Scroll-type machine with rotation controlling means and specific wrap shape

A scroll-type machine comprising:

• a fixed scroll member having a fixed spiral wrap;
• the profiles of the inner and outer flanks of said fixed wrap each being the involute of a plane geometric shape;
• a movable scroll member having a movable spiral wrap and being mounted for movement with respect to said fixed scroll member,
• the profiles of the inner and outer flanks of said movable wrap each being the involute of a plane geometric shape;
• said movable wrap being intermeshed with said fixed wrap so that when said movable wrap is moved with respect to said fixed wrap along a predetermined path fluid pockets of progressively changing volume are formed;
• and
• means for causing said movable wrap to move along said predetermined path, including
• rotation controlling means for restricting rotational movement of said movable scroll member with respect to said fixed scroll member by limiting it to a predetermined amount,
• the centers of the generating shapes of the profiles of the flanks of said fixed wrap being displaced from one another a sufficient distance to accommodate said predetermined amount of rotation and maintain sealing contact between said intermeshed wraps in all operative relative positions thereof.

A fixed scroll member and a movable scroll member for a scroll-type machine, a portion of said movable scroll member adapted to orbit with respect to said fixed scroll member with an eccentricity E, said movable scroll member having rotation controlling means affixed thereto at a point P, each of said scroll members including a scroll wrap having inner and outer surfaces based on a generating circle and defined by the following equations (cartesian coordinates):

• X=C(1+Doc.sup.2).sup.1/2 cos (Ar-arctan (Doc))
• Y=C(1+Doc.sup.2).sup.1/2 sin (Ar-arctan (Doc))
• where:
• ______________________________________ R = C(1 + Doc.sup.2).sup.1/2 Doc = Ar + K1(Am) Fixed Outer Scroll Surface Doc = Ar + (K2 - 1)Am Moving Outer Scroll Surface Doc = Ar + K2(Am) - T/C Fixed Inner Scroll Surface Doc = Ar + (K1 - 1)Am - T/C Moving Inner Scroll Surface Ar = Ac + B + 5(Pi)/2 Fixed Outer Scroll Surface Ar = Ac + B + 5(Pi)/2 + Am Moving Outer Scroll Surface Ar = Ac + B + 3(Pi)/2 Fixed Inner Scroll Surface Ar = Ac + B + 3(Pi)/2 + Am Moving Inner Scroll Surface ______________________________________
• Ap=Ar-arctan (Doc)
• Am=arcsin ([E/L] sin (Ac))
• Am=arcsin ([E/L] sin (Ac))
• K1=Modification amount added to fixed scroll outer flank divided by total modification between fixed outer and moving inner flanks
• K2=Modification amount added to fixed scroll inner flank divided by total modification between fixed inner and moving outer flanks
• Doc=Dummy variable
• Ac=Mapping increment angle
• B=angle from start of involute on orbiting base circle to the pivot pin center (polar)
• C=radius of base generating circle
• T=thicknes of scroll wrap
• E=C(Pi)-T
• L=Distance between geometric center of orbiting scroll and link pin center P
• Ac being incremented beginning with Ac such that Ar=0
• Nw=number of wraps=(Ar to end of scroll-Pi/2)/2(Pi)
• Stopping when Ac=2(Pi)(Nw)+Pi/2.

A fixed scroll member and a movable scroll member for a scroll-type machine, a portion of said movable scroll member adapted to orbit with respect to said fixed scroll member with an eccentricity E, said movable scroll member having rotation controlling means affixed thereto at a point P, each of said scroll members including a scroll wrap having inner and outer surfaces based on a generating circle and defined by the following equations (cartesian coordinates):

• X=C(1+Doc.sup.2).sup.1/2 cos (Ar-arctan (Doc))
• Y=C(1+Doc.sup.2).sup.1/2 sin (Ar-arctan (Doc))
• where:
• ______________________________________ R = C(1 + Doc.sup.2).sup.1/2 Doc = Ar + K1(Am) Fixed Outer Scroll Surface Doc = Ar + (K2 - 1)Am Moving Outer Scroll Surface Doc = Ar + K2(Am) - T/C Fixed Inner Scroll Surface Doc = Ar + (K1 - 1)Am - T/C Moving Inner Scroll Surface Ar = Ac + B + 5(Pi)/2 Fixed Outer Scroll Surface Ar = Ac + B + 5(Pi)/2 + Am Moving Outer Scroll Surface Ar = Ac + B + 3(Pi)/2 Fixed Inner Scroll Surface Ar = Ac + B + 3(Pi)/2 + Am Moving Inner Scroll Surface ______________________________________
• Ap=Ar-arctan (Doc)
• to calculate Am:
• (1)
• Xa=(E) cos (Ac+B+Pi)
• Ya=(E) sin (Ac+B+Pi)
• Xgb=Xa+(L) cos (B+Pi)
• Xc=x coordinate of point P
• Yc=y coordinate of point P
• Az=((Xc-Xa).sup.2 +(Yc-Ya).sup.2).sup.0.5
• Yu=(Xa-Xc)/Az
• Cc=arctan (Yu)
• Fl1=Fl2=1
• If (Ya-Yc)>0 then goto step 2
• Cc=2(pi)-Cc
• Fl1=-1
• (2)
• Xum=Xc+Lik(cos (Cc))
• If Xgb-Xum<0 then goto step 3
• Fl2=-1
• (3)
• Yu=(Az.sup.2 +Lik.sup.2 -L.sup.2)/2(Az)(Lik)
• Cb=(Fl1)(Fl2) arctan (Yu)
• Xb=Xc+Lik(cos (Cc+Cb))
• Yb=Yc+Lik(sin (Cc+Cb))
• Xgb=Xb
• Bb=arctan ((Xa-Xb)/L)
• If Ya-Yb>0 then goto step 4
• Bb=2(pi)-Bb
• (4)
• Am=B-Bb
• K1=Modification amount added to fixed scroll outer flank divided by total modification between fixed outer and moving inner flanks
• K2=Modification amount added to fixed scroll inner flank divided by total modification between fixed inner and moving outer flanks
• Doc=Dummy variable
• Ac=Mapping increment angle
• B=angle from start of involute on orbiting base circle to the pivot pin center (polar)
• C=radius of base generating circle
• T=thicknes of scroll wrap
• E=C(Pi)-T
• L=Distance between geometric center of orbiting scroll and link pin center P
• Ac being incremented beginning with Ac such that Ar=0
• Nw=number of wraps=(Ar to end of scroll-Pi/2)/2(Pi)
• Stopping when Ac=2(Pi)(Nw)+Pi/2.

A fixed scroll member and a movable scroll member for a scroll-type machine, a portion of said movable scroll member adapted to orbit with respect to said fixed scroll member with an eccentricity E, said movable scroll member having rotation controlling link affixed thereto at a point P, each of said scroll members including a scroll wrap having inner and outer surfaces based on a generating circle and being of a contour formed by an NC-type machine operating in accordance with the following routine:

• 1.
• If involute profile=inner surface then
• Ac=-B-3(Pi)/2+Au
• If involute profile=outer surface then
• Ac=-B-5(Pi)/2+Au
• 2.
• Xa=(E) cos (Ac+B+Pi)
• Ya=(E) sin (Ac+B+Pi)
• Xgb=Xa+(L) cos (B+Pi)
• Xc=x coordinate of point P
• Yc=y coordinate of point P
• Az=((Xc-Xa).sup.2 +(Yc-Ya).sup.2).sup.0.5
• Yu=(Xa-Xc)/Az
• Cc=arctan (Yu)
• Fl1=Fl2=1
• If (Ya-Yc)>0 then goto step 3
• Cc=2(pi)-Cc
• Fl1=-1
• 3.
• Xum=Xc+Lik(cos (Cc))
• If Xgb-Xum<0 then goto step 4
• Fl2=-1
• 4.
• Yu=(Az.sup.2 +Lik.sup.2 -L.sup.2)/2(Az)(Lik)
• Cb=(Fl1)(Fl2) arctan (Yu)
• Xb=Xc+Lik(cos (Cc+Cb))
• Yb=Yc+Lik(sin (Cc+Cb))
• Xgb=Xb
• Bb=arctan ((Xa-Xb)/L)
• If Ya-Yb>0 then goto step 5
• Bb=2(pi)-Bb
• 5.
• Am=B-Bb
• 6.
• Ar=Ac+B+5(Pi)/2-Pi(L1)+Am(L2)
• Doc=Ar+K(Am)(L3)+(K-1)(Am)(L2)-(T/C)(L1)
• R=C(1+Doc.sup.2).sup.1/2
• p=Ar-arctan (Doc)
• X=((R) cos (p)+[(T1) sin (Ar)]TT)L4
• Y=(R) sin (p)-[(T1) cos (Ar)]TT
• 7.
• Ac=Ac+Ai
• 8.
• If Ar=2(pi)(Nw)+Pi/2 then goto step 2
• 9.
• The procedure is complete
• where:
• E=Eccentricity=C(Pi)-T
• C=Generating circle radius
• L=Distance between geometric center of orbiting scroll and link pin center P
• Ac=Mapping angle
• K1=Modification amount added to fixed scroll outer flank divided by total modification between fixed outer and moving inner flanks
• K2=Modification amount added to fixed scroll inner flank divided by total modification between fixed inner and moving outer flanks
• R=Polar vector magnitude
• Ar=Roll angle
• Aro=Roll angle (Ar) on moving (orbiting) scroll
• Arf=Roll angle (Ar) on fixed scroll
• B=Angle from start of involute on orbiting base circle to the pivot pin center (polar)
• T=Scroll wrap thickness
• Ai=Increment angle (i.e., the angle by which AC is incremented)
• Au=Truncation angle (the angle from the x axis to a line perpendicular to a line tangent to the base generating circle and passing through the points of tangency of the physical inner end of a wrap and the involute curves from which its flanks were generated)
• T1=Tool radius
• D=Distance between base circle center and anchor pin center
• Lik=Length of rotation controlling link
• where logic coefficients are:
• ______________________________________ Surface:
• L1 L2 L3 L4 TT ______________________________________ Fixed inner 1 0 1 -1 -1 Fixed outer 0 0 1 -1 1 Moving inner 1 1 0 1 -1 Moving outer 0 1 0 1 1 ______________________________________

A fixed scroll member and a movable scroll member for a scroll-type machine a portion of said movable scroll member adapted to orbit with respect to said fixed scroll member with an eccentricity E, said movable scroll member having rotation controlling link affixed thereto at a point P, each of said scroll members including a scroll wrap having inner and outer surfaces based on a generating circle and being of a contour formed by an NC-type machine operating in accordance with the following routine:

• 1.
• If involute profile=inner surface then
• AC=-B-3(Pi)/2+Au
• If involute profile=outer surface then
• AC=-B-5(Pi)/2+Au
• 2.
• Am=arcsin [(E/L) sin (Ac)]
• 3.
• Ar=Ac+B+5(Pi)/2-Pi(L1)+Am(L2)
• Doc=Ar+K(Am)(L3)+(K-1)(Am)(L2)-(T/C)(L1)
• R=C(1+Doc.sup.2).sup.1/2
• p=Ar-arctan (Doc)
• X=((R) cos (p)+[(T1) sin (Ar)]TT)L4
• Y=(R) sin (p)-[(T1) cos (Ar)]TT
• 4.
• Ac=Ac+Ai
• 5.
• If Ar=2(pi)(Nw)+Pi/2 then go to step 2
• 6.
• The procedure is complete
• where:
• E=Eccentricity=C(Pi)-T
• C=Generating circle radius
• L=Distance between geometric center of orbiting scroll and link pin center P
• Ac=Mapping angle
• K1=Modification amount added to fixed scroll outer flank divided by total modification between fixed outer and moving inner flanks
• K2=Modification amount added to fixed scroll inner flank divided by total modification between fixed inner and moving outer flanks
• R=Polar vector magnitude
• Ar=Roll angle
• Aro=Roll angle (Ar) on moving (orbiting) scroll
• Arf=Roll angle (Ar) on fixed scroll
• B=Angle from start of involute on orbiting base circle to the pivot pin center (polar)
• T=Scroll wrap thickness
• Ai=Increment angle (i.e., the angle by which AC is incremented)
• Au=Truncation angle the angle from the x axis to a line perpendicular to a line tangent to the base generating circle and passing through the points of tangency of the physical inner end of a wrap and the involute curves from which its flanks were generated)
• T1=Tool radius
• D=Distance between base circle center and anchor pin center
• where logic coefficients are:
• ______________________________________ Surface:
• L1 L2 L3 L4 TT ______________________________________ Fixed inner 1 0 1 -1 -1 Fixed outer 0 0 1 -1 1 Moving inner 1 1 0 1 -1 Moving outer 0 1 0 1 1 ______________________________________

A scroll-type machine comprising:

• a fixed scroll member having a fixed spiral wrap,
• the profiles of the inner and outer flanks of said fixed wrap each being the involute of the same generating plane geometric shape;
• the center of said generating shape of the profile of said outer flank of said fixed wrap being displaced from the center of said generating shape of the profile of said inner flank of said fixed wrap;
• a second scroll member having a second spiral wrap,
• said second wrap being intermeshed with said first wrap so that when said wraps are moved relative to one another along a predetermined path fluid pockets of progressively changing volume are formed;
• and
• means for causing said relative movement along said predetermined path.

A scroll-type machine comprising:

• a first scroll member having a first spiral wrap;
• a second scroll member having a second spiral wrap and being mounted for movement with respect to said first scroll member,
• said second wrap being intermeshed with said first wrap so that when said second wrap is moved with respect to said first wrap along a predetermined path, fluid pockets of progressively changing volume are formed;
• and
• means for causing said second wrap to move along said predetermined path, including:
• drive means for causing a first point on said second scroll member to move in a generally circular orbital path with respect to said first scroll member, and
• rotation controlling means for restricting rotational movement of said second scroll member by limiting movement of a second point thereon to a substantially straight line path with respect to said first scroll member,
• at least one of said wraps being of non-uniform thickness throughout its length so that a seal is achieved between said wraps in all relative positions thereof.

A scroll-type machine comprising:

• a first scroll member having a first spiral wrap,
• the profiles of the inner and outer flanks of said first wrap each being the involute of a plane geometric shape;
• a second scroll member having a second spiral wrap and being mounted for movement with respect to said first scroll member,
• the profiles of the inner and outer flanks of said second wrap each being the involute of a plane geometric shape;
• said second wrap being intermeshed with said first wrap so that when said second wrap is moved with respect to said first wrap along a predetermined path fluid pockets of progressively changing volume are formed;
• and
• means for causing said second wrap to move along said predetermined path, including
• rotation controlling means for restricting rotational movement of said second scroll member with respect to said first scroll member by limiting it to a predetermined amount,
• the centers of the generating shapes of the profiles of the flanks of one of said wraps being displaced from one another a sufficient distance to accommodate said predetermined amount of rotation and maintain sealing contact between said intermeshed wraps in all operative relative positions thereof.

A scroll-type machine comprising:

• a first scroll member having a first spiral wrap,
• the profiles of the inner and outer flanks of said first wrap each being the involute of a circle;
• a second scroll member having a second spiral wrap and being mounted for movement with respect to said first scroll member,
• the profiles of the inner and outer flanks of said second wrap each being the involute of a circle;
• said second wrap being intermeshed with said first wrap so that when said second wrap is moved with respect to said first wrap along a predetermined path fluid pockets of progressively changing volume are formed;
• and
• means for causing said second wrap to move along said predetermined path, including
• drive means for causing a first point on said second scroll member to move in a generally circular orbital path with respect to said first scroll member, and
• rotation controlling means for restricting rotational movement of said second scroll member by limiting movement of a second point thereon to a substantially straight line path with respect to said first scroll member,
• the centers of the generating circles of the profiles of the flanks of one of said wraps being displaced from one another a sufficient distance to accommodate said predetermined amount of rotation and maintain sealing contact between said intermeshed wraps in all operative relative positions thereof.

A scroll type machine comprising:

• a fixed scroll member having a first spiral wrap;
• a movable scroll member having a second spiral wrap and being mounted for movement with respect to said fixed scroll member,
• a crankshaft driven for rotation about a first axis, said crankshaft having an axial bore a portion of which defines a cylindrical driving surface having an axis of curvature parallel to said first axis;
• a drive element having an inner bore and having a cylindrical driven surface in driving engagment with said driving surface;
• a hub on said movable scroll member having a cylindrical outer surface journalled onto said drive element inner bore for rotation with respect thereto about a third axis spaced from and parallel to said first axis, whereby rotation of said crankshaft causes said third axis on said movable scroll member to orbit relative to said fixed scroll member about said first axis;
• and
• rotation controlling means for restricting rotational movement of said second scroll member with respect to said first scroll member by limiting it to a predetermined amount.

A scroll-type machine comprising:

• a first scroll member having a first spiral wrap,
• the profiles of the inner and outer flanks of said first wrap each being the involute of the same generating plane geometric shape;
• the center of said generating shape of the profile of said outer flank of said first wrap being displaced from the center of said generating shape of the profile of said inner flank of said first wrap;
• a second scroll member having a second spiral wrap,
• said second wrap being intermeshed with said first wrap so that when said wraps are moved relative to one another along a predetermined path fluid pockets of progressively changing volume are formed;
• and
• means for causing said relative movement along said predetermined path.

A scroll-type machine comprising:

• a first scroll member having a first spiral wrap with inner and outer flanks having a profile which is the involute of a circle;
• a second scroll member having a second spiral wrap with inner and outer flanks having a profile which is the involute of a circle and being mounted for movement with respect to said first scroll member,
• said second wrap being intermeshed with said first wrap so that when said second wrap is moved with respect to said first wrap along a predetermined path, fluid pockets of progressively changing volume are formed and wherein the center of the generating base circle for the involute profile of the outer flank of one of said wraps is displaced from the center of the generating base circle for the involute profile of the inner flank of the same wrap;
• and
• means for causing said second wrap to move along said predetermined path, including:
• drive means for causing a first point on said second scroll member to move in a generally circular orbital path with respect to said first scroll member, and
• rotation controlling means for restricting rotational movement of said second scroll member by limiting movement of a second point thereon to a substantially straight line path with respect to said first scroll member.

A scroll-type machine comprising:

• a first scroll member having a first spiral wrap with inner and outer flanks having a profile which is the involute of a circle;
• a second scroll member having a second spiral wrap with inner and outer flanks having a profile which is the involute of a circle and being mounted for movement with respect to said first scroll member,
• said second wrap being intermeshed with said first wrap so that when said second wrap is moved with respect to said first wrap along a predetermined path, fluid pockets of progressively changing volume are formed and wherein the center of the generating base circle for the involute profile of the outer flank of both of said wraps is displaced from the center of the generating base circle for the involute profile of the inner flank of the same wrap;
• and
• means for causing said second wrap to move along said predetermined path, including:
• drive means for causing a first point on said second scroll member to move in a generally circular orbital path with respect to said first scroll member, and
• rotation controlling means for restricting rotational movement of said second scroll member by limiting movement of a second point thereon to a substantially straight line path with respect to said first scroll member.

A scroll-type machine comprising:

• a first scroll member having a first spiral wrap,
• the profiles of the inner and outer flanks of said first wrap each being the involute of a plane geometric shape;
• a second scroll member having a second spiral wrap and being mounted for movement with respect to said first scroll member,
• the profiles of the inner and outer flanks of said second wrap each being the involute of a plane geometric shape;
• said second wrap being intermeshed with said first wrap so that when said second wrap is moved with respect to said first wrap along a predetermined path, fluid pockets of progressively changing volume are formed;
• and
• means for causing said second wrap to move along said predetermined path, including:
• rotation controlling means for restricting rotational movement of said second scroll member with respect to said first scroll member by limiting it to a predetermined amount,
• the centers of the generating shapes of the profiles of the flanks of both of said wraps being displaced from one another a sufficient distance to accommodate said predetermined amount of rotation and maintain sealing contact between said intermeshed wraps in all operative relative positions thereof, the amount of displacement of the center of the generating shapes of the profiles of said wraps being governed by the following relationship:
• displacement of the center of the generating shape of said first scroll wrap outer flank=(X) (Rmax)
• displacement of the center of the generating shape of said second scroll wrap inner flank=(1-X) (Rmax)
• displacement of the center of the generating shape of said first scroll wrap inner flank=(Y) (Rmax)
• displacement of the center of the generating shape of said second scroll wrap outer flank=(1-Y) (Rmax)
• where
• X is the percentage proportion of displacement desired on the outer flank of the first scroll wrap,
• Y is the percentage proportion of displacement desired on the inner flank of the first scroll wrap, and
• (Rmax) is the maximum distance to accommodate said predetermined amount of rotation of said second scroll member with respect to said first scroll member.