摘要:
An ultrasound diagnosing device in which resolving power becomes uniform in a direction orthogonal to a scanning direction of sound rays over a wide range from the shallow to the deep. Ultrasound signals are transmitted and received by changing combination of the arrays associated with transmission and/or receiving of the ultrasound waves depending on a depth of an object for observation by using an ultrasound probe incorporating a plurality of unidimensional arrays of a plurality of ultrasound oscillators arranged in parallel and an acoustic lens having intrinsic focal points for every array on the side of an ultrasound radiation face of these arrays.
摘要:
A solenoid valve includes a linear solenoid and a ring-shaped rubber packing. The solenoid includes a yoke, an outer connector, a volume changing chamber, and a breathing passage. The yoke is made of a magnetic material and formed in a generally cylindrical cup shape having a cup-bottom part and a cup-opening part. The cup-opening part includes a notch. The connector is made of resin and exposed from the notch to an outside of the yoke. Volume of the chamber is changed in accordance with operation of the solenoid. The passage is formed inside the solenoid, and communicates with the chamber. The passage includes an outer opening, which opens into the outside of the yoke and is located at a fitted part between the yoke and the connector. The packing is attached around a base of the connector, where the yoke and the connector are fitted together.
摘要:
In an electromagnetic hydraulic control valve for driving a spool type valve by means of an electromagnetic actuator, the electromagnetic actuator has a plunger and a core stator which slide on each other. Therefore their magnetic efficiency along their radial directions gets better and magnetic radial force generated at the plunger is suppressed to a constant level. Thus, increase of hysteresis in a high stroke range can be suppressed. In addition, magnetic radial force along the radial direction is stably generated even in a low stroke range, because of magnetic efficiency. This suppresses vibration of the plunger, and therefore an orifice used conventionally can be disused. By disusing the orifice, the influence of the viscosity of oil is reduced and a response of the spool at low temperature can be improved.
摘要:
Non-magnetic layers are formed on an inner circumferential wall of a housing portion 13 and an outer circumferential wall of a plunger 17, respectively. Assuming that the thickness of the non-magnetic layer of the housing portion is t0, the thickness of the non-magnetic layer of the plunger is t1, a magnetic gap formed in a radial direction between respective magnetic materials of the housing portion and the plunger which excludes the non-magnetic layers is d0, and an air gap formed in a radial direction between the non-magnetic layers when the plunger does not deviate from but remains coaxial with the housing portion is d1, the thickness are set so as to satisfy 40 &mgr;m≦t0+t1≦80 &mgr;m, d0≈100 &mgr;m. In addition, it is set such that the attracting portion becomes saturated magnetically when the value of electric current that is supplied to a coil increases to reach a predetermined value which falls between 40% or larger and 60% of smaller of a maximum value of the electric current.
摘要:
Since an output port is formed at a front end portion of a sleeve, an electromagnetic valve is arranged in series with a control valve. Thus, a system becomes small, and it becomes easy to attain a mounting space. Further, since a feedback chamber is formed in the vicinity of the linear solenoid, it is possible to install a spool after the sleeve is attached to the linear solenoid. Thus, unidirectional assembling becomes possible, and the number of assembling steps is decreased. Furthermore, since a small-diameter land is provided in the spool at a side of the linear solenoid, a small-diameter inner wall for slidably guiding the small-diameter land is concentrated to one place at the side of the linear solenoid. Thus, forming a small-diameter hole in the sleeve becomes easy, and forming accuracy is improved.
摘要:
A plunger is axially intersectable with a tubular recessed portion formed in a magnetically attracting core of a stator core upon slide movement of the plunger, which places a predetermined portion of the plunger into the tubular recessed portion. A magnetic material in the predetermined portion of the plunger may have a predetermined outer diameter that is smaller than an outer diameter of the magnetic material in a slidably contacting portion of the plunger, which slidably contacts a slidable core of the stator core. Alternatively, a magnetic material in the tubular recessed portion may have a predetermined inner diameter that is larger than an inner diameter of the magnetic material in a slidably contacting portion of the slidable core, which slidably contacts the plunger.
摘要:
A solenoid includes a stator core, a plunger, a ring core, and a magnetic circuit component. The stator core has a fixed axial end and a free axial end. The free axial end is unfixed. The stator core is formed of a magnetic material. The plunger is slidable along an inner surface of the stator core. The plunger is formed of a magnetic material. The ring core surrounds an outer surface of the free axial end of the stator core. The ring core is formed of a magnetic material. The magnetic circuit component is adjacent to the stator core. The magnetic circuit component conducts magnetic flux with the stator core. The ring core radially conducts radial magnetic flux with the stator core. The ring core axially conducts axial magnetic flux with the magnetic circuit component.
摘要:
A vibration type density meter includes a mechanical oscillator or resonator having a resonance frequency variable with the density of a specimen fluid around the oscillator. The resonator is of a cylindrical configuration with flanges at the ends thereof, at least one of the ends being open for introducing specimen fluid into the resonator. The meter also includes means for exciting the resonator, means for detecting oscillations of the cylindrical resonator, a cover coupled to the flanges of the resonator in surrounding relation to the latter, and circuit means for processing a frequency signal from the oscillation detecting means, and by arithmetic operations derive and display the density of the specimen fluid being measured.
摘要:
A vibration type transducer is provided in which various physical quantities, for example, the pressure, density, force and temperature are measured from the natural frequencies of the mechanically vibrated vibrator.The vibrating element is vibrated in a plurality of vibration modes and a plurality of resultant frequency signals are processed to obtain signals associated with the various physical quantities. The system is not influenced by physical quantity other than the physical quantity to be measured.
摘要:
A solenoid includes a stator core, a plunger, a ring core, and a magnetic circuit component. The stator core has a fixed axial end and a free axial end. The free axial end is unfixed. The stator core is formed of a magnetic material. The plunger is slidable along an inner surface of the stator core. The plunger is formed of a magnetic material. The ring core surrounds an outer surface of the free axial end of the stator core. The ring core is formed of a magnetic material. The magnetic circuit component is adjacent to the stator core. The magnetic circuit component conducts magnetic flux with the stator core. The ring core radially conducts radial magnetic flux with the stator core. The ring core axially conducts axial magnetic flux with the magnetic circuit component.