JP2000081162A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure and reduce the size by connecting an elastic membrane member having a through-hole forming a part of a passage and supported displaceably along the moving direction of a fluid to a valve element made of magnetic body opened and closed by an electromagnetic driving means. SOLUTION: A power is supplied to an exciting coil 42 for a prescribed period to lay it in the excited state. Consequently, repulsive force is generated between a valve element 46 made of magnetic body and a valve seat part 40d, and a membrane member 44 and the valve element 46 are separated to the valve seat part 40d by a prescribed distance, for example, about 0.3 mm. Accordingly, a prescribed quantity of ink is discharged to a passage through through- holes 44a, 44b and the clearance between the outside surface and inside surface of the valve element 46 along the arrowed direction. When the supply of power to the exciting coil 42 is stopped, the valve element 46 is moved by the elastic force of the membrane member 42 and the pressure of ink, and its tip makes contact with the valve seat 40d. And a discharge passage 48 is thus laid in the closed state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device for controlling the opening and closing of a flow path.

[0002]

2. Description of the Related Art As a valve device for controlling the opening and closing of a flow path through which a fluid is transferred, a solenoid valve is widely used in practice. As shown in Japanese Patent Application Laid-Open No. 9-89146, the solenoid valve has a two-port system. For example, as shown in FIG. 19, an inlet port 14a and an outlet port 16a arranged on a common center axis. And a plunger 8 as a valve body for selectively opening and closing a flow path formed in the main body 4, and a plunger 8 provided on an upper surface of the main body 4. And a coil unit 2 that selectively excites and moves.

The main body 4 has a first flow path 14 having one end communicating with the inlet port 14a and the other end communicating with the connecting passage 12 through the through hole 14b, and a first end communicating with the outlet port 16a and the other end being connected. The first flow path 14 through the passage 12 and the through hole 16b
And a second flow path 16 leading to the inside.

When the plunger 8 closes the space between the first flow path 14 and the second flow path, a flange formed at the lower end of the plunger 8 is formed around the periphery of the through hole 14b. The contact is made by the urging force.

[0005] The coil portion 2 has a through hole in which the plunger 8 and the auxiliary plunger 6 made of a magnetic material are inserted at substantially the center. An excitation coil 2a for selectively moving the plunger 8 is housed around the through hole. Further, a pressure chamber PC to which the pressure of a pipe connected to the inlet port 14a is supplied via a passage RA is provided at an upper portion of the coil unit 2. Further, the pressure chamber PC is provided inside the pressure chamber PC.
An auxiliary plunger 6 for transmitting the internal pressure to the plunger 8 is provided. The space between the pressure chamber PC and the through hole of the coil section 2 is sealed by a seal member OS.

In this configuration, when the fluid is supplied in the direction indicated by the arrow, the exciting coil 2a is excited, and the plunger 8 is moved upward against the urging force of the coil spring 10. At this time, the communication between the first flow path 14 and the second flow path 16 causes the entrance port 14 a
Will be discharged from the outlet port 16a.

On the other hand, when the exciting coil 2a is not excited, the plunger 8 is located between the first flow path 14 and the second flow path 16.
And is closed by the flange portion.

In the solenoid valve as shown in FIG. 19, the direction of movement of the plunger 8 as a valve body is set to a direction substantially orthogonal to the common center axis of the inlet port 14a and the outlet port 16a. For example, JP-A-7-2
As shown in Japanese Patent No. 43542 and FIG. 20, there has been proposed an arrangement in which the direction of movement of the plunger 34 is set to a direction along a common central axis of the inlet port 20b and the outlet port 20a.

In the example shown in FIG. 20 of a two-port system, an inlet port 20b and an outlet port 20a
A plunger 34 movably disposed in the driving portion accommodating chamber 24 of the main body case 20 to open and close the spherical valve body 28 with respect to the communication passage 22 a via the connecting member 32; Arranged around, communication path 2
Coil housing 30 for accommodating exciting coil portion 30a for moving plunger 34 to open 2a
And the driving unit housing chamber 24 and the valve body housing chamber 2 of the main body case 20
And a spherical valve element 28 that opens and closes a communication path 22a that communicates with the valve element 2.

The main body case 20 receives the fluid supplied along the direction indicated by the arrow shown in FIG.
And the communication passage 22a
And a valve body accommodating chamber 22 that communicates with the drive unit accommodating chamber 24 through the outlet port and discharges fluid through the outlet port 20a. As a result, a flow path is formed by the drive unit housing chamber 24, the communication passage 22a, and the valve body housing chamber 22.

In the valve housing chamber 22, a spherical valve body 28 is provided.
A coil spring 26 for urging the communication path 22a to close the communication path 22a is provided.

Even with such a configuration, when the fluid is supplied in the direction indicated by the arrow, the exciting coil 30a
Is excited, the plunger 34 is moved upward against the urging force of the coil spring 26, and the drive unit housing chamber 24 and the valve body housing chamber 22 communicate with each other.
The fluid introduced into the inlet port 20 b is
4. It is discharged from the outlet port 20a through the communication passage 22a and the valve body housing chamber 22.

[0013]

In a solenoid valve, for example, in order to be incorporated in an apparatus, the total length and the outer diameter are relatively small, for example, the total length and the outer diameter are each 10 m.
m or less, preferably 5 mm or less.

However, in a solenoid valve as shown in FIGS. 19 and 20, the overall length is 40 to 70 mm or more, and the outer shape is 30 to 60 mm or more.

One of the reasons why it is difficult to reduce the size of the solenoid valve is that the coil springs 10 and 26 are used as urging means for returning the plungers 8 and 34, respectively, in the main body 4 or in the flow path. There is a limit to the relatively small diameter of the coil springs 10 and 26, which is arranged in the valve body accommodating chamber 22 that is formed as a part of the passage, and supports the coil springs 10 and 26. This is because a plurality of components are required.

As another reason, as shown in FIG. 19, the moving direction of the plunger 8 is changed to the inlet port 14a.
When the coil portion 2 is substantially perpendicular to the common center axis of the outlet port 16a, the coil portion 2 can be moved closer to the common center axis to secure the amount of movement of the plunger 8 and the storage of the coil spring 10. Therefore, a case for attaching the coil unit 2 to the main body unit 4 is separately required. On the other hand, as shown in FIG. 20, when the moving direction of the plunger 34 is a direction along the common central axis of the inlet port 20b and the outlet port 20a, the coil housing 30 And the excitation coil 30a and the coil housing 30 are relatively small.
In addition, since a plurality of components such as the connecting member 32 and the plunger 34 are required to open and close the spherical valve body 28 with respect to the communication passage 22a, the occupied volume of the driving unit housing chamber 24 is relatively small. This is because it becomes difficult.

Further, as another reason, the plunger 8
And 34 are movably supported by the through holes of the coil portions 2 and 30, respectively, so that the exciting coils 2a
And 30a and the coil case for accommodating the exciting coils 2a and 30a, respectively, must be made as separate parts, so that the structure becomes complicated.

In view of the above problems, an object of the present invention is to provide a valve device for controlling the opening and closing of a flow path, which can simplify the structure and achieve a remarkable miniaturization. .

[0019]

In order to achieve the above-mentioned object, a valve device according to the present invention is provided with a valve body which is disposed in a flow path through which a fluid is moved, is made of a magnetic material, and opens and closes the flow path. ,
An elastic membrane-shaped member having a through hole forming a part of the flow path and connected to the valve body and supported so as to be displaceable along the moving direction of the fluid; and Electromagnetic driving means for performing an opening and closing operation.

The magnetic material may be a ferromagnetic material or a soft magnetic material.

[0021]

FIG. 2 shows a first embodiment of a valve device according to the present invention, together with an ink tank to which the valve device is applied.

In FIG. 2, the ink tank includes, for example, an ink tank case 38 for storing a predetermined amount of ink INK supplied at a predetermined timing to a recording unit of an ink jet recording apparatus (not shown); Arranged in a cylindrical portion 38VH provided at the bottom of the
A valve device 36 for discharging the ink in the ink tank case 38 by a predetermined amount.

The ink tank case 38 has an air communication hole 38h in the upper part for communicating the inside air and the outside air.

As shown in FIGS. 1B and 2, the valve device 36 is fitted in the cylindrical portion 38VH and
8, a valve body 46 for controlling opening and closing of a discharge path 48 of the valve body 40, and an inner surface portion of the valve body 40 whose substantially central portion is connected to one end of the valve body 46 and whose peripheral portion is in contact with ink. And a film-like member 44 joined by welding.

As shown in FIG. 1B and FIG. 3, the valve body 40 is formed by rolling a general structural rolled steel as a low carbon steel containing about 0.1% of carbon by machining. It is obtained by being cut. The material of the valve body 40 is desirably, for example, a metal material (manufactured by Tohoku Special Metal: KM) generally referred to as electromagnetic stainless steel as a soft magnetic material.
60), and those having relatively high magnetic permeability are preferable. The maximum height Ha and the maximum outer diameter Da are about 5.6 (mm) and about 5.2 (mm), respectively. Further, a ring-shaped portion 40h around which the exciting coil 42 is wound is formed in a portion of the valve main body 40 fitted to the cylindrical portion 38VH. The exciting coil 42 has a wire diameter of 40 (μm).
For example, a film-shaped member 44 described later is welded to the valve body 40 by a known automatic winding machine using a copper wire material (manufactured by Hitachi Cable: dielectric breakdown voltage 50 V), and then wound around the ring-shaped portion 40h. The reason why the excitation coil 42 is wound after the film-shaped member 44 is fixed to the valve body 40 is to prevent the excitation coil 42 from being cut off by an instantaneous current in spot welding or to prevent insulation breakdown. is there. The excitation coil 42 has an insulating coating layer of polyethylene and urethane. The excitation coil 42
Is electrically connected to a valve drive circuit (not shown) via a lead wire 42a.

At the center of the inner surface of the valve body 40, an inclined surface 40a to be in contact with a film-like member 44 described later, an inner peripheral surface 40b connected to the inclined surface 40a and into which a valve body 46 described later is inserted, A valve seat portion 40d extending from the inner peripheral surface portion 40b and serving as a truncated conical surface, and a passage 40e having a relatively small diameter with one end opened in a space surrounded by the inner peripheral surface portion 40b and the valve seat portion 40d are formed. I have.

The diameter of the inner peripheral surface portion 40b is set to be larger than the diameter of the valve member 46, for example, so that a predetermined gap is formed between the outer peripheral surface of the valve member 46 and the inner peripheral surface portion 40b described later. .

The large end diameter of the conical surface of the valve seat 40d is the same as the diameter of the inner peripheral surface 40b, and the small end diameter of the conical surface of the valve seat 40d is the same as the inner diameter of the passage 40e. You. Further, the taper angle of the conical surface of the valve seat 40d is
The angle is set to be the same as the angle of a pointed tip of a valve body 46 described later that is selectively brought into contact with 0d. Passage 40e
Is, for example, about 0.6 (mm).

After machining, the valve body 40 is subjected to nickel plating as a surface treatment. The plating film thickness is
For example, it is about 10 (μm).

As shown in FIG. 1A, a film-like member 4 is provided on the upper end surface of the valve body 40 which is continuous with the slope 40a.
The annular portion 4 is fixed by spot welding. The spot welding is performed by, for example, energizing under the conditions of 250 (A) and 40 (V) for 0.01 to 0.02 seconds. At this time, an electric insulating member is interposed between a valve body 46 and a valve seat 40d described later.

As shown in FIGS. 4A and 4B, the film member 44 having elasticity has a plurality of through holes 44.
a and 44b each having a curved surface portion 44 interspersed therewith
B and an annular flat surface portion 44A extending in the circumferential direction following the curved surface portion 44B. Membrane member 44
For example, a flat surface portion 44A and a curved surface portion 44B are simultaneously formed by pressing a thin steel plate having a thickness of about 0.15 (mm). The through holes 44a and 44b are
8, and the diameter of the through hole 44a is set to be larger than the diameter of the through hole 44b. The through holes 44b are formed between adjacent through holes 44a. Further, the film-like member 44 is formed by pressing
For example, an electrolytic barrel plating process in which plating is performed while deburring is performed, and after a copper plating process of a film pressure of about 0.5 to 1 (μm), a film pressure of about 10
(Μm) nickel plating is applied.

Further, the size of the through holes 44a and 44b can be made to be about 4 to less than 80 (μm) by photoetching or laser processing. Thus, the film-like member 44 filters the ink by having a filter function.

As shown in FIG. 5, the base end of a cylindrical valve body 46 is spot-welded to a surface of the curved surface portion 44B at a substantially central portion facing the valve seat portion 40d. The valve body 46 is obtained by, for example, machining a cylindrical shape with an iron alnico magnet (manufactured by Hitachi Metals) and then performing a nickel plating process at a film pressure of about 50 (μm). The iron alnico magnet preferably has a relatively low residual magnetic field of about 100 gauss.

The distal end 46B of the valve body 46 is formed in a pointed shape corresponding to the valve seat 40d. Further, the columnar portion 46A of the plated valve body 46 is disposed at a substantially central portion of the curved surface portion 44B under a condition of 25 (V) and 100 (A) for a predetermined short period, for example, 0.01 to 0.02. It is energized for seconds and joined by spot welding. Accordingly, the discharge passage 48 is formed by the space surrounded by the through holes 44a and 44b of the film-like member 44 and the inner peripheral surface 44b, and the passage 40e.

Under such a configuration, the exciting coil 42
Power supplied for a predetermined period, for example, voltage 24 (V),
Excited by the current 0.20 (A), a repulsive force is generated between the valve body 46 and the valve seat portion 40d, so that the membrane member 44 and the valve body 46 are shown by a two-dot chain line in FIG. As shown in FIG. 3, the valve seat 40d is separated from the valve seat 40d by a predetermined distance, for example, about 0.3 (mm). As a result, the ink flows through the passages 40a and 44b along the direction indicated by the arrow and through the gap between the outer peripheral surface and the inner peripheral surface 40b of the valve body 46.
A predetermined amount is discharged to e.

When the supply of electric power to the excitation coil 42 is stopped, the valve body 46 is moved by the elastic force of the film-like member 44 and the pressure of the ink, and the tip 46B of the valve 46 contacts the valve seat 40d. Will be touched. As a result, the discharge path 48 is closed.

When the valve body 46 is made of the above-mentioned soft magnetic material of the electromagnetic stainless steel, when the exciting coil 42 is in a non-excited state, the valve body 46 is moved 0.1 m from the valve seat 40d.
In the configuration set to be in a state of floating about m, the above-described discharge path 48 may be blocked by the valve body 46 by setting the excitation coil 42 to the excitation state.

In this case, when the supply of electric power to the exciting coil 42 is stopped and the exciting coil 42 is in a non-excited state, the valve body 46 is separated from the valve seat 40d, so that the discharge path 48 is formed. It is again opened.

Therefore, the flat surface portion 44A of the film member 44 is not accommodated in the valve body 40, and the valve body 4
0, the curved surface portion 44B of the membrane member 44 forms a part of the flow path, and the valve body 46 is joined to the curved surface portion 44B of the membrane member 44. Reduced. Further, since the exciting coil 42 is not provided in the flow path, the size can be easily reduced.

A gap is formed as a flow path between the outer peripheral portion of the valve body 46 shown in FIG. 1 and the inner peripheral surface portion 40b of the valve body 40. However, the present invention is not limited to this example. As shown in FIG. 5, the outer peripheral portion of the valve body 50 is fitted to the inner peripheral surface 50b of the valve body 50 with a loose fit.
Further, the valve body 50 may have a cutout 54b having an arc-shaped cross section and a passage 54a as a flow path through which the ink is guided. In FIG. 6 and other examples described later,
In the example illustrated in FIG. 1, the same components are denoted by the same reference numerals, and the description thereof will not be repeated.

The valve body 50 is composed of a columnar portion joined by welding to a curved surface portion of a film-like member 52 having a shape similar to that of the above-described example, and a pointed tip portion.

Further, inside the valve body 50, a slope 50a, an inner peripheral surface 50b, and
A valve seat portion 50d to which the distal end portion of the valve body 50 selectively contacts is formed. One end of a passage 50e is open in the valve seat 50d.

Thus, the discharge passage 56 is formed by the passage 54a, the notch 54b, and the passage 50e.

With this configuration, the valve element 5
0, for example, without moving the ink through the passage 54a, the notch 54b, and the passage 50e without moving the ink by a relatively large predetermined distance St.
Can be discharged. The moving distance St depends on the type of the fluid (liquid and gas), but is, for example, about 0.01 to 0.3 mm.

FIGS. 7A, 7B, and 7C
2 shows a main part of a second embodiment of the valve device according to the present invention.

In FIG. 7, in the example shown in FIG. 1, the membrane member 44 is joined to the valve body 40 and the valve body 46 by spot welding, but instead, the membrane member 58 is caulked and fastened. Thereby, the valve body 60 and the valve body 64 are fastened to each other.

As shown in FIG. 8, the valve body 60 does not form a residual magnetic field even when a strong magnetic field is applied.
For example, a paramagnetic ferrite having relatively high magnetic permeability and polypropylene may be used to form a permanent magnet.
A mixture of 5:15 is obtained by injection molding. The maximum height Ha and the maximum outer diameter Da are, for example, about 2.8 (mm) and about 2.65 (mm), respectively.

The valve body 60 may be formed of a soft magnetic material by cold forging.

When injection molding a mixture of plastic and ferrite powder, the surface of the powder is to be thinly coated with plastic. Preferably, nickel plating, precious metal plating, polyethylene, nylon, Surface treatment with polypropylene or the like is preferably performed on the molded product.

The cylindrical portion 38 of the valve body 60
A ring-shaped coil accommodating portion 60h around which the exciting coil 62 is wound is formed in a portion fitted to the VH. The coil accommodating portion 60h includes an upper end surface described later, a slope portion 60a,
It is formed so as to be circumferentially surrounded by an inner wall surface substantially parallel to the valve seat portion 60d and the passage 60e.
Therefore, the volume of the internal space of the coil housing portion 60h is as shown in FIG.
Since the size of the coil is larger than the volume of the internal space of the coil accommodating portion 40h of the valve body 40 shown in FIG. You will have more power.

The exciting coil 62 is made of a copper wire material having a wire diameter of 60 (μm) (manufactured by Hitachi Cable: dielectric breakdown voltage 50 V), and is wound around the coil accommodating portion 60h by a known automatic winding machine, for example. The excitation coil 62 has an insulating coating layer of polyethylene and urethane. The excitation coil 62
Is electrically connected to a valve drive circuit (not shown) via a lead wire 62a, as shown in FIG.

At the center of the inner surface of the valve body 60, as shown in FIG. 8, a slope 60a to be in contact with a later-described film-like member 58 and a valve body 64 connected to the slope 60a and described later are inserted. Inner peripheral surface portion 60b, a valve seat portion 60d extending from the inner peripheral surface portion 60b and serving as a truncated conical surface, and an inner peripheral surface portion 60
A passage 60e having a relatively small diameter and having one end opened is formed in a space surrounded by the valve seat b and the valve seat 60d.

The diameter of the inner peripheral surface 60b is set larger than the diameter of the valve 64, for example, so that a predetermined gap is formed between the outer peripheral surface of the valve 64 and the inner peripheral surface 60b, which will be described later. .

The large end diameter of the conical surface of the valve seat 60d is the same as the diameter of the inner peripheral surface 60b, and the small end diameter of the conical surface of the valve seat 60d is the same as the inner diameter of the passage 60e. You. Further, the taper angle of the conical surface of the valve seat 60 d is
The angle is set to be the same as the angle of a pointed tip of a valve body 64 described later that is selectively brought into contact with 0d. Passage 60e
Is, for example, about 0.25 (mm).

As a result, the discharge passage 66 is formed by a space surrounded by the through holes 58a and 58b of the membrane member 58 described later, the valve seat portion 60d and the inner peripheral surface portion 60b, and the passage 60e.

As shown in FIGS. 7 and 8, each of the through holes 58 of the annular portion of the membrane member 58 is inserted into each of the rivet portions 60r on the upper end surface connected to the slope portion 60a of the valve body 60. And is fixed by being caulked with ultrasonic waves.

The rivet portions 60f may be tightly fitted or shrink-fitted in each through hole 58, or may be fixed with an adhesive, without being limited to caulking.

As shown in FIGS. 7A and 7B, the membrane member 58 having elasticity has a plurality of through holes 58.
a and 58b each having a curved surface portion 58 interspersed therewith
B and an annular flat surface portion 58A extending in the circumferential direction following the curved surface portion 58B.

The film member 58 has a thickness of, for example, 0.065.
The flat surface portion 58A and the curved surface portion 58B are simultaneously formed by a press process using a thin nickel plate of about (mm).
In addition, the film-shaped member 58 is not limited to a nickel plate, and has a thin and elastic deformation range such as a phosphor bronze plate or a stainless steel plate, and has a punching process, a laser process, and a corrosion-resistant surface treatment. Any material that can be used may be used.

The through holes 58a and 58b form a part of the discharge passage 66, and the diameter of the through hole 58a is
The size is set to be larger than the diameter of the through hole 58b. The through holes 58b are formed between adjacent through holes 58a.

As shown in FIG. 7 (C), a rivet 60r at the base end of the cylindrical valve body 64 has a through hole on the surface of the curved surface portion 58B substantially opposite to the valve seat portion 60d. 58h and joined by caulking.

When the above-described repulsive force is used, the valve body 64 is obtained in a substantially cylindrical shape by injection molding, for example, using a mixture of ferrite or magnetic iron powder and high-density polyethylene. The distal end 64B of the valve body 64 is formed in a pointed shape corresponding to the valve seat 60d. The proportion of ferrite or magnetic iron powder in the mixture is about 80% by weight
Degree. In addition, without being limited to ferrite,
Injection molding is possible, has a residual magnetic field, and has the property of being spontaneously magnetized. For example, iron / Nd / B alloy powder, samarium / cobalt alloy, iron / cobalt alloy, iron / nickel / cobalt alloy And so on. At this time, the value of the highest residual magnetic field due to spontaneous magnetization described later must be adjusted.

On the other hand, when the above-mentioned attractive force is used, the residual magnetic field of the valve body 64 is zero or
It is very low and preferably near zero.

Next, the molded valve body 64 is spontaneously magnetized with a strong magnetic field of, for example, about 500 Gauss. Therefore, the valve body 64 as a permanent magnet having a relatively high residual magnetic field is obtained.

The resin material mixed with the ferrite or magnetic iron powder may be any material that can be injection-molded together with ferrite or the like, and may be, for example, silicon rubber, butyl rubber, polystyrene, polyester, polyacetal, or the like.

In this example, as in the above example,
The exciting coil 62 is excited by the supplied power for a predetermined period, and a repulsive force is generated between the valve body 64 and the valve seat portion 60d.
Is separated from the valve seat 60d by a predetermined distance. As a result, a predetermined amount of ink is discharged into the passage 60e through the through holes 58a and 58b and the gap between the outer peripheral surface and the inner peripheral surface 60b of the valve body 64.

When the supply of electric power to the exciting coil 62 is stopped, the valve body 64 is moved by the elastic force of the film member 58 and the pressure of the ink, and the front end 64B of the valve 64 contacts the valve seat 60d. Will be touched. As a result, the discharge path 66 is closed.

FIG. 9 shows a third embodiment of the valve device according to the present invention.

In FIG. 9A, FIG. 1 and FIG.
In the example shown in FIG. 3, the valve body 40 including the valve body 46 is provided directly on the ink tank case 38, but instead, the valve body 40 including the valve body 46 is provided inside the cylindrical holding case 70. Are installed in a predetermined pipe or a discharge pipe (not shown).

The excitation coil 42 is electrically connected to a drive circuit 72 having a reference power supply Va via a holding case 70 via a lead wire 42a. The holding case 70 is preferably formed of a resin material, for example, low-density polyethylene that is a material having a relatively low melting point, but may be high-density polyethylene, polypropylene, or nylon.

The maximum height H′a and the maximum outer diameter D′ a of the valve body 40 are, for example, about 5.6, respectively.
(Mm), about 5.2 (mm).

As described above, the valve body 40 including the valve body 46
Is arranged inside the cylindrical holding case 70, so that the insert molding is facilitated, and the damage of the exciting coil 42 in the handling of the valve body 40 is avoided.

In such a configuration, when the valve body 46 is made of a soft magnetic material and the above-described attractive force is used, that is, when the exciting coil 42 is in the excited state, the valve body 46 is The discharge path 48 is closed against the urging force of the film member 44.

On the other hand, in the example shown in FIG. 9B, the valve body 46 ′ made of a soft magnetic material has a frustoconical portion 46 that selectively contacts the valve seat 40 d of the valve body 40.
A, a plate-shaped portion 46C selectively abutting against an end surface 40f opposite to the end surface of the valve body 40 to which the membrane member 44 is attached, and a frusto-conical portion 46A inserted into the discharge passage 48 with a predetermined gap. And a connecting portion 46B for connecting the shape portion 46C.

In such a configuration, first, when the exciting coil 42 is in the non-excited state, as shown in FIG. 9B, the truncated conical portion 46A is fixed with respect to the valve seat portion 40d. And the plate-shaped portion 46C is
The end surface 40f contacts the periphery of the opening end of the discharge path 48. Therefore, the ink stays in the gap between the ink and the connecting portion 46 </ b> B in the discharge path 48.

Next, when the exciting coil 42 is excited, the frusto-conical portion 46A comes into contact with the valve seat portion 40d, and the plate-like portion 46C has an end face as shown by a two-dot chain line. It is separated from the periphery of the open end of the discharge path 48 at 40f. Therefore, the connecting portion 46B in the discharge path 48
Is discharged through the discharge path 48. At that time, the ink stays around the truncated conical portion 46A.

Subsequently, when the exciting coil 42 is again set to the non-excited state as described above, the ink accumulated around the truncated conical portion 46A is removed by the connecting portion 46 in the discharge path 48.
B will stay in the gap with B.

Therefore, the opening / closing cycle of the valve element 46 ′ is, for example,
In the case of about 0.1 second, a predetermined amount of ink is discharged to the outside in about 0.1 second by the discharge path 48, and a predetermined amount of ink around the truncated cone 46A is discharged. 48.

In this example, the exciting coil 42
When it is necessary to discharge a larger amount of ink than the amount of ink measured by the discharge path 48 when is excited, a flow path penetrating into the truncated conical portion 46A may be provided. .

FIG. 10 shows a fourth embodiment of the valve device according to the present invention.

In FIG. 10, the example shown in FIG.
The valve body 40 including the valve body 46 is a cylindrical holding case 7
The valve body 40 including the valve element 46 is provided in a predetermined pipe or a discharge pipe (not shown) instead of the branch pipe 74.
It is arranged inside the holding case 74 having a. The holding case 74 includes a predetermined pipe (not shown),
Alternatively, it is installed in the discharge pipe. Holding case 74
Is preferably formed of a resin material, for example, low-density polyethylene, which is a material having a relatively low melting point, but may be high-density polyethylene, polypropylene, or nylon.

One end of the inner peripheral portion 74a of the branch pipe 74A into which ink is injected in the direction indicated by the arrow is open to the inner peripheral portion 74b of the holding case 74.

FIG. 11 shows a fifth embodiment of the valve device according to the present invention.

In FIG. 11, a valve body 80 fitted in a cylindrical portion 38VH and having a discharge path 84, a valve body 78 for controlling opening and closing of the discharge path 84 of the valve body 80, and a substantially central portion of the valve body 78 Connected to one end surface, the periphery is ink IN
And a film-shaped member 76 joined to the inner surface of the valve body 80 in contact with K by welding.

The valve body 80 is obtained, for example, as a low-carbon steel containing about 0.1% of carbon, which is cut into a cylindrical shape by machining with rolled steel for general use. However, the material is
A material that does not leave a residual magnetic field as much as possible is preferable. As such a material, for example, the above-described electromagnetic stainless steel (KM
60. KM35 (made by Tohoku Special Steel). When the valve body 80 is made of this material, it is 0.2 to 0.3.
The fact that the ink can be opened and closed at a pressure of (atm) has been verified by experiments performed by the present inventors.

The cylindrical portion 38 of the valve body 80
A ring-shaped portion 80h around which the exciting coil 82 is wound is formed at a portion fitted to the VH. Excitation coil 82
Is a wire diameter of 40 (μm) (manufactured by Hitachi Cable: Dielectric breakdown voltage 5
For example, after a film-shaped member 76 described later is welded to the valve main body 80 by a known automatic winding machine using a copper wire material of 0 V), it is wound around the ring-shaped portion 80h.

After the film-shaped member 76 is fixed to the valve body 80, the exciting coil 82 is wound so as to prevent the exciting coil 82 from being cut or dielectrically broken down by an instantaneous current flowing in spot welding. To do that. The excitation coil 82 has an insulating coating layer of polyethylene and urethane. The excitation coil 82
Is electrically connected to a valve drive circuit (not shown) via a lead wire 82a.

A discharge passage 84 is formed at the center of the inner surface of the valve body 80. The discharge passage 84 having a relatively small diameter has one end opened to a valve seat portion 80d which is selectively closed by one end surface of a valve body 78 described later.

After machining, the valve body 80 is subjected to nickel plating as a surface treatment. The plating film thickness is
For example, it is about 10 (μm). The plating may be, for example, gold or platinum plating. The surface treatment may be, for example, a coating of polyethylene or Teflon.

An annular portion of the membrane member 76 is fixed by spot welding around the valve seat 80d of the valve body 40. At this time, spot welding is performed on a valve body 7 described later.
8 and a valve seat 80d with an electrically insulating member interposed therebetween.

The elastic membrane member 76 is composed of a curved surface portion 76B having a plurality of through holes 76a and 76b, respectively, and an annular flat surface portion 76A connected to the curved surface portion 76B and extending in the circumferential direction. I have. The film-shaped member 76 has a flat surface portion 76A and a curved surface portion 76B formed simultaneously by pressing a relatively thin nickel plate, for example. Each of the through holes 76a and 76b is formed along the circumferential direction to form a part of the discharge path 84, and the diameter of the through hole 76a is
The size is set to be larger than the diameter of 6b. The through hole 76b is formed between adjacent through holes 76a.

The base end of a cylindrical valve body 78 is spot-welded to the surface of the curved surface portion 76B substantially opposite to the valve seat portion 80d at the center thereof. The valve body 78 is obtained by, for example, machining a cylindrical shape with an iron alnico magnet (manufactured by Hitachi Metals) and then performing nickel plating.

Under such a configuration, the exciting coil 82
Excited by the supplied power for a predetermined period,
When the repulsive force is generated between the valve body 78 and the valve seat 80d, the film-shaped member 76 and the valve body 78 are separated from the valve seat 80d by a predetermined distance as shown by a two-dot chain line in FIG. Separated. As a result, a predetermined amount of ink is discharged to the discharge path 84 in the direction indicated by the arrow through the through holes 76a and 76b and the gap between the one end surface of the valve body 78 and the valve seat 80d.

When the supply of electric power to the excitation coil 82 is stopped, the valve body 78 is moved by the elastic force of the film-like member 76 and the pressure of the ink, and one end surface thereof comes into contact with the valve seat portion 80d. Will be done. Thereby, the discharge path 8
4 is closed.

The valve 78 is made of a soft magnetic material.
In the case of utilizing the above-described attractive force, the exciting coil 8
When the excitation coil 82 is not energized, the initial state is assumed to be a state shown by a two-dot chain line in FIG. 11, and when the excitation coil 82 is excited, the state shown by a solid line in FIG. State.

In this case, for example, when the valve body 78 and the valve body 80 are made of KM60 (made by Tohoku Specialty Steel),
It is possible to open and close the ink on which a pressure of about 0.15 atm acts.

FIG. 12 shows a sixth embodiment of the valve device according to the present invention.

In FIG. 12, in the example shown in FIG. 11, the valve body 78 and the membrane member 76 are formed as separate parts and connected to each other by welding.
6, a valve body 86V is integrally formed at a substantially central portion of one end face.

In FIG. 12, a valve body 90 fitted in a cylindrical portion 38VH and having a discharge passage 92, and a valve body portion 86V for controlling the opening and closing of the discharge passage 92 of the valve body 90 are formed substantially at the center, and the periphery is formed. The part includes a film-like member 86 that is fastened to the inner surface of the valve body 90 by caulking.

The valve body 90 is injection-molded, for example, with a mixture of polypropylene containing 85% by weight of paramagnetic ferrite having a relatively high magnetic permeability, so that the maximum outer diameter is about 3.2 ( mm) with a maximum height dimension of about 2.5 (mm). Further, a ring-shaped portion 90h around which the exciting coil 88 is wound is formed in a portion of the valve main body 90 fitted to the cylindrical portion 38VH. The exciting coil 88 is made of a copper wire material having a wire diameter of 30 (μm) (manufactured by Hitachi Cable; dielectric breakdown voltage: 50 V).
After being caulked and fastened, it is wound around the ring-shaped portion 90h. The excitation coil 88 has an insulating coating layer of polyethylene and urethane. In addition, the excitation coil 88
It is electrically connected to a valve device drive circuit (not shown) via a lead wire 88a.

A discharge passage 92 is formed at the center of the inner surface of the valve body 90. The discharge passage 92 has a relatively small diameter, and one end thereof is opened to a valve seat portion 90d selectively closed by one end surface of a valve body portion 86V described later.

One end face of the membrane member 86 is abutted around the valve seat section 90d of the valve body 40, and each rivet section 90a is inserted into each through hole 86d of the end face.
It is fixed by being swaged.

The elastic membrane member 86 is formed in a thin plate shape having a plurality of through holes 86a and 86b scattered. The film-shaped member 86 is obtained by, for example, heating and solidifying in a predetermined shape a mixture with hydrogenated butyl chloride rubber containing 80% by weight of ferromagnetic ferrite. Each of the through holes 86a and 86b is formed along the circumferential direction to form a part of the discharge passage 92, and the diameter of the through hole 86a is smaller than the diameter of the through hole 86b. It is set to a large size. The through hole 86b
Are formed between adjacent through holes 86a.

The valve seat 9 at the approximate center of the membrane member 86
On the surface facing 0d, a cylindrical valve body 86 protrudes toward the inside of the ink tank. The valve body 86 has a diameter of about 0.8 (mm).

Under such a configuration, the exciting coil 88
Excited by the supplied power for a predetermined period,
When a repulsive force is generated between the valve body portion 86V and the valve seat portion 90d, the film-shaped member 86 and the valve body portion 86V are moved to a predetermined position with respect to the valve seat portion 90d as shown in FIG. Distance, separated. At this time, the repulsive force is, for example, about 0.05
It is about kg / cm ² .

However, since this repulsive force depends on the relationship between the opening area and the driving force, the flow rate decreases if the area where the pressure is applied is small, but the openable pressure increases.

As a result, a predetermined amount of ink is discharged to the discharge path 92 along the directions indicated by the arrows through the through holes 86a and 86b and the gap between one end surface of the valve body 86V and the valve seat 90d. .

When the supply of electric power to the exciting coil 88 is stopped, the valve body 86V is moved by the elastic force of the film member 86 and the pressure of the ink, and one end face thereof is brought into contact with the valve seat 90d. Will be touched. As a result, the discharge path 92 is closed.

FIG. 13 shows a seventh embodiment of the valve device according to the present invention.

In FIG. 13, in the example shown in FIG. 12, a flat valve seat 90d provided around the flat surface of the valve body 86V of the membrane member 86 and the open end of the discharge passage 92 of the valve body 90. Abuts the discharge passage 92, but instead, a flat surface around the valve body 93V of the membrane member 93, and a truncated square pyramid in the valve body 93V. The convex portion 93VS of the valve body 90 ′ is brought into contact with the valve seat portions 90′da and 90′db of the valve body portion 90 ′, so that the discharge path 90′b is shut off.

The method for forming the film-like member 93 and the valve body 90 'is the same as that shown in FIG.

At the center of the inner surface of the valve body 90 ',
A discharge path 90'b is formed. The discharge path 90'b is
It has a relatively small diameter, one end of which is described below.
Valve seat 90'db selectively closed by one end face of 3V
It is open to. The valve seat 90'db has a convex 93VS
Are in contact with each other.

A chamfered valve seat portion 90'da is formed on the inner peripheral surface at one end of the discharge passage 90'b. Valve seat 9
0'da is chamfered corresponding to the gradient of each inclined surface of the convex portion 93VS.

Further, the valve seat 90'd of the valve body 90 '
One end face of the film-like member 93 is abutted around b, and each rivet portion 90'a is inserted into each through-hole 93d of the end face and fixed by caulking.

With such a configuration, the contact area of the valve body 93V of the membrane member 93 with the valve seats 90'da and 90'db of the valve body 90 is larger than that of the example shown in FIG. Therefore, the sealing property of the valve body 93V is enhanced.

Under such a configuration, the exciting coil 88
Excited by the supplied power for a predetermined period,
The repulsive force is applied to the valve body 93V and the valve seats 90'da and 90'd.
b, the film-like member 93 and the valve body 93V are separated from the valve seats 90'da and 90'db by a predetermined distance as shown by a two-dot chain line in FIG. You.

As a result, the ink passes through the through holes 93a and 93b and the gap between the one end face of the valve body 93V and the valve seats 90'da and 90'db along the direction indicated by the arrow to the discharge path 90'b. It will be quantified and discharged.

When the supply of electric power to the excitation coil 88 is stopped, the valve body 93V is moved by the elastic force of the film member 93 and the pressure of the ink, and the protrusion 93V
S and the peripheral portion are brought into contact with the valve seat portions 90'da and 90'db. As a result, the discharge path 90'b is closed.

FIG. 14 shows an eighth embodiment of the valve device according to the present invention.

In FIG. 14, in the example shown in FIG. 12, a flat valve seat 90d provided around the flat surface of the valve body 86V of the membrane member 86 and the open end of the discharge passage 92 of the valve body 90. Abuts the discharge passage 92, but instead, the flat surface around the valve body 94V of the membrane member 94 and the quadrangular pyramid-shaped The convex portion 93VS comes into contact with the valve seats 96da and 96db of the valve body 96, respectively, so that the discharge passage 96b is shut off.

The method for forming the film-like member 94 and the valve body 96 is the same as that shown in FIG. 12, and a description thereof will be omitted.

A discharge passage 96b is formed in the center of the inner surface of the valve body 96. The discharge passage 96b has a relatively small diameter, and one end thereof opens to a valve seat 96db selectively closed by one end surface of a valve body 94V described later. The peripheral edge of the projection 93VS is in contact with the valve seat 96db.

A chamfered valve seat portion 96da is formed on the inner peripheral surface at one end of the discharge passage 96b. Valve seat 96d
a is chamfered corresponding to the slope of each inclined surface of the convex portion 94VS.

[0124] One end face of the membrane member 94 is abutted around the valve seat 96db of the valve body 96, and each rivet 96a is inserted into each through hole 94d of the end face.
And it is fixed by being swaged.

With such a structure, the contact area of the valve body 94V of the membrane member 94 with the valve seats 96da and 96db of the valve body 96 becomes larger than that of the example shown in FIG. The hermeticity of the body 94V is improved.

Under such a configuration, the exciting coil 88
Excited by the supplied power for a predetermined period,
When the repulsive force is generated between the valve body 94V and the valve seats 96da and 96db, the film-like member 94 and the valve body 9
4V is applied to the valve seat 9 as shown by a two-dot chain line in FIG.
It is separated by a predetermined distance from 6 da and 96 db.

As a result, a predetermined amount of ink is discharged into the discharge passage 96b along the holes 94a and 94b and the gap between one end face of the valve body 94V and the valve seats 96da and 96db in the direction indicated by the arrow. Becomes

When the supply of electric power to the excitation coil 88 is stopped, the valve body 94V is moved by the elastic force of the film member 94 and the pressure of the ink, and the convex 94V is moved.
S and the peripheral portion come into contact with the valve seat portions 96da and 96db. As a result, the discharge path 96b is closed.

FIG. 15 shows a ninth embodiment of the valve device according to the present invention.

In the example shown in FIG. 12, the membrane member 86 is provided only on one end side of the discharge passage 92 in the valve body 90. In FIG. 15, the membrane members 98 and 100 are provided. , Respectively, are provided at both ends of the discharge path 102d.

The valve body 102 is made of, for example, 85% by weight of paramagnetic ferrite having a relatively high magnetic permeability.
By injection molding with a mixture with the contained polypropylene, it can be obtained with a maximum outer diameter of about 2.8 (mm) and a maximum height of about 2.3 (mm). Also, the valve body 10
A ring-shaped portion 102h around which the exciting coil 104 is wound is formed in a portion of the second member 2 fitted to the cylindrical portion 38VH. The exciting coil 104 is made of a copper wire material having a wire diameter of 40 (μm) (manufactured by Hitachi Cable: dielectric breakdown voltage 50 V).
00 is caulked to the valve body 102 and then wound around the ring-shaped portion 102h. The excitation coil 104
It has an insulating coating layer of polyethylene and urethane. The excitation coil 104 is electrically connected to a valve drive circuit (not shown) via a lead wire 104a.

At the center of the inner surface of the valve body 102,
A discharge path 102d is formed. The discharge path 102d is
The valve body 8 has a relatively small diameter, and one end thereof is described later.
It is open to the valve seat 102e selectively closed by one end face of 6V.

The other end of the discharge passage 102d is connected to the valve body 1
Valve seat 102f selectively closed by one end face of 00V
It is open to.

One end surface of the membrane member 98 is abutted around the valve seat portion 102e of the valve body 102, and each rivet portion 102a is inserted into each through hole 98d on the end surface and swaged. It is fixed by. One end face of the membrane member 100 is in contact with the periphery of the valve seat 102f of the valve body 102, and each of the through holes 10 in the end face is contacted.
Each rivet part 102b is inserted into 0d, and is fixed by caulking.

Since the film-like member 98 and the film-like member 100 have the same structure, only the film-like member 98 will be described, and the description of the film-like member 100 will be omitted. However, the direction of the magnetic pole of the valve body 98V of the membrane member 98 and the direction of the magnetic pole of the valve body 100V of the membrane member 100 are magnetized in mutually opposite directions.

The elastic film member 98 is formed in a thin plate shape having a plurality of through holes 98a and 98b scattered respectively. The film-like member 98 is obtained by, for example, heating and solidifying in a predetermined shape a mixture with a hydrogenated butyl rubber containing 80% by weight of ferromagnetic ferrite. Each of the through holes 98a and 98b is formed along the circumferential direction to form a part of the discharge passage 102d, and the diameter of the through hole 98a is smaller than the diameter of the through hole 98b. It is set to a large size. The through hole 98
b is formed between adjacent through holes 98a.

The valve seat 1 at the approximate center of the membrane member 98
A cylindrical valve body 98V protrudes toward the inside of the ink tank from the surface facing 02e.

With such a configuration, the exciting coil 104
Is energized by the supplied power for a predetermined period, and a repulsive force is generated between the valve body 98V and the valve seat 102e and between the valve body 100V and the valve seat 102f, thereby forming a film. The member 98 and the valve body 98V, and the membrane member 10
0 and the valve body 100V are separated from each other by a predetermined distance from the valve seats 102e and 102f, respectively, as shown in FIG. At that time, according to the experiment by the inventor of the present application, the repulsive force was, for example, about 0.15 kg / cm ² .

As a result, a predetermined amount of ink is discharged into the discharge passage 102d through the through holes 98a and 98b and the gap between the one end face of the valve body 98V and the valve seat 102e in the direction indicated by the arrow, and the through hole is discharged. 100a and 100b,
It is discharged to the outside through the gap between one end face of the valve body 100V and the valve seat 102f.

When the supply of power to the excitation coil 104 is stopped, the valve body 98V moves due to the elastic force of the film member 98 and the pressure of the ink, as shown in FIG. Then, one end surface thereof is brought into contact with the valve seat portion 102e, and the valve body portion 100V is moved by the elastic force of the membrane member 100, and one end surface thereof is brought into contact with the valve seat portion 102f. As a result, the discharge path 102d is closed.

Therefore, both ends of the discharge path 102d are more reliably closed.

FIG. 16 shows a tenth embodiment of the valve device according to the present invention.

In FIG. 16, the valve body 108 fitted inside the cylindrical portion 38VH and the valve body 108
A plunger 112 having a shaft portion 112B inserted into a discharge passage 108a provided inside the central portion of the shaft portion 11;
It is configured to include a 2B rivet portion 112r and a disc-shaped valve element 110 to be caulked.

The valve body 108 is made of, for example, paramagnetic ferrite having a relatively high magnetic permeability.
By injection molding with a mixture with 5% by weight of polypropylene, the maximum height and the maximum outer diameter are about 1.2 (mm) and about 1.6 (mm), respectively. Further, a ring-shaped portion 108h around which the exciting coil 114 is wound is formed in a portion of the valve body 108 fitted to the cylindrical portion 38VH. Excitation coil 114
Is a wire diameter of 40 (μm) (manufactured by Hitachi Cable: Dielectric breakdown voltage 5
0V), for example, wound around the ring-shaped portion 108h by a known automatic winding machine. The excitation coil 114
It has an insulating coating layer of polyethylene and urethane. The excitation coil 114 is electrically connected to a valve drive circuit (not shown) via a lead wire 114a.

The valve body 108 is made of electromagnetic stainless steel (permeability 8000) or permalloy (permeability 90).
000), the productivity is slightly reduced, but when it is obtained by cutting or cold forging, the driving force is further improved.

At the center of the inner surface of the valve body 108,
One end of the discharge path 108a is open. Discharge path 108a
Around the open end of one end, a valve seat 108b with which the valve body 110 is selectively brought into contact is formed.

Shaft 112B inserted into discharge passage 108a
Is formed of a resin material, for example, polyacetal. A predetermined gap is formed between the outer peripheral portion of the shaft portion 112B of the plunger 112 and the inner peripheral portion of the discharge passage 108a. A rivet portion 112r provided at one end of the shaft portion 112B of the plunger 112 is inserted into the through hole 110a of the valve body 110 and is caulked to the valve body 110. The disk portion 112A provided at one end of the shaft portion 112B of the plunger 112 has a plurality of 112a along the circumferential direction.
Are formed.

The disc-shaped valve element 110 is obtained by, for example, heating and solidifying in a predetermined shape a mixture with hydrogenated butyl rubber containing 80% by weight of ferromagnetic ferrite.

With such a configuration, the exciting coil 114
Is energized by the supplied power for a predetermined period, and a repulsive force is generated between the valve body 110 and the valve seat 108b, so that the valve body 11
0 is separated from the valve seat 108b by a predetermined distance. At that time, according to an experiment by the inventor of the present application, the repulsion was, for example, about 0.13 kg / cm ² .

As a result, a predetermined amount of ink is discharged to the discharge passage 108a through the gap between one end surface of the valve body 110 and the valve seat 108b.

When the supply of electric power to the excitation coil 114 is stopped, the valve body 110 is moved by the pressure of the ink, and one end surface thereof comes into contact with the valve seat 110. As a result, the discharge path 108a is closed.

When the valve element 110 is formed of a spring material of a soft magnetic material, it is also possible to open and close using the above-mentioned suction force.

FIG. 17 shows an eleventh embodiment of the valve device according to the present invention.

In FIG. 17, the same components as those in the example shown in FIG. 1 are denoted by the same reference numerals, and the description thereof will not be repeated.

In FIG. 17, the valve device has a cylindrical portion 38.
Storage cases 130 and 132 fitted in the VH;
A valve element 136 for controlling the opening and closing of the discharge port 132b of the storage case 132, a membrane member 44 having a substantially central portion connected to one end of the valve element 136 and a peripheral portion joined to an inner surface of the storage case 130; , And the excitation coil 42 housed in the housing case 132.

The storage cases 130 and 132 are made of, for example, the above-described electromagnetic stainless steel (KSF) in consideration of productivity.
24 Tohoku Specialty Steel) by cold drawing and machining. The storage cases 130 and 132 made of an electromagnetic stainless material are desirably subjected to a surface oxidation treatment or a coating treatment, unless necessary, depending on the type of ink.

In this embodiment, the material of the storage cases 130 and 132 is subjected to vacuum heat treatment at 950 ° C.
The surface oxidation treatment is performed by supplying a small amount of oxygen. Further, it is most desirable to apply Teflon coating with a film thickness of about 2 to 4 (μm).

The housings 130 and 132 have their flanges 130f and 132f abutted to each other via an epoxy-based adhesive, and are arc-welded (impass 60: manufactured by Matsushita Electric) to 100 (v), 60f.
(A), welded at three locations under 30 (μS) conditions.

[0159] The storage case 130 is provided at the center thereof in FIG.
There is an introduction passage 130a for introducing external ink along the direction indicated by the arrow 7. A film-like member 44 is disposed inside the storage case 130 so as to be substantially perpendicular to an extension of the introduction passage 130a.

The valve element 136, one end of which is joined to the center of the film-like member 44 by spot welding, is obtained by, for example, cold forging the above-mentioned electromagnetic stainless material (KM60 made by Tohoku Specialty Steel). The outer diameter and length of the cylindrical valve element 136 are, for example, 8 (mm). A packing 13 made of a Teflon-based rubber material is provided at the other end of the valve body 136.
8 are joined. The packing 138 is joined to the other end of the valve body 136 by vulcanization joining.

Note that the film-like member 44 may be an elastic resin film or molded rubber. However, as a material of the film-like member 44, for example, polysulfone, polypropylene,
Polyethylene, polyimide, polyamideimide, polyphenylene sulfide, Teflon and the like are preferred.

As the rubber material, fluorine rubber, hard silicon rubber and chlorinated butyl rubber are desirable, and NBR rubber and urethane rubber can also be used as the material. And polystyrene and elastomer can also be used.

When the film-like member 44 is formed of phosphor bronze, nickel, copper, or the like, it is preferable that the film-like member be plated with gold, platinum, or the like, or be coated with the above-described resin.

If dust adheres between the valve body 136 and the flat surface of the small diameter portion 132B, it may not be possible to realize the "closed" state, so that it is necessary to prevent the inflow of dust. Therefore, it is necessary to arrange a filter for removing dust and the like in the ink tank in the ink flow path. In such a case, the film member 44 can be used as a filter. That is, the number of through holes of the film-like member 44 is 4 or more and less than
m) to provide a filter function,
The film-like member 44 can also be used as a filter.

An annular coil bobbin 134 surrounding the valve element 136 with a predetermined gap 142 is provided in the large diameter portion 132A inside the housing case 132 including the large diameter portion 132A and the small diameter portion 132B. The coil bobbin 134 is formed of, for example, a polysulfone material. The above-described excitation coil 42 is arranged on the coil bobbin 134. The coil bobbin 134 is inserted into and fixed to the large diameter portion 132A via an epoxy adhesive. Note that the coil bobbin 134 was held at 115 degrees for 3 hours after insertion.

As shown by the solid line in FIG. 17, the packing 138 is in contact with the flat surface of the small diameter portion 132B of the housing case 132 when the excitation coil 42 is not excited. Therefore, the small diameter portion 13 of the storage case 132
The outlet 132b that opens on the flat surface in 2B is closed.

On the other hand, when the exciting coil 42 is excited,
As shown by a two-dot chain line in FIG. 17, when the valve body 136 and the packing 138 are pulled up by a predetermined amount,
The packing 138 is separated from the outlet 132b.

Therefore, in the valve device of the normally closed type, when the exciting coil 42 is excited, the ink flowing through the gap 142 is discharged through the discharge port 132b in the direction indicated by the arrow. For example, 1.1 (at
m), when the excitation coil 42 is excited (excitation current 25 mA, excitation voltage 10
v), the ink flow rate is, for example, about 3 ml / s. The ink flow rate depends on the ink pressure and the size and quantity of the through-holes of the film-like member 44, so that an appropriate selection is required.

It has been verified by the experiments of the present inventor that the ink does not leak to the outside and the magnetic field does not leak to the outside due to such a configuration.

FIG. 18 shows a twelfth embodiment of the valve device according to the present invention.

In the eleventh embodiment shown in FIG. 17, a valve device of a normally closed type is shown. On the other hand, in this embodiment, a valve device of a normally open type is used.

In FIG. 18, the same components as those in the example shown in FIG. 17 are denoted by the same reference numerals, and the description thereof will not be repeated.

In the example shown in FIG. 18, an annular packing 142 is provided on the periphery of the opening end of the introduction passage 130 inside the storage case 130 so as to face the center of the membrane member 44 and the valve element 136. Have been. Packing 1
Reference numeral 42 selectively contacts the central part of the membrane member 44 and the valve element 136 when the excitation coil 42 is excited, and shuts off the introduction passage 130. In addition, FIG.
The center of the membrane member 44 and the valve body 136 is the packing 14.
2 shows a state in which it is separated.

The packing 140 connected to the other end of the valve body 136 has a slit 140a for guiding the ink flowing through the gap 142 to the outside in FIG. One end side of the slit 140a having a predetermined width extends from the outer periphery of the slit 140a to the outlet 13 along the radial direction.
2b.

In such a configuration, the exciting coil 42
Is not excited, the packing 140 is in contact with the flat surface of the small diameter portion 132B of the housing case 132, and the packing 142 is connected to the membrane member 44 and the valve element 136.
Are separated from the center of the. Therefore, the introduction passage 1
The ink introduced through the gap 30a and the slit 14 is supplied during a period when the exciting coil 42 is not excited.
0a, a predetermined amount is continuously discharged through the discharge port 132b.

On the other hand, when the exciting coil 42 is excited,
The valve element 136 is raised, and the membrane member 44 and the valve element 1
The central portion of 36 is in contact with the packing 142, and the packing 140 is separated from the flat surface of the small diameter portion 132 </ b> B of the storage case 132.

Therefore, the introduction passage 130a is shut off, and a predetermined amount of ink remaining in the storage case 132 is discharged through the discharge port 132b.

In FIGS. 17 and 18, the membrane member 44 and the valve body 46 are integrated, but the invention is not limited to such an example.
May be separate as long as the position is regulated.

In the above example, the film-like member 44 is used.
Is used, but it is not always necessary to do so. For example, a coil spring may be used instead of the film-like member 44.

[0180]

As is apparent from the above description, according to the valve device of the present invention, the valve body for opening and closing the flow path and the through-hole forming a part of the flow path are connected to the valve body. The structure of the device is a simple structure including an elastic film-shaped member that is supported while being displaceable along the direction of movement of the fluid, and electromagnetic driving means that is arranged around the flow path and causes the valve body to open and close. Can be simplified and the size can be significantly reduced.

Further, since the film-like member and the valve body can be formed integrally, the number of parts can be further reduced.

Further, since the structure of the electromagnetic driving means is a paramagnetic material having a high magnetic permeability, the valve and the structure are magnetically joined in the liquid, and the valve is closed with respect to the structure. By being held, there is an advantage that leakage of liquid such as ink from the structure can be prevented.

[0183] In addition, the elastic membrane-like member may have a through hole having a diameter of 4 or more and less than 80 (μm), or a through hole having an opening area formed by a diameter of 4 or more and less than 80 (μm). By having the filter function, there is an advantage that it is not necessary to separately arrange a filter member.

[Brief description of the drawings]

1A is a plan view showing a main part of a first embodiment of a valve device according to the present invention, and FIG. 1B is a cross-sectional view corresponding to the plan view of FIG.

FIG. 2 is a sectional view showing an example of a valve device according to the present invention together with an ink tank to which the valve device is applied.

FIG. 3 is a sectional view of the valve body in the example shown in FIG.

4A is a cross-sectional view of the film-like member in the example shown in FIG. 1, and FIG. 4B is a plan view corresponding to the cross-sectional view of FIG.

FIG. 5 is an external view showing a membrane member and a valve body in the example shown in FIGS. 1 (A) and 1 (B).

6A and 6B are cross-sectional views each showing a modified example of the valve body of the example shown in FIG.

7A is a plan view showing a main part of a second embodiment of the valve device according to the present invention, FIG. 7B is a sectional view corresponding to the plan view of FIG. (C) is an external view of a valve body.

8 is a cross-sectional view of the valve main body in the example shown in FIG.

FIGS. 9A and 9B are cross-sectional views showing a main part of a third embodiment of the valve device according to the present invention.

FIG. 10 is a sectional view showing a main part of a fourth embodiment of the valve device according to the present invention.

FIG. 11 is a sectional view showing a main part of a fifth embodiment of the valve device according to the present invention.

FIGS. 12A and 12B are cross-sectional views showing a main part of a sixth embodiment of the valve device according to the present invention.

FIG. 13 is a sectional view showing a main part of a seventh embodiment of the valve device according to the present invention.

FIG. 14 is a sectional view showing a main part of an eighth embodiment of the valve device according to the present invention.

FIGS. 15A and 15B are cross-sectional views showing a main part of a ninth embodiment of the valve device according to the present invention.

FIG. 16 is a sectional view showing a main part of a tenth embodiment of the valve device according to the present invention.

FIG. 17 is a sectional view showing a main part of an eleventh embodiment of the valve device according to the present invention.

FIG. 18 is a sectional view showing a main part of a twelfth embodiment of the valve device according to the present invention.

FIG. 19 is a cross-sectional view illustrating a configuration of a conventional solenoid valve.

FIG. 20 is a sectional view showing a configuration of a conventional solenoid valve.

[Description of Signs] 40, 50, 60, 80, 90, 90 ', 96, 10
2,108 Valve body 42,62,82,88,104,114 Exciting coil 44,58,76,86,93,94,98 Membrane member 46,54,64,78,110 Valve body 48,56,66 , 84, 92, 90'b, 96'b
Discharge path

Claims (15)

[Claims] 1. A method according to claim 1, wherein the fluid is moved in a flow path,
A valve body made of a magnetic material for opening and closing the flow path, having a through-hole forming a part of the flow path, being connected to the valve body and supported so as to be displaceable along a moving direction of the fluid; A valve device comprising: an elastic film-shaped member; and electromagnetic driving means arranged around the flow path to cause the valve body to perform an opening / closing operation. 2. A method according to claim 1, wherein the fluid is moved in a flow path,
A valve body that is made of a magnetic material and has a through hole that forms a part of the flow path and that opens and closes the flow path, and that has a through hole that forms a part of the flow path and that is connected to the valve body or An elastic film-like member integrally formed with the valve body and supported so as to be displaceable along the direction of movement of the fluid; and electromagnetic driving means arranged around the flow path to open and close the valve body. A valve device comprising: 3. The valve device according to claim 1, wherein a peripheral portion of the elastic film-shaped member is supported by being caulked and fastened to one of the electromagnetic driving means. 4. The valve device according to claim 1, wherein the valve body is brought into contact with an outer peripheral portion of an opening end of the flow path to close the flow path. . 5. The valve device according to claim 1, wherein the valve body is brought into contact with an inner peripheral edge portion of an opening end of the flow path to close the flow path. . 6. The valve device according to claim 1, wherein the valve element and the elastic film-shaped member are disposed at both open ends of the flow path. 7. The valve device according to claim 1, wherein the elastic film-shaped member is formed of a metal material by press working. 8. The valve device according to claim 1, wherein the fluid is ink. 9. The valve device according to claim 1, wherein the valve body and the elastic film-shaped member are formed integrally. 10. A valve disposed in a flow path through which a fluid is moved, having a passage forming a part of the flow path, made of a magnetic material, and opening and closing the flow path; A plunger member having a through-hole forming a part of the flow path, being connected to the valve body and being movably supported, and being disposed around the flow path, A valve device comprising: an electromagnetic drive unit that causes the valve body to perform an opening and closing operation. 11. The device according to claim 1, wherein the electromagnetic driving means includes at least a structure made of a paramagnetic material having a high magnetic permeability and a winding coil. Valve device. 12. The valve device according to claim 11, wherein the structure is an injection molded article of a mixture of a paramagnetic material powder and a resin. 13. The valve device according to claim 1, wherein the magnetic material is a ferromagnetic material. 14. The valve device according to claim 1, wherein the magnetic body is a soft magnetic body. 15. The elastic membrane member has a diameter of 4 to 80.
Less than (μm), or 4 or more and less than 80 (μm)
The valve device according to any one of claims 1 to 14, further comprising a through hole having an opening area formed by the diameter of m), and having a filter function.