Valve device

Abstract

This valve device includes: a valve seat provided with a valve hole; a valve body that opens and closes the valve hole by coming into contact with and separating from the valve seat; a valve shaft to which the valve body is attached; a movable core that moves the valve shaft in the axial direction of the valve shaft; a fixed core that is disposed so as to face the movable core in the axial direction of the valve shaft; and a cylindrical bobbin on the inner side of which the moveable core and the fixed core are provided, and on the outer side of which a coil is provided. The valve seat and the bobbin are integrally formed by means of a connection part.

Description

Valve device

[0001] The present disclosure relates to a valve device that opens and closes a fluid flow path.

[0002] Patent Document 1 discloses a valve device in which a coil sealing portion is integrally connected to a valve seat forming portion.

[0003] Japanese Patent Application Laid-Open No. 2003-232460

[0004] In the valve device of Patent Document 1, a coil sealing portion separate from the bobbin is integrally connected to a valve seat forming portion, and the valve seat forming portion and the bobbin are formed separately. As a result, axial misalignment (i.e., misalignment of the center axis) between the valve seat provided in the valve seat forming portion and the bobbin may occur, which may result in axial misalignment between the valve hole provided in the valve seat and the valve stem connected to the movable core provided inside the bobbin. This may result in fluid leakage between the valve seat and the valve disc when the valve is in the fully closed state.

[0005] Therefore, the present disclosure has been made to solve the above-mentioned problems, and aims to provide a valve device that can suppress axial misalignment between the valve stem and the valve hole and reduce fluid leakage when in a fully closed state.

[0006] One form of the present disclosure made to solve the above problems is a valve device having a valve seat with a valve hole, a valve disc that opens and closes the valve hole by abutting and moving away from the valve seat, a valve stem to which the valve disc is attached, a movable core that moves the valve stem in the axial direction of the valve stem, a fixed core that is positioned opposite the movable core in the axial direction of the valve stem, and a cylindrical bobbin on the inside of which the movable core and the fixed core are provided and on the outside of which a coil is provided, wherein the valve seat and the bobbin are formed integrally via a connecting portion.

[0007] According to this aspect, the valve seat and the bobbin are integrally formed via a connecting portion, which improves the centering accuracy between the valve hole in the valve seat and the valve stem that is moved by the movable core provided inside the bobbin, thereby suppressing axial misalignment between the valve hole and the valve stem and reducing fluid leakage in the fully closed state.

[0008] In the above aspect, it is preferable that the connecting portion is formed by a plurality of pillar portions.

[0009] According to this aspect, the shape of the connecting portion can be simplified, thereby reducing the effect of the connecting portion on the flow of fluid flowing through the valve device.

[0010] In the above aspect, it is preferable that the plurality of columnar portions are arranged at equal intervals from one another in the circumferential direction of the annular valve seat.

[0011] According to this aspect, the degree of freedom in the circumferential direction of the connecting portion and the valve seat of the bobbin is increased, thereby improving the mountability of the valve device.

[0012] In the above aspect, it is preferable that an opening is provided between adjacent columnar portions, and when the connecting portion is viewed from the bobbin side, the columnar portion has a flat portion parallel to the central axis of the opening.

[0013] According to this aspect, the distance between adjacent columnar portions can be increased to increase the opening area of ​​the opening, thereby reducing pressure loss of the fluid flowing through the opening, and therefore increasing the flow rate of the fluid in the valve device.

[0014] In the above aspect, it is preferable that the valve has a body that accommodates the valve seat and the connecting portion, and when the connecting portion is viewed from the bobbin side, a gap is formed between the columnar portion and the body that allows fluid to flow.

[0015] According to this aspect, by causing the fluid to flow through the gap between the columnar portion and the body, the fluid can flow downstream without stagnation, thereby reducing pressure loss of the fluid.

[0016] In the above aspect, it is preferable that an opening is provided between adjacent columnar portions, and that at least one of the multiple openings is provided with a spacer member that guides the direction in which the fluid flows.

[0017] According to this aspect, the fluid flow direction at the opening is guided by the spacer member, which prevents the fluid from entering in a direction other than the flow direction of the flow channel. As a result, the fluid flows smoothly, reducing pressure loss of the fluid.

[0018] In the above aspect, it is preferable that the fluid is a liquid, and the spacer member swells when it comes into contact with the liquid flowing through the opening.

[0019] According to this aspect, the spacer member swells and presses against the adjacent columnar portions, so that the spacer member can be more firmly fixed to the columnar portions. In addition, the spacer member swells on the side surface of the body, so that the spacer member can be tightly attached to the side surface of the body.

[0020] In the above aspect, it is preferable that the valve has a body that accommodates the valve body, the body has an inlet flow path connected to the part that accommodates the valve body, the valve body has a first valve body and a second valve body that are arranged at an interval in the axial direction of the valve stem, and the area of ​​the flow path formed between the body and the valve body when viewed from the axial direction of the valve stem is larger than the area of ​​the flow path formed between the first valve body and the second valve body when viewed from the inlet flow path.

[0021] According to this aspect, the fluid that flows from the inlet flow path into the flow path formed between the first valve body portion and the second valve body portion of the valve body can smoothly flow out of the flow path formed between the body and the valve body, thereby reducing pressure loss of the fluid.

[0022] In the above aspect, it is preferable that the valve device is a device that is mounted in a flow path of cooling water for an electric vehicle.

[0023] According to this aspect, the valve device can suppress axial misalignment between the valve stem and the valve hole, reducing fluid leakage when the valve is fully closed, thereby enabling accurate control of the flow rate of cooling water. This allows cooling water to flow at the flow rate required by the electric vehicle. This improves the energy efficiency of the electric vehicle and contributes to carbon neutrality.

[0024] According to the valve device of the present disclosure, it is possible to suppress axial misalignment between the valve stem and the valve hole, thereby reducing fluid leakage in the fully closed state.

[0025] 13 is a diagram showing the valve device of the first embodiment (first valve open state, second seat and second valve fully closed state). FIG. 14 is a diagram showing the valve device of the first embodiment (second valve open state, first seat and first valve fully closed state). FIG. 15 is a diagram showing that the first seat and bobbin are integrally formed via a connecting portion. A cross-sectional view taken along line A-A of FIG. 3. FIG. 16 is a diagram showing an example of a mold used in the first embodiment. A cross-sectional view corresponding to FIG. 4 in the second embodiment. FIG. 17 is a diagram showing an example of a mold used in the second embodiment. A cross-sectional view corresponding to FIG. 4 in the first modified example of the second embodiment. A cross-sectional view corresponding to FIG. 4 in the second modified example of the second embodiment. An enlarged view of a spacer member and its periphery in the third embodiment. A cross-sectional view corresponding to FIG. 4 in the third embodiment. A cross-sectional view looking from the internal flow path to the first outflow flow path in the third embodiment. An enlarged view of a spacer member and its periphery in the fourth embodiment. A cross-sectional view taken along line B-B of FIG. 13. FIG. 16 is a diagram showing the valve device of the fifth embodiment (first valve open state, second seat and second valve fully closed state). A cross-sectional view taken along line C-C of FIG. 15. A cross-sectional view corresponding to line C-C of FIG. 15 showing dimensions. Fig. 10 is a diagram showing an example of a molding die used in a fifth embodiment. Fig. 11 is a diagram showing a modified example of the fifth embodiment. Fig. 12 is a diagram showing a valve in a sixth embodiment, viewed from the axial direction of the valve shaft (a diagram corresponding to the D-D cross-sectional view in Fig. 1). Fig. 13 is a diagram showing a valve in a sixth embodiment, viewed from an inlet flow path.

[0026] A valve device 1 according to an embodiment of the present disclosure will be described.

[0027] First Embodiment First, a first embodiment will be described.

[0028] (Overview of the Valve Device) An overview of the valve device 1 of this embodiment will be described. The valve device 1 is a device that is mounted in a coolant flow path of, for example, an electric vehicle (not shown) and controls the flow rate of the coolant. Note that "coolant" is an example of "fluid" or "liquid" in the present disclosure. Furthermore, an "electric vehicle" is, for example, a vehicle that is driven by power from a secondary battery as the drive source of the vehicle, such as an electric vehicle or a hybrid vehicle.

[0029] 1 and 2, the valve device 1 has a body 11 (i.e., a housing) having a flow path, a seat 12, a valve 13, a valve shaft 14, and an actuator 15. The seat 12 is an example of a "valve seat" in the present disclosure, the valve 13 is an example of a "valve body" in the present disclosure, and the valve shaft 14 is an example of a "valve stem" in the present disclosure.

[0030] The body 11 includes an internal flow passage 20 that houses the valve 13, one inlet flow passage 21, and two outlet flow passages 22. In this manner, the valve device 1 is a three-way valve.

[0031] The inflow passage 21 is a passage connected to the internal passage 20 and is a passage through which cooling water flows into the internal passage 20 .

[0032] The outlet flow path 22 is a flow path that discharges the cooling water from the internal flow path 20. The two outlet flow paths 22 are a first outlet flow path 221 and a second outlet flow path 222. The first outlet flow path 221 is provided on the actuator 15 side with respect to the internal flow path 20. The second outlet flow path 222 is provided on the opposite side of the internal flow path 20 from the actuator 15.

[0033] In this embodiment, the seat 12 includes a first seat 121 and a second seat 122. The first seat 121 is disposed on the first outlet flow path 221 side of the internal flow path 20. The second seat 122 is disposed on the second outlet flow path 222 side of the internal flow path 20. The first seat 121 and the second seat 122 are both formed in an annular shape and each have a valve hole 16 and a valve hole 17 in their centers.

[0034] The body 11 is made of resin. The seat 12 is made of resin, but may be made of rubber.

[0035] The valve 13 is attached to the valve shaft 14 and opens and closes the valve holes 16 and 17 by coming into contact with and separating from the seat 12. In this embodiment, the valve 13 includes a first valve 131 and a second valve 132 that are spaced apart in the axial direction of the valve shaft 14. A rubber seal 131a of the first valve 131 comes into contact with and separates from the first seat 121 on the internal flow path 20 side. A rubber seal 132a of the second valve 132 comes into contact with and separates from the second seat 122 on the internal flow path 20 side.

[0036] Although the valve 13 is made of resin, it may be made of metal. The first valve 131 is an example of a "first valve body" in the present disclosure, and the second valve 132 is an example of a "second valve body" in the present disclosure.

[0037] The valve shaft 14 is disposed inside the body 11. The valve shaft 14 is provided between the actuator 15 and the second valve 132. Although the valve shaft 14 is made of metal, it may also be made of resin.

[0038] In this embodiment, the valve 13 is attached to one axial end of the valve shaft 14. The valve shaft 14 is movable in a thrust direction, which is the axial direction of the valve shaft 14 (i.e., the central axis direction).

[0039] The actuator 15 is a driving unit that moves the valve shaft 14 in the axial direction of the valve shaft 14. In this embodiment, the actuator 15 includes a movable core 31, a fixed core 32, a bobbin 33, a coil 34, a casing 35, and the like.

[0040] The movable core 31 moves integrally with the valve shaft 14, thereby moving the valve shaft 14 in the axial direction (central axis direction) of the valve shaft 14. The fixed core 32 is disposed opposite the movable core 31 in the axial direction of the valve shaft 14.

[0041] The movable core 31 and the fixed core 32 are made of a magnetic material (e.g., metal). When a current flows through the coil 34 and a magnetic field is generated around the coil 34, the movable core 31 and the fixed core 32 are magnetized by the magnetic field. When the movable core 31 and the fixed core 32 are magnetized, the movable core 31 is attracted to the fixed core 32 by magnetic force, and the movable core 31 approaches the fixed core 32. When no current flows through the coil 34, the movable core 31 and the fixed core 32 are not magnetized, the movable core 31 is not attracted to the fixed core 32, and the movable core 31 does not approach the fixed core 32.

[0042] The bobbin 33 is formed in a cylindrical shape, and has the movable core 31 and the fixed core 32 provided inside and the coil 34 provided outside. The bobbin 33, the coil 34, etc. are molded with resin to cover them, forming a resin casing 35.

[0043] The valve device 1 having such a configuration can be switched between a first open state shown in FIG. 1 and a second open state shown in FIG. 2 by moving the valve shaft 14 in the axial direction of the valve shaft 14 using the actuator 15.

[0044] The "first open valve state" refers to a state in which the first seat 121 and the first valve 131 are fully open, and the second seat 122 and the second valve 132 are fully closed. The "second open valve state" refers to a state in which the first seat 121 and the first valve 131 are fully closed, and the second seat 122 and the second valve 132 are fully open. The "fully closed state" refers to a state in which the seat 12 and the valve 13 are in contact over the entire circumferential direction of the annular seat 12, sealing the gap between the seat 12 and the valve 13.

[0045] 1, the cooling water introduced from the inlet flow path 21 is discharged from the first outlet flow path 221. In addition, in the second open state shown in FIG. 2, the cooling water introduced from the inlet flow path 21 is discharged from the second outlet flow path 222.

[0046] (Explanation Regarding Integration of First Sheet and Bobbin) Next, the integration of the first sheet 121 and the bobbin 33 will be described. In this embodiment, as shown in Fig. 3 , the first sheet 121 and the bobbin 33 are integrally formed via a connecting portion 40. The first sheet 121 and the connecting portion 40 are housed in the body 11.

[0047] Since the first seat 121 and the bobbin 33 are integrally formed via the connecting portion 40 in this manner, the first seat 121 and the bobbin 33 are positioned properly. This prevents axial misalignment (i.e., misalignment of the central axes) between the valve hole 16 of the first seat 121 and the bobbin 33, thereby preventing axial misalignment between the valve hole 16 and the valve shaft 14 disposed inside the bobbin 33. This improves the centering accuracy (i.e., the accuracy with which the central axes coincide) between the first seat 121 and the first valve 131. Therefore, when the first seat 121 and the first valve 131 are fully closed (i.e., the second open state in FIG. 2 ), the gap between the first seat 121 and the first valve 131 is sealed, reducing leakage of coolant between the first seat 121 and the first valve 131.

[0048] The valve device 1 is a device mounted in the coolant flow path of an electric vehicle, and when the first seat 121 and the first valve 131 are fully closed, the valve device 1 can reduce coolant leakage between the first seat 121 and the first valve 131, thereby enabling precise control of the coolant flow rate. This allows the coolant to flow at the flow rate required by the electric vehicle. This improves the energy efficiency of the electric vehicle and contributes to carbon neutrality.

[0049] Furthermore, the first seat 121 and the bobbin 33 are formed as a single component, which reduces the number of components in the valve device 1 and the number of steps required to assemble the valve device 1. This reduces the manufacturing cost of the valve device 1.

[0050] Furthermore, the function for holding the first sheet 121 can be simplified. That is, if the first sheet 121 and the bobbin 33 are formed separately, a function for fixing the first sheet 121 so that it does not shift in position is required. Therefore, for example, in order to press-fit the first sheet 121 into the body 11, it is necessary to increase the thickness of the body 11 to ensure strength. In contrast, in this embodiment, the first sheet 121 and the bobbin 33 are formed integrally, and therefore the position of the first sheet 121 is less likely to shift, so a function for fixing the first sheet 121 so that it does not shift in position is not required. Therefore, for example, since it is not necessary to press-fit the first sheet 121 into the body 11, the thickness of the body 11 can be reduced. Therefore, the function for holding the first sheet 121 can be simplified.

[0051] 3 and 4, the connecting portion 40 is formed by four pillar portions 41. In the example shown in FIGS. 3 and 4, the pillar portions 41 are formed in a substantially rectangular parallelepiped shape. The number of the connecting portion 40 is not limited to four, and it is sufficient if the connecting portion 40 is formed by a plurality of pillar portions 41.

[0052] This simplifies the shape of the connecting portion 40. Therefore, the influence of the connecting portion 40 on the flow of the cooling water flowing through the valve device 1 can be reduced.

[0053] 4, in this embodiment, the four columnar portions 41 are arranged at equal intervals from one another in the circumferential direction of the annular first sheet 121. That is, the four columnar portions 41 are arranged at equal intervals of 90° in the circumferential direction of the first sheet 121. The columnar portions 41 have a substantially rectangular cross section and are arranged so that the long side direction coincides with the radial direction of the first sheet 121. An opening 42 is provided between adjacent columnar portions 41.

[0054] This increases the degree of freedom in the circumferential orientation of the connecting portion 40 and the first seat 121 of the bobbin 33. This improves the mountability of the valve device 1.

[0055] 5, two molds having the same shape, that is, a first mold 101 and a second mold 102, can be used as molds for forming the first sheet 121 and the connecting portion 40. This allows for a reduction in the cost of processing the first sheet 121 and the connecting portion 40.

[0056] Second Embodiment Next, a second embodiment will be described. Differences from the first embodiment will be described, and a description of commonalities with the first embodiment will be omitted.

[0057] In this embodiment, as shown in Fig. 6 , when the connecting portion 40 is viewed from the bobbin 33 side, the columnar portion 41 has a flat portion 43 that is parallel to the central axis CL of the opening 42. Note that in the example shown in Fig. 6 , the connecting portion 40 is formed by two columnar portions 41. Also, in Fig. 6 , the direction in which the cooling water flows from the valve hole 16 toward the first outflow passage 221 is shown as the "flow direction."

[0058] In this way, by providing the columnar portion 41 with the flat portion 43, the distance L2 between the two columnar portions 41 can be made larger than the distance L1 between two adjacent columnar portions 41 in Fig. 4, and the opening area of ​​the opening 42 can be made larger than that in Fig. 4. This reduces the pressure loss of the cooling water flowing through the opening 42, and therefore increases the flow rate of the cooling water that can flow through the valve device 1.

[0059] 6 can be formed using two identically shaped first and second molds 101 and 102, as shown in FIG. 7. This reduces the cost of processing the first sheet 121 and the connecting portion 40.

[0060] Furthermore, as a first modified example, as shown in FIG. 8, in the columnar portion 41, a flat portion 43 may be formed in the horizontal direction (i.e., the left-right direction in FIG. 8) and the vertical direction (i.e., the up-down direction in FIG. 8) starting from a point on a 45° line (the dashed line indicated as "45°" in FIG. 8).

[0061] As a second modified example, as shown in FIG. 9 , in the columnar portion 41, a flat portion 43 may be formed starting from a point on a 30° line (the dashed line indicated as “30°” in FIG. 9 ) along the horizontal direction (the left-right direction in FIG. 9 ) and along a direction inclined by 120° relative to the horizontal direction.

[0062] In these modified examples, the distance L2 between two adjacent columnar portions 41 can be made larger than the distance L1 between two adjacent columnar portions 41 in Fig. 4, and the opening area of ​​the opening 42 can be made larger than that in Fig. 4. This reduces the pressure loss of the cooling water flowing through the opening 42. This increases the flow rate of the cooling water that can flow through the valve device 1.

[0063] Furthermore, according to the first modified example, the degree of freedom in the circumferential direction orientation of the connecting portion 40 and the first seat 121 of the bobbin 33 can be ensured, similar to the first embodiment.

[0064] Furthermore, according to the second modified example, the distance L2 can be made larger than in the first modified example, and the opening area of ​​the opening 42 can be made larger than in Fig. 8. Therefore, the pressure loss of the cooling water flowing through the opening 42 can be further reduced.

[0065] Third Embodiment Next, a third embodiment will be described. Differences from the first and second embodiments will be described, and descriptions of commonalities with the first and second embodiments will be omitted.

[0066] 10 to 12, in this embodiment, a spacer member 50 that guides the direction in which the cooling water flows is provided in one of the four openings 42, i.e., the opening 42 that connects to the first outflow passage 221. This spacer member 50 is disposed on the first sheet 121, and the surface that comes into contact with the cooling water is formed in a curved shape from the outlet of the valve hole 16 to the inlet of the first outflow passage 221. Note that in FIGS. 10 to 12, the spacer member 50 is hatched with dots to more clearly show the spacer member 50.

[0067] By providing the spacer member 50 in this manner, the corner C1 on the valve hole 16 side of the first seat 121 and the corner C2 at the entrance of the first outflow passage 221 can be connected by a curved surface portion (i.e., the portion hatched with dots in FIG. 10 ) formed on the spacer member 50. This prevents pressure loss that occurs when the cooling water flows through the corner C1 and the corner C2.

[0068] When the cooling water flows through the opening 42, the spacer member 50 guides the flow direction toward the first outlet flow path 221. This prevents the cooling water from entering in any direction other than the first outlet flow path 221. This allows the cooling water to flow smoothly, reducing pressure loss of the cooling water.

[0069] The spacer member 50 is fixed to the columnar portion 41 by the first claw 51 and the second claw 52. The protruding amount of the second claw 52 is greater than the protruding amount of the first claw 51.

[0070] The spacer member 50 is adapted to swell when it comes into contact with cooling water.

[0071] Specifically, the material of the columnar portion 41 is, for example, PPS resin (i.e., polyphenylene sulfide), while the material of the spacer member 50 is, for example, a material that swells more easily when exposed to cooling water than the columnar portion 41, such as PA6 resin (i.e., polyamide 6 resin) or POM resin (i.e., polyacetal resin).

[0072] In this way, by utilizing the difference in swelling between the columnar portion 41 and the spacer member 50, i.e., by making the spacer member 50 swell more easily than the columnar portion 41, the spacer member 50 expands when it comes into contact with the cooling water as it flows through the opening 42, and the spacer member 50 can be tightly attached to the columnar portion 41. Therefore, the spacer member 50 can be fixed to the columnar portion 41 more firmly.

[0073] Moreover, since the spacer member 50 also swells on the inner wall 11a (i.e., side surface) side of the body 11, the spacer member 50 can be tightly attached to the inner wall 11a of the body 11. Furthermore, the second claws 52 swell and press against the columnar portion 41 and the inner wall 11a of the body 11, so that the spacer member 50 can be more firmly fixed to the columnar portion 41 and the body 11.

[0074] The spacer member 50 may be provided in the openings 42 other than the opening 42 connected to the first outflow channel 221, and may be provided in, for example, all four openings 42. In other words, it is sufficient that the spacer member 50 is provided in at least one of the four openings 42.

[0075] Fourth Embodiment Next, a fourth embodiment will be described. Differences from the first to third embodiments will be described, and descriptions of commonalities with the first to third embodiments will be omitted.

[0076] 13 and 14 , in addition to the spacer member 50, a spacer member 60 is provided. This spacer member 60 is provided so as to be disposed on the first sheet 121 at the opening 42 opposite the opening 42 at which the spacer member 50 is provided. The spacer member 60 has a curved portion so as to guide the cooling water to flow from the valve hole 16 toward the first outflow passage 221.

[0077] This allows the cooling water to flow smoothly as shown by the arrows in FIG. 13, eliminating stagnation in the flow of cooling water.

[0078] Like the spacer member 50, the spacer member 60 also swells when it comes into contact with the cooling water flowing through the opening 42. Therefore, like the material of the spacer member 50, the spacer member 60 is made of a material that is more likely to swell when it comes into contact with the cooling water than the columnar portion 41, such as PA6 resin or POM resin.

[0079] Similarly to the spacer member 50, the spacer member 60 is fixed to the columnar portion 41 by a first claw 61 and a second claw 62 (see FIG. 14).

[0080] It should be noted that the spacer member 50 may be provided in at least one of the two openings 42 where the spacer member 50 or the spacer member 60 is not provided.

[0081] Fifth Embodiment Next, a fifth embodiment will be described. Differences from the first to fourth embodiments will be described, and descriptions of commonalities with the first to fourth embodiments will be omitted.

[0082] In this embodiment, as shown in FIG. 15, the outer diameter D of the first sheet 121 is enlarged, and the dimension of the columnar portion 41 in the depth direction is reduced. As shown in FIG. 16, when the connecting portion 40 is viewed from the bobbin 33 side, a gap δ is formed between the columnar portion 41 and the inner wall 11a of the body 11, allowing cooling water to flow.

[0083] As a result, by flowing the cooling water through the gap δ as shown by the arrow in Fig. 16, it is possible to prevent the flow of cooling water from stagnating in the region α surrounded by the dashed line in Fig. 16. Therefore, the cooling water can flow smoothly from the valve hole 16 to the first outflow passage 221 on the downstream side, thereby reducing pressure loss of the cooling water.

[0084] In addition, since the outer diameter D of the first seat 121 is enlarged and the inner diameter of the body 11 is also enlarged, when assembling the actuator 15 with the valve 13 attached to the body 11, it becomes easier to insert the valve 13 into the body 11 without it hitting the inner wall 11a of the body 11.

[0085] 17, when the flow path area of ​​a region where the distance between two adjacent pillar portions 41 is indicated by L1 is SL1, the flow path area of ​​a region where the distance between the pillar portions 41 and the inner wall 11a of the body 11 is indicated by L3 is SL3, and the flow path area of ​​a region where the inner diameter of the first outflow passage 221 is indicated by L4 is SL4, the following equation is established: [Equation 1] SL4<(SL1+SL3+SL3)

[0086] In this way, by making the size of the flow passage larger on the upstream side of the flow of cooling water than on the downstream side, the cooling water can flow more smoothly downstream, thereby reducing pressure loss of the cooling water.

[0087] In this embodiment as well, as shown in FIG. 18, the first sheet 121 and the connecting portion 40 can be molded using two molds of the same shape, that is, a first mold 101 and a second mold 102.

[0088] 19, a flow path δa through which cooling water can flow may be formed between the valve hole 16 and the columnar portion 41. In this modification, the first sheet 121 and the connecting portion 40 can also be molded using two molds of the same shape, that is, a first molding die 101 and a second molding die 102, as shown in FIG.

[0089] Sixth Embodiment Next, a sixth embodiment will be described. Differences from the first to fifth embodiments will be described, and descriptions of commonalities with the first to fifth embodiments will be omitted.

[0090] In this embodiment, as shown in Figures 20 and 21, the area S2 of the flow path formed in the gap between the body 11 and the valve 13 when the valve 13 is viewed from the axial direction of the valve shaft 14 (the area of ​​the portion hatched with dots in Figure 20) is larger than the area S1 of the flow path formed between the first valve 131 and the second valve 132 when the valve 13 is viewed from the inlet flow path 21 (the area of ​​the portion hatched with dots in Figure 21).

[0091] As a result, the cooling water that has flowed from the inlet flow passage 21 into the flow passage formed between the first valve 131 and the second valve 132 can smoothly flow out into the first outlet flow passage 221 from the gap formed between the inner wall 11a of the body 11 and the valve 13. In this way, it is possible to reduce pressure loss of the cooling water at a position where the flow direction of the cooling water changes from the inlet flow passage 21 to a substantially right angle within the internal flow passage 20, and pressure loss of the cooling water is likely to occur.

[0092] It should be noted that the above-described embodiments are merely examples and do not limit the present disclosure in any way. It goes without saying that various improvements and modifications are possible within the scope of the gist of the present disclosure.

[0093] REFERENCE SIGNS LIST 1 valve device 11 body 12 seat 121 first seat 122 second seat 13 valve 131 first valve 132 second valve 14 valve shaft 15 actuator 16 valve hole 20 internal flow path 21 inlet flow path 22 outlet flow path 221 first outlet flow path 222 second outlet flow path 31 moving core 32 fixed core 33 bobbin 34 coil 40 connecting portion 41 columnar portion 42 opening 43 flat portion 50 spacer member 60 spacer member CL central axis (of opening) L1 distance (between adjacent columnar portions) L2 distance (between adjacent columnar portions) δ gap S1 area of ​​flow path S2 area of ​​flow path

Claims

1. A valve device comprising: a valve seat having a valve hole; a valve disc that opens and closes the valve hole by coming into contact with and moving away from the valve seat; a valve stem to which the valve disc is attached; a movable core that moves the valve stem in the axial direction of the valve stem; a fixed core that is positioned opposite the movable core in the axial direction of the valve stem; and a cylindrical bobbin on the inside of which are provided the movable core and the fixed core and on the outside of which is provided a coil; 2. The valve device according to claim 1, wherein the connecting portion is formed by a plurality of pillar-shaped portions.

3. A valve device according to claim 2, wherein the plurality of columnar portions are arranged at equal intervals from each other in the circumferential direction of the annular valve seat.

4. A valve device according to claim 2 or 3, wherein an opening is provided between adjacent columnar portions, and when the connecting portion is viewed from the bobbin side, the columnar portions have a flat portion parallel to the central axis of the opening.

5. A valve device according to claim 2 or 3, further comprising a body which houses the valve seat and the connecting part, and when the connecting part is viewed from the bobbin side, a gap through which a fluid can flow is formed between the columnar part and the body.

6. A valve device according to claim 2 or 3, wherein an opening is provided between adjacent columnar portions, and at least one of the multiple openings is provided with a spacer member for guiding the direction of fluid flow.

7. The valve device according to claim 6, wherein the fluid is a liquid, and the spacer member swells when it comes into contact with the liquid flowing through the opening.

8. A valve device according to claim 1 or 2, comprising: a body which houses the valve body; the body having an inlet passage connected to a portion which houses the valve body; the valve body having a first valve body and a second valve body which are arranged at a distance from each other in the axial direction of the valve stem; and the area of ​​the passage formed between the body and the valve body when the valve body is viewed from the axial direction of the valve stem is larger than the area of ​​the passage formed between the first valve body and the second valve body when the valve body is viewed from the inlet passage.

9. The valve device according to claim 1 or 2, characterized in that the valve device is a device to be mounted in a flow path of cooling water for an electric vehicle.

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