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Method of operating a cryopump and cryopump system

A cryogenic pump and cryogenic technology, applied in the field of pump systems, can solve the problem of limited power supply options for cryopump systems

Inactive Publication Date: 2019-05-28
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, in mobile applications, the available options for powering the cryopump system are limited, and the cryopump system is only one of many subsystems of the mobile machine competing for the limited power supply

Method used

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  • Method of operating a cryopump and cryopump system
  • Method of operating a cryopump and cryopump system
  • Method of operating a cryopump and cryopump system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0110] refer to Figure 10 , showing different actuator / spool strategies that achieve the same drive piston motion. The examples illustrate that using a method of operating a cryopump according to the principles of the present invention can reduce the power draw per pumping event by half or more relative to a reference strategy.

[0111] Strategy 1 mirrors the reference strategy in which hydraulically piloted actuators are activated to move the spool valve to the reference fill position (approximately 3.5mm) and remain in position for the entire reference time period (approximately 30ms) middle. The actuation event is a combination of the start phase and the hold phase of the armature of the hydraulic pilot actuator, each with a different power requirement. The power calculation for strategy 1 is as follows:

[0112] Starting power=4.4V×3A=13.2V·A

[0113] Startup duration = 0.5ms

[0114] Holding power = V×A=V·A

[0115] Hold duration (pump stroke): 29.5ms

[0116] Pow...

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Abstract

The cryopump system (100) includes a liquefied natural gas supply source (151), a hydraulic fluid source (152), a cryopump (155), and an electronic control module (150). A cryopump (155) is operatively arranged in communication with a supply of liquefied natural gas (151) and a source of hydraulic fluid (152). The cryopump (155) is configured to operate with the hydraulic fluid source (152) to compress at least a portion of the liquefied natural gas supply (151) for delivery to the engine (80). The electronic control module (150) is operatively arranged in connection with the cryopump (155) and configured to selectively operate the cryopump (155). A control strategy for operating a cryopump system (100) with low power requirements is disclosed.

Description

technical field [0001] The present invention relates generally to pump systems, and more particularly to cryopump systems and methods of operating the same. Background technique [0002] The use of alternative fuels to power machines used in agricultural, construction and mining operations has become increasingly common. The use of liquefied natural gas (LNG) to power mobile machines is becoming more common. LNG engines are considered more environmentally friendly than conventional diesel engines and other gasoline-powered internal combustion engines due to, among other things, lower carbon output. In addition, given the ubiquity of LNG, the costs associated with this type of fuel are generally lower than other fuel products, therefore, consumer demand for such machines is increasing. [0003] To provide natural gas to the engine in a portable and efficient manner, the natural gas is cooled to a liquid state and stored in a cryogenic tank on the machine. Such tanks typica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B9/107F04B15/08F04B23/02F04B23/06F04B49/06F04B49/22F04B53/10F04B53/14F04B53/16
CPCF04B9/107F04B15/08F04B23/02F04B23/06F04B49/06F04B49/22F04B53/10F04B53/14F04B53/16F04B2015/081Y10S417/901F04B37/08
Inventor S·J·比恩C·A·布朗
Owner CATERPILLAR INC