Valve device

Abstract

The invention provides a valve device, even if a shaft is slightly deviated or obliquely moved, a valve core can be tightly connected with a valve seat, so that the valve can be reliably closed. A valve device is provided with: a housing (10) that defines an upstream passage (12a) and downstream passages (13a, 14a) through which a fluid passes, and that separates valve seats (11d, 11e) that are present between the upstream passage and the downstream passage; a shaft (60) that reciprocates along a predetermined axis (S); in the valve device, the valve seat (11d, 11e) is formed as an annular tapered surface that is a part of a conical surface centered on the axis, and the valve body (20, 30) is formed so as to include a convex curved surface (22a, 32a) that comes into contact with the annular tapered surface when the valve body (20, 30) is seated on and detached from the valve seat (11d, 11e).

Description

Technical Field

[0001] The present invention relates to a valve device including a valve core that is seated on a valve seat to close a valve, and more particularly to a valve device including a valve core that is fixed to a shaft that reciprocates linearly. Background Art

[0002] As an existing valve device, there is known a check valve, which includes: a shell (bent tube, valve housing) having an inlet path, an outlet path, and a planar valve seat interposed between the inlet path and the outlet path; a valve core integrally formed on a valve shaft that reciprocates in the shell; a flat gasket member adhered to the valve core in order to contact the valve seat when the valve is closed; and a spring body that applies force to the valve core in the direction of closing the valve (for example, refer to patent document 1).

[0003] In the check valve, the packing member is formed as a flat surface, and the valve seat is formed as a flat surface. Therefore, if the valve shaft is slightly tilted, the packing member will not be in close contact with the valve seat and the valve cannot be closed reliably.

[0004] As another valve device, there is known an electromagnetic control valve, which includes: a shell having an air inlet, an exhaust port, and a valve seat interposed between the air inlet and the exhaust port; a shaft that reciprocates within the shell; a valve member and a rubber member that are fixed to the end of the shaft; a compression spring that applies force to the valve member in the valve closing direction; and a solenoid that includes a movable iron core fixed to the shaft, a fixed iron core, and an electromagnetic coil (for example, refer to patent document 2).

[0005] In the electromagnetic control valve, the valve seat is formed as a flat surface perpendicular to the reciprocating direction of the shaft, and the rubber member is formed to include a flat surface facing the valve seat and an annular protrusion protruding from the flat surface. However, the top of the annular protrusion is substantially located on the flat surface, so if the shaft is slightly tilted, the rubber member will not be in close contact with the valve seat and the valve cannot be closed reliably.

[0006] [Prior art literature]

[0007] [Patent Document]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 2016-75357

[0009] [Patent Document 2] Japanese Patent Application Laid-Open No. 62-56679 Summary of the invention

[0010] [Problems to be solved by the invention]

[0011] The present invention has been made in view of the above circumstances, and an object thereof is to provide a valve device in which a valve element can be in close contact with a valve seat and the valve can be securely closed even if the axis is slightly deviated or moves in an inclined manner.

[0012] [Technical means to solve the problem]

[0013] The valve device of the present invention has the following structure, which includes: a shell, which defines an upstream passage and a downstream passage for fluid to pass through, and a valve seat that is interposed between the upstream passage and the downstream passage; a shaft, which reciprocates along a specified axis; and a valve core, which is fixed to the shaft and is seated and disengaged relative to the valve seat, wherein the valve seat is formed as an annular conical surface that is a part of a conical surface centered on the axis, and the valve core is formed as a convex curved surface that contacts the annular conical surface when seated relative to the valve seat.

[0014] In the valve device, a configuration may be adopted in which the convex curved surface is formed to include a part of a spherical surface having a center on the axis.

[0015] In the valve device, the following structure can also be adopted, that is, the valve seat is defined by a circular inner edge and a circular outer edge centered on the axis, the valve core includes an outer peripheral edge with an outer diameter less than the diameter of the circular outer edge, and the convex curved surface is formed over a specified range from the outer peripheral edge toward the radial inside.

[0016] In the valve device, a structure may be adopted in which the valve element includes a valve base material fixed to the shaft and an elastic sealing member fixed to the valve base material, and the convex curved surface is formed on the elastic sealing member.

[0017] The valve device may have a structure in which the valve base includes a projection fixed to the shaft and an annular plate extending from the outer periphery of the projection in a radial direction perpendicular to the axis, and the elastic sealing member is joined to cover the annular plate.

[0018] In the valve device, a structure may be adopted in which the elastic sealing member and the projection portion are formed to have the same thickness dimension in the axial direction.

[0019] In the valve device, a structure in which the valve base material includes a concave-convex surface on a bonding interface with the elastic sealing member may be adopted.

[0020] In the above-mentioned valve device, a structure in which the elastic sealing member is molded with respect to the valve base material may be adopted.

[0021] The valve device may have a structure in which the valve element is rotationally symmetrical about the axis and is formed in plane symmetry with respect to a plane perpendicular to the axis.

[0022] In the valve device, the following structure may also be adopted, namely, the downstream side passage includes a first downstream side passage and a second downstream side passage branching from the upstream side passage, the valve seat includes a first valve seat facing the first downstream side passage and a second valve seat facing the second downstream side passage, and the valve core includes a first valve core corresponding to the first valve seat and a second valve core corresponding to the second valve seat, which are arranged isolated from each other in the axial direction.

[0023] In the valve device, the following structure can also be adopted, that is, the first valve core is in an open valve state detached from the first valve seat when the second valve core is in a closed valve state, and the second valve core is in an open valve state detached from the second valve seat when the first valve core is in a closed valve state.

[0024] The valve device may also have a structure further including a driving unit for driving the shaft.

[0025] In the valve device, the following structure may be adopted, that is, the drive unit includes a mover to which a shaft is fixed, an exciting coil, and a stator forming a magnetic circuit, and the shaft is formed of a non-magnetic material.

[0026] In the valve device, a structure in which the valve base is formed of a non-magnetic material and the elastic sealing member is formed of a rubber material may be adopted.

[0027] In the valve device, the following structure can also be adopted, that is, the first valve core and the second valve core are fixed to the shaft by interlocking, and the shell includes: a shell body, including a joint surface for engaging the drive unit, a first opening portion formed on the inner side of the joint surface so that the first valve core can be inserted from one side of the axial direction, a first valve seat and a second valve seat continuous with the first opening portion and arranged in sequence along the axial direction, and a second opening portion formed so that the second valve core can be inserted from the other side of the axial direction; and a shell cover, which is combined with the shell body to close the second opening portion.

[0028] In the valve device, a structure in which the shaft includes a positioning portion for positioning the second valve element in the axial direction may be adopted.

[0029] [Effects of the Invention]

[0030] According to the valve device having the above structure, even if the shaft slightly deviates from the axis or moves in an inclined manner, the valve element can be in close contact with the valve seat and the valve can be securely closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is an external perspective view of the valve device according to one embodiment of the present invention as viewed from the drive unit side.

[0032] Figure 2 This is a perspective view of the appearance of the valve device according to one embodiment as viewed from the side opposite to the drive unit.

[0033] Figure 3 This is a cross-sectional view of a valve device according to one embodiment cut along a plane passing through the axis.

[0034] Figure 4 This is an exploded perspective view of a drive unit that is a part of a valve device according to an embodiment, exploded along an axis.

[0035] Figure 5 This is a cross-sectional view of a drive unit that is a part of a valve device according to one embodiment, cut along a plane including the axis.

[0036] Figure 6 This is a perspective view showing the appearance of a housing which is a part of a valve device according to an embodiment.

[0037] Figure 7 is an exploded cross-sectional view of a housing that is a portion of a valve device according to one embodiment.

[0038] Figure 8 It is a perspective cross-sectional view showing a region of a first valve seat of a housing in a valve device according to an embodiment.

[0039] Fig. 9 It is a perspective cross-sectional view showing a region of a second valve seat of a housing in a valve device according to an embodiment.

[0040] Fig.10 This is a partial view showing valve elements (first valve element and second valve element) fixed to a shaft in a valve device according to an embodiment.

[0041] Fig.11 It is a perspective cross-sectional view showing valve elements (first valve element, second valve element) included in the valve device according to one embodiment.

[0042] Fig.12 This is a partial cross-sectional view of a valve element (a first valve element, a second valve element) included in a valve device according to an embodiment.

[0043] Fig.13 Schematic diagram showing the relationship between a first valve body and a shaft and a first valve seat included in a valve device according to an embodiment.

[0044] Fig.14 Schematic diagram showing the relationship between a second valve body and a shaft and a second valve seat included in the valve device according to one embodiment.

[0045] Fig.15 This is a cross-sectional view showing the open and closed states of the valve bodies (first valve body and second valve body) when the valve device according to one embodiment is located at a rest position where the drive unit is not energized.

[0046] Fig.16This is a cross-sectional view showing the open and closed states of valve bodies (first valve body, second valve body) when a driving unit is energized and located at an operating position in a valve device according to an embodiment.

[0047] Fig.17 It is a process diagram for explaining the assembly work of the valve device according to one embodiment.

[0048] Fig.18 It is a process diagram for explaining the assembly work of the valve device according to one embodiment.

[0049] Fig.19 It is a process diagram for explaining the assembly work of the valve device according to one embodiment.

[0050] Fig. 20 It is a process diagram for explaining the assembly work of the valve device according to one embodiment.

[0051] [Explanation of Symbols]

[0052] S: Axis

[0053] 10: Shell

[0054] 10a: Shell body

[0055] 10b: Shell cover

[0056] 11b: First opening

[0057] 11c: Second opening

[0058] 11d: First valve seat

[0059] 11d1: Circular inner edge

[0060] 11d2: Rounded outer edge

[0061] 11e: Second valve seat

[0062] 11e1: Circular inner edge

[0063] 11e2: Rounded outer edge

[0064] 12a: Upstream passage

[0065] 13a: First downstream passage

[0066] 14a: Second downstream passage

[0067] 15a: Joint surface

[0068] 20: First valve core

[0069] 21: Valve substrate

[0070] 21a: Bump part

[0071] 21a1: Mosaic hole

[0072] 21b: Annular plate

[0073] 22: Elastic sealing member

[0074] 22a: Convex curved surface

[0075] 22b: Flat surface

[0076] 22c: Outer periphery

[0077] 30: Second valve core

[0078] 31: Valve substrate

[0079] 31a: bump part

[0080] 31a1: Mosaic hole

[0081] 31b: Annular plate

[0082] 32: Elastic sealing member

[0083] 32a: Convex curved surface

[0084] 32b: Flat surface

[0085] 32c: outer periphery

[0086] 40: Sealing components

[0087] U: Drive unit

[0088] 50: Movable

[0089] 60: Axis

[0090] 61: Positioning unit

[0091] 70: First inner yoke (stator)

[0092] 80: Second inner yoke (stator)

[0093] 90: Cylindrical yoke (stator)

[0094] 100: Flat yoke (stator)

[0095] 110: Force spring

[0096] 120: Coil module

[0097] 121: Spool

[0098] 122: Excitation coil

[0099] 123: Forming Department

[0100] 130: Cylinder member

[0101] Sr: Sealing member DETAILED DESCRIPTION

[0102] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0103] The valve device including the present invention is suitably used in, for example, a cooling water circulation system of a vehicle, etc., in order to adjust the flow of cooling water as a fluid.

[0104] like Figures 1 to 3 As shown, the valve device according to one embodiment includes a housing 10 , a first valve element 20 and a second valve element 30 as valve elements, a sealing member 40 , and a driving unit U fixed to the housing 10 .

[0105] The housing 10 is formed of a resin material or the like, and includes a housing body 10 a and a housing cover 10 b .

[0106] like Figure 6 and Figure 7 As shown, the housing body 10 a includes a cylindrical portion 11 , an upstream duct portion 12 , a first downstream duct portion 13 , a second downstream duct portion 14 , a flange portion 15 , and a cover coupling portion 16 .

[0107] The tubular portion 11 is formed in a substantially cylindrical shape centered on the axis S, and includes a side wall 11a, a first opening 11b, a second opening 11c, a first valve seat 11d, a second valve seat 11e, a central chamber 11f, a first operating chamber 11g, and a second operating chamber 11h.

[0108] The first opening 11b is a circular hole centered on the axis S on the inner side of the joint surface 15a of the flange 15 so as to face the first operating chamber 11g, and is formed so that the first valve element 20 can be inserted from one side in the direction of the axis S. The first opening 11b is closed by engaging the drive unit U with the sealing member 40 interposed therebetween.

[0109] The second opening 11c is a circular hole centered on the axis S on the inner side of the cover joint 16 so as to face the second operating chamber 11h, and is formed so that the second valve body 30 can be inserted from the other side in the direction of the axis S. The second opening 11c is closed by being joined to the housing cover 10b after the second valve body 30 is assembled.

[0110] The first valve seat 11 d is a region where the first valve body 20 is seated, and is formed as a part of a conical surface centered on the axis S and as an annular tapered surface that gradually expands toward the first opening 11 b side.

[0111] That is, Figure 8As shown, the first valve seat 11d is formed as a part of a conical surface which gradually expands at a vertex angle θ1 from a vertex P1 located close to the central chamber 11f toward the first operating chamber 11g on the axis S, and is defined by a circular inner edge 11d1 and a circular outer edge 11d2.

[0112] Here, the apex angle θ1 is formed in a range of, for example, about 110 to 120 degrees, and is set to about 115 degrees here.

[0113] The second valve seat 11 e is a region where the second valve body 30 is seated, and is formed as a part of a conical surface centered on the axis S and as an annular tapered surface that gradually expands toward the second opening 11 c side.

[0114] That is, Fig. 9 As shown, the second valve seat 11e is formed as a part of a conical surface that gradually expands at a vertex angle θ2 from a vertex P2 located close to the central chamber 11f toward the second operating chamber 11h on the axis S, and is defined by a circular inner edge 11e1 and a circular outer edge 11e2.

[0115] Here, the apex angle θ2 is formed in a range of, for example, about 110 to 120 degrees, and is set to about 115 degrees here.

[0116] In addition, in the above-described embodiment, the first valve seat 11 d and the second valve seat 11 e are formed to be plane-symmetrical with respect to a plane perpendicular to the axis S.

[0117] The central chamber 11f is formed between the first valve seat 11d and the second valve seat 11e in the direction of the axis S, is connected to the upstream passage 12a defined by the upstream pipe portion 12, and also functions as an upstream passage located upstream of the first valve seat 11d and the second valve seat 11e.

[0118] The first operating chamber 11g is formed on the downstream side of the first valve seat 11d. It is the area where the first valve core 20 reciprocates in the direction of the axis S. It is connected to the first downstream side passage 13a defined by the first downstream side pipe portion 13, and also functions as the first downstream side passage located on the downstream side of the first valve seat 11d.

[0119] The second operating chamber 11h is formed on the downstream side of the second valve seat 11e. It is the area where the second valve core 30 reciprocates in the direction of the axis S. It is connected to the second downstream side passage 14a defined by the second downstream side pipe portion 14, and also functions as a second downstream side passage located on the downstream side of the second valve seat 11e.

[0120] The upstream pipe section 12 is a region to which a fluid inlet pipe (here, an inlet pipe constituting a part of a cooling water circulation system) of an applicable object is connected, and defines an upstream passage 12a having a circular cross-section centered on an axis L1 perpendicular to the axis S.

[0121] The first downstream pipe section 13 is a region connected to a fluid outlet pipe of an applicable object (here, an outlet pipe constituting a part of a cooling water circulation system), and defines a first downstream passage 13a having a circular cross-section centered on an axis L2 perpendicular to the axis S.

[0122] The second downstream side pipe section 14 is an area connected to another fluid outlet piping of the applicable object (here, another outlet piping constituting a part of the cooling water circulation system), and defines a second downstream side passage 14a with a circular cross-section centered on the axis L3 perpendicular to the axis S.

[0123] The flange portion 15 is an area for joining and fixing the drive unit U, and is formed into a roughly rectangular outline around the first opening portion 11b, and includes a joining surface 15a that is a flat surface perpendicular to the axis S, an annular groove 15b for embedding the sealing member 40, a positioning protrusion 15c protruding from the joining surface 15a toward the axis S, and four female threaded holes 15d for screwing the fastening screws b.

[0124] The cover coupling portion 16 is a region coupled to the housing cover 10 b and includes an annular groove 16 a centered around the axis S around the second opening 11 c and an annular joint surface 16 b around the annular groove 16 a .

[0125] The housing cover 10b is coupled to the cover coupling portion 16 to close the second operating chamber 11h, and includes a disc-shaped cover portion 10b1 fitted in the second opening portion 11c, an annular protrusion portion 10b2 fitted in the annular groove 16a, and an annular joint surface 10b3 joined to the annular joint surface 16b.

[0126] When assembling the valve device, the housing cover 10b is fitted into the cover coupling portion 16 of the housing body 10a after the second valve element 30 is fitted into and fixed to the shaft 60 of the drive unit U, and is coupled by bonding or welding as necessary.

[0127] like Figures 10 to 12 As shown, the first valve element 20 is fitted and fixed at a predetermined position of the shaft 60 of the driving unit U, and includes a valve base 21 formed of a metal material such as stainless steel or a resin material and an elastic sealing member 22 molded to cover the valve base 21 .

[0128] The valve base material 21 is formed of a projection portion 21 a fixed to the shaft 60 and an annular plate portion 21 b extending in a radial direction perpendicular to the axis S from the outer periphery of the projection portion 21 a .

[0129] The projection portion 21a is formed into a cylindrical shape defining a fitting hole 21a1 centered on the axis S. The annular plate portion 21b includes a plurality of annular protrusions 21b1 on both sides in the direction of the axis S, which are concentric with the axis S. Furthermore, the tops P and valleys V defined by the plurality of annular protrusions 21b1 define concave and convex surfaces on both sides of the valve base material 21.

[0130] The elastic sealing member 22 is made of rubber material or the like and is joined to the annular plate portion 21b of the valve substrate 21 in such a manner as to cover the annular plate portion 21, i.e., is molded relative to the valve substrate 21 in such a manner as to be fixed to the valve substrate 21 via the region including the concave and convex surface of the annular plate portion 21b.

[0131] The elastic sealing member 22 is formed to include convex curved surfaces 22a convex outward on both sides in the axis S direction, an annular flat surface 22b and an outer peripheral edge 22c forming a cylindrical surface.

[0132] Here, the convex curved surface 22a is a curved surface having a predetermined curvature, for example, Fig.10 As shown, it is formed as a part of a spherical surface Sp1 having a center C1 and a radius R1 on the axis S. Moreover, the convex curved surface 22a is formed over a predetermined range from the outer peripheral edge 22c toward the radial inner side. Fig.12 As shown, it is formed so as to extend beyond the circular inner edge 11d1 of the first valve seat 11d to the radial inner side.

[0133] The flat surface 22 b is formed at the same height position as the height dimension of the projection portion 21 a of the valve base 21 in the axis S direction.

[0134] The outer peripheral edge 22c is formed to have an outer diameter smaller than the diameter of the circular outer edge 11d2 of the first valve seat 11d (diameter perpendicular to the axis S). That is, the outer diameter of the first valve body 20 is formed to be equal to or smaller than the outer diameter of the first valve seat 11d.

[0135] In the valve closing position of the first valve body 20 having the above structure, the convex curved surface 22a of the elastic sealing member 22 is in close contact with the first valve seat 11d. Fig.15 The rest position shown in FIG. 1 is separated from the first valve seat 11d and the valve is opened. Fig.16 In the operating position shown, the valve is seated on the first valve seat 11d and the valve is closed.

[0136] Here, the first valve element 20 is formed to include a convex curved surface 22a that contacts the annular conical surface serving as the first valve seat 11d, so that Fig.13As shown by the one-dot chain line and the two-dot chain line in FIG. 1 , even if the shaft 60 is seated on the first valve seat 11 d with an inclination or axial deviation, the convex curved surface 22 a can reliably come into close contact with the annular tapered surface to ensure airtightness.

[0137] In particular, the convex curved surface 22a is formed to include a part of a spherical surface having a center C1 on the axis S. Therefore, even if the shaft 60 is seated with an inclination, the valve can be securely closed in close contact.

[0138] Moreover, the first valve core 20 is formed with an outer diameter smaller than the diameter of the circular outer edge 11d2 of the first valve seat 11d. Therefore, even if the first valve core 20 is seated with the shaft 60 tilted, the outer peripheral edge 22c of the first valve core 20 will not ride on the outside of the first valve seat 11d and can be securely in close contact to close the valve.

[0139] Moreover, in the first valve core 20, the elastic sealing member 22 is bonded and fixed to the valve base material 21 via the region including the concave and convex surface. Therefore, compared with the case of bonding to a simple flat surface, the close contact surface is increased, thereby being able to improve the mechanical bonding strength through the anchor effect and the like.

[0140] Furthermore, the elastic sealing member 22 and the convex block portion 21a are formed to have the same thickness dimension in the direction of the axis S. That is, the outer contour of the first valve core 20 is formed as a continuous integrated surface, so the joining strength between the two can be improved compared with a form with a discontinuous step difference, and even if the shaft 60 is tilted, the area further inside than the convex curved surface 22a will not interfere with the first valve seat 11d, so that both thinness and miniaturization can be achieved and the valve closing action can be performed reliably.

[0141] Furthermore, the first valve body 20 is rotationally symmetrical about the axis S and is formed plane-symmetrically with respect to a plane perpendicular to the axis S. Therefore, the first valve body 20 can be assembled with either of the convex curved surfaces 22a facing the first valve seat 11d without directionality, which facilitates assembly work.

[0142] like Figures 10 to 12 As shown, the second valve core 30 is embedded and fixed at a position abutting against the positioning portion 61 of the shaft 60 of the drive unit U, and includes a valve base material 31 formed using a metal material such as stainless steel or a resin material and an elastic sealing component 32 molded in a manner covering the valve base material 31.

[0143] The valve base material 31 is formed of a boss portion 31 a fixed to the shaft 60 and an annular plate portion 31 b extending in a radial direction perpendicular to the axis S from the outer periphery of the boss portion 31 a .

[0144] The projection portion 31a is formed into a cylindrical shape defining a fitting hole 31a1 centered on the axis S. The annular plate portion 31b includes a plurality of annular protrusions 31b1 on both sides in the direction of the axis S, which are concentric with the axis S. Furthermore, the tops P and valleys V defined by the plurality of annular protrusions 31b1 define concave and convex surfaces on both sides of the valve base material 31.

[0145] The elastic sealing member 32 is made of rubber material or the like and is joined to the annular plate portion 31b of the valve substrate 31 in such a manner as to cover the annular plate portion 31b, i.e., is molded relative to the valve substrate 31 in such a manner as to be fixed to the valve substrate 31 via the region including the concave and convex surface of the annular plate portion 31b.

[0146] The elastic sealing member 32 is formed to include convex curved surfaces 32a that are convex outward on both sides in the axis S direction, an annular flat surface 32b, and an outer peripheral edge 32c that is a cylindrical surface.

[0147] Here, the convex curved surface 32a is a curved surface having a predetermined curvature, for example, Fig.10 As shown in FIG. 1 , the convex curved surface 32a is formed to have a center C2 on the axis S and include a portion of a spherical surface Sp2 of a radius R2. Furthermore, the convex curved surface 32a is formed over a predetermined range from the outer peripheral edge 32c toward the radial inner side. Fig.12 As shown in FIG. 1 , the second valve seat 11e is formed so as to extend radially inward beyond the circular inner edge 11e1 of the second valve seat 11e.

[0148] The flat surface 32 b is formed at the same height position as the height dimension of the projection portion 31 a of the valve base material 31 in the axis S direction.

[0149] The outer peripheral edge 32c is formed to have an outer diameter smaller than the diameter of the circular outer edge 11e2 of the second valve seat 11e (diameter perpendicular to the axis S). That is, the outer diameter of the second valve body 30 is formed to be equal to or smaller than the outer diameter of the second valve seat 11e.

[0150] In the second valve body 30 having the above structure, the convex curved surface 32a of the elastic sealing member 32 is in close contact with the second valve seat 11e at the valve closing position. Fig.15 The valve is seated on the second valve seat 11e at the rest position shown in the figure and the valve is closed. Fig.16 In the operating position shown, the valve is released from the first valve seat 11d and the valve is opened.

[0151] Here, the second valve element 30 is formed to include a convex curved surface 32a that contacts the annular conical surface serving as the second valve seat 11e, so that Fig.14As shown by the one-dot chain line and the two-dot chain line in FIG. 1 , even if the shaft 60 is seated on the second valve seat 11 e in a state where the shaft 60 is tilted or axially misaligned, the convex curved surface 32 a can be reliably in close contact with the annular tapered surface to ensure airtightness.

[0152] In particular, the convex curved surface 32a is formed to include a part of a spherical surface having a center C2 on the axis S. Therefore, even if the shaft 60 is seated with an inclination, the valve can be securely closed in close contact.

[0153] Moreover, the second valve core 30 is formed with an outer diameter less than the diameter of the circular outer edge 11e2 of the second valve seat 11e. Therefore, even if the second valve core 30 is seated in a tilted state of the shaft 60, the outer peripheral edge 32c of the second valve core 30 will not ride on the outside of the second valve seat 11e and can be effectively and tightly connected to close the valve.

[0154] Moreover, in the second valve core 30, the elastic sealing member 32 is bonded and fixed to the valve base material 31 via the region including the concave and convex surface. Therefore, compared with the case of bonding to a simple flat surface, the close contact surface is increased, thereby being able to improve the mechanical bonding strength through the anchor effect and the like.

[0155] Furthermore, the elastic sealing member 32 and the convex block portion 31a are formed to have the same thickness dimension in the direction of the axis S. That is, the outer contour of the second valve core 30 is formed as a continuous integrated surface, so the joining strength between the two can be improved compared with a form with a discontinuous step difference, and even if the shaft 60 is tilted, the area further inside than the convex curved surface 32a will not interfere with the second valve seat 11e, so that both thinness and miniaturization can be achieved and the valve closing action can be performed reliably.

[0156] Furthermore, the second valve body 30 is rotationally symmetrical about the axis S and is formed plane-symmetrically with respect to a plane perpendicular to the axis S. Therefore, the second valve body 30 can be assembled with either of the convex curved surfaces 32a facing the second valve seat 11e without directionality, which facilitates assembly work.

[0157] Here, as described above, the first valve core 20 and the second valve core 30 are formed by the valve base material 21 and the valve base material 31 having the same structure and form, and the elastic sealing member 22 and the elastic sealing member 32 having the same structure and form. That is, the parts of the first valve core 20 and the second valve core 30 are parts of the same shape (form), so compared with the case of using separate parts, the management man-hours can be reduced, thereby achieving low cost.

[0158] Furthermore, the first valve element and the second valve element do not need to be identical parts as long as they have convex curved surfaces, and may be formed in different shapes according to the specifications of the first valve seat and the second valve seat having annular conical surfaces of the valve device.

[0159] As described above, the first valve core 20 and the second valve core 30 are arranged to be isolated from each other in the direction of the axis S relative to the shaft 60. Through the reciprocating motion of the shaft 60, the first valve core 20 reciprocates in the first operating chamber 11g to sit on and disengage relative to the first valve seat 11d, and the second valve core 30 reciprocates in the second operating chamber 11h to sit on and disengage relative to the second valve seat 11e.

[0160] The sealing member 40 is formed into a disk shape by a rubber material or the like which is elastically deformable in a thin film shape, and is Figure 3 As shown, it includes an annular fitting portion 41 , a central connecting portion 42 , and a communicating hole 43 .

[0161] The communication hole 43 is formed to have a size that prevents foreign matter from passing therethrough, and serves as a vent hole to contribute to the pressure regulating function.

[0162] The seal member 40 is connected by passing the shaft 60 of the drive unit U through the central connecting portion 42 , and the annular fitting portion 41 is fitted into the annular groove 15 b of the housing 10 to engage with the flat yoke 100 of the drive unit U to be clamped.

[0163] In the assembled state, the sealing member 40 performs a sealing function at the joint interface between the housing 10 and the drive unit U, and elastically deforms to move integrally with the shaft 60 to prevent foreign matter in the fluid from intruding into the drive unit U. In addition, the sealing member 40 performs a pressure regulating function through the communicating hole 43 during elastic deformation to avoid hindering the movement of the shaft 60.

[0164] like Figure 3 and Figure 4 As shown, the drive unit U includes a mover 50, a shaft 60, a first inner yoke 70, a second inner yoke 80, a cylindrical yoke 90, a flat yoke 100, an urging spring 110, a coil module 120, a cylinder member 130, and a sealing member Sr.

[0165] The coil module 120 includes a bobbin 121 , an exciting coil 122 , and a molded portion 123 in which the bobbin 121 and the coil 122 are embedded.

[0166] Furthermore, the first inner yoke 70 , the second inner yoke 80 , the cylindrical yoke 90 , and the flat yoke 100 function as a stator that forms a magnetic circuit.

[0167] The mover 50 functions as a magnetic circuit through which magnetic lines of force pass, and as a movable iron core that moves along the axis S direction when the coil 122 is energized. The mover 50 is formed into a cylindrical shape by machining or forging using free-cutting steel (SUM) or the like. Figure 4 and Figure 5 As shown, it includes an outer peripheral surface 51 , a fitting hole 52 , a spring support portion 53 , a convex portion 54 , and an annular end surface 55 .

[0168] The outer peripheral surface 51 is formed as a cylindrical surface centered on the axis S, and is in slidable contact with the inner wall of the tube member 130 .

[0169] The fitting hole 52 is a through hole centered on the axis S, is a region into which one end side region of the shaft 60 is press-fitted, and is formed with an inner diameter slightly smaller than the outer diameter of the shaft 60 .

[0170] The spring support portion 53 is formed as a circular recessed portion centered on the axis S, supports one end portion 111 of the biasing spring 110 , and positions the one end portion 111 in a direction perpendicular to the axis S.

[0171] The convex portion 54 is formed in a truncated cone shape and is formed so as to enter the concave portion 83 of the second inner yoke 80 without contact.

[0172] The annular end surface 55 is formed as a flat surface perpendicular to the axis S, and faces the annular end surface 84 of the second inner yoke 80 in the axis S direction.

[0173] Furthermore, in order to make the movement of the movable member 50 smooth, for example, a groove extending in the direction of the axis S may be formed on the outer peripheral surface so that the front and rear pressures are adjusted when the movable member 50 moves.

[0174] The shaft 60 is formed of a non-magnetic material, for example, a metal material such as stainless steel or a resin material, and has a cylindrical shape elongated in the direction of the axis S, and includes a positioning portion 61 on the other end side.

[0175] like Figure 3 , Figure 4 , Fig.10 As shown, the positioning portion 61 is formed in a flange shape protruding in the radial direction, and the second valve body 30 is abutted in the axis S direction to be positioned.

[0176] By providing the positioning portion 61 as described above, when the second valve body 30 is fitted and fixed to the shaft 60 inside the housing body 10 a , the second valve body 30 can be easily positioned at a predetermined position on the shaft 60 by simply making contact with the positioning portion 61 .

[0177] Furthermore, one end side region of the shaft 60 is fitted into the fitting hole 52 and fixed to the mover 50. Furthermore, the central connecting portion 42 of the sealing member 40 is connected to the shaft 60 at the approximate center in the axis S direction, the first valve core 20 is fixed by fitting to the other end (free end) side closer to the center in the axis S direction, and the second valve core 30 is fixed by fitting to the other end side in a manner of abutting against the positioning portion 61.

[0178] Furthermore, the shaft 60 reciprocates along the axis S direction integrally with the mover 50 and the first and second valve bodies 20 and 30 .

[0179] The first inner yoke 70 is formed by machining or forging using wrought iron or the like, and functions as a magnetic path through which magnetic lines of force pass. Figure 4 and Figure 5 As shown, it is formed into a cylindrical shape and includes a first outer peripheral surface 71 , an inner peripheral surface 72 , and a first annular flange portion 73 .

[0180] The first outer peripheral surface 71 is formed as a cylindrical surface centered on the axis S and is formed so as to fit the inner peripheral surface 91 a of the small diameter cylindrical portion 91 of the cylindrical yoke 90 and the bobbin 121 of the coil module 120 .

[0181] The inner peripheral surface 72 is formed as a cylindrical surface centered on the axis S, and is formed so as to be fitted with the tubular member 130 .

[0182] The first annular flange portion 73 is formed in a disk shape that protrudes from the first outer peripheral surface 71 in a radial direction perpendicular to the axis S, and includes an annular flat surface 73 a and an annular tapered surface 73 b .

[0183] The annular flat surface 73 a is a flat surface perpendicular to the axis S, and is joined to the annular joining surface 94 a of the cylindrical yoke 90 in the axis S direction.

[0184] The annular tapered surface 73 b is formed on the opposite side to the annular flat surface 73 a and is formed so as to gradually expand toward the annular joint surface 94 a of the cylindrical yoke 90 .

[0185] The second inner yoke 80 is formed by machining or forging using wrought iron or the like, and functions as a magnetic circuit through which magnetic lines of force pass, and also functions as a fixed iron core that attracts the mover 50 when the coil 122 is energized. Figure 4 and Figure 5 As shown, it is formed into a cylindrical shape and includes a second outer peripheral surface 81 , a second annular flange portion 82 , a recessed portion 83 , an annular end surface 84 , a spring receiving recessed portion 85 , and a guide hole 86 .

[0186] The second outer peripheral surface 81 is formed as a cylindrical surface centered on the axis S, and is formed so that the bobbin 121 of the coil module 120 is fitted through the cylindrical member 130 and the fitting hole 103 of the flat yoke 100 is fitted.

[0187] The second annular flange portion 82 is formed in a disk shape that protrudes from the second outer peripheral surface 81 in a radial direction perpendicular to the axis S, and includes an annular flat surface 82 a and an annular tapered surface 82 b .

[0188] The annular flat surface 82 a is a flat surface perpendicular to the axis S, and is joined to the annular joining surface 101 a of the flat yoke 100 in the axis S direction.

[0189] The annular tapered surface 82 b is formed on the opposite side to the annular flat surface 82 a and is formed so as to gradually expand toward the annular joint surface 101 a of the flat yoke 100 .

[0190] The recessed portion 83 is formed in a truncated cone shape and is formed so as to accommodate the raised portion 54 of the movable member 50 in a non-contact manner in the axis S direction.

[0191] The annular end surface 84 is formed as a flat surface perpendicular to the axis S, and faces the annular end surface 55 of the mover 50 in the axis S direction.

[0192] The spring housing recess 85 is formed to have a smaller diameter than the recess 83 to accommodate the biasing spring 110 , and includes a spring support portion 85 a that supports the other end portion 112 of the biasing spring 110 .

[0193] The guide hole 86 is formed as a cylindrical hole centered on the axis S, and guides the shaft 60 slidably in the axis S direction.

[0194] In order to function as a magnetic circuit through which magnetic lines of force pass, the cylindrical yoke 90 is a cylindrical pressed product having a bottom that is pressed (deep drawn) using a metal plate such as wrought iron of a predetermined thickness. Figure 1 , Figure 4 , Figure 5 As shown, it includes a small diameter cylindrical portion 91, a bottom wall 92, a large diameter cylindrical portion 93, an annular flat plate portion 94, a flange portion 95, and a notch portion 96.

[0195] The small diameter cylindrical portion 91 defines an inner circumferential surface 91a centered on the axis S. The first outer circumferential surface 71 of the first inner yoke 70 is fitted into the inner circumferential surface 91a. That is, the first inner yoke 70 is joined to the cylindrical yoke 90 in a radial direction perpendicular to the axis S via the inner circumferential surface 91a of the small diameter cylindrical portion 91 and fixed.

[0196] The bottom wall 92 is formed to be continuous with the end portion of the small-diameter cylindrical portion 91 in the direction of the axis S, and is arranged in a non-contact manner with the tube member 130 .

[0197] The large-diameter cylindrical portion 93 defines an inner peripheral surface 93 a centered on the axis S. The molded portion 123 of the coil module 120 is fitted into the inner peripheral surface 93 a.

[0198] The annular flat plate portion 94 is formed continuously at the boundary region between the small diameter cylindrical portion 91 and the large diameter cylindrical portion 93 , and defines an annular joint surface 94 a to which the annular flat surface 73 a of the first inner yoke 70 is joined in the axis S direction.

[0199] The flange portion 95 is formed in a substantially rectangular shape and is continuous with the end of the large diameter cylindrical portion 93, and includes four circular holes 95a for passing the fastening screws b. When assembled, the flange portion 95 is joined to the flat yoke 100 to form a magnetic circuit.

[0200] The notch portion 96 is formed so as to expose the connector 123 a of the coil module 120 to the outside.

[0201] In order to be joined to the open end of the cylindrical yoke 90 and function as a magnetic path for passing magnetic lines of force, the flat yoke 100 is formed by stamping and bending a metal plate such as wrought iron having a predetermined plate thickness. Figure 4 and Figure 5 As shown, it includes a substantially rectangular flat plate portion 101 , a mounting portion 102 bent from the flat plate portion 101 and extending in the direction of the axis S, and a fitting hole 103 .

[0202] The flat plate portion 101 includes an annular joint surface 101a that tightly joins the annular flat surface 82a of the second inner yoke 80 in the axis S direction, an annular joint surface 101b that tightly joins the flange portion 95 of the cylindrical yoke 90 in the axis S direction, and four circular holes 101c for passing the fastening screws b.

[0203] The mounting portion 102 is used to mount the valve device on an applicable object, and includes two circular holes 102a through which fixing bolts pass.

[0204] The fitting hole 103 is a region into which the second outer peripheral surface 81 of the second inner yoke 80 fits, and defines a cylindrical inner peripheral surface 103a centered on the axis S. The inner peripheral surface 103a is closely joined to the second outer peripheral surface 81 of the second inner yoke 80 in a radial direction perpendicular to the axis S.

[0205] That is, the second inner yoke 80 is joined to and fixed to the flat plate-like yoke 100 in the radial direction perpendicular to the axis S via the inner peripheral surface 103 a of the fitting hole 103 .

[0206] The urging spring 110 is a compression type coil spring, and is arranged to be compressed in the direction of the axis S, with one end 111 abutting against the spring support portion 53 of the mover 50 and the other end 112 abutting against the spring support portion 85a of the second inner yoke 80. The urging spring 110 urges the mover 50 in the direction of the axis S toward the rest position.

[0207] As described above, the coil module 120 includes the bobbin 121 , the exciting coil 122 , and the forming portion 123 .

[0208] The bobbin 121 is formed using a resin material such as Figure 5As shown, it includes a small diameter cylindrical portion 121a , a large diameter cylindrical portion 121b , an annular step portion 121c , a flange portion 121d , a flange portion 121e , and a recessed portion 121f , with the axis S being the center.

[0209] The small diameter cylindrical portion 121 a is formed so that the cylindrical member 130 is fitted inside the small diameter cylindrical portion 121 a and the coil 122 is wound around the small diameter cylindrical portion 121 a .

[0210] The large-diameter cylindrical portion 121 b is formed so that the first outer peripheral surface 71 of the first inner yoke 70 fits inside the large-diameter cylindrical portion 121 b and the coil 122 is wound around the outside thereof.

[0211] The annular step portion 121 c abuts against an end surface of the first inner yoke 70 to be positioned along the axis S direction in an assembled state.

[0212] The flange portion 121 d is formed in an annular shape centered on the axis S and is arranged to face the first annular flange portion 73 (annular tapered surface 73 b ) of the first inner yoke 70 and the annular flat plate portion 94 of the cylindrical yoke 90 in the axis S direction.

[0213] The flange portion 121 e is formed in an annular shape centered on the axis S, defines an annular tapered surface 121 e 1 at its root region, and is arranged to face the flat yoke 100 in the axis S direction and to support the flange portion 133 of the tubular member 130 .

[0214] The recessed portion 121f is formed to accommodate the flange portion 133 of the tubular member 130 and to accommodate the seal member Sr.

[0215] The coil 122 is for exciting the magnet to generate magnetic force by passing electricity, is wound around the small diameter cylindrical portion 121 a and the large diameter cylindrical portion 121 b of the bobbin 121 , and is connected to two terminals 122 a .

[0216] The molded portion 123 is molded using a resin material, and is formed so as to cover the entirety in a state where the coil 122 is wound around the bobbin 121 and the terminal 122 a is connected, and the terminal 122 a is exposed in the connector 123 a .

[0217] The cylinder member 130 is formed by pressing (deep drawing) a metal plate made of a thin plate of non-magnetic material such as stainless steel into a bottomed cylindrical shape. Figure 4 and Figure 5 As shown, it includes a cylindrical portion 131 centered on the axis S, a bottom wall 132 , and a flange portion 133 .

[0218] The cylindrical portion 131 is formed such that the outer peripheral surface 51 of the mover 50 is slidably inserted therein and the second outer peripheral surface 81 of the second inner yoke 80 is engaged therewith, and the inner peripheral surface 72 of the first inner yoke 70 and the small diameter cylindrical portion 121a of the bobbin 121 of the coil module 120 are engaged therewith.

[0219] The bottom wall 132 is arranged so that the mover 50 and the shaft 60 do not contact each other in the rest state.

[0220] The flange portion 133 abuts against the flange portion 121 e of the bobbin 121 of the coil module 120 to be positioned in the axis S direction.

[0221] The cylinder member 130 accommodates the mover 50 and the second inner yoke 80 in the assembled state and exposes the shaft 60 fixed to the mover 50 to the outside, here, to the internal space of the housing 10 (the first operating chamber 11g, the central chamber 11f, and the second operating chamber 11h).

[0222] That is, the cylindrical member 130 has the function of slidably guiding the movable member 50 and sealing to separate the inner region where the movable member 50 moves from the outer region to prevent the fluid and the like from leaking to the outside.

[0223] The sealing member Sr is an O-ring formed of a rubber material, and is interposed between the flange portion 133 of the cylindrical member 130 and the flat yoke 100 in the assembled state to seal the flange portion 133 and prevent the fluid or the like from leaking to the outside.

[0224] Next, refer to Figures 17 to 20 , while explaining the assembly operation of the valve device with the above structure.

[0225] First, before assembling the valve device, the drive unit U is assembled. In the assembly process, the first valve element 20 is fitted and fixed to the shaft 60 at a predetermined position, and the central connection portion 42 of the sealing member 40 is connected. Then, the shaft 60 is fitted and fixed to the mover 50 .

[0226] Next, if Fig.17 As shown, the drive unit U in which the first valve element 20 and the sealing member 40 are installed, the housing body 10a, the second valve element 30, the housing cover 10b, and four fastening screws b are prepared.

[0227] Then, the shaft 60 and the first valve core 20 are inserted into the housing body 10a through the first opening 11b, and the annular fitting portion 41 of the sealing member 40 is fitted into the annular groove 15b. Fig.18As shown, the flat plate portion 101 of the flat yoke 100 is joined to the joining surface 15a of the flange portion 15. Then, the fastening screw b is screwed into the female threaded hole 15d of the housing body 10a through the circular hole 95a and the circular hole 101c.

[0228] Then, if Fig.19 As shown, the second valve element 30 is inserted into the housing body 10a through the second opening 11c, and is fixed to the shaft 60 by abutting against the positioning portion 61 while holding the shaft 60 using a predetermined jig inserted from the upstream passage 12a or the first downstream passage 13a.

[0229] Then, if Fig. 20 As shown, the housing cover 10b is fitted and fixed to the cover joint portion 16 of the housing body 10a. In addition, the housing cover 10b can also be fixed using an adhesive or the like as appropriate.

[0230] The assembly of the valve device is completed through the above process. The above assembly process is an example, and the valve device can also be assembled through other methods and processes.

[0231] Next, the operation of the valve device according to one embodiment will be described.

[0232] First, when the coil 122 is not energized, Fig.15 As shown, the mover 50 and the shaft 60 are positioned at the rest position by the biasing force of the biasing spring 110. In the rest position, the first valve element 20 is separated from the first valve seat 11d and is in the valve open state, and the second valve element 30 is seated on the second valve seat 11e and is in the valve closed state.

[0233] Therefore, the fluid flowing in from the upstream passage 12a flows into the first downstream passage 13a through the central chamber 11f and the first operation chamber 11g.

[0234] On the other hand, when the coil 122 is energized, an electromagnetic force is generated, such as Fig.16 As shown, the mover 50 is attracted by the second inner yoke 80, and the mover 50 and the shaft 60 are positioned to the operating position against the biasing force of the biasing spring 110. In the operating position, the first valve element 20 is seated on the first valve seat 11d to be in a closed valve state, and the second valve element 30 is separated from the second valve seat 11e to be in an open valve state.

[0235] Therefore, the fluid flowing in from the upstream passage 12a flows into the second downstream passage 14a through the central chamber 11f and the second operation chamber 11h.

[0236] By switching the coil 122 between energization and de-energization, the fluid can flow from the first downstream passage 13a to the external fluid delivery pipe, or from the second downstream passage 14a to another external fluid delivery pipe.

[0237] Here, in the structure of the shell 10 including the first valve seat 11d and the second valve seat 11e forming an annular conical surface which is a part of a cone with the axis S as the center, and the first valve core 20 and the second valve core 30 including the convex curved surface 22a and the convex curved surface 32a which are in contact with the annular conical surfaces of the first valve seat 11d and the second valve seat 11e respectively, even if the shaft 60 deviates slightly from the axis or moves obliquely, the first valve core 20 can be in close contact with the first valve seat 11d and the valve can be securely closed, and the second valve core 30 can be in close contact with the second valve seat 11e and the valve can be securely closed.

[0238] In the above embodiment, a structure including the first valve core 20 and the second valve core 30 as the valve core is shown, but the present invention is not limited thereto, and a structure in which one valve core is provided on the shaft may be adopted. In this case, the valve base material of the valve core and the shaft may be integrally formed of a resin material, and the elastic sealing member may be molded relative to the valve base material of the integrally formed shaft.

[0239] In the above-described embodiment, as valve cores, a first valve core 20 and a second valve core 30 including a valve substrate 21, a valve substrate 31 and an elastic sealing member 22, an elastic sealing member 32 are shown, but the present invention is not limited to this. As long as the valve core includes a convex curved surface that contacts a valve seat having an annular conical surface, a valve core formed of a single type of material, such as a metal material or a resin material, may also be used.

[0240] In the above-described embodiment, a valve core (first valve core 20, second valve core 30) is shown which is rotationally symmetrical around an axis S and is formed face-symmetrically with respect to a plane perpendicular to the axis S, but the present invention is not limited thereto. As long as the structure of the present invention is included, the valve core may also be formed asymmetrically with respect to a plane perpendicular to the axis S.

[0241] In the above embodiment, the sealing member 40 having a structure similar to a diaphragm is used as a constituent element of the valve device to prevent foreign matter in the fluid from intruding into the drive unit U side, but the present invention is not limited thereto, and a lip seal, for example, may be embedded in the end of the guide hole 86 of the second inner yoke to seal the periphery of the shaft 60. In this way, the pressure of the fluid does not act on the movable part, so that the mover and the valve core can be driven with a smaller electromagnetic force.

[0242] As described above, the valve device of the present invention can be used as a valve device in a cooling water circulation system of a vehicle, etc., and can also be useful as a valve device in other fields because the valve core can be in close contact with the valve seat and the valve seat can be reliably closed even if the axis is slightly deviated or tilted.

Claims

1. A valve device, comprising: A housing defining an upstream passage and a downstream passage for fluid to pass through, and a valve seat interposed between the upstream passage and the downstream passage; A shaft, which reciprocates along a specified axis; and The valve core is fixed to the shaft and is seated and released relative to the valve seat. The valve device is characterized in that The valve seat is formed as an annular conical surface that is a part of a conical surface centered on the axis. The valve element is formed to include a convex curved surface that contacts the annular tapered surface when the valve element is seated on the valve seat.

2. The valve device according to claim 1, characterized in that The convex curved surface is formed to include a portion of a spherical surface having a center on the axis.

3. The valve device according to claim 1, characterized in that The valve seat is defined by a circular inner edge and a circular outer edge centered on the axis. The valve core includes an outer peripheral edge having an outer diameter less than the diameter of the circular outer edge, The convexly curved surface is formed over a predetermined range from the outer peripheral edge toward the radial inner side.

4. The valve device according to claim 1, characterized in that The valve core includes a valve base fixed to the shaft and an elastic sealing member fixed to the valve base. The convex curved surface is formed on the elastic sealing member.

5. The valve device according to claim 4, characterized in that The valve base includes a protrusion portion fixed to the shaft and an annular plate portion extending from the outer periphery of the protrusion portion in a radial direction perpendicular to the axis. The elastic sealing member is joined so as to cover the annular plate portion.

6. The valve device according to claim 5, characterized in that The elastic sealing member and the projection portion are formed to have the same thickness dimension in the axial direction.

7. The valve device according to claim 4, characterized in that The valve substrate includes a concavoconvex surface on a bonding interface with the elastic sealing member.

8. The valve device according to claim 4, characterized in that The resilient sealing member is molded relative to the valve substrate.

9. The valve device according to claim 1, characterized in that The valve core is rotationally symmetrical about the axis and is formed in plane symmetry with respect to a plane perpendicular to the axis.

10. The valve device according to any one of claims 1 to 9, characterized in that The downstream passage includes a first downstream passage and a second downstream passage branching from the upstream passage. The valve seat includes a first valve seat facing the first downstream passage and a second valve seat facing the second downstream passage. The valve element includes a first valve element corresponding to the first valve seat and a second valve element corresponding to the second valve seat, which are arranged to be separated from each other in the axial direction.

11. The valve device according to claim 10, characterized in that The first valve element is in a valve-opening state in which the first valve element is separated from the first valve seat, while the second valve element is in a valve-closed state in which the second valve element is seated on the second valve seat. The second valve element is in a valve-opening state in which the second valve element is separated from the second valve seat in a valve-closing state in which the first valve element is seated on the first valve seat.

12. The valve device according to claim 11, characterized in that A drive unit is included to drive the shaft.

13. The valve device according to claim 12, characterized in that The driving unit includes a mover to which the shaft is fixed, an exciting coil, and a stator forming a magnetic circuit. The shaft is formed of a non-magnetic material.

14. The valve device according to claim 13, characterized in that The valve base is made of non-magnetic material. The elastic sealing member is formed of a rubber material.

15. The valve device according to claim 12, characterized in that The first valve core and the second valve core are fixed to the shaft by fitting. The shell includes: a shell body, including a joint surface for joining the drive unit, a first opening portion formed on the inner side of the joint surface so that the first valve core can be inserted from one side of the axial direction, the first valve seat and the second valve seat continuous with the first opening portion and arranged in sequence along the axial direction, and a second opening portion formed so that the second valve core can be inserted from the other side of the axial direction; and a shell cover, which is combined with the shell body to close the second opening portion.

16. The valve device according to claim 15, characterized in that The shaft includes a positioning portion for positioning the second valve element in the axial direction.

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