FIELD OF THE INVENTION

The present invention relates to an improved air by-pass valve. More particularly, the present invention relates to an improved blow off valve with a stagnant i.e. internally static flow limiter.

BACKGROUND OF THE INVENTION

A blow off valve or compressor bypass valve is basically a pressure release system used in turbocharged engines take off the load when throttle body gets closed or lifted suddenly. A compressor bypass valve helps to route the pressure generated within a turbo or supercharged engine back into the non-pressurized end of the intake system. On the other hand, a blow off valve releases the air into the atmosphere instead of recirculating it. The main function of the blow off valve is to allow the escape of pressure during the segment of operation when the throttle plate is closed. When the throttle is closed, the relative manifold pressure drops below atmospheric pressure and resulting pressure differential operates the blow off valves piston and excess pressure is vented into atmosphere or recirculated into upstream of the compressor. Without the presence of the valve to allow the pressure to be rerouted, the pressurized air would simply crash into the throttle plate thus building up the pressurized air and eventually be repelled back into the turbo. This strong wave of pressurized air would not only create additional wear on the turbo, but also slow down and possibly stop the action of the turbo altogether.

A blow off valves manages the boost produced by the turbo and is actuated by a diaphragm controlled using a solenoid. When the solenoid receives a signal from ECU to open the valves to bypass the gasses around the exhaust turbine and allows pressure to be maintained in a safe zone. With use, the blow off valves become susceptible to leakage that eventually causes an audible whooshing sound or drop in boost pressure. In state of the art, the blow off valves use a sealing arrangement to prevent leakage. DE 102004044439 B4 relates to a substantially cylindrical valve body having a seal disposed on an end face of the valve body; an actuator for moving the valve body to open and close a passage opening of the valve; a fluid passage formed in the valve body for connecting a rear side of the valve body to a first valve port disposed on the end face of the valve body; and a sealing element for sealing the rear side of the valve body with respect to a second valve connection arranged on a cylinder jacket surface of the valve body, wherein an effective diameter of the sealing element is greater than an effective diameter of the seal of the valve body, wherein the sealing element seals with an open valve on an axial surface of a housing member and a passage open when the valve is open. In cited invention, the use of sealing element requires an excess force to be generated to keep the valve closed.

Therefore, there is a need to develop an air by-pass valve that enables intentional flow of air for maintaining the pressure inside the valve. OBJECT OF THE INVENTION

The main object of the present invention is to provide an improved air by-pass valve with stagnant or internally static flow limiter to improve the leakage.

Another object of the present invention is to provide improved air by-pass valve with an internal static flow limiter with reduced complexity. Still another object of the present invention is to provide a cost-effective improved air by pass valve with reduced number of components required.

SUMMARY OF THE INVENTION

The present invention provides an improved air by-pass valve. More particularly, the present invention provides an improved blow off valve with a stagnant i.e. internally static flow limiter.

In a main embodiment, the present invention provides an improved air by-pass valve comprising of a plunger body, a compression spring, a moving core, a fix core, a bobbin, a coil winding, a coil housing, a valve housing, a sealing ring and a plurality of terminal pins. The sealing ring works as a flow limiter instead of a sealing element to maintain the pressure inside the improved air by-pass valve. The sealing ring works axially and compensates the dimensional flexibility of the improved air by-pass valve. Further, the sealing ring is fixed at one place such that it is stagnant or static. The sealing ring is fixed on plunger internal sealing area.

Here, the improved air by-pass valve reduces the complexity as reduced number of components are used. The sealing rubber provides a flow path on the plunger internal sealing area of a predefined dimension and flow amount. BRIEF DESCRIPTION OF THE DRAWINGS

A complete understanding of the device and method of the present invention may be obtained by reference to the following drawing:

Fig. 1 is a cross sectional view of the improved air by-pass valve in accordance with the present invention. Fig. 2 shows an enlarged sectional view of the bottom portion of the improved air by pass valve in accordance with the present invention.

Fig. 3 shows a sectional view of the plunger body in accordance with the present invention.

Fig. 4 shows an enlarged sectional view of the bottom portion of an air by-pass valve in accordance with a prior art.

DETAILED DESCRIPTION OF THE INVENTION

Many aspects of the invention can be better understood with references made to the drawings below. The components in the drawings are not necessarily drawn to scale. Instead, emphasis is placed upon clearly illustrating the components of the present invention. Moreover, like reference numerals designate corresponding parts through the several views in the drawings. Before explaining at least one embodiment of the invention, it is to be understood that the embodiments of the invention are not limited in their application to the details of construction and to the arrangement of the components set forth in the following description or illustrated in the drawings. The embodiments of the invention are capable of being practiced and carried out in various ways. In addition, the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting.

The present invention provides an improved air by-pass valve. More particularly, the present invention provides an improved blow off valve with a stagnant i.e. internally static flow limiter.

In a main embodiment, the present invention provides an improved air by-pass valve comprising of a plunger body, a compression spring, a moving core, a fix core, a bobbin, a coil winding, a coil housing, a valve housing, a sealing ring and a plurality of terminal pins. The sealing ring works as a flow limiter instead of a sealing element to maintain the pressure inside the improved air by-pass valve. The sealing ring works axially and compensate the dimensional flexibility of the improved air by-pass valve. Further, the sealing ring is fixed at one place such that it is stagnant or static. The sealing ring is fixed on plunger internal sealing area.

Here, the improved air by-pass valve reduces the complexity as reduced number of components are used. The sealing rubber provides a flow path on the internal plunger sealing area of a predefined dimension and flow amount.

Now referring to Fig. 1, a cross-sectional view of the improved air by-pass valve in accordance with the present invention is shown. Said improved air by pass valve (1) comprises of a plunger body (2) which is having one to four cut outs (20) to allow the limited air flow i.e. 0.5 1pm to 5.0 1pm air flow, a compression spring (3), a moving core (4), a fix core (5), a bobbin (6), a coil winding (7), a coil housing (8), a valve housing (9), a sealing ring (10), a fix core insert (11), a guiding pin (12) and a plurality of terminal pins (13). The improved air by-pass valve (1) when energized pulls the moving core (4) and the plunger body (2) upwards and through the cut outs (20) a limited air flow takes place. The sealing ring (10) is preferably made of rubber and fixed on the internal plunger sealing area including valve housing (9), plunger body (2), adjusting/guiding pin (12), compression spring (3) and moving core (4). Guiding pin (12) is assembled with fix core (5) to guide the moving core (4) and it gets inserted into a central groove in the moving core (4). The guiding pin (12) is a cylindrical rod with a round head. The sealing depth of the improved air by-pass valve has a dimensional flexibility and the tolerance is in the range of 17±0.3 mm.

In the improved air bypass valve, there is no requirement of a spring seat, a diaphragm and a diaphragm holder, hence has reduced complexity.

Fig. 2 shows an enlarged sectional view of the bottom portion of the improved air by pass valve in accordance with the present invention. In the bottom portion, the improved air by-pass valve comprises a valve housing (9), a sealing ring (10), a plunger body (2), a moving core (4) and a spring (3). The sealing ring (10) is designed such that it acts as a flow limiter instead of sealing element. The plunger body (2) is having one to four cut outs (20) to allow the limited air flow from the air flow path. The sealing ring (10) is made stagnant and a flow path (11) (circled in figure) is provided in the internal plunger area. The flow path has a dimension in range of 0.2 mm - 2.0 mm in length and 0.2 mm - 2.0 mm in width. The allowable flow amount is in the range of 0.51pm to 5 1pm.

Fig. 3 show a perspective view and sectional view of the plunger body respectively in accordance with the present invention. The plunger body (2) has an outward flange (21) with one to four cut outs (20) such that a limited air flow of 0.51pm to 5.01pm air flow is allowed.

Fig. 4 shows an enlarged sectional view of the bottom portion of an air by-pass valve in accordance with a prior art. In a prior art, the bottom portion of the air bypass valve comprises of a diaphragm (16) i.e. sealing element and a corresponding diaphragm holder (14), a plunger body (2), a guiding pin (12), a moving core (4), a valve housing (9), a spring (3) and a spring seat (15). In the prior art, the sealing depth of valve has a dimensional flexibility and the tolerance is in the range of 17±0.15 mm. Hence, in the prior art, the valve requires more components.

Therefore, the improved air bypass valve having an internal stagnant flow limiter with reduced complexity and improved dimensional complexity.

The foregoing description of embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of the invention. The embodiments were chosen and described in order to explain the principals of the invention and its practical application to enable one skilled in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated.