FIELD OF THE INVENTION
The present invention relates to an advanced dual spring blow-off valve with fail safe feature. More specifically, the present invention is directed towards an advanced dual spring blow-off valve for turbochargers that works under the fail safe range where the pressure built inside the turbo charger is released due to the excess pressure force overcoming the force applied by the inner spring.
BACKGROUND OF THE INVENTION
A blow off valve also known as dump valve or compressor bypass valve is a type of pressure discharging unit that is present in general turbocharged engines for receiving the load off the turbocharger when the throttle is unexpectedly closed. The turbocharged engines increase internal combustion engine power output through forced induction device by forcing additionally comprised air into the combustion chamber. The blow off valve discharges the air into atmosphere instead of recirculating the air to prevent compressor surge that voluntarily occurs when the throttle is lifted suddenly. When the plate of the throttle on the engine closes along with high speed spinning the flow decreases below the threshold value of the compressor which results in change in pressure across the compressor and collapse of whole system due to usable flow cycles with cyclic noises, to avoid these situations, blow off valves are fitted to maintain the flow.
The blow off valve is assembled with a vacuum hose to intake manifold after the throttle plate and the blow off valve comprise of a main housing that acts a vacuum chamber, a spring, a diaphragm and a valve, in which the diaphragm responds to pressure changes and at a predefined vacuum, it gets dragged towards a vacuum source that compresses the spring present in the housing and the spring is associated to the valve that pulls away from the seat and discharges the extra boost pressure. The relation manifold pressure decreases below the atmospheric presser when the throttle is closed that results in activation of blow off valve’s piston. The additional pressure from the turbocharger is expelled into the atmosphere or circulated back to the intake upstream of the compressor inlet. But some major drawbacks of the blow off valve are does not work in failsafe range, bulky in size, not highly reliable, high response time and the existing blow off valve requires higher voltage to actuate pressure.
CN101636590A discloses about blow-off valve for turbo blower that is blown off to discharged air in the atmosphere in the early stage operational phase of turbo blower, encompassing of a valve guide plate assembled on a barrel portion for covering the head of the plate, a turbo blower, a guiding valve, a blow pressure spool. The drawback of this invention is blow off valve does not work in failsafe condition, moreover this blow off valve is big in size and not highly reliable and does not ensure quick response.
Therefore, there is a need of an advanced dual spring blow-off valve for turbochargers that works under the fail safe range, compact in size and highly reliable, quick response time, movable sealing element helps to maintain the back pressure by equalizing with the input pressure, where the pressure built inside the turbo charger is released due to the excess pressure force overcoming the force applied by the inner spring, that is electrically operated through ECU’s signal within the limits and operates autonomously when discarded boost pressure is reached in turbo charger.
OBJECT OF THE INVENTION
The main object of the present invention is to provide an advanced dual spring blow-off valve with fail safe working feature in which pressure built inside the turbo charger is released due to the excess pressure force overcoming the force applied by the spring.

Another object of the present invention is to provide an advanced dual spring blow-off valve with fail safe working feature that compact in size and highly reliable.
Yet another object of the present invention is to provide an advanced dual spring blow-off valve with fail safe working feature that is electrically operated through ECU’s signal within the limits and operates autonomously when discarded boost pressure is reached in turbo charger.
Yet another object of the present invention is to provide an advanced dual spring blow-off valve with fail safe working feature with a movable inner sealing element helps to maintain the back pressure by equalizing with the input pressure.
Still another object of the present invention is to provide an advanced dual spring blow-off valve with fail safe working feature with quick response time in which the actuation time of the valve is reduced due to the assistance provided by the input air’s force.
SUMMARY OF THE INVENTION
The present invention relates to an advanced dual spring blow-off valve with fail safe working feature that is electrically operated through ECU’s signal within the limits and activates autonomously when unwanted boost pressure is reached in turbo charger, comprise of a movable inner sealing element helps to maintain the back pressure by equalizing with the input pressure and ensures fast response time in which the actuation time of the valve is reduced due to the assistance provided by the input air’s force.
In an embodiment, the present invention provides an advanced dual spring blow-off valve with fail safe working feature, comprising of a housing sub assembly with solenoid, an inner seal, an outer sealing element, an inner spring a sealing ring and an outer spring wherein said advanced dual spring blow-off valve includes a movable inner sealing element and is electrically operated according to ECU’s signal received within the limits and operates autonomously when boost pressure crosses a threshold value in turbo charger, said movable inner sealing element helps to maintain the back pressure by equalizing with the input pressure and actuation time of the advanced dual spring blow-off valve is reduced due to the assistance provided by the input air’s force, additionally a small amount movement of the inner sealing makes the stroke length short, giving a lesser delay in the response time for the advanced dual spring blow-off valve to open up, thereby achieving quick response time that makes the advanced dual spring blow-off valve efficient and highly reliable.
In an embodiment, the present invention provides an advanced dual spring blow-off valve with fail safe working feature in which the advanced dual spring blow-off valve is a normally close valve type in which the opening controlled by the solenoid. The pressure at the input equalizes with the pressure behind the outer sealing element at OFF condition. As the movable inner sealing element is pulled back letting off all the built up pressure due to which the advanced dual spring blow-off valve lifts up and liberates the air. In case where the input pressure rises to the level higher than the threshold value i.e. OEM specified limits, the advanced dual spring blow-off valve starts lifting autonomously in response to avoid a situation where the pressure built by turbo charger exceeds accidentally creating turbulent air flow. The movement of the outer sealing element surface takes place due to the force of the input pressure applying on it. The actuated solenoid through the ECU’s signal open up the movable inner sealing element lower the back pressure by letting the air flow, due to which the force of the input air lifts the outer sealing element. The small movement of the inner sealing makes the stroke length for this change extremely short, resulting in a lesser delay in the response time for the advanced dual spring blow-off valve to open up.
The present invention provides an advanced dual spring blow-off valve with fail safe working feature in which smaller size components are used to reduce the size of the overall assembled production. The quick responsive nature of the advanced dual spring blow-off valve also enhance the parent turbo charger output performance with providing no lag in its response. The size of the movable inner sealing element is compact and the energy required (electromechanical force during actuation) is also reduced.
The above objects and advantages of the present invention will become apparent from the hereinafter set forth brief description of the drawings, detailed description of the invention, and claims appended herewith.
BRIEF DESCRIPTION OF THE DRAWINGS
An understanding of the advanced dual spring blow-off valve of the present invention may be obtained by reference to the following drawing:
Fig. 1 is a cross-sectional view of the advanced dual spring blow-off valve with fail safe working feature according to an embodiment of the present invention.
Figs. 2 and 3 are perspective views of the advanced dual spring blow-off valve with fail safe working feature according to an embodiment of the present invention.
Fig. 4 is a block diagram of the advanced dual spring blow-off valve with fail safe working feature along with function according to an embodiment of the present invention.
Fig. 5 is a graphical representation depicting autonomous behavior of the advanced dual spring blow-off valve under fail safe conditions.
DETAILED DESCRIPTION OF THE INVENTION
The present invention will now be described hereinafter with reference to the accompanying drawings in which a preferred embodiment of the invention is shown. This invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiment set forth herein. Rather, the embodiment is provided so that this disclosure will be thorough, and will fully convey the scope of the invention to those skilled in the art.
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 advanced dual spring blow-off valve with fail safe working feature in which smaller size components are used for reducing the size of the overall assembled production with a quick responsive that enhances the parent turbo charger output performance with providing no lag in response.
Referring to Fig. 1 in an embodiment, the present invention provides an advanced dual spring blow-off valve (100) with fail safe working feature, comprising of a housing sub assembly (1) with solenoid, an inner seal (3), an outer sealing element (4), an inner spring (5), a sealing ring (6) and an outer spring (7), wherein said advanced dual spring blow-off valve (100) includes a movable inner sealing element (2) and is electrically operated according to ECU’s signal received within the limits and operates mechanically when boost pressure crosses a threshold value in turbo charger, said movable inner sealing element (2) helps to maintain the back pressure by equalizing with the input pressure and actuation time of the advanced dual spring blow-off valve (100) is reduced due to the assistance provided by the input air’s force, thereby achieving quick response time that makes the advanced dual spring blow-off valve (100) efficient and highly reliable. Additionally, the back pressure is the applying force on the outer sealing element (4) that is being accomplished due to the moveable inner sealing element (2).
Referring to Figs. 2 and 3 and in another embodiment, the present invention provides an advanced dual spring blow-off valve (100) with fail safe working feature in which the advanced dual spring blow-off valve (100) is a normally close valve type in which the opening controlled by the solenoid. The pressure at the input equalizes with the pressure behind the outer sealing (4) element at OFF condition (refer to Fig. 2). The force due to pressure acting from behind on the outer sealing element (4) is depicted by F1, whereas the for force due to pressure acting at the inlet is depicted by F2 and in OFF condition F2 is greater than F1. As the movable inner sealing element (2) is pulled back letting off all the built up pressure due to which the advanced dual spring blow-off valve (100) lifts up and liberates the air. In ON condition, F1 is greater than F2 (refer to Fig. 3).
In case where the input pressure rises to the level higher than the threshold value i.e. OEM specified limits, the advanced dual spring blow-off valve (100) starts lifting autonomously in response to avoid a situation where the pressure built by turbo charger exceeds accidentally creating turbulent air flow. The movement of the outer sealing element (4) surface takes place due to the force of the input pressure applying on it. The actuated solenoid through the ECU’s signal open up the movable inner sealing element (2) lower the back pressure by letting the air flow, due to which the force of the input air lifts the outer sealing element (4). The small movement of the inner sealing makes the stroke length for this change extremely short, resulting in a lesser delay in the response time for the advanced dual spring blow-off valve (100) to open up.
Referring to Fig. 4 a block diagram of the advanced dual spring blow-off valve with fail safe working feature along with function is illustrated. The advanced dual spring blow-off valve (100) with fail safe working feature uses smaller size components to reduce the size of the overall assembled production. The quick responsive nature of the advanced dual spring blow-off valve (100) also enhance the parent turbo charger output performance with providing no lag in its response. The size of the movable inner sealing element (2) is compact and the energy (electromechanical force during actuation) required also reduced.

EXAMPLE 1
Experimentation data
The present invention provides an advanced dual spring blow-off valve (100) with fail safe working feature which works under the safe limit of the turbo charger’s operation and further increase the input pressure, during which the actuation is assisted by the force of the input pressure that makes the advanced dual spring blow-off valve (100) fail safe under circumstances where the pressure built inside the turbo charger is released due to the excess pressure force overcoming the force applied by the spring, moreover the performance is increased by tuning the turbo charger to higher operation levels as depicted in Fig. 5 in which P1 is pressure determined accordingly to OEM requirement and calibration, P2 is pressure till where advanced dual spring blow-off valve (100) operates autonomously under safe bar, P3 is pressure for turbo charger’s safe operation and point 1 represents where the design operates as determined by the OEM requirement & calibrations, point 2 represents the safe bar for the advanced dual spring blow-off valve (100) to operate autonomously and point 3 represents the limits for the turbo charger safe operations.
Therefore, the present invention provides an advanced dual spring blow-off valve with fail safe working feature that works under the safe limit of the turbo charger’s operation in which smaller size components are used to diminish the size of the overall assembled production. The swift responsive nature of the advanced dual spring blow-off valve also boosts the parent turbo charger output performance with providing no lag in its response. The size of the movable inner sealing is compact and the energy required is also reduced.
Many modifications and other embodiments of the invention set forth herein will readily occur to one skilled in the art to which the invention pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the invention is not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

CLAIMS

We claim:
1. An advanced dual spring blow-off valve (100), comprising:

a housing sub assembly (1) with a solenoid;
an inner seal (3);
an outer sealing element (4);
an inner spring (5);
a sealing ring (6); and
an outer spring (7);
wherein,
said advanced dual spring blow-off valve (100) is configured with an electronic control unit, includes a movable inner sealing element (2) and said advanced dual spring blow-off valve (100) operates according to a signal provided by said electronic control unit when the pressure crosses a threshold value, thereby making said advanced dual spring blow-off valve (100) fail safe; and
said movable inner sealing element (2) maintains a back pressure by equalizing with an input pressure and actuation time of said advanced dual spring blow-off valve (100) is reduced due to an assistance provided by the force of input air to achieve a quick response time.

2. The advanced dual spring blow-off valve (100) as claimed in claim 1, wherein said advanced dual spring blow-off valve (100) is electrically operated.

3. The advanced dual spring blow-off valve (100) as claimed in claim 1, wherein said pressure is built in a turbo charger.
4. The advanced dual spring blow-off valve (100) as claimed in claim 1, wherein said back pressure refers to the force acting on said outer sealing element (4).

5. The advanced dual spring blow-off valve (100) as claimed in claim 1, wherein said advanced dual spring blow-off valve works efficiently under said input pressure ranging from 4.0 to 5.0 Bar which makes said advanced dual spring blow-off valve (100) fail safe.

6. The advanced dual spring blow-off valve (100) as claimed in claim 1, wherein said advanced dual spring blow-off valve (100) is preferably a close valve.

7. The advanced dual spring blow-off valve (100) as claimed in claim 1, wherein said advanced dual spring blow-off valve (100) starts lifting autonomously when the input pressure rises to a level higher than the threshold value.