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Low Pressure Cryopump Components

A low-temperature pump and low-pressure technology, applied to pump components, variable displacement pump components, pumps, etc., can solve the problems of increasing costs and increasing component costs

Active Publication Date: 2018-10-16
WESTPORT FUEL SYST CANADA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To achieve a more precise construction with reduced dead volume, many solutions for manufacturing high pressure cryopumps employ components fabricated to tight manufacturing tolerances, which increases the cost of fabrication, and components are designed to allow adjustments during manufacturing , which increases the cost of the component

Method used

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  • Low Pressure Cryopump Components
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  • Low Pressure Cryopump Components

Examples

Experimental program
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Embodiment Construction

[0017] Figure 1 to Figure 3 The low pressure cryopump shown in the preferred embodiment shown in is a reciprocating piston pump assembly that manipulates fluid at low pressure, which is defined in this disclosure to mean displacing fluid to about 100 psi to 300 psi pressure and can be designed to allow up to about 600 psi maximum discharge pressure pump. Embodiments of the low pressure cryopump described in this disclosure are made to deliver fuel such as LNG from a fuel tank to a natural gas fueled internal combustion engine, however, such pumps can be used in other applications suitable for low pressure pumps And it is especially suitable for cryopumps that pump fluids to low pressures.

[0018] see now figure 1 and figure 2 , the subject low-pressure cryopump is shown in perspective and cross-sectional views, respectively. The pump assembly 100 includes a reciprocating pump 110 connected to a drive 112 by an extension tube 114 . Because the fluid pumped by the pump i...

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PUM

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Abstract

A low pressure cryogenic pump assembly has components that define the dimensions of the pump's swept volume and dead volume which are made with manufacturing tolerances, that collectively, when compounded with each other, result in a dead volume of no more than 20% of the swept volume. The pump assembly comprises a pump piston that is reciprocable in a pumping chamber between a fully retracted position and a fully extended position to define a swept volume. The dead volume is defined by fluid volume remaining inside the pumping chamber when said pump piston is in its fully extended position.

Description

technical field [0001] The present disclosure relates to a low pressure cryogenic pump assembly, and more particularly, to a reciprocating piston pump for pumping liquefied gas. Background technique [0002] Reciprocating piston pumps are used to deliver pressurized fluids in a variety of applications. For example, reciprocating piston pumps are being used in automotive applications to deliver fuels such as liquefied natural gas (LNG) to internal combustion engines. [0003] In known automotive gaseous fuel systems, a reciprocating piston pump for the engine has been developed by the applicant, which injects fuel directly into the combustion chamber either late in the compression stroke or early in the power stroke. For this type of direct fuel injection, fuel must be delivered at high pressure in order to overcome the internal cylinder pressure and allow the required amount of fuel to be injected for a limited amount of time. Such high pressure systems deliver fuel to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B15/00F04B53/00
CPCF04B37/08
Inventor R·A·萨恩斯任子元
Owner WESTPORT FUEL SYST CANADA INC