CA1214758A - Discharge valve assembly - Google Patents
Discharge valve assemblyInfo
- Publication number
- CA1214758A CA1214758A CA000395485A CA395485A CA1214758A CA 1214758 A CA1214758 A CA 1214758A CA 000395485 A CA000395485 A CA 000395485A CA 395485 A CA395485 A CA 395485A CA 1214758 A CA1214758 A CA 1214758A
- Authority
- CA
- Canada
- Prior art keywords
- valve
- leaf spring
- valve member
- opening
- closed position
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0413—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded in the form of closure plates
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compressor (AREA)
- Check Valves (AREA)
Abstract
DISCHARGE VALVE ASSEMBLY
Abstract of the Disclosure An improved discharge valve assembly for use with compressors and particularly the type utilizing a disc-like pressure responsive discharge valve is disclosed which includes a bridge element secured to a plate overlying the valve plate and one or more leaf spring biasing elements of the curved disc type positioned between the bridge element and disc valve member and being operative to urge the valve into a closed position. The bridge element is also provided with guide fingers to retain both the leaf spring elements and valve member in operative position.
Abstract of the Disclosure An improved discharge valve assembly for use with compressors and particularly the type utilizing a disc-like pressure responsive discharge valve is disclosed which includes a bridge element secured to a plate overlying the valve plate and one or more leaf spring biasing elements of the curved disc type positioned between the bridge element and disc valve member and being operative to urge the valve into a closed position. The bridge element is also provided with guide fingers to retain both the leaf spring elements and valve member in operative position.
Description
The present invention relates generally to pressure responsive compressor valve assemblies and more particularly to such assemblies employing disc type valve members and c particularly adapted for use on reErigeration compressors.
The present invention is particularly well suited for use in combiantion with the disc like lightweight valves of the type disclosed in assignee's copending Canadian appli-; cation Serial No. 341,333, filed December 6, 1979 and the head and valve plate of assignee's U.S. Patent No. 4,385,872 ! 10 and represents an alternative to the coil spring biasing arrangements of assignee's U.S. Patent No. 4,329,125. It may be used in both rotary and other types of compressors including single and multi-c~vlinder reciprocating piston type compressors of either hermetic or accessible hermetic type.
Valve plates and cylinder head assemblies can become relatively complex in configuration for certain valve arrangements and as a result may be quite costly to manu~acture and sometimes to assemble.
The present invention resides in a valve having means defining a fluid passage for increasing cross-sectional - area in the direction of fluid flow, the sidewalls of the passage defining a valve seat and there being a v~lve member having a peripheral edge adapted to sealingly engage the valve seat when the valve is closed.
According to the present invention, there is provided a valve assembly for use in compressors and including a valve plate adapted for controlling fluid from a compression chamber of the compressor and having a discharge opening therethrough. The opening may be circular and provided with milh /\ ~
` -sidewalls defining a valve seat with an increasing diameter in a direction away from the compressor chamber. The valve member is engageable with the valve seat to close the discharge opening, a specific form of this member being disc-shaped and formed of a compliant material such as polymeric material.
A leaf spring, which may be a bowed leaf spring formed of metal, is positioned in alignment with the valve member with the convex center portion thereof acting against the valve member and biasing into a closed position. A bridge member overlies the discharge opening and is fixed in position with respect to the valve plate, the bridge member having means defining guide surfaces extending into the opening and surrounding the peripheral edge of the valve member and the leaf spring so as to maintain the leaf spring and the valve member generally in alignment with one another and the discharge opening.
The guide surface is normally radially spaced from the peripheral edge of the leaf spring when the valve member is in a closed position, and the means defining the guide surfaces being spaced from the sidewalls of the opening so as to define a discharge passage therebetween.
In one embodiment of the invention, the bridge member, which is mounted in a fixed position with respect to the valve plate, includes a stop surface formed of a relatively hard material engaging the outer periphery of the bowed leaf spring to urge the valve member into the closed position, the guide member having guide surfaces normally radially spaced from the peripheral edge of the leaf spring a sufficient distance so as to accommodate radial movement of the leaf spring and the means defining the guide surfaces being spaced ~ ~ - 2 -- ~Z1475B
from the sidewalls of the opening whereby a discharge gas flow path is provided therebetween.
Additional advantages and features of the present invention will become apparent from the subsequent description and the appended claims taken in conjunction with the accompanying drawings.
Brief Description of the Drawinqs Figure 1 is a fragmentary section view of a portion of a refrigeration compressor showing a valve plate assembly in accordance with the present invention;
Figure 2 is a fragmentary plan view of the valve plate assembly of Figure l;
Figures 3 and 4 are section views of the valve plate assembly of Figure 1, the sections being taken along lines 3-3 and 4-4 respectively thereof;
Figure 5 is a perspective view of a leaf spring member designed for use in the valve plate assembly of the present invention;
Figure 6 is a graph plotting the relationship between biasing force and lift for both the leaf spring forming a part of the present invention and a conventional coil spring;
and 2a -, ! ) 75~3 Figu~e 7 is a p~rspective view of the discharge valve shown in Figure 1.
Description of the Preferred ~mbodiment ~ eferring ncw to the drawings and in particular tD Figure 1 thereof, there is shcwn a valve plate as~embly 10 in accordance wi~h the present invention and cc~prising a valve plate 12 having a ring valve seat n~mber 14 positioned within a generally conically shaped opening provided therein so as to define ~ubstantially concentric suction and discharge gas pRssages 16 and 18 respectively therethrough.
lQ A second plate nEmber 30 is positicned on the upper surface o~ valve plate 1~ ~ith a suitable seal mg gasket 22 dispDsed therebetween ~o as 1~D isolate suctian and discharge gas passages 16 and 18. An cq?en-ing 24 iq provided extending thrcugh plate 20 which is adapted to allow discharge gas to pass upwardly tas shown) therethrough. The Yalve plate assembly as described thus far is substantially identical tD the vzlve pla~e assembly described in detail in as~ignee's-U.S. Patent No. dl,385,872.
A lightweight compliant polymeric discharge valve member 26is also provided seated against conical surfac~ 28 which defines a valve seat wit n discharge passage 18. Discharge valve 26 is pre-ferably of the gener~l type described in detail in assignee's Canadian Patent 1,179,575, issued December 18, 1984.
A bridge nEmber 30 is prcvided having a generally ~ylindri-cally ~haped central portion 32 positioned approximately coaxially with cFening 24 and a pQir of dia~.etrically outwardly eKtending arms 34 ana 36 are secured to the upper surface 38 of plate ~e~ber 20 by means of bolts 40 and 42 extending through openings provided in axms 34 and 36 and into thread~d engayement with suitably position~1 ......
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.
.
openings provided in plate member 20. Central portion 32 of bridge m~ber is of a diameter substantially less than the diameter of op~ning 24 provided in plate n~mber 20 so as to leave a su`bstantially unrestricted area for passage of discharge gas and also includes a plurality o~
substantially identical circ~nferentially spaced depending guide fingers 44 projecting through op~mng 24 and into discharge passage lB
in valve plate 12. m e lcwer surface 46 of each of guide fingers 44 is beveled or inclined so as to enaole it to be positioned in very close, slightly spaced relationship to valve seat surEace 28 of ring me~ker 14. The inwardly facing surface 48 of each of guide ~ingers 44 has a conrave shape defining segments of a cylinder having a diam.eter slightly greater than that of valve ne~ber 26 so as to provide a clearance there~etween. .
A wear plate nemker 50 is also provided positioned in ~ngaging relationship with under surface 52 of bridge me~ber 30. Wear plate nY~er 50 has a generally circular shap with a diameter approx~mately equal to the diameter of the central portion of bridga mem~er and ~-includes a plurality of flat edge surfaces 54 positioned adjacent each of the guide fingers 44 and ccoperating therewith so as to prevent relative rotation of the wear plate.
In order to bias valve member into ~ closed position as ~h~n a pair of substantially identical leaf springs 56 of the cNrved disc -type ~-e provided being positioned between upper surEace 58 of valve nemker 26 and lower s~rface 59 of wear plate 50. As best seen with reference to Fig~re 5, leaf springs 56 are each in the for~ of rela-tively thin metal discs having diametrically opposite edges 60 and 62 b~wed upwardly as shcwn therein so as to define a generally arcuate ~.
shape in transverse cross section. As clearly sha~n in Figure 4, leaf springs 56 do not have any opEnings providea therein and are -- 4 -- .
.
~, ~ 7~
positioned with ~oncave 6urfa oe 64 ~acing lower surface 59 of waar plate 50, the convex ~urface 66 forming a piv~tal engagement with surface 58 of valve nember 26 which is also preferably flat or planar cver the en_ire extent thereof (Figures 1 and 4, or Figure 7). mi~
orientation ~revents excessive wear on the valve m~mber as well a~
possible wear of the guide fingers during compression of the ~e~f ~pring which coLld result from mGN~ment of edgPs 60 and 6? during sompression of leaf springs 56. Also, leaf springs 56 will prefer-ably have a nu~u3mlm diameter ~hen m a flattened fully compressad condition slightly less than the diameter of wear plate 50 and the ~nner surfaoe s 48 of guide f~ngers 44 will operate to F~event le~E
spring 56 from slipping oNe~ the edge thereof. It is also imço~tant that the ~Euu~m diameter of leaf spring 56 be selected to prcvide a slight minimal d earance with g,l de fingers 44 when F~x~rly centered so as to av~id the possibility of le f springs 56 becoming locked in a fully comp~essed condition. It should also be noted ~hat the use of such a continuous planar or flat upper surEa oe 58 on di~- _ charge valve 26 eliminates any Fotential points of stress concentration ~hich could possibly oontribute to val~e failure.
In operation, as the suction gas is campressed by cperation of the compressor the mcreasing pressure acting on the lower surface of valve mYnber 26 will cause it to m~ve upwardly (as shown~ ther~ky o$ening ~he compression chan~er to the discharge passage 18 and comr pressing leaf spring 56. The inn~r surfaoes 48 of guide fingers 44 ~ill oooperate with the cylindrical sidewall 68 of valve nember 26 to restrict or i ~ibit lateral mcvement thereof thereby maintaining prcper alignment of v21ve mem~er 25. Cbmpressive mDvement of le~f spring 56 into substantially full surfa oe contact wit'h sur~aoe 59 of '~
wear plate 50 will operate to provide a positive sbop thcr~by limiting 7S~3 the maximum opening of valve member 26. However, because as shown in Figure 6 the spring rate increases with increasing lift, the velocity at which the valve member moves into this maximum open position may be less than with a comparable fixed rate coil spring. Further, because of the variable spring rate offered by such leaf springs, it is possible to reduce the preloading on the valve member as shown on the graph of Figure 6 below that generally required for a comparable coil spring valve assembly. This may be particu-larly desirable for polymeric valve members of the type disclosed in above-identified Canadian Patent No. 1,179,575.
It should also be noted that it is possible to adjust both preloading and overall spring rate without altering the geometry or dimensions of the various components by merely inserting additional leaf springs 56. Additionally, when multiple leaf springs are employed such as is shown, there will be a slight relative movement between the engaged surfaces thereof during compression and relaxation. The frictional forces resulting from this movement will provide a damping action which is particularly desirable at high frequency operation to inhibit vibration of valve member 26. Also, the use of multiple leaf springs provides redundant biasing means thereby improving operating reliability.
It also appears that the use of leaf springs offers the advantage of quieter operation as compared with the use of coil springs.
While it will be apparent that the preferred embodiment of -the invention disclosed is well calculated to provide the advantages and features above stated, it will be appreciated that the invention is susceptible to modification, variation and change without departing from the proper scope or fair meaning of the subjoined claims.
mab/ `~!~
The present invention is particularly well suited for use in combiantion with the disc like lightweight valves of the type disclosed in assignee's copending Canadian appli-; cation Serial No. 341,333, filed December 6, 1979 and the head and valve plate of assignee's U.S. Patent No. 4,385,872 ! 10 and represents an alternative to the coil spring biasing arrangements of assignee's U.S. Patent No. 4,329,125. It may be used in both rotary and other types of compressors including single and multi-c~vlinder reciprocating piston type compressors of either hermetic or accessible hermetic type.
Valve plates and cylinder head assemblies can become relatively complex in configuration for certain valve arrangements and as a result may be quite costly to manu~acture and sometimes to assemble.
The present invention resides in a valve having means defining a fluid passage for increasing cross-sectional - area in the direction of fluid flow, the sidewalls of the passage defining a valve seat and there being a v~lve member having a peripheral edge adapted to sealingly engage the valve seat when the valve is closed.
According to the present invention, there is provided a valve assembly for use in compressors and including a valve plate adapted for controlling fluid from a compression chamber of the compressor and having a discharge opening therethrough. The opening may be circular and provided with milh /\ ~
` -sidewalls defining a valve seat with an increasing diameter in a direction away from the compressor chamber. The valve member is engageable with the valve seat to close the discharge opening, a specific form of this member being disc-shaped and formed of a compliant material such as polymeric material.
A leaf spring, which may be a bowed leaf spring formed of metal, is positioned in alignment with the valve member with the convex center portion thereof acting against the valve member and biasing into a closed position. A bridge member overlies the discharge opening and is fixed in position with respect to the valve plate, the bridge member having means defining guide surfaces extending into the opening and surrounding the peripheral edge of the valve member and the leaf spring so as to maintain the leaf spring and the valve member generally in alignment with one another and the discharge opening.
The guide surface is normally radially spaced from the peripheral edge of the leaf spring when the valve member is in a closed position, and the means defining the guide surfaces being spaced from the sidewalls of the opening so as to define a discharge passage therebetween.
In one embodiment of the invention, the bridge member, which is mounted in a fixed position with respect to the valve plate, includes a stop surface formed of a relatively hard material engaging the outer periphery of the bowed leaf spring to urge the valve member into the closed position, the guide member having guide surfaces normally radially spaced from the peripheral edge of the leaf spring a sufficient distance so as to accommodate radial movement of the leaf spring and the means defining the guide surfaces being spaced ~ ~ - 2 -- ~Z1475B
from the sidewalls of the opening whereby a discharge gas flow path is provided therebetween.
Additional advantages and features of the present invention will become apparent from the subsequent description and the appended claims taken in conjunction with the accompanying drawings.
Brief Description of the Drawinqs Figure 1 is a fragmentary section view of a portion of a refrigeration compressor showing a valve plate assembly in accordance with the present invention;
Figure 2 is a fragmentary plan view of the valve plate assembly of Figure l;
Figures 3 and 4 are section views of the valve plate assembly of Figure 1, the sections being taken along lines 3-3 and 4-4 respectively thereof;
Figure 5 is a perspective view of a leaf spring member designed for use in the valve plate assembly of the present invention;
Figure 6 is a graph plotting the relationship between biasing force and lift for both the leaf spring forming a part of the present invention and a conventional coil spring;
and 2a -, ! ) 75~3 Figu~e 7 is a p~rspective view of the discharge valve shown in Figure 1.
Description of the Preferred ~mbodiment ~ eferring ncw to the drawings and in particular tD Figure 1 thereof, there is shcwn a valve plate as~embly 10 in accordance wi~h the present invention and cc~prising a valve plate 12 having a ring valve seat n~mber 14 positioned within a generally conically shaped opening provided therein so as to define ~ubstantially concentric suction and discharge gas pRssages 16 and 18 respectively therethrough.
lQ A second plate nEmber 30 is positicned on the upper surface o~ valve plate 1~ ~ith a suitable seal mg gasket 22 dispDsed therebetween ~o as 1~D isolate suctian and discharge gas passages 16 and 18. An cq?en-ing 24 iq provided extending thrcugh plate 20 which is adapted to allow discharge gas to pass upwardly tas shown) therethrough. The Yalve plate assembly as described thus far is substantially identical tD the vzlve pla~e assembly described in detail in as~ignee's-U.S. Patent No. dl,385,872.
A lightweight compliant polymeric discharge valve member 26is also provided seated against conical surfac~ 28 which defines a valve seat wit n discharge passage 18. Discharge valve 26 is pre-ferably of the gener~l type described in detail in assignee's Canadian Patent 1,179,575, issued December 18, 1984.
A bridge nEmber 30 is prcvided having a generally ~ylindri-cally ~haped central portion 32 positioned approximately coaxially with cFening 24 and a pQir of dia~.etrically outwardly eKtending arms 34 ana 36 are secured to the upper surface 38 of plate ~e~ber 20 by means of bolts 40 and 42 extending through openings provided in axms 34 and 36 and into thread~d engayement with suitably position~1 ......
, . ~
7S~ ~
.
.
openings provided in plate member 20. Central portion 32 of bridge m~ber is of a diameter substantially less than the diameter of op~ning 24 provided in plate n~mber 20 so as to leave a su`bstantially unrestricted area for passage of discharge gas and also includes a plurality o~
substantially identical circ~nferentially spaced depending guide fingers 44 projecting through op~mng 24 and into discharge passage lB
in valve plate 12. m e lcwer surface 46 of each of guide fingers 44 is beveled or inclined so as to enaole it to be positioned in very close, slightly spaced relationship to valve seat surEace 28 of ring me~ker 14. The inwardly facing surface 48 of each of guide ~ingers 44 has a conrave shape defining segments of a cylinder having a diam.eter slightly greater than that of valve ne~ber 26 so as to provide a clearance there~etween. .
A wear plate nemker 50 is also provided positioned in ~ngaging relationship with under surface 52 of bridge me~ber 30. Wear plate nY~er 50 has a generally circular shap with a diameter approx~mately equal to the diameter of the central portion of bridga mem~er and ~-includes a plurality of flat edge surfaces 54 positioned adjacent each of the guide fingers 44 and ccoperating therewith so as to prevent relative rotation of the wear plate.
In order to bias valve member into ~ closed position as ~h~n a pair of substantially identical leaf springs 56 of the cNrved disc -type ~-e provided being positioned between upper surEace 58 of valve nemker 26 and lower s~rface 59 of wear plate 50. As best seen with reference to Fig~re 5, leaf springs 56 are each in the for~ of rela-tively thin metal discs having diametrically opposite edges 60 and 62 b~wed upwardly as shcwn therein so as to define a generally arcuate ~.
shape in transverse cross section. As clearly sha~n in Figure 4, leaf springs 56 do not have any opEnings providea therein and are -- 4 -- .
.
~, ~ 7~
positioned with ~oncave 6urfa oe 64 ~acing lower surface 59 of waar plate 50, the convex ~urface 66 forming a piv~tal engagement with surface 58 of valve nember 26 which is also preferably flat or planar cver the en_ire extent thereof (Figures 1 and 4, or Figure 7). mi~
orientation ~revents excessive wear on the valve m~mber as well a~
possible wear of the guide fingers during compression of the ~e~f ~pring which coLld result from mGN~ment of edgPs 60 and 6? during sompression of leaf springs 56. Also, leaf springs 56 will prefer-ably have a nu~u3mlm diameter ~hen m a flattened fully compressad condition slightly less than the diameter of wear plate 50 and the ~nner surfaoe s 48 of guide f~ngers 44 will operate to F~event le~E
spring 56 from slipping oNe~ the edge thereof. It is also imço~tant that the ~Euu~m diameter of leaf spring 56 be selected to prcvide a slight minimal d earance with g,l de fingers 44 when F~x~rly centered so as to av~id the possibility of le f springs 56 becoming locked in a fully comp~essed condition. It should also be noted ~hat the use of such a continuous planar or flat upper surEa oe 58 on di~- _ charge valve 26 eliminates any Fotential points of stress concentration ~hich could possibly oontribute to val~e failure.
In operation, as the suction gas is campressed by cperation of the compressor the mcreasing pressure acting on the lower surface of valve mYnber 26 will cause it to m~ve upwardly (as shown~ ther~ky o$ening ~he compression chan~er to the discharge passage 18 and comr pressing leaf spring 56. The inn~r surfaoes 48 of guide fingers 44 ~ill oooperate with the cylindrical sidewall 68 of valve nember 26 to restrict or i ~ibit lateral mcvement thereof thereby maintaining prcper alignment of v21ve mem~er 25. Cbmpressive mDvement of le~f spring 56 into substantially full surfa oe contact wit'h sur~aoe 59 of '~
wear plate 50 will operate to provide a positive sbop thcr~by limiting 7S~3 the maximum opening of valve member 26. However, because as shown in Figure 6 the spring rate increases with increasing lift, the velocity at which the valve member moves into this maximum open position may be less than with a comparable fixed rate coil spring. Further, because of the variable spring rate offered by such leaf springs, it is possible to reduce the preloading on the valve member as shown on the graph of Figure 6 below that generally required for a comparable coil spring valve assembly. This may be particu-larly desirable for polymeric valve members of the type disclosed in above-identified Canadian Patent No. 1,179,575.
It should also be noted that it is possible to adjust both preloading and overall spring rate without altering the geometry or dimensions of the various components by merely inserting additional leaf springs 56. Additionally, when multiple leaf springs are employed such as is shown, there will be a slight relative movement between the engaged surfaces thereof during compression and relaxation. The frictional forces resulting from this movement will provide a damping action which is particularly desirable at high frequency operation to inhibit vibration of valve member 26. Also, the use of multiple leaf springs provides redundant biasing means thereby improving operating reliability.
It also appears that the use of leaf springs offers the advantage of quieter operation as compared with the use of coil springs.
While it will be apparent that the preferred embodiment of -the invention disclosed is well calculated to provide the advantages and features above stated, it will be appreciated that the invention is susceptible to modification, variation and change without departing from the proper scope or fair meaning of the subjoined claims.
mab/ `~!~
Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An improved valve assembly for use in compres-sors, comprising:
a valve plate adapted for controlling fluid from a compression chamber of said compressor and having a circularly shaped discharge opening therethrough, the sidewalls of said opening defining a valve seat having an increasing diameter in a direction away from said compression chamber;
a disc shaped valve member positioned within said opening for movement to and from a closed position in which it is in sealing engagement with said valve seat, said valve member being formed of a compliant polymeric material;
a bowed leaf spring formed of metal and positioned in alignment with said valve member, the convex center portion of said leaf spring acting against said valve member and biasing it into a closed position; and a bridge member overlying said discharge opening and fixed in position with respect to said valve plate, said bridge member having means defining guide surfaces extending into said opening and surrounding the peripheral edge of said valve member and said leaf spring so as to maintain said leaf spring and valve member generally in alignment with one another and said discharge opening, said guide surfaces being normally radially spaced from the peripheral edge of said leaf spring when said valve member is in a closed position, and said means defining said guide surfaces being spaced from the sidewalls of said opening so as to define a discharge passage therebetween.
a valve plate adapted for controlling fluid from a compression chamber of said compressor and having a circularly shaped discharge opening therethrough, the sidewalls of said opening defining a valve seat having an increasing diameter in a direction away from said compression chamber;
a disc shaped valve member positioned within said opening for movement to and from a closed position in which it is in sealing engagement with said valve seat, said valve member being formed of a compliant polymeric material;
a bowed leaf spring formed of metal and positioned in alignment with said valve member, the convex center portion of said leaf spring acting against said valve member and biasing it into a closed position; and a bridge member overlying said discharge opening and fixed in position with respect to said valve plate, said bridge member having means defining guide surfaces extending into said opening and surrounding the peripheral edge of said valve member and said leaf spring so as to maintain said leaf spring and valve member generally in alignment with one another and said discharge opening, said guide surfaces being normally radially spaced from the peripheral edge of said leaf spring when said valve member is in a closed position, and said means defining said guide surfaces being spaced from the sidewalls of said opening so as to define a discharge passage therebetween.
2. An improved valve assembly for use in compressors, comprising:
a valve plate adapted for controlling fluid flow from a compression chamber of said compressor and having a circularly shaped discharge opening therethrough, the sidewalls of said opening defining a valve seat having an increasing diameter in a direction away from said compression chamber;
a disc-shaped valve member positioned within said opening for movement to and from a closed position in which it is in sealing engagement with said valve seat, said valve member being formed of a compliant material and having a substantially flat surface opposite said compression chamber;
a bowed leaf spring formed of metal and positioned in alignment with said valve member, the convex center portion of said leaf spring being wholly imperforate and normally acting against said flat surface on said valve member generally along a substantially straight line and biasing it into a closed position; and a bridge member overlying said discharge opening and fixed in position with respect to said valve plate, said bridge member having means defining a plurality of spaced guide surfaces extending into said opening and surrounding the peripheral edge of said valve member and said leaf spring so as to maintain said leaf spring and valve member generally in alignment with one another and said discharge opening, said guide surfaces being normally radially spaced from the peripheral edge of said leaf spring when said valve member is in a closed position a sufficient distance to accommodate radial movement of said leaf spring and said means defining said guide surfaces being axially and radially spaced from the sidewalls of said opening so as to define a discharge gas flow path therebetween.
a valve plate adapted for controlling fluid flow from a compression chamber of said compressor and having a circularly shaped discharge opening therethrough, the sidewalls of said opening defining a valve seat having an increasing diameter in a direction away from said compression chamber;
a disc-shaped valve member positioned within said opening for movement to and from a closed position in which it is in sealing engagement with said valve seat, said valve member being formed of a compliant material and having a substantially flat surface opposite said compression chamber;
a bowed leaf spring formed of metal and positioned in alignment with said valve member, the convex center portion of said leaf spring being wholly imperforate and normally acting against said flat surface on said valve member generally along a substantially straight line and biasing it into a closed position; and a bridge member overlying said discharge opening and fixed in position with respect to said valve plate, said bridge member having means defining a plurality of spaced guide surfaces extending into said opening and surrounding the peripheral edge of said valve member and said leaf spring so as to maintain said leaf spring and valve member generally in alignment with one another and said discharge opening, said guide surfaces being normally radially spaced from the peripheral edge of said leaf spring when said valve member is in a closed position a sufficient distance to accommodate radial movement of said leaf spring and said means defining said guide surfaces being axially and radially spaced from the sidewalls of said opening so as to define a discharge gas flow path therebetween.
3. An improved valve assembly for use in com-pressors, comprising:
a valve plate adapted for controlling fluid flow from a compression chamber of said compressor and having a circularly shaped discharged opening therethrough, the sidewalls of said opening defining a valve seat having an increasing diameter in a direction away from said compression chamber;
a disc-shaped valve member positioned within said opening for movement to and from a closed position in which it is in sealing engagement with said valve seat, said valve member being formed of a compliant material and having a substantially flat surface opposite said compression chamber;
a bowed leaf spring formed of metal and positioned in alignment with said valve member, the convex center portion of said leaf spring being wholly imperforate and normally acting against said flat surface on said valve member generally along a substantially straight line and biasing it into a closed position; and a bridge member mounted in a fixed position with respect to said valve plate, said bridge member including a stop surface formed of a relatively hard material engaging the outer periphery of said bowed leaf spring to urge said valve member into said closed position, said bridge member having guide surfaces normally radially spaced from the peripheral edge of said leaf spring a sufficient distance so as to accom-modate radial movement of said leaf spring and said means defining said guide surfaces being spaced from the sidewalls of said opening whereby a discharge gas flow path is provided therebetween.
a valve plate adapted for controlling fluid flow from a compression chamber of said compressor and having a circularly shaped discharged opening therethrough, the sidewalls of said opening defining a valve seat having an increasing diameter in a direction away from said compression chamber;
a disc-shaped valve member positioned within said opening for movement to and from a closed position in which it is in sealing engagement with said valve seat, said valve member being formed of a compliant material and having a substantially flat surface opposite said compression chamber;
a bowed leaf spring formed of metal and positioned in alignment with said valve member, the convex center portion of said leaf spring being wholly imperforate and normally acting against said flat surface on said valve member generally along a substantially straight line and biasing it into a closed position; and a bridge member mounted in a fixed position with respect to said valve plate, said bridge member including a stop surface formed of a relatively hard material engaging the outer periphery of said bowed leaf spring to urge said valve member into said closed position, said bridge member having guide surfaces normally radially spaced from the peripheral edge of said leaf spring a sufficient distance so as to accom-modate radial movement of said leaf spring and said means defining said guide surfaces being spaced from the sidewalls of said opening whereby a discharge gas flow path is provided therebetween.
4. An improved valve assembly as claimed in claim 3, wherein said valve member and leaf spring cooperate with one another so that no peripheral edge of said leaf spring is ever in a position to cause damaging wear on said flat surface of said valve element.
5. An improved valve plate assembly for use in a compressor, said valve plate assembly comprising:
a valve plate adapted to be positioned between a head and a body in overlying relationship to a compression chamber defined by said body and having a discharge opening extending therethrough communicating with said chamber and means defining a valve seat;
a valve member engageable with said valve seat to close said discharge opening;
leaf spring biasing means having a centrally disposed convex surface facing the downstream face of said valve member for biasing said valve member into sealing engage-ment with said valve seat; and a bridge member secured in overlying relationship to said discharge opening and supporting said leaf spring in biasing relationship with said valve member to bias said valve member into a closed position, said bridge member further including a plurality of spaced depending guide fingers positioned in opposed relationship to the periphal edge of said leaf spring and said valve member and operative to restrict lateral movement thereof; said guide fingers being spaced from the sidewalls defining said opening so as to define a discharge gas flow path therebetween.
a valve plate adapted to be positioned between a head and a body in overlying relationship to a compression chamber defined by said body and having a discharge opening extending therethrough communicating with said chamber and means defining a valve seat;
a valve member engageable with said valve seat to close said discharge opening;
leaf spring biasing means having a centrally disposed convex surface facing the downstream face of said valve member for biasing said valve member into sealing engage-ment with said valve seat; and a bridge member secured in overlying relationship to said discharge opening and supporting said leaf spring in biasing relationship with said valve member to bias said valve member into a closed position, said bridge member further including a plurality of spaced depending guide fingers positioned in opposed relationship to the periphal edge of said leaf spring and said valve member and operative to restrict lateral movement thereof; said guide fingers being spaced from the sidewalls defining said opening so as to define a discharge gas flow path therebetween.
6. A valve plate assembly as set forth in claim 5 wherein said leaf spring comprises a bowed disc member having a convex surface and a concave surface, a portion of said convex surface engaging said valve member.
7. A valve plate assembly as set forth in claim 6 wherein said valve member has a continuous substantially planar upper surface engaging said biasing means.
8. An improved valve assembly for use in comp-ressors comprising:
a valve plate adapted for controlling fluid flow to and from a compression chamber of said compressor, said valve plate having a ciruclarly shaped discharge opening therethrough, the sidewalls of said opening defining a valve seat having an increasing diameter in a direction away from said compression chamber;
a disc shaped valve member movably positioned within said opening and in sealing engagement with said valve seat when in a closed position;
a bowed leaf spring having a centrally disposed convex surface facing the downstream face of said valve member for biasing said valve member into said closed position; and a bridge member secured to said valve plate, said bridge member having guide means extending into said opening and surrounding the peripheral edges of said valve member and said bowed leaf spring so as to maintain said leaf spring and valve member in alignment, said guide means being spaced from said sidewalls so as to define a discharge gas flow path therebetween, said bridge member supporting said bowed leaf spring so as to urge said valve member into said closed position and including a stop surface engageable with said bowed leaf spring and positioned a predetermined distance from said valve member to limit opening movement thereof.
a valve plate adapted for controlling fluid flow to and from a compression chamber of said compressor, said valve plate having a ciruclarly shaped discharge opening therethrough, the sidewalls of said opening defining a valve seat having an increasing diameter in a direction away from said compression chamber;
a disc shaped valve member movably positioned within said opening and in sealing engagement with said valve seat when in a closed position;
a bowed leaf spring having a centrally disposed convex surface facing the downstream face of said valve member for biasing said valve member into said closed position; and a bridge member secured to said valve plate, said bridge member having guide means extending into said opening and surrounding the peripheral edges of said valve member and said bowed leaf spring so as to maintain said leaf spring and valve member in alignment, said guide means being spaced from said sidewalls so as to define a discharge gas flow path therebetween, said bridge member supporting said bowed leaf spring so as to urge said valve member into said closed position and including a stop surface engageable with said bowed leaf spring and positioned a predetermined distance from said valve member to limit opening movement thereof.
9. A valve assembly as set forth in claim 8 wherein the end surface of each of said guide means is positioned in closely spaced substantially parallel relationship with said sidewalls.
10. A valve assembly as set forth in claim 8 wherein a convex surface of the leaf spring has a portion pivotably engaging said valve member.
11. A valve assembly as set forth in claim 8 wherein said guide means are operative to retain said leaf spring in position.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US23434381A | 1981-02-13 | 1981-02-13 | |
| US234,343 | 1981-02-13 | ||
| US31805381A | 1981-11-04 | 1981-11-04 | |
| US318,053 | 1981-11-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1214758A true CA1214758A (en) | 1986-12-02 |
Family
ID=26927829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000395485A Expired CA1214758A (en) | 1981-02-13 | 1982-02-03 | Discharge valve assembly |
Country Status (6)
| Country | Link |
|---|---|
| AR (1) | AR227575A1 (en) |
| BR (1) | BR8200765A (en) |
| CA (1) | CA1214758A (en) |
| DE (1) | DE3204356A1 (en) |
| GB (1) | GB2094442B (en) |
| MX (1) | MX155895A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4469126A (en) * | 1981-11-04 | 1984-09-04 | Copeland Corporation | Discharge valve assembly for refrigeration compressors |
| US4625296A (en) * | 1984-01-17 | 1986-11-25 | The Perkin-Elmer Corporation | Memory refresh circuit with varying system transparency |
| IT1182601B (en) * | 1985-10-10 | 1987-10-05 | Aspera Spa | VALVE BODY FOR HERMETIC MOTOR-COMPRESSOR FOR REFRIGERANT FLUIDS |
| US4681132A (en) * | 1986-05-23 | 1987-07-21 | Halkey-Roberts Corporation | Check valve with preset cracking pressure |
| BR9002787A (en) * | 1990-06-08 | 1991-12-10 | Brasil Compressores Sa | VALVE FOR HERMETIC COMPRESSOR |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1914495A (en) * | 1927-12-23 | 1933-06-20 | Sullivan Machinery Co | Valve mechanism |
| US2025240A (en) * | 1934-10-20 | 1935-12-24 | Universal Cooler Corp | Refrigerant gas compressor |
| US2070659A (en) * | 1935-08-15 | 1937-02-16 | Universal Cooler Corp | Compressor valve |
| AT193214B (en) * | 1955-12-10 | 1957-11-25 | R U L Schmidthuber Plattenvent | Plate valve |
| CH413196A (en) * | 1963-03-09 | 1966-05-15 | Inst Chemie Und Kaelteausruest | Strip valve of reciprocating compressors |
| CA1179575A (en) * | 1978-12-20 | 1984-12-18 | Robert W. King | Valve assembly |
| US4329125A (en) * | 1980-01-22 | 1982-05-11 | Copeland Corporation | Discharge valve |
| US4385872A (en) * | 1980-01-22 | 1983-05-31 | Copeland Corporation | Compressor |
-
1982
- 1982-02-03 CA CA000395485A patent/CA1214758A/en not_active Expired
- 1982-02-05 GB GB8203368A patent/GB2094442B/en not_active Expired
- 1982-02-09 DE DE19823204356 patent/DE3204356A1/en active Granted
- 1982-02-12 MX MX19136382A patent/MX155895A/en unknown
- 1982-02-12 BR BR8200765A patent/BR8200765A/en not_active IP Right Cessation
- 1982-02-12 AR AR28842082A patent/AR227575A1/en active
Also Published As
| Publication number | Publication date |
|---|---|
| MX155895A (en) | 1988-05-18 |
| BR8200765A (en) | 1982-12-21 |
| GB2094442A (en) | 1982-09-15 |
| AR227575A1 (en) | 1982-11-15 |
| DE3204356C2 (en) | 1988-02-18 |
| GB2094442B (en) | 1985-05-30 |
| DE3204356A1 (en) | 1982-12-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |