JP2020085006A - Fluid control valve - Google Patents

Abstract

To provide a fluid control valve capable of preventing a plunger from being locked in a case where a foreign matter in working fluid is interposed between the plunger and a cylindrical member.SOLUTION: A fluid control valve 5 comprises a valve part 550b that opens and closes an internal passage 520 so as to switch between a valve opening state and a valve closing state, and a plunger 55 that is axially displaced over the valve opening state and the valve closing state. The fluid control valve 5 comprises a coil part 540 that generates magnetic force that drives the plunger 55 in an axial direction during energization, a yoke 56 that forms a magnetic circuit with the plunger 55 during energization, and a cylindrical member 57. The cylindrical member 57 has a separation part 572 that is separated so as to form a gap with respect to the outer peripheral surface of the plunger 55, and a support part 573 that is positioned closer to the central axis of the plunger 55 than the separation part 572 and supports the plunger 55 slidably in the axial direction.SELECTED DRAWING: Figure 2

Description

The disclosure herein relates to a fluid control valve.

Patent Document 1 discloses a fluid control valve that permits and blocks the flow of fluid flowing out of an engine in an engine cooling circuit. The valve body of the fluid control valve is movably supported by a cylindrical bearing portion formed on the cover between a position separated from the valve seat and a position abutted on the valve seat.

Japanese Patent No. 5811797

In the fluid control valve of Patent Document 1, the valve body slides in the axial direction with the shaft portion fitted inside the cylindrical bearing portion. When foreign matter in the working fluid enters between the shaft portion of the valve body and the cylindrical bearing portion, it is difficult to slide the shaft portion of the valve body with respect to the bearing portion and the valve body locks. There is.

An object of the present disclosure is to provide a fluid control valve that can prevent the plunger from locking when foreign matter in the working fluid is present between the plunger and the tubular member.

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

One of the disclosed fluid control valves is a housing (52) having an internal passage (520) through which a working fluid that is a liquid flows, and an opening that allows the working fluid to flow away from a valve seat (560b). A valve portion (550b; 58) that opens and closes the internal passage so as to switch between a valve state and a valve closed state, a plunger (55; 155) that is axially displaced between the valve opened state and the valve closed state, and a plunger when energized. The coil portion (540) that generates a magnetic force that drives the shaft in the axial direction, the yoke (56) that forms a magnetic circuit with the plunger when energized, and the plunger are provided so as to cover the outer peripheral surface of the plunger. A tubular member (57; 157; 257) slidably supported,
The tubular member and the plunger are separated from each other in the radial direction to form a gap (521) and a gap forming portion (551, 572; 2572) and a sliding portion (551, 573) that relatively slides in the axial direction. 1573; 2573).

According to this fluid control valve, when foreign matter in the working fluid enters between the plunger and the cylindrical member, the foreign matter can be accommodated in the gap in the gap forming portion, so that the plunger can be inserted into the cylindrical member. Can be slid. As described above, according to this fluid control valve, it is possible to prevent the plunger from locking when foreign matter in the working fluid is present between the plunger and the tubular member.

It is a block diagram which shows the cooling water circuit which concerns on 1st Embodiment. FIG. 7 is a vertical cross-sectional view showing a vertical cross section of a portion other than the tubular member of the fluid control valve in the open state. FIG. 6 is a vertical cross-sectional view showing a vertical cross section of a portion other than the tubular member of the fluid control valve in the valve closed state. FIG. 3 is a vertical cross-sectional view showing a relationship between a tubular member and a plunger of the fluid control valve shown in FIG. 2. FIG. 4 is a vertical cross-sectional view showing a relationship between a tubular member and a plunger of the fluid control valve shown in FIG. 3. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. It is the longitudinal cross-sectional view which showed the vertical cross section of the fluid control valve of 2nd Embodiment other than a cylindrical member. It is the longitudinal cross-sectional view which showed the vertical cross section of the fluid control valve of 3rd Embodiment except a cylindrical member.

Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. In each mode, parts corresponding to the matters described in the preceding mode may be denoted by the same reference numerals, and redundant description may be omitted. In the case where only a part of the configuration is described in each mode, the other mode described above can be applied to the other part of the configuration. Not only the combination of the parts clearly showing that the respective embodiments can be specifically combined, but also the combination of the embodiments is partially combined even if the combination is not particularly specified unless there is a problem in the combination. It is also possible.

(First embodiment)
A fluid control valve that achieves the object of the disclosure has a valve closing direction in a direction opposite to the direction in which the pressure of a working fluid flowing through the valve acts, and has a valve opening state in which a fluid passage is opened and a valve closing state in which a fluid passage is closed. It is a switching device. The working fluid controlled by the fluid control valve is a liquid such as water or oil.

A first embodiment disclosing an example of the fluid control valve will be described with reference to FIGS. 1 to 6. The fluid control valve 5 of the first embodiment is used in the cooling water circuit 1 that uses a liquid as a working fluid. The cooling water circuit 1 is a circuit in which engine cooling water circulates, and has a function of efficiently warming up and cooling the engine 2 provided in the vehicle. As shown in FIG. 1, the cooling water circuit 1 includes an engine 2, a pump 3, a first flow passage 10, a second flow passage 11, a third flow passage 12, a switching valve 4, a heater core 6, a fluid control valve 5, and a radiator. 7, a control device 8 and the like.

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

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

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

The radiator 7 is provided in the third flow path 12. A switching valve 4 is provided at a merging portion where the third flow passage 12 is connected to the first flow passage 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 the first state, the second state and the third state. The first state is a state in which the first flow passage 10 and the third flow passage 12 are not communicated so that the cooling water circulates in the first flow passage 10. In the second state, the switching valve 4 connects the third flow passage 12 and the passage on the engine side so that the cooling water returns to the engine 2 via the third flow passage 12. The third state is a state in which all the 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 third state when the cooling water satisfies a predetermined temperature condition, and switches the flow path to the first state when the cooling water does not satisfy the predetermined temperature condition. For example, a thermostat valve Can be configured by. That is, the opening degree of the switching valve 4 changes according to the amount of heat applied to the temperature-sensitive wax (cooling water temperature).

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

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

When the cooling water temperature becomes equal to or higher than the first temperature, the warm-up control of the engine 2 ends. When the cooling water temperature becomes equal to or higher than the second temperature which is set higher than the first temperature, the switching valve 4 switches to the second state or the third state, and the cooling water circulates through the third flow path 12 and the radiator 7 At, the cooling water is radiated. When the control device 8 cuts off the energization and controls the fluid control valve 5 in the open state, the cooling water circulates in the second flow path 11, and the heater core 6 also radiates the cooling water. Further, when the heater core 6 needs to radiate heat from the cooling water in the first state, the control device 8 may cut off the energization to control the fluid control valve 5 in the open state.

As another mode, the cooling water circuit 1 described above may not have the first flow path 10 that serves as a path through which the fluid flowing out from the engine 2 returns to the engine without passing through the heater core 6 and the radiator 7. Good. The switching valve 4 may be configured to switch the flow path of the cooling water circuit 1 so as not to implement the second state. The control device 8 may be configured to control the fluid control valve 5 based on a detection value of a sensor that detects an engine oil temperature or an oil temperature of a transmission or the like.

Next, the fluid control valve 5 will be described with reference to FIGS. 2 and 4 show the valve open state, and FIGS. 3 and 5 show the valve closed state. FIG. 6 shows a cross section showing the inside of the intermediate housing 52 in the fluid control valve 5.

The fluid control valve 5 includes a plunger 55 that is a movable core having a valve portion 550b, a yoke 56 that has a valve seat portion 560b that is a seat valve, a tubular member 57, 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 a valve opening direction, which is a direction in which the valve portion 550b moves away from the valve seat portion 560b. That is, the fluid control valve 5 is an electromagnetic valve device in which the valve closing direction of the valve portion 550b is set in the direction against the fluid pressure. The fluid control valve 5 opens and closes the internal passage 520 provided in the housing according to the balance state between the fluid pressure received from the working fluid and the magnetic force generated by energization. The internal passage 520 constitutes a passage having the upstream opening 560a of the yoke 56 as an inlet inside the intermediate housing 52.

The plunger 55 is a cup-shaped body in which one end side in the axial direction is closed and the other end side is opened. The plunger 55 includes an upstream side board portion 550 provided on the inflow port 510 side, a downstream side annular portion 552 provided on the outflow port 530 side, and a tube connecting the upstream side board portion 550 and the downstream side annular portion 552. And a shape portion 551. The upstream side board portion 550 has an outer diameter dimension similar to that of the tubular portion 551, and includes a valve portion 550b that is seated on the valve seat portion 560b on the surface located on the inflow port 510 side. The upstream side plate portion 550 is provided on the upstream side of the cylindrical portion 551 in the plunger 55, and corresponds to the plunger side plate portion having a flat surface. The valve portion 550b is provided at a position facing the valve seat portion 560b provided as a part of the yoke 56 in the plunger 55.

The tubular member 57 is provided coaxially with the plunger 55 so as to cover the outer peripheral surface of the plunger 55. The tubular member 57 is a member that is fixed inside the intermediate housing 52 and supports the plunger 55 slidably in the axial direction. The tubular member 57 is supported so as not to move by, for example, the yoke 56 and the bobbin 541. The portion forming the outer peripheral surface of the tubular member 57 is in contact with and supported by the bobbin 541. The axial direction is a direction along the central axis of the plunger 55 or a direction along the central axis of the tubular member 57, and is also the moving direction of the plunger 55. The upstream side board part 550 is provided so that at least the valve part 550b forms a surface orthogonal to the axial direction. Further, the upstream side board portion 550 is provided so that at least the valve portion 550b forms a plane parallel to the valve seat portion 560b.

The plunger 55 is made of, for example, a magnetic material. The valve portion 550b may be made of a magnetic material. The plunger 55 is a member in which the surface of the valve portion 550b has not been polished or cut. In the pressing process for manufacturing the plunger 55, the plate material is formed by drawing and bending. The plunger 55 is a member formed by either forging or rolling. Since forging and rolling are processing techniques for forming a predetermined shape by a compressive force without cutting the material, it is possible to form the plunger 55 on the surface of the valve portion 550b which is not subjected to polishing treatment or cutting treatment. .. The plunger 55 is formed by press working, forging, forging, face pressing, rolling, casting, or a combination of a plurality thereof, in which the surface of the valve portion 550b is not subjected to polishing treatment or cutting treatment. It is a member. The surface of the valve portion 550b is constituted by the surface of a plate material formed in parallel with the valve seat portion 560b. By such molding, it is possible to form the surface of the valve portion 550b capable of ensuring the valve closing performance with the valve seat portion 560b without finishing the surface of the valve portion 550b after the molding, such as polishing or cutting. You can

The downstream annular portion 552 is a flange-shaped portion having an outer diameter dimension larger than that of the tubular portion 551 and having a shape that radially expands so as to be orthogonal to the tubular portion 551. A downstream passage 552a located radially outward of the tubular portion 551 penetrates through the downstream annular portion 552 in the axial direction. A plurality of downstream passages 552a are provided in the downstream annular portion 552 so as to be lined up in the circumferential direction. The downstream passage 552a communicates with the communication passage 521 provided between the tubular portion 551 and the tubular member 57 on the upstream side, and communicates with the outflow port 530 on the downstream side.

The communication passage 521 is a fluid passage corresponding to a gap formed by the tubular member 57 and the plunger 55 separated from each other in the radial direction, and communicates with the internal passage 520 on the upstream side. The communication passage 521 is a fluid passage through which the working fluid flows outside the plunger 55 and inside the coil portion 540. As described above, the internal passage 520, the communication passage 521, and the downstream passage 552a form a passage that connects the inflow port 510 and the outflow port 530.

At least the downstream annular portion 552 of the plunger 55 is slidably supported in the axial direction while being inserted in the second tubular portion 565 located at the downstream end of the yoke 56. Further, the plunger 55 is slidable in the axial direction because at least the tubular portion 551 is partially supported by the tubular member 57 provided inside the bobbin 541. Like the bobbin 541, the tubular member 57 is made of a non-magnetic material.

As shown in FIGS. 2 to 6, the tubular member 57 is provided with a plurality of recesses arranged in the circumferential direction at intervals. This recess is a portion recessed closer to the central axis of the plunger 55 than the spacer 572. This concave portion is a support portion 573 that supports the plunger 55 so as to be axially slidable on the inner peripheral side surface of the concave portion. The support portion 573 is the bottom of the recess, and is located closer to the center axis of the plunger 55 than the spacing portion 572. The support portion 573 supports the plunger 55 so that the outer peripheral surface of the plunger 55 slides in the axial direction at the bottom of the recess.

A separation portion 572 is provided between the support portions 573 adjacent to each other. Thus, the outer peripheral surface of the tubular member 57 has a shape in which concave surfaces and convex surfaces are alternately arranged in the circumferential direction. This recess is also a groove that is adjacent to the separating portion 572 in the circumferential direction and is elongated in the axial direction. The support portion 573 is provided so as to extend from the position downstream of the upstream end portion of the separating portion 572 in the tubular member 57 to the downstream end portion 571.

The tubular member 57 is provided with a separating portion 572 that is separated from the outer peripheral surface of the plunger 55 so as to form a gap. This gap constitutes a communication passage 521 which is a fluid passage communicating with the internal passage 520. The spacing portion 572 is provided in the entire axial direction so as to extend from the upstream end portion 570 to the downstream end portion 571 on the outer peripheral surface of the tubular member 57. This gap constitutes a fluid passage that extends in an elongated direction in the axial direction. Since the support portions 573 and the spacing portions 572 are alternately provided over the entire circumference of the tubular member 57, the tubular member 57 and the plunger 55 form a plurality of gaps.

The separating portion 572 is provided at the upstream end 570 over the entire circumference of the tubular member 57. The spacing portion 572 is provided so as to branch to both sides of the support portion 573 from the upstream end portion to the downstream end portion 571 of the support portion 573. According to this configuration, the working fluid that has flowed down the internal passage 520 in the valve open state flows inside the tubular member 57 while forming an annular flow over the entire outer peripheral surface of the plunger 55. Further, the working fluid is branched into the gaps provided on both sides of the support portion 573 at the upstream end portion of the support portion 573, flows down through the plurality of gaps arranged along the entire circumference, and flows out to the outflow port 530 through the downstream side passage 552a. To do. The working fluid flows down inside the tubular member 57 while forming an annular shape on the upstream end 570 side, and while forming a plurality of streaks lined up at intervals in the circumferential direction on the downstream side. Then, it will flow out from the tubular member 57.

The housing body forming a fluid passage in the fluid control valve 5 includes an inflow side housing 51 provided with an inflow port 510 which is an inflow passage into which a working fluid flows, and an outflow side housing provided with an outflow port 530 which is an outflow passage. 53 and an intermediate housing 52. The intermediate housing 52 connects the inflow side housing 51 and the outflow side housing 53. A flange portion provided at a downstream end portion of the inflow housing 51 is integrally coupled to the intermediate housing 52.

A flange portion provided at an upstream end of the outflow side housing 53 is integrally connected to the intermediate housing 52. The inflow-side housing 51, the intermediate housing 52, and the outflow-side housing 53 are made of a resin material, and are welded and joined to each other at the joint portion.

The intermediate housing 52 incorporates a yoke 56, a plunger 55, a tubular member 57, a coil portion 540, a bobbin 541 and the like. Like the plunger 55, the yoke 56 is made of, for example, a magnetic material. The valve seat portion 560b may be made of a magnetic material. The yoke 56 constitutes a part of the magnetic circuit, and supports the bobbin 541 and the tubular member 57 inside the intermediate housing 52. The yoke 56 is provided so as to cover the outer peripheral sides of the bobbin 541 and the coil portion 540. The yoke 56, the plunger 55, the coil portion 540, the bobbin 541 and the tubular member 57 are installed so that their central axes are coaxial.

The electromagnetic solenoid portion 54 includes a yoke 56, a coil portion 540, a bobbin 541, a connector and the like. The connector is provided so as to be located laterally or outside the yoke 56. The connector is provided to energize the coil portion 540, and the internal terminal terminal is electrically connected to the coil portion 540. The electromagnetic solenoid unit 54 can control the current supplied to the coil unit 540 by electrically connecting the terminal terminal to a current control device or the like with a connector. The bobbin 541 is formed of a resin material in a cylindrical shape, and the coil portion 540 is wound around the outer peripheral surface. When the coil portion 540 is energized, the generated magnetic flux forms a magnetic circuit that circulates in the yoke 56 and the plunger 55.

The yoke 56 is a tubular body whose both ends in the axial direction are open. The yoke 56 includes an upstream first annular portion 560 provided on the inflow port 510 side, an inclined portion 561 inclined with respect to the central axis of the plunger 55, and a first annular portion extending radially outward from a downstream end portion of the inclined portion 561. And two annular portions 562. The yoke 56 further includes a first tubular portion 563 extending axially from the outer peripheral edge of the second annular portion 562, a second tubular portion 565 having a cross-sectional shape extending axially at the downstream end, and a first tubular portion 565. A downstream side annular portion 564 that connects the tubular portion 563 and the second tubular portion 565 is provided. The downstream annular portion 564 radially extends radially outward from the downstream end portion of the first tubular portion 563 and is integrated with the second tubular portion 565 on the outer peripheral side.

The first annular portion 560 is provided on the upstream side of the inclined portion 561 in the yoke 56 and corresponds to a yoke side plate portion having a flat surface. The inclined portion 561 is a tubular portion having a shape in which the upstream end is connected to the first annular portion 560 and the downstream end is connected to the second annular portion 562. 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. Hereinafter, the cross-sectional shape related to the inclined portion and the parallel portion is a vertical cross-sectional shape along the axial direction of the plunger 55 and the like. The inclined portion 561 is formed such that the upstream end has a smaller outer diameter dimension than the downstream end. Therefore, the inclined portion 561 is inclined with respect to the tubular portion 551 such that the diameter increases toward the downstream side. An upstream end portion of the inclined portion 561 has a diameter dimension larger than that of the tubular portion 551.

The first annular portion 560 is capable of contacting the upstream side disc portion 550 of the plunger 55, has a diameter dimension larger than that of the upstream side disc portion 550, and has a through hole through the upstream side opening portion 560 a formed coaxially with the plunger 55. Have as. The first annular portion 560 and the upstream side board portion 550 are portions that face each other in the axial direction and are parallel portions having a cross-sectional shape that extends along each other.

The first annular portion 560 includes a valve seat portion 560b that contacts the valve portion 550b on the surface located on the downstream side. The first annular portion 560 is provided so that at least the valve seat portion 560b forms a surface orthogonal to the axial direction. Further, the upstream side board portion 550 is provided so that at least the valve portion 550b forms a plane parallel to the valve seat portion 560b. The valve seat portion 560b is provided at a position facing the valve portion 550b provided as a part of the plunger 55 in the yoke 56. In the valve closed state, the valve seat portion 560b is a portion that contacts the valve portion 550b so as to form an annular surface or an annular line radially outward of the upstream opening 560a in the first annular portion 560.

The fluid control valve 5 forms a first path that is a magnetic path through which magnetic flux passes between the plunger 55 and the yoke 56 on the downstream side when energized in the valve open state shown in FIGS. 2 and 4. The fluid control valve 5 forms a second path that is a magnetic path through which magnetic flux passes between the plunger 55 and the yoke 56 on the upstream side and the downstream side when energized in the valve closed state shown in FIGS. 3 and 5. The second path is a magnetic path through which magnetic flux passes between the plunger 55 and the yoke 56 at a portion different from the first path. The second path formed on the upstream side is a magnetic path through which magnetic flux passes between the upstream side board portion 550 and the first annular portion 560, and passes through the valve portion 550b and the valve seat portion 560b. The second path formed on the downstream side is a magnetic path through which magnetic flux passes between the second tubular portion 565 and the downstream annular portion 552.

As shown in FIG. 2 and FIG. 4, when the valve 55 is open and energized, at the downstream end of the plunger 55 and the yoke 56, the first path between the downstream annular portion 552 and the second tubular portion 565 is obtained. The magnetic flux passes through. The distance between the plunger 55 and the yoke 56 on the downstream side in the valve open state is the shortest between the downstream annular portion 552 and the second tubular portion 565.

When the valve opening state shown in FIGS. 2 and 4 is approached to the valve closing state and the valve closing state shown in FIGS. 3 and 5 is reached, a reversal phenomenon occurs in which the second path is more dominant than the first path. This is because the downstream annular portion 552 and the downstream annular portion 564 forming the parallel portions are in contact with each other, or the downstream side is closest to the plunger 55 and the yoke 56. On the downstream side, the area between the downstream annular portion 552 and the downstream annular portion 564 is the portion having the smallest magnetic resistance and the largest magnetic flux. In the valve closed state, the second path through which the magnetic flux passes between the upstream side board portion 550 and the first annular portion 560 is dominant at the upstream end portions of the plunger 55 and the yoke 56. In this way, the second path is dominant because the upstream side board portion 550 and the first annular portion 560 forming the parallel portions are in contact with each other, or between the plunger 55 and the yoke 56 on the upstream side. Because it is close.

As described above, in the fluid control valve 5, on the downstream side, immediately before the valve closed state, the suction force of the plunger 55 changes so that the second path becomes larger than the first path. The fluid control valve 5 is provided with a configuration in which the valve portion 550b is adsorbed to the valve seat portion 560b by the second path on both the upstream side and the downstream side, so that the valve portion 550b acts on the fluid pressure acting on the valve portion 550b. It can be seated on the valve seat portion 560b, and the suction holding force when the valve is closed can be strengthened.

The suction force for sucking the plunger 55 is larger in the first path than in the second path while the valve opening state is approaching the valve closing state, and the reversal phenomenon occurs immediately before the valve closing state to cause the second path in the valve closing state. There is a characteristic that the route is larger than the first route. As shown in FIG. 2 and FIG. 4, in the valve open state when energized, the first path is the dominant magnetic path over the second path. This is because between the plunger 55 and the yoke 56, the distance between the downstream annular portion 552 and the second tubular portion 565 is the shortest and the magnetic resistance is the smallest, and the magnetic flux is the largest. is there. Therefore, in the fluid control valve 5, in the valve open state, the suction force for sucking the plunger 55 is larger in the first path than in the second path. Therefore, the fluid control valve 5 can suck the plunger 55 against the fluid pressure acting on the valve portion 550b by adopting the structure in which suction is started in the first path, and the suction performance at the start of energization is enhanced. it can.

When approaching the valve closed state from the valve opened state, the fluid control valve 5 changes so that the suction force of the plunger 55 becomes larger in the second path immediately before the valve closed state. Therefore, the fluid control valve 5 adopts a configuration in which the valve portion 550b is adsorbed to the valve seat portion 560b by the second path, thereby enhancing the adsorption retention force when the valve is closed against the fluid pressure acting on the valve portion 550b. can do. As described above, the fluid control valve 5 provides an electromagnetic valve having advantageous characteristics related to the suction force of both the first path and the second path.

Next, the function and effect of the fluid control valve 5 of the first embodiment will be described. The fluid control valve 5 includes a housing having an internal passage 520 through which the working fluid flows, and an internal passage 520 separated from the valve seat portion 560b to switch between an open state and a closed state in which the working fluid is allowed to flow. And a valve unit 550b that opens and closes. The fluid control valve 5 includes a plunger 55 that is axially displaced between an opened state and a closed state, a coil portion 540 that generates a magnetic force that drives the plunger 55 in the axial direction when energized, and a magnetic field together with the plunger 55 when energized. A yoke 56 forming a circuit and a tubular member 57 are provided. The tubular member 57 is provided so as to cover the outer peripheral surface of the plunger 55, and supports the plunger 55 slidably in the axial direction. The tubular member 57 and the plunger 55 form a gap forming portion that is radially separated from each other to form a gap, and a sliding portion that relatively slides in the axial direction.

According to the fluid control valve 5, when foreign matter in the working fluid enters between the plunger 55 and the tubular member 57, the foreign matter can be contained in the gap formed by the gap forming portion. The foreign matter is a solid matter whose shape does not change easily, or a fluid matter which is deformed in a flowing process. The fluid material contains a slurry in the form of mud. The gap is set to have a radial dimension that prevents foreign matter from contacting both the plunger 55 and the tubular member 57 at the same time, and therefore the foreign matter does not hinder the axial displacement of the plunger 55. Accordingly, even if foreign matter in the working fluid enters between the plunger 55 and the tubular member 57, the plunger 55 is slid relative to the tubular member 57 so that the operation of the plunger 55 does not immediately stop. You can As described above, according to the fluid control valve 5, it is possible to prevent the plunger 55 from locking when foreign matter in the working fluid is present between the plunger 55 and the tubular member 57.

The tubular member 57 is located closer to the central axis of the plunger 55 than the spacing portion 572 and the spacing portion 572 that is spaced apart from the outer peripheral surface of the plunger 55 so as to slide the plunger 55 in the axial direction. And a supporting portion 573 that supports it as much as possible. According to this configuration, the tubular member 57, which is thinner than the plunger 55, is manufactured so as to have the spacing portion 572 and the support portion 573, so that the fluid having both the axial displacement of the plunger 55 and the foreign matter accommodating function. A control valve 5 can be provided.

The support portion 573 is a recessed portion that is recessed closer to the central axis of the plunger 55 than the spacing portion 572. According to this configuration, the fluid control valve 5 having both the stable axial displacement of the plunger 55 and the foreign matter accommodating function can be provided by forming the recessed portion that is recessed radially inward of the spacing portion 572 in the tubular member 57. ..

The supporting portions 573 and the separating portions 572 are alternately provided over the entire circumference of the tubular member 57. With this configuration, the plunger 55, the sliding portion of the tubular member 57, and the gap can be evenly arranged on the entire circumference of the plunger 55. Accordingly, it is possible to provide the fluid control valve 5 that achieves both stability of the axial displacement of the plunger 55 and foreign matter accommodating performance over a wide range.

The communication passage 521 is a gap between the tubular member 57 and the plunger 55. This gap is a fluid passage communicating with the internal passage 520. This gap is a fluid passage through which the working fluid flows outside the plunger 55 and inside the coil portion 540. According to this configuration, the working fluid flows in this gap in the valve open state, so that heat generation from the coil portion 540 due to energization can be suppressed by the working fluid. Furthermore, since the working fluid flows between the tubular member 57 and the plunger 55, the sliding resistance between the tubular member 57 and the plunger 55 can be reduced.

A plurality of gaps are formed between the tubular member 57 and the plunger 55. Each of the gaps is a fluid passage elongated in the axial direction. With this configuration, the working fluid flowing down the internal passage 520 in the valve open state flows into this gap, flows in the axial direction, and flows out to the outflow port 530 via the downstream passage 552a. As a result, the working fluid is divided into a plurality of layers outside the plunger 55 in the axial direction and flows in layers. Therefore, the fluid control valve 5 has an effect of suppressing heat generation from the coil portion 540 due to energization over the entire circumference of the plunger 55.

The fluid control valve 5 has a first path which is a magnetic path through which magnetic flux passes between the plunger 55 and the yoke 56, and a magnetic path through which magnetic flux passes between the plunger 55 and the yoke 56 at a portion different from the first path. And a certain second path. At the start of energization in the valve open state, the first path forms a magnetic path in which the magnetic flux is larger than the second path, and in the valve closed state, the magnetic flux is larger in the second path than in the first path. Form a magnetic path.

According to the fluid control valve 5, when the energization is started, the driving force generated by the magnetic path passing through the first path having a larger magnetic flux than the second path is used to start sucking the plunger 55 against the fluid pressure. You can Further, in the process from the valve opening state to the valve closing state, the valve portion 550b is attracted to the valve seat portion 560b by using the driving force generated by the magnetic path passing through the second path having a larger magnetic flux than the first path. The valve closed state can be maintained. In this way, the magnetic path passing through the first path is predominant at the start of energization in the valve-opened state, so that a suction force that sucks the plunger 55 toward the valve seat portion 560b is exerted to resist the pressure of the working fluid. A driving force for moving the valve portion 550b in the direction can be obtained. In the valve closed state, the magnetic path passing through the second path becomes dominant, so that the internal passage 520 can be kept closed by exerting an adsorbing force for maintaining the valve portion 550b in contact with the valve seat portion 560b. it can. From the above, the fluid control valve 5 can improve the valve closing performance of closing the valve against the pressure of the working fluid.

Furthermore, since the valve closing operation from the valve opening state and the valve closing state can be maintained at the same time without depending on the biasing force of the spring or the like, it is possible to suppress the increase in size of the device due to the provision of the spring and the strengthening of the biasing force. .. In the fluid control valve 5, since the plunger 55 and the yoke 56 further have the functions of the valve portion 550b and the valve seat portion 560b, it is not necessary to provide separate valve bodies, and the number of parts and the number of parts management steps can be suppressed.

By providing the fluid control valve 5 with the configuration in which the plunger 55 and the yoke 56 form a magnetic circuit, the fluid control valve 5 contributes to the suppression of the number of parts of the device and further suppresses the air gap in the magnetic circuit.

The fluid control valve 5 may be controlled to a maximum voltage at the start of energization in the valve open state (at the start of suction) and at a voltage lower than that at the start of suction at the time of suction holding in the valve closed state. When this control is adopted, the fluid control valve 5 that can satisfy the suction start and the suction hold even if the energization voltage is suppressed can be provided by the configuration including the first path and the second path described above.

The valve portion 550b and the valve seat portion 560b are provided in the parallel portion that forms the second path in the valve closed state. According to this configuration, the valve portion 550b and the valve seat portion 560b are provided in the parallel portion where the second path where the overlapping area or the contact area of the plunger 55 and the yoke 56 is large and the magnetic flux is large is formed. Therefore, it is possible to provide the fluid control valve 5 having a valve function at the portion where the attraction force by the electromagnetic force acts, and it is possible to enhance the shutoff performance of the valve.

In the fluid control valve 5, the second path is set to a plurality of parts. At least one of the second paths set in the plurality of portions is preferably formed in a portion where the plunger 55 and the yoke 56 contact each other in the valve closed state. According to this configuration, since at least one of the plurality of second paths is provided at the portion where the plunger 55 and the yoke 56 are in contact with each other, the valve portion 550b is closed against the fluid pressure acting on the valve portion 550b. It is possible to provide a suction force that can maintain the valve state, and to strengthen the suction holding force when the valve is closed.

The second path is preferably formed at a portion where the plunger 55 and the yoke 56 are in contact with each other in the valve closed state. According to this configuration, the fluid control valve 5 is provided with the second path at the portion where the plunger 55 and the yoke 56 are in contact with each other, so that the valve portion 550b is closed in response to the fluid pressure acting on the valve portion 550b. It is possible to provide a continuous suction force and enhance the suction holding force when the valve is closed.

(Second embodiment)
The second embodiment will be described with reference to FIG. The fluid control valve 105 of the second embodiment is different from the first embodiment in the support portion 1573 of the tubular member 157. The configurations, operations, and effects that are not particularly described in the second embodiment are similar to those in the first embodiment, and only differences from the first embodiment will be described below.

The cylindrical member 157 is provided with a through hole 1573a penetrating the outer peripheral wall in the radial direction. The cylindrical member 157 is provided with a plurality of through holes 1573a that are arranged in the circumferential direction at intervals. The through hole 1573a is an opening elongated in the axial direction and is also called a slit. The through hole 1573a is provided in the tubular member 157 in the entire axial direction from the upstream end 570 to the downstream end 571. A space 572 is provided between the through holes 1573a and 1573a adjacent to each other. The through holes 1573a and the separating portions 572 are alternately provided over the entire circumference of the tubular member 157.

The peripheral portion of the through hole 1573a is a portion surrounding the periphery of the through hole 1573a, and the tip of the peripheral portion is located closer to the central axis of the plunger 55 than the separating portion 572. The peripheral portion of the through hole 1573a has a shape protruding toward the center axis of the plunger 55 or the tubular member 157, and supports the plunger 55 slidably in the axial direction closer to the center axis of the plunger 55 than the separating portion 572. It is the supporting portion 1573 that performs. That is, the peripheral edge of the through hole 1573a supports the plunger 55 so that the outer peripheral surface of the plunger 55 slides in the axial direction at the tip. The peripheral portion of the through hole 1573a slidably supports the outer peripheral surface of the plunger 55 by the shape along the contour of the through hole 1573a. The peripheral portion of the through hole 1573a and the separating portion 572 are alternately provided over the entire circumference of the tubular member 157. The through hole 1573a forms a space between the outer peripheral surface of the plunger 55 and the inner peripheral portion of the bobbin 541. This space has a function of letting out foreign matter, like the gap formed between the separating portion 572 and the outer peripheral surface of the plunger 55.

According to the second embodiment, the tubular member 157 is formed with the through hole 1573a and the peripheral portion of the through hole 1573a. A peripheral portion of the through hole 1573a is a support portion 1573 projecting closer to the central axis of the plunger 55 than the separating portion 572. According to this configuration, it is possible to provide the fluid control valve 105 that has the stable axial displacement of the plunger 55 and the foreign substance accommodating function as well as the area of the sliding portion is suppressed by the peripheral portion of the through hole 1573a. The fluid control valve 105 has an effect of suppressing the resistance of the sliding portion between the tubular member 157 and the plunger 55.

(Third Embodiment)
The third embodiment will be described with reference to FIG. The fluid control valve 205 of the third embodiment is different from the first embodiment in the tubular member 257. Further, in the fluid control valve 205, the magnetic path passing between the plunger 155 and the yoke 156 is the same as in the above-described embodiment in the upstream side portion, but is different in the downstream side portion. The configurations, operations, and effects that are not particularly described in the third embodiment are the same as those in the first embodiment, and only differences from the first embodiment will be described below.

FIG. 8 shows the valve open state. The fluid control valve 205 includes a valve seat 511 which is a seat valve, a valve portion 58, a plunger 155 and the like. The yoke 156 of the fluid control valve 205 includes a first annular portion 560 provided at one end portion on the valve portion 58 side, an inclined portion 561, and a second annular portion 562 radially extending from the downstream end portion of the inclined portion 561. And a first tubular portion 563 that extends in the axial direction from the outer peripheral edge of the second annular portion 562. The inflow-side housing 151 includes a valve seat 511 inside which a valve portion 58 that is displaced in the valve closing direction is seated, around the inflow port 510. In the valve closed state, the valve seat 511 is in contact with the valve portion 58 so as to form an annular surface or an annular line. The fluid control valve 205 is an electromagnetic valve device having a configuration in which the pressure of the working fluid acts in the valve opening direction in which the valve portion 58 is separated from the valve seat 511. The fluid control valve 205 opens and closes the internal passage 512 provided in the inflow housing 151 according to the balance state between the fluid pressure received from the working fluid and the magnetic force generated by energization. The inflow side housing 151 is made of a resin material and is welded and joined to the intermediate housing 52. The inflow-side housing 151 incorporates most of the valve portion 58, the support member 59, and the like.

The plunger 155 includes an upstream annular portion 1550 provided at one end of the tubular portion 551 on the valve portion 58 side and a downstream annular portion 552 provided at the other end of the tubular portion 551. .. The upstream annular portion 1550 has the same diameter dimension as the tubular portion 551 and has an upstream opening 550a coaxial with the tubular portion 551 as a through hole. The upstream annular portion 1550 contacts the downstream end of the support member 59 on the surface opposite to the valve portion 58 and supports the support member 59 so as to be axially displaceable. The axial direction is also the moving direction of the valve portion 58. As a result, the support member 59 is axially displaced together with the plunger 155. The downstream passage 552a is not provided in the downstream annular portion 552 of the fluid control valve 205. A fluid passage 553 is provided inside the tubular portion 551. The fluid passage 553 uses the upstream opening 550a as a fluid inlet. The plunger 155 is made of a magnetically permeable material, for example, a magnetic material.

The support member 59 is configured integrally with the valve portion 58 by coupling the valve portion 58. The support member 59 includes an upstream tubular portion 592, a disc-shaped upstream disk portion 590 integrally provided at an upstream end portion of the upstream tubular portion 592, and a downstream end portion of the upstream tubular portion 592. The downstream side tubular portion 593 is integrally provided and has a smaller diameter dimension than the upstream side tubular portion 592. The valve portion 58 is fixed to the upstream side board portion 590. The upstream side tubular portion 592 is provided with a fluid passage 591 that penetrates in the radial direction. At least one fluid passage 591 is provided in the upstream side tubular portion 592. The fluid passage 591 communicates with the internal passage 512 on the upstream side and communicates with the fluid passage 553 on the downstream side via the upstream opening 550a.

The downstream tubular portion 593 is slidably supported in the axial direction while being inserted in the upstream opening portion 560 a provided in the first annular portion 560 of the yoke 156. The support member 59 is restricted from further displacing in the valve opening direction when the downstream end of the upstream tubular portion 592 contacts the first annular portion 560 in the valve open state. Therefore, the downstream tubular portion 593 can be displaced within a predetermined range in the axial direction by the yoke 156, and is regulated to be substantially immovable in the radial direction. The support member 59 is made of a material such as a resin material that is hard to pass magnetism. Therefore, the support member 59 is configured not to form a magnetic circuit.

The valve portion 58 is formed of an elastically deformable material such as rubber. The valve portion 58 is integrally attached to the support member 59 with the shaft portion extending downstream in the axial direction fitted in the through hole of the upstream side board portion 590. The valve portion 58 is provided at a position that axially opposes the valve seat 511 provided on the inflow-side housing 151.

At the start of energization in the valve open state, the distance between the plunger 155 and the yoke 156 on the upstream side is the shortest between the inclined portion 561 and the tubular portion 551. As described above, in the valve open state, the magnetic flux, which is the first route through which the magnetic flux passes between the inclined portion 561 and the tubular portion 551, has a larger magnetic flux than the second route. Also in the fluid control valve 205, when the energization is started in the valve open state, a magnetic path in which the magnetic flux is larger in the first path than in the second path is formed. Further, when energized, a magnetic path through which magnetic flux passes is also formed between the first tubular portion 563 and the downstream annular portion 552.

The first annular portion 560 and the upstream annular portion 1550 are parallel portions that are axially opposed portions and have cross-sectional shapes that extend along each other. The sectional shape relating to the inclined portion and the parallel portion is a longitudinal sectional shape along the axial direction of the plunger 155 and the like. In the valve closed state in which the valve portion 58 is in contact with the valve seat 511, the first annular portion 560 is an upstream side where the downstream side surface 1560b opposite to the valve portion 58 is located on the valve portion 58 side of the upstream side annular portion 1550. It is provided at a position where it comes into contact with the side surface 1550b. The downstream side surface 1560b and the upstream side surface 1550b are portions that face each other in the axial direction and are parallel portions that extend along each other. Therefore, in the valve closed state, a magnetic path that is the second path through which the magnetic flux passes is formed at the portion where the first annular portion 560 and the upstream annular portion 1550 contact.

In the fluid control valve 205 as well, when the valve open state is approached to the closed state and the valve closed state occurs, a reversal phenomenon occurs in which the second path is more dominant than the first path. This is because, when the valve closed state is approached, the first annular portion 560 and the upstream annular portion 1550 forming the parallel portions face each other and are closest to each other between the plunger 155 and the yoke 156 on the upstream side. ..

The cylindrical member 257 is provided with a through hole 2573a that penetrates the outer peripheral wall in the radial direction. The tubular member 257 is provided with a plurality of through holes 2573a which are arranged in the circumferential direction at intervals. The through hole 2573a is an opening elongated in the axial direction and is also called a slit. The through hole 2573a is provided in the tubular member 257 in the entire axial direction from the upstream end portion to the downstream end portion. A rectangular side wall portion is provided between adjacent through holes 2573a and 2573a. The through holes 2573a and the side wall portions are alternately provided over the entire circumference of the tubular member 257. As described above, in the tubular member 257, the lightened portion corresponds to the through hole 2573a, and the remaining portion other than the lightened portion corresponds to the side wall portion.

The inner surface of the side wall portion and a portion of the inner peripheral surface of the tubular member 257 corresponding to the peripheral edge portion of the through hole 2573a form a support portion 2573. A portion of the outer peripheral surface of the tubular member 257 corresponding to the peripheral portion of the through hole 2573a constitutes a separating portion 2572. The supporting portion 2573 is located closer to the central axis of the plunger 155 than the separating portion 2572. The support portion 2573 supports the plunger 155 so as to be slidable in the axial direction closer to the central axis of the plunger 155 than the separating portion 2572. That is, the support portion 2573 supports the plunger 155 so that the outer peripheral surface of the plunger 155 slides in the axial direction. Further, the tubular member 257 may be configured such that the inner surface of the tubular member 257 slidably supports the outer peripheral surface of the plunger 155.

The separating portion 2572 is radially separated from the outer peripheral surface of the plunger 155. With this configuration, the through hole 2573a forms a gap as in the above-described embodiment, so that a foreign substance can be accommodated in this gap as in the above-described embodiment. The support portion 2573 constitutes a gap forming portion that is radially separated from each other and forms a gap. In this way, the tubular member 257 and the plunger 155 form a gap forming portion that is radially separated from each other to form a gap, and a sliding portion that relatively slides in the axial direction.

According to the third embodiment, the tubular member 257 is formed with a plurality of through holes 2573a that penetrate through the tubular member 257 in the radial direction and are arranged at intervals in the circumferential direction. The inner peripheral surface of the tubular member 257 supports the plunger 155 slidably in the axial direction. A portion of the outer peripheral surface of the cylindrical member 257, which corresponds to the peripheral portion of the through hole 2573a, and the outer peripheral surface of the cylindrical member 257 form a gap forming portion. According to this, when foreign matter in the working fluid enters between the plunger 155 and the tubular member 257, the foreign matter can be accommodated in the gap extending in the radial direction at the position where the through hole 2573a is provided.

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

The fluid control valve that can achieve the object disclosed in the specification is not limited to the configuration including the plunger and the tubular member disclosed in the above-described embodiments. The fluid control valve is, for example, a spacing portion that is spaced apart from the inner circumferential surface of the tubular member so as to form a gap, and is located closer to the inner circumferential surface of the tubular member than the spacing portion, and is slidable in the axial direction. It may be configured to include a plunger having a supported portion that is supported so as to be possible. That is, the inner peripheral surface of the tubular member may be a smooth surface, and the outer peripheral surface of the plunger may be formed with irregularities.

The fluid control valve that can achieve the object disclosed in the specification does not limit the first path and the second path to the positions described in the above embodiments. Each of the above-described embodiments may be configured such that the shapes of the plunger and the yoke related to the magnetic path are reversed on the upstream side and the downstream side.

In the fluid control valve of each of the above-described embodiments, the controller 8 controls the ratio of the on-time to the time of one cycle formed by the on-time and the off-time of energization, that is, the duty ratio to energize the electromagnetic coil. It can be configured as a control valve. According to the energization control for such a fluid control valve, it is possible to freely adjust the flow rate of the cooling water flowing through the second flow passage 11.

The fluid control valve capable of achieving the object disclosed in the specification is not limited to the electromagnetic valve capable of controlling the flow rate of the cooling water in the cooling water circuit 1 in which the cooling water of the engine 2 circulates. This fluid control valve is, for example, a solenoid valve that controls the flow rate of a working fluid that can cool a motor, an inverter, a semiconductor device, etc., a solenoid valve that controls the flow rate of a working fluid used for cooling or heating, or an operation of automatic oil or the like. It can be used in solenoid valves that control the flow of oil.

The communication passage 521 in the above-described first embodiment and second embodiment may be a part of the fluid passage leading to the internal passage 520. The fluid control valve may have a main passage provided separately from the communication passage 521.

5, 105, 205... Fluid control valve, 52... Intermediate housing (housing)
55, 155... Plunger, 56... Yoke, 57, 157, 257... Cylindrical member 58... Valve portion, 520... Internal passage, 521... Communication passage (gap), 540... Coil portion 550b... Valve portion, 551... Tubular shape Part (gap forming part, sliding part), 560b...Valve seat part 572,2572... Separation part (gap forming part), 573, 1573... Support part (sliding part)
1573a, 2573a... through hole, 2573... support portion (sliding portion, inner peripheral surface)

Claims (8)

A housing (52) having an internal passage (520) through which a working fluid that is a liquid flows;
A valve portion (550b; 58) that opens and closes the internal passage so as to switch between a valve open state and a valve closed state in which the working fluid is allowed to flow away from the valve seat portion (560b);
A plunger (55; 155) axially displaced between the valve open state and the valve closed state;
A coil portion (540) that generates a magnetic force that drives the plunger in the axial direction when energized;
A yoke (56) that forms a magnetic circuit with the plunger when the power is applied;
A cylindrical member (57; 157; 257) provided so as to cover the outer peripheral surface of the plunger and supporting the plunger slidably in the axial direction;
Equipped with
The tubular member and the plunger are separated from each other in the radial direction to form a gap (521), and a gap forming portion (551, 572; 2572) and a sliding portion that relatively slides in the axial direction ( 551, 573; 1573; 2573). The tubular member is positioned closer to the central axis of the plunger than the spacing portion (572) and the spacing portion (572) that is spaced from the outer peripheral surface of the plunger so as to form the gap. The fluid control valve according to claim 1, further comprising a support portion (573; 1573) that slidably supports the direction. The fluid control valve according to claim 2, wherein the support portion (573) is a recessed portion that is recessed closer to the central axis of the plunger than the spacing portion. A through hole (1573a) and a peripheral portion of the through hole are formed in the tubular member,
The fluid control valve according to claim 2, wherein the support portion (1573) is the peripheral edge portion projecting closer to the central axis of the plunger than the spacing portion. The fluid control valve according to any one of claims 2 to 4, wherein the supporting portion and the separating portion are provided alternately over the entire circumference of the tubular member. The fluid control according to any one of claims 1 to 5, wherein a plurality of the gaps are formed between the tubular member and the plunger, and the gaps are fluid passages communicating with the internal passages. valve. The fluid control valve according to claim 6, wherein the gap is the fluid passage elongated in the axial direction. The cylindrical member (257) is formed with a plurality of through holes (2573a) penetrating in the radial direction and arranged at intervals in the circumferential direction,
An inner peripheral surface (2573) of the tubular member supports the plunger so as to be slidable in the axial direction,
The fluid control valve according to claim 1, wherein a portion of the outer peripheral surface of the tubular member corresponding to the peripheral edge of the through hole and the outer peripheral surface of the tubular member form the gap forming portion.

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