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Cryogenic pump

A technology of cryogenic pumps and cryogenic liquids, applied in pumps, pump components, variable displacement pump components, etc., can solve problems such as pump damage and hindering the actual pumping of cryogenic liquids

Active Publication Date: 2014-10-15
CRYOSTAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many practical problems arise when pumping cryogenic liquids, especially liquid hydrogen and liquid helium
A particular problem is the tendency of cryogenic liquids to vaporize due to absorbing heat from the environment due to cavitation within the pump
Cavitation can cause damage to the pump itself and can also hinder the actual pumping of cryogenic liquid from the tank

Method used

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  • Cryogenic pump
  • Cryogenic pump
  • Cryogenic pump

Examples

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Embodiment Construction

[0016] Reference attached figure 1 , the cryogenic reciprocating pump 2 is substantially cylindrical in configuration. The pump 2 is shown positioned at a slight angle to horizontal, but may have any orientation. The pump has a warm end 4 and a cold end (or head) 6. At the warm end 4 of the pump 2 there is a mechanism (not shown) for driving a piston inside said pump 2 . Typically, electric drives are employed, but hydraulic, pneumatic or mechanical drives may alternatively be used. The arrangement used to drive the pump is conventional and needs no further description herein.

[0017] At the cold end (head) 6 of the pump 2, a first sheath 8 (see figure 2 and image 3 ) and a second sheath 10 surrounding the distal end of the first sheath 8 . The second jacket 10 defines a chamber for receiving a coolant fluid, typically liquid nitrogen. The second sheath 10 has a proximal end disposed at the first flange 12 . The second sheath 10 is generally formed from two adjacent...

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Abstract

A reciprocating cryogenic pump (2) comprises a piston reciprocable within a pumping chamber (44). The pumping chamber (44) has an inlet suction valve (48) for cryogenic liquid to be pumped and an outlet (32) for high pressure cryogenic liquid. The inlet valve (48) for the cryogenic liquid communicates with a cryogenic liquid reception chamber (46) in the cold end or head (6) of the pump (2). The pump head (6) is at least partially surrounded by a first jacket (8) retaining primary vacuum insulation. The first jacket (8) is itself at least partly surrounded by a second jacket (10). The jacket (10) defines a chamber for the reception of a coolant fluid such as liquid nitrogen and the second jacket has an inlet (20) and an outlet (22) for the liquid nitrogen. The thermal insulation can be further enhanced by a trapped gas space (73) between the first jacket (8) and an inner sleeve (52), the latter defining with an outer sleeve (50) vacuum insulation for the pumping chamber (44).

Description

technical field [0001] The present invention relates to a cryopump and in particular to a cryogenic reciprocating pump. Background technique [0002] Cryopumps are well known and are becoming increasingly used in industry. In one example, motor vehicles now use hydrogen as fuel. Some of these vehicles are adapted to store liquid hydrogen. There is therefore a need for liquid hydrogen filling stations similar to conventional gas stations. Such filling stations need to be equipped with cryopumps capable of generating high pressures up to, for example, seven hundred bar gauge in order to transfer liquid hydrogen from the central storage to the storage tank of each motor vehicle being filled. However, many practical problems arise when pumping cryogenic liquids, especially liquid hydrogen and liquid helium. A particular problem is the tendency of cryogenic liquids to vaporize due to absorbing heat from the environment due to cavitation within the pump. Cavitation may cause ...

Claims

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Application Information

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IPC IPC(8): F04B15/08F04B37/08
CPCY10T137/794F04B53/20F04B37/08F04B15/08F17C2227/0142F04B53/08F04B2015/0824F17C9/00F04B37/10Y02E60/32F17C2227/015F04B2015/0822
Inventor P.帕皮雷尔S.斯甘巴蒂
Owner CRYOSTAR
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