JPH0224963Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dry type servo valve that can be used in various hydraulic control systems.

[Conventional technology]

Conventionally, a micro-oscillating member such as a flapper is deflected by an electromagnetic actuator to change the back pressure of a nozzle arranged in the body, and the back pressure change can be used to operate a valve body such as a spool. The servo valve made by the above is known. In addition, if this is only the case, the fluid in the body, for example,
Since there is a risk that hydraulic oil may flow into the actuator through the periphery of the micro-oscillating member and obstruct the operation of the actuator, a dry type has also been developed in which the inside of the body is isolated from the actuator. Conventional servo valves of this type, for example, as shown in Japanese Patent Publication No. 49-34228, are provided with a tube whose inner end communicates with the inside of the body and whose outer end is closed. This tube is generally press-fitted into the axial center of the electromagnetic actuator, and the flapper is housed within the tube with its tip facing into the body. The flapper is supported in a cantilever manner within the outer end of the tube.

[The problem that the idea attempts to solve]

However, with such a configuration, during assembly, it is essential to fix the proximal end of the flapper to the innermost part of the tube, and to press fit the tube into the axial center of the actuator. There are disadvantages in that it takes time and effort to manufacture and it is difficult to reduce costs.

The present invention was developed in view of these circumstances, and not only can it reliably prevent the fluid in the body from entering the electromagnetic actuator side, but it also has a simple structure and is easy to manufacture. It is an object of the present invention to provide a servo valve that can reasonably reduce costs without causing a deterioration in performance, and can also improve maintainability.

[Means to solve the problem]

In order to achieve this purpose, the present invention has developed a servo valve with a micro-oscillating member such as a flapper or a jet pipe that causes a change in fluid pressure by deflection of the tip, and a micro-oscillating member such as a flapper or jet pipe, in which the tip of the micro-oscillating member is inserted. a body having an opening in which the fluid is present; an electromagnetic actuator attached to an open end of the body to deflect the minute swinging member; and a diaphragm sealing the opening of the body. The micro-oscillating member is supported through the diaphragm, and the supporting portion serves as a hinge point of the micro-oscillating member. and,
The minute swinging member is made up of a tip member located on the inner surface side of the diaphragm and a base end member located on the outer surface side, and a bolt portion protruding from the end surface of the tip member is passed through the diaphragm. The base end member is screwed into a screw hole opened in the end face of the proximal end member and tightened.

[Effect]

According to such a configuration, when the electromagnetic actuator is actuated to apply a tilting force to the micro-oscillating member, the portion of the diaphragm other than the peripheral edge of the diaphragm that supports the micro-oscillating member is primarily elastically deformed, and this micro-oscillating member The swinging member tilts approximately around the hinge point. As a result, the position of the tip of the minute swinging member changes, and the pressure of the fluid changes due to the same effect as in the conventional structure.

Since this servo valve uses a diaphragm to seal the opening of the body, there is no sliding seal part, and a reliable sealing structure can be obtained.

As mentioned above, the micro-oscillating member consists of a distal end member and a proximal end member, so by unscrewing the distal end member and the proximal end member, the micro-oscillating member can be adjusted. It can be easily removed from the diaphragm. Then, by performing the reverse operation, the minute swinging member can be attached to the diaphragm. In the installed state, the end surface of the distal end member and the end surface of the proximal end member squeeze the central portion of the diaphragm, so that an installed state without wobbling can be obtained.

〔Example〕

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

FIG. 1 is a front sectional view showing the main parts of the servo valve according to the present invention, and the spool arrangement part and the like are not shown because they are conventional. As shown in this drawing, this servo valve includes a flapper 1 as a micro-oscillating member, a body 5 having an opening 2 into which the flapper 1 is inserted, and housing a pair of nozzles 3 and 4 therein. It is equipped with an electromagnetic actuator 6 that is attached to the open end of the body 5 and deflects the flapper 1, and a diaphragm 7 that seals the opening 2 of the body 5, and the flapper 1 is supported through the diaphragm 7. The support portion thereof serves as the hinge point 8 of the flapper 1. More specifically, the flapper 1 consists of a distal end member 9 located on the inner surface 7a side of the diaphragm 7, and a proximal end member 10 located on the outer surface 7b side. The bolt portion 11 is fitted and fixed to the center of the diaphragm 7 by screwing and tightening the bolt portion 11 into a screw hole portion 12 that passes through the diaphragm 7 and opens at the end surface of the base end member 10. The distal end portion 9a of the distal end member 9 is formed into a flat plate shape, and is positioned between the nozzles 3 and 4. The proximal member 10 is made of a magnetic material and includes a columnar core portion 10a and an armature portion 10b provided at the tip of the core portion 10a. Further, the diaphragm 7 is
It is a disc-shaped member made of an elastic thin plate material, and its peripheral edge 7c is attached to the stepped end face 2a of the opening 2 of the body 5. And this peripheral part 7
c is fixed to the step end surface 2a by the restraining ring 13.
It is fixed in a liquid-tight manner. On the other hand, the electromagnetic actuator 6 has a solenoid 15 disposed within a housing 14 disposed at a position surrounding the core portion 10a of the proximal end member 10, and a solenoid 15 disposed in a housing 14 that surrounds the core portion 10a of the proximal end member 10. 1
Yokes 16 and 17 are placed close to 0b from both sides, and a permanent magnet 18 is placed between these yokes 16 and 17.
It was constructed by

With such a configuration, the lines of magnetic force coming out from the N pole of the permanent magnet 18 of the electromagnetic actuator 6 are connected to the yoke 16, the gap 19, and the armature 10.
b, enters the S pole through the gap 20 and yoke 17. On the other hand, when a current is supplied to the solenoid 15 from a servo amplifier (not shown), magnetic lines of force are generated in the core part 10a of the flapper 1 and the housing 14 existing in the solenoid 15, so that the current is applied to the armature part 10b of the flapper 1. Depending on the direction, either a north pole or a south pole occurs. As a result, magnetic attraction and repulsion effects occur between the armature portion 10b and the yokes 16 and 17, and the flapper 1 tilts by an angle corresponding to the amount of current against the neutral holding force of the diaphragm 7. Become. This causes a difference in the opposing distance between each nozzle 3, 4 that constantly spouts fluid, for example, hydraulic oil, and this flapper 1, resulting in a difference in back pressure between these nozzles 3, 4, and this back pressure. The spool etc. are operated depending on the difference between the two.

In this way, the servo valve function is achieved, but since the opening 2 of the body 5 is sealed by the diaphragm 7, the hydraulic oil in the body 5 does not enter the electromagnetic actuator 6. This can be reliably prevented. Moreover, if the diaphragm 7 is used for sealing, there is no need to press fit a tube or the like into the actuator as in the conventional case, which simplifies assembly. Moreover, the flapper 1 is supported through the diaphragm 7, and the support portion is used as the hinge point 8. In other words, since the flapper 1 is elastically supported in a tiltable manner by the diaphragm 7, a special restoring spring is not required, and the number of parts can be reduced. Manufacturing is much easier than in the case where it is provided. The flapper 1 is made up of a distal end member 9 and a proximal end member 10, and the bolt portion 1 of the distal end member 9 is
By screwing the flapper 1 into the screw hole 12 of the proximal end member 10, the diaphragm 7 interposed between these members 9 and 10 can be compressed. There is also the effect that attachment to the diaphragm 7 is particularly simple and maintainability can be improved. That is, since the conventional tube and the diaphragm 7 of the present invention are parts that are constantly subject to deformation, cracks may occur if there is a defect in the internal structure. In such a case, it is very difficult to replace the tube with a new one in the conventional tube because the flapper is fixed inside the tube. If you unscrew it, this flap 1
can be easily removed from the diaphragm 7, and by reversing the operation, a new diaphragm 7 can be removed.
The flapper 1 can be easily attached to the.

Note that the minute swinging member is not limited to the flapper, and may be, for example, a jet pipe facing the receiving port.

Furthermore, it goes without saying that the structure of the electromagnetic actuator is not limited to that of the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention.

[Effect of idea]

Since the present invention has the above-described configuration, it not only can reliably prevent the fluid in the body from entering the electromagnetic actuator side, but also has a simple structure and easy manufacture, and prevents deterioration in performance. It is possible to reasonably reduce costs without causing problems, and since it is possible to easily attach and detach the minute swinging member and the diaphragm, it not only makes it easier to assemble, but also makes it easier to assemble the diaphragm. It is possible to provide a servo valve that can be easily replaced and that can greatly improve maintainability.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which FIG. 1 is a front sectional view, FIG. 2 is a plan view, FIG. 3 is a sectional view taken along the - line in FIG. 1, and FIG. 4 is a section A in FIG. 1. FIG. DESCRIPTION OF SYMBOLS 1...Minute swinging member (flapper), 2...Opening, 5...Body, 6...Electromagnetic actuator,
7... Diaphragm, 8... Hinge point, 9... Tip member, 10... Base end member, 11... Bolt part,
12...Screw hole part.

Claims (1)

[Scope of utility model registration request] A micro-oscillating member such as a flapper or a jet pipe that causes a pressure change in fluid by deflection of its tip; a body having an opening into which the distal end of the micro-oscillating member is inserted, and in which the fluid exists; , comprising an electromagnetic actuator attached to an open end of the body to deflect the micro-oscillating member, and a diaphragm sealing the opening of the body, and the micro-oscillating member is penetratingly supported by the diaphragm. The support portion is the hinge point of the micro-oscillating member, and the micro-oscillating member is composed of a distal end member located on the inner surface side of the diaphragm and a proximal end member located on the outer surface side. The servo valve is characterized in that a bolt portion protruding from the end surface of the tip member is screwed into a screw hole portion which penetrates the diaphragm and opens at the end surface of the base end member and is tightened.