JP2561669B2 - Floating mechanism of valve body in shutoff valve - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid cutoff valve that opens and closes a valve by driving a plunger to which a valve element is attached with a solenoid, and particularly when the operating output of the solenoid is small. The present invention relates to a floating mechanism of a valve element in a shutoff valve that prevents the valve element that blocks the nozzle from changing and reliably closes the nozzle.

<< Background of the Invention >> For example, in an impeller type flow meter, the diameter of a nozzle to be supplied to the impeller must be changed depending on the measurement range. In this type of flow meter, two nozzles, a small-diameter nozzle and a large-diameter nozzle, are arranged, and a solenoid-type shutoff valve provided for each nozzle according to the flow rate change is instructed by a command from a one-chip microcomputer for integrating counting. The nozzle diameter is changed by switching, and all the driving power is received from a long-term stable battery such as a lithium battery built into the flowmeter.

Therefore, a control system of this kind and a solenoid type shutoff valve driven by the control system are required to have a very low power consumption type, and it is necessary to use a light operation type solenoid.

Therefore, especially in such a solenoid type shut-off valve that operates with a light operation, the operating force of the solenoid is inevitably small, so that an extra force is not necessary as much as possible, and the valve body is reliably operated by the minimum necessary operating force. The structure must be able to open and close.

Generally, the element that determines the opening / closing operation of a solenoid shutoff valve is determined by the spring force of the spring that urges the valve body and the relative distance between the valve body and the nozzle. In addition, the valve body is reliably pressed against the nozzle, and in order to re-release the nozzle from this state, it is necessary to set so that the suction force of the solenoid is overcome by the spring pressure and the plunger is pulled into the solenoid.

As described above, by accurately setting the stroke amount of the valve element with respect to the nozzle, it is possible to obtain operational reliability even with a light-acting shutoff valve.

In addition, generally, the spring force is almost constant depending on the material and thickness of the spring, so by setting the stroke amount of the plunger with high accuracy and selecting a spring with an appropriate spring constant that matches the operating load of the solenoid, Even if the solenoid itself has a small operating load, a reliable opening / closing operation can be expected.

<< Problems to be Solved by the Invention >> However, as described above, when the operating load of the solenoid itself is extremely weak, the spring pressure must be necessarily weakened, which is not considered from the ordinary sense. The situation also appears.

In other words, when microscopically observing the contact state of the compression coil spring with respect to the valve body, the compression coil spring is inclining in a spiral shape, and when the compression coil spring is fully extended, the end of the spring contacts the valve body side at one point. In other words, instead of pushing up the entire valve body, the contact portion presses the valve body in a biased state.

Of course, such a state is negligible in a normal operating load type shutoff valve, but when the operating load is cut to the limit, this kind of deviation emerges as an important problem.

And, the problem is that the valve body does not abut uniformly on each part with the valve body blocking the nozzle due to the biased state of the spring pressure of this kind,
This means that the shielding performance cannot be maintained. Moreover, as described above, deformation is reduced while the operation of tens of thousands of times is repeated with the limited power of the power supply, the shielding performance is further deteriorated, and sticking due to partial deformation etc. Therefore, the partial abutment of the spring has a great influence.

The present invention has been made based on the above background, and its object is to provide a valve body with no bias even if the spring pressure of the compression coil spring toward the valve body is biased. The floating structure of the valve body in the shutoff valve is provided in which the contact force of the valve body with respect to the nozzle is averaged by the action of the force.

<< Means for Solving the Problems >> In order to achieve the above object, the present invention is directed to a nozzle, a valve element provided so as to face the nozzle, and a driving operation for separating the valve element from the nozzle. A plunger to
In a shut-off valve including a solenoid that drives the plunger in the axial direction and a compression coil spring that urges the valve body in a direction to bring the valve body into contact with the nozzle, the valve body includes:
A valve shaft connected to the tip of the plunger, a pressure receiving plate fixed to the valve shaft and receiving an urging force from the compression coil spring, a pivot bearing provided at the tip of the valve shaft, and the pivot. It is characterized in that it is provided with a pivot shaft that is swingably provided around a bearing and a valve body that is fixed to the pivot shaft and that is provided so as to face the nozzle.

<< Operation >> According to the above configuration, (a) the biasing force of the compression coil spring is transmitted from the pressure receiving plate to the valve shaft, and further to the valve body via the pivot bearing and the pivot shaft.

(B) Therefore, even if a biased force from the compression coil spring acts on the pressure receiving plate, the biased force does not directly act on the valve body.

(C) That is, even if a biased force is exerted on the pressure receiving plate from the compression coil spring, the valve body swings along the nozzle, and the valve body hits the nozzle uniformly.

<< Example >> An example of the present invention will be described below in detail with reference to the drawings.

1 to 3 show a first embodiment of the present invention,
FIG. 1 is an exploded perspective view of a shutoff valve unit to which the present invention is applied, FIGS. 2A and 2B are sectional views showing a state in which the shutoff valve unit is assembled to a valve housing, and FIG. 3 is a main part. It is an expanded sectional view.

In the figure, a shut-off valve unit 1 includes a flange 2, a solenoid 3 fixed to the back of the flange 2, a valve body 5 projecting to the surface side of the flange 2 and connected to a plunger 4 of the solenoid 3, Valve body 5 and flange 2
A compression coil spring 6 interposed therebetween, three spacer rods 7 at one end of the valve body 5 connected to the flange 2, and fixed to the other end of each spacer rod 7, and The nozzle 8 is arranged to face the valve body 5.

The flange 2 is fixed via a gasket 11 to a mounting hole 10 formed on the outside of the valve housing 9.

The solenoid 3 is a bidirectional solenoid, and its internal structure includes a yoke 12 coupled to the flange 2, a coil 14 on the inner circumference of the yoke 12 and wound around the outer circumference of a bobbin 13, and a bobbin 13. Of the permanent magnet 15 coaxially arranged on the upper side of the bobbin 13, the anvil 16 fixedly arranged in the lower part of the center hole of the bobbin 13 for receiving the plunger 4, and fitted in the center hole of the bobbin 13 and protrudingly arranged on the upper side. It is composed of a metal guide tube portion 17 made of metal.

Then, the magnetic field formed by the permanent magnet 15 is canceled or strengthened by the forward and reverse currents flowing through the coil 14 through the lead wire 14a drawn to the outside, and the projecting operation of the plunger 4 by the spring pressure of the spring 6 is performed. It is possible to perform both the pulling operation against the spring pressure.

The guide tube portion 17 is a guide jig for setting the gap between the plunger 4 and the bobbin 13 to be extremely small, and is designed to maximize the magnetic field acting on the plunger 4. .

A male screw portion 4a is cut on the top of the plunger 4, and the male screw portion 4a is screwed to a valve shaft 5a integrated with the lower portion of the valve body 5.

The reason why the plunger 4 and the valve shaft 5a are divided in this way is that the magnetic flux flows to the valve shaft 5a and the valve body 5 side by coupling the valve body 5 and the valve shaft 5a with the plunger 4 as a material made of a non-magnetic material. This is to prevent this and to minimize loss due to magnetic flux leakage.

The upper side of the spring 6 is in contact with the lower surface of the valve body 5, and the lower side is received by the spacer 18 located at the center of the flange 2.

The nozzle 8 has a cylindrical portion 19 having a through hole 19a at the center.
An O-ring 20 fitted to the outer periphery of the tubular portion 19, a flange portion 21 formed integrally with the lower peripheral edge of the tubular portion 19 and receiving the upper ends of the spacer rods 7, and a flange portion 21.
A ring-shaped magnetic shield plate 22 integrally connected to the lower surface of the valve body, and a nozzle portion 19b having a wedge-shaped cross section that abuts the upper surface of the valve body 5 is integrally formed on the lower peripheral edge of the flow hole 19a. It is protruding.

The partition wall 23, which is formed inside the valve housing 9 and divides the fluid into an upstream side and a downstream side, has a mounting hole 10 for the flange 2.
A nozzle fitting hole 24 is formed facing the
The tubular portion 19 is inserted through 24. The tubular portion 19 is O-
The ring 20 hermetically seals the fitting hole 24, and the flange portion 21 regulates the insertion position.

Reference numeral 25 in the figure denotes a sensor for detecting the operation of the solenoid 3 which is fixed to the yoke 12 of the solenoid 3 via an L-shaped mounting plate 26, and changes in magnetic flux associated with the operating state of the solenoid. Is detected and a detection signal is sent to a control system (not shown) through the lead wire 25a.

In the above configuration, the valve body 5 is swingable above the pressure receiving plate 51 and the pressure receiving plate 51 integrated with the upper end of the valve shaft 5a by screw connection, as shown in an enlarged view in FIG. And a valve body 52 disposed in the.

On the upper surface of the valve body 52, a recess 52 concentric with the center thereof is formed.
a is formed, and a valve rubber 53 is attached to the upper surface of the valve body 52 so as to cover the upper surface of the recess 52a.
The concave portion 52a has a structure in which a deformation margin in a state where the valve rubber 53 is in contact with the nozzle portion 19b is absorbed toward the 19b.

A pivot shaft 54 projects from the center lower part of the valve body 52, and its tip is engaged with a pivot bearing 55 provided at the uppermost part of the valve shaft 5a through a center hole 51a of the pressure receiving plate 51. . The center hole 51a of the pressure receiving plate 51 has the pivot shaft 54
Has a diameter larger than that of the pivot shaft 54 so that it can be inserted with a predetermined margin, and the pivot shaft 54 is retained by a retaining flange 54a provided at the lower portion thereof.

As described above, the valve body 52 is in a state of being swingably connected to the upper side of the pressure receiving plate 51 about the pivot bearing 55.

When the shut-off valve unit 1 configured as described above is attached to the valve housing 9, as shown in FIGS. 2 (a) and 2 (b), the stroke of the valve body 5 with respect to the nozzle 8 is the length of the spacer rod 7. The accuracy is determined by the accuracy of 1 and is always constant regardless of the manufacturing accuracy of the housing 9. Therefore, from the released state of the nozzle 8 shown in FIG.
It is possible to reliably perform the closed state shown in (1) or vice versa with a minimum output.

Further, when the valve body 5 is projected, the upper end portion of the compression coil spring 6 presses the pressure receiving plate 51 at one point,
The pressure receiving plate 51 is pressed in a biased state, and this pressing force becomes a force for pressing the center of the valve body 52 from the pivot bearing 55 through the pivot shaft 54, and the valve rubber 53 of the valve body 52 causes the nozzle portion 19 to move.
In the state of being in contact with the tip of b, the pressing force is self-corrected so as to be averaged, so that the contact is made completely.

 FIG. 4 shows a second embodiment of the present invention.

In the figure, a screw (pivot shaft) 60 that constitutes a ball joint shaft is provided on the lower portion of the valve body 52, and the screw portion penetrates the center hole 51a of the pressure receiving plate 51 with a predetermined gap to form a spherical shape. A screw head portion 60a is swingably fitted to a ball joint bearing portion (pivot bearing) 61 formed on the valve shaft 5a.

Even with this structure, the valve rubber 53 is similar to the above
The valve body 52 is self-corrected so that the nozzle body 19 abuts the nozzle portion 19a evenly when the nozzle portion 19 abuts on the nozzle portion 19a.

<Effect> As described in detail in each of the above embodiments, according to the present invention, even if the tip of the compression coil spring presses the pressure receiving plate at one point, the pressing force is not the same as the pivot bearing and the pivot shaft. It is transmitted to the valve body via the valve body, and the portion on the valve body side abuts on the nozzle in a swingable state, so that when the valve body abuts on the nozzle, the valve body will hit the nozzle uniformly. Self-corrected to.

That is, even if the contact state of the compression coil spring with respect to the valve body is uneven, the contact pressure of the valve body with respect to the nozzle can be averaged. Therefore, the valve body can be uniformly brought into contact with the nozzle, and even when the operation output of the solenoid is small, the nozzle can be reliably closed by the compression coil spring having a small biasing force.
Therefore, it is suitable as a mechanism of a solenoid cutoff valve that repeats long-term operation using a limited power source.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention, FIG. 1 is an exploded perspective view of a shutoff valve unit to which the present invention is applied, and FIGS. 2A and 2B are the shutoff valve unit. Is a sectional view showing a state in which is assembled to a valve housing, FIG. 3 is an enlarged sectional view of an essential part, and FIG. 4 is an enlarged sectional view of an essential part showing a second embodiment of the present invention. 1 ... Shut-off valve unit, 2 ... Flange 3 ... Solenoid, 4 ... Plunger 5 ... Valve body, 5a ... Valve shaft 6 ... Compression coil spring, 8 ... Nozzle 19b ... Nozzle part, 51 ... … Pressure plate 52 …… Valve body, 54 …… Pivot shaft 55 …… Pivot bearing, 60 …… Screw (ball joint shaft) 61 …… Ball joint bearing

 ─────────────────────────────────────────────────── ─── Continuation of the front page (73) Patent holder 999999999 Yazaki Sogyo Co., Ltd. 1-4-2 Mita, Minato-ku, Tokyo (72) Inventor Teruhisa Kojima 407 Weir, Tama-ku, Kawasaki-shi, Kanagawa (72) Inventor Masayuki Komaki 1188 Oshidate, Inagi-shi, Tokyo (72) Inventor Hiroshi Morita 5-1, Hirano-cho, Higashi-ku, Osaka-shi, Osaka Within Osaka Gas Co., Ltd. (72) Takatoshi Murakami 5-1-1, Hirano-cho, Higashi-ku, Osaka, Osaka In Osaka Gas Co., Ltd. (72) Inventor Yasushi Sato 19-18 Sakurada-cho, Atsuta-ku, Nagoya-shi, Aichi Toho Gas Co., Ltd. (72) In-house Yasuto No. 19-18 Sakurada-cho, Atsuta-ku, Nagoya-shi, Aichi Incorporated (72) Inventor Tetsuhiko Matsushima 23 Minamikashima, Futatama-cho, Tenryu-shi, Shizuoka Prefecture (72) Inventor Kazuo Suzuki 23 Minami-kashima, Futamachi-cho, Tenryu-shi, Shizuoka Prefecture (56) References Special Akira 61-201966 (JP, A) JitsuHiraku Akira 62-54373 (JP, U)

Claims (1)

(57) [Claims] 1. A nozzle, a valve body provided so as to face the nozzle, a plunger for driving the valve body to separate from and contact with the nozzle, a solenoid for axially driving the plunger, and In a shutoff valve including a compression coil spring that biases a valve body in a direction of abutting the nozzle, the valve body is fixed to the valve shaft and a valve shaft connected to a tip portion of the plunger. A pressure receiving plate which receives a biasing force from the compression coil spring, a pivot bearing provided at a tip end portion of the valve shaft, a pivot shaft swingably provided around the pivot bearing, and the pivot shaft. A floating mechanism for a valve element in a shutoff valve, comprising: a valve body that is fixed and is provided so as to face the nozzle.