Claims:We Claim:
1. A cooling passage (101) for an injector (102), said cooling passage (101) comprising:
a flow path (101a) adapted to receive air from a source (200); and
at least one section (101b) in said flow path (101a) adapted to pass said air onto said injector (102) .

2. The cooling passage (101) as claimed in claim 1, wherein flow of said air into said cooling passage (101) is controlled by a control unit (300).

3. The cooling passage (101) as claimed in claim 2, wherein said control unit (300) controls the flow of said air onto said injector (102).

4. The cooling passage (101) as claimed in claim 1, wherein source (200) is an air chamber.

5. The cooling passage (101) as claimed in claim 1, wherein said at least one section (101b) is at least one of a perforation, a hole, a gap and an opening.
6. The cooling passage (101) as claimed in claim 1, wherein said cooing passage (101) is attached to said injector (102) by a clamping means (101c).

7. The cooling passage (101) as claimed in claim 1, wherein said cooling passage (101) is mounted onto said injector (102).

8. The cooling passage (101) as claimed in claim 1, wherein a valve is located in between said source (200) and said flow path (101a).
, Description:Complete Specification:
The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed.
Field of the invention
[0001] The invention relates to a cooling passage for a Fuel injector.

Background of the invention
[0002] Fuel injectors are the components that are responsible for the final stage of fuel delivery in the fuel injection systems. High-pressure fuel is delivered to the injector, which is activated by an engine control unit or fuel injector control module. When activated, the injector shortly opens a valve that allows a precise amount of fuel to spray out. Although a fuel injection system may have a single injector i.e. central-point injection or several i.e. multiport injection, and injectors vary somewhat in design from one application to another, they all perform that same basic function.

[0003] Prior art patent application US6192677 B1 discloses an apparatus and method for the after-treatment of exhaust gases from an internal combustion engine operating with excess air. An injection valve of a reducing agent metering device is enclosed in a double-walled valve-holding element that is connected directly to the exhaust-gas line. It is thereby possible to blow pressurized air into an air gap between an outer wall and an inner wall of the valve-holding element and, as a result, to cool at least those parts of the injection valve that are in close vicinity to the exhaust gas.

Brief description of the accompanying drawings:
[0004] Different modes of the invention are disclosed in detail in the description and illustrated in the accompanying drawings:

[0005] FIG. 1 illustrates a cooling passage with a Fuel injector according to an embodiment in the invention; and

[0006] FIG. 2 illustrates a top view of a cooling passage according to an embodiment in the invention.

Detailed description of the embodiments
[0007] Figure 1 illustrates a cooling passage 101 for a fuel injector 102 according to an embodiment of the disclosure. A cooling passage 101 for an injector 102 comprises a flow path 101a adapted to receive air from a source 200 and at least one section 101b in the flow path 101a adapted to pass the air onto the injector 102. The flow path 101a here is sealed at one end and the other end is connected to the source 200.

[0008] In the cooling passage 101, a control unit 300 controls the flow of air. The control unit 300 also controls the duration of air in the cooling passage 101. The control unit 300 decides the amount of air to be sent to the cooling passage 101. In addition, the control unit 300, depending upon the heating temperature of the fuel injector 102, maintains the pressure, flow & duration of the air. The control unit 300 controls the flow of the air onto the injector 102. The amount of air directed onto the injector 102 is based upon the heating temperature of the injector 102.

[0009] In the cooling passage 101, the source 200 is an air chamber.
The source contains air at a temperature. For example, the air can have a lower temperature sufficient to cool the injector 102. The air chamber has air to flow into the cooling passage 101. The source 200 is not limited to the air chamber but to a device, which holds air, and is known to the person skilled in the art. For example the source 200 can be the air intake manifold of the engine etc. According to an embodiment of the disclosure, the source is mounted on the injector 102 by a clamp.

[0010] Figure 2 illustrates a top view cooling passage 101 according to an embodiment of the disclosure. In the above-disclosed disclosure, at least one section 101b is at least one of a perforation, a hole, a gap and an opening. The section 101b here is not limited to any of the above-disclosed terminologies but to a device, which allows air to flow onto the injector 102 and known to the person skilled in the art. The sections 101b is not limited to any particular number and is made as per the requirement. The air from the section 101b flows onto the injector 102 along a direction, which is adjusted, based on the requirement and the air flow is controlled by the control unit 300.

[0011] According to an embodiment of the disclosure, the cooling passage 101 is attached to the fuel injector 102 by a clamping means 101c. The clamping means 101c is a fastening device to hold or secure objects tightly together to prevent movement or separation through the application. The clamping means 101c are also used for positioning components during construction. The cooling passage 101 can accommodate multiple fuel injectors 102 at the same time to cool all the injectors 102 at the same time.

[0012] According to an embodiment of the disclosure, in the cooling passage 101, a valve is located between the source 200 and the flow path 101a. A control unit 300 controls the opening and closing of the valve for cool air to pass into the flow path 101a from the source 200. The purpose of the valve is to ensure timing and duration of air coming from the source 200 to the flow path 101a.

[0013] The cooling passage 101 is mounted onto the injector 102. The cooling passage 101 is an external passage to cool the injector 102 from outside by flowing the air on the injector 102. The air flowing into the cooling passage 101 is forced onto the injector 102 so that it cools the injector 102 components. The cooling passage 101 surrounds the fuel injector 102 from outside so that the air from section 200 is directed to the sub components of the injector 102.

[0014] In the disclosure disclosed above, the cooling passage 101 concept is to reduce or limit the temperature on sub components of injector 102 for example solenoid. In other words, it is a way to protect the temperature sensitive sub components and thereby protecting the injector 102 from overheating. Here forced air is used to expedite the rate of cooling or limit the raise of temperature in injector 102.

[0015] ‘Adapted’ or ‘arranged’, in the context of the instant disclosure, refers to the technical capability or the technical capacity of a component, in relation to which the term ‘adapted’ or ‘arranged’ is used, to carry out or executed a specified action or actions, upon the requirement of the specified action or actions to be carried out or executed. Moreover, the usage of the term ‘adapted’ or ‘arranged’ here, is in reference with the normal technical capability or technical capacity of the component, imparted by the design or the structure or the composition of the component, and not in reference with any special or extraneous capability or capacity, beyond the scope of the normal technical capability or technical capacity. Therefore, there is a need to address this problem
[0016] It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.