Cryogenic pump with an essentially cup-shaped housing

Details Cryogenic pump with an essentially cup-shaped housing Cryogenic pump with an essentially cup-shaped housing

1994-07-25

1996-08-06

Capossela, Ronald C.

Refrigeration

Low pressure cold trap process and apparatus

417901, B01D 800

Patent

active

055422578

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a cryogenic pump with an essentially cup-shaped housing, with a radiation screen disposed in the housing and also essentially cup-shaped, with an inlet opening, with a cold head extending into the housing and the radiation screen, with pump surfaces for condensable gases, disposed on the cold head, with a collecting chamber for liquid condensate developing during regeneration of the pump and with an outlet pipe, which is used for removal of the gases which have settled on the pump surfaces during regeneration and the inlet opening of which is in the region of the collecting chamber.
2. Description of the Related Art
It had already been proposed in connection with a cryogenic pump of this type to achieve the regeneration of the pump surfaces --preferably the pump surfaces of the second stage of a two-stage cryogenic pump--in that the temperature of the pump surface to be regenerated and the pressure in the pump are raised to values above the triple point of the gases to be removed and that the condensates being removed from the pump surface are removed--in liquid and/or gas form--via the outlet pipe. The preferably liquid condensate being generated during the regeneration of the pump collects in the bottom region of the vertically attached pump and flows off to the outside through the outlet pipe, the inlet opening of which is located in the bottom region of the radiation screen. "Vertical attachment" is intended to mean that the axis of the pump which is essentially designed cup-shaped is essentially vertically disposed.
There is an increasing necessity to attach cryogenic pumps of the type described horizontally, i.e. they must be connected with a recipient in such a way that the axis of the pump housing extends horizontally. If the above described regeneration process is performed on a pump disposed in this manner, the liquid condensate no longer collects in the region of the inlet opening of the outlet pipe. A rapid removal of the condensate via the outlet pipe is therefore no longer possible, so that it becomes necessary to forego the advantage of the particularly short regeneration time of the described regenerating process. Because no clearly defined "lowest point" is present, only slowly evaporating condensate pools are formed. If this occurs in the region of the inlet flange, there is the danger of damage to the O-rings usually employed because of the cold acting on them, which results in leaks.
It is the object of the present invention to design a cryogenic pump with the characteristics of the preamble of claim 1 in such a way that the described disadvantages are no longer present.


SUMMARY OF THE INVENTION

In accordance with the invention this object is attained in that the condensate collection chamber is laterally disposed in such a way that the pump can be regenerated even if horizontally attached and without having to accept the disadvantages of long regenerating times and/or the danger of damage to the seals. Because there always is a defined "lowest point", to which the outlet pipe is connected, the pump in accordance with the invention has the same advantages, also in respect to its regeneration properties, as the already proposed pump with vertical attachment.


BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages and details of the invention are to be explained by means of exemplary embodiments illustrated in FIGS. 1 to 5.
FIGS. 1 and 2 show, respectively, an elevational side view and a cross-sectional side view of one embodiment according to the invention;
FIG. 3 shows a cross-sectional side view of another embodiment according to the invention; and
FIGS. 4 and 5 show, respectively, an elevational side view and a cross-sectional side view of yet another embodiment according to the invention.


DESCRIPTION OF THE PREFERRED EMBODIMENTS

In all drawing figures, the cryogenic pump is identified by 1, its exterior housing by 2, the cold head by 3 and the radiation screen by 4. The housing 2 and the radiation s

REFERENCES:
patent: 3140820 (1964-07-01), Clausing
patent: 3788096 (1974-01-01), Brilloit
patent: 4719938 (1988-01-01), Pandorf

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