Solenoid valve

Abstract

To provide a solenoid valve capable of suppressing increase in the weight of the solenoid valve even when increasing the size of a valve part of the solenoid valve with the increase in the diameter of a fluid flow path, and capable of suppressing change in the magnetic characteristics of the solenoid valve.SOLUTION: A solenoid valve 1 has: a solenoid part 20 that comprises a plunger 24 provided on the outer peripheral part of a movable core part 22, the plunger biased toward an opening by a biasing member 23, excited by energizing a solenoid 21 and suctioned in a direction opposite to the biasing direction of the biasing member 23; and a valve part 30 that comprises a sealing member 31 provided at the tip part of the solenoid part 20, connected to the plunger 24 and capable of closing an opening 13, and a support part 32 supporting the sealing member 31 from a direction of the movable core part. The valve part 30 has an extension part 33 extending outward with respect to the solenoid part 20. At least a part of the support part 32 in the extension part 33 is made of resin.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a solenoid valve that controls the flow rate of a gas phase fluid or a liquid phase fluid, and more particularly to a solenoid valve that can accommodate a large fluid flow rate. [Background technology]

[0002] In recent years, with the improvement of the functions of various products and the addition of new functions, the flow rate of the fluid flowing through the products tends to increase. Therefore, the flow path through which the fluid flows is subjected to a large fluid pressure due to the increase in the fluid flow rate, and in order to suppress the large fluid pressure, it may be necessary to increase the diameter of the flow path or change the design of the flow path.

[0003] For example, due to the reduction in engine operation frequency caused by the shift to HEVs in automobiles, the flow rate of vaporized fuel supplied from the canister to the engine when negative pressure occurs in the engine tends to increase. As the flow rate of vaporized fuel increases, there are problems such as an increase in pressure pulsation in the vaporized fuel flow path connecting the canister and the engine, and an increase in vibration transmitted to the vehicle body through the support points of the flow path. In order to accommodate the increase in the flow rate of vaporized fuel, it is possible to reduce the propagating pressure pulsation by increasing the diameter of the inlet port and outlet port of the solenoid valve connected to the vaporized fuel flow path. However, as the diameter of the inlet port and outlet port of the solenoid valve increases, it is necessary to increase the size of the valve part of the solenoid valve, which causes the solenoid valve to become heavy. In addition, there is a problem that the magnetic properties of the solenoid valve change due to the increase in the size of the valve part, which requires a design change of the entire solenoid valve.

[0004] Therefore, in order to prevent an increase in pressure pulsation in the fluid flow path without increasing the size of the valve portion of the solenoid valve, it has been proposed to provide a plate-shaped member that branches the fluid within the inlet port, and to use the plate-shaped member to break down the pressure waves generated by the opening and closing of the valve body (Patent Document 1).

[0005] However, in Patent Document 1, it is necessary to provide a separate plate-like member inside the inflow port, which complicates the structure of the solenoid valve and makes the manufacture of the solenoid valve cumbersome. Also, in a structure in which a separate plate-like member is provided inside the inflow port, the inflow port still does not have a large diameter, so there is room for improvement in controlling the increasing fluid flow rate. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2012 / 176238 Summary of the Invention [Problem to be solved by the invention]

[0007] In view of the above circumstances, an object of the present invention is to provide a solenoid valve which can suppress an increase in the weight of the solenoid valve even if the size of the valve portion of the solenoid valve is increased in accordance with an increase in the diameter of the fluid flow path, and which can suppress changes in the magnetic characteristics of the solenoid valve. [Means for solving the problem]

[0008] The gist of the configuration of the present invention is as follows. [1] A solenoid unit including: a movable core portion that moves when electricity is applied to a solenoid; a biasing member that is provided on the outer periphery of the movable core portion and biased toward an opening of a flow path through which a fluid flows; and a plunger that is provided on the outer periphery of the movable core portion and biased toward the opening by the biasing member, and that is excited when electricity is applied to the solenoid and is attracted in a direction opposite to the biasing direction of the biasing member; a valve portion including a seal member provided at a tip end of the solenoid portion and connected to the plunger, the seal member being capable of closing the opening, and a support portion supporting the seal member from a direction of the movable core portion; A solenoid valve having A solenoid valve, wherein the valve portion has an extension portion that extends outward beyond the solenoid portion, and at least a portion of a support portion of the extension portion is formed from resin. [2] The solenoid valve according to [1], wherein the support portion is insert molded into the plunger. [3] The solenoid valve according to [1] or [2], wherein the support portion is made of resin. [4] The solenoid valve according to any one of [1] to [3], wherein the support portion is provided at least at a portion corresponding to an edge of the opening. [5] The solenoid valve according to any one of [1] to [4], wherein the sealing member is shaped to completely close the opening. [6] The solenoid valve according to any one of [1] to [4], wherein the sealing member is shaped to close the opening along the edge of the opening. [7] The solenoid valve according to any one of [1] to [6], wherein the support portion is shaped to support the entire surface of the extension portion of the seal member. [8] A solenoid valve according to any one of [1] to [7], wherein a through hole is provided in the support portion, and a protrusion provided on the sealing member is inserted into the through hole, so that the sealing member is connected to the support portion. [9] The solenoid valve according to any one of [1] to [8], wherein the resin forming the support portion contains glass fiber.

[10] The solenoid valve according to any one of [1] to [9], wherein the support portion is integrally molded with the seal member. Effect of the Invention

[0009] According to an aspect of the solenoid valve of the present invention, the valve portion including the seal member and the support portion supporting the seal member has an extension portion extending outward from the solenoid portion, so that as the diameter of the fluid flow path increases, the size of the valve portion of the solenoid valve can be increased while still using a conventional solenoid portion, and therefore it is possible to accommodate an increase in the diameter of the fluid flow path while still using a conventional solenoid portion. Also, according to the solenoid valve of the present invention, at least a portion of the support portion in the extension portion is made of resin, so that it is possible to suppress changes in the magnetic properties of the solenoid valve while suppressing an increase in the weight of the solenoid valve.

[0010] According to an aspect of the solenoid valve of the present invention, the support portion of the valve portion is insert molded into the plunger of the solenoid portion, thereby improving the connection stability between the extension portion of the valve portion and the solenoid portion even when a conventional solenoid portion is used.

[0011] According to an aspect of the solenoid valve of the present invention, the support portion is made of resin, so that the weight of the solenoid valve can be more reliably prevented from increasing.

[0012] According to an aspect of the solenoid valve of the present invention, the support portion is provided at least at a portion corresponding to the edge of the opening of the fluid flow path, thereby reliably improving the sealing ability of the seal member against the opening of the fluid flow path even if the diameter of the fluid flow path is increased.

[0013] According to an aspect of the solenoid valve of the present invention, the support portion is shaped to support the entire surface of the seal member, thereby further reliably improving the sealing ability of the seal member against the opening of the fluid flow path, even if the fluid flow path is made larger in diameter.

[0014] In an aspect of the solenoid valve of the present invention, the resin forming the support portion contains glass fiber, thereby improving the mechanical strength of the support portion, and further improving the sealing ability of the seal member against the enlarged diameter fluid flow path, while improving the durability of the support portion.

[0015] According to an aspect of the solenoid valve of the present invention, the support portion is integrally formed with the seal member, thereby improving the mechanical strength of the entire valve portion including the extension portion. [Brief description of the drawings]

[0016] [Figure 1] 1 is a side cross-sectional view illustrating an entire solenoid valve according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a side cross-sectional view illustrating a valve portion and a solenoid portion of the solenoid valve according to the first embodiment of the present invention. [Diagram 3] FIG. 2 is a plan view illustrating a support body of the solenoid valve according to the first embodiment of the present invention. [Figure 4] FIG. 6 is a side cross-sectional view illustrating a valve portion and a solenoid portion of a solenoid valve according to a second embodiment of the present invention. [Diagram 5] FIG. 11 is a side cross-sectional view illustrating a valve portion and a solenoid portion of a solenoid valve according to a third embodiment of the present invention. [Figure 6] FIG. 11 is a side cross-sectional view illustrating a valve portion and a solenoid portion of a solenoid valve according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, solenoid valves according to embodiments of the present invention will be described with reference to the drawings. First, a solenoid valve according to a first embodiment of the present invention will be described. FIG. 1 is a side cross-sectional view illustrating the entire solenoid valve according to the first embodiment of the present invention. FIG. 2 is a side cross-sectional view illustrating a valve portion and a solenoid portion of the solenoid valve according to the first embodiment of the present invention. FIG. 3 is a plan view illustrating a support body of the solenoid valve according to the first embodiment of the present invention.

[0018] As shown in FIG. 1, a solenoid valve 1 according to an embodiment of the present invention includes an inlet port 10 connected to an upstream pipe (not shown) through which fluid F flows and which is a fluid flow path through which the fluid F flows into the solenoid valve 1, an outlet port 11 connected to a downstream pipe (not shown) through which the fluid F flows and which is a fluid flow path through which the fluid flows out of the solenoid valve 1, an opening 13 connected to the inlet port 10 and the outlet port 11 and formed in a flow path 12 through which the fluid F flows, a solenoid section 20 including a solenoid (electromagnet) 21 and a movable core section 22 that moves when electricity is applied to the solenoid 21, and a valve section 30 provided at the tip of the solenoid section 20 and including a seal member 31 capable of closing the opening 13 of the flow path 12. Inside the solenoid valve 1, the fluid F flows from the inlet port 10 to the flow path 12, and then flows from the flow path 12 to the outlet port 11 through the opening 13 of the flow path 12, thereby causing the fluid F to flow from the piping upstream of the solenoid valve 1 to the piping downstream of the solenoid valve 1.

[0019] The seal member 31 of the valve unit 30 closes the opening 13 of the flow path 12, i.e., seals the opening 13 of the flow path 12, thereby sealing the opening 13 and stopping the flow of the fluid F from the flow path 12 to the outlet port 11. Therefore, when the seal member 31 of the valve unit 30 seals the opening 13 of the flow path 12, the flow of the fluid F from the pipe upstream of the solenoid valve 1 to the pipe downstream of the solenoid valve 1 is stopped. On the other hand, when the seal member 31 of the valve unit 30 opens the opening 13 of the flow path 12, i.e., releases the sealed state of the opening 13 of the flow path 12, the flow of the fluid F from the flow path 12 to the outlet port 11 is started. Therefore, when the seal member 31 of the valve unit 30 opens the opening 13 of the flow path 12, the fluid F flows from the pipe upstream of the solenoid valve 1 to the pipe downstream of the solenoid valve 1. As described above, the seal member 31 of the valve portion 30 repeatedly closes and opens the opening 13 of the flow path 12, thereby making it possible to control the flow rate of the fluid F flowing through the piping.

[0020] 1, the seal member 31 of the valve portion 30 opens the opening 13 of the flow path 12, so that the fluid F flows from the piping upstream of the solenoid valve 1 to the piping downstream of the solenoid valve 1. The fluid F may be a gas phase fluid or a liquid phase fluid.

[0021] As shown in FIGS. 1 and 2, the solenoid portion 20 of the solenoid valve 1 includes a movable core portion 22 that is movable by energizing the solenoid 21 from a power supply portion (not shown), a biasing member 23 that is provided on the outer periphery of the movable core portion 22 and biased toward the opening 13 of the flow passage 12 through which the fluid F flows, and a plunger 24 that is provided on the outer periphery of the movable core portion 22 and biased toward the opening 13 by the biasing member 23. The solenoid portion 20 is a portion that is excited by the solenoid 21. In the solenoid valve 1, the plunger 24 is provided on the outer periphery of the biasing member 23. Therefore, the movable core portion 22, the biasing member 23, and the plunger 24 are arranged approximately coaxially with the movable core portion 22 at the center. In the solenoid valve 1, the plunger 24 forms the outer periphery of the solenoid portion 20, and the solenoid 21 is located outside the solenoid portion 20.

[0022] When electricity is supplied to the solenoid 21 from the power supply unit, the plunger 24 of the solenoid unit 20 is excited and attracted to the solenoid 21 located in the opposite direction to the biasing direction of the biasing member 23. On the other hand, when electricity is not supplied to the solenoid 21 from the power supply unit, the plunger 24 is not excited and is biased in the biasing direction of the biasing member 23. When the plunger 24 is attracted in the opposite direction to the biasing direction of the biasing member 23, the valve unit 30 described below moves in the opposite direction to the biasing direction of the biasing member 23 as the plunger 24 is attracted, and the seal member 31 of the valve unit 30 opens the opening 13 of the flow path 12. On the other hand, when the plunger 24 is not excited and is biased in the biasing direction of the biasing member 23, the seal member 31 of the valve unit 30 abuts against the opening 13 of the flow path 12, and the seal member 31 seals the opening 13 of the flow path 12.

[0023] The biasing member 23 may be, for example, a metal spring member or a coil. The plunger 24 may be, for example, made of magnetic stainless steel. The plunger 24 may be, for example, an annular member. In the solenoid unit 20, the biasing member 23 and the movable core unit 22 are housed inside the plunger 24, which is an annular member.

[0024] As shown in Figures 1 and 2, the valve section 30 of the solenoid valve 1 is provided at the tip section 25 of the solenoid section 20 and faces the opening 13 of the flow path 12. The valve section 30 includes a seal member 31 capable of closing the opening 13 of the flow path 12, and a support section 32 that supports the seal member 31 from the direction of the movable core section 22, i.e., the direction opposite to the opening 13 of the flow path 12. In the solenoid valve 1, the seal member 31 is connected to the plunger 24 via the support section 32. As in Figure 1, Figure 2 shows a state in which the seal member 31 of the valve section 30 opens the opening 13 of the flow path 12, so that the fluid F flows from the pipe upstream of the solenoid valve 1 to the pipe downstream of the solenoid valve 1.

[0025] In the solenoid valve 1, the radial dimension of the flow path 12 is increased in response to the increase in the flow rate of the fluid F. In response to the increase in the radial dimension of the flow path 12, the valve section 30 has an extension section 33 that extends outward from the outer periphery of the solenoid section 20. As described above, the valve section 30 has a portion that overlaps with the solenoid section 20 in a plan view, that is, a central section 35 that is a portion corresponding to the solenoid section 20, and an extension section 33 that extends outward from the central section 35. The extension section 33 is a portion that does not overlap with the solenoid section 20 in a plan view. The support section 32 is provided from the central section 35 to the extension section 33. In addition, the seal member 31 is provided over the entire central section 35 and the extension section 33. Therefore, the seal member 31 is shaped to block the entire surface of the opening 13. The valve portion 30 comprises a sealing member 31 and a support portion 32 that supports the sealing member 31, and therefore the extension portion 33 comprises a sealing member 31 and a support portion 32 that supports the sealing member 31.

[0026] It should be noted that the term "planar view" refers to a state in which the valve portion 30 is viewed from a direction parallel to the direction of movement of the valve portion 30 and facing the valve portion 30.

[0027] The extension portion 33 extends along the radial direction of the flow path 12. The extension portion 33 is a flat plate-shaped portion. The extension portion 33 extends to the edge of the flow path 12 in the radial direction. The valve portion 30 has the extension portion 33, so that the opening 13 of the flow path 12, which has a large diameter, can be sealed. Therefore, the valve portion 30 has a size equal to or larger than the seal diameter required to seal the flow path 12. In the solenoid valve 1 of FIG. 2, the valve portion 30 has a size equal to the seal diameter of the flow path 12.

[0028] Since the valve portion 30 has the extension portion 33, it is possible to increase the size of the valve portion 30 of the solenoid valve 1 in accordance with the increase in the diameter of the flow path 12 of the fluid F, while still using a conventional solenoid portion 20 that does not accommodate the increase in the diameter of the flow path 12 of the fluid F. Therefore, the solenoid valve 1 can accommodate the increase in the diameter of the flow path 12 of the fluid F, while still using the conventional solenoid portion 20.

[0029] In the solenoid valve 1, as described above, the extension portion 33 is provided with the support portion 32 that supports the seal member 31 from the direction of the movable core portion 22. The support portion 32 is a plate-like member and forms a laminated structure with the seal member 31, which is also a plate-like member. The support portion 32 has a function of preventing the seal member 31 from deforming at the extension portion 33, thereby reducing the sealing ability for the opening 13.

[0030] In the extension portion 33, at least a portion of the support portion 32 is formed from resin. Since at least a portion of the support portion 32 in the extension portion 33 is formed from resin, it is possible to suppress changes in the magnetic properties of the solenoid valve 1, particularly changes in the magnetic properties of the plunger 24, while suppressing an increase in the weight of the solenoid valve 1. Since changes in the magnetic properties of the plunger 24 can be suppressed, it is possible to use the conventional solenoid portion 20.

[0031] It is sufficient that at least a portion of the support portion 32 is made of resin, and the entire support portion 32 may be made of resin. In the valve portion 30 of Fig. 2, as an example, the entire support portion 32 is made of resin. By making the support portion 32 of resin, it is possible to more reliably prevent the weight of the solenoid valve 1 from increasing.

[0032] The support portion 32 is insert molded into the plunger 24. By insert molding the support portion 32 into the plunger 24, the support portion 32 and the plunger 24 are integrated, and the valve portion 30 is fixed to the tip portion 25 of the solenoid portion 20. As a result of the support portion 32 being insert molded into the plunger 24, the connection stability between the extension portion 33 of the valve portion 30 and the solenoid portion 20 is improved even when a conventional solenoid portion 20 is used.

[0033] In the solenoid valve 1, the support portion 32 needs to be provided at least in a position corresponding to the edge 14 of the opening 13. That is, the support portion 32 needs to be provided at least in a position overlapping the edge 14 of the opening 13 in a plan view. By providing the support portion 32 in a position corresponding to the edge 14 of the opening 13, the sealing ability of the seal member 31 against the opening 13 of the flow path 12 is reliably improved even if the flow path 12 has a large diameter. Furthermore, the seal member 31 is formed with a seal surface 34 that protrudes toward the opening 13 at a position corresponding to the edge 14 of the opening 13. By forming the seal surface 34, the sealing ability of the seal member 31 against the opening 13 is reliably improved.

[0034] 2, in the valve portion 30 of the solenoid valve 1, the support portion 32 is provided over substantially the entire extension portion 33. Therefore, the support portion 32 is shaped to support substantially the entire surface of the extension portion 33 of the seal member 31. Since the support portion 32 is provided over substantially the entire extension portion 33, deformation such as bending of the extension portion 33 of the seal member 31 is more reliably prevented, so that even if the flow path 12 has a large diameter, the sealing ability of the seal member 31 with respect to the opening 13 of the flow path 12 is more reliably improved.

[0035] The method of connecting the support part 32 and the seal member 31 is not particularly limited. In the valve part 30 of the solenoid valve 1, a first through hole 41 is provided at the edge of the support part 32, and a convex part 43 provided at the edge of the seal member 31 is inserted into the first through hole 41 and engaged with the first through hole 41, thereby connecting the seal member 31 to the support part 32. The convex part 43 provided at the edge of the seal member 31 is inserted and engaged with the first through hole 41 provided at the edge of the support part 32, thereby obtaining a connection stability between the support part 32 and the seal member 31. In addition, as shown in FIG. 2, the convex part 43 is provided with a return part, so that the connection stability between the support part 32 and the seal member 31 is improved. In addition, if necessary, the seal member 31 may be baked onto the support part 32, and the support part 32 and the seal member 31 may be connected in a state in which the support part 32 and the seal member 31 are integrally molded. Since the support portion 32 is molded integrally with the seal member 31, the mechanical strength of the entire valve portion 30 including the extension portion 33 is improved.

[0036] In addition, in the valve portion 30 of the solenoid valve 1, in order for the seal member 31 to be connected to the movable core portion 22, a second through hole 42 is provided in the center of the support portion 32, and a protrusion 44 provided in the center of the seal member 31 passes through the second through hole 42. The tip of the protrusion 44 of the seal member 31 abuts against the tip of the movable core portion 22, thereby connecting the seal member 31 to the movable core portion 22. The connection of the seal member 31 to the movable core portion 22 improves the interlocking between the solenoid portion 20 and the valve portion 30.

[0037] As shown in Fig. 3, the support part 32 has a substantially circular shape in plan view in response to the substantially circular shape of the opening 13 of the flow path 12 in the radial direction. A plurality of first through holes 41 are provided at the edge of the support part 32, and a second through hole 42 (one through hole 42 in Fig. 3) is provided at the center of the support part 32. In Fig. 3, four first through holes 41 are provided at substantially equal intervals along the circumferential direction of the support part 32. Although not shown, the seal member 31 also has a substantially circular shape in plan view in response to the substantially circular shape of the opening 13 in the radial direction.

[0038] The relationship between the thickness of the support portion 32 and the thickness of the plunger 24 is not particularly limited, but for example, from the standpoint of a balance between the mechanical strength of the support portion 32 and the weight reduction of the valve portion 30, the thickness of the support portion 32 relative to the thickness of the plunger 24 is preferably 0.5 to 3.0, more preferably 0.5 to 2.0, and particularly preferably 0.7 to 1.0.

[0039] Examples of the resin used to form the support portion 32 include polyphenylene sulfide, nylon, and polybutylene terephthalate. Of these, polyphenylene sulfide is preferred from the viewpoint of heat resistance. The resin used to form the support portion 32 may contain glass fiber. When the resin used to form the support portion 32 contains glass fiber, the mechanical strength of the support portion 32 is improved, and the sealing ability of the seal member 31 with respect to the large-diameter flow passage 12 is further improved, while the durability of the support portion 32 is improved.

[0040] The amount of glass fiber blended is not particularly limited, but for example, the lower limit of the amount of glass fiber blended is preferably 10 parts by mass and more preferably 30 parts by mass relative to 100 parts by mass of resin in order to reliably improve the mechanical strength of the supporting part 32. On the other hand, the upper limit of the amount of glass fiber blended is preferably 50 parts by mass and more preferably 40 parts by mass relative to 100 parts by mass of resin in order to reliably improve the moldability of the supporting part 32.

[0041] Examples of the material for the seal member 31 include rubber members. Examples of the material types for the rubber members include fluororubber, ethylene propylene diene rubber, acrylonitrile butadiene rubber, hydrogenated acrylonitrile butadiene rubber, silicone rubber, and fluorosilicone rubber.

[0042] Next, a solenoid valve according to a second embodiment of the present invention will be described. The solenoid valve according to the second embodiment has major components in common with the solenoid valve according to the first embodiment, and therefore the same components as those in the solenoid valve according to the first embodiment will be described using the same reference numerals. Note that Fig. 4 is a side cross-sectional view illustrating a valve portion and a solenoid portion of the solenoid valve according to the second embodiment of the present invention.

[0043] In the solenoid valve 1 according to the first embodiment, a first through hole 41 is provided on the edge of the support portion 32, and a protrusion 43 provided on the edge of the sealing member 31 is inserted and fitted into the first through hole 41, thereby connecting the sealing member 31 to the support portion 32. However, instead, as shown in FIG. 4, in the solenoid valve 2 according to the second embodiment, no first through hole is provided on the edge of the support portion 32.

[0044] Therefore, in the solenoid valve 2, no protrusions are provided on the edge of the seal member 31. On the other hand, in the solenoid valve 2, a second through hole 42 is provided in the center of the support portion 32, and a protrusion 44 is provided in the center of the seal member 31. The protrusion 44 penetrates the second through hole 42, so that the seal member 31 is connected to the movable core portion 22.

[0045] In the solenoid valve 2, for example, the seal member 31 is baked onto the surface of the support portion 32, so that the support portion 32 is molded integrally with the seal member 31. The support portion 32 is molded integrally with the seal member 31, so that the seal member 31 is connected and fixed to the support portion 32. Also, in the solenoid valve 2, the support portion 32 is insert molded into the plunger 24 of the solenoid portion 20. The support portion 32 is insert molded into the plunger 24, so that the seal member 31, the support portion 32, and the plunger 24 are integrated together.

[0046] In the solenoid valve 2, even if a first through hole for connecting the sealing member 31 is not provided at the edge of the support part 32, the sealing member 31 is baked, connected and fixed to the surface of the support part 32, thereby obtaining a stable connection between the support part 32 and the sealing member 31.

[0047] Next, a solenoid valve according to a third embodiment of the present invention will be described. The solenoid valve according to the third embodiment has major components in common with the solenoid valves according to the first and second embodiments, and therefore the same components as those in the solenoid valves according to the first and second embodiments will be described using the same reference numerals. Note that Fig. 5 is a side cross-sectional view illustrating a valve portion and a solenoid portion of the solenoid valve according to the third embodiment of the present invention.

[0048] In both the solenoid valve 1 of the first embodiment and the solenoid valve 2 of the second embodiment, the sealing member 31 is provided over the entire valve portion 30, i.e., in the central portion 35 and the extension portion 33 of the valve portion 30, and the sealing member 31 is shaped to block the entire opening 13 of the flow path 12. However, instead, as shown in FIG. 5, in the solenoid valve 3 of the third embodiment, the sealing member 31 is not provided in the central portion 35 of the valve portion 30, but is provided in the extension portion 33.

[0049] From the above, in the solenoid valve 3, the seal member 31 is shaped to close the opening 13 along the edge of the opening 13 of the flow path 12. The seal member 31 is a member that is ring-shaped in a plan view. Therefore, in the central portion 35 of the valve portion 30, a surface 36 of the support portion 32 that faces the opening 13 of the flow path 12 is exposed. Note that in the solenoid valve 3 as well, the seal member 31 is formed with a seal surface 34 that protrudes toward the opening 13 at a portion that corresponds to the edge 14 of the opening 13.

[0050] In the solenoid valve 3, a first through hole 41 is provided on the edge of the support portion 32, and a plurality of protrusions 43 are provided on the seal member 31 which is ring-shaped in a plan view. The protrusions 43 of the seal member 31 are inserted into the first through hole 41 of the support portion 32, whereby the seal member 31 is connected to the support portion 32.

[0051] In the solenoid valve 3, even if the seal member 31 is not provided in the central portion 35 of the valve portion 30, the surface 36 of the support portion 32 can close the opening 13 of the flow path 12 in the central portion 35 of the valve portion 30. In addition, the seal member 31 can close the opening 13 along the edge of the opening 13 of the flow path 12. Therefore, in the solenoid valve 3, the valve portion 30 can close the opening 13 of the flow path 12. In addition, the formation of the seal surface 34 reliably improves the sealing ability of the seal member 31 against the opening 13.

[0052] Next, a solenoid valve according to a fourth embodiment of the present invention will be described. The solenoid valve according to the fourth embodiment has major components in common with the solenoid valves according to the first to third embodiments, and therefore the same components as those in the solenoid valves according to the first to third embodiments will be described using the same reference numerals. Note that Fig. 6 is a side cross-sectional view illustrating a valve portion and a solenoid portion of the solenoid valve according to the fourth embodiment of the present invention.

[0053] In the solenoid valve 1 according to the first embodiment, a first through hole 41 is provided at the edge of the support portion 32, and a convex portion 43 provided at the edge of the seal member 31 is inserted and fitted into the first through hole 41 to connect the seal member 31 to the support portion 32, and a second through hole 42 is provided at the center of the support portion 32, and a protrusion 44 provided at the center of the seal member 31 penetrates the second through hole 42 to connect the seal member 31 to the movable core portion 22. Instead of this, as shown in FIG. 6, in the solenoid valve 4 according to the fourth embodiment, the first through hole 41 is not provided at the edge of the support portion 32, and the convex portion 43 is not provided at the edge of the seal member 31. Furthermore, the second through hole 42 is not provided at the center of the support portion 32, and the protrusion 44 is not provided at the center of the seal member 31.

[0054] In the solenoid valve 4, the support portion 32 is provided over the entire central portion 35 and the extending portion 33. The seal member 31 is provided over the entire central portion 35 and the extending portion 33. The seal member 31 is placed on a surface 36 of the flat support portion 32, forming a laminated structure of the support portion 32 and the seal member 31. The method of connecting and fixing the support portion 32 and the seal member 31 is not particularly limited, and an example of the method is to bake the seal member 31 onto the support portion 32 to integrate the support portion 32 and the seal member 31.

[0055] In the solenoid valve 4, a protrusion 45 that protrudes toward the movable core portion 22 is provided on the surface of the support portion 32 facing the movable core portion 22. In the solenoid valve 4, the tip of the protrusion 45 of the support portion 32 abuts against the tip of the movable core portion 22, thereby connecting the support portion 32 to the movable core portion 22. Also, in the solenoid valve 4, the protrusion 45 and the plunger 24 are insert molded on the side surface of the protrusion 45 of the support portion 32. The protrusion 45 is insert molded with the plunger 24, so that the support portion 32 and the plunger 24 are integrated.

[0056] In the solenoid valve 4, even if the first through hole 41 and the convex portion 43 inserted into the first through hole 41, and further the second through hole 42 and the protrusion portion 44 inserted into the second through hole 42 are not provided, the sealing member 31 is baked onto the surface of the support portion 32, thereby connecting and fixing the same, and thus a stable connection between the support portion 32 and the sealing member 31 is obtained.

[0057] Next, other embodiments of the solenoid valve of the present invention will be described. In each of the above-mentioned embodiments, the seal member 31 is formed with the seal surface 34 protruding toward the opening 13 at a portion corresponding to the edge 14 of the opening 13, but instead, the seal surface 34 may not be formed. That is, the surface of the seal member 31 facing the opening 13 may be a flat surface. Also, in each of the above-mentioned embodiments, the support portion 32 is shaped to support substantially the entire surface of the extension portion 33 of the seal member 31, but instead, the support portion 32 may be shaped to support a partial region of the extension portion 33 of the seal member 31.

[0058] In addition, in each of the above embodiments, the entire support portion 32 is made of resin, but instead, a part of the support portion 32 may be made of resin and the other part may be made of metal. [Industrial Applicability]

[0059] The solenoid valve of the present invention can suppress an increase in the weight of the solenoid valve even if the size of the valve portion of the solenoid valve is increased as the diameter of the fluid flow path is increased, and can also suppress changes in the magnetic properties of the solenoid valve, making it usable in a wide range of fields. For example, it can be installed in a fluid flow path of vaporized fuel connecting a canister and engine mounted on an automobile to control the flow rate of vaporized fuel. [Explanation of symbols]

[0060] 1, 2, 3, 4 Solenoid valve 20 Solenoid section 22 Movable core part 23 Pressing member 24 Plunger 30 Valve section 31 Sealing material 32 Support part 33 Extension part

Claims

1. a solenoid section including: a movable core section that moves when a current is passed through a solenoid; a biasing member that is provided on the outer periphery of the movable core section and biased toward an opening of a flow path through which a fluid flows; and a plunger that is biased toward the opening by the biasing member, is excited when a current is passed through the solenoid and is attracted in a direction opposite to the biasing direction of the biasing member, and is provided on the outer periphery of the movable core section; a valve portion including a seal member provided at a tip end of the solenoid portion and connected to the plunger, the seal member being capable of closing the opening, and a support portion supporting the seal member from a direction of the movable core portion; A solenoid valve having A solenoid valve, wherein the valve portion has an extension portion that extends outward beyond the solenoid portion, and at least a portion of a support portion of the extension portion is formed from resin.

2. 2. The solenoid valve according to claim 1, wherein the support portion is insert molded into the plunger.

3. 3. The solenoid valve according to claim 1, wherein the support portion is made of resin.

4. 4. The solenoid valve according to claim 1, wherein the support portion is provided at least at a portion corresponding to an edge of the opening portion.

5. 5. The solenoid valve according to claim 1, wherein the seal member is shaped to completely close the opening.

6. 5. The solenoid valve according to claim 1, wherein the seal member is shaped to close the opening along an edge of the opening.

7. 7. The solenoid valve according to claim 1, wherein the support portion is shaped to support an entire surface of the extension portion of the seal member.

8. 8. The solenoid valve according to claim 1, wherein a through hole is provided in the support portion, and a protrusion provided on the seal member is inserted into the through hole to connect the seal member to the support portion.

9. 9. The solenoid valve according to claim 1, wherein the resin forming the support portion contains glass fiber.

10. 10. The solenoid valve according to claim 1, wherein the support portion is integrally formed with the seal member.

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