润滑科技信息平台

专利摘要

一种用于正排量泵的流体保持装置,该正排量泵用于将流体从供给源输送至目标,包括(i)密封装置,该密封装置被构造成容纳在泵的填充室中并且可配合地容纳穿过其中的泵的活塞,活塞在泵的活塞中往复运动。传送室,用于产生流体的抽吸和排出以用于传送流体,以及(ii)泄漏遏制装置,其构造成容纳从传送室传送的泄漏流体。该密封装置的特征在于:由耐磨且基本上抗变形的复合聚合物材料制成的管状主体和成形有直径减小的相对端部的通道,以与活塞形成密封摩擦配合。该泄漏遏制装置具有与密封装置的通道流体连通并容纳穿过其中的活塞的腔体,以及与该腔体流体连通用于释放泄漏流体的排出端口。 ......

基本信息

专利类型:
发明专利
申请/专利号:
CA3206980
申请日期:
2023-07-19
专利申请人:
分类号:
-
发明/设计人:
FROEHLER, ANTHONY STEVEN | KEMP, MATTHEW EDWARD
权利要求: 3. CLAIMS: 1. A fluid retention apparatus for a positive displacement pump, wherein the positive displacement pump has: a piston extending along an axis between opposite ends thereof, wherein the piston is substantially cylindrical and has an outer surface having a diameter transverse to the axis; a prime mover operatively connected to the piston and configured to displace the piston in reciprocating linear movement along the axis of the piston; a fluidic interconnection device configured to fluidically interconnect a supply having a fluid to be pumped, a target for receiving the fluid and the piston to effect the transfer from the supply to the target, wherein the fluidic interconnection device includes a housing, an inlet port supported by the housing and configured for fluidic communication with the supply and an outlet port supported by the housing and configured for fluidic communication with the target, wherein the fluidic interconnection device is configured to provide a flow of the fluid through the housing from the inlet port to the outlet port; wherein the fluidic interconnection device further includes a transfer chamber in the housing intermediate the inlet and outlet ports relative to the flow of the fluid through the housing for receiving the piston in the reciprocating linear movement thereof, whereby the piston acts a plunger to transfer the fluid from the supply to the target; wherein the fluidic interconnection device further includes a packing chamber adjacent the transfer chamber and remote to the flow of the fluid for receiving a sealing body to fluidically seal the transfer chamber at an interface with the piston, wherein the piston passes through the packing chamber and into the transfer chamber to provide an end portion of the piston defining a terminal end thereof, distal to the prime mover, for movement within the transfer chamber; the fluid retention apparatus comprising: a tubular body forming the sealing body and extending along an axis from a first end to a second end, wherein the tubular body is configured for insertion into the packing chamber; wherein the tubular body is made from a composite polymeric material which is wearable and substantially resistant to deformation under mechanical pressure; a passageway in the tubular body and extending along the axis thereof, wherein the passageway opens at the first and second ends of the tubular body and is configured to substantially matably receive the piston therethrough, wherein the passageway comprises a first end portion at the first end of the tubular body, a second end portion at the second end of the tubular body and an intermediate portion therebetween, wherein the intermediate portion is generally cylindrical and the first and second end portions have reduced diameter relative thereto, wherein a diameter of the intermediate portion is sized larger than the diameter of the piston to form a circumferential gap between the intermediate portion of the passageway and the piston, wherein prescribed diameters of the first and second end portions are sized smaller than the diameter of the piston such that the first and second end portions form seals around the piston by friction fit to resist passage of the fluid; annular recesses in the first and second ends of the tubular body between openings of the passageway and an outer surface of the tubular body arranged to face walls of the packing chamber, wherein each of the annular recesses has a base spaced from a corresponding one of the first and second ends of the tubular body in an axial direction of the tubular body and opposite sidewalls interconnecting the base and the corresponding one of the first and second ends and which are spaced apart in a diametric direction of the tubular body; a biasing device configured to be located in the annular recess in the first end, wherein the biasing device has opposite sides configured to be urged apart when the biasing device is in a biased condition; wherein, in the annular recess in the first end, the biasing device is arranged in the biased condition with the opposite sides thereof arranged to engage the sidewalls of said annular recess to exert force thereon directed radially of the tubular body, whereby the first end portion of the passageway is urged radially inwardly to exert pressure on the piston to enhance the seal therearound to resist leakage of the fluid from the transfer chamber and into the passageway of the tubular body; and a sealing gasket disposed in the annular recess in the second end and configured to form a fluidic seal with a downstream closure component configured to retain the sealing body in the packing chamber. 2. The fluid retention apparatus of claim 1 wherein the composite polymeric material comprises polytetrafluoroethylene substantially reinforced with carbon. 3. The fluid retention apparatus of claim 1 or 2 wherein the prescribed diameter of the first end portion is smaller than the prescribed diameter of the second end portion. 4. The fluid retention apparatus of any one of claims 1 to 3 wherein the first and second end portions are tapered from the diameter of the intermediate portion to the prescribed diameters thereof. 5. The fluid retention apparatus of claim 4 wherein the first end portion is tapered over a larger axial distance than the second end portion. 6. The fluid retention apparatus of any one of claims 1 to 5 wherein an end portion of the outer surface of the tubular body at the first end is flared outwardly to seal with the packing chamber by friction fit. 7. The fluid retention apparatus of any one of claims 1 to 6 wherein the tubular body further includes one or more annular recesses at axially spaced locations on the outer surface of the tubular body and one or more sealing gaskets received therein and arranged for engaging the packing chamber. 8. The fluid retention apparatus of any one of claims 1 to 7 further including a leak containment device forming the downstream closure component, wherein the leak containment device forms a cavity configured to receive the piston therethrough and for fluidic communication with the passageway of the tubular body and to receive the fluid that has leaked into the passageway from the transfer chamber, wherein the cavity extends along an axis from an open end arranged in fluidic communication with the passageway of the tubular body and a substantially closed end forming a substantially sealed interface with the piston, and wherein the leak containment device includes a drain port in fluidic communication with the cavity and configured for selectively communicating the cavity with an external vessel for receiving the fluid that has leaked. 9. The fluid retention apparatus of claim 8 wherein the drain port forms a passageway in communication with the cavity and extending transversely relative to the axis of the leak containment device arranged to be coaxial with the axis of the tubular body. 10. The fluid retention apparatus of claim 8 or 9 wherein the leak containment device comprises a first fixed portion and a second rotatable portion collectively forming the cavity, wherein the first fixed portion forms an opening of the cavity configured for fluidic communication with the second opening of the passageway, wherein the first fixed portion has an axis arranged to be oriented coaxially with the axis of the tubular body, wherein the second rotatable portion locates the drain port which is disposed at a radially spaced location from the axis of the first fixed portion, and wherein the second rotatable portion is rotatably supported on the first fixed portion for rotation around the axis thereof to reposition the drain port angularly of the axis of the first fixed portion. 11. The fluid retention apparatus of claim 10, in combination with the positive displacement pump, wherein, when the positive displacement pump includes a pump housing receiving the prime mover and a mounting member for supporting the fluidic interconnection device in fixed relation to the piston and configured for attaching to the pump housing, and when the mounting member further forms a tubular wall encompassing the leak containment device, the mounting member includes an opening in the tubular wall for accessing the drain port. 12. A fluid retention apparatus for a positive displacement pump, wherein the positive displacement pump has: a piston extending along an axis between opposite ends thereof; a prime mover operatively connected to the piston and configured to displace the piston in reciprocating linear movement along the axis of the piston; a fluidic interconnection device configured to fluidically interconnect a supply having a fluid to be pumped, a target for receiving the fluid and the piston to effect the transfer from the supply to the target, wherein the fluidic interconnection device includes a housing, an inlet port supported by the housing and configured for fluidic communication with the supply, an outlet port supported by the housing and configured for fluidic communication with the target, wherein the fluidic interconnection device is configured to provide a flow of the fluid through the housing from the inlet port to the outlet port; wherein the fluidic interconnection device further includes a transfer chamber in the housing intermediate the inlet and outlet ports relative to the flow of the fluid through the housing for receiving the piston in the reciprocating linear movement thereof, whereby the piston acts a plunger to transfer the fluid from the supply to the target; wherein the fluidic interconnection device further includes a packing chamber adjacent the transfer chamber and remote to the flow of the fluid for receiving a sealing body to fluidically seal the transfer chamber at an interface with the piston, wherein the piston passes through the packing chamber and into the transfer chamber to provide an end portion of the piston defining a terminal end thereof, distal to the prime mover, for movement within the transfer chamber; wherein the sealing body is configured for insertion into the packing chamber and forming a passageway configured to sealably receive the piston therethrough; the fluid retention apparatus comprising: a housing arranged to be adjacent the sealing body and in opposite relation to the transfer chamber; a cavity in the housing configured to receive the piston therethrough and for fluidic communication with the passageway of the sealing body and to receive the fluid that has leaked into the passageway from the transfer chamber, wherein the cavity extends along an axis from an open end arranged in fluidic communication with the passageway of the sealing body and a substantially closed end forming a substantially sealed interface with the piston; and a drain port in fluidic communication with the cavity and configured for selectively communicating the cavity with an external vessel for receiving the fluid that has leaked. 13. The fluid retention apparatus of claim 12 wherein the drain port forms a passageway in communication with the cavity and extending transversely relative to the axis of the housing arranged to be coaxial with the axis of the sealing body. 14. The fluid retention apparatus of claim 12 or 13 wherein the housing comprises a first fixed portion and a second rotatable portion collectively forming the cavity, wherein the first fixed portion defines the open end and the second rotatable portion locates the drain port which is disposed at a radially spaced location from the axis of the housing, and wherein the second rotatable portion is rotatably supported on the first fixed portion for rotation around the axis of the fixed portion to reposition the drain port angularly thereof. 15. The fluid retention apparatus of any one of claims 12 to 14, in combination with the positive displacement pump, wherein, when the positive displacement pump includes a pump housing receiving the prime mover and a mounting member for supporting the fluidic interconnection device in fixed relation to the piston and configured for attaching to the pump housing, and when the mounting member further forms a tubular wall encompassing the leak containment device, the mounting member includes an opening in the tubular wall for accessing the drain port. 16. A method for containing fluid during transfer from a supply to a target using a positive displacement pump, wherein the positive displacement pump has a plunger and a transfer chamber disposed intermediate the supply and the target relative to a flow of the fluid therebetween, and wherein the plunger is received in the transfer chamber and movable relative thereto in reciprocating movement to draw the fluid into the transfer chamber and discharge the fluid therefrom, the method com prising: resisting, using a sealing device received coaxially of the plunger outside the transfer chamber, leakage of the fluid out of the transfer chamber, wherein the sealing device has a passageway through which the plunger is passed and which is in frictional circumferential engagement with an outer surface of the plunger to form a seal therearound; and guiding, using a fluid-conveying component in fluidic communication with the passageway of the sealing device and remote to the transfer chamber, a leaked portion of the fluid to an external vessel to be contained therein. 17. The method of claim 16 wherein the external vessel is the supply such that the leaked portion of the fluid is reintroduced for subsequent transfer to the target.