JPS58166184A - Solenoid valve - Google Patents

Abstract

PURPOSE:To enable to increase the attractive force of a plunger without increasing the size of an electromagnet, by employing such an arrangement that the path of magnetic flux can be intercepted by a connecting rod of the electromagnet at a cutaway portion of a fixed iron core. CONSTITUTION:When the current is passed through a coil 11, paths of magnetic flux are formed in a fixed iron core 14. Here, since the fixed iron core 14 has a cutaway portion 18 on the inside of the coil 11, a plunger 38 is moved toward the attracting position by the magnetic attractive force corresponding to the level of current passed through the coil 11 at the time, in the manner of supplementing the magnetic path at the cutaway portion 18. By this movement of the plunger 38, a spool 8 is moved by a connecting rod 43 against the force of a valve spring 9 to a position where an oil feed hole 4 and an oil discharge hole 5 of a valve means 1 are communicated with each other.

Description

[Detailed Description of the Invention] Jin's invention relates to a solenoid valve, and more specifically, a valve device that has a spool that can move forward and backward within the main body, and a magnetic flux generated by a cylindrical coil that is fixed along a magnetic path. Place the iron core and place the plunger on the inner circumference of the coil.
EK is arranged, and furthermore, this plunger is connected to the above-mentioned spool by a connecting rod. This invention relates to a solenoid valve in which the plunger is moved from a retracted position away from the valve device to a suction position that compensates for the missing portion 01111 by energizing the coil.

Since the connecting rod that connects the plunger and spool in the conventional OkoO@O solenoid valve is shaded with a magnetic material such as iron,
Magnetic flux leaks through the connecting rod in the missing part of the fixed core, reducing the attraction force of the plunger, causing the valve device to operate unreliably, and requiring an electromagnet of 11KL. There was a layer point.

Therefore, the present invention has been made to solve the above-mentioned problem, and is configured so that the magnetic path of the magnetic flux can be blocked at the missing part of the fixed core that is the connecting rod of the electromagnet, and the size of the electromagnet can be increased. A description will now be given of the drawings showing an original embodiment of a solenoid valve designed to increase the attractive force of all the plungers without causing any damage.

lk! This is a valve device that controls the flow of liquid such as oil.

In this valve device I, a 2#i main body is provided with a spool sliding hole 3, an oil supply hole 4, an oil drain hole 5, and a communication hole 6.7, as shown in FIG. 7, respectively.

The spool is fitted into the spool sliding hole 3 so that it can move forward and backward, and at the forward end position, the KM# hole 4 is inserted into the spool sliding hole 3 as shown in Fig. 7.
The oil supply hole 4 and the oil drain hole 5 are made to communicate with each other when the oil supply hole 4 and the oil drain hole 5 are moved toward the reverse end position. A 9tj pulp spring is enclosed so as to bias the spool feeling toward the forward end.

Next, 1no is an electromagnet attached to the above-mentioned valve device 1.

This electromagnet N is constructed by winding a cylindrical bobbin ME@@1;2 with a u#'i sieve-shaped coil and molding it. A fixed iron core disposed along the magnetic flux O magnetic path generated by the MFi coil H. It is composed of a stop member b1 made of magnetic material, a cylindrical member secretion, and a cylindrical yoke 17 with both ends open. The connection between the stopper member, which is part of the inner part, and the cylindrical part
I have a nephew who lacks Fi. When the rays of the rear cylindrical portion of the stopper member are fitted into both ends of the pipe 19O formed of a non-magnetic material, the KO ring 20. ! It is sealed by IK to form a cylindrical body 22, and this II-shaped body 22 is fitted into the bobbin ν. The stopper member is sealed with a KO ring B so as to watertightly close the spool sliding hole 3 to the main body! The insertion hole 2 and the communication hole 2 are formed in the insertion hole 2. Above yoke 17If
i The four doors that make up the case of the electromagnet are attached to the main body 2 by means of an attachment port. This yoke 17ki has a connecting part I in the 0111 part, and its circumference 1
#i male thread va is carved in 1. Next, 'In' is a cover whose fitting part 2B is rotatably attached to the tip of the sieve member vine, and is watertightly sealed by an O-ring 29. This cover path has an engaging flange I formed on the outer periphery of a part thereof, which can come into contact with the cylindrical member door or the front end surface of the yoke 170, and this cover 111 has a storage hole at the center position, which is large from the center. Air vent hole 3 in an advantageous position
! are formed respectively. In addition, the above cover 28#I'
i It is preferable to use a non-magnetic material. 333 company's above-mentioned set screw with one hole WK screwed together, its screw 11133
As shown in FIG. 3, an air vent groove 34 is formed on the outer periphery of m. These air holes! A lock 11W is formed on a part of the inner periphery of the holding tool, which can be engaged with the engaging flange I of the perforation ring holder m. 3
8#i Kf that can freely move forward and backward into the cylindrical body section! The crossed plunger is fixed to the connecting rod by a lock pin aK to be described later, and the trap is moved between the suction position of the valve device and the retracted position on the opposite side (the position shown in Fig. 7). It has become.

This plunger 38 is formed with an oil escape port.

41. ah slide bearings fitted into the insertion holes and storage holes 31, respectively; 11m to connect the plunger to the spool 8. This connecting rod m#1 is made of a non-magnetic material such as ceramic, which has excellent wear resistance and corrosion resistance*. Note that this connecting rod C is at least connected to the plunger iris O in the retracted position.
It is sufficient that the image of the valve device 1 and the portion of the end of the valve device 1 in the above-mentioned deficiency @111, where flK is located, are formed of a non-magnetic material. The shrine is a spacer attached to the stop member 15 to prevent the plunger iris from sticking to the stop member stop.

In the case of the above structure, when it is used by being attached to a desired O machine, it is adjusted so that the air vent hole 32 of the cover 3 is on the upper side with respect to the center of the cover ff1O when it is attached to the machine. When making this adjustment, first loosen the presser foot and rotate the cover lever until the air vent hole is opened.
, as shown in Figure 2, position it so that it is above the center of movement, that is, above the center axis of the forward and backward movement of the plunger, and then tighten the presser foot again to release the cover 28 at the locking part l.
0 Press the engagement collar against the cylinder member ratio or yoke 17, and then
Secure the cover in place. The position adjustment of the cover 3 may be performed before the solenoid valve is installed on the machine, or it may be performed after the solenoid valve is installed. Next, the valve device 10, the oil supply hole 4, the spool slider large 3, the oil drain hole 5, and the communication hole 6.7 and fill the electromagnet 100 cylindrical body with Kla. In this case, the air in the hole 3 of the spool layer 1, that is, the air that exists in the space around the spool 80, and the air in the cylindrical body n, that is, the air that exists in the space of the plunger WIC)jII@C) can be easily calculated as follows. k and can be discharged reliably. That is, when the set screw O is loosened and a part of the air vent groove is exposed outside the air vent hole IIO, the cylindrical body n
The air inside passes through the air vent hole and the air vent groove to the outside, and after this air is completely exhausted, tighten the set screw O again to completely close the air vent hole. The spool sliding hole 3 and the inside of the cylindrical body n are completely filled with oil. Note that the above-mentioned air discharge can be carried out in the same manner as in the case where air has accumulated inside the cylindrical body n while the solenoid valve is in use.

Next, when operating solenoid valve 1, when coil n is energized, coil U generates a magnetic flux path within fixed core I; Therefore, in order to compensate for the magnetic path in this missing part, the plunger M is directed toward the suction position and is attracted with a skin-sized suction force according to the current value of the power flowing through the coil uK.

By moving this plunger iris, the connecting rod 43F
The i spool 8 is moved against the valve d 9 to communicate the oil supply hole 4 and the oil drain hole 5 of the valve device 1. When the plunger 3B is moved as described above, since the connecting rod is made of a non-magnetic material, magnetic flux is prevented from leaking through the connecting rod C in the above-mentioned missing part, and the magnetic flux is prevented from leaking through the connecting rod C. The 38 mm thick plunger is sucked with just one punch. Also,
If the plunger 1, spool 8, etc. are stretched,
Since the spool slide [hole 3 and the inside of the cylindrical body section are filled with oil, the hydraulic pressure applied to the plunger iris and spool 8 in the forward and backward directions is balanced. For this reason, the plunger moves forward and back in response to the electromagnetic force generated by energizing the stabbing coil. In addition, at this time, no air is left in the spool sliding hole 3 or the cylindrical body n, so the plunger head etc. will not become inefficient due to the compressibility of the air O, and the plunger ease etc. ? It is possible to stabilize l to regular L. When the power supply to the fill U is cut off, it is returned to the retracted position by the spring force of the spool 8 and the plunger sFi pulp spring SO&f.

As described above, in the present invention, by energizing the coil U, magnetic flux is generated, the plunger is moved to the suction position, and the valve device is actuated. Of course, when attempting to move the plunger in this way, if part of the connecting rod is made of non-magnetic material, magnetic flux will leak through the connecting rod at the missing portion 4. Since it is designed to prevent this, most of the magnetic flux passing through the missing portion can be used to attract the plunger towards the attraction position, which has the effect of generating a large attraction force. be. This is very useful because even a small electromagnet can reliably operate the valve device with a large force.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a longitudinal cross-sectional view;
2 is a right side view of FIG. 7 and an enlarged perspective view showing the third WJ fixing screw. 1... Valve device, 2... Main body, 8... Spool, 1
0...1111 stones, 11...Coil, k...Fixed core, Excuse...Missing part, Easy...Plunger, 4...
Connecting rod.

Claims (1)

[Claims] The valve device and the electromagnet attached to the valve device have a reciprocating IIO spool in the main body, and the electromagnet company has a cylindrical coil and a magnetic flux generated by the coil. A plunger is arranged so as to be able to move forward and backward, and the plunger is arranged to move forward and backward between the center of the valve device and the retracted position of the valve device inside the coil O. The plunger has a cutout along the magnetic path in a part of the part located inside the coil O, and furthermore, the plunger has a cutout along the magnetic path. In the electromagnetic valve, the valve is moved from the retracted position, which was erroneously removed from the valve device, toward the suction position, which compensates for the missing O magnetic path of the fixed core, by energizing the valve, and the valve of the plunger is moved to the retracted position. A solenoid valve characterized in that the device side surface and the connecting rod located on the valve device side 0f8011 in the gap IILK are carved with a non-magnetic material so as to be able to block a magnetic path.