FIELD OF THE INVENTION

The present invention provides an oil control solenoid valve with dual sealing. More particularly, the present invention provides an oil control solenoid valve with dual sealing comprising of a fixed sleeve containing inlet and outlet, a plunger with at least one axial sealing surface and at least one radial sealing surface thus providing the dual sealing.

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.

Leakage in solenoid valves occurs due to many reasons mainly are classified as external and internal leakage. Generally, problems such as, foreign material in the process medium which may trap between the seat and the sealing disc causing seat leakage, leakage due to damaged O-ring, winking through the diaphragm or like occurs. There are various steps taken to reduce such problems. Also working under high pressure generally one type of sealing is not enough like axial or radial, in order to provide better leak proof design both the axial and radial leakage prevention is required.

Patent document US20090057594A1 discloses, a valve body has an annular bottom face and an inner circumferential periphery both defining a seat fitting hole, which is coaxial with a sliding hole. A spool is axially movable in the sliding hole. A seat member has an outer circumferential periphery and axial end surface, which are respectively radially clearance fitted and axially sealed to the inner circumferential periphery and to the annular bottom face respectively define a cylindrical seal portion and an annular seal portion there between.

The seat member has a bleed port for draining fluid from a bleed chamber. The spool has an end surface, which defines a small clearance between the end surface and the seat member when the spool is seated to the seat member for communicating a supply port with the bleed chamber. A valve body having a sliding hole, which axially extends, the valve body having an annular bottom face and an inner circumferential periphery both defining a seat fitting hole, which is substantially coaxial with the sliding hole and greater than the sliding hole in diameter, a spool axially movable in the sliding hole; and a seat member being substantially cylindrical and fitted to the seat fitting hole, the seat member and the spool being configured to there between define a bleed chamber, the seat member having a bleed port being configured to communicate the bleed chamber with a low-pressure component.

Wherein the seat member has an outer circumferential periphery, which is radially clearance fitted to the inner circumferential periphery and there between define a cylindrical first seal portion, the seat member has an axial end surface, which is axially sealed to the annular bottom face and there between define an annular second seal portion, the spool has a spool end surface on a side of the seat member, the spool end surface having a recess, which defines a small clearance between the spool end surface and the seat member when the spool is seated to the seat member, and the small clearance is configured to communicate a supply port with the bleed chamber for supplying fluid from the supply port to the bleed chamber.

In state of the art, it requires a number of extra parts to achieve such sealing effects, which further increases cost. Increasing number of parts to achieve improved sealing at times leads to increasing the overall size of the valves making them bulkier and heavier.

Therefore, there is a need of a reliable technique to reduce leakage in oil control solenoid valves for long working life without increasing number of parts and overall size of the valve.

OBJECT OF THE INVENTION The main object of the present invention is to provide a dual axis sealing in oil control solenoid valve.

Another object of the present invention is to provide a robust design of oil control solenoid valve with dual sealing effect.

SUMMARY OF THE INVENTION

The present invention provides an oil control solenoid oil valve with robust design against leakage providing dual axis sealing method. More specifically, the present invention provides a robust design of oil control solenoid valve with dual axis sealing apparatus, axial sealing in order to close/open the input port and radial sealing in order to close/ open or vice versa capable of enhancing a sealing property between inlet and outlet ports.

In an embodiment of the present invention, the oil control solenoid valve provided comprises of a valve body, a solenoid coil, at least one spring, a moving core, a fix core, an inlet port, an outlet port, a movable plunger, a sleeve, and at least one guide pin; wherein the said plunger is movable and said sleeve is fixed.

In another embodiment of the present invention, the molded body of oil control solenoid valve is having axial hollow space provided for solenoid coil assembly, said solenoid coil assembly further have an axial hollow space for moving core and guide pin, said guide pin is movable part and interlinkage between moving core and plunger, said moving core is mechanical interlinkage between the permanent magnet and plunger through guide pin. As the moving core moves downward, the plunger also moves downward. Sleeve is attached at the bottom end of the oil solenoid valve comprises of inlet port aligned axially to the fixed sleeve and an outlet port on radial surface of said fixed sleeve, during actuation plunger moves downwards and blocks the path of oil movement from inlet to outlet ports by providing dual sealing between plunger and sleeve radially and axially.

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 sectional view of oil control solenoid valve in actuated condition in accordance with the present invention.

Fig. 2 illustrates a sectional view of oil control solenoid valve without actuation in accordance with 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 main embodiment, the present invention provides an oil control solenoid valve with dual axis sealing i.e. axial sealing in order to close/open the input port and radial sealing in order to close/open or vice versa. Said oil control solenoid valve provided comprises of a valve body, a solenoid coil, at least one fix core, a moving core, an inlet port, an outlet port, a movable plunger, a guide pin, a fixed sleeve, and at least one spring. Further, the oil control solenoid valve is having axial hollow space provided for solenoid coil assembly, said solenoid coil assembly further have an axial hollow space for moving core and guide pin, said guide pin is movable part and interlinkage between moving core and plunger, said moving core is mechanical interlinkage between the permanent magnet and plunger through guide pin. As the moving core moves downward, the plunger also moves downward. Sleeve is attached in the bottom of the oil solenoid valve comprises of inlet port aligned axially to the fixed sleeve and an outlet port on radial surface of the said fixed sleeve, during actuation plunger moves down and blocks the path of oil movement from inlet to outlet ports by providing dual sealing between plunger and sleeve radially and axially. Said spring is assembled between fix core and moving core and gets compressed during actuation.

Here, the movable plunger is preferably made of brass to increase the robustness and provide sealing with fixed sleeve both radially and axially when valve is actuated. And, the fixed sleeve containing the inlet port as well as outlet port is preferably made of aluminum. However, the plunger and sleeve may be made using a material including but not limited to a thermoplastic, thermoset, metal or ceramic material.

Fig. 1 shows sectional view of oil control solenoid valve (1) in energized condition comprising, a valve body (2), a solenoid coil (5), a fixed sleeve (11) having axial hollow area is attached on the bottom of the said oil solenoid valve (1). An inlet port (8) is provided on the bottom and an outlet port (9) is provided on radial surface of the fixed sleeve (11). A plunger (7) is inserted in the given axial hollow area in such a way that it is connected with guide pin (6) on the top and supported with a compression spring (10) between the fix core (12) and moving core (4). Said guide pin (6) is movable part and interlinked between moving core (4) and plunger (7). Said moving core (4) is a mechanical interlinkage between the permanent magnet (3) and plunger (7) through guide pin (6). The guide pin (6) is surrounded and passes through the fix core (12). When oil control solenoid valve (1) is energized the said moving core (4) moves downward, the plunger (7) which is attached to said moving core (4) via guide pin (6) also moves downward compressing the spring (10) thus closing both the inlet port (8) and outlet port (9) at the same time. This provides dual axis sealing thereby preventing leakage.

Fig. 2 shows sectional view of oil control solenoid valve (1) in de-energized condition. In a de-energized state, the solenoid valve is in OFF state, and no electric current is provided to the coil of the solenoid, hence the spring (10) restores to its original position moving the movable plunger (7) upwards which opens the inlet port (8) and outlet port (9) at the same time.

Therefore, the present invention provides radial as well as axial sealing utilizing the movable plunger and fixed sleeve in an oil control solenoid valve without increasing the overall size of valve. 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.