US1042497A - Steam-pump. - Google Patents

Description

L. K. STEVENS.

STEAM PUMP.

APPLICATION FILED MAR. 29, 1912.

1,042,497., Patented Oct. 29, 1912.

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- COLUMBIA PLANOGRAPH 60-, WASHINGTON. D. c,

L. K. STEVENS.

STEAM PUMP.

APPLICATION FILED MAR. 29, 1912.

1,042,497, Patented 001;. 29, 1912. v

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LEON STEVENS, OF NEW YORK, N. Y., ASSIGNOR To M. 'r. DAVIDSON COMPANY, A CORPORATION OF NEW YORK.

STEAM-PUMP.

Application filed March 29, 1912.

To all whom it may concern Be it known that I, LEON K. STEVENS, a citizen of the United States, and a resident of New York city, borough of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Steam-Pumps, of which the following is a specification.

My invention relates to engines such as steam pumps and particularly to the valve portions.

The object of my invention is to provide a valve construction of simple and durable construction which may be operated without the use of any lubricant other than the moisture contained in the working fluid.

A further object is to provide a construction in which all the valve parts may be arranged on the top or side of the steam cylinder of the engine and removed therefrom entirely without removing or changing any of the parts of the main working cylinder.

A further object is to provide a construction in which the valve elements are practically steam balanced, thereby preventing excessive wear.

Further objects and advantages will be pointed out in the following specification.

Referring to the drawings which form a part of this specification Figure l is a longitudinal sectional view through the steam valve and cylinder portions of the stem end of a pump or engine. Fig. 2 is a cross sectional view taken on a line through the center of the inlet and exhaust ports. Fig. 3 is a sectional view on a larger scale, through the mechanically operated control valve. Fig. 4 is a cross sectional view of a portion of the control valve. Fig. 5 is a View of one of the half portions of the control valve disclosing chambers formed therein and the form of spring employed.

20, indicates the usual steam cylinder casting of a steam pump; 21, the cylinder formed therein; 22, the yoke frame which connects the steam cylinder casting to the water cylinder casting.

23, is a casting containing the main steam valve cylinder 24: in which are located two pistons 25 and 26 respectively, which are connected together by a rod 27 of smaller diameter than the opening formed in the valve 27 through which it extends and control a slide valve 27 which is located between them and is free to move vertically at Specification of Letters Patent.

Patented Oct. 29, 1912.

Serial No. 687,053.

a right angle to the axis of the rod 27 to permit the valve to move downward relative to the pistons in case of wear, as will be readily understood.

Each of the pistons 25 and 26 is provided with a perforation or passage 28 which establishes communication between the main steam chest or inlet passage 29 which is inclicated in dotted lines in Fig. 1, and may be located on either side of the cylinder 24, which perforations permit steam to pass from the chamber 29 through the pistons to the spaces formed at the outer end of same, alternately as the valve 27 is reciprocated, as will be readily understood.

The top of the valve 27 is provided with a longitudinally extending slot 27*, and a cover 27 is provided with a depending guide 27 which extends through an opening 24 formed in the cylinder 24:, and into said slot to guide the valve and prevent it from turning on its axis.

A longitudinally extending recess 27 and 27 respectively are formed in each side of the valve, one of said recesses being located opposite the inlet port 29, said recesses per mitting the steam to flow to each side of the valve to balance same, thus leaving the exhaust passage under the valve the only unbalanced area, and this area being relatively small, the valve as a whole is practically steam balanced, and will wear well on this account.

The casting 23 is provided with steam passages 30 and 31 respectively which extend from the chamber or inlet port 29 when the valve is in position to admit steam to the opposite ends of the cylinder 21, and are controlled by the valve 27. Formed in the ca'sting23 is a cylindrical opening which extends entirely through from side to side, and is provided at one end with a cap 33 and exhaust pipe 34, through which the exhaust steam flows when liberated from the cylinder 21.

Fastened to the opposite side of the cast ing 23 is a ring 35 which is provided with a projecting portion 36 which enters the opening 32, hereinafter referred to as the exhaust chamber. Fitted in the ring 35 is a rotary valve 37 which I prefer to make in two parts, but which could be made in one piece if desired. The valve 37 comprises two semi-circular portions which are alike in form and are fitted to closely contact with the inner periphery of the ring 35. One of said portions is provided with a port 38 and the other with a port 38 which are adapted to register alternately with the ports 39 and 40 formed in the ring 35 and the outlets of which are preferably located diametrically opposite to each other to balance the steam pressure on the valve 37, and which in turn communicates respectively with the passages 41 and 42 formed in the casting 23 and leading to the respective ends of the cylinder 24.

When the control valve 37 is made in two halves as illustrated, a depression 43 or chamber is formed in each half between the abutting portions and a spring 44 is placed in each chamber and exert pressure against the valve elements to hold their outer surfaces in contact with the seat to keep the parts in close contact even after the valve has become worn to a considerable degree.

Each of the segments of the valve 37 is provided with a projection 46 which for the purpose of easy machining I prefer to form in the arc of a circle as illustrated and which projections serve as abutments. The valve 37 is provided with a central opening 47 which serves as an exit for the steam exhaust from behind the pistons 25 and 26 and also permits the exhaust steam to flow to each side of this valve 37 to preserve a steam balance during the exhaust of the steam from the main cylinder.

The ring 35 is provided with an annular flanged portion 48 against which one face of the valve 37 may abut to prevent said valve from slipping into the chamber 32. A flanged casting 50 is fitted to the outer surface of the ring 35 and is provided with a bore 51 and a bearing 52. A rotatable shaft 53 is fitted in the bearing 52 and carries on its inner end a flange 54 which is fitted in the bore 51 and extending across the face of the flange 54 and formed integral therewith is a rectangular shaped projection 55, the opposite ends of which extend to the ends of the abutments 46 formed on the valve 37. The ring 35 is preferably fitted to the face of the casting 23 by a ground joint at 56 to insure the ports which lead from the valve cylinder 24 to the exhaust chamber being tight at this point.

The flanged casting 50 and ring 35 are held. to the casting 23 by bolts 57-57 etc. which extend entirely through the casting 50 and ring 35 and screw into the casting 23 as illustrated. A piston 58 is fitted in the main cylinder 21 and is provided with the usual piston rod 59 which extends through the stuffing box 60 and carries a cross head 61. Connected with and reciprocated by the cross head 61 and piston 59 is a side rod 62 which connects with a lever 63, which in turn is connected to the shaft 53. The lever 63 which is indicated in dotted lines in Fig. 1 is provided at one end with a slot 64 also indicated in dotted lines to permit the movement of the lever 63 to be varied depending on the point at which the side rod 62 is connected with the lever, as will be readily understood.

Assuming that steam is admitted through the inlet pipe 65, through the inlet port 29, steam will flow through the passage 27 to the inner faces of the pistons 25 and 26 and through the passages 28 in the pistons 25 and 26 respectively, thus balancing the same and also around into the recess 27 thereby balancing the valve pressure on the sides of the valve 27. In the position of the valve as shown in Fig. 1, the steam has exhausted through the passage 41 and is in open communication with the exhaust port and the piston 58 is beginning its stroke with steam supplied through passage 31. It will be understood that the passages 41 and 42 are of considerably greater area than the passages 28 in the pistons 25 and 26, so that the steam from behind the pistons will exhaust very rapidly compared to the amount of steam which is passing through the port-s 28.

lVhen the valve pistons have reached the respective end of their stroke, the piston located adjacent the head of the cylinder will overrun and cover the valve port to passage 41 as illustrated in Fig. 1, thus helping to prevent leakage of steam even though the control valve should become worn and leaky. The piston 58 now begins to make its stroke, and the piston rod transmitting motion through the side rod 62 and lever 63 to the shaft 53 and turning said shaft until the projecting abutment 55 contacts with the end of the abutments 46 when the valve will begin to rotate and the ports 38 will be carried around into communication with the ports 40, thus opening a passage for the high pressure steam in the chamber 66 to exhaust from said chamber through said ports and valve to the exhaust chamber 32 and thence to the atmosphere. It will be obvious, however, that the passages 28 may be formed in the walls of the cylinder 24 and lead to the opposite ends thereof, the function being simply to carry the steam behind the ends of the pistons.

The high pressure steam at the opposite end of the piston 25 will then exert its force and force the valve 27 to the opposite end of the cylinder 24, thus permitting the steam to exhaust through the passage 31 from the cylinder 21, under the valve 27 to the exhaust chamber 32 and admitting steam through the passage 30 and the opposite end of the piston 58 to reverse the stroke of said last named piston. The piston 58 on again the steam from behind the piston and permitting the steam behind the piston 26 to exert its pressure and move the valve 27 to the position shown in the drawing, thus admitting steam through the port 31 to the piston. 58 and cause it to make its next stroke as will be clearly understood.

By reason of having all of the valve elements located in a single casting which is bodily removable from the main cylinder casting 20, the valve parts may be repaired or renewed in less time and with much more facility than were any of said valves located in the cylinder heads or connected with the casting 20.

Having thus described my invention, I claim as new 1. A steam pump comprising an exhaust passage, a removable ring abutting said passage and fitting therewith, said ring having ports therein, a rotary valve having ports adapted to register alternately with said ports in said ring, and means for rotating said valve to alternately open and close communication between said ports, substantially as set forth.

2. A steam pump comprising a removable ring having ports therein, a rotary valve comprising two segments placed together to form a circular periphery and fitted to rotate in said ring, said segments being provided with exhaust ports which are adapted to register alternately with said ports in said ring, and means for rotating said valve to alternately open and close said ports.

3. A steam pump comprising a removable ring having ports therein, a rotary valve consisting of two segments placed together to form a circular periphery and fitted to rotate in said ring, said segments being provided with exhaust ports which are adapted to register alternately with said ports in said ring, and means for rotating said valve intermittently to alternately open and close said ports.

at. A steam pump comprising a removable ring having ports therein, a rotary valve consisting of two segments placed together to form a circular periphery and fitted to rotate in said ring, both of which are provided with exhaust ports which are adapted to register alternately with said ports in said ring, means for balancing the steam pressure on each side of said valve, and means for rotating said valve to alternately open and close said ports.

5. A steam pump comprising a removable ring and having ports therein, a rotary valve consisting of two segments placed together to form a circular periphery and fitted to rotate in said ring, said segments being provided with ports adapted to register alternately with said ports in said ring, means for forcing said segments in contact with the inner surface of said ring, and

means for rotating said valve to alternately open and close said ports.

6. A steam pump comprising a circular seat having ports therein, a rotary valve consisting of two segments placed together to form a circular periphery and fitted to rotate in said seat, one segment of which is provided with an exhaust port which is adapted to register with an exhaust port in said seat, and means for rotating said valve to alternately open and close said port.

7. A steam pump comprising a circular valve seat having steam exhaust ports formed therein, a rotary valve comprising two segments placed together to form a circular periphery and fitted to rotate in said seat, said segments having a central bore and each provided with an exhaust port, and means for rotating said valve to alternately open and close the exhaust ports in said valve seat 8. A steam pump comprising a circular valve seat having steam exhaust ports formed therein a rotary valve comprising two segments placed together to form a circular periphery and fitted to rotate in said seat, said segments being each provided with an exhaust port, and means for rotating said valve to alternately open and close the exhaust ports in said valve seat.

9. A steam pump comprising a removable ring having a circular valve seat and having steam exhaust ports formed therein, a rotary valve comprising two segments placed together to form a circular periphery and fitted to rotate in said seat, said segments being each provided with an exhaust port, and means for rotating said valve to alternately open and close the exhaust ports in said valve seat.

10. A steam pump comprising a removable ring having a circular valve seat and having steam exhaust ports formed therein, a rotary valve comprising two segments placed together to form a circular periphery and fitted to rotate in said seat, said segments being each provided with an exhaust port, and means for intermittently rotating said valve to alternately open and close the exhaust ports in said valve seat.

11. A steam pump comprising a removable ring having a circular valve seat and having steam exhaust ports formed therein, a rotary valve comprising two segments placed together to form a circular periphery and fitted to rotate in said seat, said segments having a central bore, and each provided with an exhaust port, and means for intermittently rotating said valve to alternately open and close the exhaust ports in said valve seat.

12. A steam pump comprising a removable ring having a circular valve seat and having steam exhaust ports formed therein, a rotary valve comprising two segments placed together to form a circular periphery and fitted to rotate in said ring, said segments being provided with exhaust ports which are adapted to register alternately with said ports in said ring, said segments being each provided with a projection on each side thereof forming abutments, a shaft provided with a projecting flange adapted to engage said abutments, and means for rotating said shaft to operate said valve.

13. A steam pump comprising an exhaust passage, a removable ring having an annular projection fitting within the passage, said ring also having ports therein, a rotary valve having a port adapted to register alternately with said ports in said ring, and means for rotating said valve to alternately open and close communication between said ports, substantially as set forth.

14:. A steam pump comprising a removable ring having ports therein, a rotary valve consisting of two segments placed together to form a circular periphery and fitted to rotate in said ring, one segment of which is provided with an exhaust port which is adapted to register alternately with said ports in said ring, and means for rotating said valve to alternately open and close said ports.

15. A steam pump comprising a removable ring having ports therein, a rotary valve consisting of two segments placed together to form a circular periphery and fitted to rotate in said ring, one segment of which is provided with an exhaust port which is adapted to register alternately with said ports in said ring, and means for rotating said valve intermittently to alternately open and close said ports.

16. A steam pump comprising a removable ring having ports therein, a rotary valve consisting of two segments placed to gether to form a circular periphery and fitted to rotate in said ring, one segment of which is provided with an exhaustport which is adapted to register alternately with said ports in said ring, means for balancing the steam pressure on each side of said valve, and means for rotating said valve to alternately open and close said ports.

17. A steam pump comprising a removable ring having ports therein, a rotary valve consisting of two segments placed together to form a circular periphery and fitted to rotate in said ring, one segment of which is provided with an exhaust port which is adapted to register alternately with said ports in said ring, means for forcing said segments in contact with the inner surface of said ring, and means for rotating said valve to alternately open and close said ports.

Signed at New York city, in the county of Kings and State of New York this 19th day of March A. D. 1912.

LEON K. STEVENS.

Witnesses:

FRANK M. ASHLEY, W. C. NEWELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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