US1952690A

US1952690A - Automatic reverse valve for stokers

Info

Publication number: US1952690A
Application number: US566636A
Authority: US
Inventors: Sr Clifton O Strom
Original assignee: RACINE STOKER Manufacturing Co
Current assignee: RACINE STOKER Manufacturing Co
Priority date: 1931-10-03
Filing date: 1931-10-03
Publication date: 1934-03-27
Anticipated expiration: 1951-03-27

Description

Marchzv, 1934. V f qSTRQM, SR 1,952,690

V AUTOMATIC REVERSE-*"VALVE FOR sToKRs Filed Oct 3,;931

@mwj f Il//////// .1, 'ff V q 8^ I Patented Mar. 1934 I UNITED STATES AUTOMATIC REVERSE VALVE FOR STOKERS *www1-:NT OFFICE cine, Wis.

Application October 3, 1931, Serial No. 566,636 4 claims. V(c1. 1er-15s) This inventionappertains to automatic Istokers for furnaces and the like, and more particularly to a novel reverse mechanism for the piston of the stoker ram.

of the-primary objects of my invention is the provision of novelmeans for automatically bringing about the reversing of the piston ram when the pressure acting on the piston reaches a. predetermined degree from any cause whatsoever, such as the piston reaching the end of its stroke, or the piston beingstopped at any point in the cylinder intermediate its stroke from lany Y Another salient object of my invention is the provision of an improved automatic reverse valvel of the operating fluid exceeds a predetermined degree. A further important object of my invention is the provision of an automatic reverse valve,

mechanism for the operating pistons of stokers, comprising a slide valvebody for controlling the ilow of the operating fluid to and from the power cylinder, with a novel pilot valve susceptible ofA being actuated from the pressure of the operating -iluid in the cylinder, when said pressure ex-V ceeds a predetermined degree, the pilot valve acting as means for controlling the automatic operation of the reverse slide valve body.

A still further object of my invention to provide an automatic reverse valve mechanismv for thepower 'cylinder vof the operating ram of a furnace Stoker, of the above character, which will be durable'and efficient in one that willV Vbe simple and easy to manufacture and Vone which can be placed upon the market and incor' poratedwith a conventional low cost.

furnace stoker at a witn'thesesnd other objects in the mvention consists in the novel construction, arrangement and formation of parts, as will be j hereinafter more specically describediclajmed and illustrated in the accompanying drawing, Y in which:

" Figure i is a schematic drawingA illustrating tically the ndvelarrangement of the automatic valve mechanism for the power cylinder of an automatic furnace stoker, the

tion:-

portionvcf the usure beingvshown in secemLdiscs 23. Connecting the reverse valve cas- Figure 2 is a transverse sectional view through the valve mechanism taken 'on the line 2-2 of Figure 1;

Figure 3 is a detail view of the pilot valve' Y utilized in my device, parts of the valve being shown in section. y

Referring to the drawing in detail, wherein similar reference characters. designate corre'- spending parts throughout the several views, the letter A generally indicates my improved automatic reverse valve mechanism for the power cylinder C of a furnace Stoker/(not shown).

The power cylinder C can be of any preferred lor conventional construction and consists of the cylindrical body 5 having the cylinder heads 6 70 and 7 bolted or otherwise detachably secured thereto. YThe cylinder head 7 carries a guide 8 for the plunger rod 9, which leads to the ram of the Stoker andthe rod 9 can be considered as the stoker ram or plunger rod. As shown, a vsuitable stuiiing box 10 is carried by the guide 8 and sur#V rounds the plunger rod. A piston 11 is connected to the inner end of the plunger rod 9 and is re- L ciprocatively mounted `within the cylinder 5.

Adjacent to the opposite ends of the cylinder, '89

the cylinder has communicating therewith, the. ports 12 and 13 and these ports communicate with the casing 14 of the reverse valve forming a part of my improved mechanism A"`. As shown in Figure 1, the ports 12 and 13 communicate with B theK casing 14 on opposite sides of the transverse center of the reverse valve casing. l:Elie ends of the reverse valve casing 14 are closed by removable plugs 15 carrying the valve stops 16. Comm Vmunicating with the ends of the reverse valve casing 14 inwardly of the' step lugs 16 are the high

pressure line pipes

17 and 18 which lead to the pilot valve casing 19, which will be more fully described.

At the transverse center of the casing 14 is ar- .ranged the inlet port 20 for the high pressure pipe Iline which leads directly from the pressure pump, not shown, it being understood that oil is utilized as the operating medium.

Reciprocatively mounted within the reverse valve casing 14 is the reverse valve body 21. This reverse valve body 21 embodies the axiallydisposed longitudinal vextending solid portion 22 having formed thereon the end discs 23 and the spaced. intermediate enlargements 24 and 25. The enlargements 24 and 25 are located on the opposite sides of the transverse center of the valveA body and are spaced a greater distance apart than the distance between said enlargements and the ing 14 with the pilot valve casing 19 is a passageway 26 and this passageway also has communicating therewith, the high pressure inlet port` 20, as will be later described. On each side of the central passage 26 are arranged

passageways

27 and 28 which communicate respectively with the re- 18 at their point of communication with the reverse valve casing.

The opposite ends of the pilot valve casing 19 can be closed by removable plugs 30 and 31.

Connected with the plugs`30 and 31 are the

liquid conduit pipes

32 and 33, and these pipes have communication with one way check valves 34 and 35. As shown, the check valves communicate with the passageways 12 and 13 which lead to the opposite ends of the power cylinder C.

It is to be noted that the check valves 34 and 35 each embody a casing 36 having a valve seat 37 on which is normally seated, the valve body 38, the valve body being held on its seat by the expansion coil spring 39. Reciprocatively mounted within the pilot valve casing 19 is the pilot valve proper 40. The pilot valve proper 40 includes a cylindrical supporting rod 41 having keyed or otherwise secured to the terminals thereof,

abutment discs

42 and 43. These abutment discs 42and 43 are provided respectively with small oil escape ports 44 and 45. I

Slidably mounted on the rod 41 is the valve body sleeve 46 and this valve body sleeve is conned on the rod between the

abutment vdiscs

42 and 43. As shown, the valve sleeve 46 is provided K with endflanges 47, and a pair of spaced intermediate

annular enlargements

48 and 49.

Communicating with the

passageways

27 and 28 and consequently with the interior of the reverse valve casing 14 are outlet passageways 50 and 51 which communicate with the exhaust port 53 which leads to the return line of the pressur pump not shown.

In operation ofmy improved device, and by' referring to Figure 1, it is'to be notedlthat the oil under pressure -owing in the port 20 ofthe high pressure line from the pump (not shown) is conned between the enlargements'24 and 25 of the reverse valve body 21, and, consequently, the oil under pressure is led through the passageway 12 intoV the power cylinder C at the left hand side thereof. This oil under pressure also flows through the passageway 26 around the pilot valve to the Y sition shown in Figure 1.

sion of the spring' of the check valve 34, the' oil under pressure will ow ithrough the pipe 32 and consequently this oil will act on the pilot valve body 40, moving the same to the right. Movement of the pilot valve to the right will close the end of the pipe line 18 and open the end of the pipe line 17 which will, consequently, allow the now of oil under pressure from the inlet port 20, through the passageway .26, laround the pilot valve body 40, into the pipe 17 and into the reverse valve casing 14 at the left hand end thereof. The pressure of the oil acting on the reverse valve body will slide the same to the right which will close. the way 12 from the high pressure port 20 and open way 13 to the high pressure port 20. Thus, the oil under pressure will be led into the power cylinder C" at the right hand end thereof, forcing the'pston 11 to the left hand end of the power cylinder. The oil exhausted from the left hand end of the cylinder will ilow through port 12 around the reverse valve body 21 between one end disc 23 and the enlargement 24, into the passageway 27, for the way 51 and out of the exhaust port 53 back to the inlet end of the pressure pump.

Particular attention is invited to the construction of the pilot valve body and it is to be noted that when the pilot valve body is having its position reversed, say to the right in Figure l of the drawing, the pressure acting on the end disc 42 will slide the rod 41 and the end disc 43. This takes place in view of the fact that pressure has been built up in the -cylinder C by the movement of the piston 1l moving to the left, and hencev the check valve 34 is unseated. The pressure is now greater in pipe 32 than in pipe 33. The check valve 38 on the right-hand side remains seated, and while oil remains in pipe 33, this oil is not under the same pressure as the oil in pipe 32. This will permit the opening of the port 45 in the disc 43 and allow the seeping of the oil conine'd in the right hand end ofthe pilot valve casmg.

The reversing mechanism has been so constructed and designed as to eliminate all back pressure, oil locks and the like. Thus, it is to be noted that when the reverse valve 21 changes its position; the oil can freely exhaust through either the pipe 171er 18, as the case may be.

'While-I have described the invention used solely for reversing the piston at the end of its stroke, it is to be noted that the reverse mechanism is so constructed that the direction of travel of the power piston can be reversed at any time the pressure exceeds a given degree. Thus, if the power piston should -be stopped for any reason at a point intermediate its stroke, it is obvious that pressure will be built up within the power cylinder and that when this pressure relieves vthe tension of the check valve spring, the flow of the oil under pressure past the check valve will act, in the manner described, to reverse the direction of movement of the piston.

, While I have described the use of my improved reverse valve mechanism in conjunction with automatic furance stokers it is to be understood that I do not want it to be confined solely to such use, and it is obvious that the improved valve mechanism can be used in connection with other operating devices.

Changes in details may be made without departing from the spirit or the scope of this invention, but what I claim as new is:

K" 1. The combination with a cylinder havingV a piston reciprocatively mounted therein, of a reverse Valve mechanism for controlling the ow of the uid to and from the opposite ends of the cylinder including a casing and a valve slidably mounted within the casing, a high pressure inlet communicating with a-central portion of the valve casing, saidV valve body including end discs and spaced intermediate enlargements, said enlargements acting to control the 'flow of pressure from ASli the inlet to the opposite ends of the. cylinder, a pilot valve mechanism including a casing and a reciprocatory valve, the casing of the pilot valve mechanism having communication with the fluid pressure inlet at the central portion thereof, the reciprocatory pilot valve body having `end discs and spaced intermediate enlargements, feed pressure pipes connecting the opposite ends of the reverse valve casing with the pilot valve casing on. opposite sides of its transverse center, the enlargements of the pilot valve controlling the ow of pressurefrom the pressure inlet to said means connecting the pilot valve casing with the ends of the reversev valve casing. iiuid conveying means connecting the ends of the lcylinder with the ends of the pilot valve casing, and one way spring-pressed check valves arranged in said last mentioned uid conducting means.

2. The combination with a piston having a piston reciprocatively mounted therein, vof means for controlling the iiow of uid to and from the opposite ends ofthe cylinder including a reverse valve mechanism having a valve casing and a reciprocatory valve 'body a pressure inlet for said valve casing, said body including end discs and spaced intermediate enlargements, fluid passageways connecting the opposite ends of the cylinder with the reverse valve casing on opposite sides of the pressure inlet, said enlargements controlling the flow of pressure from the inlet to said passageways, a pressure outlet, passageways connecting the pressure outlet with the reverse valve casing on opposite sides of the transverse center thereof, the reverse valve body controlling the ilow of uid from the ends of the cylinder to 'said outlet passageways, iiuid pressure means for operating the reverse valve body ineoV cluding a pilot valve casing, and a pilot valve body reciprocatively mountedvtherein, said body having end discs .and spaced intermediate enlargements, iiuid pressure conveying means convsure conveying means connecting the pilot valve reverse valve body for controlling the iiow of uid to and from the casing, the casing having a pressure inlet intermediate its ends and oppositely directed passageways on opposite sides of the inlet leading to the opposite ends of a motor cylinder, uid pressure means for automatically reversing the position of the valve body including a `pilot valve having a casing and a reciprocatory body, fluid pressure conduit pipes communicating -valve mechanism having a valveA casing andra reciprocatory valve body, a pressure inlet for said valve casing, said body including end discs and spaced intermediate enlargements, iiuid passageways connecting the opposite ends of the cylinder with the reverse valve casing on opposite sides of the pressureinlet, said enlargements controlling the ow of pressure f rom the inlet to said passageways, a pressure outlet, passageways connecting the pressure outlet with the `reverse valve casing on opposite sides-of the transverse center thereof, the reverse valve body controlling the ii'ow of fluid from the ends of the cylinder to said outlet passagevvays, iluid pressure means for 11@ operating the reverse valve body including a pilot valve casing, and a pilot'valve body reciprocatively mounted therein, said body having end discs and spaced intermediate enlargements, iiuid presbody on opposite sides of its transverse center with the ends of the reverse valve casing, the enlargements on the pilot valve body controlling the iiow of pressure from the inlet to said pipe `and uid conducting pipes communicating with the ends of the pilot valve casing and the ends of the cylinder, and spring-pressed one-way check valves in said last mentioned pipes, the end discs of the pilot valve having bleed openings therein. 125

' CLIFTON O. STROM, SB.