WO2021224827A1

WO2021224827A1 - Improved bobbin assembly with integrated nozzle assembly

Info

Publication number: WO2021224827A1
Application number: PCT/IB2021/053809
Authority: WO
Inventors: Kabir BHANDARI; Amardip KUMAR; Nitin MANHAS; Tarun Kumar
Original assignee: Padmini Vna Mechatronics Pvt. Ltd.
Priority date: 2020-05-06
Filing date: 2021-05-05
Publication date: 2021-11-11

Abstract

The present invention relates to an improved bobbin assembly with integrated nozzle assembly comprising, a bobbin assembly and a nozzle assembly (2), wherein, the bobbin assembly comprises of a first section that works as a bobbin (1) and a second section acts as the nozzle assembly (2), the nozzle assembly (2) manufactured as integrated part of the bobbin (1) thereby reducing extra steps in assembling process, the bobbin (1) has a bottom end (1a) provided with terminal connection (5) and a top end (1b) integrated with the nozzle assembly (2) the nozzle assembly (2) is made as an integral part of the bobbin (1) with molding process, thus eliminating a requirement of a rubber element for the bobbin assembly, thereby reducing possibilities of leakage.

Description

“IMPROVED BOBBIN ASSEMBLY WITH INTEGRATED NOZZLE

ASSEMBLY”

FIELD OF THE INVENTION

The present invention relates to an improved bobbin assembly with integrated nozzle assembly to provide leakage proof solenoid valve. More particularly, the present invention provides an improved bobbin assembly with integrated nozzle assembly to provide a leakage proof solenoid valve without using natural or synthetic polymer as sealing material that prevents fuel vapors escaping into the atmosphere.

BACKGROUND OF THE INVENTION

A solenoid device is an electromechanical control unit which shuts or allows the fluid flow, when electrically energized or de-energized. It consists of several parts such as but not limited to solenoid coil, bobbin, moving core, core tube, seal body etc. The magnetic coil of the solenoid is arranged radially relative to the axis of the magnet because the flux of the permanent magnet also extends radially relative to the operating axis of the valve plug and through the armature. There are several areas where solenoid valve is useful such as in pneumatic and hydraulic systems to control cylinders or larger industrial valves, automatic irrigation sprinkler systems also use solenoid valves with an automatic controller.

In conventional designs available, the bobbin and nozzle are different parts, generally made from injection molding process separately and then assembled together using rubber sealing in between the bobbin and nozzle assembly in order to prevent leakage of fuel vapors. This process usually requires separate manufacturing of bobbin and nozzle assembly, and assembly of both requires plurality of steps. Such assembled parts may get leakage overtime under different environment conditions. In some working conditions, the fumes can escape from the EVAP (Evaporative Emission Control) system, this can result in escaping the hydrocarbons into the atmosphere and in the system, which is harmful for the environment and fuel system. Leakage in the system can result in fire in the vehicle or like. Patent document CN 1250894 discloses a hydraulic control valve-based control system, mainly to provide a variable duty cycle electrical signal, by a solenoid valve driven by the electromagnetic switch. Wherein, the electromagnetic switch valve is provided comprising a main outer body, a valve seat, the valve element bearing block, the spool, a coil , the carrier; spool end surface of the large-diameter portion has a radial groove, and the projection is formed between two adjacent radial slots; front end support is opened and the valve a core corresponding to the radial groove and the boss and the boss of the radial groove; spool and the support axially overlap and constitute the insertion clearance fit; half-ball and a valve seat constituting one end of a tapered orifice, a valve seat is tapered and the other end of the valve body forms another spherical orifice; radial holes are opened and the valve seat ring oil tank to communicate. The coil by an electrical signal acting control spool as a high frequency reciprocating motion, the working oil pressure port is dynamically controlled. In said patent document, said bobbin and outer body is assembled by press fitting which may have tendency to leakage after some extent in time.

Therefore, there is a need for a reliable technique to reduce leakage in solenoid valves for working long life.

OBJECT OF THE INVENTION The main object of the present invention is to provide an improved bobbin with integrated nozzle assembly to achieve a leak proof solenoid valve.

Another object of the present invention is to provide a leak proof solenoid valve.

Yet another object of the present invention is to provide a bobbin with integrated nozzle assembly with ease of manufacturing and assembly.

SUMMARY OF THE INVENTION

The present invention provides an improved bobbin assembly with integrated nozzle assembly to provide leak proof solenoid valve without using natural or synthetic polymer as sealing material and prevents fuel leakage from EVAP (Evaporative Emission Control System) system. Further in the present invention, the number of steps in manufacturing and assembly of the bobbin and nozzle assembly are reduced as the nozzle assembly is manufactured as integrated part of the bobbin thereby reducing the extra steps in assembly of both.

In a preferred embodiment, the present invention provides a modified bobbin assembly for solenoid valve with integrated nozzle assembly. Said modified bobbin assembly comprises of a first section which acts as a bobbin and a second section which acts as a nozzle assembly, wherein the nozzle assembly and bobbin are manufactured as a single body. The first section has a bottom end provided with terminal connection and a top end integrated with nozzle assembly. The nozzle assembly comprises of at least one nozzle.

Here, the bobbin and nozzle assembly are made of a material including but not limited to natural or synthetic polymer, metal or like. Both bobbin and nozzle assembly may be of same material or different. The nozzle assembly and bobbin are manufactured as a single body by a technique including but not limited to injection molding. Further, the number of nozzles in nozzle assembly includes such as but not limited to one nozzle, two nozzles or three nozzles.

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:

Fig. 1 illustrates a perspective view of the bobbin and nozzle assembly as per the conventional method.

Fig. 2 illustrates a perspective view of the modified bobbin assembly as per the present invention. Fig. 3 illustrates a perspective view of another modified bobbin assembly as per an alternate embodiment of the present invention.

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.

In a preferred embodiment, the present invention provides a modified bobbin assembly for solenoid valve with integrated nozzle assembly. Said modified bobbin assembly comprises of a first section which acts as a bobbin and a second section which acts as a nozzle assembly, wherein the nozzle assembly and bobbin are manufactured as a single body. The first section acting as bobbin has a bottom end provided with terminal connection and a top end integrated with nozzle assembly. The nozzle assembly comprises of at least one nozzle.

Referring to Fig. 1, a perspective view of the bobbin (1) and nozzle assembly (2) shown in a conventional solenoid valve. In the conventional solenoid valve, the bobbin (1) and nozzle assembly (2) are made as two separate parts which are assembled using a rubber material between the bobbin and nozzle assembly. The rubber material due to varying temperature conditions become hard and cause leakage to environment. Due to bobbin (1) and nozzle assembly (2) made as two different parts, there is a need of assembling nozzle assembly (2) over bobbin (1) with a rubber element positioned between both. Referring to Fig. 2, a perspective view of the modified bobbin assembly is shown as per the present invention. The modified bobbin assembly comprises of a first section which acts as a bobbin (1) and a second section which acts as a nozzle assembly (2), wherein the nozzle assembly (2) and bobbin (1) are manufactured as a single body. The bobbin (1) has a bottom end (la) provided with terminal connection (5) and a top end (lb) integrated with nozzle assembly (2). The nozzle assembly (2) is made as an integral part of the said bobbin with molding process and does not require any rubber element for assembly thereby reducing possibilities of leakage.

Referring to Fig. 3, a perspective view of another modified bobbin is shown. The modified bobbin has a first section that acts as a bobbin (1) and a second section that acts as a nozzle assembly (2). Furthermore, the nozzle assembly (2) includes but not limited to one or more nozzles (3, 4).

Therefore, the present invention provides a modified bobbin assembly that comprises of a bobbin integrated with a nozzle assembly formed as a single part thereby eliminating the process of assembling nozzle assembly over bobbin with rubber element between them. Hence, as per requirement of nozzle orientation, the modified bobbin assembly finds application.

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.

Claims

CLAIMS We claim:

1. An improved bobbin assembly with integrated nozzle assembly, comprising: a first section acting as bobbin (1); and a second section acting as nozzle assembly (2); wherein; said nozzle assembly (2) is manufactured as integrated part of said bobbin (1); said bobbin (1) has a botom end (la) provided with a terminal connection (5) and a top end ( lb) integrated with said nozzle assembly (2); said nozzle assembly (2) is made as an integral part of said bobbin (1) through molding thus eliminating a requirement of a rubber element for said bobbin assembly and thereby reducing possibilities of leakage.

2. The improved bobbin assembly with integrated nozzle assembly as claimed in claim 1, wherein said bobbin (1) and nozzle assembly (2) are made of a material including but not limited to natural or synthetic polymer, metal or like.

3. The improved bobbin assembly with integrated nozzle assembly as claimed in claim 1, wherein said nozzle assembly (2) and bobbin (1) are manufactured as a single body by a technique including but not limited to injection molding.

4. The improved bobbin assembly with integrated nozzle assembly as claimed in claim 1, wherein said nozzle assembly (2) includes but not limited to one or more nozzles

(3, 4).