JP2576792Y2 - solenoid valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for opening and closing a flow path of a pressurized fluid used for air / oil body equipment, etc., and particularly to a normally open solenoid valve.

[0002]

2. Description of the Related Art As an electromagnetic valve, a housing having an accommodation hole for accommodating an electromagnetic valve, an armature having a valve rod slidably accommodated in the inner side of a hole of a hermetically sealed sleeve, and the valve rod being inserted. A magnet core housed in a sealed sleeve, a coil assembly that is armored to the armature and slides the armature by electromagnetic force, and a return spring contracted between the armature and the magnet core. There is a normally-open electromagnetic valve which sometimes slides an armature toward a magnet core by electromagnetic force to seat a valve stem tip on a valve seat arranged on an extension of the valve stem and closes the valve. In this type of solenoid valve, it is necessary to secure a predetermined gap between the armature and the magnet core when the valve is opened. This clearance amount is set to a dimension slightly larger than the operation stroke length of the amateur so as not to prevent the valve rod tip from sitting on the valve seat when the valve is closed.

[0003]

[Problems to be Solved by the Invention] In the above-described normally-open solenoid valve, the work of setting the gap between the armature and the magnet core to a predetermined size when the valve is opened requires a lot of man-hours. Has been pointed out.

[0004]

[Object of the present invention] The present invention has been made in view of the above points, and an object of the present invention is to provide the following solenoid valve.

A solenoid valve that can reduce the number of assembly steps.

[0006] A solenoid valve with an accurate operation stroke of an amateur.

[0007] An electromagnetic valve that can be reduced in weight.

[0008]

According to the present invention, there is provided an armature having a housing hole for accommodating an electromagnetic valve, an armature having a valve rod slidably housed in the inner side of a hole of a sleeve having a sealed structure, and A magnet core housed in a hermetically sealed sleeve through a valve stem, a coil assembly that is armored and slides an armature by electromagnetic force, and a return spring contracted between the armature and the magnet core. Prepared,
When the armature is slid to the magnet core side by electromagnetic force when energized, the tip of the valve rod is seated on the valve seat arranged on the extension of the valve rod, and the valve is closed. The stroke setting member is frictionally engaged and accommodated in the accommodation hole drilled at the end of the armature, and the sleeve is moved to the final assembly position with the adjustment shim having a predetermined thickness interposed between the armature and the magnet core. An electromagnetic valve which pushes the armature into the housing hole until reaching, and sets the operation stroke amount of the armature assembly to a predetermined value by pressing a stroke setting member protruding from the housing hole via the sleeve.

[0009]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings.

<A> Temporary crimping of the pin As shown in FIG. 2, the armature 10 has a shaft hole 12 for inserting a valve stem 11 as a valve body in a shaft core, and a larger half of the shaft hole 12 in the upper half thereof. It has a large-diameter hole 13 formed in a diameter. Then, the upper portion of the valve stem 11 is inserted into the shaft hole 12 of the armature 10, and the periphery of the shaft hole 12 on the bottom portion is lightly swaged so that the valve stem 11 does not fall off from the armature 10.

<B> Setting of Air Gap In FIG. 3, the body 20 has a stepped hole 21 at its axis.
A valve seat 22 is mounted on the bottom surface of the large-diameter hole and constitutes a valve mechanism together with the valve rod 11. Further, a part of the body 20 has a plurality of flow paths 23 communicating with the stepped hole 21. The magnet core 30 has a stepped hole 31 penetrating vertically, and a seating surface 32 is formed at a large-diameter skirt on the outer periphery. The magnet core 30 is placed with its bottom surface in contact with the stepped surface 24 of the stepped hole 21 of the body 20, and then the above-described valve stem 11 with the armature 10 is inserted into the stepped hole 31 of the magnet core 30. At this time, the magnet core 30
And a disc-shaped air gap adjusting shim 34 interposed between the upper surface of the armature 10 and the lower surface of the amateur 10. The air gap adjusting shim 34 is a thin plate for setting an air gap t between the armature 10 and the magnet core 30 when the valve is closed. Valve stem 1 with air gap adjusting shim 34 interposed
1 and presses the valve ball 21 at the tip of the valve rod 11 to the valve seat 22.
Then, the upper surface of the amateur 10 is pressed toward the magnet core 30. Thereby, the peripheral surfaces of the valve stem 11 and the shaft hole 12 of the armature 10 slide with each other, and a predetermined air gap t can be set between the armature 10 and the magnet core 30 in the valve closed state.

<C> Clamping of Valve Stem Subsequently, the side of the armature 10 is crimped so that the valve stem 11 does not come off, and the valve stem 11 is fixed to the armature 10.

<D> Setting of Spring Pin Next, as shown in FIG. 4, the lower part of the spring pin 14 is inserted into the large diameter hole 13 of the armature 10. The spring pin 14 is a member that regulates the return position of the armature 10 when the valve is opened, and is formed by bending a rectangular spring steel into a C-shaped cross section to impart elasticity in the radial direction. Spring pin 1
The spring force applied to 4 is such that a frictional engagement force that does not allow the spring pin 14 to slide in the large-diameter hole 13 by opening and closing the valve can be obtained between the spring pin 14 and the large-diameter hole 13. After the spring pin 14 is inserted into a shallow position in the large-diameter hole 13 in a reduced diameter state, the diameter reduction force is released to make the spring pin 14 elastically contact the inner peripheral surface of the large-diameter hole 13.

<E> Set of Sleeve Next, as shown in FIG. 5, the sleeve 40 is connected to the magnet core via a stroke adjustment shim 35 instead of the air gap adjustment shim 34 between the armature 10 and the magnet core 30. 30 is packaged. Shim 35 for stroke adjustment
Is the armature 10 and the magnet core 3 in the valve open state
A plate piece for setting a final gap X between the armature 10 and the magnet core 30 when the valve is closed.
And a predetermined stroke amount s of the valve between the open state and the closed state is added to the air gap t between the two. The sleeve 40 is a cylindrical body having an upper part 41 having a dome shape and a uniform diameter, and is bent outward so that a skirt part 42 thereof is in close contact with the bearing surface 32 of the magnet core 30. When the sleeve 40 is strongly pushed downward until the skirt portion 42 of the sleeve 40 comes into contact with the bearing surface 32 of the magnet core 30, the spring pin 14 comes into contact with the inner surface of the upper portion 41 of the sleeve 40 and It is inserted deep into the hole while resisting frictional resistance with the hole wall. As described above, the predetermined gap X is set between the armature 10 and the magnet core 30 when the valve is opened by simply pushing the sleeve 40 in until the skirt portion 42 of the sleeve 40 comes into contact with the seat surface 32 of the magnet core 30. it can.

<F> Main assembly Since the stroke adjusting shim 35 is still interposed between the amateur 10 and the magnet core 30, the sleeve 40 is once removed and the stroke adjusting shim 35 is removed. Then, as shown in FIG. 1, the return spring 33 is accommodated in the stepped hole 31 of the magnet core 30, the armature 10 and the magnet core 10 are assembled, and then the sleeve 40 is mounted. The sleeve 40 is liquid-tightly fixed to the body 20 by caulking the skirt 42 of the sleeve 40. Sleeve 40
The fixing means is not limited to caulking, and known fastening means such as brazing or laser welding can be employed. Next, after assembling the O-ring 25 on the outer periphery of the body 20,
The body 20 is inserted into the housing holes 51 having different diameters of the housing 50, and the body 20 is liquid-tightly fixed to the housing 50 by caulking or the like. Next, the coil assembly 60 is attached to the sleeve 40.
Then, the sleeve 40 and the coil assembly 60 are integrated using the retaining ring 61 to complete the assembly of the solenoid valve. Note that reference numeral 52 in FIG. 1 denotes a flow passage that is formed so as to communicate with the accommodation hole 51.

[0016]

Next, the operation of the solenoid valve will be described.

<A> Valve Opening FIG. 1 shows a valve opening state when power is not supplied. Since the coil assembly 60 is not energized, the armature 10
Is biased in the direction away from the magnet core 30 by the spring force of the return spring 33, and the spring pin 14 protruding from the end of the armature 10 abuts on the inner peripheral surface of the sleeve 40 to regulate the return position. Spring pin 14 and accommodation hole 13
Is set so as to be able to oppose the spring force of the return spring 33, so that there is no concern that the spring force of the return spring 33 causes the spring pin 14 to be displaced in the housing hole 13. Therefore, the valve stem 11 integrated with the armature 10 is separated from the valve seat 22 to maintain the valve-open state, and the stroke adjusting shim 35 shown in FIG.
Is formed equal to the thickness of the sheet.

<B> Valve Closure In FIG. 1, when the coil assembly 60 is energized, the armature 10 is excited and moves in the direction to shorten the gap X. The valve stem 11 moves integrally with the amateur 10, and the tip of the valve stem 11 is seated on the valve seat 22. Since the gap between the armature 10 and the magnet core 30 at the time of closing the valve has been set by the air gap adjusting shim 34 in FIG. 3, it is necessary to secure an interval corresponding to the plate thickness t of the air gap adjusting shim 34 to close the valve. Become.

[0019]

Modification In the above embodiment, the case where the magnet core 30 is attached to the housing 50 via the body 20 has been described.
It is also possible to apply to the type to be assembled in.

[0020]

Embodiment 2 In the above embodiment, the case where the stroke setting member is constituted by the spring pin 14 has been described. However, a cylinder or a rod having no spring property may be used instead. in this case,
A cylinder having a spring property to be frictionally engaged with the accommodation hole 13 of the armature 10 is formed on the peripheral surface of the cylinder or the rod body, or a projection having the spring property is incorporated into the accommodation hole 13 side to form a cylinder serving as a stroke setting member. A body or a rod is frictionally engaged with the receiving hole 13.

[0021]

[Effects of the Invention] The present invention is as described above, and the following effects can be obtained.

<B> The pin can be firmly fixed to the armature by a simple operation of inserting the stroke setting member into the accommodation hole of the core assembly and frictionally engaging the stroke setting member. No fixing work is required.

<B> Since the stroke setting member only frictionally engages with the accommodation hole of the core assembly, the gap between the armature and the magnet core when the valve is opened can be adjusted in minute units.

<C> If the stroke setting member is formed of a hollow pin, the weight can be reduced and the operation response of the amateur can be improved.

[Brief description of the drawings]

Fig. 1 Longitudinal sectional view of a completed solenoid valve

[Fig. 2] Assembly drawing of amateur and valve stem

FIG. 3 is an explanatory diagram of a method of setting an air gap between an armature and a magnet core when the valve is closed.

FIG. 4 is an explanatory view when setting a spring pin.

FIG. 5 is an explanatory diagram of a method of setting a gap X between an armature and a magnet core when the valve is opened.

Claims (2)

(57) [Scope of request for utility model registration] 1. A housing having an accommodation hole for accommodating an electromagnetic valve, an armature with a valve rod slidably accommodated in the inner side of a hole of a sleeve having a sealing structure, and said valve rod being inserted therethrough to form a sealing structure. It has a magnet core housed in a sleeve, a coil assembly that is armored to the sleeve and slides the armature by electromagnetic force, and a return spring contracted between the armature and the magnet core. A normally open solenoid valve that slides to the magnet core side and closes the valve by seating the valve stem tip on the valve seat arranged on the extension of the valve stem. The stroke setting member is accommodated in the accommodation hole by frictional engagement, and the sleeve reaches the final assembly position with the adjustment shim of the specified thickness interposed between the amateur and the magnet core. Until pushed into the armature of the receiving hole, it is set to a predetermined value the operation stroke of the armature assembly by pushing stroke setting member protruding from the housing hole through the sleeve, solenoid valve. 2. The solenoid valve according to claim 1, wherein the stroke setting member is a pin member having a spring property in a radial direction.