JP3173194B2 - Solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve which can secure a sufficient stroke and can be operated with a small current.

[0002]

2. Description of the Related Art Conventionally, a solenoid used for a pilot type diaphragm valve has an electromagnetic coil housed in a yoke, and a cylindrical plunger guide is inserted into a vertical hole provided at the center of the electromagnetic coil. A pole core is fitted and fixed on the upper part of the guide, and a plunger is inserted to slide in the plunger guide toward the pole core.

In such a structure, an outer shell of a solenoid is formed by a yoke, a front bottom plate thereof, and a pole core fixing plate to which a pole core is fixed, and a plunger is subjected to a magnetic attraction effect by an electromagnetic force generated by energizing an electromagnetic coil. It is configured so as to function as a solenoid by operating so as to be able to advance and retreat from the insertion hole of the yoke front bottom plate.

[0004]

However, the above-mentioned solenoid still has the following problems to be solved.

That is, as described above, the yoke is arranged on the outer periphery of the electromagnetic coil, the pole core is fixed to one end of the yoke, and the plunger is inserted at the other end.

Accordingly, the force acting on the plunger is affected only by the magnetic flux passing between the pole core and the plunger. That is, in order to drive the plunger with a very small current, as in the case of operating a solenoid with a drive source requiring low power consumption such as a dry battery, the magnetic resistance between the pole core and the plunger must be reduced. To this end, it is conceivable to reduce the distance between the pole core and the plunger or to increase the cross-sectional area between the pole core and the plunger. However, reducing the distance between the pole core and the plunger shortens the stroke.On the other hand, increasing the cross-sectional area between the pole core and the plunger increases the overall shape of the solenoid. It has been difficult to realize a small solenoid that can be driven and has a large stroke.

An object of the present invention is to provide a solenoid valve which can solve the above-mentioned problems.

[0008]

According to the present invention, there is provided a bi-rotor type diaphragm valve having a pilot valve hole provided in a diaphragm for opening and closing a main valve hole of a valve, and a pole core fixed to one end on an inner peripheral side of an electromagnetic coil. It consists of a solenoid with a plunger inserted in the other end so that it can move forward and backward, and
In a solenoid valve which opens and closes a pilot valve hole with the tip of a plunger to open and close a main valve hole of the valve,
The plunger is composed of a main plunger and a sub-plunger arranged in series in an electromagnetic coil, so that both plungers can be attracted while the electromagnetic coil is excited, and the tip of the sub-plunger can contact the diaphragm. Connecting the base end of the sub-plunger operating rod, linked with the large stroke movement of the diaphragm due to the small stroke movement of the main plunger,
The present invention relates to a solenoid valve characterized in that a sub-plunger and a main plunger can be moved by a large stroke.

According to the present invention, an auxiliary return spring is disposed between the main plunger and the auxiliary plunger, and a main return spring is interposed between the auxiliary plunger and the pole core. ₁ and the relationship between the spring constant k ₂ of the sub-return spring, and the k ₂ ≦ k ₁ that,
That a permanent magnet is arranged at the rear of the pole core; and
Instead of the pole core, a cylindrical plunger guide is inserted concentrically into the vertical hole of the electromagnetic coil, one end of the plunger guide is closed, and the plunger is inserted into the other end side so as to be able to advance and retreat. Has features.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a solenoid valve B according to the present invention will be described in detail based on an embodiment shown in the accompanying drawings.

(Embodiment 1) FIG. 1 shows the internal structure of a solenoid valve B having a solenoid A, and particularly shows a closed state in which a plunger 25 (described later) is projected when the valve is closed. .

FIG. 2 shows an initial state (transient state) of energization of the solenoid valve B, and FIG. 3 shows an open state (final state) of the solenoid valve B.

First, the overall structure of the solenoid A will be described with reference to FIG. 1. The electromagnetic coil 11 has a substantially cylindrical shape in which upper and lower flanges 11a and 11b are integrally attached to upper and lower outer peripheral surfaces. It comprises a bobbin 11c and an electromagnetic coil body 11d wound around the bobbin 11c. And the electromagnetic coil 11
A vertical hole 12 is formed therein.

On the other hand, a yoke 10 is provided on the outer periphery of the electromagnetic coil 11, and in this embodiment, the yoke 10 is
a, and upper and lower end plates 10b and 10c provided above and below it.

Further, the yoke 10 is provided integrally with irregular magnetic field forming inner peripheral portions 10d and 10e extending downward and upward around openings formed in the central portions of the upper and lower end plates 10b and 10c, respectively. These irregular magnetic field forming inner peripheral portions 10d and 10e are inserted into upper and lower portions of the vertical hole 12 of the electromagnetic coil 11, respectively.

The lower end plate 10c of the yoke 10 is
It is mounted on the upper surface of a back chamber forming plate 21 of a diaphragm valve C described later. A central portion of the back chamber forming plate 21 is provided with an opening 22, and a lower end of a long cylindrical plunger guide 23 is integrally protruded from an upper peripheral edge of the opening 22. It extends inside the upper and lower irregular magnetic field forming inner peripheral portions 10d and 10e formed inside the yoke 10.

In the plunger guide 23, a main plunger 25 having a valve body 24 at a lower end, a sub-plunger 26, a pole core 27, and a permanent magnet 28 are arranged in this order from bottom to top. Have been.

A receiving plate 29 caulked and fixed to the upper end plate 10b of the yoke 10 is disposed above the permanent magnet 28, while a sub-plunger 26 is provided between the main plunger 25 and the sub-plunger 26. A return spring 30 is provided, and a main return spring 31 is interposed between the sub-plunger 26 and the pole core 27.

[0019] The relationship between the spring constant k ₂ of the spring constant k ₁ and the sub-return spring 30 of the main return spring 31 is a k ₂ ≦ k _1.

With this configuration, in the initial state (or at the time of water stoppage), when the electromagnetic coil 11 is not energized, the valve body 24
Will close the pilot valve hole 48 provided at the center of the diaphragm 45 of the diaphragm valve C.

Further, the sub-plunger 26 extends the sub-plunger operating rod 32 from the lower surface thereof toward the diaphragm valve C, and since k ₂ ≦ k ₁ , the tip of the sub-plunger operating rod 32 is the rear surface of the diaphragm 45. As described later, the sub-plunger 26 can move upward in conjunction with the upward movement of the diaphragm 45, as will be described later.

Next, the construction of the pilot type diaphragm valve C of the solenoid valve A will be described with reference to FIG.

In the figure, reference numeral 40 denotes a valve box, which is provided with an inflow passage 41 and an outflow passage 42 which are connected to the primary pipe and the secondary pipe, respectively. In the valve case 40, a main valve hole 43 is formed between the inflow path 41 and the outflow path 42, and a valve main seat 44 is formed on the periphery of the upper end opening of the main valve hole 43.

On the main valve seat 44, a diaphragm 45 also serving as a main valve body for opening and closing the main valve hole 43 is disposed so as to be freely movable.

A diaphragm back chamber 46 is formed above the diaphragm 45. The diaphragm back chamber 46 is connected to an outflow passage through an orifice 47 provided on the periphery of the diaphragm 45.
Communicates with 42. Note that the diaphragm back chamber 46 is substantially formed by the diaphragm 45 and the back chamber forming plate 21.

Reference numeral 48 denotes a pilot valve hole formed in the diaphragm 45, which connects the diaphragm back chamber 46 with the outflow hole 42.

As described above, the valve element 24 provided at the tip of the main plunger 25 of the solenoid A is opposed to the upper side of the pilot valve hole 48, and the pilot valve hole is moved by the forward / backward movement of the main plunger 25. 48 can be opened and closed.

Reference numeral 49 denotes a cleaning pin inserted through the orifice 47.

Next, the operation of the solenoid valve B having the above configuration will be described with reference to FIGS.

First, the operation of opening the solenoid valve B in the closed state shown in FIG. 1 will be described.

When the electromagnetic coil 11 is energized, an irregular magnetic field b is generated in addition to the main magnetic field a as shown in FIG. And
Due to the irregular magnetic field b, the main plunger 25 is first attracted and attracted to the sub-plunger 26 (FIG. 2).

Since the space between the main plunger 25 and the sub-plunger 26 is formed in the portion where the magnetic field convergence is the highest and with a short stroke, the suction force is effectively used, and a relatively weak suction force is sufficient. .

The pilot valve hole 48 is opened by the minute movement of the main plunger 25 in the first stage, and the diaphragm back chamber is opened.
The water pressure in the diaphragm back chamber 46 decreases due to the communication between the 46 and the outflow passage 42, and a pressure difference occurs between the water pressure in the diaphragm back room 46 and the water pressure in the inflow passage 41, and the diaphragm 45 rises significantly, The inflow channel 41 and the outflow channel 42 communicate with each other through the main valve hole 43.

By the way, as described above, the sub-plunger
Since the tip of the plunger operating rod 32 provided on the lower surface of the diaphragm 26 is in contact with or close to the back surface of the diaphragm 45, the force of the hydraulic pressure received by the diaphragm 45 due to the opening of the main valve hole 43 pushes the sub-plunger operating rod 32. Effectively used as a lifting force, the sub-plunger operating rod 32 can also be raised significantly with a large rise of the diaphragm 45, and by this raising, the sub-plunger operating rod 32 is integrally connected to the base end of the operating rod 32. Plunger
26 also rises significantly with sufficient lifting force against the urging force of the main spring 31.

Accordingly, the main plunger 25 similarly rises significantly in conjunction with the great rise of the sub-plunger 26, and the solenoid valve B shifts to the open state (FIG. 2 → FIG. 3).

At this time, the force of the water pressure received by the diaphragm 45 due to the opening of the main valve hole 43 is effectively used as the pushing-up force of the plunger operating rod 32. You just have to move it. This valve opening force can also be used as a plunger valve opening holding force.

Thereafter, both plungers 25 and 26 are
Is attracted to the pole core 27 and latched. As a result, the diaphragm valve C maintains the open state (FIG. 3).

Therefore, it is not necessary to energize the electromagnetic coil 11.

On the other hand, the operation of setting the solenoid valve B in the closed state shown in FIG. 3 to the open state shown in FIG. 1 will be described.

When the electromagnetic coil 11 is energized in a direction in which the latches of the plungers 25 and 26 are released, the magnetic force of the permanent magnet 28 is canceled by the magnetic force of the electromagnetic coil 11. , 26 descend, closing the pilot valve hole 48 of the diaphragm valve C.
As a result, the diaphragm 45 starts to descend.

At this time, the amount of water flowing into the diaphragm back chamber 46 gradually decreases due to the effect of the restriction of the cleaning pin 49, and thereafter the main valve hole 43 is gradually closed.

Thus, in addition to the conventional main magnetic field a,
Since the operation of attracting the plunger 25 is also performed by the irregular magnetic field b, the solenoid valve B can be opened and closed only by applying a small current to the electromagnetic coil 11, thereby saving power.

When the same current as in the prior art is applied to the electromagnetic coil 11, even if the gap between the main plunger 25 and the sub-plunger 26 is sufficiently long, the sub-plunger 2
6, since the main plunger 25 can be sucked, the plunger 25 can secure a sufficient stroke.
Therefore, the flow rate can be increased by the solenoid valve B.

Further, in the present invention, the plunger is formed of two series plungers, that is, a main plunger 25 and a sub-plunger 26 to which the main plunger 25 is attracted in an excited state. Is linked to a large rise of the diaphragm 45 via the sub-plunger operating rod 32. Therefore, a small current needs to be supplied to the electromagnetic coil 11 to raise the main plunger 25 by a small distance, so that power saving can be achieved. Further, since the sub-plunger 26 can be raised significantly by utilizing the large rise of the diaphragm 45, the stroke of the plungers 25, 26 can be further lengthened, and from this aspect, the flow rate can be increased by the solenoid valve B. be able to.

FIG. 6 shows the manner in which the electromagnetic coil 11 is energized. As shown in the figure, in the present embodiment, it is only necessary to apply a voltage once each at the time of valve opening and at the time of valve closing, and power saving is achieved from this aspect.

Further, in this embodiment, since the permanent magnet 28 is provided above the pole core, parts can be shared with a permanent magnet described later (FIG. 4), which can be used properly according to the application and can be manufactured at low cost.

Further, the permanent magnet 28 → the inner peripheral portion for forming an irregular magnetic field
10d → Due to the demagnetization effect of the closed loop of the ball core 27, even if a strong magnet is used as the permanent magnet 28, a defect in that case, that is, even when a current is flowing due to the magnetic field created by the permanent magnet 28, When a force that pulls the plunger is applied and the permanent magnet 28 is strong, a problem that the ball core 27 is attracted to the plunger and the water keeps flowing out can be solved.

Further, FIGS. 4 and 5 show modifications of the solenoid A described above, both of which are characterized in that the overall configuration of the solenoid A is simplified and can be manufactured at low cost.

That is, in the modified example shown in FIG. 4, the solenoid A shown in FIG.
In the embodiment shown in FIG. 5, the permanent magnet 28 and the pole core 27 are both not used. That is, in FIG. 5, a closing portion 23a is provided at the upper end of the plunger guide 23, and one end of the main spring 31 is supported on the inner surface of the closing portion 23a. The upward movement of the sub-plunger 26 is regulated by the plunger movement regulating piece 23b.

FIGS. 7 and 8 show the energization of the solenoid A according to the above-described modification.

FIG. 9 shows another modification of the solenoid valve B according to the present invention.

As shown in the figure, the present modification is characterized in that the permanent magnet 28 is not attached to the rear part of the pole core 27 as compared with the embodiment shown in FIG. In this example,
k ₂ <k ₁ , while the pole core 27 and the sub-plunger
The relationship between the gap c provided between the sub-plunger 26 and the gap d provided between the sub-plunger 26 and the main plunger 25 is d <c.

With such a configuration, since the magnetic field by the electromagnetic coil 11 is greatly attenuated by the gap c, the F acting on the main plunger 25 is smaller than that using the irregular magnetic field, but the current can be increased. If F itself becomes large,
The main plunger 25 is attracted to the sub-plunger 26. After the suction, the sub-plunger 26 is lifted by the water pressure received by the diaphragm 45, so that it operates in the same manner as the solenoid valve B of FIG.

(Embodiment 2) Next, an overall configuration of a flash valve system equipped with a solenoid valve B (FIG. 1) having the above configuration will be described.

In FIG. 10, reference numeral 50 denotes a water supply pipe to a toilet (not shown). The water supply pipe 50 includes a water stopcock 51, a flush valve 52, and a vacuum in order from the water supply source to the toilet. Breaker 53 is installed.

In such a configuration, in the first embodiment, the solenoid A shown in FIGS.
Are used as actuators for driving the flash valve 52 which is the solenoid valve B.

The operation of the flash valve 52 will be described. When the valve is closed, the electromagnetic coil main body 11d of the electromagnetic coil 11 is closed.
Is not energized, the plunger 25 is urged downward by the return springs 30 and 31, the pilot valve hole 48 is closed by the valve body 24 made of a diaphragm, and the main valve hole 43 is also closed.

Next, when the electromagnetic coil main body 11d is energized, a main magnetic field a and an irregular magnetic field b are generated in the electromagnetic coil 11 as described above.
The pole core 27 has a plunger 25,26 against the bias of 0,31.
And the main valve hole 43 is opened. As a result, the flush water is supplied into the toilet through the water supply pipe 20.

Then, the above-mentioned current supply is stopped, and the pole core is turned off.
Even if the excitation of the magnet 27 is stopped, the magnetic lines of force from the permanent magnets 28 for latching reach the plungers 25 and 26 via the pole core 27, so that the attracted state of the plungers 25 and 26 is maintained, and the solenoid A Keeps the valve open and continues to supply flush water to the toilet.

Next, a current in a direction opposite to the above is supplied to the electromagnetic coil.
When power is supplied to the pole 11 and the pole core 27 is excited in the opposite direction, the lower end of the pole core 27 and the upper end of the plunger 26 have the same polarity, and repel each other, separating the plunger 26 in the direction of the pilot valve hole 48. Then, the main valve hole 43 is closed. Thus, the supply of the cleaning water is stopped.

Then, even if the energization is stopped, the valve element 24 provided at the lower end of the plunger 26 is still
The solenoid valve is pressed against the pilot valve hole 48 by the urging force, and the solenoid valve remains closed.

As described above, the solenoid valve B according to the present embodiment is not limited to the flush valve described above, but may also include other automatic opening / closing valves, such as a large flow solenoid valve for a shower, a flow path switching valve, and a hot and cold water mixing device. Etc. can also be used effectively.

[0063]

As described above, according to the present invention, the plunger provided to be able to advance and retreat in the vertical hole of the electromagnetic coil is formed by the main plunger and the sub-plunger 26 to which the main plunger is attracted in an excited state. In addition, the elevation of the sub-plunger is linked to the large elevation of the diaphragm via the sub-plunger operating rod.

Therefore, it is only necessary to apply a minute current to the electromagnetic coil to raise the plunger by a minute distance, so that power saving can be achieved. Further, since the plunger can be raised significantly by utilizing the large rise of the diaphragm, the stroke of the main plunger can be further lengthened, and the flow rate can be increased by the solenoid valve.

[0065]

[Brief description of the drawings]

FIG. 1 is a sectional front view of a solenoid valve according to Embodiment 1 of the present invention.

FIG. 2 is an explanatory diagram of an operation state of the solenoid.

FIG. 3 is an explanatory diagram of an operation state of the solenoid.

FIG. 4 is an explanatory diagram of a modification of the solenoid.

FIG. 5 is an explanatory view of a modification of the solenoid.

FIG. 6 is an explanatory diagram of a voltage application state in the solenoid.

FIG. 7 is an explanatory diagram of a voltage application state of the solenoid shown in FIG. 4;

FIG. 8 is an explanatory diagram of a voltage application state of the solenoid shown in FIG. 5;

FIG. 9 is an explanatory diagram of a modification of the solenoid.

FIG. 10 is an explanatory view of a use state of the solenoid valve according to the second embodiment.

[Sign]

 A Solenoid B Solenoid valve C Diaphragm valve 10 Yoke 10a Outer periphery 10b End plate 10c End plate 10d Inner periphery for forming irregular magnetic field 10e Inner periphery for forming irregular magnetic field 11 Electromagnetic coil 12 Vertical hole 25 Main plunger 26 Secondary plunger 27 Pole core

Claims (4)

(57) [Claims] 1. A bi-rotat type diaphragm valve (C) having a pilot valve hole (48) in a diaphragm (45) for opening and closing a main valve hole (43) of a valve, and one end on an inner peripheral side of an electromagnetic coil (11). A solenoid (A) having a pole core (27) fixed to the other end and a plunger inserted through the other end so as to be able to advance and retreat, and the pilot valve hole (48) is opened and closed by the tip of the plunger to open and close the main valve hole of the valve. In the solenoid valve (B) that opens and closes (43), the plunger is composed of a main plunger (25) and a sub-plunger (26) arranged in series within an electromagnetic coil (11), and the electromagnetic coil (11) In the excited state, both plungers (25) and (26) can be adsorbed, and the base end of the sub-plunger operating rod (32), whose front end can contact the diaphragm (45), is connected to the sub-plunger (26) Large stroke movement of the diaphragm (45) due to the minute stroke movement of the main plunger (25). A solenoid valve characterized in that the sub-plunger (26) and the main plunger (25) can be moved by a large stroke in conjunction with movement. 2. A secondary return spring (30) is provided between the primary plunger (25) and the secondary plunger (26), and a primary return spring (30) is provided between the secondary plunger (26) and the pole core (27). 31), and the spring constant k _{1 of the} main return spring (31)
And the spring constant k ₂ of the sub-return spring (30), k ₂ ≦
The solenoid valve according to claim ₁ , wherein k1 is set to k1. 3. The solenoid valve according to claim 1, wherein a permanent magnet (28) is provided at a rear portion of the pole core (27). 4. An electromagnetic coil (1) instead of the pole core (27).
A cylindrical plunger guide (23) is inserted concentrically into the vertical hole (12) of (1), and one end of the plunger guide (23) is closed, and the plunger (25) can be moved back and forth within the other end. The solenoid valve according to claim 1, wherein the solenoid valve is inserted through the solenoid valve.