JPS6224086A - Solenoid valve - Google Patents

Abstract

PURPOSE:To improve the electrical responsiveness of electromagnets by distributing multiple electromagnets and arranging a thin plunger having edge sections facing yokes inside a coil section. CONSTITUTION:Multiple coil assemblies 12a, 12b... are stacked in a case 8 concurrently serving as a magnetic path to constitute the coil section of an electromagnet section 1. The magnetic flux passes through yokes 3a, 3c, 3e in the same direction but passes through yokes 3b, 3d in the opposite direction. Accordingly, the magnetic flux passing through the yokes 3b, 3c, 3d is added due to coils arranged on their both sides. Since a plunger 6 and a shaft 7 also become a magnetic path, a magnetic path having a sufficient area can be secured even if the thickness of the plunger 6 is thin.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a solenoid valve for controlling fluid pressure, and particularly to a solenoid valve optimal for exhibiting high response.

[Background of the invention]

Conventionally, in this type of solenoid valve, the number of turns of the coil is increased when driving force is required, but this increases the inductance of the coil and reduces the electrical response. Therefore,
A solenoid with a structure in which the coil is wound in a spiral shape and the range of force applied is extended ("Technical Paper Series" published by Society of Automotive Engineers) Te
chni, calPaper 5eries 1979
It is disclosed in the literature of 2010). However, in this case, since the range of action of the force is linear, it is difficult to maintain a constant operating distance of the plunger, and if such means were provided, the structure would be complicated. Furthermore, according to the above-mentioned document, since the movable part is arranged outside the coil, the mass increases. That is, the mass of the movable part increases for reasons such as ensuring a magnetic path cross-sectional area for passing the magnetic flux generated by the electromagnet and transmitting the force generated in this part to the center of the shaft. Therefore, the eigenvalue of the mechanical system decreases, and there is a limit to the response.

[Purpose of the invention]

The purpose of the present invention is to improve the electrical response of an electromagnet, and also improve the mechanical response by reducing the mass of the mechanical movable part to the utmost limit, and furthermore, it is possible to easily limit the operating range of the movable part. As a structure.

The aim is to improve its efficiency.

[Summary of the invention]

In order to achieve the above object, the present invention distributes electromagnets into a plurality of electromagnets, reduces the number of coil turns in one electromagnet, and connects these electromagnets in parallel.

Further, the electromagnetic movable part has a cylindrical shape that is slidable along an axis located at the center, and the necessary magnetic path area is secured by the central kite part and the cylindrical movable part.

Furthermore, by stacking multiple coils and yokes,
The range of action of the force is composed of a plurality of flat parts.

[Embodiment of the Invention] FIG. 1 is a sectional view showing an embodiment of the solenoid valve according to the present invention. The solenoid valve is composed of an electromagnet section 1 and a valve section 31.

The electromagnet section 1 constitutes a coil section by laminating a plurality of coil assemblies 12a, 12b, . . . on a case 8 which also serves as a magnetic path. The coil assembly 12a is composed of a yoke 3a, a coil 2a wound around a bobbin 5a, a spacer 4a which also serves as a magnetic path, and a collar 60 of a plunger 6, and is hereinafter referred to as 12b.

The same applies to 12c, . . . . The plunger 6 is hollow and is held by a guide shaft 7 fixed by an end plate 11 and a holding member 9 so as to be slidable in the axial direction. Further, the plunger is pushed to the right in the axial direction by the spring 12. Coils 2a and 2c are excited in the same direction, but coils 2b and 2cl are excited in opposite directions. Therefore, York 3
a, 3c, 3. a has magnetic flux directed in the same direction, and yoke 3b
, 3d, the magnetic flux is directed in the opposite direction.

The valve portion 31 is connected to the spool 32. Sleeve 33 that holds the spool slidably in the axial direction, valve body 34° plunger 6
It consists of a rod 37 that transmits the force to the spool, a member 36 that supports the rod, and a spring 35 that pushes the spool in the direction of the plunger. The illustration shows the case of an ON-FF switching valve, and particularly shows a case where it is open when not energized and closed when energized, and shows a valve that opens and closes between the flow path 38 and 39.40.

Since the solenoid valve according to the present invention has the above-described configuration and structure, it operates as follows. Coils 2a, 2b.

. . . is a configuration in which the coils are input in parallel, and each coil has a small inductance. Therefore, when energized by a command, the current in each coil rises in an extremely short time. Since the winding directions of adjacent coils are opposite to each other, the direction of current flow is also opposite, and the generated magnetic flux is also opposite. That is, yoke 3 +1 + 30
g 3 e pass in the same direction.

3b and 3d are in opposite directions. Therefore, yoke 3b.

Magnetic flux is added to 3c and 3d by coils placed on both sides thereof. Further, since the plunger 6 and the shaft 7 also form a magnetic path, by appropriately selecting the dimensions of the shaft 7, even if the wall thickness of the plunger 6 is thin, a magnetic path with a sufficient area can be ensured.

Therefore, since the plunger 6 has a thin wall, the weight of the plunger 6 can be reduced to the utmost. Furthermore, there are many points where suction force is generated between the yoke and the edge of the plunger.

? ! The driving force generated in the electromagnet section increases. That is, the electromagnet section according to the present invention can generate a large driving force in an extremely short period of time.

The valve part 31 shows, as an example, a structure for switching between opening and closing, and is normally in an open state and is in a closed state when the electromagnet part 1 operates. That is, by the operation of the spool 32, the channels 38 and 4
Opens and closes between 0 and 0. At this time, since the electromagnet section 1 has a large output and high response as described above, the valve section 31 also operates at high speed and can exhibit the required performance. That is, it is possible to respond to a high-frequency pulse train, and the illustrated solenoid valve can also be used to control a larger fluid pressure control valve by a pulse train signal. FIG. 2 shows an example.

That is, it consists of a main valve 51, an electromagnetic reducer 52,53 according to the present invention, and a high pressure port 54. Control port 55, tank port 5
6 and operates on commands 57 and 58. When high pressure acts, the fluid pressure acts on the pilot pressure receiving portion 51a of the main valve 51. Pilot pressure receiving part 51 on the opposite side
b has a larger area than 5]-a. The pilot valve 52 is always closed, and the pilot valve 53 is always open. By cooperatively controlling these two pilot valves 52 and 53, the pressure of the pressure receiving part 51b is controlled, and the position of the main valve is controlled by balancing the forces of the two pilot pressure receiving parts. At this time, the higher the response of the pilot valves 52 and 53, the more the main valve 5
The control operation in step 1 also becomes faster and the control accuracy improves. Second
The figure shows a system in which two electromagnetic on-off valves are operated cooperatively as pilot valves, so it is sufficient to use a switching valve system. At this time, in order to perform more precise control, the pilot valve 5
2.53 is controlled by a pulse train.

〔Effect of the invention〕

As described above, the solenoid valve of the present invention has the following effects. First, the response of the electromagnet is dramatically improved because the inductance of the electromagnet is small, the electromagnetic response is high, and the mass of the plunger, which is a moving part, is reduced in weight. This increases the response of the solenoid valve and improves the response to pulsed input signals. Therefore, when a fluid pressure control valve is configured in combination with a main control valve, its responsiveness and controllability are improved. Furthermore, since an essentially inexpensive electromagnet is used, it is also highly economical.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the solenoid valve of the present invention, and FIG.
The figure shows a large-sized control valve to which the solenoid valve of the present invention is applied.

Claims (3)

[Claims] 1. A solenoid valve using an electromagnet consisting of a yoke, a coil, and a plunger, characterized in that a coil part formed by laminating a plurality of sets of yokes and coils, and a thin plunger having an edge facing the yoke are arranged inside the coil part. Solenoid valve. 2. 2. The electromagnetic valve according to claim 1, wherein the thin-walled plunger is held by a guide shaft having one end fixed, and is slidably guided by the guide shaft. 3. The solenoid valve according to claim 1, wherein a current is applied to the plurality of coils in parallel.