US2328420A - Compressor - Google Patents

Description

1943- w. R. BROWN ET AL 2,328,420

COMPRESSOR Filed July 29, 1940 2 Sheets-Sheet l Aug. 31, 1943.

w. R. BROWN ET AL 2,328,420

COMPRESSOR Filed July 29, 1940 2 Sheets-sheaf 2 Patented Aug. 31, 1943 COMPRESSOR William R. Brown, Chicago, and Nigel J. Collings,

Elmhurst, Ill., assignors to W. R. Brown Corporation, Chicago, 111., a corporation of Illinois Application July 29, 1940, Serial No. 348,263

4 Claims.

The invention relates to air or gas compressors and has as its general aim the provision of a machine of this nature which is simple in constructlon, eiiicient in operation, and inexpensive to manufacture.

Another object of the invention is to provide a novel construction whereby economical manufacturing processes, such for example as die castings or stampings, may be largely used with entirely satisfactory results.

Another object is to provide new and improved supporting means which substantially eliminates vibration and noise.

A further object is to provide a novel means for supporting the movable parts of a compressor unit in the casing which is particularly advantageous where the casing is a die-cast or stamped structure.

Another object is to provide a new and improved casing in which the casing is formed of longitudinally divided half-sections arranged to be secured together in a novel manner.

Other objects and advantages will become apparent in the following description and from the accompanying drawings, in which:

Figure 1 is a View primarily in side elevation but partially in axial section of a compressor embodying the features of the invention.

Fig. 2 is a transverse sectional view taken along the line 2-2 of Fig. 1.

Fig. 3 is a view of a detail of assembly as seen from the line 33 of Fig. 2.

Fig. 4 is a disassembled view of the casing of the compressor in Fig. 1.

Fig. 5 illustrates fragmentarily a compressor having a modified form of casing.

With reference to the drawings in which an exemplary form of diaphragm type of compressor is shown, the numeral Ill designates a casing which houses the operative elements of the compressor and carries a head II in which the air or gas flow controlling means is located. In the present embodiment the casing Id is a die cast or stamped structure fashioned, as shown in Fig. 4, of two semi-cylindrical sections l2 and [3. The sections are complemental and when secured together form a tubular casing having open ends. It will be evident that the sections may be other than semi-cylindrical in shape.

Means is provided on the casing sections for definitely locating the sections in proper relationship during assembly. Thus, one longitudinal margin of each section has an outstanding projection I4 located on the circular plane of thesection and arranged for interfitting engagement with a complemental recess I5 in the meeting edge of the other section. Near one end of each section (in this instance the lower end, Fig. 4) each longitudinal marginal portion has an outstanding lug or finger l6 thereon located within the circular plane of the sections and arranged to extend into overlapping relation to the marginal edge portions of the opposite section. As shown, the lugs on the opposed margins are not alined, but are offset to the extent that in assembly the lugs on one section have a side abutting relation with the lugs on the opposite section. The interconnecting elements on the casing sections facilitate assembly by locating the parts in proper operative relationship and, after assembly, the elements tend to maintain such relationship.

The sections may be positively secured together in any suitable manner as by traversing bolts. A particular form of securing means for the lower portion of the structure is shown in Figs. 1 and 4. Thus, each section has near its lower end a radial inwardly extending tubular member l1, [3 which opens through the wall of its casing section and tapers inwardly. The members as shown meet approximately on the axis of the easing and preferably have an abutting relation. The ends may also be caused to interfit as by reducing the diameter of the end portion of one member, herein the member 17, to provide an endwise facing annular shoulder I9 and an end portion receivable in the end of the opposite member [8. The tubular members are united by suitabl securing means, such as the headed bolt and nut 2|, which, when they are respectively inserted in the tubular members, engage the tapering internal walls to insure that the sections will be rigidly drawn together. Preferably, one of the members, for instance the member [2, has an internal annular flange 22 providing a seat for a nut of small diameter.

The opposite or upper ends of the casing sections are secured together as by means of pairs of outstanding opposed flanges 23 apertured, asat 24, to receive a bolt or like securing means (not shown). Similar means may, if desired, be used at the lower portion of the casing in lieu of the members ll, [8. The upper edges of the casing sections have outstanding flanges 25 appropriately bored and tapped to receive screws 28 (Fig. 1) for securing the head I l to the casing. Spaced inwardly a short distance from the upper end of each casing section is a comparatively shallow outwardly facing annular shoulder 21, the purpose of which will be presently described.

One of the casing sections, herein the section l3, has an annular flange 0r boss 28 cast thereon forming a part of a bearing assembly 29 (Fig. '1) for a drive shaft 30 and a driven shaft 3!. The compressor unit, as a whole, is supported almost wholly by the drive shaft 30, which shaft is usually the armature shaft of a driving motor (not shown). The driven shaft carries a crank 32 which includes an eccentric crank pin 33 for engagement with the lower end of a connecting rod 34. The upper end of the connecting rod terminates in a flat head 35 for supporting a piston 36. A pull plate 31 carries an axially located screw 38 which extends through the piston into engagement with the connecting rod head 35 to secure these parts together. Marginally the pull plate engages the inner margin of an apertured flexible diaphragm 35 to bind the diaphragm against an opposed surface of the piston.

The annular shoulder 2'5 is in the nature of :a ledge which provides a seat for a smoothly finished member which traverses th meeting lines of the sections and provides a continuous, smooth surface for coaction with the movable elements of the compressor represented in the present exemplary structure by the diaphragm. As shown in Figs. 1 and 4, this member is an annular member 48 having a part dimensioned to seaton the ledge. In the presentinstance, the upper or outer face of the member terminates a short distance from the upper end edges of the casing sections, but otherwise the axial length thereof is as desired. In the diaphragm-type compressor the outer margin of the diaphragm 39 extends into overlying relation'to theouter :t'a-ceof the ring within th confines of the casing sections and is there fixed by the peripheral engagement (therewith of a concave or cup-shapedfixed valve bridge or head '41 which is, in turn, held-against thediaphragrn "by a rim '42 on the head M. It Will be noted that the ring 41! provides a continuous, unbroken support for the operating structure ofthe compressor and. in area-sing composed of longitudinally divideds'ections, the ring traverses the gaps or spaces between the meeting :edges of the sections to prevent leakage of tail or gas from the chamber 4-3 between the flexible diaphragm 3 9 and fixed bridge or head 51.

The head vI l ishollow and wit-lithe valve go 41 defines a space M with which anoutlet 45 for compressed air orgas communicates. The bridge 4'! carries'a suitable air or gas :inlet valve 4% and outlet valve 4:! which valves, respectively, are check valves to permit a flow of air or gas into the chamber '43 on the intake stroke of the piston and, thence, .onthe exhaust stroke throughoutlet valved! into the space M; If .desiredza safety valve 43 be provided on the head in cornmunication'with the space "M.

Since the compressor 'unit is primarily supported by the drivingshaftfiil. means is'provided for preventing the rotation of the compressor unit with the shaft. In the {present instance, the ro tation preventing means includes means for dampening or absorbing the vibrations resulting from operation of the device. Referring to .1, the numeral 45 designat s-a continuation of the base on which the :dri mg motor i mounted. The base mayhoweveiz'be aseparate fixed i-part. Secured on the base, and substantiall in axial alinement with the casing H3, sis a sleeve 51 di-- Jnensio-ned to encircle the lower portion of the .cas'mginzspeced relation thereto. A band =El of rubber or other suitable pliable, resilient material is interposed between t. e sleevet l and the casing 18. Thexparts'areso dimensioned that the lower :end the "casing maymoveto a limited extent :vz'ithout rooting into contact with the wallof the sleeve. o-t .tion'of di -casi g is'thereby prevented, yet the casing imay vibrate-as .the com- :pzressor operates without transmission of .such vibrations to the's'leeve and thence to the base. Hence, noise and vibration -:are substantially elimin ted. It maybe noted that the telescoprelationof the sleeveaand casingand the-gen- -erallyiintermediate position-of the band '51, permits 0f relativezaxialiadjustment through a conisiderable distance.

Referring to Fig. 5, the casing illustrated therein differs from the casing previously described in that it has on both section internal bearing supports tit for the crank shaft which are alike. Thus, a single die may be employed for both casing sections whether the compressor be one which ha a single piston or one having a pair of angularly related piston driven from a comncraniz. The casing structure shown in Fig. lay also be die cast as a single unitary mem- While in this case the casing would have 2110 meeting edges, as in the case of a sectional casing. the single structure does not readily lend itself to "the formation in the die casting operati l of .a shoulder or ledge of sufiicieni; width to a ford adequate supDGrt to theoperating structure. A narrow ledgeindicated at 5.2 and corresponding to the ledge 21 on the sectional casings, may, however, be formed without difficul-ty. Conseou n -y, in the single diecaststructure, a ri g i comparable to the ring 45!, is :seated tn the ledge 52 tovsupporting, as shown, the cuterina of the flexible diaphragm 3B. The remaining structure of thecompressorillustrated inFi-g. :5,'is substantially the same as that shown in Figs; 1 to l.

While the invention is susceptible of various modifications alternative constructions, we .have shown in the drawings and have herein described in detail :thepreferred embodiment, but .itis to be understood that-we do not thereby intend to limit the invention to the specific form disclosed, but intend to cover all modifications and alternative constructions falling within the spirit and scope of the invention as expressed in the appendedzclaims.

We cla-im as-onr invention:

'1. A casingor a compressor having, incombination, semi-cylindrica-l, :die-c'as-t "casing sections means for-securing said sectionstogether including a .member --on each section extending radially oward the axis thereof, "said :inembers bein a,- anged for 'en'd-to-rendregistration, and

ror connecting said members together.

2. A casing for a compressor having, :in combination, casing sectionsmeans for securing said section's together including radially extending inwardly tapering tubular rnembersion said sections arranged for end-'t'o-end.interengagement, connecting means seated in ssaid members and gaging the Walls thereof itoritsecuring said members together.

3. Acasing for :a compresscrhavingdn combination, semi-cylindrical die cast casing sections, and 'means for securing said'sections together including :fing'ers on each section extending :into overlapping marginal engagement with the 70pposits section, .and interfittingmotches and lips on the meeting edges of saidsecti'ons.

3. In a compressor of thgcharacter described, the combination or .a casing :fo'mred of semicylindrical mating casing sections fitting together along longitudinal :lines, m'eans ier-securin isa id sections together, -:a separate r-ingata'one-end of said casingsubstantially concentric therewith andproviding a continuous supporting surface "at said end and across the lines' of division between the casing sections, a compressor :means associated with :said casing includinga fdriven cl-iaph-ragin abutting said ring, .and'a casing end section secured to :said casing .and binding said diaphragm against said :ring.

R. BROWN. NIGEL J. CQLLINGS.

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