JPH11315950A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform switching among various fluids with less power consumption. SOLUTION: This solenoid valve opens/closes the passage of fluids by using the attractive force of an electromagnet to move a movable valve. In this case, the solenoid valve is provided with a cylindrical electromagnet 1, a movable valve 2 arranged in the electromagnet 1 and casings 5 and 6 fixed to both open end surfaces of the electromagnet 1 and having fluid passages 3 and 4. The movable valve 2 is provided with one movable piece 7, a holder 8 fixed to both end parts of the movable piece 7, an opening/closing valve element 9 provided in the holder 8, and a fluid passage 10 formed in the outer peripheral of the holder 8 so as co be communicated with the fluid passages 3 and 4 of the casings 5 and 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electromagnetic valve. More specifically, the present invention relates to an electromagnetic valve capable of switching between supply and exhaust of a fluid to an air mat and supply of a fluid to an air mat divided into a plurality of zones.

[0002]

2. Description of the Related Art As a conventional electromagnetic valve, for example, FIG.
As shown in FIG. 2, an electromagnet 100, a bottomed inner cylinder 101 fitted inside the electromagnet 100, and the inner cylinder 101
The movable valve 10 supported by the spring 102 inside the
3 and a casing 106 attached to the end face side of the electromagnet 100 and having an air introduction passage 104 and an air discharge passage 105 formed therein. When the electromagnet 100 is not energized, the valve body 107 is moved by the urging force of the spring 102 to the valve seat 108.
To keep the air from flowing,
When the electromagnet 100 is energized, the electromagnet 100
The movable valve 103 is opposed to the spring 102 by the suction force of the above, the valve element 107 is separated from the valve seat 108, and air is supplied.

[0003]

However, in order to supply and exhaust air, such an electromagnetic valve requires an adapter for switching and exhausting the air flow path. Further, in order to switch and supply the fluid to the air mat divided into a plurality of zones, two sets of such electromagnetic valves and an adapter for assembling them are required. As a result, there is a problem that the structure becomes complicated, the manufacturing cost increases, and the usability is poor.

In order to solve such a problem, the present applicant has proposed a cylindrical electromagnet, first and second movable valves provided in the electromagnet and having a fluid passage formed therein,
There has been proposed an electromagnetic valve comprising a casing mounted on an open end of the electromagnet and having a fluid passage formed therein, the movable valve being moved by the attraction force of the electromagnet to open and close the fluid passage of the casing (Japanese Patent Application No. 2002-214,878). Hei 10-30199). In the electromagnetic valve in which the first and second movable valves are disposed in the electromagnet, a space is formed between the first movable valve and the second movable valve, so that the electromagnetic valve becomes large. As the space grows, so does the space. For this reason, the magnetic resistance in the space increases, and a large current needs to flow through the electromagnet, so that power consumption increases.

The present invention has been made in view of the circumstances described above,
An object of the present invention is to provide an electromagnetic valve capable of switching various fluids.

[0006]

The electromagnetic valve of the present invention comprises:
An electromagnetic valve that opens and closes a fluid passage by moving a movable valve by an attractive force of an electromagnet, comprising: a cylindrical electromagnet; a movable valve disposed in the electromagnet; and an open end face of the electromagnet. Wherein the movable valve comprises one movable element, a holder fitted to both ends of the movable element, an opening / closing valve element provided in the holder, A fluid passage formed on the outer periphery of the holder and communicating with the fluid passage of the casing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electromagnetic valve according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a sectional view of an essential part showing an embodiment of the electromagnetic valve of the present invention, FIG. 2 is a side view of the electromagnetic valve in FIG. 1, and FIGS. 3 and 4 show the operation of the electromagnetic valve in FIG. FIG. 5 is a sectional view showing a main part of another embodiment of a normally open type electromagnetic valve, FIG. 6 is a sectional view showing another embodiment of a mover, and FIGS. FIG. 9 is an explanatory view showing the operation of the valve, FIG. 9 is a cross-sectional view of a main part showing still another embodiment of the mover, and FIG. 10 is a cross-sectional view of a main part showing still another embodiment of the electromagnetic valve of the present invention 11 is an explanatory diagram showing the operation of the electromagnetic valve in FIG.

As shown in FIGS. 1 and 2, an electromagnetic valve according to an embodiment of the present invention includes a cylindrical electromagnet 1, a movable valve 2 disposed in the electromagnet 1, The casings 5 and 6 are provided on both ends of the open side and have fluid passages 3 and 4 formed therein. The movable valve 2 is moved by the attraction force of the electromagnet 1 to open and close the fluid passage. Have been.

The movable valve 2 has one movable element 7 and a cylindrical holder 8 having a bottom and fitted to both ends of the movable element 7.
A disk-shaped opening / closing valve body 9 provided on the holder 8,
The casing 5, which is formed on the outer periphery of the holder 8,
6 and a fluid passage 10 communicating with the fluid passages 3 and 4.

The electromagnet 1 includes a cylindrical outer yoke 11, disk-shaped yokes 12 and 13, and a synthetic resin winding bobbin 14 disposed in a space surrounded by these yokes. Electromagnetic coil 1 with copper wire wound
5 can be used, but the present invention is not limited to this. For example, instead of the disk-shaped end yokes, opposite end yokes having a substantially U-shaped cross section are opposed to each other. An electromagnetic coil may be provided in a donut-shaped space formed by the above method.
The outer peripheral yoke 11 is formed with a notch (not shown) for drawing out a copper wire.

In this embodiment, the air mat is divided into a plurality of zones, and air is supplied to each of the zones A and B.
When the air mat is inflated and contracted, the fluid passage 3 of the casing 5 includes a fluid supply passage 3a communicating with the air pump and a fluid supply / discharge passage 3b communicating with the zone B of the air mat. The fluid passage 4 includes a fluid exhaust passage 4a communicating with pressure detecting means such as a sensor for detecting the air pressure of the air mat, and a fluid supply / discharge passage 4b communicating with the A zone of the air mat. The exhaust passage 4a is always in communication with the exhaust passage 3a via the fluid passage 10. As the pressure detecting means, by measuring the air pressure of the air mat,
The present invention is not particularly limited as long as the air pressure of the air mat can be constantly controlled. The electromagnetic coil 15 of the electromagnet 1 is provided with a coil 15a so that the power supply current can be alternately switched by a bridge circuit.
Is connected.

The fluid passage 10 is formed by a recess such as a tooth profile or a spline on the outer peripheral portion of the holder 8. The material of the holder 8 has abrasion resistance and high rigidity because it slides repeatedly in the electromagnet 1.
For example, a polyacetal (Duracon) -based or polyamide (nylon) -based resin can be used. The on-off valve body 9 is held by press-fitting or screwing a truncated cone-shaped base 9 a into a bottom wall hole of the holder 8. In the present embodiment, a disc-shaped valve element is used. However, the present invention is not particularly limited to this.
An umbrella-shaped shape that can be bent and stretched of synthetic rubber such as (ethylene-propylene diene monomer).

The mover 7 is composed of a pair of magnets 16 arranged at both ends with the same poles facing each other, and a yoke 17 such as iron integrally joined between the magnets 16. Thus, the yoke 1 is provided between the pair of right and left magnets 16.
Since the 7 is integrated, there is no space for increasing the magnetic resistance in the magnetic path formed between the pair of magnets 16, and a large thrust can be obtained with a small current. The magnet 16 is held inside the holder 8 by press fitting or bonding. As the magnet 16, an anisotropic permanent magnet such as a cylindrical anisotropic ferrite magnet or a rare earth magnet is used. The magnet 16 is arranged such that the opposite poles of the permanent magnet are the same, for example, the south pole. Therefore, in this embodiment, the magnet 16 and the yokes 12 and 13 attract each other, the on-off valve body 9 is separated from the valve seat 18 of the casings 5 and 6, and the normal fluid passages 3 and 4 are opened. A normally open electromagnetic valve is formed.

In the present embodiment, a magnetic pole piece (pole piece) 19 made of a soft magnetic material such as iron or silicon steel plate is arranged between the outer end surface of the magnet 16 and the holder 8, and is formed by a magnet. Although the magnetic field is strengthened, the pole piece 19 can be omitted in the present invention.

An annular groove 21 for fitting a sealing material 20 such as an O-ring is formed on the outer periphery of the valve seat 18 of the casings 5 and 6. A through hole 22 is formed at each corner of the casings 5 and 6.
The casings 5 and 6 and the electromagnet 1 are assembled by a screw shaft 23 and a nut 24 that penetrate through the casing 2.

Although the internal fluid during operation is prevented from leaking from the mating surfaces of the casings 5 and 6 and the electromagnet 1 by the sealing member 20, the inner circumference of the electromagnet 1 is made of non-magnetic copper or the like. By providing the inner cylinder 25, leakage of the internal fluid from the electromagnet 1 can be prevented, and heat radiation from the electromagnet 1 can be cooled. 25a
Is a fluid passage.

In the normally open type electromagnetic valve according to the present embodiment, the magnet 16 and the yoke 12,
In order to hold the movable valve 7 in a well-balanced state, the coil springs 2 are disposed between the casings 5 and 6 and the holder 8 as shown in FIG.
6 are preferably arranged.

Next, the operation of the solenoid valve according to the present embodiment will be described with reference to FIGS. First, as shown in FIG. 1 and FIG. 3, a coil 15a connected to the electromagnetic coil 15 of the electromagnet 1 is energized with +-polarity. As a result, when the right end yoke 12 is excited to the N pole and the left end yoke 13 is excited to the S pole, the right magnet 16 is attracted and repelled by the N polarity of the right end yoke 12 to cause an arrow K. A thrust is generated in the direction of arrow K, and the left magnet 16 is attracted and repelled by a combination opposite to that of the right magnet 16 due to the S polarity of the left end yoke 13, so that the thrust in the direction of arrow K is generated. Occur. As a result, the movable valve 2 slides in the direction of arrow K,
The right valve element 9 closes the valve seat 18. After the fluid supplied from the pump passes through the fluid passage 10 from the supply passage 3a, it branches and flows from the supply / discharge passage 4b to the zone A of the air mat, and also flows to the exhaust passage 4a.

Next, as shown in FIG. 4, the power supply current is switched so that the coil 15a is energized so as to have a polarity opposite to the above-mentioned polarity. As a result, the polarities of the right end face yoke 12 and the left end face yoke 13 are reversed, so that the opening / closing operation of the movable valve 2 shown in FIG. 3 is reversed, the right valve element 9 is opened, and the left valve element 9 is opened. Closes. As a result, the fluid supplied from the pump flows from the supply passage 3a to the zone B of the air mat via the supply / discharge passage 3b, and after passing from the supply passage 3a to the fluid passage 10 of the movable valve 2,
It flows to the exhaust passage 4a.

As described above, by alternately energizing the left and right electromagnets, the adjacent air chambers of the air mat alternately expand and contract.

Such an air mat can be used to prevent or treat so-called bedridden patients with congestion, sweating and bed sores due to local increased pressure at the site of contact between the bed and the body. Also, it can be used as an air mat for relieving stress by comfortable sleep.

Next, another embodiment of the present invention will be described. In the electromagnetic valve according to the embodiment, the opening / closing valve body of the movable valve is a normally open type valve body, whereas the present embodiment is characterized in that it is a normally closed type valve body. And different.

That is, as shown in FIG.
The opening / closing valve element in the above is a bellows 32 which is a normally closed type valve element. This bellows 32
The base portion 32a is fixed to the outer peripheral portion of the holder 33, and the flat end portion 32b is in contact with the valve seats 18 of the casings 5, 6. In the bellows 32, a coil spring 34 of an elastic member for urging toward the valve seat 18 side and a flat end portion 32 are provided.
The presser washer 35 for biasing b in parallel is housed. A guide pin 36, which penetrates the hole of the flat end portion 32b, is fixed to the holder 33 by press fitting or screwing in order to guide the bellows 32 to expand and contract. Although there is a slight gap between the guide pin 36 and the hole of the flat end portion 32b, the base 32a of the bellows 32 has a small gap.
Is fixed to the outer peripheral portion of the holder 33, so that air leakage from the bellows 32 in contact with the valve seat 18 is prevented. Therefore, in this embodiment, the bellows 3
2 is in contact with the valve seats 18 of the casings 5 and 6 to form a normally closed electromagnetic valve that normally closes the fluid passages 3 and 4.

Next, the operation of the electromagnetic valve of the present embodiment will be described. In the present embodiment, the supply passage 3a of the casing 5 is connected to the air mat and the supply / discharge passage 3b
To the air pump. Then, the exhaust passage 4a of the casing 6 is connected to the pressure detecting means, and the supply / discharge passage 4b is connected to the outside air. First, as shown in FIG. 7, a coil 15a connected to the electromagnetic coil 15 of the electromagnet 1 is energized with a positive or negative polarity. As a result, when the left end yoke 13 is excited to the N pole and the right end yoke 12 is excited to the S pole, the right magnet 16 is attracted and repelled by the S polarity of the right end yoke 12 to cause an arrow K1. A thrust in the direction of arrow K1 is generated, and the left magnet 16 is attracted and repelled by a combination opposite to that of the right magnet 16 due to the N polarity of the left end yoke 13, so that the thrust in the direction of arrow K1 is generated. Occur. As a result, the movable valve 2 slides in the direction of arrow K1, and the right bellows 32 is separated from the valve seat 18. The fluid supplied from the pump flows from the supply / discharge passage 3b through the supply passage 3a to the air mat, and also from the supply / discharge passage 3b through the fluid passage 10, and then flows to the exhaust passage 4a.

Next, as shown in FIG. 8, the power supply current is switched so that the coil 15a is energized so as to have a polarity opposite to the above-mentioned polarity. Thereby, the polarities of the right end face yoke 12 and the left end face yoke 13 are reversed, so that the opening / closing operation of the movable valve 2 shown in FIG. 7 is reversed, the left bellows 32 is opened, and the right bellows 32 is closed. . As a result, the fluid from the air mat passes through the fluid passage 10 of the movable valve 2 from the supply passage 3a and then branches off to form the exhaust passage 4
a to the supply / discharge passage 4b.

In the above embodiment and this embodiment, the magnet of the mover and the holder are formed separately and fitted to each other. However, in the present invention,
However, the present invention is not limited to this, and the magnet of the mover and the holder can be integrally formed of a plastic magnet material that can be formed.

Next, an electromagnetic valve according to still another embodiment of the present invention will be described. In the present embodiment, FIG.
As shown in FIG.
The n-Al isotropic magnet is magnetized so as to be N pole-S pole-N pole in the axial direction (and in the lathia direction).
The magnetization pattern (magnetic flux density distribution) is not limited to this, but may be S pole-N pole-S pole.

Next, still another embodiment of the present invention will be described. In the present embodiment, in the electromagnetic valve according to the embodiment shown in FIG. 5, one of the left and right coil springs is omitted, and FIG.
As shown in FIG. 0, the fluid passage 4 of the casing 6 is controlled by the coil spring 50 until, for example, the left open / close valve 9 of the open / close valve 9 is energized to the electromagnet 1.
b, the fluid passage 3b of the other casing 5 is closed until the right on-off valve body 9 energizes the electromagnet 1 (hereinafter referred to as an open-and-close type electromagnetic valve). ).

In the present embodiment, the fluid supplied from the air pump connected to the supply passage 3a branches after passing through the fluid passage 10 because the right opening / closing valve body 9 closes the valve seat 18. Thus, the air flows from the supply / discharge passage 4b to the zone A of the air mat and also flows to the exhaust passage 4a.

Then, as shown in FIGS. 10 to 11, when the coil 15a connected to the electromagnetic coil 15 of the electromagnet 1 is energized with a positive or negative polarity, the right end face yoke 12
When the left end face yoke 13 is excited to the N pole, the right magnet 16 is attracted and repelled by the S polarity of the right end face yoke 12 to generate a thrust in the direction of arrow K2, and the left magnet 16 Due to the N polarity of the left end face yoke 13, the magnet 16 is attracted and repelled in a combination opposite to that of the right magnet 16, and the arrow K 2 against the coil spring 50.
Thrust is generated in the direction. As a result, the movable valve 2 has the arrow K
It slides in two directions, and the left valve element 9 closes the valve seat 18. The fluid supplied from the pump branches off from the supply passage 3a, flows from the supply / discharge passage 3b to the zone B of the air mat, passes through the fluid passage 10, and then flows to the exhaust passage 4a.

In the present invention, in the electromagnetic valve according to the embodiment shown in FIG. 6, a coil spring is arranged between one of the casings 5 and 6 and the holder 33, and the present embodiment is different from the embodiment shown in FIG. Similarly to the above, an open-and-close type electromagnetic valve can be provided.

[0033]

As described above, according to the present invention,
Since one movable valve is provided in the electromagnet, the magnetic resistance is reduced, and a large thrust can be obtained with a small current.
For this reason, it is possible to supply and exhaust the fluid and switch between the two directions with power saving of the large electromagnetic valve.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of an electromagnetic valve of the present invention.

FIG. 2 is a side view of the electromagnetic valve in FIG.

FIG. 3 is an explanatory view showing the operation of the electromagnetic valve in FIG. 1;

FIG. 4 is an explanatory diagram showing the operation of the electromagnetic valve in FIG.

FIG. 5 is a sectional view of a principal part showing another embodiment of a normally open type electromagnetic valve.

FIG. 6 is a sectional view showing another embodiment of the mover.

FIG. 7 is an explanatory diagram showing the operation of the electromagnetic valve in FIG. 6;

FIG. 8 is an explanatory diagram showing the operation of the electromagnetic valve in FIG.

FIG. 9 is a cross-sectional view of a main part showing still another embodiment of the mover.

FIG. 10 is a cross-sectional view of a principal part showing still another embodiment of the electromagnetic valve of the present invention.

11 is an explanatory diagram showing the operation of the electromagnetic valve in FIG.

FIG. 12 is a sectional view showing an example of a conventional electromagnetic valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnet 2, 31, 41 Movable valve 3, 4, 10 Fluid passage 5, 6 Casing 7, 42 Mover 8 Holder 9 On-off valve body 16 Magnet 17 Yoke 32 Bellows

Claims (11)

[Claims] An electromagnetic valve for opening and closing a fluid passage by moving a movable valve by an attractive force of an electromagnet, comprising: a cylindrical electromagnet; a movable valve disposed in the electromagnet; and opening of the electromagnet. The movable valve comprises one casing, a holder fitted to both ends of the movable element, and an opening / closing mechanism provided on the holder. An electromagnetic valve comprising a valve body and a fluid passage formed on an outer periphery of the holder and communicating with a fluid passage of the casing. 2. The electromagnetic valve according to claim 1, wherein the on-off valve body is a normally open valve body that opens a fluid passage of the casing until the electromagnet is energized. 3. The electromagnetic valve according to claim 1, wherein the on-off valve body is a normally closed valve body that closes a fluid passage of the casing until the electromagnet is energized. 4. An on-off valve body of the on-off valve body,
Until the electromagnet is energized, the coil spring opens the fluid passage of one of the casings, and the other on-off valve closes the fluid passage of the other casing until the electromagnet is energized. The electromagnetic valve according to claim 1, wherein: 5. The movable element comprises a pair of magnets arranged at both ends thereof with the same polarity facing each other, and a yoke integrally joined between the magnets. Electromagnetic valve as described. 6. The mover according to claim 1, wherein the isotropic magnet is formed by magnetizing an isotropic magnet in an axial direction to an N pole-S pole-N pole or an S pole-N pole-S pole. 6. The electromagnetic valve according to 4 or 5. 7. The electromagnetic valve according to claim 5, wherein a magnetic pole piece is disposed between an outer end surface of the magnet and the holder. 8. The normally open valve body has a disk shape or a bendable and stretchable umbrella shape.
Or the electromagnetic valve according to 7. 9. The electromagnetic valve according to claim 3, wherein the normally closed valve body is a bellows. 10. The electromagnetic valve according to claim 9, wherein the bellows includes an elastic member biased toward a valve seat formed in a fluid passage of the casing. 11. The electromagnetic valve according to claim 5, wherein the magnet of the mover and the holder are integrally formed by a moldable plastic magnet.