WO2018037366A1

WO2018037366A1 - Sealing plate assembly for turbo dual purge valve

Info

Publication number: WO2018037366A1
Application number: PCT/IB2017/055101
Authority: WO
Inventors: Kabir BHANDARI; Amardip KUMAR; Torsten Gerlich
Original assignee: Padmini Vna Mechatronics Pvt. Ltd.
Priority date: 2016-08-24
Filing date: 2017-08-24
Publication date: 2018-03-01
Also published as: DE112017004192B4; DE112017004192T5

Abstract

The invention provides a for turbo dual purge valve with a novel sealing plate assembly. The sealing plate assembly 111 comprising of sealing rubber 110 having plurality of snap arms 109 and a central hole 113, which enhances the robustness, the cost effectiveness and easy calibration of inner low flow valve via a carrier plate assembly comprising of sealing rubber, inner low flow valve and also acts as an acoustical stopper.

Description

SEALING PLATE ASSEMBLY FOR TURBO DUAL PURGE VALVE

FIELD OF THE INVENTION The invention provides a novel sealing plate for turbo dual purge valve. More specifically, the invention provides a new assembly that improves robustness, cost effectiveness and calibration of the flow path in the inner valve by installing a carrier plate that attaches all rubber sealing areas and the flow path to the inner valve, fitted by snapping on to the magnetic active armature.

BACKGROUND OF THE INVENTION

A Vehicle Evaporative Emission Control (EVAP) system prevents fuel vapours in the fuel tank from escaping into the atmosphere. The primary components of EVAP systems are fuel tank, fuel tank cap. charcoal canister, purge valve, fuel level sensor, and fuel tank pressure sensor. EVAP system traps fuel vapours from the fuel tank and temporarily stores them in the charcoal canister. A charcoal canister stops fuel vapours being released into the atmosphere. The charcoal canister also stores the fuel vapours for future combustion, allowing it to be recycled back into the engine combustion process when needed. Purge valve is one of the main components of the vehicle EVAP system and it precisely controls the amount of fuel vapour that is purged from the charcoal canister to the engine.

Single path purge systems include a single path extending from the purge valve to the intake system. Dual path purge systems include two paths extending from the purge valve to the intake system and the low pressure side of the air intake of the engine. These dual path purge systems are typically used for engine systems that include a boost device, such as a turbocharger, which pressurizes intake air provided to the engine. These dual path systems typically include a boosted path that provides fuel vapour to the intake system upstream from the boost device and a non-boosted path that provides fuel vapour to the intake system downstream from the boost device in naturally aspirated mode.

A typical layout of fuel vapour purging system for turbo charged engines comprises of a T-joint, two check valves and a purge valve, which can be operated in duty cycle mode, supplements purge flow under any operating conditions of the engine. Dual purge systems typically use two check valves. During a first mode of operation, vacuum pressure places the first check valve in an open position and the second check valve in a closed position. In a second mode of operation, pressurized air places the first check valve in a closed position and the second check valve in an open position by vacuum pressure coming either from the pressure sink in front of the compressor stage of the turbocharger or from an additional device like an ejector using a sonic nozzle which converts boosted air into vacuum pressure. A machined sealing edge on the inner armature which seals against the rubber of the outer armature and the inner armature is a machined metal component only, whereas the outer armature is an elastomeric composite part incorporating all required sealing areas of the turbo dual purge valve. The conventional design of moving core sub assembly is presented, whereas the sealing rubber is directly fitted with the moving core without moving core guider. The flow behaviour especially at low-pressure gradients, which are available during boost mode in front of the compressor.: (lOkPa), can be boosted up by using a sonic Laval-nozzle. The requirement for this valve is to allow a high mass flow at low-pressure gradient. In boost mode, the high flow valve has to open a large pressure-impacted cross section, which requires high magnetic forces. However, due to the pressure-impacted across section the best performance is compromised thereby limiting the force available from the solenoid used in the purge valve. Thus, classic high flow valves cannot give the best performance at high-pressure gradients as required during naturally aspirated operation in idle mode of the engine. High tolerances in opening are the consequence. Noise pollution can cause hypertension, high stress levels, tinnitus, hearing loss, sleep disturbances, and other harmful effects. In conventional systems noises were more which affects both health as well as behaviour. Calibration improves the accuracy of the measuring device and accurate measuring devices improve product quality which is a complex process and not accurate in conventional purge systems. So, the drawbacks of conventional purge systems were expensive sealing plate assembly, more noise disturbances and more difficulties were faced in the calibration of inner low flow valve. The prior art illustrates:

US 5083546 provide a two-stage high flow purge valve for an evaporative emission system of a vehicle. The valve body contains two valves for controlling fluid flow through separate parallel flow paths in the valve body. A fast-acting, pulse width modulated solenoid valve responsive to an electrical control signal from the engine control computer precisely controls flow through a low flow path, and a vacuum-responsive valve controls flow through a high flow path in accordance with the level of manifold vacuum at the engine intake. A third valve member is provided to block flow through the high flow path when the engine is off and the manifold vacuum is zero. Means for calibrating both the solenoid valve and the vacuum-responsive valves are also provided;

US 5524593 provides an electropneumatic control valve for regeneration of a fuel absorption element by supply of air to the absorption element includes a valve comprised of a valve seat member (5) and a valve sealing member (4). The valve seat member is displaceable under the action of a pneumatic control section (2B) while the v ave sealing member (4) is displaceable under the control of an electromagnetic control section (2A). The operation of the valve members (4, 5), takes place independently of one another by the respective control sections. During strong suction pressures in connector (11), valve seat member (5) is lowered and during the opening stroke of the v iv e sealing member (4) a minimum opening is provided whereas during low suction pressure at connector (11) the valve seat member (5) is raised and during the opening stroke of the valve sealing member (4) a maximum valve opening is produced. The valve members are slidably and guidably supported in a fixed sleeve (6) provided with calibrated openings (15); and

WO 2001031240 provides a valve assembly and method for regulating a fluid flow and attenuating noise. The valve assembly comprises a body having a passage extending between a first port (25) and a second port (26), a seat (27) defining a portion of the passage, a member (80) movable with respect to the seat, an actuator (42) moving the member from the first configuration to the second configuration, and a damper (84) movable with respect to the actuator and located at a radial gap between the member and the actuator. The member moves generally along an axis between a first configuration prohibiting fluid flow through the seat and a second configuration permitting fluid flow through the seat. The member includes a first portion adapted to sealingly engage the seat in the first configuration, and a second portion extending along the axis between a first section that is distal from the first portion and a second section that is fixed to the first portion. The actuator has an aperture extending along the axis and generally receiving the second portion. The aperture includes a first segment generally guiding movement of the first section, and a second segment generally guiding movement of the second section.

There are citations wherein citations are available that provide different sealing assembly in a purge valve, but there are no citations present for sealing plate in dual purge valve. Therefore, there is a technological gap wherein a method and system of sealing plate assembly for turbo dual purge valve in order to improve robustness, cost effectiveness and easy calibration for inner flow valve.

OBJECT OF THE INVENTION The main object of this invention is to provide a turbo dual purge valve with a novel sealing plate assembly. Yet another object of the present invention is to provide the sealing plate assembly 111 with at least the two sealing areas having at least one rubber element is equipped with three arms with an undercut.

Yet another object of the present invention is to provide the sealing plate assembly 111 with an injection moulded plastic part or stamped sheet metal component.

Yet another object of the present invention is to provide the sealing plate assembly 111 comprising of sealing rubber, inner low flow valve and acoustical stopper. Yet another object of the present invention is to provide a novel sealing plate assembly to improve the robustness.

Yet another object of the present invention is to provide a novel sealing plate assembly that is cost effective.

Yet another object of the present invention is to implement the sealing plate assembly 111 on a turbo dual purge valve assembly with two armatures and two sealing rubber having different flow paths.

Yet another object of the present invention is to provide a method for defining the height of the slit using length of the arms.

Yet another object of the present invention is to provide a method and system for calibrating inner low flow valve for maximum flow through central hole in the plastic carrier.

Yet another object of the present invention is to provide a method and system for easy and efficient way of assembling of a sealing plate.

Yet another object of the present invention is to provide the sealing plate assembly 111 which is independent of magnetic requirements for installation. Yet another object of the present invention is to provide the sealing plate assembly 111 which can be snap fitted to the existing model of the turbo dual purge valve.

SUMMARY OF THE INVENTION

Accordingly, the main embodiment is to provide a turbo dual purge valve with a sealing plate assembly that positively influences the robustness, the cost effectiveness and easy calibration of inner low flow valve via a sealing plate assembly 111 comprises of a sealing rubber 110 having a plurality of snap arms 109 and a central hole 113 said sealing rubber 110 moulded over a moving core guider 103 and snap fitted on the moving core sub assembly 102; and the sealing plate assembly 111 facilitates easy calibration of inner low flow valve. Further the sealing plate assembly 111 inner low flow valves and also acts as an acoustical stopper.

In yet another embodiment, a novel sealing plate comprises of at least two sealing rubber having at least one rubber element equipped with plurality of snap arm having an undercut and a central hole in sealing plate assembly 111. The sealing rubber is moulded over moving core guider this assembly is snap fitted with moving core sub assembly.

In yet another embodiment, a novel sealing plate assembly comprises of a sealing plate assembly 111 comprising of sealing rubber 110 having plurality of snap arms 109 and a central hole 113.

In yet another embodiment the sealing plate assembly 111 is implemented to a turbo dual purge valve by snap-fitting the sealing plate assembly 111 on to the outer armature which is attached with sealing rubber and plastic carrier assembly with two sealing areas in one rubber element equipped with three arms with an undercut which is easily snap fitted with outer armature. Therefore, the armature can be a simple machined metal component, whereas the carrier plate is preferably an injection moulded plastic part or stamped sheet metal component. The sealing plate can be designed independent of magnetic requirements.

In yet another embodiment sealing plate assembly 111 calibrates inner low flow of the valve using the nozzle which is integrated in the central hole of carrier plate wherein turbo purge valve assembly consists of two armatures and two sealing rubber for different flow paths.

Moreover, the invention accomplishes this noise-attenuation without sacrificing valve performance, and the invention further provides improved sealing of the flow path through the valve when the valve is closed.

BRIEF DESCRIPTION OF THE DRAWINGS

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

Figure 1 elucidates the turbo dual purge valve with novel sealing plate and the novel sealing plate assembly;

Figure 2 provides a magnified view of the novel sealing plate and novel sealing plate assembly;

Figure 3 illustrates the exploded view of the turbo dual purge valve; Figure 4 provides a 3D view of the novel sealing plate;

Figure 5 provides the main difference between a conventional turbo dual purge valve and the turbo dual purge valve according to the present invention;

Figure 6A provides the normal aspirated flow through the assembly with sealing plate according to the present invention.

Figure 6B provides the high flow boost mode of the assembly with sealing plate according to the present invention. Figure 7 A provides the normal aspirated flow showing abnormal behaviour of the assembly without sealing plate.

Figure 7B provides the high flow boost mode of the assembly without sealing plate.

DETAILED DESCRIPTION OF THE INVENTION

The present invention will now be described more fully 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.

This invention deals with a turbo dual purge valve with a novel sealing plate assembly which positively influence the robustness, the cost effectiveness and easy calibration of inner low flow valve by attaching all rubber sealing areas, inner low flow valve and acoustical stopper by snapping it to the magnetic active armature.

As shown in Figure 1, elucidates the turbo dual purge valve with novel sealing plate and the novel sealing plate assembly. The main components of the turbo dual purge valve according to the present invention is housing sub assembly 101, moving core sub assembly 102, moving core guider (outer guidance) 103a, moving core guider (inner guidance) 103b, moving core 104, fix core 105, threaded pin 106, inner spring 107, inner moving core 108 and outer spring 112. As shown in Figure 2, provides a magnified view of the novel sealing plate 111 and moving core sub assembly 102.

As shown in Figure 3, illustrates the exploded view of the turbo dual purge valve housing sub assembly 101, moving core sub assembly 102, moving core guider (outer guidance) 103a, moving core guider (inner guidance) 103b, moving core 104, fix core 105, threaded pin 106, inner spring 107, inner moving core 108, sealing plate 111 and outer spring 112.

As shown in Figure 4, provides an isometric view of the novel sealing plate. The sealing plate 111 comprising of sealing rubber 110 having plurality of snap arms 109 and a central hole 113.

As shown in Figure 5, it provides the main difference between a conventional turbo dual purge valve and the turbo dual purge valve according to the present invention. The main difference highlighted in the sealing rubber 110 which is molded over moving core guider 103. After this over moulding, this assembly is snap fitted on to the moving core sub assembly 102.

As shown in Figure 6A, the normal aspirated flow of the assembly with sealing plate.

As shown in Figure 6B, the high flow boost mode of the assembly with sealing plate has substantially higher efficiency.

As shown in Figure 7A, the normal aspirated flow of the assembly without sealing plate has abnormal behaviour.

As shown in Figure 7B, the high flow boost mode of the assembly without sealing plate is disturbed and has substantially higher efficiency. Therefore, the foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.

Claims

CLAIMS We claim:

1. A dual path dual purge valve assembly comprising: a) a housing sub assembly 101 having an inlet 201 and an outlet 202 for purge flow;

b) a fix core 105, having an inner moving core 108 housing at least one inner spring 107 and a moving core sub assembly 102 having a moving core 104 housing at least one outer spring 112 affixed into said housing sub-assembly 101, aligned axially with the fix core 105, at the bottom;

c) a threaded pin 106, inserted in a direction opposite to that of said fix core 105;

and

d) a sealing plate assembly 111 at the moving core sub assembly 102; wherein, the sealing plate assembly 111 comprises of a sealing rubber 110 having a plurality of snap arms 109 and a central hole 113 said sealing rubber 110 molded over a moving core guider 103 and snap fitted on the moving core sub assembly 102; and the sealing plate assembly 111 facilitates easy calibration of inner low flow valve.

2. The assembly as claimed in claim 1 , wherein the sealing plate assembly 111 further acts as an acoustical stopper.

3. The assembly as claimed in claim 1 , wherein the sealing plate enhances robustness.

4. The assembly as claimed in claim 1 , wherein the sealing plate is cost effective.