KR101907896B1 - Solenoid valve for regulator - Google Patents

Abstract

A solenoid valve for a regulator, comprising: a body coupled to a body of a regulator; a sleeve coupled to an upper portion of the body and having a plunger lifting space therein; and a sleeve coupled to an upper portion of the body and the sleeve, And a solenoid for opening and closing an orifice formed in the body, wherein a coupling rib formed on an upper portion of the body and a sleeve are fitted to each other in a fitting manner, thereby simplifying the manufacturing process of the solenoid valve, It is possible to prevent the intermittent latching phenomenon during the ascending and descending operation of the main body 1, thereby improving durability and high-speed responsiveness.

Description

SOLENOID VALVE FOR REGULATOR "

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for a regulator, and more particularly, to a regulator solenoid valve that is electronically opened and closed by a regulator for reducing a pressure of a high-pressure gas fuel.

The regulator is applied to vehicles using high pressure gaseous fuels such as compressed hydrogen gas or compressed natural gas (hereinafter, referred to as 'natural gas'), and the high pressure fuel pressure To a predetermined pressure and supplies the reduced pressure to the outlet side.

The present applicant has filed and filed a patent for a fuel pressure reducing regulator which is applied to a natural gas vehicle in many cases, such as Patent Document 1 and Patent Document 2, and which performs a two-stage fuel pressure reduction.

A conventional two-stage pressure reducing regulator is provided between a fuel tank and a fuel injector. The two-stage pressure reducing regulator includes a first pressure reducing unit for first reducing a fuel pressure of about 100 bar or more to a pressure of about 20 bar, And a secondary pressure-reducing section for performing secondary pressure reduction at a pressure of 5 to 10 bar.

A solenoid valve driven by a control signal of an electronic control unit according to the running condition of the vehicle is applied to the secondary pressure reducing portion.

For example, Figs. 1 and 2 are block diagrams of a solenoid valve for a regulator according to the related art.

1 (a) and 1 (b) show a state in which the body 3 and the sleeve 4, in which the plunger 1 and the shaft 2 are provided, respectively, are detachably provided and the body 3 and the sleeve 4, And the core 5 are assembled to each other and then welded together.

Therefore, the solenoid valve shown in FIG. 1 has a problem that the inner diameter dimension of the solenoid valve is deformed by shrinkage of the body 3 and the sleeve 40 due to the heat applied during the welding operation after assembly.

2 (a) to 2 (c), a solenoid valve is shown in which the body 3 and the sleeve 4 are integrally formed to prevent welding work after assembly to prevent dimensional deformation.

Korean Patent Registration No. 10-1045519 (issued on June 30, 2011) Korean Patent Registration No. 10-1271408 (Announcement on June 5, 2013)

However, since the solenoid valve shown in Fig. 2 has a structure in which the internal rigidity is lowered by integrally forming the body 3 and the sleeve 4, and the guide 6 is press-fitted into the lower portion of the body 3, There is a problem that the assembling property is deteriorated.

On the other hand, the solenoid valve for a regulator according to the related art has a problem that intermittent engagement occurs due to tolerance of the guide portion and shaft twist during opening operation.

Particularly, as shown in FIG. 1, when the body and the sleeve are welded together, the intermittent engagement phenomenon is further accelerated due to the deformation of the inner diameter of the body and the sleeve.

Therefore, a high-speed response of about 500 Hz to 2000 Hz is required due to the characteristics of the secondary pressure-reducing portion to which the solenoid valve is applied. However, the problem of durability due to the intermittent catching phenomenon and the pulsation phenomenon of the secondary outlet pressure There is a problem that causes the same performance degradation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a solenoid valve for a regulator that simplifies an assembly structure of a solenoid valve applied to a regulator for reducing pressure of high-pressure gaseous fuel and can prevent deformation.

It is another object of the present invention to provide a regulator solenoid valve capable of preventing intermittent jamming during operation and improving the operating frequency performance and durability.

It is still another object of the present invention to provide a solenoid valve for a regulator that can improve assembling performance and high-speed responsiveness during operation.

In order to achieve the above object, a solenoid valve for a regulator according to the present invention includes a body coupled to a body of a regulator, a sleeve coupled to an upper portion of the body and having a plunger lifting space therein, And a solenoid which is coupled to an upper portion of the sleeve and opens and closes the orifice formed in the body to reduce the pressure of the gaseous fuel, and the coupling rib and the sleeve formed on the body are coupled by a fitting method.

The body is formed with a cylindrical space in which a shaft of the solenoid is installed so as to be able to ascend and descend, a fuel inlet through which gas fuel flows is formed at a lower portion of the body, And an orifice communicating with the fuel inlet and reducing the pressure of the gaseous fuel is formed.

The upper surface of the body is provided with an engaging rib provided with a space for the plunger therein. An outer surface of the upper end of the body is formed with a seating flange on which a flange formed on the lower end of the sleeve is seated. And an installation groove in which an O-ring is hermetically sealed between the flange and the mounting flange is formed.

The sleeve is made of a non-magnetic material and is formed into a cylindrical shape with an open bottom. The sleeve is coupled between the body and the core of the solenoid, guides the lifting operation of the plunger and the shaft, And an upper portion of the sleeve is provided with a projection protruding upward to provide a space for the shaft to move up and down, and an intermediate portion of the sleeve is provided at an upper end of a coupling rib of the body, A stepped step is formed so as to be engaged with the stepped portion.

The solenoid includes a case coupled to an upper portion of the body and the sleeve, a bobbin provided in an inner space of the case and having a coil on an outer circumferential surface thereof, a bobbin disposed inside the sleeve, A plunger, a spring for providing a restoring force to the plunger, a shaft installed inside the plunger and moving up and down together with the plunger to open and close the orifice of the body, and a plunger, And a lower end of the core is formed to be tapered so as to have a smaller diameter toward the lower end.

The case includes a cylindrical body formed in a cylindrical shape, first and second disc members shielding the upper and lower surfaces of the cylindrical body, and the upper end of the core is passed through the first disc member of the case, A thread is formed on an outer circumferential surface of the fastening protrusion so as to fasten the nut for fixing the core and the case, and the joint between the upper surface of the first disc member and the fastening protrusion and the nut is caulked .

The case includes a cylindrical body formed in a cylindrical shape, first and second disc members shielding the upper and lower surfaces of the cylindrical body, and upper and lower ends of the cylindrical body are respectively connected to first and second circular plates And the bobbin, the sleeve, and the body, which are disposed between the members, are simultaneously bent at an angle.

As described above, according to the solenoid valve for a regulator according to the present invention, the manufacturing process of the solenoid valve is simplified to improve the assembling property, and the intermittent jamming phenomenon during the lifting operation of the plunger is prevented to improve the durability and high- Can be obtained.

In other words, according to the present invention, by combining the body and the sleeve in a fitting manner, it is possible to eliminate the welding operation and to prevent the intermittent latching phenomenon occurring during the lifting operation of the plunger due to the dimensional deformation.

As a result, according to the present invention, it is possible to prevent the plunger and the shaft from being unevenly worn by removing the intermittent latching phenomenon during the lifting operation of the plunger, to reduce the pulsation of the secondary outlet pressure and to improve the operation performance of the regulator, The durability of the parts can be improved.

According to the present invention, by manufacturing the sleeve in a press method using a material of a non-magnetic material, it is possible to improve the suction force and simplify the manufacturing process, thereby improving the workability in the manufacturing work.

According to the present invention, the lower end portion of the core is tapered, and the upper portion of the sleeve is engaged with the lower surface of the core to guide the lifting operation of the plunger and the shaft.

Thus, according to the present invention, the effect that the high-speed response performance can be further improved by the gap between the plunger and the sleeve in the course of the plunger moving up and down at a high speed by the operating frequency of about 500 Hz to 2000 Hz .

Further, according to the present invention, since the suction force is maintained proportionally using the tapered structure of the core, the effect of reducing the pulsation of the decompressed gaseous fuel and stably maintaining the pressure of the reduced pressure in the second depressurization portion .

Further, according to the present invention, the upper and lower ends of the cylindrical body of the case are each bent at an angle, and the solenoid, the sleeve, and the body are fixed by a curling method, whereby the assembling structure can be simplified and the assembling performance can be improved.

FIG. 1 and FIG. 2 are block diagrams of a solenoid valve for a regulator according to the prior art,
3 is a perspective view of a solenoid valve for a regulator according to a preferred embodiment of the present invention,
4 is a cross-sectional view taken along the line A-A 'shown in Fig. 3,
5 is an exploded perspective view of the body and the sleeve,
6 is a sectional view of a solenoid valve for a regulator according to another embodiment of the present invention.

Hereinafter, a solenoid valve for a regulator according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a perspective view of a solenoid valve for a regulator according to a preferred embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along the line A-A 'shown in FIG.

Hereinafter, terms indicating directions such as 'left', 'right', 'forward', 'rearward', 'upward' and 'downward' are defined as indicating respective directions based on the states shown in the respective drawings do.

The configuration of the solenoid valve applied to the second depressurizing portion of the regulator will be described in this embodiment.

However, it should be noted that the present invention is not necessarily limited thereto, but may be applied to various devices to which a solenoid valve is applied in addition to the first pressure reducing portion and the regulator of the regulator.

3 and 4, a solenoid valve 10 for a regulator according to a preferred embodiment of the present invention includes a body 20 coupled to a body of a regulator (not shown) A sleeve 30 which is coupled to the plunger 44 and provided with a lifting space for the plunger 44 and an orifice 22 formed on the body 20 to be connected to the upper portion of the body 20 and the sleeve 30, And a solenoid 40 which opens and closes the solenoid 40.

The body 20 may be installed in a second depressurization portion for depressurizing the gaseous fuel which has been firstly reduced in the first depressurization portion provided in the regulator to a predetermined pressure.

The body 20 is formed in a substantially cylindrical shape with an installation space in which the shaft 46 of the solenoid 40 is installed and a fuel inlet 21 through which the gaseous fuel flows is formed in the lower end side surface of the body 20 .

At the lower end of the body 20, an orifice 22 communicating with the installation space and the fuel inlet 21 and reducing the pressure of the gaseous fuel may be formed.

A flange 32 formed at the lower end of the sleeve 30 is formed on the outer circumferential surface of the upper end of the body 20 and a flange 32 formed on the lower end of the flange 32 is formed on the upper surface of the body 20, A mounting flange 24 can be formed.

An installation groove 25 may be formed on the upper surface of the seating flange 24 to provide an airtight seal between the flange 32 and the seating flange 24.

The sleeve 30 is coupled between the body 20 and the core 47 of the solenoid 40 and serves to guide the lifting operation of the plunger 44 and the shaft 46.

The sleeve 30 is formed in a substantially cylindrical shape with an opening at the bottom and an idle space in which the plunger 44 and the shaft 46 move up and down can be provided in the sleeve 30.

Here, a protrusion 31 having a space in which the shaft 46 can move up and down may be formed on the upper portion of the sleeve 30 to protrude upward.

A generally ring-shaped flange 32 may be formed on the lower end of the sleeve 30 so as to be seated on a seating flange 24 formed on the outer circumferential surface of the body 20.

A stepped step 33 may be formed at an intermediate portion of the sleeve 30 so as to be hooked on the upper end of the coupling rib 23 of the body 20.

5 is an exploded perspective view of the body and the sleeve.

5, the engaging rib 23 at the upper end of the body 20 is inserted into the inner space of the sleeve 30, instead of the forced engagement method in which the body 20 and the sleeve 30 are press- And can be combined in a fitting manner.

To this end, the engagement ribs 23 may be formed with an outer diameter equal to the inner diameter of the sleeve 30 or slightly smaller than the inner diameter of the sleeve 30.

As described above, according to the present invention, by fitting the body and the sleeve in a fitting manner, it is possible to eliminate the welding operation and to prevent the intermittent latching occurring during the lifting operation of the plunger due to the dimensional deformation.

Therefore, it is possible to prevent uneven wear of the plunger and the shaft, reduce the pulsation of the secondary outlet pressure, and improve the operating performance of the regulator and the performance of each component applied to the solenoid valve by eliminating the intermittent latching phenomenon during the lifting operation of the plunger. Durability can be improved.

Further, the present invention can improve the workability in the manufacturing work by improving the suction force and simplifying the manufacturing process by manufacturing the sleeve in a press method using a material of non-magnetic material.

3 and 4, the solenoid 40 includes a case 41 coupled to the upper portion of the body 20 and the sleeve 30, a case 41 disposed in the inner space of the case 41, A plunger 44 which is disposed inside the sleeve 30 and moves up and down in the up and down direction by an electromagnetic force generated by the coil 42; a spring 45 that provides a restoring force to the plunger 44; A shaft 46 which is provided inside the plunger 44 and moves up and down together with the plunger 44 to open and close the orifice 22 of the body 20 and a plunger 44 And a core 47 spaced apart by a distance that is operative.

The case 41 is formed in a cylindrical shape with an opened lower surface and a connector 48 is provided at an upper end of the case 41 to receive a control signal and power supplied from the electronic control unit.

The case 41 may include a cylindrical body 411 formed in a cylindrical shape and first and second circular plate members 412 and 413 for covering the upper and lower surfaces of the cylindrical body 411.

A through hole may be formed at the center of the first circular plate member 412 so that a fastening protrusion 472 formed on an upper surface of the core 47 is inserted and coupled therewith.

The second circular plate member 412 is formed at a central portion thereof with a coupling hole to which the sleeve 30 is coupled and the second circular plate member 412 can be seated on the upper surface of the flange 32 of the sleeve 30.

The coil 42 is wound on the outer circumferential surface of the bobbin 43 a plurality of times and generates an electromagnetic force in accordance with a control signal of the electronic control unit transmitted through the connector 48.

When the electromagnetic force is generated by supplying power to the coil 42, the plunger 44 moves upward while elastically deforming the spring 45 inserted from above into the insertion groove 441 formed in the plunger 44.

When the power supplied to the coil 42 is cut off, the electromagnetic force is removed, and the plunger 44 descends due to the restoring force of the spring 45 and the pressure of the gaseous fuel introduced through the fuel inlet 21, Lt; / RTI >

Of course, the plunger 44 can move up and down in the opposite direction in accordance with the winding direction of the coil 42 or the direction of the current applied to the coil 42.

The shaft 46 is coupled to the central portion of the plunger 44 and can be moved up and down by the lifting operation of the plunger 44 to open and close the orifice 22. [

The lower end of the shaft 46 is formed to have a larger diameter than the inner diameter of the orifice 22 and is inserted into the upper end of the orifice 22 during the lowering operation to completely close the orifice 22, As shown in Fig.

The core 47 is formed in a substantially cylindrical shape having a circular section and a coupling groove 471 for coupling the upper portion of the sleeve 30 and the protrusion 31 is formed on the lower surface of the core 47.

A fastening protrusion 472 is formed at the upper end of the core 47 to protrude from the upper portion of the case 41 through the upper surface of the case 41. A nut 473 can be fastened to the outer circumferential surface of the fastening protrusion 472 A thread can be formed.

Here, the joint between the upper surface of the first circular plate member 412 of the case 41 and the fastening protrusion 472 and the nut 473 can be caulked.

The lower end of the core 47 may be tapered to have a smaller diameter toward the lower end.

As described above, according to the present invention, the lower end portion of the core is tapered, and the upper portion of the sleeve is engaged with the lower surface of the core to guide the lifting operation of the plunger and the shaft.

Accordingly, the present invention can further improve the high-speed response performance by the gap between the plunger and the sleeve in the course of the plunger moving up and down at a high speed by the operating frequency of about 500 Hz to 2000 Hz.

Further, according to the present invention, since the suction force is maintained proportionally by using the tapered structure of the core, the pulsation of the decompressed gaseous fuel can be reduced to stably maintain the pressure of the fuel depressurized in the second depressurization portion.

In the present embodiment, the fastening protrusion 472 is formed on the upper end of the core 47, the nut 473 is fastened to the outside of the case 41 and caulked to fix the core 47 and the case 41 The present invention is not limited thereto.

6 is a cross-sectional view of a solenoid valve for a regulator according to another embodiment of the present invention.

The regulator solenoid valve 10 according to the present embodiment is similar to the solenoid valve 10 described with reference to Fig. 4 as shown in Fig. 6 except that the fastening protrusion 472 of the core 47 and the nut The upper and lower ends of the cylindrical body 411 of the case 41 are each bent at an angle to be oblique by a predetermined angle so that the bobbin 412, The sleeve 30, and the seating flange 24 of the body 20 can be fixed at the same time.

As described above, according to the present invention, the upper and lower ends of the cylindrical body of the case are each bent in an inclined manner, and the solenoid, the sleeve, and the body are fixed by the curling method.

Next, a coupling relationship and a method of operation of a regulator solenoid valve according to a preferred embodiment of the present invention will be described in detail.

The operator inserts the core 47 into the cylindrical body 411 of the case 41 by installing the core 47 inside the bobbin 43 having the coil 42 wrapped around the outer periphery.

At this time, the fastening protrusion 472 formed on the upper end of the core 47 protrudes upward through the first disc member 412 of the case 41, and the nut 473 is fastened to the fastening protrusion 472 , The core 47 and the case 41 are fixed.

Here, the joint between the upper surface of the case 41 and the fastening protrusion 472 and the nut 473 can be caulked.

The upper end of the sleeve 30 is engaged with the engaging groove 471 formed in the lower surface of the core 47. The engaging groove 471 is formed in the upper surface of the sleeve 47, Lt; / RTI >

The operator then moves the body 20 upward in a state where the shaft 46 is inserted into the body 20 so that the lower end of the shaft 46 is disposed in the orifice 22 to move the coupling rib 23 and the sleeve 30) in a fitting manner.

As described above, according to the present invention, it is possible to assemble the body and the sleeve in a fitting manner and to assemble easily compared with the conventional forced fitting method by forced indentation, and to prevent the intermittent jamming The phenomenon can be prevented.

6, the upper and lower ends of the cylindrical body 411 of the case 41 are each bent obliquely to fix the solenoid 40, the sleeve 30 and the body 20 in a curling manner, You may.

The solenoid valve 10 for the regulator is coupled to the second depressurizing portion of the regulator and the plunger 44 and the shaft 46 are moved up and down according to the control signal of the electronic control unit So that the fuel supplied through the fuel inlet 21 is passed through the orifice 22 to be secondarily reduced in pressure.

The lower end of the core 47 is tapered and the sleeve 30 having the upper portion of the sleeve 30 coupled to the lower surface of the core 47 has the plunger 44 and the shaft 46 provided in the up / Thereby guiding the lifting and lowering operation.

Accordingly, the present invention can maintain the high-speed response performance in the process of ascending and descending the plunger at a high speed by an operating frequency of about 500 Hz to 2000 Hz.

Further, the present invention can reduce the pulsation of the decompressed gaseous fuel and stably maintain the pressure of the fuel depressurized in the second depressurization portion.

Through the process as described above, the present invention can simplify the manufacturing process of the solenoid valve to improve the assemblability and prevent intermittent jamming during the lifting operation of the plunger, thereby improving durability and high-speed response.

Although the invention made by the present inventors has been described concretely with reference to the above embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

In the above-described embodiments, the configuration of the solenoid valve applied to the second depressurizing portion of the regulator has been described. However, the present invention can be applied to various devices to which the solenoid valve is applied in addition to the first depressurizing portion and the regulator of the regulator.

INDUSTRIAL APPLICABILITY The present invention is applied to a technique for improving the assemblability by simplifying the manufacturing process of the solenoid valve applied to the regulator and preventing the intermittent jamming phenomenon during the plunger lifting operation, thereby improving durability and high-speed responsiveness.

10: Solenoid valve for regulator
20: Body 21: Fuel Inlet
22: orifice 23:
24: Mounting flange 25: Installation groove
30: Sleeve 31:
32: flange 33: step
40: Solenoid 41: Case
411: Cylindrical body 412, 413: First and second disk members
42: coil 43: bobbin
44: plunger 441: insertion groove
45: spring 46: shaft
47: core 471: engaging groove
472: fastening protrusion 473: nut
48: Connector

Claims (7)

A solenoid valve which is applied to a regulator and opens and closes a flow path in accordance with a control signal of an electronic control unit,
A body coupled to the regulator body,
A sleeve coupled to an upper portion of the body and having a plunger lifting /
And a solenoid which is coupled to an upper portion of the body and the sleeve and opens and closes the orifice formed in the body to discharge the gaseous fuel under reduced pressure,
The engagement rib and the sleeve formed on the upper portion of the body may be formed to have an outer diameter equal to the inner diameter of the sleeve or smaller than the inner diameter of the sleeve so as to prevent the engagement of the plunger on the solenoid during lifting operation, And a solenoid valve for regulator. The method according to claim 1,
Wherein the body is provided with an installation space in which a shaft of the solenoid is installed so as to be able to ascend and descend,
A fuel inlet through which the gaseous fuel flows is formed at a lower portion of the body,
And an orifice for communicating with the installation space and the fuel inlet and for reducing the pressure of the gaseous fuel is formed at the lower end of the body. 3. The method of claim 2,
Wherein an engaging rib protrudes from an upper surface of the body, the engaging rib having a space in which the plunger is installed,
A seating flange on which a flange formed at a lower end of the sleeve is seated is formed on an outer peripheral surface of an upper end of the body,
Wherein a mounting groove is formed on an upper surface of the seating flange to provide an O-ring that hermetically seals between the flange and the seating flange. 3. The method of claim 2,
The sleeve is made of a non-magnetic material and is formed into a cylindrical shape whose lower surface is opened. The sleeve is coupled between the body and the core of the solenoid, guides the lifting operation of the plunger and the shaft,
Wherein the plunger and the shaft are vertically movable in and out of the sleeve,
A protruding portion having a space in which the shaft moves up and down is formed in an upper portion of the sleeve,
And a stepped stepped portion is formed at an intermediate portion of the sleeve so as to be engaged with an upper end of the coupling rib of the body. 5. The method according to any one of claims 1 to 4,
The solenoid includes a case coupled to an upper portion of the body and the sleeve,
A bobbin installed in an inner space of the case and provided with a coil on an outer circumferential surface thereof,
A plunger disposed inside the sleeve and moving up and down by an electromagnetic force generated in the coil,
A spring for providing a restoring force to the plunger,
A shaft installed inside the plunger and moving up and down together with the plunger to open and close an orifice of the body,
And a core disposed at an upper portion of the plunger so as to be spaced apart from the plunger by a distance at which the plunger moves up and down,
Wherein the lower end of the core is tapered so as to have a smaller diameter toward the lower end. 6. The method of claim 5,
The case includes a cylindrical body formed in a cylindrical shape
And first and second disk members for shielding the upper surface and the lower surface of the cylindrical body,
And a fastening protrusion protruding from an upper portion of the case through a first disc member of the case is formed on an upper end of the core,
A screw thread is formed on an outer circumferential surface of the fastening protrusion to fasten the nut to the core and the case,
Wherein a joint between the upper surface of the first disk member and the fastening protrusion and the nut of the case is caulked. 6. The method of claim 5,
The case includes a cylindrical body formed in a cylindrical shape
And first and second disk members for shielding the upper surface and the lower surface of the cylindrical body,
Wherein the upper and lower ends of the cylindrical body are bent obliquely so as to simultaneously fix the seating flanges of the bobbin, the sleeve and the body disposed between the first and second disk members of the case, respectively.

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