US1111983A - Automatic exhaust-valve. - Google Patents

Description

E. F. WILLIAMS 8; LE GRAND SKINNER. AUTOMATIC EXHAUST VALVE.

APPLICATION FILED MAR.25, 1913.

1, 1 1 1,983. atented Sept. 29, 1914.

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' q i/um) UNITED STATES PATENT OFFICE.

EDWIN F. WILLIAMS AND LE GRAND SKINNER, 01F ERIE, PENNSYLVANIA, ASSIGNORS TO THE SKINNER ENGINE COMPANY, OF ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

AUTOMATIC EXHAUST-VALVE.

Specification of Letters Patent.

Patented Sept. 29,1914.

Application filed March 25, 1913. Serial No. 756,680.

the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in Automatic Exhaust-Valves, of which the following is a specification.

In the U. S. patent to Skinner and Williams No. 1033280, dated July 28, 1912, there is disclosed a steam engine cylinder with central exhaust ports and intermediate exhaust ports located between the central ports and the ends of the cylinder, the intermediate ports being controlled by valves which are operated by positive mechanical means for opening and closing the same. I i

This construction has certain advantages some of which are referred to in said patent. The object of the present invention is to improve said construction with respect to the means for operating the intermediate exhaust valves, said valves being operated automatically; a further object of the invention is to provide a construction in which saidv intermediate valves are held closed when the engine is working condensing, and allowed to open and close when the engine is working non-condensing, the closed condition in the first instance being produced or %ermitted by the vacuum in the exhaust pipe.

y making these valves automatic, the eccentric, rocker, cams, and other exhaust valve gear is dispensed with.

The invention is illustrated in.- the accompanying drawing which is ahali section elevation of a cylinder provided with the valves Yeferredto.

steam as it passes by the valve and through the port 0 to the exhaust pipe N. This provides a free passage of the steam as the piston travels toward the cylinder head, until the piston has passed over the port above the valve A and closed it, the piston thus acting as a valve. The piston then compresses the steam remaining in the cylinder, and this compressed steam enters the space above the piston C through the passage I, and by pressure on said piston overcomes the spring H and closes thevalve A. This valve remains closed until the piston has returned, in consequence of steam admitted through the inlet valve L, and has cleared or opened the central exhaust' ports M on the 'return stroke, which relieves the pressure within the cylinder and consequently in the space above the piston Q, and the valve A is then lifted and opened by the spring H. The cycle will then-be repeated as long as the engine operatesa nd.v

is working non-condensin Should the engine be operated condensing and a vacuum be created Within the exhaust pipe N, the atmospheric pressure under the piston D will be relieved through the petssage F and the free air entering above the piston I) through the opening E will push the piston down, thereby closing the valve A and holding it closed as long as the engine, runs condensing. It is desirable, when the engine is running noncondensing to relieve the compression in the main cylinder by opening the valve A at proper times, butwhen the engine is running condensing this is not necessary, and it is desirable to hold the valve A closed.

G is a relief valve cylinder.

It will be understood that the parts above described and illustratedrare duplicated at theopposite end of the cylinder, and operatein the same way. The valve andits pistons are mounted in a suitable casing on ktjlylinder shell.

It will be seen that the action of the intermediate exhaust valves depends first on whether the engine is running condensing or non-condensing, being held closed in the former case, provided the vacuum exceeds the strength of the spring H, and being alternately opened and closed when running non-condensing, according to the amount of compression behind the main piston J.

What we claim as new is:

1. The combination with a steam engine cylinder, oi an exhaust valve, means to automatically open and close said valve when the. engme is runnmg non-condensing, and

at the head of the means governed by the vacuum in the exhaust pipe for holding said valve closed when the engine is running condensing.

2. The combination with a steam engine cylinder having main and auxiliary exhaust ports, of a valve controlling the auxiliary exhaust port, means to automatically open and close said valve when the engine is runningnon-condensing, and means governed by the vacuum in the exhaust pipe for closing said valve when the engine is running condensing.

3. The combination with a steam engine cylinder having a middle exhaust port and an auxiliary exhaust port between the middle port and each end of the cylinder, of a valve controlling each auxiliary exhaust port, means controlled by the pressure in the cylinder to open and close said valve when the engine is running non-condensing, and

means controlled by the vacuum in the exhaust pipe for holding said valve closed when the engine is running condensing.

4. The combination with a steam engine cylinder having a middle exhaust port and an auxiliary exhaust port between the middle port and each end of the cylinder, of a. valve controlling each auxiliary exhaust port, a spring tending to hold said valve open, and a pressure operated device connected to said valve and exposed to compression in the end of the cylinder and acting to close said valve when the pressure in the cylinder exceeds the strength of the spring, and another pressureoperated device connected to said valve and exposed to the vacuum in the exhaust pipe and acting to hold said valve closed when such vacuum exists.

5. The combination with a steam engine cylinder having a middle exhaust port and an auxiliary exhaust port between the middle port and each end of the cylinder, of a valve controlling each auxiliary exhaust port, a spring tending to hold said valve open, and a difierential p'iston connected to said valve, one part of said piston being exposed to compression in the end of the cylinder and acting to close said valve when the pressure exceeds the strength of the spring, and the other part of the piston being exposed to vacuum in the exhaust pipe acting to hold said valve closed while such vacuum exists.

6. The combination with a steam engine cylinder, of an exhaust valve operatively controlling the outlet of steam from the cylinder, and means governed by the vacuum in the exhaust pipe for operating said valve.

7. The combination with a steam engine cylinder, of an exhaust valve, means to operatively open and close said valve when the engine is running non-condensing, and means for holding said valve closed when the engine is running condensing.

8. The combination with a steam engine cylinder, of an exhaust valve operative to control the exhaust from the cylinder according to the operation of the engine, and means governed by the vacuum in the exhaust pipe for either permitting the operation of said valve or rendering the same inoperative.

9. The combination with a steam engine cylinder, of an auxiliary exhaust valve operative to control the exhaust from the cylinder according to the operation of the engine, and means governed by the vacuum in the exhaust pipe for either permitting the operation of said valve or rendering the same inoperative.

In testimony whereof, we do aflix our signatures in presence of two witnesses.

EDWIN F. WILLIAMS. LE GRAND SKINNER.

WVitnesses C. D. HIGBY, W. T. BEETZ.

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