JPS6091075A - Hydraulic solenoid valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a body, a fixed mandrel, a movable ferromagnetic mandrel intended to be displaced against the action of a restoring force through a magnetic field generated by an excitation current; The present invention relates to a hydraulic solenoid valve having a hydraulic solenoid valve. The ferromagnetic mandrel constitutes an occlusion device that cooperates with the valve seat to control fluid flow through the valve. The closure device forms an annular sealing surface with the valve seat in the closed position of the valve.

Scale-type valves supplied with variable frequency current are also known. For valves operating at high frequencies, the stroke and stroke of the movable stem must be relatively weak.

Similarly, the annular sealing surface should be as small as possible in order to reduce the force exerted on the closure device required to close the valve. However, reducing the size of the annular sealing surface entails the disadvantage that the closure device and valve seat are rapidly worn down by repeated blows.

Therefore, the life of the valve is significantly shortened.

The aim of the invention is to eliminate this drawback, and the valve of the invention is characterized in that it comprises a damping device consisting of at least a second annular surface separated from the annular sealing surface by a space. The second annular surface cooperates with an oppositely disposed counterpart to define an annular buffer surface. The annular buffer surface is positioned proximate to or in contact with the counterpart when the closure device is in contact with the valve seat. The space between the annular surfaces communicates with the valve outlet pipe through at least one passageway.

In fact, when the valve closes, the fluid between the second annular surface and the corresponding part must escape radially so as to form only a thin film at the end of the stroke.

This creates a gradual damping effect on the movable mandrel before the closure device comes into contact with the valve seat.

The accompanying drawing schematically shows two embodiments and variants of the valve according to the invention as an implementation.

The valve shown in FIG. 1 has a cylindrical casing 1 of ferromagnetic material. The casing 1 and the inner cylindrical part 2 are integral,
A fixed mandrel is formed, and the movable mandrel 3 is about to collide with the fixed mandrel 2.

An electric coil 4 is arranged between the gauging and the fixed mandrel 2, in which the clamping is held by a part 5.

The eleventh fathom iii of the casing 1 constitutes a skirt 6, the free end of which is fixed to the body 7 and provides 1 with passages 8 for controlling fluids. The body 7 includes a central nipple 9 on which the iiJ axle 3 is slidably mounted.

The movable mandrel 3 is tightened by the part 5 and the collar 11 on the movable mandrel.
It is pulled toward the main body 7 by a return spring 1o supported opposite to the main body 7. The movable shaft 3 is a fluid jIr
The movable mandrel 3 itself constitutes a closure device and is intended to impinge on the fixed mandrel 2 and close the fluid passage.

Fluid is conveyed by a tube (not shown), one end of which is attached to a threaded J-tip on the fixed mandrel 2, allowing fluid to pass into the valve through a hole 14 extending throughout the fixed mandrel.
4 can be communicated.

The movable mandrel 3 has a bore 15, and the two rims of the movable mandrel 3 terminate in an annular flange 16, thus constituting a closure device intended to abut the underside of the fixed mandrel 2 and to prevent the valve from opening. It acts as a valve seat 20 to form an annular sealing surface 22 in the closed position.

The hydraulic valve includes a damping device 19 constituting a second annular surface in the form of a flange 18 spaced from the flange 16 by an annular throat 17 . This flange forms an annular damping surface 23 in cooperation with the fixed axle 2 in its counterpart.

When the annular flange 16 comes into abutment with the fixed mandrel 2, the flange 18 comes close to or even in contact with the annular surface 23. The annular throat 17 communicates through the slot 12 with the passage 8, which serves as an outlet conduit for the liquid.

Therefore, when the valve closes, the liquid between the second flange 18 and the surface of the fixed mandrel 2 flows radially into the annular throat 17.
and towards the chamber 21 between the coil 4 and the movable mandrel 3. This means that the flange 16 is connected to the valve seat 2.
A braking effect is produced on the iJ spindle 3 before it comes into contact with the iJ spindle 3.

Preferably, the annular surface 23 is significantly larger than the annular sealing surface. In principle, the valve is configured such that in the closed position of the valve, while the flange 16 is in contact with the fixed axle 2, there is a gap of several f millimeters between the flange I8 and the surface 23. After some use, repeated closing of the valve causes the flange 16 and its support surface to become hammered, so that the gap between the flange 18 and the annular surface 23 disappears.

It can be seen that in the fully open position of the valve, the entire outer surface of the movable stem 3 is surrounded by fluid at an apparently constant pressure. Therefore, changing the position of the movable mandrel 3 formed by the excitation current in the coil 4 and the restoring force of the spring 10 is probably not subject to hydraulic horns. In order to be able to compensate for the hydraulic pressure acting on the closure device, if the borehole 5 in the movable mandrel 3 extends to the upper end of this mandrel 3 without any change in diameter, the diameter of the nipple 9 is It must be at least equal to the inner diameter of the valve seat.

In the embodiment described with reference to FIG. 1, the valve is in the open position without excitation current. FIG. 2 shows a valve that is closed in the absence of an excitation current and opened under the effect of the excitation current.

In FIG. 2, elements ' corresponding to elements shown in FIG. 1 have the same reference numerals. The cylindrical casing 1, containing the coil 4 therein, is thus fastened to the inner cylindrical part 2 by means of the nut 24. The heath body 25 is screwed into the inner cylindrical part 2 and has an intake tube 26 and an outlet tube 27. The movable axle 3 has at least one longitudinal slot 12 and is drawn towards the closed position by a spring 10. The heath body 25 has a flat surface 28 arranged opposite the movable axle 3 , the central portion 29 projecting and cooperating with the rim 30 of the intake tube 26 to form an annular sealing surface 22 . The annular sealing surface 22 is surrounded by the groove 17 and the annular flange 18 and has opposed flat surfaces 28 .
The annular buffer surface 23 is formed together with the portion . Groove 17
also communicates with the outlet tube 27 through the longitudinal slot 12.

The variants shown in FIGS. 3 to 6 differ by the arrangement of the annular surface and the grooves and their communication with the outlet tubes. Third
In the figure, the movable mandrel 3 has a protruding lateral portion 31, and the annular damping surface 2:J extends from the annular sealing surface 22 to the groove I.
7.

Radial suction I' 7 ) 32, only one of which is shown, is provided in the protruding portion 3 and serves as a passage for the liquid trapped in 'a17.

In the variant shown in the fourth part 1, the groove 17 is arranged in the pace body 25, while the passage connecting the :a17 and the outlet tube is ? It consists of at least one conduit 33 passing through a part of the movable mandrel opposite M17.

On the other hand, in the fifth t2+ smell "ζ", the groove 17 is arranged on the outer peripheral part of the movable shaft 3, and the passage is formed in the air U in the head body 25.
It is in the form of a J-shaped slot 34.

After 1υ, in the variant shown in FIG.
A conduit connecting the groove 17 and the outlet pipe is connected to the heath body 2.
It is located within 5.

[Brief explanation of the drawing]

FIG. 1 is an axial cross-sectional view showing a first embodiment of the present invention. FIG. 2 is an axial cross-sectional view of a second embodiment 8 of the present invention. 3 to 6 are detailed axial cross-sectional views showing the features of the special variant. 7...Body 2...Fixed mandrel 3...Movable ferromagnetic mandrel 20...Valve seat 19...Buffer device 27... ... Outlet pipe 23 ... Annular buffer surface 18 ... Second annular surface (flange) procedural amendment document Showa year, month, day 1, case indication 1982 Patent Application No. (6) , No. 9174 2゜Title of the invention Hydraulic solenoid valve 3, ?1iRelationship with the case of person who shuts off Applicant 4, Agent 5, Date of amendment order Voluntary

Claims (1)

Claims: (11) A hydraulic solenoid comprising a body, a fixed mandrel, and a movable ferromagnetic mandrel intended to be displaced against the action of a restoring force through a magnetic field generated by an excitation current. A valve, wherein the ferromagnetic mandrel constitutes an occlusion device that cooperates with the valve seat to control fluid flow through the valve, the occlusion device being in contact with the valve seat in the closed position of the valve. In a hydraulic solenoid valve forming: at least one annular sealing surface separated from the annular sealing surface by a space;
a damping device consisting of two second annular surfaces;
constitutes an annular buffering surface, the annular buffering surface being close to the corresponding portion when the closure device is in contact with the button 1;
1) positioned in contact with the annular surface for 15 minutes, the space between the annular surfaces extending through the at least one passageway to the valve outlet 1;
−． I'l'! (2) The valve according to claim 1, characterized in that the buffer surface is larger than the sealing surface. (3) The annular surface A valve according to claim 1 or 2, characterized in that the space between the annular surfaces consists of a groove in the movable stem. (4) The space between the annular surfaces consists of a groove in the valve seat. (5) A valve according to claim 1 or 2, characterized in that the passage between the groove and the outlet pipe is in the movable mandrel. The valve according to claim 3 or 4. (6) The passage between the groove and the outlet pipe is in the valve seat. 7. A valve according to claim 3, characterized in that the movable stem has at least one longitudinal slot communicating with the groove.