US20180291885A1 - Valve plate and head cover assembly - Google Patents
Valve plate and head cover assembly Download PDFInfo
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- US20180291885A1 US20180291885A1 US15/481,241 US201715481241A US2018291885A1 US 20180291885 A1 US20180291885 A1 US 20180291885A1 US 201715481241 A US201715481241 A US 201715481241A US 2018291885 A1 US2018291885 A1 US 2018291885A1
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- Prior art keywords
- valve plate
- head cover
- chamber
- cylinder
- face
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
- F04B39/1066—Valve plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/005—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders with two cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B27/0404—Details, component parts specially adapted for such pumps
- F04B27/0423—Cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B27/0404—Details, component parts specially adapted for such pumps
- F04B27/0451—Particularities relating to the distribution members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/04—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B27/053—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with an actuating element at the inner ends of the cylinders
- F04B27/0536—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with an actuating element at the inner ends of the cylinders with two or more series radial piston-cylinder units
- F04B27/0538—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with an actuating element at the inner ends of the cylinders with two or more series radial piston-cylinder units directly located side-by-side
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
- F04B39/0061—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using muffler volumes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/121—Casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/123—Fluid connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/125—Cylinder heads
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
Abstract
Description
- The present disclosure relates to compressors and pumps and, more particularly, to an improved head assembly for a compressor or pump.
- In one embodiment a multi-cylinder compressor or pump is provided, including a first cylinder housing having a first bore, a second cylinder housing having a second bore, a motor having a drive shaft, a first piston coupled to the drive shaft and received in the first bore, and a second piston coupled to the drive shaft and received in the second bore. The multi-cylinder compressor or pump further including a valve plate including a first cylinder portion, a second cylinder portion, and a third portion positioned between the first cylinder portion and the second cylinder portion. The valve plate further including a valve plate face with a first aperture extending through the first cylinder portion and a second aperture extending through the second cylinder portion. The first cylinder portion of the valve plate being coupled to the first cylinder housing and the second cylinder portion of valve plate being coupled to the second cylinder housing such that the first aperture is in fluid communication with the first bore and the second aperture is in fluid communication with the second bore. The multi-cylinder compressor or pump further including a head cover including a head cover face, and at least one wall extending from one of the valve plate face and the head cover face to form a channel. The head cover is coupled to the valve plate such that the channel cooperates with the other of the valve plate face and the head cover face to form a chamber extending between and enclosing the first aperture of the first cylinder portion and the second aperture of the second cylinder portion of the valve plate.
- In one embodiment a head assembly for a multi-cylinder compressor or pump having a first cylinder and a second cylinder is provided, including a valve plate including a first cylinder portion, a second cylinder portion, and a third portion extending positioned between the first cylinder portion and the second cylinder portion. The valve plate further including a valve plate face with a first aperture in the first cylinder portion and a second aperture in the second cylinder portion. The head assembly further including a head cover having a head cover face, and at least one wall extending from one of the valve plate face and the head cover face to form a channel. The head cover being configured for coupling to the valve plate such that the channel cooperates with the other of the valve plate face and the head cover face to form a chamber extending between and enclosing the first aperture of the first cylinder portion and the second aperture of the second cylinder portion of the valve plate.
- In one embodiment a multi-cylinder compressor or pump is provided, including a first cylinder housing defining a first bore and a second cylinder housing defining a second bore. The multi-cylinder compressor or pump further includes a head assembly couplable to the first and second cylinder housings. The head assembly includes a valve plate and a head cover configured to cooperate to form a chamber in fluid communication with the first and second bores. The valve plate is positioned over both the first and second bores.
- Other features and aspects of the disclosure will become apparent by consideration of the following detailed description and accompanying drawings.
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FIG. 1 is a perspective view of a compressor. -
FIG. 2 is a cross-sectional view of the compressor ofFIG. 1 taken along line 2-2. -
FIG. 3 is a partially exploded view of the compressor ofFIG. 1 . -
FIG. 4 is an exploded view of a head assembly of the compressor ofFIG. 1 . -
FIG. 5 is a top view of a valve plate of the head assembly ofFIG. 4 . -
FIG. 6 is a bottom view of a head cover of the head assembly ofFIG. 4 . -
FIG. 7 is an enlarged cross-sectional view of the compressor ofFIG. 1 taken along line 7-7. -
FIG. 8 is an enlarged cross-sectional view of the compressor ofFIG. 1 taken along line 8-8. -
FIG. 9 is an enlarged cross-sectional view of the compressor ofFIG. 1 taken along line 9-9. -
FIG. 10 is a partially exploded view of another head assembly. -
FIG. 11 is a top view of a valve plate of the head assembly ofFIG. 10 . -
FIG. 12 is a bottom view of a head cover of the head assembly ofFIG. 10 . -
FIG. 13 is a cross-sectional perspective view of the head assembly ofFIG. 10 . -
FIG. 14 is another cross-sectional perspective view of the head assembly ofFIG. 10 . -
FIG. 15 is a partially exploded view of another head assembly. -
FIG. 16 is a top view of a valve plate of the head assembly ofFIG. 15 . -
FIG. 17 is a bottom view of a head cover of the head assembly ofFIG. 15 . -
FIG. 18 is a cross-sectional perspective view of the head cover ofFIG. 22 taken along line 18-18. -
FIG. 19 is a cross-sectional perspective view of the head cover ofFIG. 15 taken along line 19-19. -
FIG. 20 is a cross-sectional perspective view of the head cover ofFIG. 15 taken along line 20-20. -
FIG. 21 is a perspective view of another compressor. -
FIG. 22 is a cross-sectional view of the compressor ofFIG. 21 taken along line 22-22. -
FIG. 23 is a partially exploded view of the compressor ofFIG. 21 . -
FIG. 24 is an exploded view of a head assembly of the compressor ofFIG. 21 . -
FIG. 25 is another view of the head assembly ofFIG. 24 . - Before any embodiments of the disclosure are explained in detail, it is to be understood that the disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The disclosure is capable of supporting other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
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FIG. 1 illustrates amulti-cylinder air compressor 10 for oxygen concentration including ahousing assembly 14 and ahead assembly 18. Thehousing assembly 14 includes a circular cylindrical thin wall spacer ormotor sleeve 22 betweenend housings 26 that correspond to first andsecond cylinders compressor 10. Theend housings 26 are preferably formed of a cast material, such as aluminum. Themotor sleeve 22 hasperforations 38 adjacentopposing ends 42 of themotor sleeve 22 for purposes of air flow. Thehead assembly 18 includes avalve plate 50 and a head manifold orhead cover 54 and may further include a pair of pressure swing absorption oxygen concentrators (not shown) mounted on thehead cover 54 for separating oxygen and nitrogen from compressed air. - With additional reference to
FIG. 2 , thecompressor 10 further includes anelectric motor 62 having a throughdrive shaft 66 encircled by themotor sleeve 22. Each of theend housings 26 includes acircumferential flange 70 having arelief 74 so as to receive theopposing ends 42 of themotor sleeve 22 to join theend housings 26 to themotor sleeve 22.Bearings 78 support thedrive shaft 66 of themotor 62. - With continued reference to
FIGS. 2 and 3 , each of theend housings 26 includes acylinder extension 86 for each of thecylinders compressor 10. Thecylinder extension 86 has asupport floor 90 that supports acylinder sleeve 94 defining abore 98. Thesupport floor 90 has an opening 102. Thecylinder extension 86 hassidewalls 106 that terminate inhousing bosses 110 to support and mount the valve plate 50 (FIG. 3 ). An O-ring 114 is mounted to thevalve plate 50 between thevalve plate 50 and a top edge of thecylinder sleeve 94 to seal the top edge of thebore 98. - The
compressor 10 further includes apiston 122 and an eccentric 126 associated with each of thecylinders distal end 130 of thedrive shaft 66. More specifically, therod 134 of eachpiston 122 is mounted on abearing 138 supported by the eccentric 126 such that the axis of the eccentric 126 is offset from that of thedrive shaft 66. The eccentric 126 includes acounterweight 142. Apiston 122 is positioned within eachbore 98 of thecylinder sleeve 94 such that therod 134 of thepiston 122 extends through the opening 102 in thesupport floor 90. Thepiston 122 includes aperipheral seal 146 that seals with thebore 98 of thecylinder sleeve 94. - A
fan 150 is mounted on each of the distal ends of thedrive shaft 66 within the hollow interior of theend housings 26 in order to draw air into theend housings 26 as themotor 62 rotates to cool themotor 62. Air may also be forced through theopening 102 in thesupport floor 90 to cool thecylinder sleeve 94 and thepiston 122. - With further reference to
FIG. 3 , thevalve plate 50 of thehead assembly 18 includes first andsecond cylinder portions second cylinders middle portion 170 connecting the first andsecond cylinder portions cylinders portions support bosses 174 corresponding with and supported by thehousing bosses 110 on theend housings 26. - The
head cover 54 includes first andsecond cylinder portions second cylinders middle portion 194 therebetween. Each of thecylinder portions bosses 198 supported by thesupport bosses 174 of thevalve plate 50.First fasteners 210 are threaded through the mountingbosses 198 of thehead cover 54, thesupport bosses 174 of thevalve plate 50, and into thehousing bosses 110 to couple thehead cover 54, thevalve plate 50, and thehousing assembly 14.Second fasteners 214 are threaded throughmiddle bosses 178 on themiddle portion 170 of thevalve plate 50 and correspondingmiddle bosses 180 on themiddle portion 194 of thehead cover 54 to provide additional clamping force between thehead cover 54 and thevalve plate 50 to prevent gas leakage around the location at which themiddle portions head cover 54 and thevalve plate 50 meet when coupled together. - With reference to
FIG. 4 , each of the first andsecond cylinder portions head cover 54 includes asieve bed seat 222 for mounting each of the pressure swing absorption oxygen concentrators (not shown) and anoxygenator manifold 226. A solenoid valve (not shown) is mounted on each of theoxygenator manifold 226 for controlling air flow to the oxygen concentrators and purged nitrogen flow out of thecompressor 10. - With reference to
FIGS. 4-5 , thevalve plate 50 includes a valve plate face ortop surface 234 that extends across the first andsecond cylinder portions middle portion 170. Thetop surface 234 definesgrooves 238 comprising anouter groove 242 that extends around the perimeter of thevalve plate 50, aninner groove 246 that extends on thetop surface 234 within a perimeter of and concentric with theouter groove 242, and connectinggrooves 250 that connect theinner grooves 246 and theouter grooves 242 within the first andsecond cylinder portions grooves 238 support acircuitous gasket 252 made of rubber or another suitable sealing material and define anintake section 254, anexhaust section 258, and a purge ormuffler section 262. Theintake section 254 and theexhaust section 258 are defined by thegrooves 238 so as to be continuous between thefirst cylinder portion 162, themiddle portion 170, and thesecond cylinder portion 166. Theinner groove 246 defines themuffler section 262 so as to extend across themiddle portion 170, such that theinner groove 246 and the connectinggrooves 250 bisect theouter groove 242 along a horizontal centerline A extending longitudinally between the first andsecond cylinder portions intake section 254 and theexhaust section 258 are on opposite sides of themuffler section 262 and the connectinggrooves 250. In alternative embodiments, a single groove may bisect theouter groove 242 along the horizontal centerline A so as to only define theintake section 254 and theexhaust section 258, in lieu of a muffler section 262 (i.e., similar to center groove 478 ofFIGS. 15-20 ). - The
valve plate 50 includes anintake port 270 that communicates with theintake section 254 at anintake opening 272. Thevalve plate 50 further includes abore inlet aperture 274 defined in and extending through each of the first andsecond cylinder portions cylinders intake section 254. Each of thebore inlet apertures 274 has a corresponding boreinlet flapper valve 278 to allow intake air to enter the cylinder bores 98 from theintake section 254, but not vice versa. Thevalve plate 50 further includes abore outlet aperture 282 defined in and extending through each of the first andsecond cylinder portions cylinders exhaust section 258. Each of thebore outlet apertures 282 has a corresponding boreoutlet flapper valve 286 to allow exhaust air to exit the cylinder bores 98, but not vice versa. Theexhaust section 258 also has a safetyvalve support recess 290 that receives a pressure relief or safety valve 294 (FIG. 3 ). Themuffler section 262 includes anexhaust port 298, located centrally within themuffler section 262 through thetop surface 234 of thevalve plate 50. - With reference to
FIG. 6 , thehead cover 54 includes a head cover face or innerbottom surface 306 and a series of continuous dividers orwalls 310 that correspond to thegrooves 238 of thevalve plate 50 and extend generally perpendicularly downward from thebottom surface 306 of thehead cover 54. The series ofwalls 310 includes anouter wall 314 extending around the perimeter of thehead cover 54, aninner wall 318 within theouter wall 314, and connectingwalls 322 connecting theinner wall 318 and theouter wall 314 in the first andsecond cylinder portions head cover 54. Theinner wall 318 includes first andsecond portions walls 310 extend from thebottom surface 306 so as to form anintake channel 326, anexhaust channel 330, and a purge ormuffler channel 334. Like thegrooves 238 of thevalve plate 50, theinner wall 318 defines themuffler channel 334, such thatinner wall 318 and the connectingwalls 322 divide theouter wall 314 along a horizontal centerline B extending longitudinally between the first andsecond cylinder portions intake channel 326 and theexhaust channel 330 are located on opposite sides of themuffler channel 334 and the connectingwalls 322. In alternative embodiments, the connectingwalls 322 may extend along the horizontal centerline B and meet to form a single wall that bisects theouter wall 314 so as to define theintake channel 326 and theexhaust channel 330, in lieu of a muffler channel 334 (i.e., similar tocenter wall 482 ofFIGS. 15-20 ). - The series of
walls 310 cooperate with thegrooves 238 such that when thevalve plate 50 and thehead cover 54 are coupled together, theintake section 254, theexhaust section 258, and themuffler section 262 are aligned with theintake channel 326, theexhaust channel 330, and themuffler channel 334, respectively, to form anintake chamber 342, anexhaust chamber 346, and anintegrated muffler chamber 350, illustrated cross-sectionally inFIG. 8 . A bottom edge of the series ofwalls 310 compresses thecircuitous gasket 252 within thegrooves 238 to seal theintake chamber 342, theexhaust chamber 346, and themuffler chamber 350 to inhibit leaking between thetop surface 234 of thevalve plate 50 and the bottom edge of thewalls 310 of thehead cover 54. Theintake chamber 342 forms a fluid conduit extending between and enclosing theintake opening 272 and thebore inlet apertures 274. Theexhaust chamber 346 forms a fluid conduit extending between and enclosing thebore outlet apertures 282. In the illustrated embodiment, themuffler chamber 350 is positioned between theintake chamber 342 and theexhaust chamber 346 such that theintake chamber 342 and theexhaust chamber 346 surround themuffler chamber 350 around a perimeter of themuffler chamber 350 defined by theinner wall 318. Accordingly, thefirst portion 319 of theinner wall 318 partially defines and is shared between themuffler chamber 350 and theexhaust chamber 346, and thesecond portion 320 of theinner wall 318 partially defines and is shared between themuffler chamber 350 and theintake chamber 342. - Although in the illustrated embodiment the
grooves 238 are defined in thetop surface 234 of thevalve plate 50 and thewalls 310 extend down from thebottom surface 306 of thehead cover 54, in alternative embodiments thewalls 310 may extend up from thevalve plate 50 and thegrooves 238 may be defined by thehead cover 54. In other words, thevalve plate 50 may be a “bath tub” type design, and thehead cover 54 may be a substantially flat cover. In such embodiments, thewalls 310 are integrally formed as a single piece with one of thevalve plate 50 and thehead cover 54. In yet other embodiments, thewalls 310 may be a separate component fixedly coupled to one or both thevalve plate 50 and thehead cover 54. In such embodiments, both thevalve plate 50 and thehead cover 54 may be flat plate type designs or “bath tub” type designs or any combination thereof. In further embodiments, some of thewalls 310 may extend from thehead cover 54 and some of thewalls 310 may extend from thevalve plate 50. In additional embodiments, thewalls 310 are not associated with grooves in the mating surface, but are configured to contact, with or without a gasket, the opposing previously described surfaces of thevalve plate 50 orhead cover 54. Further, although theintake port 270 and theexhaust port 298 are defined by thevalve plate 50, in alternative embodiments, theintake port 270 and theexhaust port 298 may each be defined by thehead cover 54. - In any of these possible combinations both the
valve plate 50 and thehead cover 54 may be formed from die-casting processes that do not require cores to define the chambers entirely within thehead cover 54 or thevalve plate 50 when cast. Accordingly, thehead cover 54 may be made from plastic, in addition to aluminum and other suitable materials. In addition, each of thevalve plate 50 and thehead cover 54 may be integrally formed from a single piece. - With continued reference to
FIGS. 6 and 7 , anexhaust outlet passage 358 is defined in thebottom surface 306 in each of the first andsecond cylinder portions head cover 54. Each of theexhaust outlet passages 358 extends from theexhaust chamber 346 to a corresponding one of theoxygenator manifolds 226, as shown inFIG. 7 . As such, theexhaust outlet passages 358 are in fluid communication with the fluid conduit formed by theexhaust chamber 346. - With reference to
FIG. 8 , asieve bed passage 362 is defined by thehead cover 54 in each of the first andsecond cylinder portions sieve bed passages 362 extends from theoxygenator manifold 226 to asieve bed recess 366 defined by each of the first andsecond cylinder portions sieve bed seat 222. Thesieve bed recess 366 receives an absorbent bed (e.g., a zeolite bed). - With reference to
FIGS. 6 and 9 , amuffler inlet passage 370 is defined in each of the first andsecond cylinder portions head cover 54. Themuffler inlet passage 370 extends from theoxygenator manifold 226 to themuffler chamber 350, as best shown inFIG. 9 . Themuffler chamber 350 forms a fluid conduit between themuffler inlet passages 370 and theexhaust port 298. - Each of the
muffler inlet passages 370 includes a bend 374 (FIG. 9 ). In the illustrated embodiment, thebend 374 in themuffler inlet passages 370 is approximately a right angle, but in some embodiments thebend 374 in themuffler inlet passages 370 may be between approximately 75 degrees and approximately 105 degrees. Themuffler inlet passages 370 are also positioned at opposing ends of themuffler chamber 350, while theexhaust port 298 is positioned centrally on themuffler section 262 of thevalve plate 50 within themuffler chamber 350. Themuffler chamber 350 forms abend portion 376 where air exits each of themuffler inlet passages 370 into the muffler chamber 350 (FIG. 2 ). In the illustrated embodiment, thebend portion 376 is a right angle bend, but in other embodiments may be between approximately 75 degrees and approximately 105 degrees. - The
head cover 350 further comprises amuffler expanding portion 352 in themiddle portion 194 of thehead cover 54 that defines a volume, such that a larger volume is created in the muffler chamber 350 (FIG. 4 ). In some embodiments, a sound dampening medium may also at least partially line or be positioned within themuffler chamber 350. In some embodiments, themuffler chamber 350 may include a plurality of baffles extending from any of the walls defining themuffler chamber 350 of thehead cover 54. In some embodiments, a filter medium may be positioned within themuffler chamber 350. In some embodiments, themuffler chamber 350 may be purposed for heat exchange and insulation, and as such may include insulation medium such as insulating foam. In alternative embodiments, theinner wall 318 of themuffler chamber 350 may extend between theouter wall 314 in the first andsecond cylinder portions walls 322 may each be a double wall in communication with themuffler chamber 350 to lengthen themuffler chamber 350. In further alternative embodiments, themuffler chamber 350 may be entirely defined by either thevalve plate 50 or thehead cover 54 as shown in the embodiment ofFIGS. 15-20 . Themuffler chamber 350 may also be partially formed by either thevalve plate 50 or thehead cover 54 and entirely formed when coupling a separate independent cover thereto instead of when coupling thevalve plate 50 and thehead cover 54 together. In any such embodiment, one or more muffler chambers may be arranged to be directly downstream and/or upstream of the intake port and/or exhaust port, respectively. - Referring back to
FIGS. 4 and 7-9 , the solenoid valve is configured to control flow of the exhaust air from theexhaust chamber 346 to the sieve bed, and expelled or purged nitrogen from the sieve bed to themuffler chamber 350. In particular, when the solenoid valve is in a first position, themuffler inlet passage 370 is blocked in theoxygenator manifold 226, so that only theexhaust outlet passage 358 and thesieve bed passage 362 are in fluid communication. When the solenoid valve is in a second position, theexhaust outlet passage 358 is blocked in theoxygenator manifold 226, so that thesieve bed passage 362 and themuffler inlet passage 370 are in fluid communication through theoxygenator manifold 226. - The
compressor 10 is assembled by positioning themotor 62 and thedrive shaft 66 axially within themotor sleeve 22. Theend housings 26 are coupled to each end of themotor sleeve 22. Theeccentrics 126,pistons 122 andfans 150 are connected to the opposing ends of thedrive shaft 66. Thecylinder sleeve 94 is seated on thesupport floor 90 of each of thecylinder extensions 86. Thevalve plate 50 is then positioned such that thefirst cylinder portion 162 is mounted over thefirst cylinder 30, and thesecond cylinder portion 166 is mounted over thesecond cylinder 34, with themiddle portion 170 extending therebetween. The O-rings 114 are positioned between the top edge of each of thecylinder sleeves 94 and thevalve plate 50. Thecircuitous gasket 252 is fitted into thegrooves 238 within thetop surface 234 of thevalve plate 50. Thehead cover 54 is mounted on thevalve plate 50 so that each of thefirst cylinder portion 186, thesecond cylinder portion 190, and themiddle portion 194 of thehead cover 54 align with thefirst cylinder portion 162 thesecond cylinder portion 166 and themiddle portion 170 of thevalve plate 50. Thewalls 310 defining theintake channel 326, theexhaust channel 330, andmuffler channel 334 of thehead cover 54 are aligned on thecircuitous gasket 252 with thecorresponding intake section 254, theexhaust section 258, andmuffler section 262 of thevalve plate 50 so as to form therespective intake chamber 342, theexhaust chamber 346, and themuffler chamber 350. Thefirst fasteners 210 are then threaded through the alignedbosses head cover 54,valve plate 50, and endhousings 26 to couple thehead cover 54,valve plate 50, and endhousings 26 together. Thesecond fasteners 214 are also threaded through the alignedmiddle bosses valve plate 50 and thehead cover 54. Thewalls 310 of thehead cover 54 compress thecircuitous gasket 252 within thegrooves 238 of thevalve plate 50 as thehead cover 54 is coupled to thevalve plate 50, thereby forming and sealing theintake chamber 342, theexhaust chamber 346, and themuffler chamber 350. - In operation, the
motor 62 rotationally drives thedrive shaft 66, causing thepistons 122 to reciprocate within thebores 98 of each of thecylinders pistons 122, air is drawn into theintake chamber 342 through theintake port 270 from the surrounding environment. The air is then alternatively drawn into thebore 98 of each of the first andsecond cylinders bore inlet aperture 274 depending on the direction of travel of therespective piston 122, offset by virtue of the pair ofeccentrics 126. Theinlet flapper valves 278 permit air to enter thebores 98 through thebore inlet apertures 274, but prevent air from reentering theintake chamber 342. The air is thereafter compressed by the upstroke of thepiston 122 within thebore 98 and forced out thebore outlet aperture 282 through theoutlet flapper valve 286 at an increased pressure. Theoutlet flapper valve 286 prevents the compressed air from reentering thebore 98. The compressed air leaves thebore outlet aperture 282 of each of the first andsecond cylinders exhaust chamber 346. The compressed air recombines (the extent of which depends on the rotational speed of the drive shaft 66) after exiting thebores 98 of each of thecylinders exhaust chamber 346 and flows from theexhaust chamber 346 to theoxygenator manifold 226 of each of thecylinders FIG. 7 ). - When the solenoid valve is in the first position, the pressurized air flows through the
sieve bed passage 362 into the sieve bed of the oxygen concentrator of each of thecylinder portions sieve bed passage 362 to theoxygenator manifold 226. Purged nitrogen then flows from the manifold 226 through themuffler inlet passage 370 of each of the first andsecond cylinder portions muffler chamber 350. Thebend 374 in themuffler inlet passage 370 and thebend portion 376 within themuffler chamber 350 provide for changes in direction and a longer circuitous path for exhaust gas to travel, thereby facilitating sound dampening. The expanded volume of themuffler chamber 350 provides for an expansion space for exhaust gas (e.g., nitrogen) that leaves themuffler inlet passages 370, thereby facilitating sound dampening of the exhaust gas through expansion into themuffler chamber 350. The position of themuffler chamber 350 as integrated into thehead assembly 18 and positioned between theintake chamber 342 and theexhaust chamber 346 provides further sound dampening. The purged nitrogen may also pass through a sound dampening medium, or alternatively around baffles, positioned within or lining themuffler chamber 350 to provide for additional sound reduction and dampening. The baffles provide a more circuitous path for exhaust gas to travel. The purged nitrogen combines within themuffler chamber 350 and is exhausted out of theexhaust port 298 in the center of thevalve plate 50 within themuffler chamber 350. - The purged nitrogen in the
muffler chamber 350 also reduces heat transfer between flow in theintake chamber 342 and flow in theexhaust chamber 346, by providing an insulated layer therebetween. Purged nitrogen in themuffler chamber 350, which is at a lower temperature than compressed air in theexhaust chamber 346, generates an insulative effect between theexhaust chamber 346 and theintake chamber 342 to impede air in theexhaust chamber 346, which is above the temperature of air in theintake chamber 342, from raising the temperature of air in theintake chamber 342. Specifically, as shown inFIG. 6 , thefirst portion 319 of theinner wall 318 partially defines theexhaust chamber 346 and thesecond portion 320 of theinner wall 318 partially defines theintake chamber 342, thereby separating theexhaust chamber 346 and theintake chamber 342 by a width of themuffler chamber 350. This configuration further permits themuffler chamber 350 to act as a heat exchanger, providing insulation between air in theexhaust chamber 346 and theintake chamber 342. In particular, it is desirable to impede hot pressurized exhaust air from raising the temperature of intake air, which is typically at ambient temperature, to improve efficiency. The gas passing through themuffler chamber 350 is cooled and absorbs heat from the exhaust air in theexhaust chamber 346, thereby inhibiting the exhaust air from raising the temperature of the intake air. As previously mentioned, themuffler chamber 350 may include insulation material specifically for reducing heat transfer between theintake chamber 342 and theexhaust chamber 346. - Although in the illustrated embodiment the
compressor 10 includes pressure swing absorption oxygen concentrators configured for oxygen concentration, in alternative embodiments, thecompressor 10 and thehead assembly 18 may be configured simply for gas (e.g., air) compression. In such an embodiment, thehead cover 54 does not include the solenoid valves or thesieve bed seats 222 for mounting the oxygen concentrators. Accordingly, each of the first andsecond cylinder portions head cover 54 defines a passage that fluidly communicates theexhaust chamber 346 and themuffler chamber 350. As such, in operation, compressed air flows through the passages from theexhaust chamber 346 to themuffler chamber 350. The compressed air then exits themuffler chamber 350 through theexhaust port 298. Alternatively, theinner wall 318 may include an opening or plurality of openings that communicate theexhaust chamber 346 directly with themuffler chamber 350, in lieu of themuffler inlet passage 370 and theexhaust outlet passages 358. A series of baffles may be disposed within either or both of theexhaust chamber 346 and themuffler chamber 350 so as to provide a tortuous or circuitous path for the compressed air to flow before exiting through theexhaust port 298. Theexhaust chamber 346 andmuffler chamber 350 may optionally include insulative, sound-dampening, or filter materials. - Although in the illustrated embodiment the
head assembly 18 is configured for single stage parallel flow, in alternative embodiments, thegrooves 238 and thecorresponding walls 310 may be configured for any type of flow configuration (e.g., a multi-stage series flow embodiment or a single exhaust chamber embodiment, as illustrated inFIGS. 10-14 andFIGS. 21-25 respectively, and as described below). - In an alternative embodiment, the
head assembly 18 may be reconfigured such that theexhaust port 298 is an intake port that leads directly into a muffler chamber like themuffler chamber 350, such that flow through thecompressor 10 is essentially reversed. In such an embodiment, air is drawn through the intake port (i.e., exhaust port 298) into themuffler chamber 350. The air travels through themuffler chamber 350 to provide sound dampening using the various methods described above. Themuffler chamber 350 is in direct communication with theexhaust chamber 346, whereby theflapper valves 286 are reconfigured to allow air to enter thebores 98 from theexhaust chamber 346 via theapertures 282. In addition, theflapper valves 278 are reconfigured to allow compressed air to enter theintake chamber 342 through theapertures 274. The compressed air may flow through theintake opening 272 out theintake port 270. -
FIGS. 10-14 illustrate ahead assembly 18 a in accordance with a multi-stage, series flow embodiment that may be used in place of thehead assembly 18 on thecompressor 10 ofFIGS. 1-9 . Thus, thehousing assembly 14 will not be described again in detail, and only differences in the structure and manner of operation of thecompressor 10 when using thehead assembly 18 a ofFIGS. 10-14 will be described below. Like components and features to thehead assembly 18 ofFIGS. 1-9 are identified with like reference numerals plus the letter “a” and will not be described again in detail. - With reference to
FIG. 10 , only thesecond cylinder portion 190 a of the head cover 54 a includes the sieve bed seat 222 a and theoxygenator manifold 226 a, while thefirst cylinder portion 186 a of the head cover 54 a simply includes acylinder cover 382. - With reference to
FIGS. 10-11 , the grooves 238 a in thetop surface 234 a of thevalve plate 50 a comprise anouter groove 242 a extending around the perimeter of thevalve plate 50 a, aninner groove 246 a within a perimeter of theouter groove 242 a, and first connectinggrooves 250 a connecting theinner grooves 246 a and theouter grooves 242 a within the first andsecond cylinder portions groove 390 extending between theouter groove 242 a and theinner groove 246 a along a vertical centerline C of themiddle portion 170 a of thevalve plate 50 a. The grooves 238 a define a firststage intake section 394, a firststage exhaust section 398, a secondstage intake section 402, a secondstage exhaust section 406, and themuffler section 262 a. The firststage intake section 394 is defined within thefirst cylinder portion 162 a by theouter groove 242 a, theinner groove 246 a, one of the first connectinggrooves 250 a and the second connectinggroove 390. The firststage exhaust section 398 and the secondstage intake section 402 are continuous with one another and are defined within the first andsecond cylinder portions middle portion 170 a by theouter groove 242 a, theinner groove 246 a, and the first connectinggrooves 250 a so as to form an intermediate section. The secondstage exhaust section 406 is defined within thesecond cylinder portion 162 a by theouter groove 242 a, theinner groove 246 a, one of the first connectinggrooves 250 a, and the second connectinggroove 390. In alternative embodiments, a single groove may bisect theouter groove 242 a along the horizontal centerline A so as to only define the firststage intake section 394, the firststage exhaust section 398, the secondstage intake section 402, and the secondstage exhaust section 406, in lieu of a muffler section 262 (i.e., similar to center groove 478 ofFIGS. 15-20 ). - The
intake port 270 a communicates with anintake opening 272 a defined in the firststage intake section 394 of thevalve plate 50 a. A firstbore inlet aperture 414 and a firstbore outlet aperture 418 are defined in thefirst cylinder portion 162 a so as to extend through thevalve plate 50 a for fluid communication with the bore 98 a of the first cylinder 30 a, each having a corresponding flapper valve (not shown). The firstbore inlet aperture 414 is located in the firststage intake section 394 and the firstbore outlet aperture 418 is located in the firststage exhaust section 398. A secondbore inlet aperture 422 and a secondbore outlet aperture 426 are defined in thesecond cylinder portion 166 a so as to extend through thevalve plate 50 a for fluid communication with the bore 98 a of the second cylinder 34 a, each having a corresponding flapper valve (not shown). The secondbore inlet aperture 422 is located in the secondstage intake section 402 and the secondbore outlet aperture 426 is located in the secondstage exhaust section 406. The safetyvalve support recess 290 a is defined in the intermediate section and receives a safety valve (likesafety valve 294 shown inFIG. 3 ). Although not illustrated, the secondstage exhaust section 406 may also include a recess for supporting an additional safety valve. - With reference to
FIG. 12 , the walls 310 a of the head cover 54 a includes anouter wall 314 a extending around the perimeter of the head cover 54 a, aninner wall 318 a within a perimeter of theouter wall 314 a, and first connectingwalls 322 a connecting theinner wall 318 a and theouter wall 314 a within the first andsecond cylinder portions wall 434 that extends between theinner wall 318 a and theouter wall 314 a along a vertical centerline D withinmiddle portion 194 a. The series of walls 310 a and thebottom surface 306 a form a firststage intake channel 438, a firststage exhaust channel 442, a secondstage intake channel 446, a secondstage exhaust channel 450, and amuffler channel 334 a. Similar to thevalve plate 50 a, the firststage intake channel 438 is defined by theouter wall 314 a, theinner wall 318 a, one of the first connectingwalls 322 a, and the second connectingwall 434 within thefirst cylinder portion 186 a. The firststage exhaust channel 442 and the secondstage intake channel 446 are continuous with one another and are defined within the first andsecond cylinder portions middle portion 194 a by theouter wall 314 a, theinner wall 318 a, and the first connectinggrooves 250 a so as to form an intermediate channel. The second stage exhaust channel 450 a is formed within thesecond cylinder portion 250 a by theouter wall 314 a, theinner wall 318 a, one of the first connectingwalls 322 a, and the second connectingwall 434. - The series of walls 310 a correspond to the grooves 238 a, such that when the
valve plate 50 a and the head cover 54 a are coupled together the firststage intake section 394, the firststage exhaust section 398, the secondstage intake section 402, the secondstage exhaust section 406, and themuffler section 262 align with the firststage intake channel 438, the firststage exhaust channel 442, the secondstage intake channel 446, the secondstage exhaust channel 450, and themuffler channel 334, respectively, so as to form a firststage intake chamber 458, a firststage exhaust chamber 462, a secondstage intake chamber 466, a secondstage exhaust chamber 470, and themuffler chamber 350 a, respectively, as shown inFIGS. 13-14 . The firststage intake chamber 458 extends between and encloses theintake opening 272 a and the firstbore inlet aperture 414. The secondstage exhaust chamber 470 encloses the secondbore outlet aperture 426. The firststage exhaust chamber 462 and the secondstage intake chamber 466 are continuous so as to form an intermediate chamber that extends between and encloses the firstbore outlet aperture 418 and the secondbore inlet aperture 422. In alternative embodiments, the connectingwalls 322 a may extend along the horizontal centerline B and meet to form a single wall that extends longitudinally across the head cover 54 a, in lieu of amuffler chamber 350 a (i.e., similar tocenter wall 482 ofFIGS. 15-20 ). - With continued reference to
FIG. 12 , themuffler chamber 350 a is positioned generally between the intermediate chamber, the firststage intake chamber 458, and the secondstage exhaust chamber 470 such that the intermediate chamber, the firststage intake chamber 458, and the secondstage exhaust chamber 470 surround themuffler chamber 350 a around a perimeter of themuffler chamber 350 a defined by theinner wall 318 a. Accordingly, thefirst portion 319 a of theinner wall 318 a partially defines the firststage intake chamber 458 and partially defines the secondstage exhaust chamber 470, and thesecond portion 320 a of theinner wall 318 a partially defines the intermediate chamber, thereby separating theexhaust chamber 346 and theintake chamber 342 by a width of themuffler chamber 350 a. In this configuration, themuffler chamber 350 a provides insulation between the firststage intake chamber 458, the intermediate chamber, and the secondstage exhaust chamber 470. - With continued reference to
FIG. 12 , thebottom surface 306 a of the head cover 54 a defines a singleexhaust outlet passage 358 a in thesecond cylinder portion 190 a that extends from the secondstage exhaust chamber 470 to theoxygenator manifold 226 a. Thebottom surface 306 a also defines a singlemuffler inlet passage 370 a extending from theoxygenator manifold 226 a of thesecond cylinder portion 190 a to themuffler chamber 350 a. - In operation, air is drawn into the first
stage intake chamber 470 through theintake port 270 a from the surrounding environment during a downstroke of the piston 122 a of the first cylinder 30 a. The air is then drawn into the bore 98 a of the first cylinder 30 a through the firstbore inlet aperture 414. The flapper valve corresponding to the firstbore inlet aperture 414 allows air to enter the bore of the first cylinder 30 a, but prevents air from reentering the firststage intake chamber 470. The air is then compressed to a first pressure by the piston 122 a of the first cylinder 30 a, forced out the firstbore outlet aperture 418 into the intermediate chamber (i.e., firststage exhaust chamber 462 and the second stage intake chamber 466). The flapper valve corresponding to the firstbore outlet aperture 418 allows air to exit the bore 98 a of the first cylinder 30 a into the intermediate chamber, but prevents air from reentering the bore 98 a of the first cylinder 30 a. The compressed air enters the bore 98 a of the second cylinder 34 a through the secondbore inlet aperture 422. The flapper valve corresponding to the secondbore inlet aperture 422 allows air to enter the bore 98 a of the second cylinder 34 a, but prevents air from reentering the intermediate chamber. The air is then compressed to a second pressure higher than the first pressure by the piston 122 a of the second cylinder 34 a and forced out the secondbore outlet aperture 426 into the secondstage exhaust chamber 470. The flapper valve corresponding to the secondbore outlet aperture 426 allows air to leave the bore 98 a of the second cylinder 34 a into the secondstage exhaust chamber 470, but prevents air from reentering the bore 98 a of the second cylinder 34 a. The air flows through the exhaustchamber outlet passage 358 a to theoxygenator manifold 226 a of thesecond cylinder portion 190 a of the head cover 54 a. When the solenoid valve is in the first position the compressed air flows through thesieve bed passage 362 a to thesieve bed recess 366, where pressure swing absorption separates nitrogen and oxygen. When the solenoid valve is in the second position the purged nitrogen flows through themuffler inlet passage 370 a into themuffler chamber 350 a, optionally through sound dampening medium or another medium previously described, and out theexhaust port 298 a in the center of themuffler section 262 a of thevalve plate 50 a. -
FIGS. 15-20 illustrate ahead assembly 18 b in accordance with a multi-stage, series flow embodiment that may be used in place of thehead assembly 18 on thecompressor 10 ofFIGS. 1-9 . Thus, thehousing assembly 14 will not be described again in detail, and only differences in the structure and manner of operation of thecompressor 10 when using thehead assembly 18 b ofFIGS. 15-20 will be described below. Like components and features to thehead assembly 18 ofFIGS. 1-9 are identified with like reference numerals plus the letter “b” and will not be described again in detail. - With reference to
FIGS. 15-16 , thegrooves 238 b in thetop surface 234 b of thevalve plate 50 b comprise anouter groove 242 b extending around the perimeter of thevalve plate 50 b, and asingle center groove 478 extending along a horizontal centerline A of thevalve plate 50 b bisecting thefirst cylinder portion 162 b, themiddle portion 170 b, and thesecond cylinder portion 166 b of thetop surface 234 b to define anintake section 254 b and anexhaust section 258 b. Accordingly, theintake section 254 b and theexhaust section 258 b are on opposite sides of thecenter groove 478. - The
valve plate 50 b includes abore inlet aperture 274 b defined in and extending through each of the first andsecond cylinder portions cylinders intake section 254 b. Each of thebore inlet apertures 274 b has a corresponding bore inlet flapper valve (not shown) to allow intake air to enter the cylinders 98 b from theintake section 254 b, but not vice versa. Thevalve plate 50 b further includes abore outlet aperture 282 b defined in and extending through each of the first andsecond cylinder portions exhaust section 258 b. Each of thebore outlet apertures 282 b has a corresponding bore outlet flapper valve (not shown) to allow exhaust air to exit the cylinder bores 98 b, but not vice versa. - With reference to
FIGS. 17-20 , thewalls 310 b of thehead cover 54 b correspond to thegrooves 238 b of thevalve plate 50 b and include anouter wall 314 b extending around the perimeter of thehead cover 54 b, and acenter wall 482 within the perimeter of theouter wall 314 b extending along the horizontal centerline B of thehead cover 54 b bisecting thefirst cylinder portion 186 b, themiddle portion 194 b, and thesecond cylinder portion 194 b to form anintake channel 326 b, and anexhaust channel 330 b. Accordingly, theintake channel 326 b and theexhaust channel 330 b are on opposite sides of thecenter wall 482. - The series of
walls 310 b correspond to the grooves 328 b, such that when thevalve plates 50 b and thehead cover 54 b are coupled together theintake section 254 b and theexhaust section 258 b align with theintake channel 326 b and theexhaust channel 330 b, so as to form an intake chamber 342 b and anexhaust chamber 346 b, respectively, as shown inFIGS. 19-20 . The intake chamber 342 b extends between and encloses thebore inlet apertures 274 b. Theexhaust chamber 346 b extends between and encloses thebore outlet apertures 282 b. - With continued reference to
FIGS. 17-20 , thehead cover 54 b defines anintake passage 486 and anexhaust passage 490. Theintake passage 486 extends from anintake passage inlet 494 to anintake passage outlet 498 defined in theinner bottom surface 306 b within theintake channel 326 b to communicate the environment with the intake chamber 342 b (FIGS. 18 and 20 ). Theexhaust passage 490 extends from anexhaust passage inlet 502 to anexhaust passage outlet 506 to communicate theexhaust chamber 346 b with the environment (FIGS. 18-19 ). Theexhaust passage 490 or theintake passage 486 may be connected to a system or reservoir. Theexhaust passage 490 and theintake passage 486 each define a volume that provides sound dampening of gas passing through thepassages exhaust passage 490 and theintake passage 486. In some embodiments, one or both of thepassages passages head cover 54. Accordingly, one or both of theexhaust passage 490 and theintake passage 486 may further be used as a muffler chamber that is integrally formed with thehead cover 54 b. In some embodiments, a filter medium may be positioned within one or both of thepassages - In operation, air is drawn into the
intake passage 486 through theintake passage inlet 494 from the surrounding environment and then enters into the intake chamber 342 b through theintake passage outlet 498 during a downstroke of the piston 122 b of the first and second cylinders 30 b, 34 b. Optionally, the air passes through sound dampening medium or another medium previously described, within theintake passage 486. The air is then alternatively drawn into bore 98 b of each of the first and second cylinders 30 b, 34 b through the correspondingbore inlet aperture 274 b depending on the direction of travel of the respective piston 122 b. The inlet flapper valves permit air to enter the bores 98 b from the intake chamber 342 b, but prevent air from entering the intake chamber 342 b from the bores 98 b. The air is thereafter compressed by the upstroke of the piston 122 b within the bore 98 b and forced out the respectivebore outlet aperture 282 b through the outlet flapper valve at an increased pressure. The outlet flapper valve prevents the compressed air from reentering the bore 98 b. The compressed air leaves thebore outlet aperture 282 b of each of the first and second cylinders 30 b, 34 b and enters theexhaust chamber 346 b. The compressed air recombines (the extent of which depends on the rotational speed of the drive shaft 66 b) after exiting the bores 98 b of each of the cylinders 30 b, 34 b within theexhaust chamber 346 b and flows from theexhaust chamber 346 into theexhaust passage 490 via theexhaust passage inlet 502. The compressed air passes through theexhaust passage 490 before exiting via theexhaust passage outlet 506. Optionally, the air passes through sound dampening medium or another medium previously described, within theexhaust passage 490. -
FIGS. 21-25 illustrate ahead assembly 18 c for acompressor 10 c in accordance with a single exhaust chamber embodiment. Like components and features are identified with like reference numerals plus the letter “c” and will not be described again in detail. In particular, thehousing assembly 14 is substantially identical to the housing assembly ofFIGS. 1-9 , with exception of a few features described in detail below. - With reference to
FIGS. 21-22 , theend housings 26 c each define anintake port 510. Thehousing assembly 14 c further includes anend cap 514 that is coupled to each of theend housings 26 c to form anintake chamber 518 within each of theend housings 26 c. Each of thepistons 122 c defines abore inlet aperture 522 with a corresponding flapper valve (not shown) that allows air to enter thebore 98 c during the downstroke, but not the upstroke of thepiston 122 c. - With reference to
FIGS. 23-25 , thevalve plate 50 c includes agroove 238 c that extends around an outer perimeter of the first andsecond cylinder portions middle portion 170 c. Thevalve plate 50 c has atop surface 234 c, and includes projections and corresponding recesses that extend downward into thevalve plate 50 c and thebores 98 c. Thegroove 238 c defines anexhaust section 530 that is continuous between the first andsecond cylinder portions middle portion 170 c of thevalve plate 50 c. Abore outlet aperture 534 is defined in each of the first andsecond cylinder portions valve plate 50 c for fluid communication with each of the bores, each of thebore outlet apertures 534 having a corresponding bore outlet flapper valve 542 (FIG. 23 ). Anexhaust opening 538 in fluid communication with theexhaust port 298 c extends from theexhaust section 530 in themiddle portion 170 c of thevalve plate 50 c to atmosphere. - The head cover 54 c includes an
outer wall 314 c extending around a perimeter of the first andsecond cylinder portions middle portion 194 c of thehead cover 54 c to define anexhaust channel 550. Theouter wall 314 c of thehead cover 54 c corresponds to thegroove 238 c of thevalve plate 50 c, such that when thevalve plate 50 c and thehead cover 54 c are coupled together, theexhaust section 530 and theexhaust channel 550 form anexhaust chamber 554. Theexhaust chamber 554 extends between and encloses anexhaust opening 538 of theexhaust port 298 c and thebore outlet apertures 534. A gasket (not shown) may be received in thegroove 238 c and compressed by theouter wall 314 c to seal theexhaust chamber 554. - In operation, air is drawn into each of the
intake chambers 518 through theintake ports 510 of theend housings 26 c from the surrounding environment during the downstroke of each of thepistons 122 c. The air is then drawn into thebore 98 c of each of thecylinders bore inlet aperture 522 into thepiston 122 c. The inlet flapper valves allow air into thebore 98 c, but prevent air from reentering theintake chamber 510. The air is compressed during the upstroke of thepiston 122 c within thebore 98 c. Compressed air is forced through thebore outlet aperture 534 into theexhaust chamber 554. Theoutlet flapper valve 542 allows air into theexhaust chamber 554, but prevents air from reentering thebore 98 c. Compressed air from both the first andsecond cylinders exhaust chamber 554, which fluidly connects the first andsecond cylinders second cylinders exhaust chamber 554 through theexhaust port 298 c. - Although not shown baffles may be positioned within
exhaust chamber 554 so as to provide a circuitous path for compressed air passes to flow from thebore outlet apertures 534 to theexhaust port 298 c to provide sound dampening. Baffles may extend down from thehead cover 54 c or up from thevalve plate 50 c between themiddle portion 194 c and thefirst cylinder portion 186 c, and themiddle portion 194 c and thesecond cylinder portion 190 c. Alternatively, theexhaust chamber 554 may contain or be lined with a sound dampening medium to provide sound dampening to compressed gas passing through theexhaust chamber 554 fromoutlet apertures 534 to theexhaust port 298 c. - In further alternative embodiments the valve plate and the head cover of the head assembly may have any arrangement to facilitate various flow configurations. In one further embodiment the head assembly may be configured to have a pressure driven pump in the first cylinder and a vacuum driven pump in the second cylinder. That is, the first cylinder portion of the valve plate and head cover has corresponding walls and grooves that come together to form an intake chamber and an exhaust chamber, and the second cylinder portion of the valve plate and the head cover has corresponding walls and grooves that come together to form an intake chamber and an exhaust chamber. In such a configuration, the intake and exhaust chambers of each of the first and second cylinder portions are independent from one another, so that one is a pressure driven pump and one is a vacuum driven pump. Alternatively, the first cylinder portion may form an exhaust chamber only, in which the intake is beneath the piston, and/or the second cylinder portion may form an intake chamber only, in which the exhaust is beneath the piston.
- In another embodiment, the head assembly may be configured as a multi-stage compressor, in which intake in the first cylinder is beneath the piston. That is, the valve plate and the head cover have corresponding walls and grooves that cooperate to form a first stage exhaust chamber in the first cylinder portion and a second stage intake chamber in the second cylinder portion that are continuous with one another. The corresponding walls and grooves also form a second stage exhaust chamber in the second cylinder portion.
- In yet another embodiment, the head assembly may be configured as a pressure/vacuum multi-stage compressor with an intake in the first cylinder beneath the piston. That is, the valve plate and the head cover define corresponding walls and grooves that cooperate to form a first stage exhaust chamber in the first cylinder portion and a second stage intake chamber in the second cylinder portion that are continuous with one another.
- In still yet another embodiment, a compressor having a single cylinder housing with a single bore and corresponding piston is provided. The compressor further includes a head assembly having a valve plate and a head cover. The valve plate has an intake section, an exhaust section, and a muffler section positioned between the intake section and the exhaust section defined by a series of grooves. The intake section has a bore inlet aperture extending through the valve plate and the exhaust section has a bore outlet aperture extending through the valve plate. Each of the bore inlet aperture and the bore outlet aperture has a corresponding flapper valve. The head cover has walls extending from a head cover face that form an intake channel, an exhaust channel, and a muffler channel corresponding to the intake section, exhaust section, and muffler section, such that the head cover can cooperate with the valve plate to form an intake chamber, an exhaust chamber and a muffler chamber. The muffler chamber in this configuration is surrounded around its perimeter by the exhaust chamber and the intake chamber. The muffler chamber may contain or be lined with insulation medium or sound dampening medium. The head cover defines an intake port that extends into the intake chamber, and an exhaust port that extends out the muffler chamber. The head cover further defines a passage extending from the exhaust chamber to the muffler chamber. In operation, air is drawn through the intake port into the intake chamber before entering the bore through the bore inlet aperture. The air is compressed before being forced out the bore outlet aperture into the exhaust chamber. The air then flows through the passage into the muffler chamber provided before exiting through the exhaust port. The head cover may include an oxygen concentrator such that purged nitrogen travels through the muffler chamber.
- Although the head assemblies of the illustrated embodiments are two-cylinder compressors, in alternate embodiments the head assemblies may include any number of cylinder portions for corresponding compressors having any number of cylinders. In addition, one of ordinary skill in the art would recognize that the disclosure also equally applies to pumps, and other similar devices that include head assemblies.
- While the above describes example embodiments of the present disclosure, these descriptions should not be viewed in a limiting sense. Rather, several variations and modifications can be made without departing from the scope of the present disclosure.
- Various features and advantages are set forth in the following claims.
Claims (21)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US15/481,241 US20180291885A1 (en) | 2017-04-06 | 2017-04-06 | Valve plate and head cover assembly |
PCT/US2018/026302 WO2018187601A1 (en) | 2017-04-06 | 2018-04-05 | Valve plate and head cover assembly |
CN201880035436.0A CN110678652A (en) | 2017-04-06 | 2018-04-05 | Valve plate and head assembly |
JP2019554694A JP2020513085A (en) | 2017-04-06 | 2018-04-05 | Valve plate and head cover assembly |
EP18781810.9A EP3607202A4 (en) | 2017-04-06 | 2018-04-05 | Valve plate and head cover assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US15/481,241 US20180291885A1 (en) | 2017-04-06 | 2017-04-06 | Valve plate and head cover assembly |
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US20180291885A1 true US20180291885A1 (en) | 2018-10-11 |
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US15/481,241 Abandoned US20180291885A1 (en) | 2017-04-06 | 2017-04-06 | Valve plate and head cover assembly |
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US (1) | US20180291885A1 (en) |
EP (1) | EP3607202A4 (en) |
JP (1) | JP2020513085A (en) |
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US10578086B2 (en) * | 2014-11-10 | 2020-03-03 | Koninklijke Philips N.V. | Connector for a compressor assembly |
US20200309303A1 (en) * | 2019-04-01 | 2020-10-01 | Inogen, Inc. | Compact portable oxygen concentrator |
IT201900012123A1 (en) * | 2019-07-17 | 2021-01-17 | Officine Mario Dorin S P A | MULTI-CYLINDRICAL REFRIGERATOR COMPRESSOR WITH EXTERNAL DELIVERY MANIFOLD |
US20210404457A1 (en) * | 2020-06-24 | 2021-12-30 | Bitzer Kuehlmaschinenbau Gmbh | Refrigerant compresssor |
EP3963207A4 (en) * | 2019-04-29 | 2023-04-19 | Gast Manufacturing, Inc. | Sound reduction device for rocking piston pumps and compressors |
CN117307440A (en) * | 2023-11-29 | 2023-12-29 | 沈阳海龟医疗科技有限公司 | Frequency conversion level middle oil-free vacuum compressor |
WO2024073538A1 (en) * | 2022-09-30 | 2024-04-04 | Gast Manufacturing, Inc. | Sound reduction device for rocking piston compressors |
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- 2018-04-05 EP EP18781810.9A patent/EP3607202A4/en not_active Withdrawn
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- 2018-04-05 CN CN201880035436.0A patent/CN110678652A/en active Pending
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US10578086B2 (en) * | 2014-11-10 | 2020-03-03 | Koninklijke Philips N.V. | Connector for a compressor assembly |
US20200309303A1 (en) * | 2019-04-01 | 2020-10-01 | Inogen, Inc. | Compact portable oxygen concentrator |
US11686415B2 (en) | 2019-04-01 | 2023-06-27 | Inogen, Inc. | Compact portable oxygen concentrator |
US11821559B2 (en) * | 2019-04-01 | 2023-11-21 | Inogen, Inc. | Compact portable oxygen concentrator |
EP3963207A4 (en) * | 2019-04-29 | 2023-04-19 | Gast Manufacturing, Inc. | Sound reduction device for rocking piston pumps and compressors |
IT201900012123A1 (en) * | 2019-07-17 | 2021-01-17 | Officine Mario Dorin S P A | MULTI-CYLINDRICAL REFRIGERATOR COMPRESSOR WITH EXTERNAL DELIVERY MANIFOLD |
US20210404457A1 (en) * | 2020-06-24 | 2021-12-30 | Bitzer Kuehlmaschinenbau Gmbh | Refrigerant compresssor |
WO2024073538A1 (en) * | 2022-09-30 | 2024-04-04 | Gast Manufacturing, Inc. | Sound reduction device for rocking piston compressors |
CN117307440A (en) * | 2023-11-29 | 2023-12-29 | 沈阳海龟医疗科技有限公司 | Frequency conversion level middle oil-free vacuum compressor |
Also Published As
Publication number | Publication date |
---|---|
WO2018187601A1 (en) | 2018-10-11 |
EP3607202A1 (en) | 2020-02-12 |
CN110678652A (en) | 2020-01-10 |
EP3607202A4 (en) | 2020-02-12 |
JP2020513085A (en) | 2020-04-30 |
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