Fluid sprinkling – spraying – and diffusing – With means to vibrate or jiggle discharge – By electric transducer
Patent
1985-05-16
1987-03-10
Nase, Jeffrey V.
Fluid sprinkling, spraying, and diffusing
With means to vibrate or jiggle discharge
By electric transducer
198750, 222200, 239659, B05B 314
Patent
active
046485570
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a transport system for material which is in powdered, particulate, granular or the like form. The invention has particular, but not sole, application to devices which dispense powders and the like in drinks dispensing machines.
Conventionally hitherto in drinks dispensing machines, auger feed mechanisms have been employed to transfer freeze dried material from a hopper to a mixing chamber. Such mechanisms do not dispense an accurate dose of material because the volume of material transferred in a given interval of time depends upon the speed of the auger motor and on the flow of material within the hopper. The motor speed fluctuates with the load on the auger such that the dose of material varies with hopper content.
It is an object of the invention to provide a transparent system which in operation transports an accurately controllable quantity of material which is in powdered, particulate, granular or the like form, and which transport system may be employed to dispense and accurate dose of material for example in drinks dispensing machnes.
In accordance with this invention, there is provided a transport system for material in powdered, particulate, granular or the like form, comprising a body provided with a flow channel for the material, the channel being generally horizontal in use, and having an inlet for receiving said material and, spaced from said inlet, an outlet for dispensing said material, and an ultrasonic transducer coupled to said body and arranged to establish an ultrasonic standing wave effective to displace material along said flow channel from said inlet to said outlet.
Embodiments of the invention will now be more particularly described by way of example and with reference to the accompanying drawings, in which:
FIG. 1 is a schematic illustration, for explaining the principles of operation underlying the invention, of a body in the form of a cylindrical rod in which an ultrasonic standing wave is established;
FIG. 2 is to illustrate qualitatively radial/flexural displacement amplitude in a stepped horn with a hollow output section;
FIG. 3 is a longitudinal, vertical section through a first embodiment of powder dispenser in accordance with this invention;
FIG. 4 is a longitudinal, vertical section through a second embodiment of powder dispenser in accordance with this invention;
FIG. 5 is a section on the line V--V of FIG. 6 showing in plan view a third embodiment of dispenser;
FIG. 6 is a vertical section through the third embodiment of powder dispenser;
FIG. 7 is a vertical section through a fourth embodiment of powder dispenser;
FIG. 8 is a vertical longitudinal section through a fifth embodiment of powder dispenser; and
FIG. 9 is an end elevation of the dispenser shown in FIG. 8.
Referring to FIG. 1, there is shown a body 1 in the form of a cylindrical rod and in which a standing compression wave is established by means of an ultrasonic transducer (not shown) coupled to the rod. The length of the rod is equal to one half of the wavelength .lambda. of the standing wave with the vibration amplitude being a maximum at each end (antinodes of the standing wave) and a minimum at the central nodal plane, as schematically shown in FIG. 1 below the rod 1. A particle resting on the rod surface would be excited to vibrate at an amplitude of the standing wave at that point of the length of the rod. Movement of the particle towards either free end of the rod would require an increase in particle amplitude, whilst movement towards the node would permit a decrease in particle amplitude. Thus free particles, seeking naturally the lowest energy state, move towards the nodal plane.
FIG. 2 shows a stepped horn with a hollow output end, designed primarily as a quarter wave stepped velocity transformer having a hollow output section. The overall length of the horn is equal to a half wavelength for the selected material and frequency.
In addition the inner and outer diameters are chosen so that the mean circumference of the hollow output end is close to a half wavelength. This e
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patent: 3727801 (1973-04-01), Caridis et al.
patent: 3986669 (1976-10-01), Martner
Edelbrock Daniel R.
General Dispensing Systems Limited
Nase Jeffrey V.
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