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1. 发明专利

JPS5712168A SHAFT SEALING DEVICE 失效
公开(公告)号：JPS5712168A
公开(公告)日：1982-01-22
申请号：JP8510480
申请日：1980-06-25
申请人： HITACHI LTD
发明人： MIZUMOTO MUNEO , MISUMI YOUJI
IPC分类号： F16J15/44
摘要： PURPOSE:To prevent leakage of the fluid from a shaft sealing device of sliced sleeve type likely to arise when the shaft in this sleeve rotates at a low speed or remains at a standstill by supporting at least one of those slices, provided with a groove femalethreaded, in such a way that it can rotate freely along the circumferential direction. CONSTITUTION:When the number of revolutions of the shaft 1, N, drops to attain the preset value N0, a comparator 17 gives a motor drive signal to a motor 15, which will actuate a sleeve 3b into rotation with the aid of a gear 14 and a sector gear 12. This rotation of sleeve 3b is transmitted to another sleeve 3d through a pin shaft 7, and the sleeve 3d turns for the same angle as the sleeve 3b. By this rotation of sleeves 3b, 3d, the groove part 4b of screw groove 4 provided in the inside surface of each sleeve 3a-3d is blocked by the top 4a. Consequently, the fluid can be prevented from leakage through following the screw groove 4.

2. 发明专利

JPS57168096A FEED-WATER PUMP FOR ATOMIC REACTOR 失效
公开(公告)号：JPS57168096A
公开(公告)日：1982-10-16
申请号：JP5319681
申请日：1981-04-10
申请人： HITACHI LTD
发明人： HIROSHIMA MINORU , KOKUBO KUNIO , MISUMI YOUJI
IPC分类号： F04D7/08 , F04D29/42 , F04D29/44 , G21C15/24 , G21D1/04
摘要： PURPOSE:To recover pressure and improve the pump efficiency by providing a scroll so that its center is located eccentric to a casing axle, forming an inclination angle, and processing it so that the cross section varies continuously. CONSTITUTION:A scroll 90 is provided in a casing 1 so that its center is located eccentric to an axle of the forged casing 1, an inclination angle is formed under a special process, and it is processed so that the cross section varies continuously. The water sucked from a suction pipe 6 flows through a suction case 2 into an impeller 3 in which the kinetic energy is applied, then a part of the kinetic energy is converted into the pressure energy by a diffusor 4, and the water flows into the scroll 90. Since the scroll 90 is formed so that its cross section varies continuously, the kinetic energy is converted into the pressure energy, and the water is exhausted from an exhaust pipe 7 as a fluid with a sufficient pressure. Thereby, the pump efficiency can be remarkably improved.

3. 发明专利

JPS57129918A JOURNAL BEARING 失效
公开(公告)号：JPS57129918A
公开(公告)日：1982-08-12
申请号：JP1435281
申请日：1981-02-04
申请人： HITACHI LTD
发明人： YOSHIOKA MASAHIRO , KOIKE TOSHIFUMI , MISUMI YOUJI
IPC分类号： F16C17/02 , F16C33/10
摘要： PURPOSE:To improve the distribution of oil film pressure on a journal bearing provided with at least one oil supply groove extending in the axial direction and reduce self-sustained oscillation caused during rapid rotation, by placing one oil supply groove near the line of action of the load on the bearing. CONSTITUTION:A rotary shaft 3 is supported on the perfectly circular bearing surface 2 of the body 1 of a journal bearing. A pair of oil supply grooves 5a, 5b are provided on the bearing surface 2 so that the imaginary straight line extending from one oil supply groove to the other is oblique to the horizontal line extending on the axis of the bearing. One oil supply groove 5a is located at a phase lead angle of theta such as 45 deg. from the line of action of the load W on the bearing, with regard to the direction of rotation of the shaft 3. Acording to this constitution, the distribution of pressure of oil film made between the bearing surface 2 and the rotary shaft 3 has two peaks because no high pressure is caused in the oil supply groove 5a. As a result, the pressure of the oil film and the load carrying capacity of the bearing are lowered and the eccentricity ratio of the shaft 3 is increased so that its stability is heightened.

4. 发明专利

JPS603499A DOUBLE CYLINDER TYPE PUMP 失效
公开(公告)号：JPS603499A
公开(公告)日：1985-01-09
申请号：JP11089883
申请日：1983-06-22
申请人： HITACHI LTD
发明人： MISUMI YOUJI , KASAI KENICHI , SUGANO SATOSHI , HIRAI SHIYOUZOU
IPC分类号： F04D29/42
摘要： PURPOSE:To aim at miniaturizing a double cylinder type pump and as well at simplifying the water extraction of the intermediate stage of the pump, by forming at least one axial extracting passage in an inner casing with one side of the passage being connected to the discharge port of an intermediate stage impeller and the other side thereof being connected to a water extracting passage in an outer casing. CONSTITUTION:An one side water extracting passage 16a among water extracting passages 16a, 16b, 16c... formed in inner casing segments 11a, 11b, 11c... and the other side water extracting passage 16c are connected respectively to an water extracting passage 4a formed in an outer casing 3 and an axial water passage 9c comunicated with the discharge side of an intermediate stage impeller 7c which discharges water at a predetermined pressure. With this arrangement, the water extraction of the intermediate stage may be easily made, and as well it is not necessary to increase the inner diameter of the outer casing 3 in the intermediate stage water extracting section and to change the shape of the outer casing 3. Accordingly, the weight and size of the pump may be aimed at being reduced in its entirety.

5. 发明专利

JPS57154562A FLOATING SEAL 失效
公开(公告)号：JPS57154562A
公开(公告)日：1982-09-24
申请号：JP3531881
申请日：1981-03-13
申请人： HITACHI LTD
发明人： MISUMI YOUJI
IPC分类号： F16J15/44
摘要： PURPOSE:To give vibration damping effect to a seal ring, by providing a plurality of leaf springs on the outer circumference of the sealing. CONSTITUTION:Each of the leaf springs 6 fixed on the outer circumference of a seal ring 1 has a projection 6A that is kept and held in a groove 2A formed in a retainer 2 in order to keep its position during operation. As a result, vibration in the normal direction to the shaft axis can be damped while the seal ring 1 can operate in such a condition as not to touch a shaft sleeve 4 even when a rotation speed is low and passing water volume is small, possibly resulting in hardness of formation of water membrane in a small gap between the seal ring 1 and the shaft sleeve 4, because the ring 1 is set in such a condition as being floated by the leaf spring 6.

6. 发明专利

JPS53117158A FLOATING RING SEAL 失效
公开(公告)号：JPS53117158A
公开(公告)日：1978-10-13
申请号：JP3109377
申请日：1977-03-23
申请人： HITACHI LTD
发明人： MISUMI YOUJI , INOUE KOU
IPC分类号： F16J15/44 , F16J15/34
摘要： PURPOSE:To improve the compliance of seal ring by effective application of reaction of sealed fluid formed in the opening.

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