Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-12-12
1994-08-30
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 88, 174 77R, H02K 510, H02G 1502
Patent
active
053431030
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a power supplying unit which is used for supplying the power to such loads as a motor or so forth, and for driving a submerged pump being used in the case of scooping out of a tank the low temperature liquid like a liquified natural gas (LNG) that is stored inside the tank.
BACKGROUND OF THE INVENTION
Because the submerged pump is inserted into the bottom portion inside the casing which has been vertically lowered inside the tank, the power supplying unit against the motor for driving this pump is installed air-tightly, with use of a flange, to the bulkhead in the boundary area between the casing interior and the atmosphere. Therefore, the unit is subjected to the actions as follows.
a. The unit is subjected to the temperature influence close to the atmospheric temperature in the case that the pump is not put into operation.
b. When the power supply for running the pump is started the penetrating conductor for power supply initially heats up to around 80.degree. to 90.degree. C. When the scooping of low temperature liquid is commenced, the conductor is cooled down sharply by the influence of the low-temperature liquid or gas.
Since the penetrating conductor of power supplying unit is especially and repeatedly subjected to this type of heat influence, the conductor repeats the linear expansion and contraction at each of the occasions. There exists a possibility for breakages to the air-tightly connected area of penetrating conductor because of the stress being generated by this phenomenon. Therefore, in the conventional design, a ceramic sleeve 4 is passed through and fixed to the inside of mount hole 2 of flange 1 which is fitted to the bulkhead "d" of, and replace casing as shown in FIG. 5. Through the ceramic sleeve a penetrating conductor 5 is passed, wherein the ceramic sleeve 4 is air-tightly coupled to the penetrating conductor 5 by use of a silver solder 7 utilizing a metallic plate 6 on the inside of the flange 1 (casing interior). This is done with such a contrivance that no stress may act especially on the ceramic sleeve 4 and the silver solder 7 area having small tensile strengths by putting the outside of flange 1 from the inside of ceramic sleeve 4 under a free situation and by directing the linear expansion and contraction of penetrating conductor 5 toward the outside direction of flange 1.
However, in the event that the ceramic sleeve 4 has been air-tightly connected sealingly to the penetrating conductor 5 only at one location inside the flange in this way, the low temperature liquid or gas may promptly leak out of the inside of casing, resulting in a dangerous situation if any breakage should happen to this sealed area and the airtightness should be damaged.
SUMMARY AND OBJECTS OF THE INVENTION
The present invention in this patent application is proposed for solving the defects of aforementioned conventional art, the first of its objects is to provide the sealingly connected portions between the ceramic sleeve and the penetrating conductor at two locations, inside and outside of the flange, for making the outside seal function and for preventing any leakage even if the sealing property should be lost in the inside sealingly connected portion.
Further, the 2nd of its objects is to provide such a contrivance as preventing the tensile stress influence from being exerted onto the ceramic sleeve side which is especially weak in tensile strength. If the ceramic sleeve should be sealingly connected to the penetrating conductor at two locations inside and outside the flange as described in the 1st object, there may appear a difference in the heat expansion/contraction between the ceramic sleeve side extremely least in heat expansion/contraction percentage and the penetrating conductor side large in the percentage to the contrary and thereby the stress is concentrated onto the sealingly connected portions of both the components, not only increasing the metallic fatigue in the relevant sealingly connected portions but also causing the te
REFERENCES:
patent: 4434320 (1984-02-01), Klein et al.
patent: 4500263 (1985-02-01), Mohn
patent: 4549105 (1985-10-01), Yamamoto et al.
patent: 5149984 (1992-09-01), Schultz et al.
Aizawa Ikuo
Aoki Nobuo
Negishi Hideo
Yokoi Keisuke
Furukawa Electric Co. Ltd.
Nguyen Matthew
Stephan Steven L.
Tokyo Gas Co. Ltd.
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