JP7358754B2 - fluid control valve - Google Patents

Description

The disclosure herein relates to fluid control valves.

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

Patent No. 5811797

In the on-off valve disclosed in Patent Document 1, when the valve is closed, the valve body is brought into contact with the valve seat by the adsorption force of the solenoid and the urging force of the urging member. When the valve is opened, the electric power to the solenoid 75 is turned off, and the electric pump is controlled so that the pressure applied to the valve body by the refrigerant exceeds the biasing force of the biasing member. In this on-off valve, it is necessary to appropriately control the output of the electric pump and the urging force of the urging member so that the valve body does not violently collide with the valve seat or bearing. In addition, if the biasing member is not provided, there is a risk that the valve body may collide with the bearing portion due to sudden changes in flow rate and the like, resulting in generation of tapping noise.

An object of the disclosure in this specification is to provide a fluid control valve that can attenuate the operation of a plunger when opening and closing a valve portion.

The multiple embodiments disclosed in this specification employ different technical means to achieve their respective objectives. Furthermore, the claims and the reference numerals in parentheses described in this section are examples of correspondences with specific means described in the embodiments described later as one aspect, and are intended to limit the technical scope. isn't it.

One of the disclosed fluid control valves includes a housing (51) having an internal passageway (512) through which a working fluid flows, and a valve state in which the working fluid is allowed to flow and a closed state in which the working fluid is prevented from flowing. a valve part (57) that opens and closes the internal passage so as to switch the valve part, a plunger (55; 155; 255) that drives the valve part in the axial direction, and a plunger (55; 155; A coil part (540) that generates a magnetic force that drives the plunger in the direction; a yoke (56) that forms a magnetic circuit together with the plunger when energized; A first chamber section provided such that when the volume of one chamber section increases, the volume of the other chamber section decreases, and when the volume of the other chamber section increases, the volume of one chamber section decreases in response to axial displacement. (59) and a second chamber part (60),
During the valve opening process in which the plunger is displaced from the valve closed state to the valve open state, working fluid flows out from the second chamber part and working fluid flows into the first chamber part, and the plunger is displaced from the valve open state to the valve closed state. In the valve closing process, the working fluid flows out from the first chamber part and the working fluid flows into the second chamber part,
The second chamber portion is provided so as to communicate with the internal passageway during the valve opening process and the valve closing process except for the valve closing state,
The first chamber section and the second chamber section are always in communication through the communication passage during the valve-closing state, the valve- opening process, and the valve-closing process .
Further, one of the disclosed fluid control valves includes a housing (51) having an internal passageway (512) through which the working fluid flows, an open state that allows the working fluid to flow, and a closed state that prevents the working fluid from flowing. a valve part (57) that opens and closes the internal passage to switch between the open and closed states; a plunger (55; 155; 255) that drives the valve part in the axial direction; A coil part (540) that generates a magnetic force that drives the plunger in the axial direction, a yoke (56) that forms a magnetic circuit together with the plunger when energized, and a chamber part that contains a working fluid inside the housing, The first chamber is provided so that when the volume of one chamber part increases, the volume of the other chamber part decreases, and when the volume of the other chamber part increases, the volume of one chamber part decreases according to the axial displacement of the plunger. A chamber part (59) and a second chamber part (60),
In the valve opening process in which the plunger is displaced from the valve closed state to the valve open state, working fluid flows out from the second chamber part and working fluid flows into the first chamber part,
In the valve closing process in which the plunger is displaced from the valve open state to the valve closed state, working fluid flows out from the first chamber part and working fluid flows into the second chamber part,
A communication passageway (601) that communicates a fluid passageway (553) provided inside the plunger with the second chamber part,
The working fluid flowing out from the second chamber part during the valve opening process flows into the fluid passage through the communication passage,
The working fluid flowing out of the fluid passage during the valve closing process flows into the second chamber portion through the communication passage.
Further, one of the disclosed fluid control valves includes a housing (51) having an internal passageway (512) through which the working fluid flows, an open state that allows the working fluid to flow, and a closed state that prevents the working fluid from flowing. a valve part (57) that opens and closes the internal passage to switch between the open and closed states; a plunger (55; 155; 255) that drives the valve part in the axial direction; A coil part (540) that generates a magnetic force that drives the plunger in the axial direction, a yoke (56) that forms a magnetic circuit together with the plunger when energized, and a chamber part that contains a working fluid inside the housing, The first chamber is provided so that when the volume of one chamber part increases, the volume of the other chamber part decreases, and when the volume of the other chamber part increases, the volume of one chamber part decreases according to the axial displacement of the plunger. A chamber part (59) and a second chamber part (60),
In the valve opening process in which the plunger is displaced from the valve closed state to the valve open state, working fluid flows out from the second chamber part and working fluid flows into the first chamber part,
In the valve closing process in which the plunger is displaced from the valve open state to the valve closed state, working fluid flows out from the first chamber part and working fluid flows into the second chamber part,
A communication passage (531) is provided that communicates the internal passage of the outflow port (530) with the second chamber part,
The working fluid flowing out from the second chamber part during the valve opening process flows into the internal passage of the outflow port through the communication passage;
The working fluid flowing out from the internal passage of the outflow port during the valve closing process flows into the second chamber portion through the communication passage.
Further, one of the disclosed fluid control valves includes a housing (51) having an internal passageway (512) through which the working fluid flows, an open state that allows the working fluid to flow, and a closed state that prevents the working fluid from flowing. a valve part (57) that opens and closes the internal passage to switch between the open and closed states; a plunger (55; 155; 255) that drives the valve part in the axial direction; A coil part (540) that generates a magnetic force that drives the plunger in the axial direction, a yoke (56) that forms a magnetic circuit together with the plunger when energized, and a chamber part that contains a working fluid inside the housing, The first chamber is provided so that when the volume of one chamber part increases, the volume of the other chamber part decreases, and when the volume of the other chamber part increases, the volume of one chamber part decreases according to the axial displacement of the plunger. A chamber part (59) and a second chamber part (60),
In the valve opening process in which the plunger is displaced from the valve closed state to the valve open state, working fluid flows out from the second chamber part and working fluid flows into the first chamber part,
In the valve closing process in which the plunger is displaced from the valve open state to the valve closed state, working fluid flows out from the first chamber part and working fluid flows into the second chamber part,
A communication passage (591; 552c; 1552c; 611) communicating the first chamber part and the second chamber part is provided,
The working fluid flowing out from the second chamber part during the valve opening process flows into the first chamber part through the communication passage,
During the valve closing process, the working fluid flowing out from the first chamber part flows into the second chamber part through the communication passage,
The communication passage is a passage having a predetermined length in the axial direction, and a passage width length in a direction perpendicular to the axial direction changes in the axial direction.

According to this fluid control valve, the kinetic energy of the plunger can be attenuated by the working fluid accommodated in the second chamber portion during the valve opening process. Furthermore, during the valve closing process, the kinetic energy of the plunger can be attenuated by the working fluid contained in the first chamber portion. Furthermore, since the working fluid flows into the first chamber during the valve opening process, the working fluid that can attenuate the kinetic energy of the plunger during the next valve closing process can be stored in the first chamber. Furthermore, since the working fluid flows into the second chamber during the valve closing process, the working fluid that can attenuate the kinetic energy of the plunger during the next valve opening process can be stored in the second chamber. As described above, it is possible to provide a fluid control valve that can attenuate the operation of the plunger when opening and closing the valve portion.

It is a block diagram showing the cooling water circuit concerning a 1st embodiment. FIG. 2 is a cross-sectional view showing the fluid control valve of the first embodiment in an open state. FIG. 2 is a cross-sectional view showing the fluid control valve of the first embodiment in a closed state. It is an enlarged view explaining the magnetic path between the yoke and the plunger in the valve open state. FIG. 3 is an enlarged view illustrating a magnetic path between a yoke and a plunger in a valve closed state. It is a characteristic diagram showing the relationship between stroke and suction force for the first route and the second route. It is a perspective view of the plunger in a 2nd embodiment. FIG. 7 is a plan view of the plunger of the second embodiment as viewed from the inflow port side. It is a perspective view of the plunger in a 3rd embodiment. FIG. 7 is a plan view of a plunger according to a third embodiment, viewed from the inflow port side. It is a sectional view showing a valve open state about a fluid control valve of a 4th embodiment. It is a sectional view showing a closed state of a fluid control valve of a 4th embodiment. It is a sectional view showing a valve open state about a fluid control valve of a 5th embodiment. FIG. 3 is a partially enlarged view showing the inflow and outflow of working fluid in the valve open state. It is a sectional view showing a closed state of a fluid control valve of a 5th embodiment. It is a partially enlarged view showing the inflow and outflow of working fluid in a valve closed state. It is a sectional view showing a valve open state about a fluid control valve of a 6th embodiment. It is a sectional view showing a valve closed state about a fluid control valve of a 6th embodiment.

Hereinafter, a plurality of embodiments for carrying out the present disclosure will be described with reference to the drawings. In each form, parts corresponding to matters explained in the preceding form may be given the same reference numerals and redundant explanation may be omitted. When only a part of the configuration is described in each form, the other forms previously described can be applied to other parts of the structure. Not only combinations of parts that specifically indicate that combinations are possible in each embodiment, but also partial combinations of embodiments even if it is not explicitly stated, as long as there is no particular problem with the combination. It 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. 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, gas, water, or liquid such as 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 a 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, etc. We are prepared.

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 includes 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, for example, by a microcomputer with a computer-readable storage medium. A storage medium is a non-transitory tangible storage medium that non-temporarily stores a computer readable program. 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, thereby causing 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 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 of hardware, software, or both.

The pump 3 is a device that operates in conjunction 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 in operation, and does not operate when the engine 2 is stopped. As the pump 3, for example, a mechanical variable flow rate pump operated by the 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 started and stopped regardless of the operating state of the engine 2. In this case, the pump 3 can change the amount of fluid it discharges under the control of the control device 8.

The first flow path 10 is a flow path through which 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 through which fluid circulates through the engine 2, the switching valve 4, and the pump 3 without passing through the heater core 6 or the radiator 7. A flow path through which cooling water flows is formed inside the engine 2. The cooling water flowing inside the engine 2 absorbs the heat of the engine 2 and increases its own temperature, thereby lowering the internal temperature of the engine 2. The second flow path 11 is a flow path that branches 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. It is 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, which is 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 a 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 the 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, 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 thermostatic valve. The opening degree of the switching valve 4 changes depending on the amount of heat applied to the temperature-sensitive wax or the temperature of the cooling water.

The fluid control valve 5 is a valve that is provided upstream or downstream of the heater core 6 in the second flow path 11 and whose opening degree can be switched between two states: a closed state and an open state. When the fluid control valve 5 is in the closed state, the cooling water does not flow into the second flow path 11 but flows only into the first flow path 10 in the first state. When the fluid control valve 5 is in the open state, the cooling water flows into 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 to 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 starting the engine 2, if the cooling water temperature is lower than a predetermined first temperature, the switching valve 4 maintains the first state, and the control device 8 controls the fluid control valve 5 to close. Since the cooling water circulates only through the first flow path 10, warming up of the engine 2 is promoted.

When the coolant temperature reaches the first temperature or higher, the warm-up control of the engine 2 is ended. When the cooling water temperature reaches 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 heat is radiated from the cooling water in the radiator 7. When the control device 8 shuts off the power supply and controls the fluid control valve 5 to open, the cooling water circulates through the second flow path 11 and heat is radiated from the cooling water in the heater core 6 as well. Further, in the first state, if heat dissipation from the cooling water is required in the heater core 6, the control device 8 may cut off the power supply and control the fluid control valve 5 to the open state.

Alternatively, the above-mentioned cooling water circuit 1 may be configured to have only a path for the fluid flowing out from the engine 2 to return to the engine via the heater core 6 and the radiator 7. That is, the cooling water circuit 1 may have a configuration in which the first flow path 10 is not provided. The control device 8 may be configured to control the fluid control valve 5 based on a detected value of a sensor that detects the engine oil temperature or the oil temperature of a transmission or the like.

The fluid control valve 5 will be explained using FIGS. 2 to 6. FIG. 2 shows the valve in the open state, and FIG. 3 shows the valve in the 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 having a configuration in which 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. In other words, the fluid control valve 5 is an electromagnetic valve device in which the valve portion 57 is closed in a direction that opposes fluid pressure. The fluid control valve 5 opens and closes an internal passage 512 provided in the housing depending on 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 whose closing direction is opposite to the pressure acting direction of the working fluid flowing therethrough, and which switches between an open state in which a fluid passage is opened and a closed state in which the fluid passage is closed.

The valve support member 58 and the plunger 55 are separate members. The valve support member 58 and the plunger 55 are not fixed to each other. The plunger 55 includes a cylindrical portion 551 that is open at both axial ends. The plunger 55 includes an upstream annular portion 550 provided at one end of a cylindrical portion 551 on the valve portion 57 side, and a downstream annular portion 552 provided at the other end of the cylindrical 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 direction in which the plunger 55 and the valve portion 57 move. The valve 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 support member 58 in the axial direction without directly contacting the valve support member 58. In this case, the upstream annular portion 550 is in indirect contact with the valve support member 58 via the inclusion. Further, the upstream annular portion 550 and the valve support member 58 may have a configuration in which there is a state in which they do not contact each other during the process between the valve open state and the valve closed state. In this case, the upstream annular portion 550 and the valve support member 58 transition from a state in which they are separated to a state in which they directly or indirectly contact each other in the valve closed state. The upstream annular portion 550 is configured to support the valve support member 58 at least in the valve closed state.

The downstream annular portion 552 is a flange-like portion that has a larger diameter than the cylindrical portion 551 and radially extends in a direction perpendicular to the cylindrical portion 551 . The downstream annular portion 552 is provided with a downstream opening coaxial with the cylindrical portion 551 inside. A fluid passage 553 is provided inside the cylindrical portion 551 . The fluid passage 553 has an upstream opening 550a as a fluid inlet. The plunger 55 is made of a material that conducts magnetism, for example, a magnetic material.

The valve part support member 58 is configured integrally with the valve part 57 by being coupled with the valve part 57. The valve support member 58 includes an upstream cylindrical portion 582, an upstream plate portion 580, and a downstream cylindrical portion 583. The upstream disk portion 580 is a disk-shaped portion that is integrally provided at the upstream end of the upstream cylindrical portion 582. A valve section 57 is attached to the upstream side panel section 580. The upstream cylindrical portion 582 is provided with a fluid passage 581 that penetrates in the radial direction. The upstream cylindrical portion 582 is provided with at least one fluid passage 581 . 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 cylindrical portion 583 is integrally provided at the downstream end of the upstream cylindrical portion 582 and has a smaller diameter than the upstream cylindrical portion 582. The downstream cylindrical portion 583 is inserted into an opening 560 a provided in the first upstream annular portion 560 of the yoke 56 and is supported so as to be slidable in the axial direction. In the valve opening 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 can be displaced within a predetermined range in the axial direction by the yoke 56, and is restricted to be almost impossible to move in the radial direction. The valve support member 58 is made of a material that is difficult to conduct magnetism, such as a resin material. Therefore, the valve support member 58 is configured 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 with the shaft portion extending downstream in the axial direction fitting into the through hole of the upstream plate portion 580. The valve portion 57 is provided at a position axially opposed to 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 the working fluid. The housing main 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 inflow side housing 51 is provided integrally with the intermediate housing 52 on the downstream side, 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 around the inflow port 510 on which the valve portion 57 that is displaced in the valve closing direction is seated. In the closed state, the valve seat 511 preferably contacts the valve portion 57 so as to form an annular surface or an annular line.

The outflow side housing 53 is provided with an outflow port 530. The upstream side of the outflow side housing 53 is integrally provided with the intermediate housing 52. Outflow port 530 communicates with fluid passageway 553 at its upstream end. The inflow side housing 51, the intermediate housing 52, and the outflow side housing 53 are made of resin material and welded to each other.

The intermediate housing 52 includes 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 within 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 constitutes a 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 to cover the outer periphery 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 cylindrical 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 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 hardly allows magnetic flux to pass through.

The electromagnetic solenoid section 54 includes a yoke 56, a coil section 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 supply electricity to the coil portion 540. A terminal terminal inside the connector is electrically connected to the coil section 540. The electromagnetic solenoid section 54 can control the current flowing through the coil section 540 by electrically connecting the terminal terminal to a current control device or the like using a connector. The bobbin 541 is formed of a resin material into a cylindrical shape, and has a coil portion 540 wound around its outer peripheral surface. The coil portion 540 generates a magnetic force that drives the plunger 55 in the axial direction when energized to switch between the valve open state and the valve closed state.

The yoke 56 is a cylindrical body with both axial ends open. The yoke 56 includes a first upstream annular portion 560, an inclined portion 561, a second upstream annular portion 562, and a downstream cylindrical portion 563. The first upstream 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 able to contact the upstream annular portion 550 of the plunger 55 in the axial direction. The first upstream annular portion 560 has an opening 560a as a through hole, which has a larger diameter than the upstream annular portion 550 and is coaxial with the upstream opening 550a of the plunger 55.

The first upstream annular portion 560 and the upstream annular portion 550 are parallel portions that face each other in the axial direction and have cross-sectional shapes along each other. Hereinafter, the cross-sectional shape relating to the inclined portion and the parallel portion refers to 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 closed state. The valve closed state is a state in which the internal passage 512 is closed so as to prevent the flow of working fluid. The valve closed state includes not only a state where the valve portion 57 and the valve seat 511 are in contact with each other, but also a state where the valve portion 57 and the valve seat 511 are not in contact with each other but prevent the flow of working fluid.

The downstream side surface 560b and the upstream side surface 550b are portions that face each other in the axial direction and form parallel portions that extend 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 the portion where the first upstream annular portion 560 and the upstream annular portion 550 contact. The upstream annular portion 550 corresponds to a plunger parallel portion that is one of the parallel portions in the valve closed state. The first upstream annular portion 560 corresponds to the yoke parallel portion, which is the other parallel portion in the valve closed state. The first upstream annular portion 560 and the upstream annular portion 550 are portions that face each other in the axial direction and are perpendicular to the axial direction. The upstream annular portion 550 is a movable upstream annular portion that extends to intersect with the cylindrical portion 551 and is provided on the plunger 55 on the upstream side of the working fluid from the cylindrical portion 551. The first upstream annular portion 560 is a fixed upstream annular portion provided on the yoke 56 on the upstream side of the working fluid than the movable upstream annular portion.

The upstream annular portion 550 and the first upstream annular portion 560 may have a configuration in which they do not directly contact each other in the valve closed state. In this case, the upstream annular portion 550 is in indirect contact with the first upstream annular portion 560 via the inclusion so as to form a magnetic path through the inclusion. 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 cylindrical portion having a shape in which an end on the valve portion 57 side is connected to the first upstream annular portion 560 and an end on the plunger 55 side is connected to the second upstream 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 cylindrical portion 551 of the plunger 55. The sloped portion 561 is formed so that its upstream end has a smaller diameter than its downstream end. Therefore, the inclined part 561 is inclined with respect to the cylindrical part 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 is configured to have a larger diameter than 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. At the start of energization with the valve open, 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 cylindrical portion 551. In this way, in the valve open state, the magnetic flux is greater in the first magnetic path, which is the magnetic flux path, between the inclined portion 561 and the cylindrical portion 551 than in the aforementioned second path. At the start of energization in the valve open state, the first path forms a magnetic path with larger magnetic flux than the second path, and in the valve closed state, the second path forms a magnetic path with larger magnetic flux than the first path. do.

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

As shown in FIG. 6, the suction force that attracts 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 suction force has a characteristic that a reversal phenomenon occurs immediately before the valve is closed, and the second path becomes larger than the first path in the valve closed state. In the valve open state during energization shown in FIG. 4, the first path indicated by the solid line arrow becomes a more dominant magnetic path than the second path shown by the broken line arrow. This is because, between the plunger 55 and the yoke 56, the inclined part 561 and the cylindrical part 551 are the shortest distance, the part with the minimum magnetic resistance, and the part with the maximum magnetic flux. Therefore, in the fluid control valve 5, in the open state with a large stroke, the suction force that attracts the plunger 55 is larger in the first path than in the second path, as in the characteristic diagram of FIG. By adopting a configuration in which suction starts in the first path, the fluid control valve 5 can suction the plunger 55 against the fluid pressure acting on the valve portion 57. Therefore, the fluid control valve 5 can strengthen the suction performance at the time of starting energization.

As the valve approaches the closed state from the open state shown in FIG. 4 and reaches the closed state shown in FIG. 5, 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, which are parallel to each other, are in contact with each other or are closest to each other between the plunger 55 and the yoke 56. Therefore, the region between the upstream annular portion 550 and the first upstream annular portion 560 is the region where the magnetic resistance is the smallest and the magnetic flux is the largest. 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 close state where the stroke is small. The fluid control valve 5 can close off the valve part 57 against fluid pressure acting on the valve part 57 by adopting a configuration in which the valve part 57 is attracted to the valve seat 511 through the second path. Therefore, the suction holding force when the valve is closed can be strengthened. As described above, the fluid control valve 5 provides an electromagnetic valve that has advantageous characteristics regarding the suction force of both the first path and the second path shown in FIG. 6.

In the open state shown in FIG. 2, the fluid control valve 5 includes a first chamber portion 59 formed between the downstream annular portion 552 of the plunger 55 and the bobbin 541 that face each other in the axial direction. In the open state, the first chamber portion 59 is filled with working fluid. The first chamber portion 59 is a space sandwiched between the bobbin 541 and the downstream annular portion 552 which are spaced apart from each other in the axial direction on the radially outer side of the cylindrical portion 551 of the plunger 55 . The first chamber portion 59 forms a donut-shaped space within the intermediate housing 52 that is partitioned by the downstream annular portion 552, the cylindrical portion 551, and the bobbin 541.

In the closed state shown in FIG. 3, the fluid control valve 5 includes a second chamber portion 60 formed between the housing and the downstream annular portion 552 that face each other in the axial direction. The second chamber portion 60 and the first chamber portion 59 are formed to sandwich the downstream annular portion 552 from both sides in the axial direction. The first chamber portion 59 is located on the valve portion 57 side or upstream side of the second chamber portion 60 in the axial direction.

In the closed state, the second chamber section 60 is filled with working fluid. The second chamber portion 60 is a space sandwiched between the housing and a downstream annular portion 552 that is radially outer than the outflow port 530 and spaced apart in the axial direction within the intermediate housing 52 . The second chamber portion 60 forms a donut-shaped space within the intermediate housing 52 that is partitioned by the downstream annular portion 552 and the housing.

The first chamber section 59 and the second chamber section 60 communicate with each other through a communication passage 591 in the valve open state and the valve closed state. The communication passage 591 is a gap formed between the downstream cylindrical portion 563 or the housing of the yoke 56 and the outer peripheral edge of the downstream annular portion 552. The communication passage 591 is an annular gap provided along the outer circumferential edge of the downstream annular portion 552 over the entire outer circumference. The communication passage 591 has a small passage cross-sectional area with respect to the first chamber part 59 and the second chamber part 60, and has a fluid-dynamic orifice-like effect.

When the plunger 55 shifts from the closed state in FIG. 3 to the open state in FIG. 2, the fluid filling the second chamber portion 60 exhibits a damper function. This function suppresses the moving speed of the plunger 55 in the valve opening direction, thereby suppressing the collision load between the plunger 55 and the housing. When the valve is shifted from the closed state to the open state, the working fluid moves as shown by the broken line arrow in FIG. 2 . The fluid filling the second chamber section 60 flows out to the first chamber section 59 through the communication passage 591 as the volume of the first chamber section 59 increases and the pressure decreases.

When the plunger 55 shifts from the open state shown in FIG. 2 to the closed state shown in FIG. 3, the fluid filling the first chamber portion 59 exhibits a damper function. With this function, the moving speed of the plunger 55 in the valve closing direction is suppressed, and the collision load between the upstream annular portion 550 and the first upstream annular portion 560 can be suppressed. Alternatively, this function can suppress the collision load between the valve portion 57 and the valve seat 511. When the valve is shifted from the open state to the closed state, the working fluid moves as shown by the broken line arrow in FIG. At this time, the fluid filling the first chamber section 59 flows out to the second chamber section 60 through the communication passage 591 as the volume of the first chamber section 59 decreases and the pressure increases. As described above, the fluid in the first chamber portion 59 and the fluid in the second chamber portion 60 damp the movement of the plunger 55 by alternately repeating the valve open state and the valve closed state. Furthermore, the action of the fluid flowing back and forth between the first chamber part 59 and the second chamber part 60 through the communication passage 591 contributes to the continuous performance of the damper function described above.

Next, the effects brought about by the fluid control valve 5 of the first embodiment will be explained. The fluid control valve 5 includes a first chamber part 59 and a second chamber part 60, each of which accommodates a working fluid inside the housing. In response to the axial displacement of the plunger 55, when the volume of one chamber part increases, the volume of the other chamber part decreases, and when the volume of the other chamber part increases, the volume of one chamber part decreases. . In the valve opening process in which the plunger 55 is displaced from the valve closed state to the valve open state, working fluid flows out from the second chamber section 60 and flows into the first chamber section 59. In the valve closing process in which the plunger 55 is displaced from the valve open state to the valve closed state, working fluid flows out from the first chamber portion 59 and flows into the second chamber portion 60.

According to this configuration, the kinetic energy of the plunger 55 can be attenuated by the working fluid accommodated in the second chamber section 60 during the valve opening process. Furthermore, during the valve closing process, the kinetic energy of the plunger 55 can be attenuated by the working fluid contained in the first chamber portion 59. Since the working fluid flows into the first chamber part 59 during the valve opening process, the working fluid that can attenuate the kinetic energy of the plunger 55 can be prepared in the first chamber part 59 during the next valve closing process. Since the working fluid flows into the second chamber part 60 during the valve closing process, the working fluid that can attenuate the kinetic energy of the plunger 55 can be prepared in the second chamber part 60 during the next valve opening process. As described above, this fluid control valve 5 can attenuate the operation of the plunger 55 when the valve portion 57 is opened and closed.

The first chamber section 59 and the second chamber section 60 are installed coaxially with respect to a fluid passage 553 provided inside the plunger 55. Coaxial means that the first chamber section 59 and the second chamber section 60 are provided coaxially or substantially coaxially with respect to the fluid passage 553. This configuration contributes to the ability to set the range occupied by the first chamber section 59 and the second chamber section 60 so that it does not become larger in the radial direction with respect to the fluid passage 553. Thereby, the radial dimension of the fluid control valve 5 that can achieve the object disclosed in the specification can be suppressed.

The fluid control valve 5 includes a communication passage 591 that communicates the first chamber section 59 and the second chamber section 60. The working fluid flowing out of the second chamber part 60 during the valve opening process flows into the first chamber part 59 through the communication passage 591 . The working fluid flowing out of the first chamber part 59 during the valve closing process flows into the second chamber part 60 through the communication passage 591.

According to this configuration, the working fluid in the second chamber section 60 can be moved to the first chamber section 59 through the communication passage 591 during the valve opening process. Further, during the valve closing process, the working fluid in the first chamber section 59 can be moved to the second chamber section 60 through the communication passage 591. Thereby, it is possible to provide the fluid control valve 5 in which fluid continuously flows back and forth between the first chamber section 59 and the second chamber section 60 using the same communication passage 591.

The fluid control valve 5 includes a valve support member 58 to which the valve part 57 is attached or a part thereof, and a plunger 55 that drives the valve support member 58 in the axial direction. The fluid control valve 5 includes a coil portion 540 that generates magnetic force, and a yoke 56 that is fixedly installed and forms a magnetic circuit with the plunger 55 when energized. The fluid control valve 5 includes parallel parts that are provided on the plunger 55 and the yoke 56 and have cross-sectional shapes along each other 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, one of the parallel parts, the plunger parallel part, comes into contact with the other parallel part, the yoke parallel part, or contacts the other parallel part, through an interposition, so as to form a magnetic path. In the valve closed state, the plunger 55 further supports the valve support member 58 in the axial direction.

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 attraction and holding force between the plunger 55 and the yoke 56 can be strengthened. In the valve closed state, the plunger 55 further supports the valve 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 parallel portion of the yoke. As described above, it is possible to provide a fluid control valve 5 that can achieve stable magnetic attraction force and valve closing force when the valve is closed.

In the closed state, the valve portion 57 and the valve seat 511 are in close contact. In the closed state, the plunger parallel portion contacts the yoke parallel portion or indirectly contacts the yoke parallel portion to form a magnetic path through an intervening material. In the valve closed state, the plunger 55 supports the valve support member 58 in the axial direction.

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

In the valve closed state, the valve support member 58 is supported in the axial direction by the plunger parallel portion. According to this configuration, the valve portion 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 part support member 58 can be strengthened, and the function of maintaining the axial position of the valve part 57 when the valve is closed can be enhanced.

The plunger parallel portion extends across the cylindrical portion 551 and includes a movable upstream annular portion on the upstream side of the working fluid than the cylindrical portion 551 . The yoke parallel portion includes a fixed upstream annular portion on the upstream side of the working fluid than the movable 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, the mechanism section that strengthens the attraction and holding force between the plunger 55 and the yoke 56 can be installed in a location close to the valve section 57, so that it is possible to provide a magnetic attraction force that easily influences the valve closing force.

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, since the magnetic attraction force can be applied in the perpendicular direction to the parallel portion, it is possible to provide the fluid control valve 5 that can strengthen the attraction force.

The fluid control valve 5 opens and closes the internal passage 512 so as to switch between an open state and a closed state, and includes a valve portion 57 on which the pressure of the working fluid acts in the direction of opening the valve. The fluid control valve 5 includes a first path that 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 that is a magnetic path through 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 larger in the first path than in the second path. In the valve closed state, a magnetic path is formed in which the magnetic flux is larger in the second path than in the first path.

According to the fluid control valve 5, at the time of starting energization in the valve open state, the plunger 55 can begin to be attracted against the fluid pressure using the driving force generated by the magnetic path passing through the first path. Further, in the process from the open state to the closed state of the valve portion 57, the plunger 55 can be attracted so as to maintain the valve closed state using the driving force generated by the magnetic path passing through the second path. At the start of energization with the valve open, the magnetic path passing through the first path becomes dominant. Thereby, it is possible to obtain a driving force that exerts a suction force that attracts the plunger 55 toward the valve seat 511 and moves the valve portion 57 in the valve closing direction against the pressure of the working fluid. Since the valve can be brought to the closed state while 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 valve closed state, the magnetic path passing through the second path becomes dominant. Thereby, the internal passage 512 can be closed off by exerting a suction force that maintains the valve portion 57 in contact with the valve seat 511. Due to this effect, the valve can be closed from the open state and maintained in the closed state without relying on a biasing force such as a spring. Therefore, it is possible to suppress the increase in size of the device due to the provision of a spring or the reinforcement of urging force. As described 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 closing against the pressure of the working fluid.

In the first path, the magnetic flux passes between an inclined part 561 which is a part of one of the plunger 55 and the yoke 56 and has a cross-sectional shape that is inclined with respect to the other part of the plunger 55 and the yoke 56, and the other part. It is a 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 that extend along each other. This parallel portion is composed of an upstream annular portion 550 of the plunger 55 and a 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 a first path having a larger magnetic flux than a second path passing through the parallel portion of the plunger 55 and the yoke 56 at the time of starting energization in the valve open state. In the process from the valve open state to the valve closed state, the parallel portion allows switching 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. In this way, the shapes of the plunger 55 and the yoke 56 are devised to construct a magnetic path. Thereby, it is possible to provide the fluid control valve 5 that can perform a valve closing operation from an open state and maintain a closed state without relying on a biasing force such as a spring.

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

The fluid control valve 5 includes a fluid passage 553 inside the plunger 55 through which a working fluid flows. 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 plunger 55 and yoke 56 come into contact in the valve closed state. According to this, the fluid control valve 5 can provide a suction force that closes the valve part 57 against the fluid pressure acting on the valve part 57, and can strengthen the suction 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 reducing the number of parts in the device, and furthermore, it is possible to reduce the air gap in the magnetic circuit.

The fluid control valve 5 may be controlled to a maximum voltage at the start of energization or suction in the valve open state, and may be controlled to a lower voltage than at the start of suction during adsorption and holding in the valve closed state. When this control is adopted, the first route and the second route described above are formed. Thereby, it is possible to provide a fluid control valve 5 that can satisfy the suction start and suction retention even if the energizing voltage is suppressed.

(Second embodiment)
A 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 plunger 155. The configuration, operation, and effects that are not particularly explained in the second embodiment are the same as those in the first embodiment, and the points that are different from the first embodiment will be explained below.

The plunger 155 includes a communication passage 552c that communicates the first chamber section 59 and the second chamber section 60. As shown in FIGS. 7 and 8, the communication passages 552c are passages extending in the axial direction, and a plurality of communication passages 552c are provided so as to be lined up in the circumferential direction in the downstream annular portion 552. The communication passage 552c is a passage that passes through the downstream annular portion 552 at a position close to the outer peripheral edge. The communication passage 552c communicates with the first chamber section 59 on the valve section 57 side, and communicates with the second chamber section 60 on the outflow port 530 side.

When the valve changes from the closed state to the open state, the fluid in the second chamber section 60 flows out to the first chamber section 59 through the communication passage 552c as the volume of the first chamber section 59 increases. When the valve is shifted from the open state to the closed state, the fluid in the first chamber section 59 flows out to the second chamber section 60 through the communication passage 552c as the volume of the first chamber section 59 decreases. Since the valve open state and the valve closed state are alternately repeated in this way, the fluid in the first chamber section 59 and the fluid in the second chamber section 60 damp the movement of the plunger 155. The fluid flows through the communication passage 552c repeatedly as the fluid control valve 5 opens and closes. According to the action of fluid flowing back and forth between the first chamber section 59 and the second chamber section 60 through the communication passage 552c, the same damper function as in the first embodiment can be continuously exhibited.

The plurality of communication passages 552c are arranged in an annular shape at intervals along the circumferential direction of the plunger 155. According to this configuration, the working fluid can be made to flow in and out of the plurality of communication passages 552c that are annularly provided in a well-balanced manner. The pressure of the fluid flowing through the plurality of communication passages 552c acts on the plunger 155 so as not to be biased, so that the plunger 155 can be moved in the axial direction without being eccentric.

(Third embodiment)
A 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 the shape of the plunger 255. The configuration, operation, and effects that are not particularly explained in the third embodiment are the same as those in the first embodiment, and the points that are different from the first embodiment will be explained below.

The communication passage 1552c is a passage formed between a partially recessed portion on the outer peripheral edge of the downstream annular portion 552 of the plunger 255 and the downstream cylindrical portion 563 or the housing. A plurality of communication passages 1552c are provided along the outer peripheral edge of the downstream annular portion 552 at intervals. The communication passage 1552c communicates with the first chamber section 59 on the valve section 57 side, and communicates with the second chamber section 60 on the outflow port 530 side.

When the valve is shifted from the closed state to the open state, the fluid in the second chamber section 60 flows out to the first chamber section 59 through the communication passage 1552c as the volume of the first chamber section 59 increases. When the valve is shifted from the open state to the closed state, the fluid in the first chamber section 59 flows out to the second chamber section 60 through the communication passage 1552c as the volume of the first chamber section 59 decreases. The fluid flows through the communication passage 1552c repeatedly as the fluid control valve 5 is opened and closed. According to the action in which the fluid moves back and forth between the first chamber part 59 and the second chamber part 60 through the communication passage 1552c, the same functions as in the first embodiment can be continuously exhibited.

According to the fluid control valve 5 of the third embodiment, the size, location, and number of communication passages 1552c can be set by forming the outer peripheral shape of the downstream annular portion 552. Therefore, it is possible to provide a fluid control valve 5 in which the performance exhibited by the orifice passage can be easily set.

The plurality of communication passages 1552c are arranged in an annular manner at intervals along the circumferential direction of the plunger 255. According to this configuration, the working fluid can be made to flow in and out of the plurality of communication passages 1552c that are annularly provided in a well-balanced manner. The pressure of the fluid flowing through the plurality of communication passages 1552c acts on the plunger 255 without being biased, and the plunger 255 can be moved in the axial direction without being eccentric.

(Fourth embodiment)
A 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 first embodiment in that it includes a plunger outer circumferential passage 521 and a communication passage 601. Configurations, operations, and effects that are not particularly explained in the fourth embodiment are the same as those in the above-described embodiments, and the points that are different from the first embodiment will be explained below.

The fluid control valve 5 of the fourth embodiment includes a plunger outer circumferential passage 521 extending in the axial direction outside the cylindrical portion 551 of the plunger 55. The plunger outer circumferential passage 521 is a cylindrical passage provided over the entire outer circumferential surface of the cylindrical portion 551. The plunger outer circumferential passage 521 is a cylindrical passage formed between a cylindrical portion 551 and a sliding support member 542 that are spaced apart in the radial direction. The plunger outer circumferential passage 521 forms a space outside the plunger 55 and inside the coil portion 540 in which the working fluid can flow in and out. The plunger outer peripheral passage 521 communicates with the fluid passage 581 or the upstream opening 550a on the valve portion 57 side or upstream side in the open state shown in FIG. 11. The plunger outer circumferential passage 521 communicates with the first chamber portion 59 on the outflow port 530 side or downstream side. With this configuration, the plunger outer circumferential passage 521 is filled with fluid in both the valve open state and the valve closed state.

This fluid control valve 5 is capable of accommodating foreign matter in the plunger outer circumferential passage 521 when foreign matter in the working fluid enters between the plunger 55 and the electromagnetic solenoid portion 54 . This configuration contributes to continuously performing the valve opening and closing operations of the plunger 55. According to this fluid control valve 5, locking of the plunger 55 due to foreign matter can be suppressed.

This fluid control valve 5 includes a communication passage 601. The first chamber section 59 and the second chamber section 60 communicate with each other through a communication passage 601 in the valve open state and the valve closed state. The communication passage 601 is a gap formed between the inner circumferential surface of the cylindrical portion 551 of the plunger 55 and the outer circumferential surface of the upstream cylindrical portion of the outflow port 530. The communication passage 601 is an annular gap provided along the entire outer circumference of the upstream cylindrical portion of the outflow port 530 . The communication passage 601 is a cylindrical passage extending in the axial direction. The communication passage 601 communicates with the fluid passage 553 on the valve portion 57 side or the upstream side, and communicates with the second chamber portion 60 on the downstream annular portion 552 side of the plunger 55.

The communication passage 601 has a small passage cross-sectional area with respect to the first chamber part 59 and the second chamber part 60, and has a fluid-dynamic orifice-like effect. Moreover, this fluid control valve 5 may be configured to include a communication passage 591 similar to that of the first embodiment. The fluid control valve 5 includes an orifice passage that communicates between the first chamber section 59 and the second chamber section 60 on the radially outer side, and communicates the fluid passage 553 and the second chamber section 60 on the radially inner side.

When the plunger 55 shifts from the closed state shown in FIG. 12 to the open state shown in FIG. 11, the fluid filling the second chamber section 60 exhibits the same damper function as in the first embodiment. When the valve is shifted from the closed state to the open state, the working fluid moves as shown by the broken arrow in FIG. 11 . At this time, the fluid filling the second chamber part 60 flows out to the fluid passage 553 through the communication passage 601 as the volume of the second chamber part 60 decreases and the pressure increases. At this time, fluid flows into the first chamber portion 59 from the plunger outer peripheral passage 521, or fluid from the second chamber portion 60 flows into the first chamber portion 59 via the communication passage 591.

When the plunger 55 shifts from the open state shown in FIG. 11 to the closed state shown in FIG. 12, the fluid filling the first chamber portion 59 exhibits the same damper function as in the first embodiment. When the valve is shifted from the open state to the closed state, the working fluid moves as shown by the broken arrow in FIG. 12 . As the volume of the second chamber section 60 increases, the fluid in the fluid passage 553 flows into the second chamber section 60 via the communication passage 601. Further, as the volume of the second chamber section 60 increases and the pressure decreases, the fluid from the first chamber section 59 flows into the second chamber section 60 through the communication passage 591.

By alternately repeating the valve open state and the valve closed state in this way, the fluid in the first chamber section 59 and the fluid in the second chamber section 60 damp the movement of the plunger 55. Furthermore, the action of the fluid flowing back and forth between the first chamber section 59 and the second chamber section 60 through the communication passage 601 contributes to the continuous implementation of the above damper function.

The fluid control valve 5 of the fourth embodiment includes a communication passage 601 that communicates a fluid passage 553 provided inside the plunger 55 with the second chamber part 60. The working fluid flowing out of the second chamber part 60 during the valve opening process flows into the fluid passage 553 through the communication passage 601. The working fluid flowing out of the fluid passage 553 during the valve closing process flows into the second chamber part 60 through the communication passage 601.

According to this configuration, the working fluid can be moved from the second chamber portion 60 to the fluid passage 553 through the communication passage 601 during the valve opening process. Further, during the valve closing process, the working fluid can be moved from the fluid passage 553 to the second chamber section 60 through the communication passage 601. Thereby, it is possible to provide the fluid control valve 5 in which fluid continuously flows back and forth between the fluid passage 553 through which the working fluid flows and the second chamber portion 60 using the same communication passage 601.

(Fifth embodiment)
The fifth embodiment will be described with reference to FIGS. 13 to 16. The fluid control valve 5 of the fifth embodiment differs from the first embodiment in that it includes a communication passage 611. Configurations, operations, and effects that are not particularly described in the fifth embodiment are the same as those in the above-described embodiments, and the points that are different from the first embodiment will be described below.

The fluid control valve 5 of the fifth embodiment includes a passage forming member 61 in which a communication passage 611 is formed. The passage forming member 61 is a cylindrical body with both axial ends open. The passage forming member 61 is a cylindrical body having an inner diameter that allows the downstream annular portion 552 of the plunger 55 to be inserted therethrough, and an outer diameter that fits into the inner wall surface of the intermediate housing 52 . The passage forming member 61 is installed such that one opening end is located closer to the outflow port 530 than the bobbin 541 in the axial direction, and the other opening end is in contact with the housing. The passage forming member 61 has an axial length that allows the inner peripheral surface to surround the outer periphery of the downstream annular portion 552 that moves between the valve open state and the valve closed state.

The passage forming member 61 is provided with a plurality of communication passages 611 arranged in the circumferential direction. The communication passage 611 is formed by a hole that partially penetrates the passage forming member 61 in the radial direction. As shown in FIG. 16, the communication passage 611 is formed by a hole portion whose circumferential length is larger in the middle portion than in one portion and the other portion in the axial direction. This hole is formed by connecting one and the other rectangular axial portions and a circular or elliptical intermediate portion as one opening. The communication passage 611 has a shape that changes from one end in the axial direction to the other end in the order of a narrow passage part with a narrow circumferential length, an enlarged passage part 611a with a wide width, and a narrow passage part again. In this way, the communication passage 611 is a passage whose passage width length in the direction perpendicular to the axial direction changes in the axial direction. Since the passage forming member 61 is configured to fit into the inner wall surface of the intermediate housing 52, the passage depth of the communication passage 611 is approximately the same as the thickness dimension of the passage forming member 61.

The first chamber section 59 and the second chamber section 60 communicate with each other through a communication passage 611 in the valve open state and the valve closed state. The communication passage 611 is a passage whose cross-sectional area is smaller than that of the first chamber part 59 and the second chamber part 60. The communication passage 611 is an axially extending passage formed between the inner wall surface of the intermediate housing 52 in which the passage forming member 61 is inscribed and the outer peripheral edge of the downstream annular portion 552. The communication passage 611 communicates with the first chamber portion 59 on the valve portion 57 side or on one axial side. The communication passage 611 communicates with the second chamber portion 60 on the outflow side housing 53 side or on the other axial side.

Like the communication passage 591 of the first embodiment, the communication passage 611 is a passage that acts like a fluid dynamic orifice. Therefore, when the passage forming member 61 is installed in the housing as described above, it functions like an orifice.

When the plunger 55 shifts from the closed state shown in FIGS. 15 and 16 to the opened state shown in FIGS. 13 and 14, the fluid filling the second chamber portion 60 exhibits the damper function described above. When the valve is shifted from the closed state to the open state, the working fluid moves as shown by the broken arrow in FIGS. 13 and 14. At this time, the fluid filling the second chamber section 60 flows out to the first chamber section 59 through the communication passage 611 as the volume of the first chamber section 59 increases and the pressure decreases.

More specifically, the fluid in the second chamber section 60 flows into the narrow passage section on the other side in the axial direction, flows down in the axial direction, passes through the enlarged passage section 611a, and passes through the narrow passage section on the one side in the axial direction. leading to. When the downstream annular portion 552 is at an axial position overlapping the enlarged passage portion 611a, the fluid flows down to the narrow passage portion on one axial side and then flows out into the first chamber portion 59. When the downstream annular portion 552 is at an axial position that does not overlap the enlarged passage portion 611a, the fluid flows down to the enlarged passage portion 611a and then flows out into the first chamber portion 59.

When the plunger 55 shifts from the open state to the closed state, the fluid filling the first chamber portion 59 exhibits the same damper function as in the first embodiment. When the valve is shifted from the open state to the closed state, the working fluid moves as shown by the broken arrow in FIGS. 15 and 16. At this time, the fluid filling the first chamber section 59 flows out to the second chamber section 60 through the communication passage 611 as the volume of the first chamber section 59 decreases and the pressure increases.

More specifically, the fluid in the first chamber section 59 flows into the narrow passage section on one axial side, flows down in the axial direction, passes through the enlarged passage section 611a, and passes through the narrow passage section on the other axial side. leading to. When the downstream annular portion 552 is at an axial position overlapping the enlarged passage portion 611a, the fluid flows down to the narrow passage portion on the other axial side and then flows out into the second chamber portion 60. When the downstream annular portion 552 is at an axial position that does not overlap the enlarged passage portion 611a, the fluid flows down to the enlarged passage portion 611a and then flows out into the second chamber portion 60.

When the valve open state and the valve closed state are alternately repeated, the fluid in the first chamber section 59 and the fluid in the second chamber section 60 each damp the movement of the plunger 55. Furthermore, the action of the fluid flowing back and forth between the first chamber part 59 and the second chamber part 60 through the communication passage 611 contributes to the continuous performance of the damper function.

The communication passage 611 is a passage formed such that the passage width increases or decreases depending on the axial position of the plunger 55 that axially divides the first chamber part 59 and the second chamber part 60. With this configuration, the amount of fluid that moves from one chamber section to the other chamber section can be adjusted depending on the axial position of the plunger 55. Thereby, it is possible to provide the fluid control valve 5 that can control the damping force by the chamber portion according to the axial position of the plunger 55.

The communication passage 611 is a passage having a predetermined length in the axial direction, and a passage width length in a direction perpendicular to the axial direction changes in the axial direction. According to this configuration, the width of the communication passage 611 leading to the first chamber part 59 and the width of the passage leading to the second chamber part 60 in the communication passage 611 change depending on the axial position of the plunger 55. . According to this action, the flow rate of fluid flowing in and out of the first chamber section 59 and the second chamber section 60 can be controlled according to the axial position of the plunger 55 during the valve opening process and the valve closing process. Therefore, it is possible to provide the fluid control valve 5 that has a technique that allows suitable control of the damping force caused by the fluid.

The plurality of communication passages 611 are arranged in a ring shape along the circumferential direction of the plunger 55 at intervals. According to this configuration, the working fluid can be made to flow in and out of the plurality of communication passages 611 provided in an annular manner with good balance. The pressure of the fluid flowing through the plurality of communication passages 611 acts on the plunger 55 so as not to be biased, so that the plunger 55 can be moved in the axial direction without being eccentric.

(Sixth embodiment)
A sixth embodiment will be described with reference to FIGS. 17 and 18. The fluid control valve 5 of the sixth embodiment is different from the first embodiment in that it includes a plunger outer circumferential passage 521 and a communication passage 531. Configurations, operations, and effects that are not particularly described in the sixth embodiment are the same as those in the above-described embodiments, and the points that are different from the first embodiment will be described below.

The fluid control valve 5 of the sixth embodiment includes a plunger outer circumferential passage 521 having the same configuration and effects as the fourth embodiment. This fluid control valve 5 includes a communication passage 531. The passage in the outflow port 530 and the second chamber section 60 communicate with each other through a communication passage 531 in the valve open state and the valve closed state. The communication passage 531 is a passage that penetrates the upstream cylindrical portion of the outflow port 530 in the radial direction. A plurality of communication passages 531 arranged in the circumferential direction are provided in the upstream cylindrical portion of the outflow port 530. The communication passage 531 communicates with a passage in the outflow port 530 on the radially inner side, and communicates with the second chamber section 60 on the radially outer side.

The communication passage 531 has a small passage cross-sectional area with respect to the passage in the outflow port 530 and the second chamber portion 60, and has a fluid-dynamic orifice-like effect. This fluid control valve 5 may be configured to include a communication passage 591 similar to the first embodiment. The fluid control valve 5 includes an orifice passageway that communicates the first chamber section 59 and the second chamber section 60 on the radially outer side and communicates the inside of the outflow port 530 and the second chamber section 60 on the radially inner side.

When the plunger 55 transitions from the closed state shown in FIG. 18 to the open state shown in FIG. 17, the fluid filling the second chamber section 60 exhibits the same damper function as in the first embodiment. When the valve is shifted from the closed state to the open state, the working fluid moves as shown by the broken line arrow in FIG. 17 . At this time, the fluid filling the second chamber section 60 flows out into the outflow port 530 through the communication passage 531 as the volume of the second chamber section 60 decreases and the pressure increases. Further, fluid flows into the first chamber portion 59 from the plunger outer peripheral passage 521, or fluid from the second chamber portion 60 flows into the first chamber portion 59 via the communication passage 591.

When the plunger 55 transitions from the open state shown in FIG. 17 to the closed state shown in FIG. 18, the fluid filling the first chamber portion 59 exhibits the same damper function as in the first embodiment. When the valve is shifted from the open state to the closed state, the working fluid moves as shown by the broken line arrow in FIG. 18 . As the volume of the second chamber section 60 increases, the fluid in the outflow port 530 flows into the second chamber section 60 via the communication passage 531. The fluid in the first chamber part 59 flows into the second chamber part 60 through the communication passage 591 as the volume of the second chamber part 60 increases and the pressure decreases.

When the valve open state and the valve closed state are alternately repeated in this way, the fluid in the first chamber section 59 and the fluid in the second chamber section 60 damp the movement of the plunger 55. Furthermore, the action of the fluid flowing back and forth between the first chamber part 59 and the second chamber part 60 through the communication passage 531 contributes to the continuous performance of the above damper function. The fluid control valve 5 can provide a configuration in which the communication passage 531 provides an orifice passage at a location where sliding parts such as the plunger 55 are not affected.

The fluid control valve 5 of the sixth embodiment includes a communication passage 531 that communicates the internal passage of the outflow port 530 and the second chamber part 60. The working fluid flowing out from the second chamber part 60 during the valve opening process flows into the internal passage of the outflow port 530 through the communication passage 531 . During the valve closing process, the working fluid flowing out from the internal passage of the outflow port 530 flows into the second chamber part 60 through the communication passage 531.

According to this configuration, the working fluid can be moved from the second chamber portion 60 to the internal passage of the outflow port 530 through the communication passage 531 during the valve opening process. Further, during the valve closing process, the working fluid can be moved from the internal passage of the outflow port 530 to the second chamber part 60 through the communication passage 531. Thereby, it is possible to provide the fluid control valve 5 in which fluid continuously flows back and forth between the internal passage of the outflow port 530 through which the working fluid flows and the second chamber section 60 using the same communication passage 531.

The plurality of communication passages 531 are arranged in a ring shape along the circumferential direction of the plunger 55 at intervals. According to this configuration, the working fluid can be made to flow in and out of the plurality of communication passages 531 that are annularly provided in a well-balanced manner. The pressure of the fluid flowing through the plurality of communication passages 531 acts on the plunger 55 so as not to be biased, and the plunger 55 can be moved in the axial direction without being eccentric.

(Other embodiments)
The disclosure in this specification is not limited to the illustrated embodiments. The disclosure includes the illustrated embodiments and variations thereon by those skilled in the art. For example, the disclosure is not limited to the combinations of parts and elements shown in the embodiments, and can be implemented with various modifications. The disclosure can be implemented in various combinations. The disclosure may have additional parts that can be added to the embodiments. The disclosure includes embodiments in which parts and elements of the embodiments are omitted. The disclosure encompasses any substitutions, 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 claims, and should be understood to include all changes within the meaning and scope equivalent to the claims.

The fluid control valve 5 that can achieve the object disclosed in the specification is not limited to the one that includes the first chamber section and the second chamber section described in the above embodiment. The first chamber part and the second chamber part are not limited to the configuration in which the fluid control valve 5 is provided on the outflow port side. The first chamber portion and the second chamber portion may be provided on the inflow port side, the upstream side, and the axial center portion of the fluid control valve 5.

In the fluid control valve 5 that can achieve the object disclosed in the specification, the member that divides the first chamber portion and the second chamber portion in the axial direction is not limited to the plunger. The member that axially divides the first chamber portion and the second chamber portion may be a member that is displaced in accordance with the axial displacement of the plunger and that is a separate component from the plunger. Further, the portion of the plunger that axially divides the first chamber portion and the second chamber portion is not limited to the downstream annular portion 552.

The fluid control valve 5 is not limited to a configuration including a yoke parallel portion and a plunger parallel portion, which are portions perpendicular to the axial direction. The fluid control valve 5 that can achieve this purpose includes, for example, a yoke parallel portion and a plunger parallel portion, which are portions that intersect at an angle with respect to the axial direction.

In the embodiment described above, the valve part 57 is a member attached to the valve part 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 part that forms a part of the plunger 55.

The fluid control valve 5 that can achieve the object disclosed in the specification is not limited to an electromagnetic valve that can control the flow rate of the cooling water, etc. in the cooling water circuit 1 through 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 working fluid used for cooling or heating, or as a solenoid valve that controls the flow of working oil such as automatic oil.

5...Fluid control valve, 51...Inflow side housing (housing)
55, 155, 255...Plunger, 56...Yoke, 57...Valve section 59...First chamber section, 60...Second chamber section 512...Internal passage, 530...Outflow port, 540...Coil section 531, 552c, 591, 601 , 611, 1552c...Communication passage 553...Fluid passage

Claims (7)

a housing (51) having an internal passageway (512) through which a working fluid flows;
a valve part (57) that opens and closes the internal passageway to switch between an open state that allows the flow of working fluid and a closed state that blocks the flow of working fluid;
a plunger (55; 155; 255) that drives the valve portion in the axial direction;
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) forming a magnetic circuit together with the plunger when energized;
A chamber section in which a working fluid is housed inside the housing, and when the volume of one chamber section increases in accordance with the axial displacement of the plunger, the volume of the other chamber section decreases, and the volume of the other chamber section decreases. a first chamber part (59) and a second chamber part (60) that are provided so that one volume decreases when the volume increases;
Equipped with
In a valve opening process in which the plunger is displaced from the valve closed state to the valve open state, working fluid flows out from the second chamber part and working fluid flows into the first chamber part,
In a valve closing process in which the plunger is displaced from the valve open state to the valve closed state, working fluid flows out from the first chamber part and working fluid flows into the second chamber part,
The second chamber portion is provided so as to communicate with the internal passage throughout the valve opening process and the valve closing process except for the valve closing state,
The first chamber portion and the second chamber portion are always in communication through a communication passage throughout the valve closing state, the valve opening process, and the valve closing process. The fluid control valve according to claim 1, wherein the first chamber section and the second chamber section are installed coaxially with respect to a fluid passageway (553) provided inside the plunger. The working fluid flowing out from the second chamber part during the valve opening process flows into the first chamber part through the communication passage,
3. The fluid control valve according to claim 1, wherein the working fluid flowing out from the first chamber part in the valve closing process flows into the second chamber part through the communication passage. a housing (51) having an internal passageway (512) through which a working fluid flows;
a valve part (57) that opens and closes the internal passageway to switch between an open state that allows the flow of working fluid and a closed state that blocks the flow of working fluid;
a plunger (55; 155; 255) that drives the valve portion in the axial direction;
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) forming a magnetic circuit together with the plunger when energized;
A chamber section in which a working fluid is housed inside the housing, and when the volume of one chamber section increases in accordance with the axial displacement of the plunger, the volume of the other chamber section decreases, and the volume of the other chamber section decreases. a first chamber part (59) and a second chamber part (60) that are provided so that one volume decreases when the volume increases;
Equipped with
In a valve opening process in which the plunger is displaced from the valve closed state to the valve open state, working fluid flows out from the second chamber part and working fluid flows into the first chamber part,
In a valve closing process in which the plunger is displaced from the valve open state to the valve closed state, working fluid flows out from the first chamber part and working fluid flows into the second chamber part,
a communication passageway ( 601 ) that communicates a fluid passageway (553) provided inside the plunger with the second chamber part;
The working fluid flowing out of the second chamber portion during the valve opening process flows into the fluid passage through the communication passage;
In the fluid control valve, the working fluid flowing out from the fluid passage during the valve closing process flows into the second chamber portion through the communication passage. a housing (51) having an internal passageway (512) through which a working fluid flows;
a valve part (57) that opens and closes the internal passageway to switch between an open state that allows the flow of working fluid and a closed state that blocks the flow of working fluid;
a plunger (55; 155; 255) that drives the valve portion in the axial direction;
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) forming a magnetic circuit together with the plunger when energized;
A chamber section in which a working fluid is housed inside the housing, and when the volume of one chamber section increases in accordance with the axial displacement of the plunger, the volume of the other chamber section decreases, and the volume of the other chamber section decreases. a first chamber part (59) and a second chamber part (60) that are provided so that one volume decreases when the volume increases;
Equipped with
In a valve opening process in which the plunger is displaced from the valve closed state to the valve open state, working fluid flows out from the second chamber part and working fluid flows into the first chamber part,
In a valve closing process in which the plunger is displaced from the valve open state to the valve closed state, working fluid flows out from the first chamber part and working fluid flows into the second chamber part,
a communication passageway ( 531 ) that communicates the internal passageway of the outflow port (530) with the second chamber portion;
The working fluid flowing out of the second chamber portion during the valve opening process flows into the internal passage of the outflow port through the communication passage;
In the fluid control valve, the working fluid flowing out from the internal passage of the outflow port in the valve closing process flows into the second chamber part through the communication passage. a housing (51) having an internal passageway (512) through which a working fluid flows;
a valve part (57) that opens and closes the internal passageway to switch between an open state that allows the flow of working fluid and a closed state that blocks the flow of working fluid;
a plunger (55; 155; 255) that drives the valve portion in the axial direction;
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) forming a magnetic circuit together with the plunger when energized;
A chamber section in which a working fluid is housed inside the housing, and when the volume of one chamber section increases in accordance with the axial displacement of the plunger, the volume of the other chamber section decreases, and the volume of the other chamber section decreases. a first chamber part (59) and a second chamber part (60) that are provided so that one volume decreases when the volume increases;
Equipped with
In a valve opening process in which the plunger is displaced from the valve closed state to the valve open state, working fluid flows out from the second chamber part and working fluid flows into the first chamber part,
In a valve closing process in which the plunger is displaced from the valve open state to the valve closed state, working fluid flows out from the first chamber part and working fluid flows into the second chamber part,
A communication passageway ( 591; 552c; 1552c; 611 ) communicating the first chamber part and the second chamber part,
The working fluid flowing out from the second chamber part during the valve opening process flows into the first chamber part through the communication passage,
The working fluid flowing out from the first chamber part in the valve closing process flows into the second chamber part through the communication passage,
The communication passage is a passage having a predetermined length in the axial direction, and a passage width in a direction perpendicular to the axial direction changes with respect to the axial direction. comprising a plurality of the communication passages,
The fluid control valve according to any one of claims 3 to 6, wherein the plurality of communication passages are arranged annularly at intervals along the circumferential direction of the plunger .

Images