US3746257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection systems more particularly for liquid fuel burners
Assignee: Eaton Corp
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Filing: 1971-06-21
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Granted: 1973-07-17
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Expires: 1991-06-21
Abstract
Abstract In order to obtain at low fuel-supply rates the benefit of ultrasonic atomisation assistance in the case of a swirl-type atomiser nozzle, the small-diameter horn of an ultrasonic vibrator extends axially through the swirl chamber of a swirl atomiser into close vicinity of the final outlet orifice of the conical end portion of the chamber so that the active tip of the horn can atomise the fuel as the fuel passes through the orifice while the horn is cleared by the hollow core of the swirl when the fuel-supply rate is sufficeint to ensure swirl atomisation. A pressure-sensitive switch then preferably cuts off the energisation of the oscillator for the ultrasonic transducer. A change-over valve controlled by the pressure-sensitive switch may be employed for diverting at low flow rates the fuel flow so that instead of entering the swirl chamber the fuel flows through an axial bore of the atomiser horn.
Inventors
- 👤 M Broad
- 👤 N Ilford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:49
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/34; F23D11/345
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
231 words
An atomizing device for liquid fuel and other liquids, which comprises: a body containing a swirl chamber of circular crosssection, a liquid-inlet passage leading tangentially into said chamber, and a nozzle outlet that extends axially from said chamber and has a throat whose diaMter is smaller than that of the swirl chamber; means for supplying liquid to said inlet passage at a rate which is variable between an upper range in which the energy of the liquid entering the chamber through said inlet passage is sufficient to form in said chamber a vortex that produces at the nozzle exit effective swirl atomization of the liquid leaving the chamber through the nozzle and has an internal cavity of predetermined minimum dimensions, and a lower range in which the energy of the liquid entering the swirl chamber is insufficient to form such atomization producing such vortex, an ultrasonic vibrator having a stem terminating in a tip, the vibrator being so connected to said body that said stem extends in the swirl chamber along the axis thereof, the tip of the stem body located within the internal cavity of the vortex formed when the rate of liquid supply is in said upper range, said tip being located approximately in the plane of the said throat, and the vibrator being operative when energised to vibrate the said tip in the longitudinal direction of the stem.
Claim 2
Dependent Claim
231 words
An atomizing device for liquid fuel and other liquids, which comprises: a body containing a swirl chamber of circular crosssection, a liquid-inlet passage leading tangentially into said chamber, and a nozzle outlet that extends axially from said chamber and has a throat whose diaMter is smaller than that of the swirl chamber; means for supplying liquid to said inlet passage at a rate which is variable between an upper range in which the energy of the liquid entering the chamber through said inlet passage is sufficient to form in said chamber a vortex that produces at the nozzle exit effective swirl atomization of the liquid leaving the chamber through the nozzle and has an internal cavity of predetermined minimum dimensions, and a lower range in which the energy of the liquid entering the swirl chamber is insufficient to form such atomization producing such vortex, an ultrasonic vibrator having a stem terminating in a tip, the vibrator being so connected to said body that said stem extends in the swirl chamber along the axis thereof, the tip of the stem body located within the internal cavity of the vortex formed when the rate of liquid supply is in said upper range, said tip being located approximately in the plane of the said throat, and the vibrator being operative when energised to vibrate the said tip in the longitudinal direction of the stem.
Claim 3
Dependent Claim
20 words
A device as claimed in claim 1, wherein the vibrator stem terminates short of the throat of the nozzle outlet.
Claim 4
Dependent Claim
48 words
A device as claimed in claim 1, which includes a pressure-responsive switch subject to the pressure of the liquid supplied to said inlet passage and operative to cut-off energisation of the vibrator when the said pressure is sufficient to supply liquid at a rate within said upper range.
Claim 5
Dependent Claim
88 words
A device as claimed in claim 1 wherein the vibrator stem has a longitudinal bore leading to an orifice at the tip of the stem, and wherein the device includes a pressure-responsive change-over switch subject to the pressure of the liquid supplied by said liquid-supplying means and operative to divert the liquid supplied so as to admit it to said bore instead of admitting it to the swirl chamber when the said pressure is insufficient to supply liquid to said chamber at a rate within said upper range.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |