FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See Section 10; rule 13] "A SOLENOID PURGE VALVE"
ADVIK HI-TECH PVT. LTD.
an Indian private Limited Company,
Plot No. B-5, Chakan Industrial Area, Phase II,
Village-Vasuli, Tai-Khed,
Dist-Pune, Pin-410501
Email: cie@advik.co.in
The following specification describes the invention and the manner in which it is
to be performed.

FIELD OF INVENTION
[0001] The present invention relates to a solenoid purge valve, and more particularly the present invention relates to the solenoid purge valve for evaporative emission control in vehicles.
BACKGROUND OF THE INVENTION
[0002] An emission of air pollutants such as hydrocarbons, carbon monoxide, nitrogen oxide, sulphur oxide etc. in atmosphere have shown severe effects on health of living organism and environment. Escape of fuel vapours from the fuel tank of a vehicle is a major source of evaporative emission. In past few decades the evaporative emission standards have been introduced throughout the globe. The emission standards define the acceptable limit of release of air pollutants into atmosphere. To follow the emission standards set by the governments of respective countries the use of evaporative emission control device has become mandatory.
[0003] Such kind of device used to control the evaporative emission from a
vehicle is a solenoid purge valve. In evaporative emission control system fuel vapours inside the fuel tanks are allowed to be accumulated in the closed chamber called as canister. The solenoid purge valve is an electromechanical device that allows fuel vapours that are stored in canister to transmit into engine through throttle body or carburettor. A solenoid purge valve is a one-way valve having normally closed condition. A purge control valve operates on specific frequency range along with Duty ratio. It consists of an electromechanical arrangement for the actuation with ON-OFF mode or PWM operated proportional discharge mode. The electrical input is received from the ECU.
[0004] Referring to Fig. 1, the conventional solenoid purge valve (100) is
shown. Conventionally the solenoid purge valve includes a housing (110), a connector (110a), a cover (120) having an inlet (120a) and an outlet (120b), an excitation coil (130), a fixed core (140), a pin (150), a movable core (160), a sealing rubber (170), a spring (180) etc. The pin (150) is fixed inside a cylinder bore at the upper end of the fixed core (140). When said solenoid purge valve (100) gets

energized, the electromagnetic field get generated inside the housing (110). Due to effect of said magnetic field the movable core (160) gets attracted towards the fixed core (140). As the movable core (160) gets attracted towards the fixed core (140), it opens the outlet (120b), that enables fuel vapours from canister to travel to engine due to vacuum creation in suction stroke.
[0005] The pin (150) is adapted to guide the spring (180) that also restricts the buckling of the spring (180) due to movement of the movable core (160). The cylindrical bore present at the first end (140a) of the fixed core (140) causes cutting of flux lines that results in reduced magnetic field strength.
[0006] The another problem observed in the conventional solenoid purge valve is noise generation due to direct contact between the movable core (160) and the fixed core (140) due to actuation of valve during open state. This noise not only causes discomfort to the operator but also affects the overall performance of the valve (100).
[0007] To overcome aforementioned drawbacks present in the conventional solenoid purge valve, there is a need of the solenoid purge valve having improved magnetic field strength along with noise reduction capability.
OBJECTS OF THE INVENTION
[0008] The main object of a present invention is to provide a solenoid purge__ valve having improved magnetic field strength.
[0009] The another object of the present invention is to provide the solenoid purge valve having noise reduction capacity.
[00010] The another object of the present invention is to provide the solenoid purge valve that is cost effective.
[00011] The another object of the present invention is to provide the solenoid purge valve with compact design.

[00012] The another object of the present invention is to provide the solenoid purge valve that improves overall efficiency.
SUMMARY OF THE INVENTION
[00013] A solenoid purge valve (200) includes a housing (210) having a connector (210a) and a bobbin (210b); a yoke (220) having at least one mounting (220a) and plurality of crimping lugs (220b); a cover (230) having an inlet (230a) and an outlet (230b); an excitation coil (240) that is wound on the bobbin (210b); a fixed core (250); a movable core (260); a sealing rubber (270); a spring (280); at least one o-ring (290); a base plate (295); and a stopper (265), wherein the solenoid purge valve (200) is configured to provide improved magnetic performance and noise reduction capability. The fixed core (250), the movable core (260), the sealing rubber (270), the stopper (265) and the spring (280) are disposed inside the bobbin (210b). The fixed core (250), the movable core (260), the sealing rubber (270), the stopper (265) and the spring (280) are coaxially aligned. The housing (210) and the cover (230) are coaxially aligned by means of improved sealing and arresting arrangement. The stopper (265) is configured to prevent direct contact of the fixed core (250) with the movable core (260). In the another embodiment of the present invention the sealing rubber (270) is configured to prevent direct contact of the fixed core (250) with the movable core (260). The inlet (230a) and the outlet (230b) are forming acute angle so as to provide flow path with less turbulence. The mounting (220a) is configured to prohibit undesired rotation of the solenoid purge valve (200).
BRIEF DESCRIPTION OF THE DRAWINGS
[00014] The accompanying drawings constitute a part of the description and are used to provide further understanding of the present invention. Such accompanying drawings illustrate the embodiments of the present invention which are used to describe the principles of the present invention together with the description.

[00015] Fig. 1 shows a cross sectional view of a conventional solenoid purge valve disclosed in the prior art;
[00016] Fig. 2 shows a front perspective view of a solenoid purge valve in accordance with the preferred embodiment of a present invention;
[00017] Fig. 3a shows a cross sectional view of the solenoid purge valve in close condition in accordance with the preferred embodiment of the present invention;
[00018] Fig, 3b shows a cross sectional view of the solenoid purge valve in close condition in accordance with the another embodiment of the present invention;
[00019] Fig. 4a shows a cross sectional view of the solenoid purge valve in open condition in accordance with the another embodiment of the present invention; and
[00020] Fig. 4b shows a cross sectional view of the solenoid purge valve in open condition in accordance with the another embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[00021] As used in the description herein and throughout the claims that follow, the meaning of "a," "an," and "the" includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of "in" includes "in" and "on" unless the context clearly dictates otherwise.
[00022] If the specification states a component or feature "may", "can", "could", or "might" be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[00023] Exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. This disclosure may however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be through and complete and will fully convey the scope of the disclosure to those of ordinary skill in the art.

Moreover, all statements herein reciting embodiments of the disclosure, as well as specific examples thereof, are intended to encompass both structural and functional equivalents thereof. Additionally, it is intended that such equivalents include both currently known equivalents as well as equivalents developed in the future (i.e., any elements developed that perform the same function, regardless of structure).
[00024] Fig. 2 and Fig. 3 show a front perspective view and a cross sectional view of a solenoid purge valve (200) in accordance with the preferred embodiment of a present invention is shown. The solenoid purge valve (200) includes a housing (210) having a connector (210a), a yoke (220), a cover (230), an inlet (230a), an outlet (230b), an excitation coil (240), a fixed core (250), a movable core (260), a stopper (265), a sealing rubber (270), a spring (280), at least one o-ring (290) and a base plate (295). The solenoid purge valve (200) is configured to remain in normally close condition.
[00025] The housing accommodates a bobbin (210b) on that the excitation coil is wound. The excitation coil (240) is configured to receive electrical supply from the connector (210a). The excitation coil can be made up of copper or aluminium or any other conductive material. The bobbin is preferably made up of a plastic.
[00026] The fixed core (250) having a first end (250a) and second end (250b) (not shown in Fig.) is coaxially disposed inside the bobbin (210b) wherein the second end (250b) is placed on the base plate (295). In the preferred embodiment of the present invention, the fixed core (250) is having flat shape and configured to improve magnetic force generation capacity, wherein in other embodiments of the invention the fixed core can be of any other shape.
[00027] The movable core (260), the sealing rubber (270), the stopper (265) and the spring (280) are coaxially placed on the first end (250a) of the fixed core (250), wherein the stopper (265) is configured to prevent direct contact of the fixed core (250) with the movable core (260). The said arrangement is configured to reduce noise generation due to contact of the fixed core (250) and the movable core (260). The stopper (265) also helps to prevent buckling of the spring (280).

[00028] The cover (230) having the inlet (230a) and the outlet (230b) is positioned on the housing (210) such that the inlet (230a) is coaxially aligned with the movable core (260). The inlet (230a) and the outlet (230b) are forming acute angle with each other, the said arrangement is configured to provide air flow path with less turbulence.
[00029] The yoke (220) is configured to accommodate the housing (210) and the cover (230). The yoke further includes a mounting (220a), a mounting lug (220c) having anti- rotation feature and a plurality of crimping lugs (220b). The crimping lugs (220b) are adapted to seal the base plate so as to form enclosed assembly of the solenoid purge valve (200).
[00030] The Fig. 3b shows a cross sectional view of the solenoid purge valve in accordance with the another embodiment of the present invention. In the another embodiment the sealing rubber (270) is configured to provide sealing as well as to prevent direct contact of the fixed core (250) with the movable core (260).
[00031] Referring to Fig. 3a, Fig. 3b, Fig. 4a and Fig. 4b the operational characteristics of the solenoid purge valve is explained. The solenoid purge valve (200) is configured to be remain in normally closed condition.
[00032] The Fig. 3a and Fig. 4a show the solenoid purge valve (200) in close condition and open condition respectively. When the solenoid purge valve (200) receives electrical input at the connector (210a), then the movable core (260) gets attracted towards the fixed core (250), hence an airflow path from the inlet (230a) to the outlet (230b) becomes open to transfer the fuel vapours accumulated inside canister to the internal combustion engine through a throttle assembly. The stopper (265) is configured to prevent direct contact of the fixed core (250) with the movable core (260).
[00033] Referring to Fig. 3b and Fig. 4b another embodiment of the present invention, the sealing rubber (270) is configured to prevent direct contact of the fixed core (250) with the movable core (260).

[00034] In the above detailed description, reference is made to the accompanying drawings that form a part thereof, and illustrate the best mode presently contemplated for carrying out the invention. However, such description should not be considered as any limitation of scope of the present invention. The structure thus conceived in the present description is susceptible of numerous modifications and variations, all the details may furthermore be replaced with elements having technical equivalence.
[00035] List of reference numerals:
1. A solenoid purge valve (200)
2. A housing (210)
3. A connector (210a)
4. A bobbin (210b)
5. A yoke (220)
6. A mounting (220a)
7. A crimping lug (220b)
8. A mounting lug (220c)
9. A cover (230)
10. An inlet (230a)
11. An outlet (230b)
12. An excitation coil (240)

13. A fixed core (250)
14. A movable core (260)
15. A stopper (265)
16. A sealing rubber (270)
17. A spring (280) 18.Ano-ring(290)

19. A sealing plate (295)
20. A first end (250a)
21. A second end (250b)

CLAIMS: We claim,
1. A solenoid purge valve (200) comprising:
a housing (210) having a connector (210a) and a bobbin (210b);
a yoke (220) having at least one mounting (220a) and plurality of crimping lugs (220b);
a cover (230) having an inlet (230a) and an outlet (230b);
an excitation coil (240) that is wound on the bobbin (210b);
a fixed core (250);
a movable core (260);
a sealing rubber (270);
a spring (280);
at least one o-ring (290);-
a base plate (295); and
a stopper (265), wherein the solenoid purge valve (200) is configured to provide improved magnetic performance and noise reduction capability.
2. The solenoid purge valve (200) as claimed in claim 1; wherein the fixed core (250), the movable core (260), the sealing rubber (270), the stopper (265) and the spring (280) are disposed inside the bobbin (210b).

3. The solenoid purge valve (200) as claimed in claim 2; wherein the fixed core
(250), the movable core (260), the sealing rubber (270), the stopper (265) and the
spring (280) are coaxially aligned.
4. The solenoid purge valve (200) as claimed in claim 1; wherein the housing (210)
and the cover (230) are coaxially aligned by means of improved sealing and
arresting arrangement.
5. The solenoid purge valve (200) as claimed in claim 1; wherein the stopper (265) is configured to prevent direct contact of the fixed core (250) with the movable core (260).
6. The solenoid purge valve (200) as claimed in claim 1; wherein in the another embodiment of the present invention the sealing rubber (270) is configured to prevent direct contact of the fixed core (250) with the movable core (260).
7. The solenoid purge valve (200) as claimed in claim 1; wherein the inlet (230a) and the outlet (230b) are forming acute angle so as to provide flow path with less turbulence.
8. The solenoid purge valve (200) as claimed in claim 1; wherein the mounting (220a) is configured to prohibit undesired rotation of the solenoid purge valve (200).