WO1988010388A1

WO1988010388A1 - Solenoid valve

Info

Publication number: WO1988010388A1
Application number: PCT/JP1988/000579
Authority: WO
Inventors: Shozo Miyazawa; Eiji Kobayashi
Original assignee: Kabushiki Kaisha Kambayashi Seisakujo
Priority date: 1987-06-23
Filing date: 1988-06-14
Publication date: 1988-12-29
Also published as: KR890701942A; JPS643178U

Abstract

This invention relates to a solenoid valve. In a conventional solenoid valve, the supply of power to an electromagnetic coil must be continued in order to keep a valve seat in an open or closed state and this results in the problem that power consumption is large. To solve this problem, the solenoid valve in accordance with the present invention comprises an electromagnetic coil, an armature composed of a permanent magnet capable of moving inside a center hole of the electromagnetic coil in its axial direction and equipped with a valve body for substantially opening and closing the valve seat at the end portion inside a flow path on the valve seat side, a fixed magnetic pole made of a magnetic material so that the armature can be attracted by its own magnetic force even when the supply of power to the electromagnetic coil is stopped and disposed at the position where it attracts the armature when the power is supplied to the electromagnetic coil, and biasing means for biasing always the armature to the valve seat. The valve of the invention can be used as means for shutting off or allowing the flow of a fluid or for controlling a flow rate.

Description

Specification

Name of the invention

solenoid valve

Technical field

The present invention relates to a solenoid valve, and more particularly to a self-holding solenoid valve using a permanent magnet.

Background technology

Conventionally, an electromagnetic valve has an armature movably provided in the axial direction of the electromagnetic coil in accordance with the passage of electricity to the electromagnetic coil, and a valve body attached to one end of the armature. It is known that the valve seat is opened and closed directly or via a diaphragm or the like as the valve element moves in the axial direction of the electromagnetic coil.

However, the above-mentioned conventional solenoid valve has the following problems.

When the power to the electromagnetic coil is stopped, the armature separates from the electromagnetic coil and returns to the previous position. Therefore, when energization of the electromagnetic coil is stopped, the valve body once opens or closes the closed or open valve seat again. If it is desired to maintain the open or closed state once the electromagnetic coil is energized, the energization of the electromagnetic coil must be continued, which increases the power consumption. There is.

Disclosure of the invention

Therefore, an object of the present invention is to provide a solenoid valve which can maintain the power-on state by itself even if power supply to the electromagnetic coil is stopped once and consumes less power. Prepare.

That is, while being formed by an electromagnetic coil and a permanent magnet movable in the axial direction of the electromagnetic coil in the center hole of the electromagnetic coil, An armature provided with a valve element for substantially opening and closing the valve seat is provided at an end of the flow passage at the valve seat side, and a position where the electromagnetic coil is energized and sucks the armature. A fixed magnetic pole formed of a magnetic material so that the armature can be attracted by its own magnetic force even when the energization of the electromagnetic coil is stopped; and urging means for constantly urging the armature toward the valve seat. It is characterized by having.

With the above configuration, the solenoid valve according to the present invention can maintain its state even when power supply to the solenoid coil is stopped by using a permanent magnet, so that the solenoid valve when opening and closing the solenoid valve is operated. The power supply to the device is completed in a very short time. Therefore, an economical solenoid valve with low power consumption can be provided.

Brief explanation of drawings

FIG. 1 is a front sectional view showing a first embodiment of a solenoid valve according to the present invention,

Fig. 2 is an explanatory diagram showing the relationship between the polarity of the electromagnetic coil and the polarity of the permanent magnet.

FIG. 3 is a sectional view showing an exploded state of the solenoid valve of FIG. 1, and FIG. 4 is a front sectional view showing a second embodiment.

Example

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(First embodiment)

The first embodiment will be described with reference to FIG.

First, the configuration will be described.

In the figure, reference numeral 10 denotes an electromagnetic coil, which is formed by winding a wire HI on a coil bobbin 12. Midway of coiled bobbin 1 2 Φ core hole 1 4 The part is gas-liquid-tightly partitioned by a partition 16.

Reference numeral 18 denotes a casing, which is formed of a non-magnetic material and contains the above-mentioned electromagnetic coil 10 or the like inside.

Reference numeral 20 denotes a fixed magnetic pole, which is fixed by caulking to a through hole 22 formed in the top of the casing 18 and above the partition 16 of the center hole 14 of the electromagnetic coil 10. Are arranged.

Reference numeral 24 denotes an armature, which is formed so that the permanent magnet 26 and the valve element 28 are integrated with a cap 30 of a non-magnetic material. The armature '24 has its upper part movable below the partition wall 16 of the center hole 14 of the electromagnetic coil 10 in the axial direction. The valve element 28 is capable of opening and closing a pie port valve seat of a diaphragm plate to be described later on its bottom surface.

Reference numeral 32 denotes a diaphragm, and the outer periphery 緣 is fixed to the inner wall surface of the casing 18. A diaphragm plate 34 having a pilot valve seat 35 is fitted to the center of the diaphragm 32. A small hole 36 is formed in the diaphragm 32 and the diaphragm plate 34, and a back pressure chamber 38 is formed in the upper part of the valve main body from the diaphragm 32. Accordingly, the armature 24 moves in the back pressure chamber 38 in the axial direction of the electromagnetic coil 10.

Reference numeral 40 denotes a spring serving as an urging means, which is externally fitted to the valve body 28, and has an upper outer periphery which abuts against the coil bobbin 12 to constantly urge the armature 24 downward. .

A valve unit 42 is formed by the casing 18, the electromagnetic coil 10, the upper magnetic pole 20, the spring 40, the diaphragm 32, and the diaphragm plate 34.

Reference numeral 4 denotes a valve seat, which is formed integrally with the outer cylindrical portion 48 by connecting pieces 46 extending radially from the outer wall. Is composed. The upper end of the outer tubular portion 48 is fitted and fixed in the lower end of the casing 18 so that the valve unit 42 and the valve seat unit 50 are connected. At this time, the outer peripheral edge of the diaphragm 32 is clamped together with the lower end of the coil pobin 14.

In addition, the lower end of the casing 18 is bent inward to prevent the outer cylinder 48 from coming off the casing 18.

A flat flow sheet 52 made of rubber is externally fitted around the outer periphery of the valve seat 44. It is accessible. A filter 56 is externally fitted to the lower portion of the flow sheet 52 to prevent intrusion of dust and the like from the gap between the outer wall of the valve seat 44 and the inner wall of the outer tube portion 48.

Numeral 58 denotes a flow unit, which is provided with an inflow channel 60 and an outflow channel 62. The flow unit 58 has an open upper surface, and a valve unit 42 and a valve seat unit 50 are fitted into a concave portion 64 inside. In order to secure gas-liquid tightness at this time, a ring 66,... * Is interposed between the sliding surfaces of the valve seat unit 50 and the flow passage unit 58.

Further, the valve unit 42 is pressed and fixed to the flow passage unit 58 by a bolt Ί0 ••• via a washer 68 ** ', and the valve unit 42 and the valve seat unit 5 are fixed. 0 and the channel unit 58 are formed in the body. FIG. 3 is a sectional view showing the disassembled state of the valve unit 42, the valve seat unit 50 and the flow unit 58.

Next, the operation will be described with reference to FIG. 1 and FIG.

In the state shown in FIG. 1, the electromagnetic coil 10 is not energized, the armature 24 is pushed downward by the urging force of the spring 40, and the valve element 28 is moved by the diaphragm of the diaphragm 34. When the valve seat 35 is closed In both cases, the diaphragm 32 is seated on the valve seat 44 and the valve seat 44 is closed. The fluid enters the inflow channel 60 in the direction of arrow A, and the dust is removed by the filter 56. Further, it passes through the gap between the flow sheet 52 and the inner wall of the outer cylinder portion 48, enters the back pressure chamber 38 through the small hole 36, and applies back pressure to the diaphragm 32 and the diaphragm plate 34. I have. Here, the polarity of the permanent magnet 26 of the armature 24 is described as an N pole at the upper end and an S pole at the lower end as shown in FIG.

Next, when a current is applied to the electromagnetic coil 10 so that the upper end of the electromagnetic coil 10 becomes the S-pole and the lower end becomes the N-pole in order to flow the fluid to the outflow channel 62 (Fig. 2 (a) However, the fixed magnetic pole 20 formed of a magnetic material is magnetized, and the upper end becomes the N pole and the lower end becomes the S pole. Then, the fixed magnetic pole 20 and the permanent magnet 26 attract each other, the armature 24 stakes the biasing force of the leaf spring 40 and approaches the fixed magnetic pole 20, and the permanent magnet 26 attracts to the fixed magnetic pole 20. I do. Here, the permanent magnet 26 retains its state of being attracted to the fixed magnetic pole 20 by its own magnetic force even when the current supply to the electromagnetic coil 10 is stopped.

At this time, the valve element 28 of the armature 24 opens the pilot valve seat 35 and releases the pressing of the diaphragm 32 and the diaphragm plate 34, so that the diaphragm is formed in the back pressure chamber 38. The fluid that has applied back pressure to the diaphragm 32 and the diaphragm plate 34 flows out from the opened pipe port valve seat 35 to the outflow passage 62. Accordingly, the diaphragm 32 also opens the valve seat 4 4. Then, the fluid that has entered from the inflow channel 60 flows to the open valve seat 44 with a small flow resistance, and flows out of the outflow channel 62 in the direction of arrow B. At this time, the permanent magnet 26 is attracted to the fixed magnetic pole 20 by its own magnetic force, and the fluid can flow even when the electromagnetic coil 10 is not energized. Here, in order to stop the outflow of the fluid to the outflow passage 62, a current in the opposite direction to that when the valve seat 44 is opened is supplied to the electromagnetic coil 10. Then, the upper end of the electromagnetic coil 10 becomes the N pole and the lower end becomes the S pole. Then, the fixed magnetic pole 20 has an S pole at the upper end and an N pole at the lower end, and the fixed magnetic pole 20 and the permanent magnet 26 repel each other. Then, the armature 24 closes the pilot valve seat 35 by the urging force of the leaf spring 40 and presses the diaphragm 32 and the diaphragm plate 34, so that the diaphragm 32 closes the valve seat 4. Then, the fluid does not escape from the valve seat 4 4 to the outflow channel 6 2, enters the back pressure chamber 38 from the small hole 36, and applies back pressure to the diaphragm 32 and the diaphragm plate 3 4. Close. Here, even if the energization to the electromagnetic coil 10 is stopped, the armature 24 can maintain the same state by the urging force of the leaf spring 40.

In this embodiment, a filter 56 and a flow sheet 52 are provided between the inflow path 60 and the valve seat 44. This filter 56 allows dust and the like to flow to the outflow path 62. When the inflow pressure of the fluid becomes excessively high, the outer edge, which is the free end of the flow sheet 52, bends and approaches the step portion 54, so that the pressure of the fluid in the flow path 62 ( Flow rate) can be kept below a substantially constant value.

In addition, the unit 72, which combines the valve unit 42 and the valve seat unit 50, and the channel unit 58 can be combined, so if the unit 72 has high accuracy, the flow Since the accuracy of the road unit 58 may be low, the manufacturing cost can be suppressed, and a compatible solenoid valve can be realized. (Second embodiment)

A second embodiment will be described with reference to FIG.

This embodiment places the valve seat 100 directly below the armature 102. It is a direct-acting solenoid valve that opens and closes with the provided valve element 104. Further, in this embodiment, the valve element 104 is constantly biased in the direction of the valve seat 100 by using the coil spring 106 as the biasing means.

Fluid flows in the direction of arrow C in the inflow passage 108, but in the state shown in FIG. 4, the flow of the fluid is stopped because the valve body 104 closes the valve seat 100.

Here, as in the first embodiment, the electromagnetic coil 110 is energized to magnetize the fixed magnetic pole 1 12, and the permanent magnet 111 of the armature 102 is attached to the coil spring 106. When adsorbed against the force, the valve seat 100 is opened, and the fluid flows through the outflow passage 116 in the direction of arrow D. Conversely, in order to stop the outflow of the fluid, a current in the opposite direction is applied to the electromagnetic coil 110 to repel the fixed magnetic pole 1 12 and the permanent magnet 1 14.

Then, the armature 102 is pushed toward the valve seat 100 by the urging force of the coil spring 106, and the valve element 104 closes the valve seat 100 to stop the flow of fluid. .

Also in this embodiment, a valve unit 120 having a casing 118, an electromagnetic coil 110, an armature 102, a coil spring 106, a valve seat 100 and its valve A single solenoid valve is formed by fitting a unit, which is a combination of a valve seat unit 124 consisting of a seat 100 and an outer cylinder part 122 integrally formed, to a flow unit 126. Has been established.

However, the solenoid valve according to the present invention does not necessarily need to be able to be divided into a valve unit, a valve seat unit and a flow channel unit as in the above-described embodiment.

Further, the valve body may close the valve seat when the armature is attracted to the fixed magnetic pole.

Further, in the first and second embodiments, the permanent magnet is Although the armature is provided in the coil, the armature may be formed of a magnetic body and a valve body, and the permanent magnet may be provided in the center hole of the electromagnetic coil. In this case, if the armature is energized to the electromagnetic coil and is attracted against the urging force of the urging means, the magnetic material is attracted to the permanent magnet even if the energization of the electromagnetic coil is stopped. The adsorbed state is maintained. When releasing the armature, a current in the opposite direction is applied to the electromagnetic coil to generate a magnetic field in the electromagnetic coil that attenuates the magnetic force of the permanent magnet, and the armature is permanently turned on by the urging force of the urging means. You may make it release from a magnet.

As described above, various preferred embodiments of the present invention have been arrested. However, the present invention is not limited to the above-described embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

Claims

The scope of the claims

An electromagnetic coil,

A permanent magnet movably arranged in the axial direction of the electromagnetic coil in the center hole of the electromagnetic coil, and a valve body integrally assembled with the permanent magnet for opening and closing a valve seat provided in the flow passage An armature that has

Biasing means for constantly biasing the armature toward the valve seat;

When energized to the electromagnetic coil so as to suck the armature, it is arranged at a position where the armature is adsorbed, and once the armature is adsorbed, even if the energization to the electromagnetic coil is stopped, the attachment is stopped. A solenoid valve comprising: a fixed magnetic pole formed of a magnetic material so as to be attracted by the magnetic force of the permanent magnet of the armature against the urging force of the urging means.

An electromagnetic coil,

A magnetic body disposed movably in the axial direction of the electromagnetic coil in the center hole of the electromagnetic coil; and a valve seat integrated with the magnetic body and opened and closed in a flow passage. Armature having a valve body for

Biasing means for constantly biasing the armature in the valve seat direction;

When energized to the electromagnetic coil so as to suck the armature, the armature is arranged at a position where the armature is sucked, and once the armature is adsorbed, its own magnetic force is applied even if the energization to the electromagnetic coil is stopped. Thus, the armature can be attracted against the urging force of the urging means. When the electromagnetic coil is energized to release the armature, the magnetic force is attenuated by the magnetic force of the electromagnetic coil. one An electromagnetic valve, comprising: a permanent magnet for releasing attraction of a mature person.

, Electromagnetic coil,

A back pressure chamber is separated inside the valve body, and a small hole communicating with the inlet side of the valve seat provided in the flow passage is formed, and the back pressure chamber and the outlet side of the valve seat are provided. A diaphragm plate having a pie-mouth valve seat is attached, and a diaphragm for opening and closing the valve seat;

A permanent magnet movably arranged in the axial direction of the electromagnetic coil in the center hole of the kasumi coil and a valve body integrally assembled with the permanent magnet for opening and closing the pi-port valve seat; An amateur with a

Always keep the armature in the pie mouth valve seat! Biasing means for biasing to ¾:

When the electromagnetic coil is energized so as to suck the armature, it is arranged at a position where the armature is adsorbed. Once the armature is adsorbed, even if the energization to the electromagnetic coil is stopped. A solenoid valve, comprising: a fixed magnetic pole formed of a magnetic material so as to be attracted by the magnetic force of the permanent magnet of the armature against the urging force of the urging means.

An electromagnetic coil,

A back pressure chamber is separated inside the valve main body, and a small hole communicating with the inlet side of the valve seat provided in the flow passage is formed, and the back pressure chamber and the inlet side of the valve seat are provided. A diaphragm plate having a pi-pitting valve seat for communicating with the diaphragm, and a diaphragm for opening and closing the valve seat;

Move in the axial direction of the electromagnetic coil in the center hole of the electromagnetic coil An armature having a magnetic body disposed so as to be capable of being opened and closed, and a valve body for integrally opening and closing the pilot valve seat;

Biasing means for constantly biasing the armature toward the pilot valve seat;

When energized to the electromagnetic coil so as to suck the armature, it is arranged at a position where the armature is adsorbed. Once the armature is adsorbed, even if the energization to the electromagnetic coil is stopped, the armature itself is stopped. The armature can be attracted to the urging force of the urging means by the magnetic force of the above, and when the electromagnetic coil is energized to release the armature, the magnetic force is attenuated by the magnetic force of the electromagnetic coil. A solenoid valve comprising: a permanent magnet for releasing the attraction of the armature.

The valve unit having the electromagnetic coil, the armature, the fixed magnetic pole, and the urging means, and the valve unit having the valve seat are integrally assembled. The solenoid valve according to any one of paragraphs 2, 2 and 3.

The unit according to claim 1, wherein a unit formed by integrally assembling the valve unit and the valve seat unit is integrally assembled with a flow unit having an inflow path and an outflow path. The solenoid valve according to any one of paragraphs 2, 3 and 4 or 5.

A flexible flow sheet is provided on the inflow side of the valve seat, wherein the flow sheet has flexibility. Claims 1, 2, 3, 4, 5 or 5 characterized in that: The solenoid valve according to item 6.