JPS6114648Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a hydraulic servo valve device that switches hydraulic fluid by driving a spool valve with an electromagnetic force motor, and in particular to a direct-acting hydraulic servo valve. Regarding equipment.

[Conventional technology]

Conventionally, this type of direct-acting electro-hydraulic servo valve device operates the actuator by switching the hydraulic fluid, but it is difficult to operate this servo valve device or actuator in a high-temperature atmosphere. In this case, a water-glycol-based flame-retardant hydraulic fluid is used as the hydraulic fluid.

[Problem that the invention attempts to solve]

However, such a water-glycol-based flame-retardant hydraulic fluid is corrosive, so if this flame-retardant hydraulic fluid leaks into the force coil side of a force motor, which is an electrical component, it may cause corrosion. Due to this, the electrical insulation of the force coil deteriorates, causing failure.

Therefore, it is conceivable to partition the spool valve side space and the force motor side space using an elastic flexible member such as a bellows, but with such a method, depending on how the elastic flexible member is attached, the pressure receiving area may be limited. In this case, it is necessary to provide an appropriate atmospheric pressure communication path in the above space.

It is also possible to cool the force coil with a non-corrosive liquid such as silicone oil, which is different from the working fluid, but in this case too, the flame-retardant working fluid and the non-corrosive cooling fluid are mixed. Liquid-tight partitioning is performed using a flexible membrane member to prevent them from coming into contact with each other.

In this way, the flexible membrane member can be used to partition the accommodation space on the force motor side and the accommodation space on the adjacent spool valve side, but conventional direct-acting electro-hydraulic servo valve devices Since the housing space on the force motor side is configured as an open housing space with an opening formed in the upper part, the servo valve device can only be installed with the opening positioned at the top. There is a problem in that the mounting manner of the servo valve device is limited.

In addition, since the housing space on the force motor side is configured as an open housing space,
There is a problem that foreign matter such as dust enters from the outside, and there is also a problem that the non-corrosive liquid needs to be replenished because there is a risk that the liquid level will drop due to evaporation of the non-corrosive liquid.

The present invention attempts to solve these problems, and uses flexibility to partition the housing space on the force motor side and the housing space on the spool valve side, reducing the pressure receiving area as much as possible. While aiming for simplification, the housing space on the force motor side is made into a closed type, and a gas chamber is formed within the sealed housing space, thereby increasing the degree of freedom in mounting the device, and
It is an object of the present invention to provide a hydraulic servo valve device which prevents dust from entering from the outside and hardly requires liquid replenishment.

[Means for solving problems]

Therefore, the hydraulic servo valve device of the present invention
In order to change the hydraulic oil, an electromagnetic force motor that can directly reciprocate the spool valve is provided, and a sealed storage space on the force motor side and an adjacent storage space on the spool valve side connect these storage spaces. A non-corrosive liquid for cooling the force motor is sealed in the airtight storage space on the force motor side, which is liquid-tightly partitioned in a narrow gap using a flexible membrane member, and the temperature of the liquid is It is characterized by being filled with gas to absorb the amount of expansion and contraction caused by changes.

[Effect]

In the above-mentioned hydraulic servo valve device of the present invention, there is a narrow gap connecting the accommodation space on the force motor side and the accommodation space on the spool valve side, and these accommodation spaces are liquid-tightly partitioned by a flexible membrane member. Therefore, the pressure receiving area of the flexible membrane member can be reduced. This eliminates the need for a mechanism for communicating the storage space with the atmosphere, and simplifies the structure.

Furthermore, a non-corrosive cooling liquid is sealed in the closed storage space on the force motor side, and the force motor can be cooled by this liquid. Even if the temperature of the non-corrosive liquid rises during this cooling and the occupied volume of the non-corrosive liquid changes, this change is absorbed by the sealed gas portion in the hermetically sealed storage space on the force motor side. Ru.

〔Example〕

A direct-acting electro-hydraulic servo valve device according to an embodiment of the present invention will be explained below with reference to the drawings. Fig. 1 is a longitudinal sectional view thereof, and Fig. 2 is an enlarged view of one end of the spool valve. 3 is an enlarged partial longitudinal sectional view showing the vicinity of the other end of the spool valve, in which the magnetic field generation mechanism 1
is composed of a magnet 2, a yoke 3, and a pole piece 4, and an annular gap 5 is formed between the yoke 3 and the pole piece 4.

Therefore, a magnetic field space is formed in this gap 5, and a DC magnetic field is generated in this gap 5.

In addition, the force coil 6 for driving the spool valve is
It is inserted into the gap 5, and this force coil 6
is supported by a short cylindrical force coil boss portion 7 via an arm member 7a.

Further, a spool valve 9 inserted into a valve casing 8 constituting the main body is attached to the force coil boss portion 7, and therefore the force coil 6 is supplied with alternating current from a power source (not shown). In particular, when it generates electromagnetic force by interaction with the magnetic field in the gap 5 and reciprocates by itself,
The spool valve 9 is configured to be driven back and forth via the force coil boss portion 7.

In this way, the force coil 6 supported by the magnetic field generation mechanism 1 and the force coil boss portion 7
When the spool valve 9 is reciprocated by the electromagnetic force motor FM consisting of Supply and discharge are performed alternately.

Note that the ports C ₁ and C ₂ communicate with the first and second oil chambers (not shown) of the actuator (not shown), which are separated from each other by a piston, so that the hydraulic oil can flow through each oil chamber of the actuator. It alternately enters and exits the chamber to operate the actuator.

Further, although not shown, a supply port communicating with a hydraulic oil supply source such as an oil pump and a return port communicating with a hydraulic oil return portion such as an oil reservoir are formed in the valve casing 8.

By the way, as shown in FIGS. 1 and 2, the gap 5 into which the force coil 6 is inserted, the magnet 2 and the arm member 7a are enclosed, and a non-corrosive liquid L for cooling such as the force coil 6 such as silicone oil is enclosed. A first receiving space S ₁ of the mold and a second receiving space adjacent to this first receiving space S ₁ on the side of the spool valve 9 containing a flame-retardant but not non-corrosive hydraulic oil such as a water-glycol system. An elastic flexible membrane member 10 is provided as a flexible membrane member that liquid-tightly partitions the two housing spaces S ₂ into a narrow annular gap 23 connecting these housing spaces S ₁ and S ₂ .

As shown in FIG. 2, this elastic flexible membrane member 10 has one end formed as a large-diameter peripheral edge 10a, and the other end formed as a small-diameter peripheral edge 10a.
b, and the middle part thereof is formed as a folded part 10c which is folded back inward at a narrow annular gap ₂₃ connecting the first accommodation space _S1 and the second accommodation space S2. .

Further, a first mounting plate 11 formed with an annular groove 11a and a second mounting plate 11 aligned with the first mounting plate 11 are provided.
The mounting plate 12 is attached to the valve casing 8,
It is detachably attached with screws 8a, and a force coil boss 7 that fits into the end of the spool valve 9 is loosely fitted into the center holes 11b and 12a of each of the mounting plates 11 and 12.

The large diameter peripheral edge 10a of the elastic flexible membrane member 10 is
Fitting into the groove 11a of the mounting plate 11, the mounting plate 1
1 and 12, and attach the same mounting plate 1.
1 and 12 in a fluid-tight and detachable manner, and the small diameter peripheral edge 1 of the elastic flexible membrane member 10
0b is sandwiched between the spool valve side end surface of the force coil boss section 7 and the presser member 13 that fits into this end surface.
It is fluid-tightly and removably attached to the

Note that the intermediate folded portion 1 of the elastic flexible membrane member 10
As described above, 0c is located in the annular gap 23 between the center hole 11b of the first mounting plate 11 and the force coil boss 7, so that the pressure receiving area of the elastic flexible membrane member 10 is reduced. can do.

In this way, the elastic flexible membrane member 10 is placed between the mounting plates 11 and 12 and the force coil boss portion 7.
Since it is installed in a liquid-tight and removable manner with a small pressure-receiving area, it is easy to install and remove.
Moreover, after installation, the first and _second storage spaces can be installed without providing an atmospheric communication path etc.
The accommodation spaces S ₁ and S ₂ can be partitioned off from each other in a liquid-tight manner.

As mentioned above, a non-corrosive liquid L such as silicone oil is sealed in this sealed first accommodation space S ₁ , and the upper part of the space containing the magnet 2 of this accommodation space S ₁ is is filled with gas (air) for absorbing the amount of expansion and contraction of the liquid L due to temperature changes. That is, a gas chamber G is formed in contact with the liquid surface of the liquid L.

The amount of liquid L sealed in this accommodation space _S1 is such that the force coil 6 is always immersed in the liquid L no matter what attitude the device takes.

By the way, one end of the spool valve 9 is attached to the presser member 1.
3 and the force coil boss portion 7, the first coil spring 15 supported by the spring receiver 14 with the pole piece 4 biases the spool valve 9 to the right in FIG. The other end is biased to the left in FIG. 1 by a second coil spring 17 supported by the valve casing 8 via a spring bearing 16 shown by a dotted line so as to be aligned with the center axis of the second end. This allows the spool valve 9 to maintain its neutral position when it is at rest.

The manner in which the second coil spring 17 is supported on the valve casing 8 is as follows. That is, as shown in FIGS. 1 and 3, an adapter 18 fixed to the valve casing 8 has a male screw 19 for adjusting the spring force.
is screwed together, and the second coil spring 17 is supported via a spring receiver 20 that makes point contact with the end face of this male screw 19 so as to be aligned with the central axis of the male screw 19, thereby supporting the second coil spring 17. 17 is supported by the valve casing 8 via the spring receiver 20, the male thread 19, and the adapter 18.

At this time, since the spring receiver 16 is in point contact with the other end surface of the spool valve 9, and the spring receiver 20 is in point contact with the end surface of the male thread 19, the rotational force of the male thread 19 during assembly will cause Second coil spring 17
It is possible to sufficiently prevent the generation of twisting force or the generation of axially deviated force, and the spool valve 9 can operate smoothly.

Further, the spring receiver 16 that makes point contact with the other end surface of the spool valve 9 has a shaft 16a formed with a point contact end, and a receiving surface of the second coil spring 17, and surrounds the second coil spring 17. cylindrical member 16b
and a presser member 1 that fits into the end surface of the cylindrical member 16b.
6c, and between the cylindrical member 16b and the presser member 16c, there is a small diameter peripheral edge 21a of an elastic flexible membrane member 21 having approximately the same shape as the aforementioned elastic flexible membrane member 10. It is being pinched.

Further, the large diameter peripheral edge 2 of the elastic flexible membrane member 21
1b is an annular groove 18 formed in the adapter 18;
a, and is held between the adapter 18 and the mounting plate 22, thereby forming a third housing space _S3 surrounding the second coil spring 17, etc., and a third housing space _S3. The fourth accommodation space _S4 filled with the working fluid on the adjacent spool valve side is partitioned off by the elastic flexible membrane member 21 in a fluid-tight and removable manner.

In this case as well, the attachment and detachment of the elastic flexible membrane member 21 becomes easy, and after attachment, the third
And the fourth accommodation spaces S ₃ and S ₄ can be partitioned off from each other in a liquid-tight manner.

With the above configuration, to operate this device,
First, alternating current may be supplied to the force coil 6 from a power source (not shown). This allows the spool valve 9
is reciprocated, so the hydraulic oil is switched by this spool valve 9, and the hydraulic oil is alternately supplied and discharged as shown by the solid line arrow and the dotted line arrow in Fig. 1, respectively. port
Actuators connected to C ₁ and C ₂ can be operated.

At this time, the closed storage space S ₁ on the force motor FM side and the storage space on the spool valve 9 side
S ₂ is a narrow gap 23 that connects these storage spaces S ₁ and S ₂ and is fluid-tightly partitioned by the elastic flexible membrane member 10. The area can be reduced. This eliminates the need to communicate the accommodation space _S2 and the like with the atmosphere, simplifying the structure.

In addition, this elastic flexible membrane member 10 prevents the working fluid from leaking to the force motor FM side, and the non-corrosive cooling liquid L in the sealed housing space _S1 can sufficiently cool the force motor FM. can do. Even if the temperature of this non-corrosive liquid L rises during this cooling and the capacity occupied by this non-corrosive liquid L in the hermetically sealed accommodation space _S1 increases, the gas chamber G of the hermetically sealed accommodation space _S1 also increases. The change is absorbed by the part of Therefore, even if the accommodation space _S1 is of a sealed type, the amount of expansion and contraction of the non-corrosive liquid L due to temperature changes can be absorbed.

Furthermore, since the storage space S ₁ is a sealed type, no matter what position the device is installed in, there will be no leakage, which increases the degree of freedom in installing the device. This eliminates the need for liquid replenishment as the liquid L evaporates.

In addition, the accommodation spaces S ₃ and S ₄ are also occupied by the elastic flexible membrane member 2.
Since the second coil spring 1 is liquid-tightly partitioned, leakage of hydraulic oil can be prevented.
7 grade corrosion can be sufficiently prevented.

Furthermore, since the spring receiver 16 is in point contact with the other end surface of the spool valve 9, and the spring receiver 20 is in point contact with the end surface of the male thread 19, the male thread 1
It is possible to sufficiently prevent the second coil spring 17 from being subjected to torsion force or from being deviated in the axial direction due to the rotational force of the elastic membrane members 10 and 21. This prevents screws from forming and also ensures smooth operation of the spool valve 9.

The large-diameter peripheral edge portions 10a, 21b of the elastic flexible membrane members 10, 21 are fitted into annular grooves 11a, 18a formed in the mounting plates 11, 12 and the adapter 18, so that the elastic flexible membrane members 10, 21 are not easily attached to the mounting plates 11, 12 or the mounting plate 12. Plate 22 and adapter 1
The small diameter peripheral edge portions 10b and 21a are attached to the force coil boss portion 7, the presser member 13, and the cylindrical member 16b.
Since the elastic flexible membrane member 1 is mounted so as to be held between the
0, 21 can be easily attached and removed, and as mentioned above, the housing spaces S ₁ , S ₂ ; S ₃ , S ₄ can be partitioned off in a sufficiently liquid-tight manner.

[Effect of idea]

As described in detail above, according to the hydraulic servo valve device of the present invention, the accommodation space S ₁ on the force motor FM side and the accommodation space S ₂ on the spool valve 9 side are connected to the accommodation spaces S ₁ and S _2. Since the connecting narrow gap 23 is liquid-tightly partitioned by the flexible membrane member 10, the pressure-receiving area of the flexible membrane member 10 can be reduced, thereby reducing the storage space _S2 , etc. There is no need for communication with the atmosphere, and the structure can be simplified.

Furthermore, in the hydraulic servo valve device of the present invention, the accommodation space _S1 on the side of the electromagnetic force motor FM is configured as a closed accommodation space, and in this sealed accommodation space _S1 , the force motor FM is
A simple configuration in which a non-corrosive liquid L for cooling the FM is sealed and a gas is also sealed to absorb the amount of expansion and contraction of the liquid L due to temperature changes, increasing the degree of freedom in mounting the device. is possible,
This allows you to install the device in any position.
This has the advantage that the force motor FM can be efficiently cooled. In addition, this closed storage space
Dust does not enter into S ₁ from the outside, and furthermore, the liquid L evaporates and its liquid level decreases, eliminating the need for frequent liquid replenishment.

[Brief explanation of the drawing]

The figures show a direct-acting electro-hydraulic servo valve device as an embodiment of the present invention. Fig. 1 is a longitudinal sectional view thereof, and Fig. 2 is an enlarged view of one end of the spool valve. 3 is a partial longitudinal sectional view showing an enlarged view of the vicinity of the other end of the spool valve. 1... Magnetic field generation mechanism, 2... Magnet, 3... Yoke, 4... Pole piece, 5... Annular gap, 6
...Force coil for driving spool valve, 7...Force coil boss part, 7a...Arm member, 8...
...Valve casing, 8a...Screw, 9...Spool valve, 10...Elastic flexible membrane member as a flexible membrane member, 10a...Large diameter peripheral edge of elastic flexible membrane member 10, 10b...Small diameter peripheral edge of the elastic flexible membrane member 10, 10c...Intermediate folded portion of the elastic flexible membrane member 10, 11...First mounting plate, 11a...
... Annular groove, 11b ... Center hole, 12 ... Second mounting plate, 12a ... Center hole, 13 ... Pressing member,
14... Spring holder, 15... First coil spring, 1
6... Spring bearing, 16a... Shaft, 16b... Cylindrical member, 16c... Pressing member, 17... Second coil spring, 18... Adapter, 18a... Annular groove,
19...Male screw for adjusting spring force, 20...Spring holder,
21...Elastic flexible membrane member, 21a...Small diameter circumferential edge of the elastic flexible membrane member 21, 21b...Large diameter circumferential edge of the elastic flexible membrane member 21, 22...Mounting plate, 23
...Gap, FM...Electromagnetic force motor,
C ₁ , C ₂ ... Port, L ... Non-corrosive liquid, S ₁ ...
...first storage space as a liquid-tight storage space, S ₂ ... second storage space, S ₃ ... third storage space, S ₄ ... fourth storage space, G...
gas chamber.

Claims (1)

[Scope of utility model registration request] In order to change the hydraulic oil, we use an electromagnetic force motor that can directly drive the spool valve back and forth.
The sealed storage space on the force motor side and the storage space on the spool valve side adjacent to the same space are liquid-tightly partitioned using a flexible membrane member in a narrow gap connecting these storage spaces. A non-corrosive liquid for cooling the force motor is sealed in a sealed storage space on the force motor side, and a gas is also filled in the liquid to absorb the amount of expansion and contraction of the liquid due to temperature changes. Pressure servo valve device.