中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

294 records (took 0.013 seconds)

    Method for producing corrugated tubes having multiple walls
    21.
    发明授权
    Method for producing corrugated tubes having multiple walls 失效
    用于生产具有多个壁的腐蚀管的方法

    公开(公告)号：US3584367A

    公开(公告)日：1971-06-15

    申请号：US3584367D

    申请日：1969-08-13

    Applicant: DANFOSS AS

    Inventor： KIERSGAARD JORGEN

    IPC: B21C37/20 ,  B21D22/20 ,  B23P17/00 ,  B23P19/04

    CPC classification number: B21D22/203 ,  B21C37/205 ,  Y10T29/49805 ,  Y10T29/49877 ,  Y10T29/49927 ,  Y10T29/4994

    Abstract: THE INVENTION RELATES TO A METHOD FOR PRODUCING CORRUGATED TUBES HAVING MULTIPLE WALLS WHICH MAY BE USED AS BELLOWS AND HAVE OTHER USES. STARTING WITH TWO THIN PLATES, A TEMPERATURE RESISTANT PROTECTIVE COATING OF A MATERIAL SUCH AS TITANIUM IS APPLIED TO AT LEAST ONE PLATE AND THE PLATES ARE SUPERIMPOSED WITH THE COATING BEING BETWEEN THE PLATES. THE PLATES ARE SUBJECTED TO A DEEP DRAWING OPERATION TO FORM A DOUBLE WALLED CUP SHAPED MEMBER WHICH IS SUBSEQUENTLY SUBJECTED TO A CORRUGATING OPERATION. THE TEMPERATURE-RESISTANT COATING PREVENTS THE WELDING TOGETHER OF THE TWO PLATES DURING THE DRAWING OPERATION SO THAT ENGAGING PORTIONS OF THE PLATES ARE RELATIVELY DISPLACEABLE DURING THE CORRUGATING OPERATION. THIS MOBILITY OR RELATIVE DISPLACEABILITY OF THE PLATES PREVENTS STRESSES FROM FORMING WHICH WOULD OTHERWISE CAUSE UNDESIRED DISTORTIONS OF THE METAL DURING THE CORRUGATING OPERATION.

    Three-phase inverter
    22.
    发明授权
    Three-phase inverter 失效
    三相逆变器

    公开(公告)号：US3573602A

    公开(公告)日：1971-04-06

    申请号：US3573602D

    申请日：1969-06-16

    Applicant: DANFOSS AS

    Inventor： JENSEN ARNE

    IPC: H02M7/06 ,  H02M7/48 ,  H02M7/49 ,  H02M1/12

    CPC classification number: H02M7/49 ,  H02M7/068

    Abstract: The invention relates to a three-phase inverter producing a stepped voltage between each two output terminals which approximates the sinusoidal form. The apparatus includes two three-phase inverter systems of the type comprising pairs of parallel arranged controllable rectifiers and three transformers each having a primary winding and two secondary windings.

    Magnetic circuit opening and closing motor starting switch in response to heat varying macnetic permeance
    23.
    发明授权
    Magnetic circuit opening and closing motor starting switch in response to heat varying macnetic permeance 失效
    磁性电路开启和关闭电机起动开关响应加热变化的机械性能

    公开(公告)号：US3566225A

    公开(公告)日：1971-02-23

    申请号：US3566225D

    申请日：1968-09-26

    Applicant: DANFOSS AS

    Inventor： POULSEN ERIK KURT

    IPC: H02K17/30 ,  H02P1/42 ,  H02K17/08

    CPC classification number: H02P1/42 ,  H02K17/30

    Abstract: A synchronous motor and a starting circuit therefore in which a switch in series with the motor winding determines the starting period during which the starting winding is electrically energized. The switch has a leaf-spring movable contact tending toward opening the starting circuit kept in a circuit-closing position by a magnetic system which has a ferromagnetic member therein rendered nonmagnetic by heat applied by a PTC-resistor in series with the motor starting winding so that the ferromagnetic member releases a magnet on the movable contact closing the switch and the motor starting period is thus determined.

    Proportional controller with nonlinear proportional band width control
    30.
    发明授权
    Proportional controller with nonlinear proportional band width control 失效
    具有非线性比例带宽控制的比例控制器

    公开(公告)号：US3510738A

    公开(公告)日：1970-05-05

    申请号：US3510738D

    申请日：1966-07-05

    Applicant: DANFOSS AS

    Inventor： IVERSEN KRISTIAN

    IPC: G05B5/01 ,  G05D23/24

    CPC classification number: G05B5/01 ,  G05D23/1906 ,  G05D23/1927 ,  G05D23/24

    Abstract: 1,111,747. Electric control systems. DANFOSS A/S. July 13, 1966 [July 13, 1965], No. 31510/66. Heading G1N. A bridge circuit 1, having a temperature sensitive resistor 4 and an adjustable resistance 5 in one branch, and resistors 6, 8 linked by a potentiometer 7 in the other branch, is rebalanced by a motor 17 which drives the pointer 9 of potentiometer 7 and also a controlled member such as a valve (not shown), the potentiometer 7 being shunted by a manually variable resistor 10 and by a variable impedance circuit including a transistor 20, whereby the range of control of the bridge is continuously and automatically variable. The output of the bridge from points 9, 11 is amplified at 12 and according to its polarity operates a relay 13 or a relay 14 to drive the single phase A. C. motor 17 in one or other direction. When initial bridge rebalance is achieved, both contacts 15, 16 of the relays 13, 14 are unoperated, and supply A. C. energization from 18 to a heater 22 associated with a negative temperature coefficient resistor 21 in the base circuit of the transistor 20. Consequently the net shunt resistance across the potentiometer 7 is reduced and increases the range of control of the bridge and the motor is re-operated to effect a finer adjustment of bridge balance. The sequence of operation continues until the bridge is finally balanced, with the only error remaining being the threshold voltage of the relays. The apparatus is intended to avoid overshoot without using integral feedback or the like.

Patent Agency Ranking