US1971171A - Plate valve - Google Patents

Description

w. E. BEBVBINGTON PLATE VALVE Filed March 20. 1931 3 Sheets-Sheet 1 INVENTOR.

I/lfz'lh EB cbbizyfoa 4 4; H15 ATTORNEY? 1934- w. E. BEBBINGTON 1,971,171

PLATE VALVE Filed March 20, 1931 3 Sheets-Sheet 2 INVENTOR. E Ifi'Miam/EBebbirydvn/ YM-QZ HIS ATTORNEY.

Aug. 21, 1934. w. E. BEBBINGTON 1,971,171

PLATE VALVE Filed March 20. 1951 s Sheets-Sheet s v Inn 1 1 1m l l E INVZNTORZ MGM/5am Bab any 012! w 1115A TTORNEY Patented Aug. 21, 1934 UNITED STATES PATENT rice PLATE VALVE William E. Bebbington, Painted Post, N. Y., as-

signor to Ingersoll-Rand Company,

Jersey,

City, N. J., a corporation of New Jersey Application March 20, 1931, Serial No. 523,992

6 Claims. (01. 251-119) upon whether the valve is intended to serve the function of an inlet valve or of a discharge valve.

One object of the invention is to prevent sharp and consequent noisy impact of the valve plate against the stop elements which limit its range of movement.

Another object is to allow the initial unseating movement of the valve plate to takeplace against comparatively light resistance and to assure an increased cushioning action upon the valve plate during the subsequent or final portion of the unseating movement of said valve plate.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawings accompanying this specification and in which similar reference characters refer to'similar parts,

Figure 1 is a sectional elevation of a plate valve constructed in accordance with the practice of the invention,

Figure 2 is a perspective view of the plate valve,

Figure 3 is a similar view of a guide member for the valve plate,

Figure 4 is a perspective view of the spring plate, 1 a

Figures 5, 6 and '7 are side elevations of the plate valve illustrating limiting and intermediate positions of the reciprocable parts during the unseating movement of the valve plate,

Figure 8 is a side elevation of a modified form of spring plate, and

Figure 9 is a side elevation of a valve mechanism equipped with a spring plate of the form illustrated in Figure 8.

Referring to the drawings and at first more particularly to the preferred form of construction illustrated in Figures 1 to '7 inclusive, A designates generally a'plate valve comprising a valve seat B, a stop plate 0 which is secured to the valve seat B by means of a bolt D, and a nut E threaded on the bolt D.

Interposed between the valve seat B and the stop plate C is a washer or guide member F through which the bolt D also extends. The washer F determines the width of a space G between the valve seat 13 and the stop plate C. The peripheral surface H of the washer F acts as a guide surface for a valve plate J dis--v posed in the space G to control ports K in the I valve seat B and through which fluid may pass to or from the compressor, depending upon whether the valve assembly is being used as an inlet valve or as a discharge valve.

The ports K may be of any suitable number and extent to assure port area commensurate with the requirements of the compressor.v The stop plate C may, as illustrated, be provided with similar ports L to provide ample passage for the fluid issuing from or flowing to the ports K.

The ports K and L may assume any desired 1 shape as for instance, arcuate and the valve plate J is therefore also preferably provided with arcuate ports 0 through which the fluid may flow from the ports K to L, or vice 'versa. 1

and will therefore be staggered with respect to u r the ports K.

In order to maintain the weight of the ,valve plate J to a minimum and also toavoid overlapping portions of unnecessarily large extent on the valve plate J and the valvev seat B, the

washer Fmay be of such diameter that its peripheral surface H lies closely adjacent the inner port K. When so arranged, the washer F may be provided with slots or notches P of suitable area to provide channels for pressure fluid fiowingfrom the innermost ports K to the innermost ports L in the stop plate.

In accordance with the present invention, means are provided to eifect adequate cushioning of the valve plate J during the unseating movement of said valve plate. To this end the valve mechanism is provided with a spring'plate designated generally by Q which is interposed portion R are a plurality of lateral extensions T, three being. shown in the present instance,

and at the outer ends of the extension are spring ar'ms U which are curved to correspond to the =curv'e of the body portion R and with respect -to which they are suitably spaced. Preferably 'theouter diameter of the spring plate, that is, from the outer edge of one spring arm to another, taken through the median line of the Spring plate, substantially equals the diameter spring arms heretofore proposed and wherein the spring arms were merely bent out of the plane of the spring plate so that the armsineffect were straight uncurved members, and.

which members, upon the application o-j pressure to the free ends thereof, would merely yield or bend at the point or angle at which they joined the normal portions of the springplate.

In order that the bending movement of the arms U may not be confined to. oneparticular region of the arms, as is customary in devices of this character as heretofore constructed, said arms are preferably of the samewidthand thickness and consequently of the same cross sectional area throughout their lengths.

In practice, assuming the parts comprisingthe valve mechanism to be suitably assembled and arranged in the compressor and in the case of a discharge valve, such as that illustrated, the fluid being compressed will act against the surface of the valve plate J adjacent the ports K and will unseat the valve plate, whereupon the fluid being compressed will be discharged from the compressor.

During the initial movement of the valve plate, said valve plate will encounter'comparatively light resistance by the spring fingers U.- This is due to the fact that the spring fingers are of. considerable length. As the valve plate J appreaches an intermediate position in the space G, for instance as illustrated in Figure 6, the

spring arms U will be raised in the direction of the stop plate C wherewith they willcontact at a point intermediate their ends as for instance that designated by W in Figure 6.

In mechanisms wherein the spring plate Q is capable of free movement relatively to the, stop plate C this upwardly applied pressure of the valve plate against the free ends of the spring fingers will result in drawing the spring plate bodily in'the direction of the valve plate J.

It follows therefore that, asthevalve plate J approaches the end of its unseating movement, the attached ends of the arms U are ,moved free of the. stop plate C to meetand contact with the approaching valve plate J. Thereafter the portions of the arms lying on oppositesides of what'may be termed the initial point of contact or fulcrum W will be gradually rolled'back against the stop plate, thus increasing the areas of contact between the arms U both in the direction of the free ends andthe attached ends of said arms. In consequence, the unsprung portions of the arms U are gradually diminished.

' i Owing to this fact a relatively greater resistance is offered by the ends of the arms to the valve plate during the final unseating movement thereof than is exerted by the. arms during the initial unseating movement of the valve. plate.

.- act'as a stop therefor, for example, thespring plate, as Well as thesharp impact of the spring plate against the stop plate C.

stop plate C, thus gradually shortening the comparatively short radius or of an extent which subsequent unseating movement of the spring .ing ,portstherein, a stop'plate, a valve platei? It may be desirable in some forms of usage to avoid movement of portions of the spring plate other than the spring fingers. In such case, of course, only the resistance of those portions of the arms U lying entirely on one side of the extensions T would serve to resist or cushion the opening movement of the valve plate J. With only the arms U- capable of movement, said arms Will be rolled along the surface of the unsprung portions of said arms and in this way assuring maximum cushioning pressure of the arms on the valve plate J during the final opening movement of the said valve plate.

In the modified. form of spring plate shown inFigures 8 and 9 and designated by X, the spring arms Z have reversely curved portions :2) andc. The curved portions 1), which are those adjacent the lateral extensions T, may be of will carry the adjacent part of the curved portions 0 above or to one side of the main body portion R. of the spring plate. are then gradually curved on a larger radius The portions 0 prompt depressions of the attached portions of the spring arms during the initial unseating movement of the valve plate J. Moreover, this form of the invention is also particularly applicable for use in valve mechanisms wherein high lift of the valve plate J may be essential.

The cushioning efiect, however, of the spring plate X, or, more specifically, the arms Z, is

inall essential respects like that of the spring plate Q, that is, in the case of a free floating spring plate X the force exerted by the valve plate J against the free ends (1 of the fingers Z Will tend to move the attached ends or portions -.o'the arms in the direction of the valve plate to contact therewith. The arms Z will then contact with the stop plate at a point intermediate the ends of the arms, and during the l 5 plate J the portion of the arms Z lying on the opposite sides of the point of initial contact of the arms Z with the stop plate will be rolled back so that as the unsprung portions of the arms Z decrease, the cushioning effect thereof .Will increase correspondingly.

I claim:

1. A plate valve comprising a valve seat hav- .ing ports therein, a stop plate, a valve plate-o3.

reciprocable between the valve seat and the stop plate to control the ports, a spring plate movably disposed between the valve plate and the by intermediate portions of the arms seat against the'stop plate upon the initial opening -movement of the valve plate and the portions if? of the arms lying on opposite sides of said inl :termediate portions cushion the subsequent or final opening movement of the valve plate.

2. A'plate valve comprising a valve seat hav- Ieciprocable between the valve seat and the stop plate to control the ports, a spring plate between the stop plate and the valve plate, and spring arms on the spring plate of uniform cross-sectional area throughout their lengths and constantly pressing with one end against the valve plate, said arms being bent out of the plane of the spring plate and curved throughout their lengths, whereby the intermediate portion of each arm is raised above the ends of said arms to initially seat against the stop plate and the portions of the arms lying on opposite sides of said intermediate portions of initial contact cushion the subsequent or final opening movement of the valve plate.

3. A plate valve comprising a valve seat having ports therein, a stop plate, a valve plate reciprocable between the stop plate and the valve seat to control the ports, a spring plate movably disposed between the valve plate and the stop plate, means for holding the stop plate in spaced relation with respect to the valve seat and to guide the valve and spring plates, and curved arms attached at one end to the spring plate constantly bearing with the other end against the valve plate, said arms being of uniform cross-sectional area throughout their lengths whereby upon the initial opening movement of the valve plate an intermediate portion of each arm will seat against the stop plate and the attached. ends of the arms will be moved in the direction of the valve plate to assist the free ends of the arms in cushioning the final opening movement of the valve plate.

4. A plate valve comprising a valve seat having ports therein, a stop plate, a valve plate reciprocable between the stop plate and the valve seat to control the ports, a flat spring plate reciprocable between the valve plate and the stop plate and having a bore, spring arms on the spring plate concentric therewith and having free ends pressing against the valve plate and being initially curved out of the plane of the spring plate throughout their lengths and in a continuous curve whereby during the unseating movement of the valve plate the area of contact between the spring arms and the stop plate will gradually increase and the unsprung portions of the arms will correspondingly decrease toward both extremities of each spring arm to effect maximum cushioning pressure on the valve plate during the final unseating movement thereof, and. a spacer between the valve seat and the stop plate extending through the bore in the spring plate to guide said spring plate.

5. A plate valve comprising a valve seat having ports therein, a stop plate, a valve plate reciprocable between the stop plate and the valve seat to control the ports, a spring plate between the stop plate and the valve plate and having an inner annular body portion, lateral extensions on the body portion, spring arms connected at one end to the extensions and being arranged concentrically with respect to the body portion, said spring arms being spaced with respect to the body portion, and being curved continuously from one extremity to the other whereby, upon the application of pressure to the free ends of the spring arms, the intermediate portions of the spring arms are raised above the extremities of said arms to initially seat against the stop plate and the portions of the arms lying on the opposite sides of the point of initial contact cushion the subsequent movement of the valve rection of the stop plate.

6. A plate valve comprising a valve seat having ports therein, a stop plate, a valve plate reciprocable between the stop plate and the valve seat to control the ports, a spring plate between the valve plate and the stop plate and having lateral extensions thereon, and spring arms on the lateral extension and being arranged concentrically with respect to the spring plate, said arms comprising comparatively long continuously curved portions extending through the transverse plane of the spring plate and short reversely curved portions between the long portions and the extensions.

WILLIAM E. BEBBINGTON.

plate in the di

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