JPH07243546A - Solenoid-operated high speed response valve - Google Patents

Abstract

PURPOSE:To provide easy and simple adjustability for the magnetic flux attracting an armature by forming an iron core as a fixed one furnished with a hollow along the axis,.inserting an adjusting rod of magnetic substance into the hollow while adjustability is reserved, and adjusting the magnetizing force for the armature. CONSTITUTION:An on/off combination signal current is fed to a solenoid 10, and thereby an iron core 11 attracts and separates an armature 20 so that repetitions between contact and opening to/from a fixed nozzle 6 are made, and the exhaust amount of pressure oil per unit time through the nozzle 6 is restricted by selecting the ON time, i.e., opening time. Therein the magnetic force acting on the tip of the core 11 is proportional to the density of the core. That is, the magnetic force remains weak when an adjusting rod 13 is pulled up to cause the hollow in the core 11 to be empty, and becomes strong when the rod 13 is inserted so that the hollow is filled. Accordingly the magnetizing force to the armature 20 is made adjustable with the amount of rod insertion, and thereby fine adjustment can be made easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic high-speed response valve for adjusting the flow rate of pressure oil by an applied signal current.

[0002]

2. Description of the Related Art An example of the above electromagnetic high-speed response valve is shown in FIG. The electromagnetic high-speed response valve 50 includes a valve body 51 and an electromagnetic section 5
2 and. The valve body 51 is located opposite to the pressure oil supply hole 53, the discharge hole 54, and the electromagnetic portion 52, and is fixed to the fixed nozzle 5.
5 is provided. 56 is an annular groove formed around the fixed nozzle 55 of the valve body 51, 57 is a drain discharge hole,
Reference numeral 58 represents a throttle valve provided in the discharge hole.

The electromagnetic section 52 accommodates an electromagnetic coil 60, an iron core 61 which moves up and down along the axis of the coil, a screw cylinder 62 which is screwed onto the upper portion of the iron core 61 and moves the iron core 61 up and down. And a sleeve 63. The electromagnetic coil 60 is fixed in the sleeve 63 by upper and lower spacers 64 and 65 of non-magnetic material, the iron core 61 penetrates the upper and lower spacers 64 and 65, the upper portion is screwed into the screw cylinder 62, and the lower portion is the sleeve 63. Projects into the space 66 formed below.

Between the lower part of the sleeve 63 and the upper part of the valve body 51, the armature 70 is opposed to the fixed nozzle 55.
To provide. The armature 70 has a plurality of through holes 71 formed at appropriate positions to connect the annular groove 56 and the space 66. Reference numeral 72 denotes an urging means such as a spring for urging the armature 70 toward the fixed nozzle 55.

In the above structure, the amateur 70 is normally used.
Is in contact with the fixed nozzle 55, and the pressure oil supplied from the pressure oil supply hole 53 fills the annular groove 56 and the space 66, but the armature 70 prevents the pressure oil from flowing to the fixed nozzle 55. Then, an ON / OFF combination actuation signal is applied to the electromagnetic coil 60. Amateur 70 by ON operation signal
Is separated from the fixed nozzle 55, and the pressure oil is fixed nozzle 55.
It is discharged from the discharge hole 54 via and is cut off by the OFF signal. Therefore, the discharge amount per unit time is regulated by setting the ON / OFF time ratio.

[0006]

It is inevitable that the pulling force of the armature caused by energizing the electromagnetic coil will have uneven performance due to variations in the characteristics of each component. Therefore, in order to adjust the ejection amount with respect to the applied signal current, a means for adjusting the gap between the iron core 61 and the armature 70 by rotating the screw cylinder 62 and raising and lowering the iron core 61 is usually adopted. As is well known, the amateur attraction force of the iron core due to the signal current applied to the electromagnetic coil is inversely proportional to the square of the distance between the iron core and the armature, and its adjustment range is narrow, which requires a great deal of trouble. is there. In view of these points, the present invention has an object to easily and easily adjust the magnetic flux that attracts an amateur.

[0007]

The electromagnetic high-speed response valve of the present invention for achieving the above object corresponds to the iron core by applying a combined ON / OFF signal current to the electromagnetic coil into which the iron core is inserted. In an electromagnetic high-speed response valve that is provided and operates an armature that opens and closes a pressure oil circuit and adjusts the flow rate of pressure oil according to the ON / OFF time ratio of the applied current, the iron core has a hollow hole along the shaft core. The gist of the present invention is that a fixed iron core is used, and an adjusting rod of a magnetic body is adjustably inserted along the hollow hole of the iron core to adjust the exciting force for an amateur.

According to a second aspect of the present invention, the iron core has an annular notch groove formed at a suitable position, and the magnetic flux passage area is changed by the proximity of the adjusting rod to the notch to adjust the exciting force for the amateur. Is the gist.

[0009]

[Operation] The magnetic force generated in the lower part of the iron core changes depending on the insertion amount of the adjusting rod. Therefore, by adjusting the insertion amount of the adjusting rod, the pulling force of the amateur is regulated and the discharge liquid amount is adjusted.

[0010]

EXAMPLE FIG. 1 shows an example of the present invention. The electromagnetic high-speed response valve 1 is composed of a valve body 2 and an electromagnetic section 3. The valve body 2 includes a pressure oil supply hole 4, a discharge hole 5 and an electromagnetic section 3.
The fixed nozzle 6 is provided to face. Reference numeral 7 is an annular groove formed around the upper fixed nozzle 6 of the valve body 2, 8 is a drain discharge hole, and 9 is a throttle valve, and these configurations are the same as those of the conventional structure.

The electromagnetic section 3 includes an electromagnetic coil 10, an iron core 11 inserted and fixed to the axis of the coil, and an adjusting rod having a magnetic body inserted in a hollow hole 12 formed in the axis of the iron core 11. 13 and a sleeve 14 for housing them.
The electromagnetic coil 10 is composed of non-magnetic upper and lower spacers 15, 16
Is fixed in the sleeve 14 by means of the iron core 11 passing through the upper and lower spacers 15 and 16, and the upper part is fixed to the upper spacer 15 by a tightening nut 17. The lower part of the iron core projects into the space 18 formed below the sleeve 14. Reference numeral 19 denotes a tightening ring for fixing the lower spacer 16 and the iron core 11.

An armature 20 is provided between the lower part of the sleeve 14 and the upper part of the valve body 2 so as to face the fixed nozzle 6. Since this amateur 20 has the same structure as the conventional structure, its explanation is omitted. However, reference numeral 21 is a through hole formed at a proper position, and connects the annular groove 7 and the space portion 18 to each other.

The iron core 11 has an annular cutout groove 22 formed at a proper position. This annular groove 22 is preferably a vertically inclined surface 2.
A trapezoidal cross section is formed with 3a and 23b. Reference numeral 24 represents a nut for fixing the adjusting rod 13.

In the above structure, by applying the same ON / OFF combined signal current to the electromagnetic coil 10 as described above, the iron core 11 attracts and separates the armature 20 to contact and open the fixed nose 6. Repeat and O
By selecting N hours, that is, the opening time, the discharge amount of the pressure oil through the fixed nozzle 6 per hour is regulated.

At this time, the magnetic force applied to the tip of the iron core 11 is proportional to the density of the iron core. That is, when the adjusting rod 13 is pulled up and the iron core is in a hollow state, the magnetic force is weak.
The magnetic force becomes large when the hollow holes are filled. Further iron core 11
When the notch groove 22 is formed in the groove 22, the change in the cross-sectional area depending on the position of the adjusting rod 13, that is, the change in the passing area of the magnetic flux can be made large. Further, by providing the notch groove 22 with a gradient, it is possible to gradually change the cross-sectional area due to the insertion of the adjusting rod 13, that is, the magnetic flux passage area.

[0016]

As described above, according to the present invention, the fixed iron core inserted into the electromagnetic coil is formed with a hollow hole along the shaft core, and the adjusting rod is adjustably inserted into the hollow hole. With this, it is possible to adjust the exciting force with respect to the armature that is placed below the iron core. The change in magnetic flux at this time is proportional to the insertion amount of the adjusting rod, and therefore fine adjustment is easy.
In addition, when forming an annular notch in the iron core in place,
Due to the proximity of the adjusting rod to the notch, the change in the passing area of the magnetic flux becomes large, and the attraction force for the amateur can be adjusted more easily.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an electromagnetic high-speed response valve of the present invention.

FIG. 2 is a vertical cross-sectional view of a conventional electromagnetic high-speed response valve.

FIG. 3 is an enlarged explanatory diagram of a main part in FIG.

[Explanation of symbols]

 1 Electromagnetic High Speed Response Valve 10 Electromagnetic Coil 11 Iron Core 12 Hollow Hole 13 Adjusting Rod 20 Armature 22 Notch Groove

Claims (2)

[Claims] 1. An electromagnetic coil into which an iron core is inserted is turned on and off.
In an electromagnetic high-speed response valve that applies a combined signal current of FF, operates an armature that is provided corresponding to the iron core and that opens and closes a pressure oil circuit, and adjusts the flow rate of pressure oil according to the ON / OFF time ratio of the applied current, The iron core is a fixed iron core having a hollow hole drilled along the shaft core, and an adjusting rod of a magnetic body is adjustably inserted along the hollow hole of the iron core to adjust an exciting force for an amateur. An electromagnetic fast response valve. 2. The iron core is characterized by forming an annular notch groove at a proper position, and by adjusting the distance between the adjusting rod and the notch, the change of the magnetic flux passage area is increased to adjust the exciting force for the amateur. The electromagnetic high-speed response valve according to claim 1.