WO2004085896A1

WO2004085896A1 - Solenoid valve

Info

Publication number: WO2004085896A1
Application number: PCT/JP2003/003566
Authority: WO
Inventors: Nozomu Kawasaki
Original assignee: Techno Takatsuki Co., Ltd.
Priority date: 2003-03-25
Filing date: 2003-03-25
Publication date: 2004-10-07
Also published as: JP4268942B2; JPWO2004085896A1

Abstract

A solenoid valve comprising an electromagnet having a plunger, and a movable valve disposed in a valve casing and having a valve disk, wherein the attractive force of the electromagnet causes the plunger to linearly drive the valve disk of the movable valve, thereby opening/closing the flow channel in the valve casing, the solenoid valve having a lock mechanism for locking the valve disk of the movable valve at a closed position, thus making is possible to prevent occurrence of air leakage or vibration sound in an air mattress or the like due to negative or positive pressure from outside and to perform the opening/closing of the valve disk smoothly and accurately.

Description

Akira Itoda Solenoid valve Technical field

The present invention relates to an electromagnetic valve. More specifically, it relates to an electromagnetic valve that controls the supply and discharge of air to an air mat or the like. Background art

2. Description of the Related Art Conventionally, an electromagnetic valve has been used to control the supply and discharge of air to a pneumatic device such as an air mat and air bed. For example, the conventional electromagnetic valve shown in FIG. 12 includes an electromagnet 100, a bottomed inner cylinder 101 fitted inside an excitation coil of the electromagnet 100, and an inner cylinder 1. A movable valve 103 comprising a plunger supported by a compression coil spring 102 inside 01, an air introduction passage 105 and an air discharge passage 104 attached to the end face side of the electromagnet. It consists of a casing 106 formed. In the electromagnetic valve shown in FIG. 12, when the electromagnet 100 is not energized, the valve body 107 is pressed against the valve seat 108 by the urging force of the compression coil spring 102, and the air is released. The air is prevented from flowing through the introduction path 105 and the air discharge path 104. Then, when the electromagnet 100 is energized, the movable valve 103 moves downward in FIG. 12 against the urging force of the compression coil spring 102 by the attraction force of the electromagnet 100, The valve element 107 is separated from the valve seat 108 so that air is supplied from the nozzle 109.

As another example of a conventional electromagnetic valve, as shown in FIG. 13, an electromagnet 200 and a bottomed shape fitted inside an exciting coil of the electromagnet 200 are used. An inner cylinder 201, a plunger 203 disposed inside the cylinder 201, and a valve body movably supported by an end surface of the electromagnet 200 by a compression coil spring 204. 205, and a casing 208 in which an air introduction passage 206 and an air discharge passage 206 are formed, wherein the valve element 205 is connected to a tip S of the plunger 203. Some are mounted in contact with or slightly apart. In the electromagnetic valve shown in FIG. 13, when the electromagnet 200 is not energized, the valve body 205 is actuated by the urging force of the compression coil spring 204 mounted inside the casing 208. It is pressed against the seat 209 to prevent air from flowing. Then, when the electromagnet 200 is energized, the plunger 203 pushes up the valve element 206 by the attraction force of the electromagnet 200 to move the valve element 205 to the valve seat 200 of the casing 208. And the air is supplied from nozzle 210.

However, in a conventional solenoid valve as shown in FIGS. 12 to 13, air leakage occurs from the valve body due to external negative pressure or positive pressure generated by a pressure change on the output side such as an air bed, There is also a problem that the valve body generates vibration noise.

In order to prevent air leakage from the valve due to such external negative pressure or positive pressure and generation of vibration noise of the valve, it is conceivable to increase the urging force of the compression coil spring. However, as the biasing force of the compression coil spring is increased, the electromagnetic force of the electromagnet must be increased in order to supply (or discharge) air, and in response to this, the electromagnetic stone becomes larger, generating heat and There is a problem that the power consumption increases and the manufacturing cost and component cost increase.

The present invention has been made in view of the above circumstances, and provides an electromagnetic valve that consumes little power and can smoothly and accurately open and close a valve body without being affected by external negative pressure or positive pressure. . Disclosure of the invention

The electromagnetic valve according to the present invention includes: an electromagnet having a plunger; and a movable valve having a valve body disposed in a valve casing, wherein the plunger is a valve body of the movable valve by an attraction force of the electromagnet. An electromagnetic valve that opens and closes a flow path in the valve casing by linearly driving the valve, characterized in that the electromagnetic valve includes a lock mechanism that locks a valve body of the movable valve to a closed position.

The lock mechanism is

(a) at least one lock pin connected to the valve body and urged toward the inner surface of the valve casing;

(b) a lock pin receiving portion formed on an inner surface of the valve casing and capable of engaging with a tip end of the lock pin when the valve body is in a closed position;

(c) a lock pin operating section provided at the end of the plunger of the electromagnet and a force,

It is preferable that when the plunger of the electromagnet moves in the opening direction of the valve element, the hook pin operating portion is configured to release the mouth pin from the mouth pin receiving portion.

The lock pin is connected to the connecting rod extending from the valve body toward the plunger at an end with respect to the axial direction of the connecting rod. A boss portion having an opening edge of the boss portion is in contact with an outer surface of the lock pin,

In the closed position of the valve body, a bottom surface of the boss is separated from a tip end of a connecting rod of the valve body,

When the plunger of the electromagnet moves in the opening direction of the valve body, the opening edge of the pos portion pushes the lip pin inward to disengage the lip pin from the lock pin receiving portion, And the bottom surface of the boss portion is It is preferable that the valve is opened by pressing the connecting rod. It is preferable that a flow path is formed around the lock pin of the valve body. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an explanatory cross-sectional view of a solenoid valve according to an embodiment of the present invention in a state where a valve body is closed.

FIG. 2 is an exploded perspective view of a movable portion of the electromagnetic valve of FIG.

FIG. 3 is an explanatory view of the operation of the electromagnetic valve of FIG. 1, and is an explanatory side view showing a state in which the valve body is unlocked.

FIG. 4 is an operation explanatory view of the electromagnetic valve of FIG. 1, and is a cross-sectional explanatory view showing a state where a valve body is opened.

FIG. 5 is an enlarged sectional view of the lock mechanism of FIG.

FIG. 6 is an enlarged sectional view of a main part showing another embodiment of the electromagnetic valve of the present invention.

FIG. 7 is an explanatory sectional view showing still another embodiment of the electromagnetic valve of the present invention.

FIG. 8 is an explanatory cross-sectional view showing still another embodiment of the electromagnetic valve of the present invention.

FIG. 9 is an explanatory cross-sectional view showing a still further embodiment of the electromagnetic valve of the present invention in a hooked state.

FIG. 10 is a view of the lip pin and the lip pin receiving portion of FIG. 9 viewed from below.

FIG. 11 is a view of the unlocked state of the lock pin and the lip pin receiving portion of FIG. 9 as viewed from below.

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

FIG. 13 is a sectional view showing another example of a conventional electromagnetic valve. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an electromagnetic valve of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, an electromagnetic valve according to the present embodiment includes an electromagnet 1 including a cylindrical excitation coil 2, a plunger 3 disposed in the electromagnet 1, and flow paths 4 and 5. A valve casing 6 having a valve body 8, a movable valve 7 having a valve body 8, and a lock mechanism 22 for locking the valve body 8 in a closed position. Have been.

The movable valve 7 includes a valve element 8 and a compression coil spring 10 that urges the valve element 8 in a direction to close the valve element 8 (downward in FIG. 1). For example, an annular groove 17 for fitting the sealing material 11 is formed. The movable valve 7 is configured to open and close the flow paths 4 and 5 by moving the valve body 8 by the attraction force of the electromagnet 1.

As shown in FIGS. 1 and 2, the electromagnet 1 of the present embodiment has a rectangular outer yoke 13, rectangular plate yokes 14, 15, and a space surrounded by these yokes. And an exciting coil 2 in which a copper wire is wound around a synthetic resin winding pobin 16 disposed at the center of the exciting coil 2. A plunger made of a magnetic material such as steel is provided at the center of the exciting coil 2. 3 is arranged reciprocally. Further, at the center of the exciting coil 2, a stop 19 for stopping the plunger 3 at a predetermined height is provided. Note that the present invention is not limited to the electromagnet having such a configuration, and various shapes or configurations of electromagnets can be adopted as long as the plunger can reciprocate by electromagnetic force. As shown in FIGS. 1, 2 and 5, the lock mechanism 22 of the present embodiment includes a pair of lock pins 9 connected to the valve body 8 and urged toward the inner surface of the valve casing 6. A lock pin receiving portion 24 formed on the inner surface of the valve casing 6 and capable of engaging with the distal end portion 23 of the lock pin 9 when the valve body 8 is in the closed position, and provided at the distal end of the plunger 3 of the electromagnet 1. Lock pin operation part 0

It is composed of

The lock pin 9 is made of, for example, a synthetic resin, stainless steel, phosphor bronze, or the like, and has a shape that is flexible. The lock pin 9 is provided at the tip 25 a of a connecting rod 25 extending from the valve body 8 toward the plunger 3. It is connected to the connecting rod 25 at an angle to the axis. The distal end 23 of the lock pin 9 has a substantially prismatic or substantially cylindrical shape, and slightly protrudes outward.The elasticity of the lock pin 9 causes the distal end 23 to be closed when the valve 8 is in the closed position. It is engaged with the lock pin receiving portion 24. The number, shape, or material of the lock pins 9 can be appropriately selected according to various conditions such as the supply pressure of air and the specifications of the electromagnet, and is not particularly limited in the present invention.

The valve body 8, the connecting rod 25 and the lock pin 9 can be made by integral molding using a synthetic resin or the like.However, after the lock pin 9 is made of metal or the like, it is connected to the connecting rod 25 that has been made separately. May be.

As shown in FIG. 5, the lock pin receiving portion 24 is deeply hollowed out so as to have a substantially rectangular cross section. When the distal end portion 23 of the lock pin 9 is engaged, the lock pin receiving portion 24 is locked. Since the horizontal contact surface 24 a of 24 contacts the distal end portion 23, the movement of the lock pin 9 and the valve element 8 in the opening direction is reliably stopped.

The distal end 23 of the lock pin 9 is formed in a substantially prismatic or substantially cylindrical shape having a diameter of about 0.5 to 2 mm, and receives the distal end 23 and forms a connection with the distal end 23. The dimensions of the lock pin receiver 24 are selected so as to achieve engagement.

The lock pin receiving portion 24 shown in FIG. 5 is deeply hollowed out so as to have a substantially rectangular cross section, and a horizontal contact surface 24 a engages the distal end portion 23 of the lock pin 9. (Abutment), but the present invention is not limited to this. W

The Kupin receiving portion may adopt various shapes.

For example, as another embodiment of the present invention, as shown in FIG. 6, as shown in FIG. 6, a slope may be formed at each of the tip 31 of the lock pin 9 and the lock pin receiver 32. By merely abutting each other, the lock pin 9 is engaged with the valve casing 6, and the movement of the lock pin 9 and the valve body 8 in the opening direction can be reliably stopped.

In the present embodiment, a boss 26 having a tubular shape with a bottom is employed as the lock pin operation unit. The opening edge 26 a of the boss portion 26 is in contact with the outer side surface 9 a of the lock pin 9.

In the closed position of the valve body 8 (see Fig. 1), the bottom surface 26 b of the boss 26 is slightly (for example, about 1 mm) apart from the tip 25 a of the connecting rod 25 of the valve body 8. ing. When the plunger 3 of the electromagnet 1 moves in the opening direction of the valve body 8, the opening edge 26 a of the boss portion 26 presses the lock pin 9 inward to push the lock pin 9 into the lock pin receiving portion 2. 4 (see Figure 3). Further, when the plunger 3 is further raised, the bottom surface 26 b of the boss portion 26 comes into contact with the distal end portion 25 a of the connecting rod 25 of the valve element 8 and presses the connecting rod 25. To open the valve body 8 (see Figs. 4 and 5).

In the present embodiment, the boss portion 26 has a cylindrical shape with a bottom, but the present invention is not limited to this, and various other modes can be adopted. For example, as still another embodiment of the present invention, as shown in FIG. 7A, a penetrating tubular boss portion 33 is used instead of the bottomed tubular boss portion 26. Also, a projection 35 may be provided on the outer peripheral surface of the tip of the lock pin 34. In this case, as shown in FIG. 7 (b), when the cylindrical boss 33 ascends together with the plunger (not shown), the boss 33 pushes the lock pin 34 inward. To disengage the lock pin 34 from the valve casing 6, and then the upper edge of the boss 33 engages the projection 35, and the boss 33 and the port The pin 34 can be raised.

Furthermore, as shown in FIGS. 4 and 5, around the lock pin 9 Specifically, between the lock pin 9 and the connecting rod 25, there is formed a flow path 27 through which air passes. The air can flow smoothly and accurately to the flow paths 4 and 5. In the present embodiment, as the lock mechanism, an example is described in which a lock pin is provided, which is provided with a hook pin extending inclining and a mouth pin operating section comprising a bottomed cylindrical boss. The present invention is not limited thereto, and when the plunger of the electromagnet is moved in the opening direction of the valve body, the cock pin operating section is configured to detach the mouth pin from the mouth pin receiving section. Various aspects may be employed.

For example, as still another embodiment of the present invention, as shown in FIG. 8, the lock pin receiving portion 37 may be deformed in place of the lock pin 36 to release the lip. Specifically, a lock pin 36 having a protrusion 38 extending in the horizontal direction is provided below the valve element 8. On the other hand, an opening pin receiving portion 37 made of an elastically deformable material such as a synthetic resin is provided at a lower portion of the valve casing 6, and is locked in a concave portion 39 formed in the lock pin receiving portion 37. The projection 38 of the pin 36 is engaged. Further, the lock pin receiving portion 37 is inclined such that it extends outward from the concave portion 39 as it goes downward. In the case of the solenoid valve shown in Fig. 8, when the plunger 3 is raised by energization, the corner portion 40 of the plunger 3 comes into contact with the slope inside the lock receiving portion 36 and the lock pin receiving portion 37 Push outward to disengage the lock pin 36 from the lock pin receiving part 37. After that, when the plunger 3 is further raised, the plunger 3 directly pushes up the lip pin 36 so that the valve body 8 can be opened. When the power supply is stopped, the plunger 3 and the valve body 8 are lowered, and the lock pin 36 is engaged with the lock pin receiving portion 37 again. Further, as still another embodiment of the present invention, as shown in FIGS. 9 to 11, the linear motion of the plunger 46 of the electromagnet is rotated by the twisted push pin 45 to rotate the lock pin 42. And unlocking may be performed. More specifically, FIGS. 9 and 10 show a locked state and a state in which the air ventilation path is closed. A lock pin 42 is provided below the valve body 41, and the lock pin 42 is An insertion recess 48 having an opening having a rectangular cross section is formed at the center.

As shown in FIG. 9, a twisted push pin 45 fixed to the tip of the plunger 46 of the electromagnet similar to that of the above-described embodiment is inserted into the insertion recess 48. The twisted push pin 48 is manufactured by spirally twisting a thin plate made of steel or the like. The push pin 48 is not limited to a thin plate, but may be a twisted rod-shaped member.

A lock pin receiving portion 44 for locking both ends of the lock pin 42 is provided on the lower surface 50 of the valve casing 43.

When the electromagnet is energized, the plunger 46 rises due to the attractive force of the electromagnet, and the twisted push pin 45 becomes the lock pin 42 rectangle as shown in Figs. It is inserted into the insertion recess 48 from the opening having the shape. At this time, the lock pin 42 rotates clockwise in FIG. 11 by being pressed by the twisted push pin 45, and gradually comes off the lock pin receiving portion 44, and the lock pin shown in FIG. It will be released. From the unlocked state shown in FIG. 11, the plunger 46 is further raised, and the valve element 41 is pushed up via the twisted push pin 45. At this time, the lock pin 42 stops at a position near the lower surface 50 of the valve casing 43. As a result, the air passage of the solenoid valve is completely opened, and air can be supplied.

Also, if the power is turned off, the valve is actuated by the biasing force of the compression coil spring 47. The body 41, the lock pin 42, the twisted push pin 45 and the plunger 46 are lowered at the same time, and the valve body 41 is closed. As the push pin 45 and the plunger 46 are further twisted down, the lock pin 42 rotates counterclockwise in FIG. 3, and the lock pin 42 again comes into contact with the lip pin receiving portion 4 4. Engaged.

As an example of use of the electromagnetic valve of the present embodiment, for example, when supplying air to an air mat, the flow path 4 of the valve casing 6 communicates with the air pump, and the flow path 5 of the valve casing 6 is connected to the air mat. Communicated.

Next, the operation of the electromagnetic valve according to the present embodiment will be described with reference to FIG. 1 and FIGS.

First, as shown in FIG. 1, when the excitation coil 2 of the electromagnet 1 is not energized, the gap between the tip 25 a of the connecting rod 25 and the bottom 26 b of the boss 26 at the tip of the plunger 3. Are spaced apart, forming a void 28 (for example, about 1 mm). At this time, since the distal end portion 23 of the lock pin 9 is engaged with the lock pin receiving portion 24, the valve body 8 is locked so as not to move in the opening direction. As a result, the valve element 8 is not affected by external negative pressure or positive pressure, and no air leakage from the valve element 8 or vibration of the valve element 8 occurs. Specifically, when pressure is applied from the air mat side by, for example, a person getting on the air mat, air leakage is prevented by the sealing material 11, while negative pressure is generated by, for example, suddenly getting down from the air mat. Even if it acts on the valve body 8, the upward movement (in FIG. 1) of the valve body 8 is locked by the engagement of the lock pin 9 and the lock pin receiving portion 24, and air leakage is prevented.

Next, when the exciting coil 2 of the electromagnet 1 is energized with the valve body 8 shown in FIG. 1 closed, the yokes 13, 14, and 15 are magnetized, and the plunger 3 absorbs the bow I. The boss 26 at the tip of the plunger 3 is linearly driven in the direction of arrow A (see Fig. 3). At this time, the lock connected to the valve 8 The locked state between the tip 23 of the pin 9 and the lock pin receiving part 24 is released. Specifically, as shown in FIG. 3, as the tip 25a of the connecting rod 25 approaches the bottom surface 26b of the boss portion 26, the opening 緣 26a of the boss portion 26 9 is pressed inward, whereby the locked state between the distal end portion 23 of the lock pin 9 and the lock pin receiving portion 24 is released.

Further, as shown in FIG. 4, when the plunger 3 is raised, the bottom surface 26 b of the boss portion 26 abuts on the tip portion 25 a of the connecting rod 25, and the valve body 8 is positioned at a predetermined position (2 Up to about 3 mm). As a result, the air from the pump can be supplied to the air mat for a predetermined time by opening the passages 4 and 5 and the through hole 8a of the valve element 8. When the air pine 1 is inflated to a predetermined pressure, the power supply to the electromagnet 1 is stopped. At that time, the urging force of the compression coil spring 10 in the valve casing 6 moves the valve body 8 in the direction of the plunger 3 so that the sealing material 11 and the valve seat 21 are in close contact with each other and the flow paths 4, 5 are formed. Close and shut off the air supply. At the same time, the distal end portion 23 of the lock pin 9 re-engages with the lock receiving portion 24, and the locked state can be maintained until the next energization. As described above, since the electromagnetic valve of the present invention has the lock mechanism for locking the valve body of the movable valve to the closed position, air leakage or vibration noise due to external negative or positive pressure such as an air mat is generated. Generation can be prevented, and the valve can be opened and closed smoothly and accurately.

Therefore, the biasing force of the compression coil spring can be set small, and a small and inexpensive electromagnetic valve with low power consumption can be provided. Industrial applicability

The electromagnetic valve of the present invention can be used for applications such as air massaging, a bedsore prevention mat, and a pneumatic actuator, in addition to switching between supply and exhaust of a fluid to an air mat.

Claims

Scope of Word

1. An electromagnet having a plunger, and a movable valve having a valve disposed in a valve casing, wherein the plunger linearly drives the valve of the movable valve by the attraction force of the electromagnet. According to the electromagnetic valve for opening and closing the flow path in the valve casing,

An electromagnetic valve, comprising: an opening mechanism for locking a valve body of the movable valve at a closed position.

2. The lock mechanism is

(a) at least one lock pin connected to the valve body and urged toward an inner surface of the valve casing;

(b) a lock pin receiving portion formed on the inner surface of the valve casing and capable of engaging with the tip of the lock pin when the valve body is in the closed position;

(c) a lock pin operation section provided at the tip of the plunger of the electromagnet;

2. The lock pin operation section according to claim 1, wherein the lock pin operation section detaches the lock pin from the mouthpiece pin receiving section when the plunger of the electromagnet moves in the opening direction of the valve body. Electromagnetic valve.

3. The lock pin is inclinedly connected to the axial direction of the connecting rod on the distal end side of the connecting rod extending from the valve body toward the plunger,

The lock pin operating portion is formed of a boss having a cylindrical shape with a bottom, and an opening edge of the boss contacts an outer surface of the lock pin,

In the closed position of the valve body, the bottom surface of the boss is separated from the tip of the connecting rod of the valve body,

When the plunger of the electromagnet moves in the opening direction of the valve body, The opening edge of the boss presses the lip pin inward to release the lip pin from the lock pin receiving portion, and the bottom surface of the boss presses the connecting rod of the valve body. 3. The electromagnetic valve according to claim 2, wherein the valve body is opened.

4. A flow path is formed around the lock pin of the valve body.

Item 2. The electromagnetic valve according to item 2 or 3.