US2117601A

US2117601A - Compressor structure

Info

Publication number: US2117601A
Application number: US94930A
Authority: US
Inventors: Lindsay H Browne
Original assignee: KELLOGG COMPRESSOR AND Manufacturing COR
Current assignee: KELLOGG COMPRESSOR AND Manufacturing COR; KELLOGG COMPRESSOR AND MANUFACTURING Corp
Priority date: 1936-08-08
Filing date: 1936-08-08
Publication date: 1938-05-17
Anticipated expiration: 1955-05-17

Description

May 17, 193 8. L. H. BROWNE 2,117,601

I COMPRESSOR STRUCTURE 3 Filed Aug. a, 1936 INVENTOR l ind sa y IZBrawne.

VMM'i ATTORNEYs Patented May 11, 1938 UNITED STATES PATENT OFFICE 7 2,117,601 COMPRESSOR- STRUCTURE Application August s, 1936, Serial No. 94,930

3 Claims.

, This invention relates to improvements in compressor structures. u

An object of the invention is to provide an improved piston structure. 4

Another object of the invention is to provide a piston and .connecting rod structure suitable for use in compressors and including improved means of joining the rod and piston.

Still another object is to provide a structure of the above type in which the wrist pin is secured without the use of bosses -in the piston barrel, and in which working of the wrist-pin into contact with the cylinder wall is rendered impossible.

A further object isto provide a structure of the above character including a suction valve on the piston, the valve, piston and connecting rod being fastened together by a single securing means.

Another object is to provide an improved oil baffle in the piston.

A still further object is to provide a structure of the above type which may be cheaply, easily andaccurately manufactured.

Other objects and advantages of the invention will become evident during the course of the following description in connection with the accompanying drawing in which:

Figure 1 is a vertical sectional view showing the piston and upper end of the connecting rod in place in a suitable compression cylinder;

Figure 2 is a vertical sectional view showin the parts separated to illustrate the assembly;

Figure 3 is a side elevation of the piston barrel;

Figure 4 is a top view of the same;

Figure 5 is a side elevation of the ring plate valve; 3 1

Figure 6 is a plan view of the same;

Figure 7 is a detail side elevation of the connecting rod and trunnion structure; and

Figure 8 is a top view of the trunnion member.

traldischarge passage l6 through the plate H iscontrollable by an upwardly opening spring leaf valve ll of a type fully described and claimed in the above-mentioned application.

A piston I8 is slidable in the cylinder lland is adapted to be reciprocated by any suitable type of crank (not shown) through the medium of a connecting rod IS. The body of the piston consists of a cylindrical barrel 20 shown in detail in Figure 2, and having a flat head 2| pierced by a central hole 22. The outer face 23 of the head 2| has therein an annular groove 24 from which holes 25 lead into the interior of the barrel 20. A forked member 26, shown in detail in Figures 2, '7 and 8,-has cylindrically curved side legs 21' and 28 adapted to fit accurately, in the cylindrical interior of the barrel 20. .A short cylindrical boss 29 on the top of the member 25 is adapted to engage the inner face of the head 2|, and a central hole 30 through the boss 29 is tapped to-accommbdate a clamping screw 3|,- Figures 1 and 2.

A hollow wrist pin 32, supported-in the

legs

21 and 28, has rotatably mounted thereon a bushing 33 in the upper end 34 of the connecting rod l9. An oil hole 35 is provided through the top of the rod-end 34 and bushing 33. The lower end 36 of the rod I9 has secured thereto an oil splasher 3'! and is lined with a bushing 38 having grooves 39 adapted to receive lubricant through an inclined oil-hole 40. The upper end 34 of the connecting rod and the bushing 33 may be made with a running fit between the inner surfaces of the

legs

21 and 28, the latter thus preventing side-play of the connecting rod.

In assembly, the member 26 is inserted in the barrel 20, 'the tapped hole 36 registering with the hole 22 in the piston head 2|. A ring plate 4| of thin metal, shown in detail in Figures 2, 5 and 6, is placed on the flat upper face 23 of the head 2| so as to overlap both the inner and outer edges of the annular groove 24. A narrow spacer washer 42, slightly thicker than the ring plate 4|, and of outer diameter slightly less than the inner diameter of the ring plate, is placed within the latter on the face 23. The clamping screw 3i, which has a cylindrical head 43 larger than the inner diameter of the spacer washer 42, is inserted through the washer 42 and hole 22 and screwed tightly into the threaded hole 30 in the forked member 26. The latter member, carrying the wrist pin 32 and attached connecting rod I! as previously explained, is firmly clamped against the inside of the head 2|, while the spacer washer 42 is clamped between the screw-head 43' and the face '23.

The overlapping screw-head 43 retains the rin'g-plate ll on the piston, and the washer 42 acts as a concentric guide for the plate. Due to the fact that the washer is slightly thicker than the plate 4|, the latter is allowed a small vertical play under the screw head 43. The plate thus constitutes a valve normally closing the groove 24. During the suction or the downward stroke of the piston 20 in the cylinder l gas passes upward through passages 44, Figure 8, between the flattened vertical faces 45 of the member 26 and the bore of the barrel 20 into the annular space46, Figure 1, around the boss 29, from which it passes through the holes 25 into the groove 24, raising the ring plate valve 41 and entering the cylinder around the periphery of the valve.

While the ring platevalve, 4| ismade of thin metal, as stated, the full portage aroundthe entirecircumference of the valve allows ample valve opening within the small free rise provided by the use of the spacer washer 42, so that normally no flexing of the valve plate is necessary. The large inlet area, lightness of the valve plate and limited movementof the latter allow the valve to operate positively, quietly and with a minimum of resistance to the flow of fluid, making it especially adapted to high speed compressor operation at high volumetric efliciency.

The exact valve lift desired may readily be secured in manufacture by making the washer 42 of material thicker than the material of the ring plate valve 4| by the amount of the desired lift. It is obvious that if desired, however, the screw 3| may be made with an integral shoulder taking the place of the washer 42.

To prevent an undue amount of lubricant being carried into the inlet passage, a .baiile 41, Figures -1 and 2, is disposed in a-groove 48 in the lower part of the barrel 20.. This baille 41 is preferably made in the form of a disc of resilient sheet metal having a slot 49, Figure 2, to accommodate the connecting rod l9, and split at one point 59 to allow the battle to be sprung around the rod andsnapped into place in the groove .48. External 011 grooves such as 52 and 53 may be provided on the barrel 20, serving to regulate the supply of lubricant to the cylinder walls and to aid in sealing the piston against leakage of pressure.

From the foregoing description it is evident that the invention comprises a simple structure inwhich the piston, the connecting rod attaching means and the inlet valve are secured accurately in proper mutual relation by the single clamping screw 3|. The individual parts are simple and lend themselves to easy and uniform manufacture by automatic or semi-automatic machinery.

The barrel 20 may readily be. made from bar stock or the like, due to its lack of internal bosses VVl1ile the invention has been described in preferred form it is not limited to the exact structures illustrated, as various modifications may be made without departing from the scope of the appended claims.

What is claimed is:

1. In a compressor, a piston structure comprising in combination a cylindrical barrel having a head, said head being formed with inlet passages therethrough, a, valve on said head adapted to control said passages, a forked member in said barrel and engaging said head, a wrist-pin in said forked member, the cylindrical wall of saidbarrel closely embracing the sides of said forked member whereby said wrist-pin may be retained therein, and common means to retain said valve on said head and to secure said forked member in said barrel.

2. A piston structure comprising in combination, a cylindrical barrel, a flat head on said barrel, said head being formed with an annular groove in the outer face thereof and a plurality of passages from said groove into the interior.

of said barrel, 9. ring plate valve disposed on said head and overlying said groove, a-forked member in said barrel, a wrist pin in said forked member, a screw extending through said head and threaded into said forked member'to secure the same in said barrel, said screw having a head overlapping the inner edge of said-ring plate valve, and spacing means under said screw head and within said ring plate valve, said spacing means being thicker than said-valve whereby said valve may have play between said outer face and said screw head.

' 3. A piston structure comprising a cylindrical barrel having an internal groove formed therein,