaping air can flow freely past check valve 22, enablii'ig valves 11 and 1-L to quicker resume their normal positions.

It is to be understood that while the present showing and description discloses only one specified modification of my invention, other forms and modifi ations are included in the spirit and scope of the same as ex pressed in the claims.

What I claim is:

1. In a regulator for fluid compressors, in combination, a compressor, its receiver, a fluid operated discharge line unloading valve mechanism, a fluid operated intake closing valve, a passage to convey fluid to said intake closing valve, a passage to convey fluid to said discharge line unloading valve mechanism, said passage having valve mechanism arranged to restrict the flow of fluid in a direction to open said unloading valve mechanism, and means to admit fluid alve mechanism, a fluid operated intake closing valve, a passage to convey fluid to said intake closing valve, a passage to convey fluid to said discharge line unloading valve mechanism, said passage having adjustable valve mechanism arranged to restrict the flow of fluid in a direction to open said unloading valve mechanism and to allow free flow in the other direction, and means to admit fluid to said passages at a predetermined receiver pressure.

In testimony whereof, I have hereunto set my hand.

EMERY L. BULKLEY.

\Vitnesses:

J. WILLIAM JONES, A. O. CARPENTER.

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