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An Exhaust Machine For Use In The Manufacture Of Fluorescent Lamps
Abstract: An exhaust machine for use in the manufacture of fluorescent lamps. The machine (1) comprises a turret (2) mounted on a vertical shaft (3) disposed for intermittent rotational movement about a vertical axis and adapted to describe rotational movement about a heating and evacuation zone (14), an evacuation and activation zone (15) and a top end sealing zone (16). The heating and evacuation zone comprises a semicircular open ended heating chamber (17)defined by two spaced apart semicircular sidewalls (18). Each of the sidewalls has an insulator layer (19) at the inner side thereof and an infrared gas burner (20) uniformly extending over the entire insulator layer. The burners are connected to a fuel gas and air mixer (21) which in turn is connected to a regulated fuel gas supply (22) and a regulated air supply (23) (Fig 2).
Notices, Deadlines & Correspondence
Patent Information
Applicants
CROMPTON GREAVES LTD
Inventors
1. RAO YADLAPALLI KONDALA
2. AMIN MUKUND
Specification
FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
PROVISIONAL SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
An improved method for heat assisted evacuation of glass tubes
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTORS
Rao Yadlapalli Kondala and Amin Mukund, Crompton Greaves Limited, Maintenance Department, Lighting Division, Village - Kural, Baroda 391430, Gujarat, India
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention:
Field of invention
The invention provides a method for heat assisted evacuation of glass tubes wherein the heating is carried out by infrared irradiation
Background
During fluorescent lamp manufacturing, glass tubes coated with fluorescent powder are first evacuated and then filled with desired inert gases at prescribed pressures required for striking and maintaining an electric gas discharge. Evacuation of the glass tubes is conventionally achieved by suction means or by flow evacuation method, each with concurrent resistive heating using electric coils. The efficiency of heat transfer from electric coils to the glass tubes during such resistive heating is rather poor and consequently desirable vacuum levels are often not achieved in the glass tubes. There is a need for an improved method for heat assisted evacuation of glass tubes.
Detailed description
Accordingly the invention provides an improved method for heat assisted evacuation of glass tubes wherein the heating is carried out by infrared irradiation.
In one embodiment, the invention provides an improved method for heat assisted evacuation of glass tubes, the method comprising providing suction means at the end openings of the glass tubes with concurrent heating wherein the heating is done by irradiation of glass tubes with infrared radiation having wave length in the range of 2.4 microns to 4.0 microns emanating from a gas fired infrared heating system.
In another embodiment, the invention provides an improved method for heat assisted evacuation of glass tubes, the method comprising providing suction means at the end openings of the glass tubes with concurrent heating wherein the heating is done by irradiation of glass tubes with infrared radiation having wave length in the range of 2.4 microns to 4.0 microns emanating from a gas fired infrared heating system wherein the tubes to be heated are centrally arranged between adjacent concentric arcs defined by a plurality of gas fired infrared burners
In a further embodiment, the invention provides a gas fired infrared heating system for heat assisted evacuation of glass tubes, the system comprising plurality of gas fired infrared burners defining concentric arcs around glass tubes being heated, the heating being carried out with concurrent evacuation.
The heating system of the invention provide enhanced heat transfer area and improves the efficiency of heating and evacuation of glass tubes. In an advantageous embodiment the glass tubes of the invention are that used for manufacturing fluorescent lamps. Typically the tubes are heated up to 550°C. The higher efficiency in heating rendered by the usage of the infrared heating system of the invention enables to achieve a vacuum of up to 0.002 torr. Consequently, gaseous impurities such as oxygen, nitrogen and moisture are minimized inside the tube resulting in better performance of the manufactured fluorescent lamps.
Further the heating system of the invention is environmentally friendly as well as cost effective.
Dated this 31st day of March 2008
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 726-MUM-2008-AbandonedLetter.pdf | 2018-08-10 |
| 1 | 726-MUM-2008-FORM 26(19-10-2011).pdf | 2011-10-19 |
| 2 | 726-MUM-2008-ABSTRACT(5-3-2009).pdf | 2018-08-10 |
| 2 | 726-MUM-2008-FORM 13(19-10-2011).pdf | 2011-10-19 |
| 3 | 726-MUM-2008-FORM 1(19-10-2011).pdf | 2011-10-19 |
| 3 | 726-MUM-2008-CLAIMS(5-3-2009).pdf | 2018-08-10 |
| 4 | 726-MUM-2008-CORRESPONDENCE(19-10-2011).pdf | 2011-10-19 |
| 4 | 726-MUM-2008-CORRESPONDENCE(10-8-2010).pdf | 2018-08-10 |
| 5 | 726-MUM-2008-DUPLICATE-FER-2017-07-26-14-36-37.pdf | 2017-07-26 |
| 5 | 726-MUM-2008-CORRESPONDENCE(2-11-2011).pdf | 2018-08-10 |
| 6 | 726-MUM-2008-POWER OF ATTORNEY-060916.pdf | 2018-08-10 |
| 6 | 726-mum-2008-correspondence(21-5-2008).pdf | 2018-08-10 |
| 7 | 726-MUM-2008-OTHERS-060916.pdf | 2018-08-10 |
| 7 | 726-MUM-2008-CORRESPONDENCE(5-3-2009).pdf | 2018-08-10 |
| 8 | 726-mum-2008-form-3.pdf | 2018-08-10 |
| 8 | 726-mum-2008-correspondence-received.pdf | 2018-08-10 |
| 9 | 726-mum-2008-description (provisional).pdf | 2018-08-10 |
| 9 | 726-mum-2008-form-26.pdf | 2018-08-10 |
| 10 | 726-MUM-2008-DESCRIPTION(COMPLETE)-(5-3-2009).pdf | 2018-08-10 |
| 10 | 726-mum-2008-form-2.pdf | 2018-08-10 |
| 11 | 726-MUM-2008-DRAWING(5-3-2009).pdf | 2018-08-10 |
| 12 | 726-MUM-2008-FER.pdf | 2018-08-10 |
| 12 | 726-mum-2008-form-1.pdf | 2018-08-10 |
| 13 | 726-MUM-2008-FORM 1(2-11-2011).pdf | 2018-08-10 |
| 13 | 726-MUM-2008-Form 6-060916.pdf | 2018-08-10 |
| 14 | 726-mum-2008-form 1(21-5-2008).pdf | 2018-08-10 |
| 14 | 726-MUM-2008-FORM 5(5-3-2009).pdf | 2018-08-10 |
| 15 | 726-MUM-2008-FORM 13(2-11-2011).pdf | 2018-08-10 |
| 15 | 726-MUM-2008-FORM 26(2-11-2011).pdf | 2018-08-10 |
| 16 | 726-MUM-2008-Form 13-060916.pdf | 2018-08-10 |
| 16 | 726-MUM-2008-FORM 26(10-8-2010).pdf | 2018-08-10 |
| 17 | 726-mum-2008-form 2(title page)-(provisional)-(31-3-2008).pdf | 2018-08-10 |
| 17 | 726-MUM-2008-FORM 18(10-8-2010).pdf | 2018-08-10 |
| 18 | 726-MUM-2008-FORM 2(TITLE PAGE)-(5-3-2009).pdf | 2018-08-10 |
| 18 | 726-mum-2008-form 2(5-3-2009).pdf | 2018-08-10 |
| 19 | 726-mum-2008-form 2(5-3-2009).pdf | 2018-08-10 |
| 19 | 726-MUM-2008-FORM 2(TITLE PAGE)-(5-3-2009).pdf | 2018-08-10 |
| 20 | 726-MUM-2008-FORM 18(10-8-2010).pdf | 2018-08-10 |
| 20 | 726-mum-2008-form 2(title page)-(provisional)-(31-3-2008).pdf | 2018-08-10 |
| 21 | 726-MUM-2008-Form 13-060916.pdf | 2018-08-10 |
| 21 | 726-MUM-2008-FORM 26(10-8-2010).pdf | 2018-08-10 |
| 22 | 726-MUM-2008-FORM 13(2-11-2011).pdf | 2018-08-10 |
| 22 | 726-MUM-2008-FORM 26(2-11-2011).pdf | 2018-08-10 |
| 23 | 726-mum-2008-form 1(21-5-2008).pdf | 2018-08-10 |
| 23 | 726-MUM-2008-FORM 5(5-3-2009).pdf | 2018-08-10 |
| 24 | 726-MUM-2008-Form 6-060916.pdf | 2018-08-10 |
| 24 | 726-MUM-2008-FORM 1(2-11-2011).pdf | 2018-08-10 |
| 25 | 726-MUM-2008-FER.pdf | 2018-08-10 |
| 25 | 726-mum-2008-form-1.pdf | 2018-08-10 |
| 26 | 726-MUM-2008-DRAWING(5-3-2009).pdf | 2018-08-10 |
| 27 | 726-MUM-2008-DESCRIPTION(COMPLETE)-(5-3-2009).pdf | 2018-08-10 |
| 27 | 726-mum-2008-form-2.pdf | 2018-08-10 |
| 28 | 726-mum-2008-description (provisional).pdf | 2018-08-10 |
| 28 | 726-mum-2008-form-26.pdf | 2018-08-10 |
| 29 | 726-mum-2008-correspondence-received.pdf | 2018-08-10 |
| 29 | 726-mum-2008-form-3.pdf | 2018-08-10 |
| 30 | 726-MUM-2008-CORRESPONDENCE(5-3-2009).pdf | 2018-08-10 |
| 30 | 726-MUM-2008-OTHERS-060916.pdf | 2018-08-10 |
| 31 | 726-mum-2008-correspondence(21-5-2008).pdf | 2018-08-10 |
| 31 | 726-MUM-2008-POWER OF ATTORNEY-060916.pdf | 2018-08-10 |
| 32 | 726-MUM-2008-DUPLICATE-FER-2017-07-26-14-36-37.pdf | 2017-07-26 |
| 32 | 726-MUM-2008-CORRESPONDENCE(2-11-2011).pdf | 2018-08-10 |
| 33 | 726-MUM-2008-CORRESPONDENCE(19-10-2011).pdf | 2011-10-19 |
| 33 | 726-MUM-2008-CORRESPONDENCE(10-8-2010).pdf | 2018-08-10 |
| 34 | 726-MUM-2008-FORM 1(19-10-2011).pdf | 2011-10-19 |
| 34 | 726-MUM-2008-CLAIMS(5-3-2009).pdf | 2018-08-10 |
| 35 | 726-MUM-2008-FORM 13(19-10-2011).pdf | 2011-10-19 |
| 35 | 726-MUM-2008-ABSTRACT(5-3-2009).pdf | 2018-08-10 |
| 36 | 726-MUM-2008-FORM 26(19-10-2011).pdf | 2011-10-19 |
| 36 | 726-MUM-2008-AbandonedLetter.pdf | 2018-08-10 |
Search Strategy
| 1 | strategy_21-03-2017.pdf |