JP2011158025A - Solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid valve which operates, upon the action of magnetic force thereon, so as to narrow a valve hole of an extension magnetic valve element. <P>SOLUTION: The solenoid valve 10 includes: the extension magnetic valve element 30 including the valve hole 30A formed through a viscoelastic body 31 containing a magnetic powder and granular material 32, the valve element being provided in the middle of a flow passage 10A of a valve body 19; and an electromagnet 20 which gives magnetic force to the valve element 30. When the magnetic force acts on the valve element 30, the valve element 30 is pressed onto a barrier wall 18 and deformed to narrow the valve hole 30A. The valve opening of the valve hole 30A is reduced according to increase in DC current, and the valve hole 30A can be perfectly closed. When the magnetic force acting on the valve element 30 is eliminated, the valve element 30 is returned to the original shape, and the valve hole 30A is thus extended to the original size. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is provided with a telescopic magnetic valve body formed by penetrating a valve hole in a viscoelastic body containing magnetic powder particles in the middle of the flow path, and the valve opening degree of the valve hole can be changed by the magnetic force of the electromagnet. It relates to an electromagnetic valve.

  As a conventional electromagnetic valve of this type, there is known one that operates so that the valve hole expands when the telescopic magnetic valve element is elastically deformed by a magnetic force (see Patent Document 1).

JP 2007-287815 (paragraph [0074], FIG. 4)

  On the other hand, there has been a demand for the development of a new electromagnetic valve that operates in a manner opposite to the above-described conventional electromagnetic valve, that is, operates so that the valve hole is throttled when the telescopic magnetic valve body is elastically deformed by a magnetic force. .

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electromagnetic valve that operates so that the valve hole of the telescopic magnetic valve element is throttled when a magnetic force acts.

  The electromagnetic valve (10) according to the invention of claim 1 made to achieve the above object has a valve hole (30A) penetrating through a viscoelastic body (31) containing a magnetic granular material (32). The expansion / contraction magnetic valve body (30) is provided in the middle of the flow path (10A) formed in the valve body (19) so that the fluid passes through the valve hole (30A) and flows in the flow path (10A). In the electromagnetic valve (10) configured to change the valve opening degree of the valve hole (30A) by elastically deforming the telescopic magnetic valve body (30) by the magnetic force of the electromagnet (20), the valve body (19) The valve body end surface abutting portion (18) that abuts one end surface of the telescopic magnetic valve body (30) and the side surface of the telescopic magnetic valve body (30) are in close contact with the fluid on the side surface of the telescopic magnetic valve body (30). Side surface of the valve body that prevents passage and restricts deformation of the telescopic magnetic valve body (30) to the side The contact hole (11) is formed, and the valve hole (30A) is narrowed by pressing the deformable magnetic valve element (30) against the valve element end surface contact part (18) by the magnetic force of the electromagnet (20). It has the characteristic in the place comprised in this way.

  According to a second aspect of the present invention, in the electromagnetic valve (10) according to the first aspect, the flow rate of the fluid passing through the valve hole (30A) is controlled by controlling the magnitude of the direct current flowing through the electromagnet (20). It is characterized in that it can be changed.

  The invention of claim 3 is the electromagnetic valve (10) according to claim 1 or 2, wherein the electromagnet (20) is provided with an iron core (22) inside the solenoid (21), and the shaft of the iron core (22). A central hole (22A) is formed through the core, the central hole (22A) forms part of the flow path (10A), and the valve element end surface abutting portion (18) is formed on one end surface of the iron core (22). It is characterized in that it is disposed and brought into contact with one end face of the telescopic magnetic valve body (30).

  According to a fourth aspect of the present invention, in the electromagnetic valve (10) according to the third aspect, a support pipe (11) made of a magnetic material is arranged inside the solenoid (21), and the support pipe (11) A telescopic magnetic valve element (30) is fitted from one end of the support pipe to a position closer to one end, and an iron core (22) is fitted from the position closer to one end to the other end in the support pipe (11), and the solenoid (21 A yoke (12) having an outer tube portion (15) fitted on the outside of the outer surface and a pair of end surface plate portions (16, 17) addressed to both end surfaces of the solenoid (21), One end plate portion (16) is connected to the end of the iron core (22) opposite to the telescopic magnetic valve body (30), while the telescopic magnetic valve body (30) of the support pipe (11) is connected to the end plate portion (16). One end of the solenoid (21) is connected to the inner end (11B). By al protrude, having characterized in that the other end face plate portion (17) is connected to the protruding portion.

[Invention of Claim 1]
According to the invention of claim 1, when the magnetic force is not acting, the telescopic magnetic valve body (30) retains its original shape. At this time, the valve opening of the valve hole (30A) is fully open, and the fluid flows through the valve hole (30A) through the flow path (10A). On the other hand, when a magnetic force acts on the expansion / contraction magnetic valve element (30), the expansion / contraction magnetic valve element (30) is pressed against the valve element end surface contact portion flow path (18) to be deformed. At this time, since the deformation of the telescopic magnetic valve body (30) to the side is restricted by the valve body side surface contact portion (11), the viscoelastic body (31) constituting the telescopic magnetic valve body (30) is the valve. The valve hole (30A) is squeezed into the hole (30A). When the magnetic force acting on the expansion / contraction magnetic valve element (30) is lost, the expansion / contraction magnetic valve element (30) returns to its original shape and the valve hole (30A) expands to its original size.

[Invention of claim 2]
According to the second aspect of the present invention, it is possible to adjust the size of the valve hole (30A) by controlling the direct current flowing through the electromagnet (20) and arbitrarily change the flow rate of the fluid.

[Invention of claim 3]
According to the invention of claim 3, by energizing the solenoid (21), the telescopic magnetic valve body (30) arranged coaxially with the iron core (22) is attracted to the iron core (22), and the valve body end surface abuts. Deformed by being pressed against the part (18). Since the iron core (22) is provided inside the solenoid (21), the magnetic flux density inside the solenoid (21) is improved as compared with the case where the iron core (22) is not provided. Thereby, the electric current required for deform | transforming an expansion-contraction magnetic valve body (30) and restrict | squeezing a valve hole (30A) can be suppressed, or the weight reduction of a solenoid (21) can be achieved. In other words, the magnetic force acting on the telescopic magnetic valve body (30) can be enhanced without increasing the power consumption and the weight of the solenoid (21).

[Invention of claim 4]
According to the invention of claim 4, since the loop-shaped magnetic path is constituted by the iron core (22), the support pipe (11), the telescopic magnetic valve element (30) and the yoke (12), the yoke (12) is provided. The magnetic resistance of the magnetic circuit is reduced compared to the case without it. Thereby, the electric current required for deforming the expansion / contraction magnetic valve body (30) to restrict the valve hole (30A) can be further suppressed, and the weight of the solenoid (21) can be further reduced.

1 is a side sectional view of an electromagnetic valve according to an embodiment of the present invention. (A) Side sectional view of the telescopic magnetic valve body when no power is supplied, (B) Side sectional view of the telescopic magnetic valve body with the valve hole being throttled, (C) Telescopic magnetic valve body with the valve hole closed Side sectional view of (A) sectional side view of electromagnetic valve according to modification, (B) bottom view of yoke Side sectional view of electromagnetic valve according to modification Side sectional view of electromagnetic valve according to modification

  Hereinafter, an embodiment of an electromagnetic valve 10 according to the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the electromagnetic valve 10 includes a valve body 19 having a flow path 10A therein. Connection parts 19A and 19A for connecting to fluid piping are provided at both ends of the flow path 10A in the valve body 19.

  A support pipe 11, an electromagnet 20, and a telescopic magnetic valve body 30 are accommodated inside the valve body 19. The support pipe 11 is made of a magnetic material and has a cylindrical shape extending coaxially with the flow path 10A.

  The electromagnet 20 is provided with an iron core 22 inside a solenoid 21. The solenoid 21 is configured by winding an insulating wire around a cylindrical bobbin 23 made of an insulating material. The bobbin 23 is fitted to the outside of the support pipe 11, and the whole of the support pipe 11 except for the upstream end portion 11 </ b> B is surrounded by the solenoid 21. Although not shown, a direct current power source is connected to the solenoid 21 via a variable resistor.

  The iron core 22 is fitted in close contact with the inner surface of the support pipe 11. Specifically, the iron core 22 extends from the downstream end 11A of the support pipe 11 to a position closer to the upstream end 11B. A central hole 22A constituting a part of the flow path 10A is formed in the axial center of the iron core 22. The cross section of the center hole 22A is circular, and the inner diameter is constant in the axial direction. The material of the iron core 22 is not limited to iron.

  The solenoid 21 is surrounded by a cylindrical yoke 12. The yoke 12 includes a cylindrical outer tube portion 15 fitted to the outside of the solenoid 21 and a pair of end surface plate portions 16 and 17 addressed to both end surfaces of the solenoid 21. The pair of end face plate portions 16, 17 protrudes radially inward from both end portions of the outer cylinder portion 15.

  The downstream end face plate portion 16 is connected to the end of the iron core 22 opposite to the telescopic magnetic valve body 30. On the other hand, the upstream end plate portion 17 is connected to the upstream end portion 11 </ b> B of the support pipe 11 protruding from the solenoid 21. Here, in the yoke 12, the downstream end surface plate portion 16 is integrally formed with the outer cylinder portion 15 and the iron core 22, and the upstream end surface plate portion 17 has the solenoid 21 inside the outer cylinder portion 15. After being fitted, it is welded to the end of the outer cylinder part 15.

  A partition wall 18 is in contact with the front end surface of the iron core 22. The partition wall 18 has a disk shape projecting from the inner peripheral surface of the support pipe 11 toward the center. The partition wall 18 is made of a non-magnetic material (for example, resin), and is formed integrally with the support pipe 11 or a separate part from the support pipe 11. A communication hole 18 </ b> A having substantially the same diameter as the center hole 22 </ b> A is formed through the center of the partition wall 18. Moreover, the opening edge by the side of the expansion-and-contraction magnetic valve body 30 mentioned below among 18 A of communication holes is R chamfering shape. The partition wall 18 corresponds to the “valve element end surface contact portion” of the present invention.

  A cylindrical valve body receiving space is formed on the upstream end portion 11B side of the support pipe 11, that is, on the opposite side of the partition wall 18 from the iron core 22, and the telescopic magnetic valve body 30 is fitted therein. . The telescopic magnetic valve body 30 is obtained by uniformly dispersing and fixing a magnetic granular material 32 (for example, carbonyl iron or ferrite) in a viscoelastic body 31 (for example, silicone rubber or silicone gel). Specifically, the liquid viscoelastic body 31 and the magnetic granular material 32 are uniformly stirred while degassing under a predetermined ratio, and the mixture is filled in a mold and heat-cured. Is. The viscoelastic body 31 is not limited to silicone rubber or silicone gel, and the magnetic powder body 32 is not limited to carbonyl iron or ferrite.

  The original shape of the telescopic magnetic valve body 30 has a cylindrical structure corresponding to the valve body receiving space, and its outer peripheral surface is in close contact with the inner peripheral surface of the support pipe 11 so that fluid can pass through the side surface of the telescopic magnetic valve body 30. Is preventing. Further, one end surface in the axial direction of the telescopic magnetic valve body 30 is in close contact with the partition wall 18. The support pipe 11 (specifically, the upstream end portion 11B fitted with the telescopic magnetic valve body 30) corresponds to the “valve body side surface contact portion” of the present invention.

  Here, in order to prevent the expansion / contraction magnetic valve body 30 from falling off or being displaced, the outer peripheral surface of the expansion / contraction magnetic valve body 30 may be fixed to the inner peripheral surface of the support pipe 11 with an adhesive, or the expansion / contraction magnetic valve body. 30 end faces may be fixed to the partition wall 18 by an adhesive.

  A valve hole 30 </ b> A through which fluid can pass is formed through the shaft center of the telescopic magnetic valve body 30. When the telescopic magnetic valve body 30 is the original shape, the cross section of the valve hole 30A is circular, and the inner diameter is constant in the axial direction of the telescopic magnetic valve body 30 and smaller than the center hole 22A and the communication hole 18A.

  The telescopic magnetic valve body 30 is elastically deformed as described below when the magnetic force of the electromagnet 20 acts. The above is the description regarding the configuration of the electromagnetic valve 10.

  Next, the operation of the electromagnetic valve 10 will be described. When the solenoid 21 is not energized, no magnetic force acts on the expansion / contraction magnetic valve body 30, so the expansion / contraction magnetic valve body 30 retains its original shape. At this time, the valve hole 30A of the telescopic magnetic valve body 30 is fully opened as shown in FIG.

  When the solenoid 21 is energized, a magnetic flux penetrating the support pipe 11 in the axial direction is generated. At this time, the iron core 22, the support pipe 11, the telescopic magnetic valve body 30 and the yoke 12 constitute a loop-shaped magnetic path, and the magnetic flux extends in the axial direction of the iron core 22 and penetrates the support pipe 11, and the telescopic magnetic valve body. 30, the support pipe 11, the upstream end plate portion 17, the outer cylinder portion 15, and the downstream end plate portion 16 are returned to the iron core 22.

  At this time, a magnetic force that draws the telescopic magnetic valve body 30 toward the iron core 22 is generated, and the telescopic magnetic valve body 30 is pressed against the partition wall 18 and elastically deformed. Specifically, the deformation of the telescopic magnetic valve body 30 toward the outside in the radial direction is restricted by the support pipe 11, so as shown in FIG. 2 (B), it approaches the inside of the valve hole 30 </ b> A as it approaches the partition wall 18. The downstream end of the valve hole 30A is squeezed by being elastically deformed so as to come out.

  Here, since the opening edge of the communication hole 18A on the side of the expansion / contraction magnetic valve body 30 has an R chamfered shape, the opening edge of the communication hole 18A bites into the expansion / contraction magnetic valve body 30 pressed against the partition wall 18. As a result, the expansion / contraction magnetic valve element 30 can be prevented from being damaged.

  The inner diameter (hereinafter referred to as “valve opening”) of the contracted portion (downstream end) of the valve hole 30 </ b> A can be changed by the magnitude of the direct current flowing through the solenoid 21. That is, the valve opening degree of the valve hole 30A can be increased by reducing the direct current, while the valve opening degree of the valve hole 30A can be reduced by increasing the direct current. When the direct current is increased to a predetermined value or more, the downstream end of the valve hole 30A is closed as shown in FIG. That is, the flow rate can be controlled by the telescopic magnetic valve body 30, and the flow of fluid can be blocked. When the energization of the solenoid 21 is stopped and the magnetic force does not act on the expansion / contraction magnetic valve body 30, the expansion / contraction magnetic valve body 30 returns to its original shape due to the elastic force of the viscoelastic body 31, and the valve hole 30A returns to the fully opened state. (See FIG. 2A).

  Thus, according to this embodiment, when the magnetic force is not acting, the expansion-contraction magnetic valve body 30 retains its original shape, and the valve hole 30A is fully opened. On the other hand, when a magnetic force acts on the expansion / contraction magnetic valve body 30, the expansion / contraction magnetic valve body 30 is pressed against the partition wall 18 and deformed, and the valve hole 30A is throttled. As the direct current increases, the valve opening of the valve hole 30A decreases, and the valve hole 30A can be completely closed. And if the magnetic force which acts on the expansion-contraction magnetic valve body 30 is lose | eliminated, the expansion-contraction magnetic valve body 30 will return to an original form, and the valve hole 30A will expand to the original magnitude | size.

  Further, the valve opening degree of the valve hole 30A can be controlled by controlling the magnitude of the direct current flowing through the solenoid 21, and the flow rate and fluid pressure of the fluid passing through the valve hole 30A can be arbitrarily changed. . Furthermore, since the iron core 22 is inserted in the center of the solenoid 21, the magnetic flux density in the support pipe 11 is improved as compared with the case where the iron core 22 is not provided. Thereby, it is possible to suppress the direct current required to deform the telescopic magnetic valve body 30 and restrict the valve hole 30A, and to reduce the weight of the solenoid 21. In other words, the magnetic force acting on the telescopic magnetic valve body 30 can be enhanced without increasing the power consumption and the weight of the solenoid 21.

  If the direct current flowing through the solenoid 21 is suppressed, the heat generation of the solenoid 21 is reduced, and the forced cooling means for the solenoid 21 can be omitted. Further, if the magnetic force can be strengthened, it becomes possible to use the viscoelastic body 31 with higher (hard) viscoelasticity for the telescopic magnetic valve body 30, and the degree of freedom in selecting the viscoelastic body 31 is increased. In addition, the pressure resistance can be improved by using the viscoelastic body 31 having high viscoelasticity for the telescopic magnetic valve body 30.

  Further, since the iron core 22, the support pipe 11, the yoke 12, and the telescopic magnetic valve element 30 form a loop-shaped magnetic path, the magnetic resistance of the magnetic circuit can be reduced. Thereby, it is possible to further suppress the direct current required for deforming the expansion / contraction magnetic valve body 30 and restricting the valve hole 30A, or to further reduce the weight of the solenoid 21.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the above embodiment, the iron core 22 is fitted in close contact with the inner surface of the support pipe 11, and fluid can pass through the center hole 22A penetrating the iron core 22, but FIG. As shown in FIG. 5, the iron core 22 is formed into a thin shaft shape that is loosely fitted into the support pipe 11 so that the fluid passes through the gap between the inner peripheral surface of the support pipe 11 and the outer surface of the iron core 22, As shown in FIG. 5B, a fluid passage hole 13 through which fluid can pass may be formed through the end face plate portion 16.

  (2) In the above embodiment, the partition wall 18 as the “valve element end surface contact portion” is provided between the tip of the core 22 and the telescopic magnetic valve body 30. You may make it the structure which made the front-end | tip contact | abut the expansion-contraction magnetic valve body 30. FIG. In this case, the tip of the iron core 22 corresponds to the “valve element end surface contact portion” of the present invention.

  (3) In the above embodiment, the tip of the iron core 22 butted against the telescopic magnetic valve body 30 is immersed inside the solenoid 21. For example, as shown in FIG. The telescopic magnetic valve body 30 may be arranged so as to protrude from both end faces of the 21 and overlap one end protruding from the solenoid 21.

  (4) As shown in FIG. 5, a flow path 10A bent in an L shape is formed in the valve main body 19, and the expansion / contraction magnetic valve element 30 is disposed in the middle of one straight portion of the L shape, and the partition wall The electromagnet 20 is disposed on the opposite side of the expansion and contraction magnetic valve body 30 across the bent portion of the flow path 10A and the expansion and contraction magnetic valve body 30 is attracted to the electromagnet 20 side by a magnetic force and is pressed and deformed against the partition wall 18 side. Thus, the valve hole 30A may be configured to be throttled.

  (5) In the said embodiment, although the iron core 22 was provided, the iron core 22 does not need to be provided.

  (6) Although the yoke 12 is provided in the embodiment, the yoke 12 may not be provided.

  (7) In the above embodiment, each of the valve hole 30A, the communication hole 18A, and the center hole 22A is one, but the iron core 22 is provided with a plurality of through holes extending along the axial direction, A plurality of valve holes 30A and a plurality of communication holes 18A may be provided corresponding to each of the through holes.

  (8) In the above embodiment, the case where the electromagnetic valve 10 is connected to the fluid pipe so that the telescopic magnetic valve body 30 is disposed on the upstream side is illustrated, but the telescopic magnetic valve body 30 is disposed on the downstream side. The electromagnetic valve 10 may be connected to the fluid piping. However, it is arranged so that the direction in which the telescopic magnetic valve body 30 is attracted by magnetic force and the direction of the flow of the fluid flowing into the valve hole 30A coincide, that is, as in the above-described embodiment, the telescopic magnetic valve body 30 is It is preferable to arrange so as to be on the upstream side.

  (9) In the above embodiment, the opening edge of the communication hole 18A on the side of the telescopic magnetic valve body 30 has an R chamfered shape, but the opening edge to the telescopic magnetic valve body 30 can also be formed in a tapered chamfered shape. It is possible to prevent biting in.

10 Solenoid valve 10A Flow path 11 Support pipe (valve element side surface contact part)
12 Yoke 15 Outer cylinder part 16, 17 End face plate part 18 Bulkhead (valve element end face contact part)
DESCRIPTION OF SYMBOLS 19 Valve main body 20 Electromagnet 21 Solenoid 22 Iron core 22A Center hole 30 Telescopic magnetic valve body 30A Valve hole 31 Viscoelastic body 32 Magnetic granular material

Claims (4)

A flow path (10A) in which a telescopic magnetic valve body (30) formed by penetrating a valve hole (30A) in a viscoelastic body (31) containing a magnetic granular material (32) is formed in a valve body (19). The fluid is configured so that the fluid passes through the valve hole (30A) and flows in the flow path (10A), and the elastic magnetic valve body (30) is elastically deformed by the magnetic force of the electromagnet (20). In the electromagnetic valve (10) in which the valve opening degree of the valve hole (30A) can be changed,
The valve body (19) is in close contact with the side surface of the expansion / contraction magnetic valve body (30) and the valve body end surface contact portion (18) that is in contact with one end surface of the expansion / contraction magnetic valve body (30). Forming a valve body side surface contact portion (11) that prevents the fluid from passing through the side surface of the magnetic valve body (30) and restricts deformation of the telescopic magnetic valve body (30) to the side;
The valve hole (30A) is configured to be squeezed by pressing the deformable magnetic valve element (30) against the valve element end surface abutting portion (18) by the magnetic force of the electromagnet (20). Characteristic electromagnetic valve (10).   2. The electromagnetic valve according to claim 1, wherein the flow rate of the fluid passing through the valve hole (30 </ b> A) can be arbitrarily changed by controlling the magnitude of a direct current supplied to the electromagnet (20). (10). The electromagnet (20) is provided with an iron core (22) inside a solenoid (21),
A central hole (22A) is formed through the axial center of the iron core (22), and the central hole (22A) forms a part of the flow path (10A), and the one end surface of the iron core (22) The electromagnetic valve (10) according to claim 1 or 2, wherein a valve body end surface abutting portion (18) is arranged to abut one end surface of the telescopic magnetic valve body (30). A support pipe (11) made of a magnetic material is disposed inside the solenoid (21), and the telescopic magnetic valve body (30) is fitted from one end to the other end of the support pipe (11). And fitting the iron core (22) from the position closer to one end to the other end in the support pipe (11),
A yoke (15) having an outer tube portion (15) fitted to the outside of the solenoid (21) and a pair of end surface plate portions (16, 17) addressed to both end surfaces of the solenoid (21). 12)
One end face plate portion (16) is connected to an end portion of the iron core (22) opposite to the telescopic magnetic valve body (30), while the telescopic magnetic valve of the support pipe (11). One end (11B) with the body (30) fitted inside is protruded from one end face of the solenoid (21), and the other end face plate (17) is connected to the protruding portion. The electromagnetic valve (10) according to claim 3.

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