WO2020184031A1

WO2020184031A1 - Fluid control valve

Info

Publication number: WO2020184031A1
Application number: PCT/JP2020/005209
Authority: WO
Inventors: 秀哉栃原
Original assignee: 浜名湖電装株式会社
Priority date: 2019-03-14
Filing date: 2020-02-11
Publication date: 2020-09-17
Also published as: JP2020148288A; JP7107260B2

Abstract

This fluid control valve (5) comprises: a valve part support member (58) to which a valve part (57) is mounted; and a plunger (55) that drives the valve part support member (58) in the axial direction. The fluid control valve (5) comprises a yoke (56) that is fixedly installed and that forms a magnetic circuit with the plunger (55) when a current is passed therethrough. The fluid control valve (5) comprises parallel parts respectively provided to the plunger (55) and the yoke (56) in a manner such that a magnetic flux passes between the plunger (55) and the yoke (56), the parallel parts being formed so as to run along one another in a cross-sectional shape. In a closed-valve state, an upstream-side annular part (550) contacts an upstream-side first annular part (560). Further, in the closed-valve state, the plunger (55) contacts the valve part support member (58) and supports the valve part support member (58) in the axial direction.

Description

Fluid control valve

Cross-reference of related applications

This application is based on Patent Application No. 2019-47422 filed in Japan on March 14, 2019, and the contents of the basic application are incorporated by reference as a whole.

The disclosure in this specification relates to a fluid control valve.

Patent Document 1 discloses an on-off valve that permits and blocks the flow of fluid flowing out of the engine in the engine cooling circuit.

Japanese Patent No. 5811797

In the on-off valve of Patent Document 1, the valve body constitutes the valve portion and the plunger. In the case of an on-off valve in which the plunger and the valve portion are made of separate members, the axial position of the valve portion with respect to the valve seat may vary when the valve is closed. If the axial position of the valve portion varies, there is a concern that sufficient valve closing force cannot be obtained.

The purpose of the disclosure in this specification is to provide a fluid control valve capable of achieving stable magnetic attraction and valve closing force when the valve is closed.

The plurality of aspects disclosed in this specification employ different technical means in order to achieve their respective purposes. Further, the scope of claims and the reference numerals in parentheses described in this section are examples showing the correspondence with the specific means described in the embodiment described later as one embodiment, and limit the technical scope. is not.

One of the disclosed fluid control valves is a housing having an internal passage through which the working fluid flows, and an internal passage for switching between a valve open state that allows the flow of the working fluid and a valve closed state that blocks the flow of the working fluid. A valve part that opens and closes, a valve part support member to which the valve part is mounted or a part of the valve part, and a plunger that is a separate member from the valve part support member and drives the valve part support member in the axial direction. A coil part that generates a magnetic force that drives the plunger in the axial direction when energized to switch between the valve open state and the valve closed state, a yoke that is fixedly installed and forms a magnetic circuit together with the plunger when energized, and a plunger. The plunger and the yoke are provided so as to form a magnetic path through which magnetic flux passes between the yoke and the plunger, and are provided with parallel portions that face each other and have a cross-sectional shape that follows each other, and are parallel portions in a valve closed state. The plunger parallel portion on one side contacts the yoke parallel portion on the other side of the parallel portion or through inclusions to form a magnetic path, and the plunger contacts the valve support member axially or Indirect contact through inclusions.

According to this fluid control valve, the axial position of the plunger and the yoke can be maintained in an appropriate state by directly or indirectly contacting the plunger parallel portion with the yoke parallel portion in the closed state. In the valve closed state, the plunger further contacts the valve support member in the axial direction or indirectly through inclusions. Therefore, the axial position of the valve portion can be maintained in an appropriate state with reference to the yoke parallel portion. From the above, it is possible to provide a fluid control valve capable of achieving stable magnetic attraction and valve closing force when the valve is closed.

It is a block diagram which shows the cooling water circuit which concerns on 1st Embodiment. It is sectional drawing which showed the valve open state about the fluid control valve. It is sectional drawing which showed the closed state about the fluid control valve. It is an enlarged view explaining the magnetic path between a yoke and a plunger in the valve open state. It is an enlarged view explaining the magnetic path between a yoke and a plunger in a valve closed state. It is a characteristic figure which shows the relationship between the stroke and the suction force about the 1st path and the 2nd path. It is a figure explaining the magnetic path between a yoke and a plunger in the valve open state about the fluid control valve of 2nd Embodiment. It is an enlarged view explaining the magnetic path between a yoke and a plunger in a valve closed state. It is a figure explaining the magnetic path between a yoke and a plunger in a valve open state about the fluid control valve of 3rd Embodiment. It is an enlarged view explaining the magnetic path between a yoke and a plunger in a valve closed state. It is a figure explaining the magnetic path between a yoke and a plunger in a valve open state about the fluid control valve of 4th Embodiment. It is an enlarged view explaining the magnetic path between a yoke and a plunger in a valve closed state. It is a figure explaining the magnetic path between a yoke and a plunger in a valve open state about the fluid control valve of 5th Embodiment. It is an enlarged view explaining the magnetic path between a yoke and a plunger in a valve closed state. It is a figure explaining the magnetic path between a yoke and a plunger in a valve open state about the fluid control valve of 6th Embodiment. It is an enlarged view explaining the magnetic path between a yoke and a plunger in a valve closed state. It is a figure explaining the magnetic path between a yoke and a plunger in a valve open state about the fluid control valve of 7th Embodiment. It is an enlarged view explaining the magnetic path between a yoke and a plunger in a valve closed state.

Hereinafter, a plurality of forms for carrying out the present disclosure will be described with reference to the drawings. In each form, the same reference numerals may be attached to the parts corresponding to the items described in the preceding forms, and duplicate description may be omitted. When only a part of the configuration is described in each form, the other forms described above can be applied to the other parts of the configuration. Not only the combinations of the parts that clearly indicate that they can be combined in each embodiment, but also the parts of the embodiments that are not explicitly combined unless there is a problem in the combination. It is also possible.

First Embodiment A first embodiment that discloses an example of a fluid control valve will be described with reference to FIGS. 1 to 6. The fluid control valve 5 of the first embodiment is installed in the cooling water circuit 1. The working fluid controlled by the fluid control valve 5 is, for example, a liquid such as gas, water, or oil. The cooling water circuit 1 shown as an example is a circuit in which engine cooling water circulates. The cooling water circuit 1 has a function of efficiently warming and cooling the engine 2 provided in the vehicle. The cooling water circuit 1 includes an engine 2, a pump 3, a first flow path 10, a second flow path 11, a third flow path 12, a switching valve 4, a heater core 6, a fluid control valve 5, a radiator 7, a control device 8, and the like. I have.

As shown in FIG. 1, the cooling water flows out from the pump 3, flows through the engine 2, the first flow path 10, the second flow path 11, and the third flow path 12, and returns to the pump 3. The control device 8 has at least one arithmetic processing unit and at least one memory device as a storage medium for storing programs and data. The control device 8 is provided by, for example, a microcomputer having a storage medium readable by a computer. A storage medium is a non-transitional substantive storage medium that stores a computer-readable program non-temporarily. The storage medium may be provided by a semiconductor memory, a magnetic disk, or the like. The control device 8 may be provided by one computer, or a set of computer resources linked by a data communication device. The program is executed by the control device 8 to cause the control device 8 to function as the device described in this specification. The program, when executed by the controller 8, causes the controller 8 to perform the methods described herein. In the control device 8, functional units for performing various processes for warming up and cooling the engine 2 are constructed by hardware, software, or both.

The pump 3 is a device that works with the operation of the engine 2 so as to drive the cooling water when the engine 2 is in the operating state. The pump 3 operates when the engine 2 is in the operating state to circulate the cooling water, and does not operate when the engine 2 is in the stopped state. As the pump 3, for example, a mechanical variable flow rate pump that operates by rotating an engine is used. The pump 3 may be a device that uses an electric motor as a drive source and can operate and stop regardless of the operating state of the engine 2. In this case, the pump 3 can change the amount of the fluid to be discharged by the control of the control device 8.

The first flow path 10 is a flow path through which the fluid flowing out of the engine 2 flows into the engine 2 via the pump 3. The first flow path 10 is a flow path in which the fluid circulates through the engine 2, the switching valve 4, and the pump 3 without passing through the heater core 6 and the radiator 7. A flow path for circulating cooling water is formed inside the engine 2. The cooling water circulating inside the engine 2 absorbs the heat of the engine 2 to raise its own temperature, thereby lowering the internal temperature of the engine 2. The second flow path 11 is a flow in which the cooling water flowing out of the engine 2 is branched from the upstream portion of the first flow path 10 and returned to the downstream portion of the first flow path 10 via the fluid control valve 5 and the heater core 6. It's a road. A fluid control valve 5 and a heater core 6 are provided in the second flow path 11. The third flow path 12 is a flow path that branches from the upstream portion of the second flow path 11 that is on the upstream side of the fluid control valve 5 and returns to the downstream portion of the first flow path 10 via the radiator 7. ..

A radiator 7 is provided in the third flow path 12. A switching valve 4 is provided at a confluence portion where the third flow path 12 is connected to the first flow path 10 on the downstream side. The switching valve 4 is configured so that the flow path of the cooling water flowing out of the engine 2 can be switched between the first state and the second state. The first state is a state in which the first flow path 10 and the third flow path 12 are not communicated with each other so that the cooling water circulates in the first flow path 10. The second state is a state in which all three passages connected by the switching valve 4 are opened. The switching valve 4 is, for example, a device that switches the flow path to the second state when the cooling water satisfies a predetermined temperature condition, and switches the flow path to the first state when the predetermined temperature condition is not satisfied. The switching valve 4 can be configured by, for example, a thermostat valve. The valve opening degree of the switching valve 4 changes according to the amount of heat applied to the temperature-sensitive wax or the cooling water temperature.

The fluid control valve 5 is provided on the upstream side or the downstream side of the heater core 6 in the second flow path 11, and its opening degree can be switched between two states, a valve closed state and a valve open state. When the fluid control valve 5 is in the closed state, the cooling water does not flow to the second flow path 11 in the first state but flows only to the first flow path 10. When the fluid control valve 5 is in the valve open state, the cooling water flows in both the first flow path 10 and the second flow path 11 in the first state. As described above, the second flow path 11 and the third flow path 12 are configured in parallel with the first flow path 10.

The control device 8 controls the fluid control valve 5 based on the temperature of the cooling water detected by the cooling water temperature sensor. After the engine 2 is started, if the cooling water temperature is lower than the predetermined first temperature, the switching valve 4 maintains the first state, and the control device 8 controls the fluid control valve 5 to the closed state. Since the cooling water circulates only in the first flow path 10, warming up of the engine 2 is promoted.

When the cooling water temperature exceeds the first temperature, the warm-up control of the engine 2 is terminated. When the cooling water temperature becomes higher than the second temperature set to be higher than the first temperature, the switching valve 4 switches to the second state. The cooling water circulates in the third flow path 12, and the cooling water is dissipated in the radiator 7. When the energization is cut off by the control device 8 and the fluid control valve 5 is controlled to the valve open state, the cooling water circulates in the second flow path 11, and the cooling water is also dissipated in the heater core 6. Further, in the first state, when heat dissipation from the cooling water is required in the heater core 6, the control device 8 may cut off the energization to control the fluid control valve 5 to the valve open state.

As another form, the cooling water circuit 1 described above may have only a path in which the fluid flowing out from the engine 2 returns to the engine via the heater core 6 and the radiator 7. That is, the cooling water circuit 1 may not have the first flow path 10. The control device 8 may be configured to control the fluid control valve 5 based on the detection value of the engine oil temperature or the oil temperature of a transmission or the like.

The fluid control valve 5 will be described with reference to FIGS. 2 to 6. FIG. 2 shows the valve open state, and FIG. 3 shows the valve closed state. The fluid control valve 5 includes a valve seat 511 which is a seat valve, a valve portion 57, a valve portion support member 58, a plunger 55 which is a movable core, an electromagnetic solenoid portion 54 and the like. The fluid control valve 5 is a solenoid valve device having a configuration in which the pressure of the working fluid acts in the valve opening direction in which the valve portion 57 is separated from the valve seat 511. That is, the fluid control valve 5 is a solenoid valve device in which the valve closing direction of the valve portion 57 is set in a direction that opposes the fluid pressure. The fluid control valve 5 opens and closes an internal passage 512 provided in the housing according to the magnitude relationship between the fluid pressure received from the working fluid and the magnetic force generated by energization. The fluid control valve 5 is a device that switches between a valve opening state in which the fluid passage is opened and a valve closed state in which the fluid passage is closed, with the direction opposite to the pressure acting direction of the working fluid flowing inside as the valve closing direction.

The valve portion support member 58 and the plunger 55 are separate members. The valve portion support member 58 and the plunger 55 are not fixed to each other. The plunger 55 supports the valve portion support member 58 in the axial direction. This means that the plunger 55 supports the valve portion support member 58 by applying a pushing force in the axial direction.

The plunger 55 includes a tubular portion 551 with both ends open in the axial direction. The plunger 55 includes an upstream annular portion 550 provided at one end of the tubular portion 551 on the valve portion 57 side, and a downstream annular portion 552 provided at the other end of the tubular portion 551. .. The upstream annular portion 550 has the same diameter dimension as the tubular portion 551, and has an upstream opening 550a coaxial with the tubular portion 551 as a through hole. The upstream annular portion 550 contacts the downstream end of the valve support member 58 and supports the valve support member 58 so as to be displaced in the axial direction. The axial direction is also the moving direction of the valve portion 57. As a result, the valve portion support member 58 is displaced in the axial direction together with the plunger 55.

The upstream annular portion 550 may be configured to support the valve portion support member 58 in the axial direction in a form that does not directly contact the valve portion support member 58. In this case, the upstream annular portion 550 is indirectly in contact with the valve portion support member 58 via inclusions. The inclusions are non-magnetic or magnetic. Further, the upstream annular portion 550 and the valve portion support member 58 may be configured so that they do not come into contact with each other in the process of the valve opening state and the valve closing state. In this case, the upstream annular portion 550 and the valve portion support member 58 shift from a separated state to a state of direct or indirect contact in the valve closed state. The upstream annular portion 550 is configured to support the valve portion support member 58 at least in the valve closed state.

The downstream annular portion 552 is a flange-shaped portion having a diameter larger than that of the tubular portion 551 and extending radially in a direction orthogonal to the tubular portion 551. The downstream annular portion 552 is provided with a downstream opening that is coaxial with the tubular portion 551 on the inside. A fluid passage 553 is provided inside the tubular portion 551. The fluid passage 553 has an upstream opening 550a as a fluid inflow port. The plunger 55 is made of a material that conducts magnetism, for example, a magnetic material.

The valve portion support member 58 is integrally formed with the valve portion 57 by connecting the valve portion 57. The valve portion support member 58 includes an upstream side tubular portion 582, an upstream side plate portion 580, and a downstream side tubular portion 583. The upstream side plate portion 580 is a disk-shaped portion integrally provided at the upstream end portion of the upstream side tubular portion 582. A valve portion 57 is attached to the upstream side plate portion 580. The upstream tubular portion 582 is provided with a fluid passage 581 that penetrates in the radial direction. At least one fluid passage 581 is provided in the upstream tubular portion 582. The fluid passage 581 communicates with the internal passage 512 on the upstream side and communicates with the fluid passage 553 on the downstream side via the upstream opening 550a.

The downstream tubular portion 583 is integrally provided at the downstream end of the upstream tubular portion 582, and has a smaller diameter than the upstream tubular portion 582. The downstream tubular portion 583 is slidably supported in the axial direction in a state of being inserted into the opening 560a provided in the upstream first annular portion 560 of the yoke 56. The valve portion support member 58 is regulated to be further displaced in the valve opening direction by contacting the downstream end of the upstream tubular portion 582 with the upstream first annular portion 560 in the valve open state. .. Therefore, the downstream tubular portion 583 can be displaced within a predetermined range in the axial direction by the yoke 56, and is restricted to be substantially immovable in the radial direction. The valve portion support member 58 is made of a material such as a resin material that does not easily conduct magnetism. Therefore, the valve portion support member 58 is configured so as not to form a magnetic circuit.

The valve portion 57 is made of an elastically deformable material such as rubber. The valve portion 57 is integrally attached to the valve portion support member 58 in a state where the shaft portion extending downstream in the axial direction is fitted in the through hole of the upstream side plate portion 580. The valve portion 57 is provided at a position axially opposed to the valve seat 511 provided in the inflow side housing 51.

The fluid control valve 5 includes a housing body that forms an internal passage 512 for the working fluid. The housing body includes an inflow side housing 51, an outflow side housing 53, and an intermediate housing 52 that connects the inflow side housing 51 and the outflow side housing 53. The inflow side housing 51 is provided with an inflow port 510 into which the working fluid flows. The downstream side of the inflow side housing 51 is integrally provided with the intermediate housing 52, and contains a valve portion 57, most of the valve portion support member 58, and the like. The inflow side housing 51 includes a valve seat 511 in which a valve portion 57 displaced in the valve closing direction is seated around the inflow port 510. In the valve closed state, the valve seat 511 is in contact with the valve portion 57 so as to form an annular surface or an annular wire.

The outflow side housing 53 is provided with an output port 530. The upstream side of the outflow side housing 53 is integrally provided with the intermediate housing 52. The output port 530 communicates with the fluid passage 553 at the upstream end. The inflow side housing 51, the intermediate housing 52, and the outflow side housing 53 are made of a resin material and are welded together.

The intermediate housing 52 contains a yoke 56, a plunger 55, a coil portion 540, a bobbin 541, a sliding support member 542, and the like. The yoke 56 is fixedly installed in the housing of the fluid control valve 5. The yoke 56 is made of a material that conducts magnetism, for example, a magnetic material. The yoke 56 forms a part of the magnetic circuit, and the bobbin 541 and the sliding support member 542 are supported inside the intermediate housing 52. The yoke 56 is provided so as to cover the outer peripheral side of the bobbin 541 and the coil portion 540. The plunger 55, the coil portion 540, the bobbin 541, the sliding support member 542, the valve portion support member 58, and the valve portion 57 are installed so that their axes are coaxial.

The sliding support member 542 is a tubular body. The sliding support member 542 supports the bobbin 541 on the outside and the outer surface of the tubular portion 551 of the plunger 55 on the inside so that the plunger 55 can slide in the axial direction. The sliding support member 542 is made of a non-magnetic material that does not easily allow magnetic flux to pass through.

The electromagnetic solenoid unit 54 includes a yoke 56, a coil unit 540, a bobbin 541, a sliding support member 542, a connector, and the like. The connector is provided so as to be located on the side or outside of the yoke 56. The connector is provided to energize the coil portion 540. The terminal terminal inside the connector is electrically connected to the coil portion 540. The electromagnetic solenoid unit 54 can control the current energized in the coil unit 540 by electrically connecting the terminal terminal to a current control device or the like with a connector. The bobbin 541 is formed of a resin material in a cylindrical shape, and a coil portion 540 is wound around the outer peripheral surface. The coil unit 540 generates a magnetic force that drives the plunger 55 in the axial direction when energized in order to switch between the valve open state and the valve closed state.

The yoke 56 is a tubular body with both ends open in the axial direction. The yoke 56 includes an upstream first annular portion 560, an inclined portion 561, an upstream second annular portion 562, and a downstream tubular portion 563. The upstream first annular portion 560 is provided at one end of the yoke 56 on the valve portion 57 side. The upstream first annular portion 560 is provided so as to be in axial contact with the upstream annular portion 550 of the plunger 55. The upstream first annular portion 560 has an opening 560a having a diameter larger than that of the upstream annular portion 550 and coaxial with the upstream opening 550a of the plunger 55 as a through hole.

The upstream first annular portion 560 and the upstream annular portion 550 are parallel portions that face each other in the axial direction and have a cross-sectional shape that follows each other. Hereinafter, the cross-sectional shape related to the inclined portion and the parallel portion is a vertical cross-sectional shape along the axial direction of the plunger or the like. The upstream first annular portion 560 and the upstream annular portion 550 are provided on the plunger 55 and the yoke 56 so as to form a magnetic path through which the magnetic flux passes between the plunger 55 and the yoke 56.

The upstream first annular portion 560 is provided so that the downstream side surface 560b opposite to the valve portion 57 contacts the upstream side surface 550b located on the valve portion 57 side of the upstream annular portion 550 in a closed state. The valve closed state is a state in which the internal passage 512 is closed so as to block the flow of the working fluid. The valve closed state includes not only a state in which the valve portion 57 and the valve seat 511 are in contact with each other, but also a state in which the valve portion 57 and the valve seat 511 are not in contact with each other but are blocking the flow of the working fluid.

The downstream side surface 560b and the upstream side surface 550b are portions facing each other in the axial direction and form parallel portions along each other. As shown in FIGS. 3 and 5, in the valve closed state, a magnetic path, which is a second path through which magnetic flux passes, is formed in a portion where the upstream first annular portion 560 and the upstream annular portion 550 come into contact with each other. The upstream annular portion 550 corresponds to a plunger parallel portion that is one of the parallel portions in the valve closed state. The upstream first annular portion 560 corresponds to the yoke parallel portion which is the other of the parallel portions in the valve closed state. The upstream first annular portion 560 and the upstream annular portion 550 are portions that face each other in the axial direction and are orthogonal to the axial direction. The upstream annular portion 550 is a movable upstream annular portion that extends so as to intersect the tubular portion 551 and is provided on the plunger 55 on the upstream side of the working fluid with respect to the tubular portion 551. The upstream-side first annular portion 560 is a fixed-side upstream annular portion provided on the yoke 56 on the upstream side of the working fluid with respect to the movable-side upstream annular portion.

The upstream side annular portion 550 and the upstream side first annular portion 560 may be configured so as not to come into direct contact with each other in the valve closed state. In this case, the upstream annular portion 550 is indirectly in contact with the upstream first annular portion 560 via the inclusions so as to form a magnetic path through the inclusions. The inclusions are, for example, non-magnetic or magnetic. The inclusions are objects through which magnetic flux passes between the upstream annular portion 550 and the upstream first annular portion 560 in the valve closed state.

The inclined portion 561 is a tubular portion having a shape in which the end portion on the valve portion 57 side is connected to the upstream side first annular portion 560 and the end portion on the plunger 55 side is connected to the upstream side second annular portion 562. The inclined portion 561 is a tubular portion whose diameter increases from the upstream side to the downstream side. The inclined portion 561 is a portion having a cross-sectional shape that is inclined with respect to the tubular portion 551 of the plunger 55. The inclined portion 561 is formed so that the upstream end portion has a smaller diameter dimension than the downstream end portion. Therefore, the inclined portion 561 is inclined with respect to the tubular portion 551 so that the diameter becomes larger toward the downstream side or the plunger 55 side.

The end of the inclined portion 561 on the upstream side or the valve portion 57 side has a larger diameter than the tubular portion 551. The tubular portion 551, particularly the upstream portion thereof, is provided so that the distance from the inclined portion 561 gradually decreases as the valve is moved from the valve open state to the valve closed state. When energization is started in the valve open state, as shown in FIG. 2, the distance between the plunger 55 and the yoke 56 on the upstream side is the shortest between the inclined portion 561 and the tubular portion 551. As described above, in the valve open state, the magnetic flux, which is the first path through which the magnetic flux passes between the inclined portion 561 and the tubular portion 551, becomes larger than that of the above-mentioned second path. When energization is started in the valve open state, the first path forms a magnetic path with a larger magnetic flux than the second path, and in the valve closed state, the second path forms a magnetic path with a larger magnetic flux than the first path. To do.

The upstream second annular portion 562 extends radially from the downstream end of the inclined portion 561 in the yoke 56. The downstream tubular portion 563 extends axially from the outer peripheral edge of the upstream second annular portion 562 in the yoke 56. The upstream second annular portion 562 is a flange-shaped portion having a diameter larger than that of the downstream end of the inclined portion 561 and extending radially in a direction orthogonal to the downstream tubular portion 563. The upstream side second annular portion 562 has a cross-sectional shape parallel to the upstream side first annular portion 560. The inner peripheral surface of the downstream tubular portion 563 is in a positional relationship facing the outer peripheral edge of the downstream annular portion 552 in the axial direction in the valve closed state and the valve open state. When energized, a magnetic path through which magnetic flux passes is also formed between the downstream tubular portion 563 and the outer peripheral edge of the downstream annular portion 552.

As shown in FIG. 6, the suction force for sucking the plunger 55 is larger in the first path than in the second path from the valve open state to the valve closed state. Further, this suction force has a characteristic that a reversal phenomenon occurs immediately before the valve closed state and the second path is larger than the first path in the valve closed state. As shown in FIG. 4, in the valve open state when energized, the first path indicated by the solid line arrow becomes the dominant magnetic path than the second path indicated by the broken line arrow. This is because the inclined portion 561 and the tubular portion 551 are the shortest distances between the plunger 55 and the yoke 56, the portions having the minimum magnetic resistance, and the portions having the maximum magnetic flux. Therefore, in the fluid control valve 5, the suction force for sucking the plunger 55 in the valve open state where the stroke is large is larger in the first path than in the second path, as in the characteristic diagram of FIG. By adopting a configuration in which the fluid control valve 5 starts suction in the first path, the plunger 55 can be sucked against the fluid pressure acting on the valve portion 57. Therefore, the fluid control valve 5 can enhance the suction performance at the start of energization.

When the valve open state shown in FIG. 4 approaches the valve closed state and the valve closed state shown in FIG. 5 is reached, a reversal phenomenon occurs in which the second path becomes more dominant than the first path. This is because the upstream annular portion 550 and the upstream first annular portion 560 forming parallel portions are in contact with each other or are closest to each other between the plunger 55 and the yoke 56. Therefore, the portion between the upstream side annular portion 550 and the upstream side first annular portion 560 is the portion having the smallest magnetic resistance and the portion having the largest magnetic flux. Similar to the characteristic diagram of FIG. 6, the fluid control valve 5 changes so that the suction force of the plunger 55 becomes larger in the second path immediately before the valve closed state in which the stroke is small. The fluid control valve 5 can shut off the valve portion 57 against the fluid pressure acting on the valve portion 57 by adopting a configuration in which the valve portion 57 is attracted to the valve seat 511 by the second path. Therefore, the suction holding force at the time of valve closing can be strengthened. As described above, the fluid control valve 5 provides a solenoid valve having advantageous characteristics related to the attractive force of both the first path and the second path shown in FIG.

Next, the action and effect brought about by the fluid control valve 5 of the first embodiment will be described. The fluid control valve 5 includes a valve portion support member 58 to which the valve portion 57 is mounted or a part of the valve portion 57, and a plunger 55 that drives the valve portion support member 58 in the axial direction. The fluid control valve 5 includes a coil portion 540 that generates a magnetic force, and a yoke 56 that is fixedly installed and forms a magnetic circuit together with a plunger 55 when energized. The fluid control valve 5 is provided on the plunger 55 and the yoke 56 so as to form a magnetic path through which magnetic flux passes between the plunger 55 and the yoke 56, and includes parallel portions having a cross-sectional shape along each other. In the valve closed state, the plunger parallel portion, which is one of the parallel portions, contacts the yoke parallel portion, which is the other of the parallel portions, or contacts via inclusions so as to form a magnetic path. In the valve closed state, the plunger 55 further contacts the valve portion support member 58 in the axial direction or indirectly via an inclusion.

According to this fluid control valve 5, the plunger parallel portion directly or indirectly contacts the yoke parallel portion in the closed state. Therefore, the axial positions of the plunger 55 and the yoke 56 can be maintained in an appropriate state. In the valve closed state, the plunger 55 further supports the valve portion support member 58 in the axial direction. Therefore, the axial position of the valve portion 57 can be maintained in an appropriate state with reference to the yoke parallel portion. From the above, it is possible to provide the fluid control valve 5 capable of achieving stable magnetic attraction and valve closing force when the valve is closed.

In a state where the fluid pressure does not act on the valve portion 57 in the valve opening direction, the valve portion 57 contacts the valve seat 511, and then the plunger parallel portion contacts the yoke parallel portion or indirectly via an inclusion. The valve is closed. According to this configuration, the axial positions of the plunger 55 and the yoke 56 can be maintained in an appropriate state when the valve portion 57 is in contact with the valve seat 511. The fluid control valve 5 can maintain a closed state while exerting a magnetic attraction force.

The valve portion 57 and the valve seat 511 are in close contact with each other in the closed state. In the valve closed state, the plunger parallel portion contacts the yoke parallel portion or indirectly so as to form a magnetic path through inclusions. In the valve closed state, the plunger 55 is in axial contact with the valve support member 58 or indirectly in contact with an inclusion.

According to this configuration, the valve portion 57 can be brought into close contact with the valve seat 511 in a state where the suction holding force of the plunger and the yoke can be secured and the axial position of the valve portion 57 can be properly maintained. The fluid control valve 5 can exert a stable magnetic attraction force and valve closing force when the valve is closed.

In the valve closed state, the valve portion support member 58 is axially supported by the plunger parallel portion. According to this configuration, the valve portion support member 58 can be supported by the plunger parallel portion in a state of being attracted to the yoke parallel portion. Therefore, the supporting force for supporting the valve portion support member 58 can be strengthened, and the function of maintaining the axial position of the valve portion 57 when the valve is closed can be enhanced.

The plunger parallel portion is in contact with the yoke parallel portion and the valve portion support member 58 on the same surface. According to this configuration, it is possible to provide the fluid control valve 5 that maintains the axial position of the valve portion in an appropriate state with reference to the surface of the plunger parallel portion.

The plunger parallel portion extends so as to intersect the tubular portion 551 and includes a movable upstream annular portion on the upstream side of the working fluid with respect to the tubular portion 551. The yoke parallel portion includes a fixed-side upstream annular portion on the upstream side of the working fluid with respect to the movable-side upstream annular portion. According to this configuration, the movable upstream annular portion directly or indirectly contacts the fixed upstream annular portion in the valve closed state. Therefore, since the mechanism portion for strengthening the suction holding force of the plunger 55 and the yoke 56 can be installed at a position close to the valve portion 57, it is possible to provide a magnetic attraction force that easily affects the valve closing force.

The yoke parallel part and the plunger parallel part are parts that face each other in the axial direction and are orthogonal to the axial direction. According to this configuration, since the magnetic attraction force can be applied in the direction perpendicular to the parallel portion, it is possible to provide the fluid control valve 5 capable of enhancing the attraction force.

The fluid control valve 5 includes a valve portion 57 in which the internal passage 512 is opened and closed so as to switch between the valve open state and the valve closed state, and the pressure of the working fluid acts in the valve opening direction. The fluid control valve 5 includes a first path, which is a magnetic path through which magnetic flux passes between the plunger 55 and the yoke 56. The fluid control valve 5 includes a second path, which is a magnetic path through which magnetic flux passes between the plunger 55 and the yoke 56 at a portion different from the first path. When energization is started in the valve open state, the first path forms a magnetic path in which the magnetic flux is larger than that of the second path. When the valve is closed, the second path forms a magnetic path in which the magnetic flux is larger than that of the first path.

According to the fluid control valve 5, at the start of energization in the valve open state, the plunger 55 can start sucking against the fluid pressure by utilizing the driving force generated by the magnetic path passing through the first path. Further, the plunger 55 can be attracted so as to maintain the valve closed state by utilizing the driving force generated by the magnetic path passing through the second path in the process of the valve portion 57 from the valve opened state to the valve closed state. The magnetic path passing through the first path becomes dominant when energization is started in the valve open state. As a result, it is possible to obtain a driving force for moving the valve portion 57 in the valve closing direction against the pressure of the working fluid by exerting a suction force for sucking the plunger 55 toward the valve seat 511 side. Since the valve can be brought to the closed state while the fluid pressure is acting on the valve portion 57, the fluid control valve 5 whose energization timing is not limited can be provided.

In the closed state, the magnetic path passing through the second path becomes dominant. As a result, the internal passage 512 can be closed by exerting an attractive force that keeps the valve portion 57 in contact with the valve seat 511. Due to this effect, it is possible to perform the valve closing operation from the valve opening state and the maintenance of the valve closing state without relying on the urging force such as a spring. Therefore, it is possible to suppress the increase in size of the device due to the provision of the spring and the strengthening of the urging force. From the above, it is possible to provide the fluid control valve 5 that can improve the valve closing performance and suppress the increase in size when the valve is closed against the pressure of the working fluid.

The first path is a part of one of the plunger 55 and the yoke 56, and magnetic flux passes between the inclined portion 561 and the other portion having a cross-sectional shape inclined with respect to the other portion of the plunger 55 and the yoke 56. It is a magnetic path. The second path is a magnetic path through which magnetic flux passes through parallel portions of the plunger 55 and the yoke 56 that face each other in the axial direction and have a cross-sectional shape that follows each other. This parallel portion is composed of an upstream annular portion 550 of the plunger 55 and an upstream first annular portion 560 of the yoke 56.

According to this configuration, since the inclined portion 561 is provided, it is possible to form a first path having a larger magnetic flux than the second path passing through the parallel portion of the plunger 55 and the yoke 56 at the start of energization in the valve open state. In the process from the valve open state to the valve closed state, it is possible to switch to the second path in which the overlapping area or contact area between the plunger 55 and the yoke 56 is large and the magnetic flux is large depending on the parallel portion. In this way, the shape of the plunger 55 and the yoke 56 is devised to construct the magnetic path. Thereby, it is possible to provide the fluid control valve 5 capable of performing the valve closing operation from the valve opening state and the maintenance of the valve closing state without relying on the urging force such as a spring.

According to the fluid control valve 5, the plunger 55 includes a tubular portion 551 extending in the axial direction. The yoke 56 includes an inclined portion 561 having a cross-sectional shape that is inclined with respect to the tubular portion 551. The parallel portion includes an upstream side annular portion 550 provided on the upstream side of the tubular portion 551 and an upstream side first annular portion 560 provided on the upstream side of the working fluid with respect to the inclined portion 561. According to this, since the inclined portion 561 with respect to the tubular portion 551 is provided on the yoke 56, the inner diameter of the tubular portion 551 can be increased. Therefore, when a configuration in which the fluid passage 553 is provided inside the tubular portion 551 is adopted, the fluid control valve 5 capable of suppressing the flow resistance of the working fluid can be provided.

The fluid control valve 5 includes a fluid passage 553 through which the working fluid flows inside the plunger 55. According to this configuration, it is possible to provide the fluid control valve 5 in which the heat generated from the plunger 55 due to energization can be alleviated by the working fluid.

The fluid control valve 5 includes a fluid passage 553 inside the coil portion 540 and inside the plunger 55 through which the working fluid flows. According to this configuration, it is possible to provide the fluid control valve 5 in which the heat generated from the coil portion 540 and the plunger 55 due to energization can be alleviated by the working fluid.

The second path is formed at a portion where the plunger 55 and the yoke 56 come into contact with each other in the valve closed state. According to this, the fluid control valve 5 can provide an attractive force that closes the valve portion 57 against the fluid pressure acting on the valve portion 57, and can enhance the adsorption holding force when the valve is closed.

Since the fluid control valve 5 forms a magnetic circuit with the plunger 55 and the yoke 56, it contributes to suppressing the number of parts of the device and further suppresses the air gap in the magnetic circuit.

The fluid control valve 5 may be controlled to a maximum voltage at the start of energization (at the start of suction) in the valve open state, and may be controlled to a voltage smaller than that at the start of suction at the time of holding the suction in the closed state. .. When this control is adopted, the above-mentioned first path and second path are formed. Thereby, it is possible to provide the fluid control valve 5 that can satisfy the suction start and the suction holding even if the energization voltage is suppressed.

Second Embodiment The second embodiment will be described with reference to FIGS. 7 and 8. The fluid control valve 5 of the second embodiment is different from the first embodiment in the shape of the yoke 156 and the shape of the plunger 155. The configurations, actions, and effects that are not particularly described in the second embodiment are the same as those in the first embodiment, and only the points different from those in the first embodiment will be described below. Note that FIGS. 7 and 8 do not show each part except the plunger, yoke, and coil part for the sake of easy understanding.

The yoke 156 includes an upstream first annular portion 560, an upstream tubular portion 1561, an upstream second annular portion 562, and a downstream tubular portion 563. The yoke 156 does not have an inclined portion that is inclined with respect to the axial direction. The upstream tubular portion 1561 is a tubular portion having a shape in which the end on the valve portion 57 side is connected to the upstream first annular portion 560 and the end on the plunger 55 side is connected to the upstream second annular portion 562. is there.

The plunger 155 includes an upstream annular portion 550, an inclined portion 555 inclined with respect to the axial direction, a tubular portion 551, and a downstream annular portion 552. The inclined portion 555 is a tubular portion having a shape in which the end portion on the upstream side (valve portion 57 side) is connected to the upstream annular portion 550 and the end portion on the plunger 55 side is connected to the tubular portion 551. The inclined portion 555 is a portion having a cross-sectional shape that is inclined with respect to the upstream side tubular portion 1561 of the yoke 156. The inclined portion 555 is formed so that the upstream end portion has a smaller diameter dimension than the downstream end portion. Therefore, the inclined portion 555 is inclined with respect to the upstream side tubular portion 1561 so that the diameter becomes larger toward the downstream side.

The upstream side or valve portion 57 side end of the inclined portion 555 is configured to have an outer diameter dimension smaller than the inner diameter dimension of the upstream side tubular portion 1561. The upstream tubular portion 1561 is provided so that the distance from the inclined portion 555 gradually decreases as the valve is moved from the valve open state shown in FIG. 7 to the valve closed state shown in FIG.

At the start of energization in the valve open state shown in FIG. 7, the distance between the plunger 155 and the yoke 156 on the upstream side is the shortest between the inclined portion 555 and the upstream tubular portion 1561. As described above, in the valve open state, the magnetic path, which is the first path through which the magnetic flux passes between the inclined portion 555 and the upstream tubular portion 1561, has a larger magnetic flux than the above-mentioned second path. In this way, when energization is started in the valve open state, the first path forms a magnetic path with a larger magnetic flux than the second path, and in the valve closed state, the second path has a larger magnetic flux than the first path. Form a path. The upstream-side second annular portion 562 extends radially from the downstream-side end of the upstream-side tubular portion 1561. The downstream tubular portion 563 extends axially from the outer peripheral edge of the upstream second annular portion 562. The upstream second annular portion 562 is a flange-shaped portion having a diameter larger than that of the downstream end of the upstream tubular portion 1561 and extending radially in a direction orthogonal to the downstream tubular portion 563. ..

As shown in FIG. 7, in the fluid control valve 5 of the second embodiment, the first path indicated by the solid line arrow becomes the dominant magnetic path than the second path indicated by the broken line arrow in the valve open state when energized. .. This is because the inclined portion 555 and the upstream tubular portion 1561 between the plunger 155 and the yoke 156 are the shortest distances, the portions having the minimum magnetic resistance, and the portions having the maximum magnetic flux. Therefore, in the fluid control valve 5, the suction force for sucking the plunger 155 in the valve open state is larger in the first path than in the second path, as in the characteristic diagram shown in FIG. Therefore, the fluid control valve 5 can suck the plunger 155 against the fluid pressure acting on the valve portion 57 by adopting a configuration in which the suction starts in the first path. According to the fluid control valve 5 of the second embodiment, the suction performance at the start of energization can be enhanced.

When the valve open state shown in FIG. 7 approaches the valve closed state and the valve closed state shown in FIG. 8 is reached, a reversal phenomenon occurs in which the second path becomes more dominant than the first path. This is because the upstream annular portion 550 and the upstream first annular portion 560 forming parallel portions are in contact with each other or are closest to each other between the plunger 155 and the yoke 156. Similar to the first embodiment, the fluid control valve 5 of the second embodiment provides a solenoid valve having advantageous characteristics related to the attractive force of both the first path and the second path shown in FIG. There is.

The first path of the second embodiment is a magnetic path through which magnetic flux passes between an inclined portion which is a part of one of the plunger and the yoke and has a cross-sectional shape inclined with respect to the other portion and the other portion. .. The second path is a magnetic path through which magnetic flux passes through parallel portions of the plunger and the yoke that face each other in the axial direction and have a cross-sectional shape that follows each other. This parallel portion is composed of an upstream annular portion 550 of the plunger 155 and an upstream first annular portion 560 of the yoke 156. According to this configuration, by providing the inclined portion 555, it is possible to form a first path having a larger magnetic flux than the second path passing through the parallel portion of the plunger and the yoke at the start of energization in the valve open state.

The yoke 156 of the second embodiment includes an upstream tubular portion 1561 extending in the axial direction. The plunger 155 includes an inclined portion 555 having a cross-sectional shape that is inclined with respect to the upstream side tubular portion 1561. The parallel portion includes an upstream first annular portion 560 upstream of the upstream tubular portion 1561 in the yoke 156 and an upstream annular portion 550 upstream of the inclined portion 555 in the plunger 155.

According to this configuration, the plunger 155 is provided with an inclined portion 555 with respect to the upstream tubular portion 1561 of the yoke 156. Therefore, the inner diameter of the portion of the plunger 155 provided on the downstream side of the inclined portion 555 can be increased. When the fluid passage is provided inside the plunger 155, it is possible to suppress the flow resistance of the working fluid while improving the valve closing performance against the pressure of the working fluid and the maintaining performance of the valve closed state.

Third Embodiment The third embodiment will be described with reference to FIGS. 9 and 10. The fluid control valve 5 of the third embodiment is different from the first embodiment in that it includes a plunger 155. The configurations, actions, and effects that are not particularly described in the third embodiment are the same as those in the above-described embodiments, and only the points different from those in the first embodiment and the second embodiment will be described below. Note that FIGS. 9 and 10 do not show each part except the plunger, yoke, and coil part for the sake of easy understanding.

As shown in FIGS. 9 and 10, the fluid control valve 5 of the third embodiment replaces the plunger 55 of the first embodiment with the plunger 155 adopted in the second embodiment.

At the start of energization in the valve open state shown in FIG. 9, the distance between the plunger 155 and the yoke 56 on the upstream side is the shortest between the inclined portion 555 and the inclined portion 561 which are inclined with respect to the axial direction. The inclined portion 555 and the inclined portion 561 form parallel portions having a cross-sectional shape along each other. As described above, in the valve open state, the magnetic flux, which is the first path through which the magnetic flux passes between the inclined portion 555 and the inclined portion 561, becomes larger than that of the above-mentioned second path. When energization is started in the valve open state, the first path forms a magnetic path in which the magnetic flux is larger than that in the second path, and in the valve closed state, the magnetic path in the second path is larger than that in the first path. To form.

Also in the fluid control valve 5 of the third embodiment, in the valve open state when energized, the first path indicated by the solid line arrow becomes the dominant magnetic path than the second path indicated by the broken line arrow. This is because the inclined portion 555 and the inclined portion 561 are the shortest distance between the plunger 155 and the yoke 56, the portion having the minimum magnetic resistance, and the portion having the maximum magnetic flux. According to the fluid control valve 5 of the third embodiment, the suction force for sucking the plunger 155 is larger in the first path than in the second path in the valve open state as in the characteristic diagram shown in FIG. The fluid control valve 5 of the third embodiment can suck the plunger 155 against the fluid pressure acting on the valve portion 57 by adopting a configuration in which suction is started in the first path. Therefore, according to the fluid control valve 5 of the third embodiment, the suction performance at the start of energization can be enhanced.

When the valve open state shown in FIG. 9 approaches the valve closed state and the valve closed state shown in FIG. 10 is reached, a reversal phenomenon occurs in which the second path becomes more dominant than the first path. This is because the upstream side annular portion 550 and the upstream side first annular portion 560 forming parallel portions are in close proximity or in contact with each other. Similar to the first embodiment, the fluid control valve 5 of the third embodiment provides a solenoid valve having advantageous characteristics related to the attractive force of both the first path and the second path shown in FIG.

The first path of the third embodiment is a magnetic path through which magnetic flux passes through parallel portions of the plunger 155 and the yoke 56 that are inclined with respect to the axial direction and have a cross-sectional shape that follows each other. This parallel portion is formed by an inclined portion 555 and an inclined portion 561. The second path is a magnetic path through which magnetic flux passes through parallel portions of the plunger 155 and the yoke 56 that face each other in the axial direction and have a cross-sectional shape that follows each other. This parallel portion is formed by an upstream side annular portion 550 and an upstream side first annular portion 560.

According to this configuration, by providing the

inclined portions

555 and 561 that are similarly inclined with respect to the axial direction, it is possible to form the first path having a larger magnetic flux than the second path at the start of energization in the valve open state. Further, the plunger 155 and the yoke 56 are provided with parallel portions that face each other in the axial direction in the process of opening the valve portion 57 from the valve closed state to the valve closed state. As a result, it is possible to switch to the second path having a large overlapping area or contact area between the plunger 55 and the yoke 56 and a large magnetic flux. As described above, the plunger 155 and the yoke 56 are provided with magnetic paths having a devised shape. Therefore, it is possible to provide the fluid control valve 5 capable of performing the valve closing operation from the valve opening state and maintaining the valve closing state without relying on an urging force such as a spring.

Fourth Embodiment The fourth embodiment will be described with reference to FIGS. 11 and 12. The fluid control valve 5 of the fourth embodiment is different from the second embodiment in that it includes a plunger 255 and a yoke 256. The configurations, actions, and effects that are not particularly described in the fourth embodiment are the same as those in the above-described embodiments, and only the differences from the first embodiment and the second embodiment will be described below. Note that FIGS. 11 and 12 do not show each part except the plunger, yoke and coil part for the sake of easy understanding.

The fluid control valve 5 of the fourth embodiment shown in FIGS. 11 and 12 includes a first path and a second path passing between the plunger 255 and the yoke 256 on both one end side and the other end side in the axial direction. .. One end side is the upstream side and the other end side is the downstream side. The plunger 255 and the yoke 256 have a first path and a second path similar to the fluid control valve 5 of the second embodiment on the valve portion 57 side, which is one end side in the axial direction. As described above, the fluid control valve 5 of the fourth embodiment includes a plurality of second paths.

The plunger 255 is provided with an inclined portion 556 that is inclined so that the surface of the outer peripheral edge of the downstream annular portion 552 becomes larger in diameter toward the downstream side. The yoke 256 includes an inclined portion 565 and a downstream annular portion 564 that connects the inclined portion 565 and the downstream side tubular portion 563.

The downstream annular portion 564 extends radially from the downstream end of the downstream tubular portion 563 and is integrated with the inclined portion 565 on the outer peripheral side. The downstream annular portion 564 and the downstream annular portion 552 form parallel portions along each other. The inclined portion 565 has a cross-sectional shape provided at an end portion on the downstream side, which is the other end side in the axial direction, and is inclined with respect to the axial direction. The inclined portion 565 has a cross-sectional shape that is inclined with respect to the downstream annular portion 552. The inclined portion 565 and the inclined portion 556 form parallel portions having a cross-sectional shape so as to follow each other in each of the plunger 255 and the yoke 256.

The downstream annular portion 552 is provided at a position where the upstream side surface 552b on the valve portion 57 side comes into contact with the downstream side surface 564b in the valve closed state. The downstream side surface 564b is a surface of the downstream annular portion 564 located on the side opposite to the valve portion 57 side. The downstream side surface 564b and the upstream side surface 552b are portions facing each other in the axial direction and form parallel portions along each other. The downstream annular portion 552 corresponds to a plunger parallel portion which is one of the parallel portions in the valve closed state. The downstream annular portion 564 corresponds to the yoke parallel portion, which is the other side of the parallel portion in the valve closed state.

During energization in the valve open state, magnetic flux passes between the inclined portion 565 and the downstream annular portion 552 at the downstream end of the plunger 255 and the yoke 256, and the downstream annular portion 564 and the downstream annular portion 552. Magnetic flux passes between. The area between the inclined portion 565 and the downstream annular portion 552 corresponds to the first path. The section between the downstream annular portion 564 and the downstream annular portion 552 corresponds to the second path. At the upstream ends of the plunger 255 and the yoke 256, the same first path and second path as in the second embodiment are formed. The distance between the plunger 255 and the yoke 256 on the downstream side in the valve open state is the shortest between the inclined portion 565 and the downstream annular portion 552.

When the valve open state shown in FIG. 11 approaches the valve closed state and the valve closed state shown in FIG. 12 is reached, a reversal phenomenon occurs in which the second path becomes more dominant than the first path. This is because the downstream annular portion 552 and the downstream annular portion 564 forming parallel portions are in contact with each other or are closest to each other between the plunger 255 and the yoke 256 on the downstream side. On the downstream side, the portion between the downstream annular portion 552 and the downstream annular portion 564 is the portion having the smallest magnetic resistance and the portion having the largest magnetic flux. As in the characteristic diagram of FIG. 6, the fluid control valve 5 changes so that the suction force of the plunger 255 becomes larger in the second path immediately before the valve closed state in which the stroke is small, as in the characteristic diagram of FIG. The fluid control valve 5 is provided on the downstream side with a configuration in which the valve portion 57 is attracted to the valve seat 511 by the second path. With this configuration, the valve portion 57 can be closed against the fluid pressure acting on the valve portion 57, and the suction holding force at the time of valve closing can be strengthened.

The plunger parallel portion and the yoke parallel portion are provided on both the upstream end on one end side and the downstream end on the other end side of the plunger 55 and the yoke 56. According to this configuration, the mechanism portion for strengthening the suction holding force of the plunger 55 and the yoke 56 can be installed at a place near and away from the valve portion 57. As a result, it is possible to provide a magnetic attraction force that easily affects the valve closing force at two relatively distant locations.

The plunger parallel portion and the yoke parallel portion are provided at the other end on the downstream side of the plunger 55 and the yoke 56. According to this configuration, it is possible to provide a degree of freedom in design in which the mechanical portion for strengthening the suction holding force of the plunger 55 and the yoke 56 can be installed at a distance from the valve portion 57.

The first path and the second path are provided between the plunger 255 and the yoke 256 at both the end on one end side on the upstream side and the end on the other end side on the downstream side, respectively. According to the fourth embodiment, it is possible to provide a solenoid valve having advantageous characteristics related to the attractive force of both the first path and the second path shown in FIG. 6 on both the upstream side and the downstream side.

In the valve closed state, the plunger 255 supports the valve portion support member in the upstream side in the axial direction, and contacts the yoke parallel portion of the yoke 256 on the downstream side. In the valve closed state, the plunger 255 supports the valve portion support member in the upstream side in the axial direction, and contacts the yoke parallel portion of the yoke 256 on the upstream side and the downstream side. As described above, the plunger 255 includes a plunger parallel portion in which a portion that contacts the yoke parallel portion and a portion that supports the valve portion support member 58 in the axial direction are separate portions.

In the fluid control valve 5 of the fourth embodiment, the second path is set to a plurality of parts. It is preferable that at least one of the second paths set at the plurality of sites is formed at a site where the plunger 255 and the yoke 256 come into contact with each other in the valve closed state. According to this configuration, at least one of the plurality of second paths is provided at a portion where the plunger 255 and the yoke 256 are in contact with each other. As a result, it is possible to provide an suction force that closes the valve portion 57 against the fluid pressure acting on the valve portion 57, so that the suction holding force at the time of closing the valve can be strengthened.

Fifth Embodiment The fifth embodiment will be described with reference to FIGS. 13 and 14. The fluid control valve 5 of the fifth embodiment is different from the second embodiment in that it includes a plunger 255 and a yoke 456. The configurations, actions, and effects not particularly described in the fifth embodiment are the same as those in the above-described embodiments. Hereinafter, only the differences from the first embodiment, the second embodiment, and the fourth embodiment will be described. Note that FIGS. 13 and 14 do not show each part except the plunger, yoke and coil part for the sake of easy understanding.

The fluid control valve 5 shown in FIGS. 13 and 14 is provided with a first path and a second path passing between the plunger 255 and the yoke 456 on both one end side and the other end side in the axial direction. The plunger 255 and the yoke 456 have a first path and a second path similar to the fluid control valve 5 of the second embodiment on the valve portion 57 side or the upstream side, which is one end side in the axial direction. As described above, the fluid control valve 5 of the fifth embodiment includes a plurality of second paths.

The configuration of the plunger 255 is the same as the description of the fourth embodiment. The yoke 456 includes a downstream end tubular portion 567 and a downstream annular portion 564 that connects the downstream end tubular portion 567 and the downstream side tubular portion 563. The downstream end tubular portion 567 has a cross-sectional shape that is provided at the downstream end on the other end side in the axial direction and extends in the axial direction. The downstream annular portion 564 extends radially from the downstream end of the downstream tubular portion 563 and is integrated with the downstream end tubular portion 567 on the outer peripheral side. The inclined portion 556 has a cross-sectional shape that is inclined with respect to the downstream end tubular portion 567.

During energization in the valve open state shown in FIG. 13, magnetic flux passes through the first path between the downstream annular portion 552 and the downstream end tubular portion 567 at the downstream end of the plunger 255 and the yoke 456. At the upstream ends of the plunger 255 and the yoke 456, the same first path and second path as in the second embodiment are formed. The distance between the plunger 255 and the yoke 456 on the downstream side in the valve open state is the shortest between the downstream annular portion 552 and the downstream end tubular portion 567.

When the valve open state shown in FIG. 13 approaches the valve closed state and the valve closed state shown in FIG. 14 is reached, a reversal phenomenon occurs in which the second path becomes more dominant than the first path. This is because the downstream annular portion 552 and the downstream annular portion 564 forming parallel portions are in contact with each other, or the plunger 255 and the yoke 456 are closest to each other on the downstream side. On the downstream side, the portion between the downstream annular portion 552 and the downstream annular portion 564 is the portion having the smallest magnetic resistance and the portion having the largest magnetic flux. A first path having a smaller magnetic flux than the second path is formed between the inclined portion 556 and the downstream end tubular portion 567.

The fluid control valve 5 changes so that the suction force of the plunger 255 becomes larger in the second path immediately before the valve closed state in which the stroke is small, as in the characteristic diagram of FIG. 6 on the downstream side. The fluid control valve 5 is provided on the downstream side with a configuration in which the valve portion 57 is attracted to the valve seat 511 by the second path. As a result, the valve portion 57 can be closed against the fluid pressure acting on the valve portion 57, so that the suction holding force at the time of closing the valve can be strengthened.

The first path and the second path are provided between the plunger 255 and the yoke 456 at both the upstream end on one end side and the downstream end on the other end side, respectively. According to the fifth embodiment, it is possible to provide a solenoid valve having advantageous characteristics related to the attractive force of both the first path and the second path shown in FIG. 6 on both the upstream side and the downstream side.

In the fluid control valve 5 of the fifth embodiment, the second path is set to a plurality of parts. It is preferable that at least one of the second paths set at the plurality of sites is formed at a site where the plunger 255 and the yoke 456 come into contact with each other in the valve closed state. According to this configuration, it is possible to provide an suction force that closes the valve portion 57 against the fluid pressure acting on the valve portion 57, so that the suction holding force at the time of closing the valve can be strengthened.

Sixth Embodiment The sixth embodiment will be described with reference to FIGS. 15 and 16. The fluid control valve 5 of the sixth embodiment is different from the fluid control valve 5 of the second embodiment in that it includes a plunger 355. The configurations, actions, and effects not particularly described in the sixth embodiment are the same as those in the above-described embodiments. Hereinafter, only the points different from the first embodiment and the second embodiment will be described. Note that FIGS. 15 and 16 do not show each part except the plunger, yoke and coil part for the sake of easy understanding.

As shown in FIGS. 15 and 16, the fluid control valve 5 of the sixth embodiment forms a magnetic path by the plunger 355 and the yoke 156 of the second embodiment. The fluid control valve 5 of the sixth embodiment includes a first path passing between the plunger 355 and the yoke 156 on both one end side and the other end side in the axial direction. The plunger 355 and the yoke 156 have a first path and a second path similar to the fluid control valve 5 of the second embodiment on the valve portion 57 side or the upstream side, which is one end side in the axial direction.

The plunger 355 includes a downstream end tubular portion 557 provided at the downstream end on the other end side in the axial direction. The downstream end tubular portion 557 has a cross-sectional shape extending from the outer peripheral edge of the downstream annular portion 552 to the downstream side. The downstream end tubular portion 557 is inclined in the axial direction with respect to the tubular portion 551 or the downstream annular portion 552 so that the diameter dimension increases toward the downstream side.

The configuration of the yoke 156 is the same as the description of the second embodiment. The downstream end tubular portion 557 is a portion having a cross-sectional shape that is inclined with respect to the downstream side tubular portion 563 of the yoke 156, and constitutes the inclined portion.

When the valve is open and energized as shown in FIG. 15, magnetic flux is generated in the first path between the downstream tubular portion 563 and the downstream end tubular portion 557 at the downstream end of the plunger 355 and the yoke 156. Pass. At the upstream ends of the plunger 355 and the yoke 156, the same first path and second path as in the second embodiment are formed. The distance between the plunger 355 and the yoke 156 on the downstream side in the valve open state is the shortest between the downstream side tubular portion 563 and the downstream end tubular portion 557.

When the valve closed state is approached from the valve opened state shown in FIG. 15 and the valve closed state shown in FIG. 16 is reached, the distance between the downstream side tubular portion 563 and the downstream end tubular portion 557 becomes smaller. Therefore, in the valve closed state, the magnetic flux passing between the downstream side tubular portion 563 and the downstream end tubular portion 557 is larger than in the valve opened state. On the downstream side, the portion between the downstream side tubular portion 563 and the downstream end tubular portion 557 is the portion having the smallest magnetic resistance and the portion having the largest magnetic flux.

Seventh Embodiment The seventh embodiment will be described with reference to FIGS. 17 and 18. The fluid control valve 5 of the seventh embodiment is different from the fluid control valve 5 of the second embodiment in that the yoke 456 of the fifth embodiment is provided. The configurations, actions, and effects that are not particularly described in the seventh embodiment are the same as those in the above-described embodiments, and are different from the first embodiment, the second embodiment, the fourth embodiment, and the fifth embodiment. Will be described only. Note that FIGS. 17 and 18 do not show each part except the plunger, yoke, and coil part for the sake of easy understanding.

In the fluid control valve 5 of the seventh embodiment shown in FIGS. 17 and 18, the first path and the second path passing between the plunger 155 and the yoke 456 are provided on both one end side and the other end side in the axial direction. Be prepared. The plunger 155 and the yoke 456 have a first path and a second path similar to the fluid control valve 5 of the second embodiment on the valve portion 57 side or the upstream side, which is one end side in the axial direction. The configuration of the plunger 155 is the same as the description of the second embodiment, and the configuration of the yoke 456 is the same as the description of the fifth embodiment.

When the valve is open and energized as shown in FIG. 17, magnetic flux passes through the first path between the downstream annular portion 552 and the downstream end tubular portion 567 at the downstream end of the plunger 155 and the yoke 456. .. The distance between the plunger 155 and the yoke 456 on the downstream side in the valve open state is the shortest between the downstream annular portion 552 and the downstream end tubular portion 567. At the upstream ends of the plunger 155 and the yoke 456, the same first path and second path as in the second embodiment are formed.

When the valve open state shown in FIG. 17 approaches the valve closed state and the valve closed state shown in FIG. 18 is reached, a reversal phenomenon occurs in which the second path becomes more dominant than the first path. This is because the downstream annular portion 552 and the downstream annular portion 564 forming parallel portions are in contact with each other or are closest to each other between the plunger 255 and the yoke 456 on the downstream side. On the downstream side, the portion between the downstream annular portion 552 and the downstream annular portion 564 is the portion having the smallest magnetic resistance and the portion having the largest magnetic flux.

The fluid control valve 5 changes so that the suction force of the plunger 155 becomes larger in the second path immediately before the valve closed state in which the stroke is small, as in the characteristic diagram of FIG. 6 on the downstream side. The fluid control valve 5 of the seventh embodiment is provided on the downstream side with a configuration in which the valve portion 57 is attracted to the valve seat 511 by the second path. As a result, the valve portion 57 can be closed against the fluid pressure acting on the valve portion 57, so that the suction holding force at the time of valve closing can be strengthened.

The first path and the second path of the seventh embodiment are provided between the plunger 155 and the yoke 456 at both the one-sided end on the upstream side and the other-side end on the downstream side. ing. According to the seventh embodiment, it is possible to provide a solenoid valve having advantageous characteristics related to the attractive force of both the first path and the second path shown in FIG. 6 on both the upstream side and the downstream side.

The configuration of the fluid control valve 5 of the seventh embodiment related to the inclined portion on the upstream side can be replaced with the configuration of the fluid control valve 5 of the first embodiment related to the inclined portion of the upstream side.

(Other embodiments)
The disclosure of this specification is not limited to the illustrated embodiments. The disclosure encompasses the illustrated embodiments and variations on them based on them. For example, the disclosure is not limited to the combination of parts and elements shown in the embodiments, and various modifications can be implemented. Disclosure can be carried out in various combinations. The disclosure may have additional parts that may be added to the embodiments. The disclosure includes parts and elements of the embodiments omitted. The disclosure includes replacements or combinations of parts, elements between one embodiment and another. The disclosed technical scope is not limited to the description of the embodiments. The technical scope disclosed is indicated by the description of the scope of claims, and should be understood to include all changes within the meaning and scope equivalent to the description of the scope of claims.

The fluid control valve 5 capable of achieving the object described in the specification is not limited to a configuration including a yoke parallel portion and a plunger parallel portion which are portions orthogonal to the axial direction. The fluid control valve 5 capable of achieving the object includes, for example, a configuration including a yoke parallel portion and a plunger parallel portion, which are portions that intersect so as to be inclined with respect to the axial direction.

Regarding the fourth to seventh embodiments, the first route on the upstream side may have the same configuration as the first route of the first embodiment and the third embodiment. The shape of the plunger on the downstream side of the fourth embodiment may be the same as the shape of the plunger on the downstream side of the first embodiment.

The fluid control valve 5 capable of achieving the object disclosed in the specification does not limit the first path and the second path to the positions described in the above-described embodiments. For example, each of the above-described embodiments may be configured such that the shapes of the plunger and the yoke with respect to the magnetic path are reversed on the upstream side and the downstream side.

In the above-described embodiment, the valve portion 57 is a member mounted on the valve portion support member 58 driven by the plunger 55, but the fluid control valve is not limited to this embodiment. For example, the valve portion 57 may be a member integrally provided with the plunger 55, or may be a portion forming a part of the plunger 55.

The fluid control valve 5 can be configured as a valve in which the control device 8 controls the duty ratio, which is the ratio of the on-time to the time of one cycle consisting of the on-time and the off-time of energization. According to the energization control for the fluid control valve 5, the flow rate of the cooling water flowing through the second flow path 11 can be freely adjusted.

The fluid control valve 5 that can achieve the object disclosed in the specification is not limited to the solenoid valve that can control the flow rate of the cooling water in the cooling water circuit 1 in which the cooling water of the engine 2 circulates. The fluid control valve 5 can be used, for example, as a solenoid valve that controls the flow rate of a working fluid that can cool a motor, an inverter, a semiconductor device, or the like. The fluid control valve 5 can be used, for example, as a solenoid valve that controls the flow rate of a hydraulic fluid used for cooling or heating, or a solenoid valve that controls the flow of hydraulic oil such as automatic oil.

Claims

A housing (51) having an internal passage (512) through which the working fluid flows,
A valve portion (57) that opens and closes the internal passage so as to switch between a valve open state that allows the flow of the working fluid and a valve closed state that blocks the flow of the working fluid.
With the valve portion support member (58) to which the valve portion is mounted or the valve portion forms a part,
A plunger (55; 155; 255; 355) that is a member separate from the valve portion support member and drives the valve portion support member in the axial direction, and
A coil portion (540) that generates a magnetic force that drives the plunger in the axial direction when energized to switch between the valve open state and the valve closed state.
A yoke (56; 156; 256; 456) that is fixedly installed and forms a magnetic circuit together with the plunger when energized.
Parallel portions (550, 560; 552) provided on the plunger and the yoke so as to form a magnetic path through which magnetic flux passes between the plunger and the yoke, and which are opposite to each other and have a cross-sectional shape so as to follow each other. , 564),
With
In the valve closed state, the plunger parallel portion, which is one of the parallel portions, contacts the yoke parallel portion, which is the other of the parallel portions, or indirectly contacts through an inclusion so as to form a magnetic path, and The plunger is a fluid control valve that is in contact with the valve portion support member in the axial direction or indirectly through inclusions.
The first path (551,561; 555,1561; 555,561; 552,565; 552,567; 557,563), which is a magnetic path through which magnetic flux passes between the plunger and the yoke,
A second path (550, 560; 552, 564), which is a magnetic path through which magnetic flux passes between the plunger and the yoke at a site different from the first path,
With
When energization is started in the valve open state, the first path forms a magnetic path in which the magnetic flux is larger than that of the second path, and in the valve closed state, the second path is larger than the first path. The fluid control valve according to claim 1, which forms a magnetic path in which the magnetic flux becomes large.
In a state where the fluid pressure does not act on the valve portion in the valve opening direction, the valve portion contacts the valve seat (511), and then the plunger parallel portion contacts the yoke parallel portion or the indirect portion. The fluid control valve according to claim 1, wherein the fluid control valve is brought into the closed state by being brought into contact with each other.
In the valve closed state in which the valve portion and the valve seat (511) are in close contact with each other, the plunger parallel portion contacts the yoke parallel portion or indirectly contacts through the inclusions so as to form a magnetic path. The fluid control valve according to claim 1, wherein the plunger is in contact with or indirectly in contact with the valve portion support member in the axial direction.
The fluid control valve according to claim 1, wherein in the closed state, the valve portion support member is supported in the axial direction by the plunger parallel portion.
The fluid control valve according to claim 5, wherein the plunger parallel portion is in contact with the yoke parallel portion and the valve portion support member on the same surface.
The plunger comprises a tubular portion (551) extending in the axial direction.
The plunger parallel portion includes a movable-side upstream annular portion that extends so as to intersect the tubular portion and is provided on the plunger on the upstream side of the working fluid with respect to the tubular portion.
The fluid according to any one of claims 1 to 6, wherein the yoke parallel portion includes a fixed-side upstream annular portion provided on the yoke on the upstream side of the working fluid with respect to the movable-side upstream annular portion. Control valve.
The fluid control valve according to any one of claims 1 to 7, wherein the yoke parallel portion and the plunger parallel portion are portions that face each other in the axial direction and are orthogonal to the axial direction.
The plunger parallel portion and the yoke parallel portion are both an end portion on one end side, which is an upstream side of the working fluid, and an end portion on the other end side, which is a downstream side of the working fluid, in the plunger and the yoke. The fluid control valve according to any one of claims 1 to 5, which is provided in the above.
One of claims 1 to 5, wherein the plunger parallel portion and the yoke parallel portion are provided at the other end side of the plunger and the yoke on the downstream side of the working fluid. The fluid control valve described in.
The fluid control valve according to any one of claims 1 to 10, further comprising a fluid passage (553) through which the working fluid flows inside the plunger.
The fluid control valve according to any one of claims 1 to 10, wherein a fluid passage (553) through which the working fluid flows is provided inside the coil portion and inside the plunger.