US1020922A

US1020922A - Valve.

Info

Publication number: US1020922A
Authority: US
Inventors: Albert E Moorhead
Original assignee: AMERICAN ROTARY VALVE Co
Current assignee: AMERICAN ROTARY VALVE Co
Priority date: 1908-10-28
Filing date: 1911-04-25
Publication date: 1912-03-19
Anticipated expiration: 1929-03-19

Description

A. B. MOORHEAD.

VALVE.

APPLICATION FILED APB..26. 1911.

1,020,922. Patented Mar. 19, 1912.

5 SHEETS-SHEET 1.

A. E. MOORHEAD.

VALVE.

APPLICATION FILED 1211.25, 1911.

1,020,922, Patented Mar. 19, 1912.

5 SHEETS-SHEET 2.

w 14% 39m 1 MM 021 60 A. E. MOORHEAD.

VALVE.

APPLICATION FILED APB.-25, 1911. 1,020,922. Patented Mar.19,1912.

5 SHEETS-SHEET 3.

A. E. MOO-RHEAD.

VALVE.- APPLICATION FILED APR.25, 1911.

Patented Mar. 19, 1912.

5 BHEETS--SHEET 4.

Jwqzzfor gzwzz/ywm A. E. 'MOORHEAD.

VALVE.

APPLICATION FILED APB.26, 1911.

Patented Mar. 19, 1912.

6 SHEETS-SHEET 6.

4 Jul/enfor- Qjai/E/YoW/m fiUZ/(Jb W UNITED STATES P TE T OFFIQE ALBERT E. MOORHEAD, or CHICAGO, rumors, assrcivon, BY MEsNEA ssIGNmENTs, T AMERICAN ROTARY VALVE COMPANY, or CHICAGO,- mmorsfia qortrona'r-roN OF ILLINOIS.

VALVE.

Specification of Letters Patent.

Patented Mar. 125, 1912 Original application filed October as, 1908, Serial No.-459,845. Divided-imam; application niea .11125, .7

1911. Serial No. 623,293..

To all eoho'm it may concern 2 Be itknown that I, ALBERT Moonnsam a citizen of the United States, and a'resident of the city of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Valves; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

. This invention relates to valve mecha-..

nism adapted for use in connection with a pump of engine having a cylinder and a revation of-the rotative valve.

ciprocating-piston therein, and which embraces. arotative valve member operating to controlthe entrance of fiuid to and its exit from theiopp'osite ends of, the cylinder.

A-valve mechanism embodying my nven- ,tion is shown in the accompanying drawings as applied to the cylinder'of .a power-operated; air exhaust pump or compressor, but such mechanism is; applicable to pumps for otherpurposes, as well as to the power cylinders ofen 'nes or motors.

The invention consists in the matters hereinafter set forthand pointed out in the appended claims.

In the accompanying drawings :-Figure 1 is a side elevationof a power-operated pump embodying my invention. Fig. 2 is a plan view thereof. Fig. 3 is a central longitudinal vertical section on an enlarged scale taken through the valve casin show-.

ifigthe rotative valve member in si e elevation. Fig. 4 is a central, longitudinal, horizontal section of the valve casing and rotative valve member. Fig. 5 is a transverse vertical section on the line 5-5 of Fig. 4.

Fig. 6 is a transverse vertical section on the line 69-6 of Eig Fig. .7 isa transverse vertical section on the--line-7-7-0f F ig. 4. Fig. 8 is a perspective. view of- ,the valve, detached from :other,gparts the packinghar and rings rbeingaomitted Fig. 9'. i 's-' adetail-perspective bars-'giFig. 10 is 'f-tcne-"of the afia side elerner'nbenwith a portion of the-sidewall of the same broken away .to showthe; interior-- construction thereof, showing the packing rings and bars in section.

Referring to the drawing lhindicates a rectangular hollow-base, whichforms a sup-f" port for thepump, and in the case of'an airexhaust pump or compressor, may also form a receiver into which the airmaybe'compressed or from which the .air'may =be ex-' hausted. 2 indicates a horizontal driving shaft mounted in

bearings

3, 3, in the top of; the

base 1, and by which the. pump. is driven. Said shaft is provided with a belt pulley 4 over which is trained a driving belt 5, byfwhlch the shaft is driven, 'and'also preferably with a fly-wheel 6; Saiddriving shaft" 2 is provided with a crank 7, which actuates through the mediumofa' connectin rod 8 and a piston rod the pumppiston 9, Fig 4);.

which reciprocates in themaincylinder 10 i i of the pump. Said pump may be used; as,

desired, either as an aircompressoi to de% liver air to the receiver, or as an air-exhaust pump to exhaust the air from the saidre ceiver, dependently upon the adjustment-of the controlling valve of the air pump. I

- Formed integral with the cylinder.10 is a.

part with anannular chamber 13,, connectingby a conduit 14: with the interior of the receiver -1, and connected at its ends throu' h ports. 17, 18,. with'the ends ofthe cylin er 10. Connected withone-end of the valve casing, by an elbow 15, is a pipe'16 adapted to form either. an inlet-or exhaust passage, according to whether the pump is acting to compress air into or exhaust air from the receivensaid pipe 16 being in communication with the interior of the'valve casing through the adj acent open end thereof. The

lar water ackets

19, 19, 5 arranged to sur round its end portions, ,a'nd -a's' having a fixed cylindric bushing 20 formingithe bearing surface-forthe valve-'12; sa bush ng nicating with the annular chamber'13, and

near its. ends with openings coinciding with the cylinder ports 17 and 18. The ends of said valve casing, opposite that to which the valve casin is-shown as'formed-with annu being provided centrally with a series of ports'oropenings21,21, (Fig. 7), comm-u.-

and-11) of which lie in the same plane, but

- the intermediate portion of which is twisted through half a turn; said web being so formed that, when the valve is in the angular position shown in Figs. 3 and 4 of the drawings, the terminal portions 25, 26 of the web are vertical, butits central portion is horizontal; and the web being twisted from said central portion in each direction outward, from a horizontal to a vertical position. The said web extends longitudinally of the valve member'from end'to end thereof, and forms two longitudinal passages therein, one on each side of the said web.

-The other end of the valve or that adjacent to the open end of the valve casing with which is connected the inlet or outlet pipe 16,.is closed on one side of the web 24 by an end wall 28, and is provided with an opening 29 at the other side of the web. Said opening 29 is always in communication with the pipe 16.

Adjacent to the partly open end of the valve member there are formed in the side wall thereof, on opposite sides of the web,

and diametrically opposite each other, two

ports

30, 31, and, in like manner, near the closed end of the valve member there are formed, on opposite sides of the web, two

ports

32, 33. In its central part, the valve member is provided in its side wall with what is practically a single port 34, although the same is divided by a narrow, longitudinal bar or bridge 35. Said central port 34 is always open to the central annular chamber, which latter is connected with the re ceiver by means of the passage 14. The two

end ports

30 and 33, at opposite sides and opposite ends of the valve member, are connected with each other and with the central port 34, by the longitudinal passage at one side of the web 24, while the

end ports

31 and 32, at opposite sides and ends of the valve member are connected with each other and with the end port 29 by means of the longitudinal passage at the other side of said web. The valve member 12 is given rotary motion through the medium of a rotative valve-stem 36, rigidly attached thereto, and extending through one end of the valve easing. As shown in the drawings. said valve stem 36 is attached centrally to the end wall 23 of the valve member,'and passes through and is adapted to turn in the end wall or head 22 of the casing. Said valve stem 36 is provided, outside of said hgad 22 with a rigidly attached hand-wheel 3 The devices employed to actuate the rotative valve member 12.are so constructed that the same is given a half rotation with each half stroke of the piston. In the position of the parts shown in Figs. 3 and 4, the pump is acting to exhaust air from the receiver and the piston 9 has just completed its stroke toward the left and the valve member has completed a half turn, by which the

valve ports

30 and 32 have been brought into communication with the cylinder ports 17 and 18, the central cylinder port 34 at this time being directed upwardly and above the central, horizontal part of the web 24. The central valve port 34 being always in communication with the central passage 13, and the said valve port 29 having constant communication with the pipe 16, it follows that when the piston makes its stroke toward the right, air from the right-hand end of the cylinder will pass from the port 18 downwardly beneath the horizontal central part of the web 24, and outwardly through the end port 29 to the pipe 16; the valve port 31 being at this time closed by the wall of the valve casing. At the same time, as the pistonmoves toward the right, air will bedrawn into the left-hand end of the cylinder from the receiver, throughthe passage 13, the central valve port 3-1, over the central horizontal part of the web 24 and throu h the valve port 30 and cylinder port 17 the valve port 33 at this time being closed by the valve casing. When the piston completes its stroke toward the right, the relative valve member will have made a half rotation from the position shown, and in the subsequent stroke of the piston toward the left, air will be expelled from the left-hand end of the cylinder through the cylinder port 17, and passing through the valve port 31 (which will then register with said port 17), will pass from said port- 31 directly out through the end port 29; the port 32 at the opposite end and opposite side of the valve member being then closed by the valve casin At the same time, the valve port 33 wil be in register with the cylinder port 18, and air will be drawn into the right-hand end of the cylinder, the air at this time passing from the receiver through the central port 34 (which will then be directed downwardly) and beneath the central part of the web 24 to the said port. 33.

If the valve member be given a half rotation, or reversed in position relatively to the actuatin" devices by which it is turned or driven, the pump will act as a compressor. Such reversal of the valve is accomplished by disconnecting the valve-stem 36 from its actuating devices, giving it a half turn by the use of the hand-wheel 37, and then again connecting it with its said actuating devices. \Vhcn the valve member is so reversed, the piston still being in the left hand end of the cylinder, movement of said piston toward the right will expel the air from the right hand end of the cylinder through the cylinder port 18 and valve port 33, from which it will ass to the chamber 13 and the receiver, whi e air will be drawn inwardly to the left hand end of the cylinder, fromthe pipe 16, through the end port 29 and valve port 31. Likewise, in the subsequent stroke of the piston toward the left, air will be expelled from the-cylinder through the cylinder port 17 and valve port 30, and, passing above the web 24, will pass to the receiver throu h the central port 34 and chamber 13, while air will be drawn into the right hand end of the cylinder, from the pipe 16, through the port 29, beneath the central part of the web 24 and through the valve port 32; the valve memberin this latter case being in the same position shown in Figs. 3 and 4, but the piston being at the right hand end of the cylinder and about to make or making its stroke toward the left.

From the above it will be seen that, by reason of the twisted form of the web 24, said web forms in effect two longitudinally extending, spiral passages in the valve member, one of which is in communication with an inlet or outlet passage at the end of the valve casing, and the other of which is in communication with an inlet or outlet assage at the central part of the valve casing, and that, by reason of the arrangement of the end valve ports, at opposite sides of the end portions of said web, the said central inlet or outlet passage is in constant con nection, through one of said spiral passages, with two of said end ports, as 30 and 33, which are located at opposite ends as Well as at opposite sides of the valve member, while the inlet or outlet passage at the end of the valve casing is constantly in connection, through the other of said spiral passages, with the two other valve ports, as 31 and 32, which are located, relatively to each other, at opposite endsand opposite sides of the valve member. 1

While the

central ports

21, 21 of the valve casing are shown in the drawings as so made as to form in effect an annular port extending entirely around the valve chamber, so that the central valve port 34 is in communication with the chamber 13 in all positions of the valve member, yet this particular construction is not essential, it only beingnecessary that said central ort 34 should be in communication with sai chamber 13, during-the time the

end ports

30 and 32, in one instance. and the

opposite end ports

31 and 33, in the otherinstance, are in I communication with the cylinder ports 17 and 18.

In the preferred wnstruct-i'on illustrated the valve actuating devices are connected as follows: A miter-gear 41' is secured upon the transverse driving shaft 2, and meshes with a miter-gear 42 upon a longitudinal shaft 43 arranged in alinement longitudinally with the valve stem 36. Said shaft 43 is connected with the valve stem 36.through the interposition of a clutch 44 which permits the valve to be reversed in its relation to the shaft 43, in order to change the operation of the pump from an exhaust pump; to a compressor. Thesaid clutch 44 con-' parts that are adapted-to be; lnterlocked w1th each other in two diametsists zof two rically reversed positions of one of them, and one of which is movable in-a direction endwlse of the shaft 43. As -show'n, said clutch consists of two clutch-member's 4'5 and 46. The clutch-member'45 iss'eeured to l the outer end of theva-lve stem 36 andis provided on its end -i face-'with a transverse rib adapted to engagea transverse groove in the clutch member 46. The clutch member 46 is mounted and adapted to, slide endwise, without rotation, on-thejsliaft 43i so that it maybe moved-0n thesaid'shaft' to ward and from the clutch'inmbef 45? 'A hand-lever 47 is pivoted oi1 a['fixed"si 1pportand has a forked end, the ann's' of which engage an'annular groove in the clutch member 46, in a'familiar manner.".l Ylijenfit is desired to reverse the operation 'ofthe valve,

'the clutch member 46 is actuated to'release the shaft 43 from the valve stem 36 andt-he latter is turned through half a revolution by means of the hand-wheel37' on t-lie'valve stem, and the parts of the" clutch are again interlocked-so as to connect the valve stem with the shaft 43.

The passage from the valve'casing to the pipe 16 is cont-rolled by means of an outwardly opening check-valve, embracing 'a valve disk 50 (Fig. 3) carried by a stem 51 and adapted to close against an annular seat 52, formed on' a flange 53 at the inner end of the elbow 15. Said stem 51 slides in a fixed guide-sleeve 54 on the elbow 15. Upon the outer end of said stem '51 is secured a piston 55, which slides in a cylin'- der 56 formed'on the elbow 15. The inner end of said cylinder is provided with a restricted airopcni'ngor vent 5'7, s'oihat .the cylinder and piston constitute a dashpotadapted tocushion the valve disk in'its closing movement. The inner end of said cylinder 56' is closed by an integral head onwhich isfor'me'd the guide sleeve 54.

Said valve disk 5 0 .is pressed toward "its seat by means of'a helical spring -58 interposed between the. said valve diskand the head of the cylinder 56. A disk-59, of felt or the like, surrounds the stemfiland is interposed between the outer side'of the valve disk 7-0 and theinner end of the guide-sleeve 54 to cushion the impact of the --valve-disk-against theend of said guidesleeve in the outward movement of the said disk;v 7 .7 v

In order to afford adjustment of the-vent 57, orivfor the purpose of regulating the rate of flow at which theair passes through said vent, the latter is provided with a pivoted door 60. It is necessary to limit f theamount of air which is drawn into the -1might be too reat.

pump when-using it as a compressor, for

,if the full volume of air were drawn into the cylinder, the ower required to compress thejentire v ume of air so admitted In order to so limit the amount of air thus admitted, an adjustable connection is provided between the valve stem and the piston 55, so that the parts may be so adjusted that the closing mov'ement of the valve; disk will be ar- 7 when the same is at a short distance from its seat For this purpose," set-nuts In order toprovide packing means on the exterior of the valve 12 to prevent the passage of air or other fluid between the bearing faces of the valve casing and valve member, in such manner as to avoid leakage from oneto the other of the

ports

30, 31, '32, 33, and 34, and from said ports to the ends of the valve casing, a construction is provided as follows: In the surface of said valve member are formed four circumferential grooves, indicated by 65, 65, two of said grooves being located adjacent the ends of said valve member exterior to the end ports and two of said grooves extendin between the central port 34 and the said en% ports. Within each of said ooves is located a packing ring 66, which is severed or split atone point to permit the same to expand into close contact with the inner surface of the V3.1"G casing. Said valve member is also provided in its exterior surface with two longitudinally extending

grooves

67, 67, which are located midway between the end ports at each side of the valve member, and one extends over the bar or bridge 35. In said longitudinal grooves 1 are seated packing bars 68 (Fig. 9), which v extend across the packing rings outside of .the same, so that the expansive action of said rings tends to press said bars against the cylindri inner surface of the valve casing. The rings 66 and bars 68 are provided respectively with notches 69 and 70, at their intersecting points, the notches being interlocked with each other and the parts being so arranged that the outer surfaces of the bars are flush with the outer surfaces of the packing rings. The valve casing is shown as provided with

oil passages

62, 62, terminating in discharge openings located opposite or over the packing rings 66, 66. The packing rings, arranged as described, separate the surface of the shell longitudinally into three sections, while the packing bars divide said surface circumferentially into two sections. Moreover, the said packing rings and bars not only serve to prevent leakage between the ports and at the ends of the valve member, but the particular arrangement thereof by which the longitudinal bars extend over or outside ofthe rings has a special advantage that may be understood from the following: By reason of the continued rotary motion of the valve member, if the packing rings alone were used, the same, being pressed outward by their resiliency, would tend to wear grooves into the inner surface of the valve casing, but by reason of the presence of the longitudinal bars, the outer surfaces of said rings are always held flush with the outer surfaces of said bars, and as the bars are pressed against and moved along the inner surface of said casing, they distribute the outward pressure produced by the rings along the entire length of the cylindric bearing surface of the casing and thereby afford a uni-- form wear on all parts of said bearing surace.

It is to be understood that a valve mechanism embracing the features of construction hereinbefore set forth may be made in forms differing from that shown in the accompanying drawings, and I do not, there fore, desire to be limited to the specific structural forms and details illustrated in the accompanying drawings, exce t so far as the same may be speci cally c aimed in the appended claims.

I claim as my invention 1. The combination of a cylinder, a piston in the said cylinder, a valve casing provided at its ends with ports communicating with the opposite ends of the cylinder and with a central port, a rotative valve member, and;

means for turning the valve memberf a half rotation at each stroke of the piston, said valve member being providedjat each offits v, I

ends with two lateral: ports located at oppo site sides thereof, and adapted for cemmu'm-T 1 cation with the cylinder ports in alternation? in the rotation of said valve member, in 'itscentral part with a lateral port adapted for communication with the central port of the valve casing, and in at least one of its ends a central port, a rotative valve member, and

means for turning the valve member a half rotation at each stroke of the piston, said valve member consisting of a cylindric shell provided with a transverse web forming two longitudinal passages therein and also provided at each of its ends with two lateral ports located one at each side of the adjacent end of the web, and adapted for communication with their associated cylinder port in alternation in the rotation of the valve member, each of said lateral ports being connected b one of said longitudinal passages with the l ateral port at the opposite end and side of the valve member, and said valve member having a central lateral port opening from one of said longitudinal passages and adapted for communication with the central port of the valve casing at times when either of the lateral end ports is in communication with its associated cylinder port, and said valve member also having in at least one of its ends an end port opening from the other of said longitudinal passages.

3. The combination of acylinder, a piston in the said cylinder, a valve casing provided at its ends with ports communicating with the opposite ends of the cylinder and with a central port, a rotative valve member, and means for turning the valve member a half rotation at each stroke of the piston, said valve member consisting of a cylindric shell provided with a transverse longitudinal Web, the end portions of which are in the same plane and the central portion of which is twisted a half turn so as to form two longitudinal, spiral passages in said valve member, and provided also, at each of its ends, with two lateral ports located at opposite sides of the adjacent end of the web, each of said lateral ports being connected by one of said spiral, longitudinal passages with the lateral port at the opposite end and side of the valve member, and said valve member having a central lateral port opening from one of said longitudinal passages, and also having in at least one of its ends an end port opening from the other of said longitudinal passages.

-l-. The combination of a cylinder, a piston in said cylinder, a valve casing provided with a cylindric valve chamber and with two cylinder ports each leading to one end of the cylinder, and having central and end passages each of which is to be brought by the action of the valve alternately into communication with each end of the cylinder, a cylindric valve member in said chamber provided at each of its ends with two lateral ports adapted to be brought alternately into communication with the associated cylinder port by'the turning of the valve member, and with two longitudinal passages, each of which connects that one of the two lateral ports at one end of the valve member which, at any one time, is in communication with its associated cylinder port, with that one of the two lateral ports at the opposite end of the valve member which is at the same time cut off from communication with its associated cylinder port; one of said longitudinal passages having constant communication with the central passage of the valve casing and the other of said longitudinal passages having constant communication with the end passage of the valve casing, and means for turning said valve member to bring the two lateral ports at each end thereof alternately into communication with the cylinder port associated therewith.

5. The combination of a valve casing having a cylindric valve chamber, a rotative cylindric valve member, circumferential packing rings surrounding the valve member and packing bars extending longitudinally of the valve member exterior to said packing rings.

6. The combination of a valve casing hav ing a cylindric valve chamber, a rotative cylindric valve member provided with circumferential and longitudinal grooves, packing rings inserted in the circumferential grooves and parking bars inserted in said longitudinal grooves and crossing the packing rings exterior to the latLer.

In testimony, that I claim the foregoing as my invention l allix my signature in the presence ol' two witnesses, this 18th day of \pl'll,

AliBER'l. E. MOORHEAD.

Vitncsses:

C. Cnnmxcn Poona, Gnonon R. \Vnucms.