公开(公告)号：JPS61244893A

公开(公告)日：1986-10-31

申请号：JP8686985

申请日：1985-04-22

Applicant: NAT AEROSPACE LAB

Inventor： KAMIJO KENJIRO

IPC: F04D29/04 ,  F04D29/046 ,  F04D29/58

Abstract: PURPOSE:To improve working efficiency in exchanging a filter by opening one end of a passage passing through a casing and a guide vane at the downcourse side part of a main impeller, while the other end thereof at a bearing, and providing a filter in said passage. CONSTITUTION:The passage of a pump casing 5 is opened at a part where a main impeller is positioned, and a passage 9 passing through the part of a bearing 6 is provided at a guide vane 2 so that both passages are connected with each other. A filter 7 is arranged in the passage 8, and thereby the part of high pressure fluid is purified by the filter 7 so as to be supplied to the bearing 6. With this arrangement, the passages are provided in the casing, and thereby the working, in comparison with the case that the passages are provided on the driving shaft, is simplified so that it is possible to facilitate the exchange of the filter.

公开(公告)号：JPS62692A

公开(公告)日：1987-01-06

申请号：JP13813285

申请日：1985-06-25

Applicant: NAT AEROSPACE LAB

Inventor： KAMIJO KENJIRO ,  YAMADA HITOSHI

IPC: F04D29/18

Abstract: PURPOSE:To enable suction of gas-liquid two-phase fluid by providing an inducer with a pressure boosting ability which is obtained by multiplying a coefficient by a difference between a necessary suction pressure for a main impeller to suck only liquid composition of sucked fluid and a necessary suction pressure for the inducer. CONSTITUTION:An inducer 3 is provided with a pressure boosting ability obtained by multiplying a coefficient 2 by a difference between a necessary suction pressure for a main impeller 4 to suck only liquid composition of sucked fluid and a necessary suction pressure for the inducer 3 and is designed so that the attack angle of the inducer 3 is zero when a void rate is 40%. Even if the volmetric flow rate of gas which flows into a pump 1 occupies 30-50% with respect to the entire inlet volumetric flow rate of the pump, pressure increasing ratio at the main impeller 4 may be varied hardly. The inducer- mounted centrifugal pump of this invention therefore sucks gas-liquid double- phase flow sufficiently for the purpose of pressure increase.

公开(公告)号：JPH05332300A

公开(公告)日：1993-12-14

申请号：JP6700791

申请日：1991-03-29

Applicant: NAT AEROSPACE LAB ,  NAT SPACE DEV AGENCY

Inventor： KAMIJO KENJIRO ,  HASHIMOTO RYOHEI ,  OTA TOYOHIKO

IPC: F04D29/44 ,  F04D29/66

Abstract: PURPOSE:To prevent vibration due to whirling cavitation to prolong service life of a high-speed pump by providing a diffuser with an internal diameter larger than that in an interval surrounding an impeller at the inlet of a casing which divides the flow path of the impeller. CONSTITUTION:An inducer device comprises an axial type impeller 23 and a casing 24 which divides the flow path of the impeller, and a diffuser 27 is provided at an inlet 25 of the casing. Namely, an internal diameter D1 in an interval 40 in the upstream from the, impeller 23 is made larger than a value of an internal diameter D2 in an interval 26 surrounding the impeller 23 to which a space S from an internal wall 41 in the interval 26 to the top 42 of the impeller 23 and a distance Ds in radial direction are added. Then, when the impeller 23 is rotated, liquid from a tank is pressure built up properly and fed in axial direction, and the amount of fluid increased by the diffuser 27 enters by the easing 24 in addition to the flow corresponding to the impeller 23 to suppress whirling cavitation. Thus vibration transmitted to a high-speed pump side can be prevented by this control effect.

公开(公告)号：JPS63302166A

公开(公告)日：1988-12-09

申请号：JP13791487

申请日：1987-06-01

Applicant: NAT AEROSPACE LAB

Inventor： NOSAKA MASATAKA ,  KAMIJO KENJIRO

IPC: F02K7/08 ,  F02K9/78 ,  F02K99/00

Abstract: PURPOSE:To increase the amount of a liquid having high liquid oxygen concentration and augment a driving force by separating liquid air into a liquid of high liquid oxygen concentration and another liquid of high liquid nitrogen concentration, and using the liquid of high liquid nitrogen as a cooling source for intake air after the decompression and temperature reduction thereof. CONSTITUTION:Liquid hydrogen 4 stored in a tank 1 installed on a flying body is pressurized and fed via a pump 2, and cools intake air 5 via an air condenser 3 and an air precooler 10. And then hydrogen 4 is supplied to an engine combustor 14. In the aforesaid constitution, liquid air 6 is separated into a liquid 8 of high liquid Oxygen concentration and another liquid 9 of high liquid nitrogen concentration via a separator 7. And the liquid 9 of high nitrogen concentration is decompressed by a throttle 18 and then an air partial condenser 20 in the upstream of the air condenser 3. According to the aforesaid system, the intake air 5 from an air duct 11 is cooled.