E-VAPING DEVICE, METHOD OF CONTROLLING RESISTANCE-TO-DRAW (RTD) FOR THE E-VAPING DEVICE AND METHOD OF ESTABLISHING A DESIRED RTD

• US 20180271173A1
• Filed: 05/31/2018
• Published: 09/27/2018
• Est. Priority Date: 07/24/2013
• Status: Active Grant

• Current Assignee: Altria Client Services LLC (Altria Group, Inc.)
• Original Assignee: Altria Client Services LLC (Altria Group, Inc.)
• Inventors: JANARDHAN, Srinivasan, Hawes, Eric, Pithawalla, Yezdi B.
• Granted Patent: US 10,729,183 B2
• Time in Patent Office: Days
• CPC Class Codes: A24F 40/10 Devices using liquid inhalable precursors
• CPC Class Codes: A24F 40/40 Constructional details, e.g. connection of cartridges and battery parts
• CPC Class Codes: A24F 40/485 Valves; Apertures

Abstract

The e-vaping device includes a housing, the housing defining one or more inlets, a power source, and a cartridge. The cartridge includes a reservoir containing a pre-vapor formulation. A heater and wick arrangement is in fluid communication with the reservoir. An annular seal is in fluid communication with the one or more inlets. The annular seal defines a first air passage. A flow restrictor is held by the annular seal. The flow restrictor defines a second air passage, the second air passage being configured to provide a desired resistance-to-draw (RTD) for the e-vaping device. A combined airflow cross-sectional area of the one or more inlets is greater than an airflow cross-sectional area of the second air passage. The flow restrictor is made from a first material that is harder than a second material for the annular seal.

Claims

1. An e-vaping device, comprising:

a housing extending in a longitudinal direction, the housing defining one or more inlets configured to allow air to be drawn into the e-vaping device;

a power source located within the housing; and

a cartridge on an end of the e-vaping device, at least a portion of the housing forming an outer surface of the cartridge, the cartridge including,

a reservoir configured to contain a pre-vapor formulation,

a heater and wick arrangement in fluid communication with the reservoir, the heater and wick arrangement being operative to volatilize the pre-vapor formulation to produce a vapor,

an annular seal in fluid communication with the one or more inlets, the annular seal having an outer surface configured to seal with an interior surface of the housing, the annular seal defining a first air passage,

a flow restrictor being held by the annular seal, the flow restrictor defining a second air passage, the second air passage being configured to provide a desired resistance-to-draw (RTD) for the e-vaping device, wherein a combined airflow cross-sectional area of the one or more inlets is greater than an airflow cross-sectional area of the second air passage,

wherein the flow restrictor is made from a first material that is harder than a second material for the annular seal.

2. The e-vaping device of claim 1, wherein the flow restrictor is upstream of the heater and wick arrangement relative to an expected airflow path through the cartridge during normal operational use of the cartridge.

3. The e-vaping device of claim 1, wherein the flow restrictor is positioned on an end of the cartridge, the flow restrictor being configured to control an amount of airflow into the cartridge.

4. The e-vaping device of claim 1, further comprising;

a connector on a first end of the cartridge; and

a terminal on the first end of the cartridge, the terminal being held within the connector.

5. The e-vaping device of claim 1, wherein the first material is at least one of a plastic, stainless steel or a metal.

6. The e-vaping device of claim 1, further comprising:

control circuitry operable to control a supply of power from the power source to the heater and wick arrangement.

7. The e-vaping device of claim 1, wherein the flow restrictor is a tubular insert and the annular seal is a gasket.

8. The e-vaping device of claim 1, wherein the flow restrictor is a gasket.

9. The e-vaping device of claim 1, wherein the desired RTD is about 100 mm to 130 mm of water, the one or more inlets includes two inlets that each have a first internal diameter of about 0.5 to 1.0 mm, and the first air passage has an internal diameter of about 0.8 to 1.0 mm.

10. The e-vaping device of claim 9, wherein the desired RTD is about 119 mm of water, and the two inlets each have a first internal diameter that is about 0.63 mm.

11. A method of controlling resistance-to-draw of an e-vaping device, the e-vaping device including a power section, a cartridge and one or more ports at least partially defined by a housing, the method comprising:

providing an inlet on the cartridge, the inlet including,

an annular seal, and

a flow restrictor being held by the annular seal, the flow restrictor defining an air passage having a determined diameter configured to control a resistance-to-draw (RTD) for the e-vaping device, the inlet being located inside the housing, a combined airflow cross-sectional area of the one or more ports being greater than an airflow cross-sectional area of the air passage,

wherein the flow restrictor is made from a first material that is harder than a second material for the annular seal;

drawing an airflow from the one or more ports into the cartridge via the inlet;

heating a pre-vapor formulation from a reservoir to at least initially volatilize the pre-vapor formulation using a heater, the heater being in a central air channel, the inlet being upstream of the heater relative to an expected airflow path through the cartridge during normal operational use of the cartridge;

combining the at least initially volatilized pre-vapor formulation with the airflow from the inlet to form a saturated vapor within the central air channel; and

condensing the saturated vapor within a condensation chamber to form an unsaturated vapor, the condensation chamber being in fluid communication with the central air channel.

12. The method of claim 11, further comprising:

connecting a connector to an end of the cartridge, the connector being configured to connect the power section to the cartridge,

the connector having a plurality of circumferentially spaced apart slots, the slots being the one or more ports.

13. The method of claim 11, wherein the providing of the inlet on the cartridge further includes,

positioning the inlet on an end of the cartridge, the flow restrictor of the inlet being configured to control an amount of airflow into the cartridge.

14. The method of claim 11, wherein the providing of the inlet on the cartridge further includes,

making the first material from at least one of a plastic, stainless steel or a metal.

15. The method of claim 11, wherein the providing of the inlet on the cartridge further includes,

inserting a gasket on an end of the cartridge, the gasket being the annular seal, and

inserting a tubular insert in the gasket, the tubular insert being the flow restrictor.

16. The method of claim 11, wherein the providing of the inlet on the cartridge further includes,

inserting a gasket in the annular seal, the gasket being the flow restrictor.

17. A method of establishing a desired resistance-to-draw (RTD) consistently amongst a plurality of e-vaping devices, comprising:

establishing an airflow path within at least a first section of each e-vaping device, the first section including a heater and one or more air inlets;

inserting an annular seal within said airflow path, the annular seal being positioned within the first section, the annular seal defining a first air passage;

sealing a first end of the first section of each e-vaping device by affixing a connector on the first end, the connector holding a terminal; and

providing the desired RTD for each e-vaping device by,

disposing a flow restrictor within the first air passage, the flow restrictor defining a second air passage that establishes the desired RTD, wherein a combined airflow cross-sectional area of the one or more air inlets is greater than an airflow cross-sectional area of the second air passage, the flow restrictor being made from a first material that is harder than a second material for the annular seal.

18. The method of claim 17, wherein the disposing of the flow restrictor includes,

disposing the flow restrictor upstream of the heater relative to an expected airflow path through the first section during normal operational use of the first section.

19. The method of claim 17, wherein,

the inserting of the annular seal includes inserting a gasket within the airflow path, the gasket being the annular seal, and

the disposing of the flow restrictor includes disposing a tubular insert within the first air passage, the tubular insert being the flow restrictor.

20. The method of claim 17, wherein the disposing of the flow restrictor includes disposing a gasket within the first air passage, the gasket being the flow restrictor.