Concentrating evaporators – Film type – Centrifugal
Patent
1986-10-08
1988-08-16
Lacey, David L.
Concentrating evaporators
Film type
Centrifugal
159DIG16, 159DIG41, 202205, 202238, 202266, 203 1, 203 91, 203DIG18, B01D 310, B01D 342
Patent
active
047642505
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a vacuum evaporator which is supported with vertical adjustability on a base plate or pedestal by means of a holding device.
It is known that in many instances, vacuum evaporators are mounted above the water bath serving as the heat source with the help of stands. The vacuum evaporator can be vertically adjusted on such stands by manual manipulation. However, it has been found that the change in height so accomplished requires a great deal of work, and that such changes cannot be automated. Furthermore, methods are known by which vacuum evaporators are supported by a threaded spindle, in particular by a motor-driven threaded spindle which is guided in a straight line, and vertically adjusted by rotating the threaded spindle. However, such threaded spindle cannot support vacuum evaporators in any stable manner.
The objective of the invention is to make provision for measures for mounting vacuum evaporators in a stable manner that permits height adjustments and automation.
According to the invention, this objective is accomplished in that the vacuum evaporator is fixed on a supporting sleeve which is vertically guided on a bolt rigidly connected with the pedestal being supported by the free end of a lever arm pivoted on the pedestal. The lever arm swings in the vertical plane between two end positions with the help of a motor-driven threaded shaft which is tilt-mounted on the pedestal and rotating in a threaded sleeve that is connected with the lever arm. By means of such supporting sleeve, a stable and steady support of the vacuum evaporator is achieved on all levels and the lever arm permits exactly defined adjustments. If need be, the adjustment motions performed by means of the lever arm may be derived from a parameter such as, for example, the vacuum. Furthermore, the mounting support for the vacuum evaporator can be automated and the articulated connection between the lever arm and pedestal formed by a lashing pivoted on such lever arm and pedestal keeps the supporting sleeve and vacuum evaporator free from interfering transverse forces.
According to a preferred embodiment, the driven shaft of a geared motor is used as the threaded shaft, such geared motor being tilt-mounted on the pedestal.
For the purpose of actuating the lever arm independently of the drive, for example for lifting the evaporator piston from the water bath in the event of a power failure, provision is made for the threaded sleeve to be surrounded by and freely displaceable in a coupling sleeve that is rigidly connected with the lever arm, and that these two sleeves can be connected or separated by means of a set screw guided in the coupling sleeve. When the coupling sleeve and the threaded sleeve are firmly connected, the lever arm follows the motions of the threaded shaft, whereas when the set screw is loosened, the coupling sleeve with the lever arm can perform motions relative to the threaded sleeve. Furthermore, the coupling sleeve is provided with a transversely displaceable pin, which, in the ON-position, closes an electric switching element in the current circuit of the geared motor, and opens it when the coupling sleeve is in the OFF-position.
It has been found that it is particularly advantageous if a damping spring is arranged between the lever arm and pedestal. Apart from affording weight relief, such damping spring, when the coupling sleeve and the threaded sleeve are separated, affords the advantage that that the lift-off motions of the lever arm can be effected automatically under the influence of the initial tension of the damping spring.
Finally, for the purpose of securing the motions of the lever arm, provision is made that the top and bottom end positions are fixed by limit switches projecting into the path of swivel of the lever arm and disposed in the current circuit of the geared motor.
Furthermore, in devices in which power cables for the driving motor of the evaporator piston are installed in the supporting sleeve, the vacuum evaporator may be supported by a geared motor being detacha
REFERENCES:
patent: 2575688 (1951-11-01), Smith
patent: 2695871 (1954-11-01), Shavel, Jr. et al.
patent: 3219099 (1965-11-01), Hamlow et al.
patent: 3342696 (1967-09-01), Bush
patent: 4390500 (1983-06-01), Miskinis
patent: 4569724 (1986-02-01), Firestone
patent: 4622102 (1986-11-01), Diebel
Lapedes, "McGraw Hill Dictionary of Scientific and Technical Terms," 2nd ed. p. 106.
Riehl Gunther
Vollgold Gunther
Lacey David L.
Manoharan V.
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