JP2007537383A5 - - Google Patents

Claims (32)

  A body defining an internal space and an opening to the internal space; an operating element extending through the opening into the internal space; a sheath closing the opening and enclosing the operating element therein; A pump chamber defined between a body and the sheath, the sheath being deformable in response to a reciprocating movement of the operating element to cause a volume change in the pump chamber; A reciprocating pump comprising a cavity around the operating element adjacent to the open end of the sheath.   The reciprocating pump according to claim 1, wherein the cavity is an annular cavity.   The reciprocating pump according to claim 1 or 2, wherein the cavity is defined between the periphery of the operating element and an surrounding surface.   The reciprocating pump of claim 3, wherein the surrounding surface is defined by a reinforcing sleeve located in a recess in the sheath.   The reciprocating pump according to claim 4, wherein the reinforcing sleeve supports a wear ring that slidably engages the operating element.   The reciprocating pump according to claim 3, wherein the surrounding surface is defined at an open end portion of the sheath.   The reciprocating pump according to claim 6, wherein a reinforcing material for maintaining an open state spaced from the operating element is incorporated in the open end portion of the sheath.   The reciprocating pump according to any one of claims 1 to 7, wherein the cavity is closed at an outer end thereof by a seal.   The reciprocating pump according to any one of claims 1 to 8, wherein the operating element is configured as a plunger.   The reciprocating pump according to any one of claims 1 to 9, wherein a mounting flange is provided at the open end of the sheath.   The said sheath is provided with the 1st part which does not deform | transform fundamentally, and the 2nd part which surrounds the said plunger and expands and contracts with the reciprocating motion of the said plunger. The reciprocating pump described in 1.   The reciprocating pump according to claim 11, wherein the mounting flange is provided in the first portion.   The reciprocating pump according to claim 11 or 12, wherein the cavity is provided within the range of the first portion.   The reciprocating pump according to claim 11, wherein the second portion includes a surface that contacts the plunger.   The reciprocating pump of claim 14, wherein the surface is configured to contain a lubricant.   The reciprocating pump according to claim 15, wherein the surface has a storage shape as a configuration for storing the lubricant on the surface.   The reciprocating pump according to any one of claims 9 to 16, wherein an outer surface of the plunger is coated with polytetrafluoroethylene or a similar low friction material.   The reciprocating pump according to any one of claims 9 to 17, further comprising a supply unit for a lubricant contained in the sheath.   19. A reciprocating pump according to claim 18, wherein the supply means is configured to deliver lubricant to a region adjacent to the inner end of the sheath.   The reciprocating pump according to claim 19, wherein the supply means includes a lubricant delivery path provided in the operating element.   A body defining an internal space and an opening to the internal space; an operating element extending through the opening into the internal space; a sheath closing the opening and enclosing the operating element therein; A pump chamber defined between a main body and the sheath; a recess provided adjacent to an open end of the sheath; and a reinforcing sleeve positioned in the recess; the sheath comprising the pump chamber A reciprocating pump that is deformable in response to a reciprocating motion of the operating element to create a volume change therein, and wherein a cavity is defined between the reinforcing sleeve and the operating element.   The reciprocating pump of claim 21, wherein the reinforcing sleeve supports a wear ring that slidably engages the operating element.   23. A reciprocating pump according to claim 21 or 22, wherein the cavity is closed at its outer end by a seal.   A body defining an interior space and an opening to the interior space; a plunger extending through the opening into the interior space; a sheath closing the opening and enclosing the plunger inside; and the body A pump chamber defined between the sheath and the sheath, the sheath being deformable in response to a reciprocating movement of the operating element in order to produce a volume change in the pump chamber; And a second portion that surrounds the plunger and that expands and contracts as the plunger reciprocates, and the first portion is sandwiched and engaged with the main body. A reciprocating pump that defines a mounting flange.   A recess is provided in the first portion of the sheath adjacent to the open end portion of the sheath, a reinforcing sleeve is located in the recess, and a cavity is defined between the reinforcing sleeve and the plunger. The reciprocating pump according to claim 24.   A body defining an interior space and an opening to the interior space; a plunger extending through the opening into the interior space; a sheath closing the opening and enclosing the plunger inside; and the body A pump chamber defined between the sheath and the sheath, the sheath being deformable in response to a reciprocating movement of the operating element to cause a volume change in the pump chamber, the plunger A reciprocating pump comprising supply means for supplying lubricant in a region between the sheath and the sheath.   27. A reciprocating pump according to claim 26, wherein the supply means is configured to deliver a lubricant to a region adjacent the inner end of the sheath.   28. The reciprocating pump according to claim 27, wherein the supply means includes a lubricant delivery path provided in the plunger.   The sheath for reciprocating pumps as described in any one of Claims 1-28.   A first portion defining a mounting flange; and a second portion configured to surround a plunger received within the sheath, the second portion being responsive to reciprocation of the plunger. A sheath that is stretchable.   31. The sheath of claim 30, wherein the second portion includes a surface that abuts the plunger, the surface configured to contain a lubricant.   32. A sheath according to claim 30 or 31, comprising a recess in the first portion adjacent to an open end, the recess being adapted to receive a reinforcing sleeve.