JP7107260B2 - fluid control valve - Google Patents

Description

The disclosure herein relates to fluid control valves.

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

Japanese Patent No. 5811797

In the on-off valve disclosed in Patent Document 1, the valve element constitutes a valve portion and a plunger. In the case of an on-off valve in which the plunger and the valve portion are formed 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.

An object of the disclosure in this specification is to provide a fluid control valve that achieves stable magnetic attraction force and valve closing force when the valve is closed.

The multiple aspects disclosed in this specification employ different technical means to achieve their respective objectives. In addition, the symbols in parentheses described in the claims and this section are an example showing the correspondence relationship with the specific means described in the embodiment described later as one aspect, and limit the technical scope is not.

One of the disclosed fluid control valves includes a housing (51) having an internal passageway (512) through which working fluid flows, and an open state that permits flow of working fluid and a closed state that prevents flow of working fluid. The valve portion (57) for opening and closing the internal passage so as to switch between the two, the valve portion support member (58) to which the valve portion is attached or the valve portion forms a part, and the valve portion support member are separate members. a plunger (55; 155; 255; 355) for axially driving the valve supporting member; (540), a yoke (56; 156; 256; 456) which is fixedly installed and forms a magnetic circuit with the plunger when energized, and a plunger so as to form a magnetic path through which magnetic flux passes between the plunger and the yoke. Parallel parts (550, 560; 552, 564) provided in the yoke and facing each other and having cross-sectional shapes along each other,
In the valve closed state, the plunger parallel portion, which is one of the parallel portions, is in contact with the yoke parallel portion, which is the other of the parallel portions, or is in contact via an interposition so as to form a magnetic path, and the plunger is in contact with the valve support member. is in axial contact with or indirectly through an intervening material.

According to this fluid control valve, the plunger-parallel portion directly or indirectly contacts the yoke-parallel portion when the valve is closed, so that the axial positions of the plunger and the yoke can be maintained in an appropriate state. In the valve closed state, the plunger also contacts the valve support member in the axial direction or indirectly through an interposition. Therefore, the axial position of the valve portion can be maintained in an appropriate state with the yoke-parallel portion as a reference. As described above, it is possible to provide a fluid control valve that achieves stable magnetic attraction force and valve closing force when the valve is closed.

1 is a configuration diagram showing a cooling water circuit according to a first embodiment; FIG. FIG. 3 is a cross-sectional view showing the valve open state of the fluid control valve of the first embodiment; FIG. 3 is a cross-sectional view showing a closed state of the fluid control valve of the first embodiment; FIG. 4 is an enlarged view for explaining magnetic paths between a yoke and a plunger in a valve open state; FIG. 4 is an enlarged view for explaining magnetic paths between a yoke and a plunger in a valve closed state; FIG. 5 is a characteristic diagram showing the relationship between stroke and attraction force for a first path and a second path; FIG. 10 is a diagram illustrating a magnetic path between a yoke and a plunger in the valve open state of the fluid control valve of the second embodiment; FIG. 4 is an enlarged view for explaining magnetic paths between a yoke and a plunger in a valve closed state; FIG. 11 is a diagram illustrating a magnetic path between a yoke and a plunger in the valve open state of the fluid control valve of the third embodiment; FIG. 4 is an enlarged view for explaining magnetic paths between a yoke and a plunger in a valve closed state; It is a figure explaining the magnetic path|route between a yoke and a plunger in the valve open state about the fluid control valve of 4th Embodiment. FIG. 4 is an enlarged view for explaining magnetic paths between a yoke and a plunger in a valve closed state; FIG. 11 is a diagram illustrating a magnetic path between a yoke and a plunger in the valve open state of the fluid control valve of the fifth embodiment; FIG. 4 is an enlarged view for explaining magnetic paths between a yoke and a plunger in a valve closed state; FIG. 12 is a diagram illustrating a magnetic path between a yoke and a plunger in the valve open state of the fluid control valve of the sixth embodiment; FIG. 4 is an enlarged view for explaining magnetic paths between a yoke and a plunger in a valve closed state; FIG. 20 is a diagram illustrating a magnetic path between a yoke and a plunger in an open state of the fluid control valve of the seventh embodiment; FIG. 4 is an enlarged view for explaining magnetic paths between a yoke and a plunger in a valve closed state;

A plurality of modes for carrying out the present disclosure will be described below with reference to the drawings. In each form, the same reference numerals may be given to the parts corresponding to the matters described in the preceding form, and overlapping explanations may be omitted. When only a part of the configuration is described in each form, the previously described other forms can be applied to other parts of the configuration. Not only combinations of parts that are explicitly stated that combinations are possible in each embodiment, but also partial combinations of embodiments even if they are not explicitly stated unless there is a particular problem with the combination. is also possible.

(First embodiment)
A first embodiment disclosing an example of a fluid control valve will be described with reference to FIGS. 1 to 6. FIG. A 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, liquid such as gas, water, or oil. A 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 up and cooling an 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 device and at least one memory device as a storage medium for storing programs and data. The controller 8 is provided, for example, by a microcomputer with a computer-readable storage medium. The storage medium is a non-transitional tangible storage medium that non-temporarily stores a computer-readable program. A storage medium may be provided by a semiconductor memory, a magnetic disk, or the like. Controller 8 may be provided by a single computer or 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 is executed by controller 8 to cause controller 8 to function to perform the methods described herein. The control device 8 includes hardware and/or software functional units for performing various processes for warming up and cooling the engine 2 .

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

The first flow path 10 is a flow path that allows fluid flowing out of the engine 2 to flow into the engine 2 via the pump 3 . The first flow path 10 is a flow path through which the fluid circulates through the engine 2 , switching valve 4 and pump 3 without passing through the heater core 6 and radiator 7 . Inside the engine 2, a flow path is formed for circulating cooling water. The cooling water flowing inside the engine 2 absorbs the heat of the engine 2 and raises its own temperature, thereby lowering the internal temperature of the engine 2 . The second flow path 11 diverges the cooling water flowing out of the engine 2 from the upstream portion of the first flow path 10 and returns it to the downstream portion of the first flow path 10 via the fluid control valve 5 and the heater core 6. is the 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 upstream 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 the junction where the third flow path 12 connects to the first flow path 10 on the downstream side. The switching valve 4 is configured to be able to switch the flow path of cooling water flowing out of the engine 2 between a first state and a second state. The first state is a state in which the first flow path 10 and the third flow path 12 are not communicated so that the cooling water circulates through the first flow path 10 . The second state is a state in which all three passages connected in the switching valve 4 are opened. The switching valve 4 is 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 a thermostat valve, for example. The switching valve 4 changes its valve opening according to the amount of heat applied to the temperature-sensitive wax or the temperature of the cooling water.

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 is a valve that can switch its degree of opening between two states, ie, a closed state and an open state. When the fluid control valve 5 is in the closed state, the cooling water does not flow through the second flow path 11 but flows only through the first flow path 10 in the first state. When the fluid control valve 5 is open, cooling water flows through both the first flow path 10 and the second flow path 11 in the first state. As described above, the second channel 11 and the third channel 12 are arranged in parallel with the first channel 10 .

The controller 8 controls the fluid control valve 5 based on the coolant temperature detected by the coolant temperature sensor. After the engine 2 is started, when 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 through the first flow path 10, warm-up of the engine 2 is facilitated.

When the cooling water temperature reaches or exceeds the first temperature, the warm-up control of the engine 2 ends. When the cooling water temperature reaches or exceeds a second temperature set higher than the first temperature, the switching valve 4 switches to the second state. The cooling water circulates through the third flow path 12 and heats the cooling water in the radiator 7 . When the control device 8 cuts off the power supply and the fluid control valve 5 is controlled to be open, the cooling water circulates through the second flow path 11 and the heat of the cooling water is also released in the heater core 6 . In the first state, if the heater core 6 needs to release heat from the cooling water, the controller 8 may cut off the power supply to open the fluid control valve 5 .

As another form, the cooling water circuit 1 described above may have only a path through 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 be configured without the first flow path 10 . The control device 8 may be configured to control the fluid control valve 5 based on the detected value of a sensor that detects the engine oil temperature or the oil temperature of the transmission or the like.

The fluid control valve 5 will be explained 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 that is a seat valve, a valve portion 57, a valve portion support member 58, a plunger 55 that is a movable core, an electromagnetic solenoid portion 54, and the like. The fluid control valve 5 is an electromagnetic valve device configured such that the pressure of the working fluid acts in the valve opening direction, which is the direction in which the valve portion 57 moves away from the valve seat 511 . That is, the fluid control valve 5 is an electromagnetic valve device in which the closing direction of the valve portion 57 is set in the direction against the fluid pressure. The fluid control valve 5 opens and closes an internal passage 512 provided in the housing in accordance with 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 an open state in which the fluid passage is open and a valve closed state in which the fluid passage is closed, with the direction opposite to the pressure action direction of the working fluid flowing therein being the valve closing direction.

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

The plunger 55 has a cylindrical portion 551 open at both ends in the axial direction. The plunger 55 includes an upstream annular portion 550 provided at one end of a 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 as the cylindrical portion 551 and has an upstream opening 550a coaxial with the cylindrical 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 displaceable in the axial direction. The axial direction is also the moving direction of the valve portion 57 . Thereby, the valve support member 58 is axially displaced 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 by a form that does not come into direct contact with the valve portion support member 58 . In this case, the upstream annular portion 550 indirectly contacts the valve portion support member 58 via an intervening material. This inclusion is 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 during 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 state in which they are separated to a state in which they are in direct or indirect contact when the valve is closed. 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 larger diameter than the cylindrical portion 551 and radially extending in a direction orthogonal to the cylindrical portion 551 . The downstream annular portion 552 is internally provided with a downstream opening that is coaxial with the cylindrical portion 551 . A fluid passage 553 is provided inside the cylindrical portion 551 . The fluid passage 553 uses the upstream opening 550a as a fluid inlet. The plunger 55 is made of a material that allows magnetism to pass, such as a magnetic material.

The valve portion support member 58 is configured integrally with the valve portion 57 by coupling the valve portion 57 . The valve support member 58 includes an upstream tubular portion 582 , an upstream disk portion 580 and a downstream tubular portion 583 . The upstream disk portion 580 is a disk-shaped portion integrally provided at the upstream end portion of the upstream cylindrical portion 582 . A valve portion 57 is attached to the upstream side plate portion 580 . A fluid passage 581 is provided through the upstream cylindrical portion 582 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 provided integrally with 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 inserted into an opening 560 a provided in the upstream first annular portion 560 of the yoke 56 and supported so as to be slidable in the axial direction. When the valve support member 58 is in the valve open state, the downstream end of the upstream cylindrical portion 582 contacts the first upstream annular portion 560, thereby restricting further displacement in the valve opening direction. . Therefore, the downstream cylindrical portion 583 is regulated by the yoke 56 so as to be displaceable within a predetermined range in the axial direction and substantially immovable in the radial direction. The valve support member 58 is made of a material such as a resin material that does not easily transmit magnetism. Therefore, the valve 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 in which the axial 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 facing a valve seat 511 provided on the inflow side housing 51 .

The fluid control valve 5 comprises a housing body defining an internal passageway 512 for working fluid. The housing body includes an inflow-side housing 51 , an outflow-side housing 53 , and an intermediate housing 52 connecting 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 provided integrally with the intermediate housing 52, and incorporates the valve portion 57, most of the valve portion support member 58, and the like. The inflow side housing 51 has a valve seat 511 around the inflow port 510 on which the valve portion 57 displaced in the valve closing direction is seated. In the closed state, the valve seat 511 contacts the valve portion 57 so as to form an annular surface or annular line.

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

The intermediate housing 52 incorporates the yoke 56, plunger 55, coil portion 540, bobbin 541, sliding support member 542, and the like. The yoke 56 is fixedly installed within the housing of the fluid control valve 5 . The yoke 56 is made of a material that allows magnetism to pass, such as a magnetic material. The yoke 56 forms part of the magnetic circuit and supports the bobbin 541 and the sliding support member 542 inside the intermediate housing 52 . The yoke 56 is provided so as to cover the outer peripheral sides 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 supports the outer surface of the cylindrical portion 551 of the plunger 55 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 pass magnetic flux.

The electromagnetic solenoid portion 54 includes a yoke 56, a coil portion 540, a bobbin 541, a sliding support member 542, a connector, and the like. The connector is provided so as to be positioned laterally or outside the yoke 56 . A connector is provided for energizing the coil portion 540 . Terminal terminals inside the connector are electrically connected to the coil portion 540 . The electromagnetic solenoid section 54 can control the current applied to the coil section 540 by electrically connecting the terminal terminals to a current control device or the like through a connector. The bobbin 541 is made of a resin material and has a cylindrical shape, and the coil portion 540 is wound around the outer peripheral surface of the bobbin 541 . The coil portion 540 generates a magnetic force that axially drives the plunger 55 when energized in order to switch between the valve open state and the valve closed state.

The yoke 56 is a cylindrical body that is open at both ends 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 cylindrical portion 563 . The upstream first annular portion 560 is provided at one end of the yoke 56 on the valve portion 57 side. The first upstream annular portion 560 is provided so as to be axially contactable with the upstream annular portion 550 of the plunger 55 . The first upstream annular portion 560 has an opening 560 a that has a larger diameter than the upstream annular portion 550 and is coaxial with the upstream opening 550 a of the plunger 55 as a through hole.

The first upstream annular portion 560 and the upstream annular portion 550 are axially opposed portions and form parallel portions having cross-sectional shapes along each other. Hereinafter, the cross-sectional shape related to the inclined portion and the parallel portion means the longitudinal cross-sectional shape along the axial direction of the plunger or the like. The first upstream 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 magnetic flux passes between the plunger 55 and the yoke 56 .

The first upstream annular portion 560 is provided such that a downstream side surface 560b opposite to the valve portion 57 contacts an upstream side surface 550b of the upstream annular portion 550 located on the valve portion 57 side in a valve closed state. The valve closed state is a state in which the internal passage 512 is closed so as to block the flow of 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, but also a state in which the valve portion 57 and the valve seat 511 are not in contact with each other and block the flow of 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 first upstream annular portion 560 and the upstream annular portion 550 are in contact. The upstream annular portion 550 corresponds to the plunger parallel portion, which is one of the parallel portions in the valve closed state. The first upstream annular portion 560 corresponds to a yoke parallel portion that is the other of the parallel portions in the valve closed state. The first upstream annular portion 560 and the upstream annular portion 550 are portions facing each other in the axial direction and orthogonal to the axial direction. The upstream annular portion 550 is a movable upstream annular portion that extends to intersect the tubular portion 551 and is provided in the plunger 55 upstream of the working fluid from the tubular portion 551 . The first upstream annular portion 560 is a fixed upstream annular portion provided in the yoke 56 on the upstream side of the working fluid relative to the movable upstream annular portion.

The upstream annular portion 550 and the first upstream annular portion 560 may be configured so as not to directly contact 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 through the interposition so as to form a magnetic path through the interposition. The inclusions are, for example, non-magnetic or magnetic. The inclusion is an object through which magnetic flux passes between the upstream annular portion 550 and the first upstream annular portion 560 in the valve closed state.

The inclined portion 561 is a tubular portion having a shape in which the valve portion 57 side end is connected to the upstream first annular portion 560 and the plunger 55 side end is connected to the upstream second annular portion 562 . The inclined portion 561 is a cylindrical 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 such that the upstream end has a smaller diameter than the downstream end. Therefore, the inclined portion 561 is inclined with respect to the tubular portion 551 so that the diameter increases 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 is configured to have a diameter larger than that of the cylindrical portion 551 . The cylindrical portion 551, particularly its upstream portion, is provided so that the distance from the inclined portion 561 gradually decreases as the valve moves from the open state to the closed state. 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 at the start of energization in the valve open state. Thus, in the valve open state, the magnetic flux in the magnetic path, which is the first path through which the magnetic flux passes between the inclined portion 561 and the cylindrical portion 551, is larger than that in the second path described above. 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. do.

The upstream second annular portion 562 radially extends from the downstream end of the inclined portion 561 in the yoke 56 . The downstream tubular portion 563 axially extends 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 larger diameter than the downstream end portion of the inclined portion 561 and radially extending in a direction perpendicular to the downstream tubular portion 563 . The cross-sectional shape of the second upstream annular portion 562 is parallel to the first upstream annular portion 560 . The inner peripheral surface of the downstream cylindrical portion 563 is positioned to face 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 the 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 greater in the first path than in the second path while the valve is approaching the closed state from the open state. Furthermore, this attraction force has a characteristic that a reversal phenomenon occurs immediately before the valve is closed, and the second path is larger than the first path when the valve is closed. As shown in FIG. 4, when the valve is open when energized, the first path indicated by solid line arrows becomes a more dominant magnetic path than the second path indicated by broken line arrows. This is because between the plunger 55 and the yoke 56, the inclined portion 561 and the cylindrical portion 551 are the shortest distance, the minimum magnetic resistance, and the maximum magnetic flux. Therefore, in the valve open state with a large stroke, the suction force for sucking the plunger 55 is greater in the first path than in the second path in the fluid control valve 5, as in the characteristic diagram of FIG. The fluid control valve 5 can suck the plunger 55 against the fluid pressure acting on the valve portion 57 by adopting a configuration in which suction is started in the first path. Therefore, the fluid control valve 5 can enhance the suction performance at the start of energization.

When the open state shown in FIG. 4 approaches the closed state and the 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 first upstream annular portion 560 that are parallel to each other are in contact or closest to each other between the plunger 55 and the yoke 56 . Therefore, the portion between the upstream annular portion 550 and the first upstream annular portion 560 has the smallest magnetic resistance and 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 55 is greater in the second path immediately before the closed valve state with a short stroke. The fluid control valve 5 employs a configuration in which the valve portion 57 is attracted to the valve seat 511 through the second path, so that the valve portion 57 can be shut off against the fluid pressure acting on the valve portion 57 . Therefore, it is possible to strengthen the suction holding force when the valve is closed. As described above, the fluid control valve 5 provides a solenoid valve that combines the advantageous characteristics of the attraction forces of both the first and second paths shown in FIG.

Next, the operational effects of the fluid control valve 5 of the first embodiment will be described. The fluid control valve 5 includes a valve support member 58 to which the valve member 57 is attached or of which the valve member 57 forms a part, and a plunger 55 that axially drives the valve support member 58 . 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 the plunger 55 when energized. The fluid control valve 5 includes parallel portions having cross-sectional shapes 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 . 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 an interposition so as to form a magnetic path. In the valve closed state, the plunger 55 is also in contact with the valve support member 58 in the axial direction or indirectly through an interposition.

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 axially supports the valve support member 58 . Therefore, the axial position of the valve portion 57 can be maintained in an appropriate state with the yoke-parallel portion as a reference. As described above, it is possible to provide the fluid control valve 5 capable of achieving stable magnetic attraction force and valve closing force when the valve is closed.

In a state where the fluid pressure is not acting on the valve portion 57 in the valve opening direction, after the valve portion 57 contacts the valve seat 511, the parallel portion of the plunger contacts the parallel portion of the yoke or indirectly through an interposition. contact with each other to close the valve. According to this configuration, when the valve portion 57 is in contact with the valve seat 511, the axial positions of the plunger 55 and the yoke 56 can be maintained in an appropriate state. The fluid control valve 5 can maintain the closed state while exhibiting the magnetic attraction force.

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

According to this configuration, the valve portion 57 can be brought into close contact with the valve seat 511 in a state in which 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 support member 58 is axially supported by the plunger parallel portion. With this configuration, the valve support member 58 can be supported by the plunger-parallel portion that is attracted to the yoke-parallel portion. Therefore, the supporting force 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 contacts the yoke parallel portion and the valve support member 58 on the same plane. According to this configuration, it is possible to provide the fluid control valve 5 in which the axial position of the valve portion is maintained in an appropriate state with reference to the surface of the portion parallel to the plunger.

The plunger-parallel portion includes a movable-side upstream annular portion extending across the cylindrical portion 551 and upstream of the working fluid from the cylindrical portion 551 . The yoke-parallel portion includes a stationary upstream annular portion upstream of the working fluid from the movable upstream annular portion. According to this configuration, the movable-side upstream annular portion directly or indirectly contacts the fixed-side upstream annular portion in the valve closed state. For this reason, since the mechanical portion that strengthens the attraction holding force of the plunger 55 and the yoke 56 can be installed near the valve portion 57, a magnetic attraction force that tends to affect the valve closing force can be provided.

The yoke-parallel portion and the plunger-parallel portion are portions that face each other in the axial direction and are perpendicular to the axial direction. According to this configuration, the magnetic attraction force can be applied in the direction perpendicular to the parallel portion, so it is possible to provide the fluid control valve 5 that can strengthen the attraction force.

The fluid control valve 5 includes a valve portion 57 that opens and closes the internal passage 512 so as to switch between an open state and a closed state, and on which the pressure of the working fluid acts in the direction of opening the valve. The fluid control valve 5 has a first path, which is a magnetic path along which magnetic flux passes between the plunger 55 and the yoke 56 . The fluid control valve 5 has a second path, which is a magnetic path along which magnetic flux passes between the plunger 55 and the yoke 56 at a location different from the first path. At the start of energization with the valve open, a magnetic path is formed in which the magnetic flux is greater in the first path than in the second path. In the valve closed state, 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, when energization is started in the valve open state, the driving force generated by the magnetic path passing through the first path can be used to start sucking the plunger 55 against the fluid pressure. Further, the plunger 55 can be sucked so as to maintain the closed state by using the driving force generated by the magnetic path passing through the second path in the process from the open state to the closed state of the valve portion 57 . The magnetic path through the first path becomes dominant at the start of energization in the valve open state. As a result, a driving force for moving the valve portion 57 in the valve-closing direction against the pressure of the working fluid can be obtained by exhibiting a suction force that attracts the plunger 55 toward the valve seat 511 side. Since the valve portion 57 can be closed while the fluid pressure is acting on the valve portion 57, it is possible to provide the fluid control valve 5 in which the energization timing is not limited.

In the closed state, the magnetic path through the second path becomes dominant. As a result, the internal passage 512 can be shut off by exerting the adsorption force that keeps the valve portion 57 in contact with the valve seat 511 . Due to this effect, the valve closing operation from the valve open state and the maintenance of the valve closed state can be performed without relying on the biasing force of a spring or the like. Therefore, it is possible to suppress an increase in the size of the device due to the provision of the spring and the strengthening of the biasing force. As described above, it is possible to provide the fluid control valve 5 capable of improving the valve closing performance when the valve is closed against the pressure of the working fluid and suppressing an increase in size.

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

According to this configuration, since the inclined portion 561 is provided, it is possible to form the first path having a larger magnetic flux than the second path passing through the parallel portions of the plunger 55 and the yoke 56 when the energization is started in the valve open state. In the process from the valve open state to the valve closed state, the parallel portion can switch to the second path where the overlapping area or contact area between the plunger 55 and the yoke 56 is large and the magnetic flux is large. Thus, the magnetic path is constructed by devising the shapes of the plunger 55 and the yoke 56 . Accordingly, it is possible to provide the fluid control valve 5 capable of performing the valve closing operation from the valve open state and maintaining the valve closed state without relying on the biasing force of a spring or the like.

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

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 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 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 contact each other when the valve is closed. According to this, the fluid control valve 5 can provide an adsorption force that closes the valve portion 57 against the fluid pressure acting on the valve portion 57, and can strengthen 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 a reduction in the number of parts of the device, and an air gap in the magnetic circuit can be reduced.

The fluid control valve 5 may be controlled to have the maximum voltage when energization is started in the open state (at the start of suction), and to be controlled to a lower voltage than at the start of suction when the suction is held in the closed state. . When this control is employed, the above-described first and second paths are formed. Thus, it is possible to provide the fluid control valve 5 that can satisfy the start of suction and the retention of suction even if the applied voltage is suppressed.

(Second embodiment)
A second embodiment will be described with reference to FIGS. 7 and 8. FIG. The fluid control valve 5 of the second embodiment differs from the first embodiment in the shape of the yoke 156 and the shape of the plunger 155 . Configurations, actions, and effects that are not specifically described in the second embodiment are the same as in the first embodiment, and only points that differ from the first embodiment will be described below. 7 and 8 do not show parts other than the plunger, the yoke and the coil for 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 valve portion 57 side end is connected to the upstream first annular portion 560 and the plunger 55 side end is coupled to the upstream second annular portion 562 . be.

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 an upstream (valve 57 side) end connected to the upstream annular portion 550 and an end on the plunger 55 side 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 cylindrical portion 1561 of the yoke 156 . The inclined portion 555 is formed such that the upstream end has a smaller diameter than the downstream end. Therefore, the inclined portion 555 is inclined with respect to the upstream cylindrical portion 1561 so that the diameter increases toward the downstream side.

The end of the inclined portion 555 on the upstream side or the valve portion 57 side is configured to have an outer diameter smaller than the inner diameter of the upstream cylindrical portion 1561 . The upstream cylindrical portion 1561 is provided so that the distance from the inclined portion 555 gradually decreases as the valve moves from the valve open state shown in FIG. 7 to the valve closed 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 cylindrical portion 1561 when energization is started in the valve open state shown in FIG. In this manner, in the valve open state, the magnetic flux in the magnetic path, which is the first path through which the magnetic flux passes between the inclined portion 555 and the upstream cylindrical portion 1561, is larger than that in the second path described above. In this way, when the valve is open, the first path forms a magnetic path with a larger magnetic flux than the second path. form a pathway. The upstream second annular portion 562 radially extends from the downstream end of the upstream cylindrical 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 that has a larger diameter than the downstream end of the upstream tubular portion 1561 and radially expands in a direction orthogonal to the downstream tubular portion 563 . .

Also in the fluid control valve 5 of the second embodiment, as shown in FIG. 7, when the valve is open when energized, the first path indicated by the solid line arrow becomes a more dominant magnetic path than the second path indicated by the broken line arrow. . This is because between the plunger 155 and the yoke 156, the inclined portion 555 and the upstream cylindrical portion 1561 are the shortest distance, the portion with the minimum magnetic resistance, and the portion with the maximum magnetic flux. Therefore, when the fluid control valve 5 is open, the suction force for sucking the plunger 155 is greater 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 that starts sucking in the first path. According to the fluid control valve 5 of the second embodiment, it is possible to enhance the suction performance at the start of energization.

When the open state shown in FIG. 7 approaches the closed state and the 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 first upstream annular portion 560 that are parallel to each other are in contact or 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 that combines the advantageous characteristics of attraction forces in both the first and second paths illustrated in FIG. there is

The first path of the second embodiment is a magnetic path through which the magnetic flux passes between the inclined portion, which is a part of one of the plunger and the yoke and has a cross-sectional shape that is inclined with respect to the other part, and the other part. . The second path is a magnetic path in which the magnetic flux passes through parallel portions of the plunger and the yoke that face each other in the axial direction and have cross-sectional shapes along each other. This parallel portion is composed of the upstream annular portion 550 of the plunger 155 and the upstream first annular portion 560 of the yoke 156 . According to this configuration, by providing the inclined portion 555, it is possible to form the 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 axially extending upstream tubular portion 1561 . The plunger 155 includes an inclined portion 555 having a cross-sectional shape that is inclined with respect to the upstream tubular portion 1561 . The parallel portion includes an upstream first annular portion 560 upstream of the upstream cylindrical portion 1561 of the yoke 156 and an upstream annular portion 550 of the plunger 155 upstream of the inclined portion 555 .

According to this configuration, the plunger 155 is provided with an inclined portion 555 with respect to the upstream cylindrical portion 1561 of the yoke 156 . Therefore, it is possible to increase the inner diameter of the portion of the plunger 155 provided on the downstream side of the inclined portion 555 . 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 maintenance performance of the closed state.

(Third embodiment)
A third embodiment will be described with reference to FIGS. 9 and 10. FIG. The fluid control valve 5 of the third embodiment differs from the first embodiment in that it has a plunger 155 . Configurations, actions, and effects that are not specifically described in the third embodiment are the same as those in the above-described embodiments, and only points that differ from the first and second embodiments will be described below. 9 and 10 do not show parts other than the plunger, the yoke, and the coil for easy understanding.

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

9, the distance between the plunger 155 and the yoke 56 on the upstream side is the shortest between the inclined portions 555 and 561 inclined with respect to the axial direction. The slanted portion 555 and the slanted portion 561 form parallel portions having cross-sectional shapes along each other. Thus, in the valve open state, the magnetic flux in the magnetic path, which is the first path through which the magnetic flux passes between the inclined portion 555 and the inclined portion 561, is larger than that in the above-described 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 form

Also in the fluid control valve 5 of the third embodiment, when the valve is open when energized, the first path indicated by solid line arrows becomes a more dominant magnetic path than the second path indicated by broken line arrows. This is because between the plunger 155 and the yoke 56, the inclined portion 555 and the inclined portion 561 are the shortest distance, the portion with the minimum magnetic resistance, and the portion with the maximum magnetic flux. According to the fluid control valve 5 of the third embodiment, the suction force for sucking the plunger 155 in the valve open state is greater in the first path than in the second path, 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 the structure 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 open state shown in FIG. 9 approaches the closed state and the 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 annular portion 550 and the first upstream annular portion 560 that are parallel to each other are close to or in contact with each other. Similar to the first embodiment, the fluid control valve 5 of the third embodiment provides a solenoid valve that combines the advantageous characteristics of attraction for both the first and second paths illustrated in FIG.

The first path of the third embodiment is a magnetic path in which the magnetic flux passes through the parallel portions of the plunger 155 and the yoke 56 that are inclined with respect to the axial direction and have cross-sectional shapes along each other. This parallel portion is formed by an inclined portion 555 and an inclined portion 561 . The second path is a magnetic path in which the magnetic flux passes through parallel portions of the plunger 155 and the yoke 56 that face each other in the axial direction and have cross-sectional shapes along each other. This parallel portion is formed by an upstream annular portion 550 and a first upstream 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 when energization is started in the valve open state. Further, the plunger 155 and the yoke 56 have parallel portions facing each other in the axial direction during the process of the valve portion 57 changing from the open state to the closed state. As a result, 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. In this manner, the plunger 155 and the yoke 56 are provided with a magnetic path that is devised in shape. Therefore, it is possible to provide the fluid control valve 5 capable of closing the valve from the open state and maintaining the closed state without relying on the biasing force of a spring or the like.

(Fourth embodiment)
A fourth embodiment will be described with reference to FIGS. 11 and 12. FIG. The fluid control valve 5 of the fourth embodiment differs from that of the second embodiment in that a plunger 255 and a yoke 256 are provided. Configurations, actions, and effects that are not specifically described in the fourth embodiment are the same as those in the above-described embodiments, and only differences from the first and second embodiments will be described below. 11 and 12 do not show parts other than the plunger, the yoke and the coil for easy understanding.

The fluid control valve 5 of the fourth embodiment shown in FIGS. 11 and 12 has a first path and a second path passing between the plunger 255 and the yoke 256 on both the 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 those of the fluid control valve 5 of the second embodiment on the valve portion 57 side, which is one end side in the axial direction. Thus, the fluid control valve 5 of the fourth embodiment has a plurality of second paths.

The plunger 255 has an inclined portion 556 that is inclined such that the surface of the outer peripheral edge of the downstream annular portion 552 increases 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 cylindrical portion 563 .

The downstream annular portion 564 radially extends from the downstream end of the downstream cylindrical 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 is provided at the downstream end, which is the other end in the axial direction, and has a cross-sectional shape that 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 slant portion 565 and the slant portion 556 constitute parallel portions having cross-sectional shapes along each other in the plunger 255 and the yoke 256, respectively.

The downstream annular portion 552 is provided at a position such that the upstream side surface 552b on the valve portion 57 side contacts the downstream side surface 564b in the valve closed state. The downstream side surface 564 b is a surface located on the side opposite to the valve portion 57 side in the downstream annular portion 564 . The downstream side surface 564b and the upstream side surface 552b are axially opposed portions and form parallel portions along each other. The downstream annular portion 552 corresponds to the 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 of the parallel portions 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 portions of the plunger 255 and the yoke 256, and the downstream annular portion 564 and the downstream annular portion 552 are connected. Magnetic flux passes between A portion between the inclined portion 565 and the downstream annular portion 552 corresponds to the first route. A portion 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, a first path and a second path are formed as in the second embodiment. 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 is closed from the open state shown in FIG. 11 to the closed state shown in FIG. 12, a reversal phenomenon occurs in which the second path becomes more dominant than the first path. This is because downstream annular portion 552 and downstream annular portion 564 that form parallel portions are in contact or closest downstream between plunger 255 and yoke 256 . On the downstream side, the portion between the downstream annular portion 552 and the downstream annular portion 564 has the smallest magnetic resistance and the largest magnetic flux. The fluid control valve 5 also changes downstream so that the suction force of the plunger 255 becomes greater in the second path immediately before the closed valve state with a small stroke, as in the characteristic diagram of FIG. The fluid control valve 5 has, on the downstream side, a configuration for attracting the valve portion 57 to the valve seat 511 through the second path. With this configuration, the valve portion 57 can be shut off against the fluid pressure acting on the valve portion 57, and the suction holding force when the valve is closed can be strengthened.

The plunger-parallel portion and the yoke-parallel portion are provided at both the ends on the upstream side of the plunger 55 and the yoke 56 on the one end side and the ends on the downstream side of the other end side. According to this configuration, the mechanism portion that strengthens the adsorption holding force of the plunger 55 and the yoke 56 can be installed at a location close to the valve portion 57 and at a location away from the valve portion 57 . Thereby, it is possible to provide a magnetic attraction force that tends to exert an influence on the valve closing force at two relatively distant locations.

The plunger parallel portion and the yoke parallel portion are provided at the ends of the plunger 55 and the yoke 56 on the other downstream side. According to this configuration, it is possible to provide a degree of design freedom that allows the mechanical portion that strengthens the adsorption holding force of the plunger 55 and the yoke 56 to be installed at a location distant from the valve portion 57 .

Between the plunger 255 and the yoke 256, the first path and the second path are provided at both the upstream one end and the downstream other end. According to the fourth embodiment, it is possible to provide an electromagnetic valve that has advantageous characteristics related to the attractive forces of both the first and second paths illustrated in FIG. 6 on both the upstream side and the downstream side.

In the valve closed state, the plunger 255 axially supports the valve support member on the upstream side and contacts the yoke-parallel portion of the yoke 256 on the downstream side. In the valve closed state, the plunger 255 axially supports the valve support member on the upstream side and contacts the yoke-parallel portions of the yoke 256 on the upstream and downstream sides. In this way, the plunger 255 has a plunger parallel portion that is separate from the portion that contacts the yoke parallel portion and the portion that axially supports the valve support member 58 .

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

(Fifth embodiment)
A fifth embodiment will be described with reference to FIGS. 13 and 14. FIG. The fluid control valve 5 of the fifth embodiment differs from that of the second embodiment in that a plunger 255 and a yoke 456 are provided. Configurations, actions, and effects that are not specifically described in the fifth embodiment are the same as those of the above-described embodiments. Only differences from the first, second, and fourth embodiments will be described below. 13 and 14 do not show parts other than the plunger, the yoke and the coil for easy understanding.

The fluid control valve 5 shown in FIGS. 13 and 14 has a first path and a second path passing between the plunger 255 and the yoke 456 on both the 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 those of the fluid control valve 5 of the second embodiment on the valve portion 57 side or upstream side, which is one end side in the axial direction. Thus, the fluid control valve 5 of the fifth embodiment has a plurality of second paths.

The configuration of the plunger 255 is the same as described in 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 tubular portion 563 . The downstream end tubular portion 567 has a cross-sectional shape that is provided at the end portion on the downstream side, which is the other end side in the axial direction, and extends in the axial direction. The downstream annular portion 564 radially extends from the downstream end of the downstream cylindrical portion 563 and is integrated with the downstream end cylindrical 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 cylindrical 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 ends of the plunger 255 and the yoke 456 . At the upstream end of the plunger 255 and the yoke 456, a first path and a second path are formed as in the second embodiment. 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 cylindrical portion 567 .

When the valve is closed from the open state shown in FIG. 13 to the closed state shown in FIG. 14, 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 that form 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 has the smallest magnetic resistance and 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 cylindrical portion 567 .

In the downstream side of the fluid control valve 5, the suction force of the plunger 255 changes so that the suction force of the plunger 255 becomes larger in the second path immediately before the closed state with a small stroke, as in the characteristic diagram of FIG. The fluid control valve 5 has a structure on the downstream side that attracts the valve portion 57 to the valve seat 511 through the second path. As a result, the valve portion 57 can be shut off against the fluid pressure acting on the valve portion 57, so that the suction holding force when the valve is closed can be strengthened.

The first path and the second path are provided at both the upstream one end and the downstream other end between the plunger 255 and the yoke 456 . According to the fifth embodiment, it is possible to provide an electromagnetic valve that has advantageous characteristics related to the attractive forces of both the first path and the second path illustrated in FIG. 6 on both the upstream side and the downstream side.

In the fluid control valve 5 of the fifth embodiment, the second paths are set at a plurality of sites. At least one of the second paths set in the plurality of parts is preferably formed in a part where the plunger 255 and the yoke 456 are in contact with each other when the valve is closed. According to this configuration, it is possible to provide the suction force that closes the valve portion 57 against the fluid pressure acting on the valve portion 57, so that the suction holding force when the valve is closed can be strengthened.

(Sixth embodiment)
A sixth embodiment will be described with reference to FIGS. 15 and 16. FIG. The fluid control valve 5 of the sixth embodiment differs from the fluid control valve 5 of the second embodiment in that a plunger 355 is provided. Configurations, actions, and effects that are not specifically described in the sixth embodiment are the same as those of the above-described embodiments. Only differences from the first embodiment and the second embodiment will be described below. For ease of understanding, FIGS. 15 and 16 do not show parts other than the plunger, yoke and coil.

As shown in FIGS. 15 and 16, the fluid control valve 5 of the sixth embodiment forms a magnetic path with the plunger 355 and the yoke 156 of the second embodiment. The fluid control valve 5 of the sixth embodiment has first paths passing between the plunger 355 and the yoke 156 on both the 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 those of 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 has a downstream end cylindrical portion 557 provided at the downstream end, which is the other end in the axial direction. The downstream end tubular portion 557 has a cross-sectional shape extending downstream from the outer peripheral edge of the downstream annular portion 552 . The downstream end tubular portion 557 is axially inclined with respect to the tubular portion 551 or the downstream annular portion 552 so that the diameter increases toward the downstream side.

The configuration of the yoke 156 is the same as described in 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 tubular portion 563 of the yoke 156, and constitutes an 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 cylindrical portion 563 and the downstream end cylindrical portion 557 at the downstream end of the plunger 355 and the yoke 156 . pass. A first path and a second path are formed at the upstream ends of the plunger 355 and the yoke 156 in the same manner as in the second embodiment. 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 .

From the open state shown in FIG. 15 to the closed state, the distance between the downstream side tubular portion 563 and the downstream end tubular portion 557 becomes smaller when the valve closed state shown in FIG. 16 is reached. Therefore, in the valve closed state, the magnetic flux passing between the downstream tubular portion 563 and the downstream end tubular portion 557 is larger than in the valve open state. On the downstream side, the portion between the downstream tubular portion 563 and the downstream end tubular portion 557 has the lowest magnetic resistance and the largest magnetic flux.

(Seventh embodiment)
A seventh embodiment will be described with reference to FIGS. 17 and 18. FIG. The fluid control valve 5 of the seventh embodiment differs from the fluid control valve 5 of the second embodiment in that it includes the yoke 456 of the fifth embodiment. Configurations, actions, and effects that are not specifically described in the seventh embodiment are the same as those in the above-described embodiments, and points that differ from the first, second, fourth, and fifth embodiments will be described below. Only about 17 and 18 do not show parts other than the plunger, the yoke and the coil for easy understanding.

The fluid control valve 5 of the seventh embodiment shown in FIGS. 17 and 18 has a first path and a second path passing between the plunger 155 and the yoke 456 on both the one end side and the other end side in the axial direction. Prepare. The plunger 155 and the yoke 456 have a first path and a second path similar to those of 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 described in the second embodiment, and the configuration of the yoke 456 is the same as described in the fifth embodiment.

17, the magnetic flux passes through the first path between the downstream annular portion 552 and the downstream cylindrical 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 cylindrical portion 567 . At the upstream end of the plunger 155 and the yoke 456, a first path and a second path are formed as in the second embodiment.

When the closed state shown in FIG. 18 is reached after the open state shown in FIG. 17 is brought closer to the closed state, a reversal phenomenon occurs in which the second path becomes more dominant than the first path. This is because downstream annular portion 552 and downstream annular portion 564 that form parallel portions are in contact or closest downstream between plunger 255 and yoke 456 . On the downstream side, the portion between the downstream annular portion 552 and the downstream annular portion 564 has the smallest magnetic resistance and the largest magnetic flux.

In the downstream side of the fluid control valve 5, the suction force of the plunger 155 changes so that the suction force of the plunger 155 becomes larger in the second path immediately before the closed state with a small stroke, as in the characteristic diagram of FIG. The fluid control valve 5 of the seventh embodiment has a structure on the downstream side that attracts the valve portion 57 to the valve seat 511 through the second path. As a result, the valve portion 57 can be shut off against the fluid pressure acting on the valve portion 57, so that the suction holding force when the valve is closed can be strengthened.

The first path and the second path of the seventh embodiment are provided at both the end on the upstream side and the other end on the downstream side between the plunger 155 and the yoke 456. ing. According to the seventh embodiment, it is possible to provide an electromagnetic valve that has advantageous characteristics related to the attractive forces of both the first and second paths shown in FIG. 6 on both the upstream side and the downstream side.

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

(Other embodiments)
The disclosure in this specification is not limited to the illustrated embodiments. The disclosure encompasses the illustrated embodiments and variations therefrom by those skilled in the art. For example, the disclosure is not limited to the combination of parts and elements shown in the embodiments, and various modifications can be made. The disclosure can be implemented in various combinations. The disclosure can have additional parts that can be added to the embodiments. The disclosure encompasses abbreviations of parts and elements of the embodiments. The disclosure encompasses the permutations, or combinations of parts, elements between one embodiment and another. The disclosed technical scope is not limited to the description of the embodiments. The disclosed technical scope is indicated by the description of the claims, and should be understood to include all changes within the meaning and range of equivalents to the description of the claims.

The fluid control valve 5 capable of achieving the purpose described in the specification is not limited to a configuration including a yoke parallel portion and a plunger parallel portion that are orthogonal to the axial direction. An achievable fluid control valve 5 includes, for example, a configuration comprising a yoke parallel portion and a plunger parallel portion that intersect obliquely 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 in the first and third embodiments. 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.

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

In the above embodiment, the valve portion 57 is a member attached to the valve portion support member 58 driven by the plunger 55, but the fluid control valve is not limited to this form. For example, the valve portion 57 may be a member provided integrally 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 whose duty ratio, which is the ratio of the ON time to the time of one cycle consisting of the ON time and OFF time of energization, is controlled by the controller 8 . According to such energization control for the fluid control valve 5, it is possible to freely adjust the flow rate of the cooling water flowing through the second flow path 11. FIG.

The fluid control valve 5 capable of achieving the purpose disclosed in the specification is not limited to an electromagnetic valve capable of controlling the flow rate of 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 an electromagnetic valve that controls the flow rate of a working fluid that can cool motors, inverters, semiconductor devices, and the like. The fluid control valve 5 can be used, for example, as an electromagnetic valve that controls the flow rate of working fluid used for cooling or heating, or as an electromagnetic valve that controls the flow of hydraulic oil such as automatic oil.

5... Fluid control valve, 51... Inflow side housing (housing)
55, 155, 255, 355 Plunger 56, 156, 256, 456 Yoke 57 Valve portion 58 Valve portion support member 511 Valve seat 512 Internal passage 540 Coil portion 550 Upstream annular portion ( Parallel part, plunger parallel part, moving side upstream annular part)
551... Cylindrical part, 552... Downstream annular part (parallel part, plunger parallel part)
553 Fluid passage 560 First upstream annular portion (parallel portion, parallel yoke portion, fixed upstream annular portion)
564... Downstream side parallel portion (parallel portion, yoke parallel portion)

Claims (12)

a housing (51) having an internal passageway (512) through which a working fluid flows;
a valve part (57) that opens and closes the internal passage so as to switch between an open state that permits circulation of the working fluid and a closed state that blocks circulation of the working fluid;
a valve support member (58) to which the valve is attached or of which the valve is a part;
a plunger (55; 155; 255; 355) which is a member separate from the valve support member and axially drives the valve support member;
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) fixedly installed and forming a magnetic circuit with said plunger when said energized;
Parallel portions (550, 560; 552) which are provided in the plunger and the yoke so as to form a magnetic path through which the magnetic flux passes between the plunger and the yoke, and are portions facing each other and having cross-sectional shapes along each other. , 564) and
with
In the valve closed state, the plunger parallel portion, which is one of the parallel portions, is in contact with the yoke parallel portion, which is the other parallel portion, or is in direct contact via an interposition so as to form a magnetic path, and The fluid control valve, wherein the plunger is in contact with the valve support member in the axial direction or indirectly through an interposition. a 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 location 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 forms a magnetic path that is greater than the first path. 2. The fluid control valve according to claim 1, wherein the magnetic flux also forms a magnetic path with a large magnetic flux. In a state where fluid pressure is not acting 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 2. The fluid control valve according to claim 1, wherein the closed state is achieved by contacting the valve directly. In the closed state in which the valve portion and valve seat (511) are in close contact, the plunger parallel portion contacts the yoke parallel portion or indirectly contacts the yoke parallel portion via the interposition so as to form a magnetic path. 2. The fluid control valve according to claim 1, wherein said plunger is in axial or indirect contact with said valve support member. 2. The fluid control valve according to claim 1, wherein in the valve closed state, the valve support member is supported in the axial direction by the parallel portion of the plunger. 6. The fluid control valve according to claim 5, wherein the plunger parallel portion is in contact with the yoke parallel portion and the valve support member on the same plane. The plunger comprises a tubular portion (551) extending in the axial direction,
The plunger parallel portion includes a movable upstream annular portion extending to intersect the cylindrical portion and provided on the plunger upstream of the working fluid from the cylindrical 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 upstream of the working fluid from 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 perpendicular to the axial direction. The plunger-parallel portion and the yoke-parallel portion are both the ends on the upstream side of the working fluid and the other ends on the downstream side of the working fluid in the plunger and the yoke. 6. The fluid control valve according to any one of claims 1 to 5, provided in the. 6. The plunger parallel portion and the yoke parallel portion are provided at ends of the plunger and the yoke on the other end side downstream of the working fluid. A fluid control valve as described in . The fluid control valve according to any one of claims 1 to 10, comprising a fluid passage (553) through which the working fluid flows inside the plunger. 11. The fluid control valve according to any one of claims 1 to 10, further comprising a fluid passage (553) inside the plunger and inside the coil portion, through which the working fluid flows.

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