JP2018132090A - Fluid control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid control valve capable of being quickly and surely opened and closed.SOLUTION: A fluid control valve includes a housing 4 having an inflow port 43a and an outflow port 41a for a fluid, a first magnetic body 8 provided with a circulation hole 81 for circulating the fluid, a solenoid B making magnetic flux flow to the first magnetic body 8, a second magnetic body 7 kept into contact with a peripheral edge portion of the circulation hole 81 to close the circulation hole 81 by being attracted to the first magnetic body 8 by the flowing of the magnetic flux generated from the solenoid B, an energization member S for energizing the second magnetic body 7 in a direction to separate from the first magnetic body 7, and a stopper 9 fixed to the housing 4 at a side of the outflow port 41a and preventing the movement of the second magnetic body 7 by energization force of the energization member S. Flow channel throttle portions 45, 92b for throttling a flow channel area in valve opening when the second magnetic body 7 is separated from the first magnetic body 8, are formed between a back face 7a kept into contact with the stopper 9, of the second magnetic body 7 and an inner face of the housing 4.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fluid control valve capable of blocking the flow of fluid from a pump.

  2. Description of the Related Art Conventionally, in a cooling system that cools an internal combustion engine such as an automobile engine, a fluid control valve provided in a circulation passage that circulates cooling water between the internal combustion engine and a heater core by a water pump is known. (For example, refer to Patent Document 1). The fluid control valve of Patent Literature 1 includes a valve seat having a plate-like first magnetic body (in the literature, a fixed yoke) insert-molded in a housing, and a plate-like second magnetic body (in the literature, a strip plate member). There is known a fluid control valve including a valve body and a solenoid that allows a magnetic flux to flow through a first magnetic body. This fluid control valve is provided with a biasing member (in the literature, a coil spring) that biases the valve body toward the valve seat.

  In the fluid control valve of Patent Document 1, the water pump is stopped when the engine is stopped, and the valve body is closed by the urging force of the urging member. When the engine is started, the water pump is driven and water pressure is applied to the valve body. However, the valve body is pressed against the valve seat by the driving force generated by energization of the solenoid and the urging force of the urging member, and the valve closed state is maintained. The When heating is used after the engine is started, the solenoid is de-energized, and when the water pressure acting on the valve body exceeds the urging force of the urging member, the valve body is separated from the valve seat, and the valve becomes open and cooling water Flows into the heater core.

JP 2015-121247 A

  The conventional fluid control valve is kept closed until the water pressure exceeds the urging force of the urging member without energizing the solenoid. For this reason, when the water pressure at the time of starting the engine is low, for example, when there is a request for supplying cooling water from a defroster, a heater core, an EGR cooler, or the like, there is a possibility that the valve cannot be opened immediately. Further, since the valve is always closed when the engine is stopped, the valve body and the valve seat are fixed, and even if an attempt is made to open the valve immediately after the engine is started, it may be difficult to open the valve.

  On the other hand, in the valve open state, even if the solenoid is energized, it does not close until the sum of the driving force of the solenoid and the urging force of the urging member exceeds the water pressure. For this reason, there is a possibility that the valve cannot be closed immediately when it is desired to promote the warm air and to effect the heating, such as when the engine speed is low.

  Therefore, it is desired to provide a fluid control valve that can be opened and closed quickly and reliably.

  The characteristic configuration of the fluid control valve includes a housing having a fluid inlet and outlet, a first magnetic body provided with a flow hole through which the fluid flows, a solenoid that flows magnetic flux to the first magnetic body, A second magnetic body that contacts the peripheral edge of the flow hole and closes the flow hole by being attracted to the first magnetic body by flowing the magnetic flux generated from the solenoid; and the second magnetic body A biasing member that biases the first magnetic body in a direction away from the first magnetic body, and is fixed to the housing on the outlet side, and prevents the second magnetic body from being moved by the biasing force of the biasing member. And a flow path restricting portion having a reduced flow area is formed in a part of the flow path between the back surface of the second magnetic body that contacts the stopper and the inner surface of the housing. There is in point.

  In this configuration, the first magnetic body, the second magnetic body that is attracted to the first magnetic body by energizing the solenoid and closes the flow hole of the first magnetic body, and the second magnetic body are separated from the first magnetic body. And an urging member that urges in a separating direction. That is, when the solenoid is not energized, the fluid control valve is open due to the urging force of the urging member. For this reason, when the fluid pressure at the time of starting the engine is low, even when there is a valve opening request from, for example, a defroster or the like, the valve can be opened quickly and fluid can be circulated. Moreover, since the valve is always open when the engine is stopped, there is no inconvenience that the first magnetic body and the second magnetic body are fixed and difficult to open.

  Further, in this configuration, a flow path restricting portion is formed between the back surface of the second magnetic body and the inner surface of the housing. As a result, when the valve is opened, the back surface of the second magnetic body is always subjected to fluid pressure and the second magnetic body is pressed toward the first magnetic body, so that the fluid pressure acting on the back surface of the second magnetic body is reduced. The solenoid can be swiftly closed by assisting the driving force of the solenoid for attracting the first magnetic body. Therefore, the fluid control valve which can be opened / closed quickly and reliably can be provided.

  According to another characteristic configuration, a reservoir for storing the fluid flowing through the flow passage restricting portion is formed on the side of the second magnetic body in the flow restricting portion so that the inner surface of the housing is recessed. There is in point.

  If a reservoir for storing the fluid flowing through the flow restrictor is provided as in this configuration, the fluid from the reservoir can easily flow through the flow restrictor, so that the second magnetism due to the interruption of fluid flow A decrease in fluid pressure acting on the back of the body can be suppressed. In addition, since the reservoir is formed by recessing the inner surface of the housing, processing is easy. Therefore, the valve can be closed more quickly with a simple configuration.

  According to another characteristic configuration, a fluid pressure receiving portion that receives a pressure of the fluid flowing in from the inflow port is provided between the first magnetic body and the second magnetic body so that the flow hole can be closed. It exists in the point provided facing the obstruction | occlusion surface of a 2 magnetic body.

  If the fluid pressure receiving portion is provided facing the closing surface of the second magnetic body as in this configuration, the fluid pressure acting in the direction of separating the second magnetic body from the first magnetic body acts on the second magnetic body. This can be reduced. As a result, it is possible to close the valve more quickly by reducing the action of the fluid pressure acting in the direction of opening the second magnetic body while applying the fluid pressure to the back surface of the second magnetic body.

It is explanatory drawing of an engine cooling system. It is a longitudinal cross-sectional view which shows the fluid control valve of the open state which concerns on 1st embodiment. It is a longitudinal cross-sectional view which shows the fluid control valve of the closed state which concerns on 1st embodiment. It is the IV-IV arrow line view of FIG. It is a perspective view of the support member concerning a first embodiment. It is a top view of the 2nd housing concerning a first embodiment. It is a figure which shows the control flow of a fluid control valve. It is a longitudinal cross-sectional view which shows the fluid control valve of the open state which concerns on 2nd embodiment. It is a longitudinal cross-sectional view which shows the fluid control valve of the closed state which concerns on 2nd embodiment. It is the longitudinal cross-sectional view which rotated the fluid control valve of FIG. 8 90 degree | times. It is a top view of the 2nd housing concerning a second embodiment.

  Hereinafter, embodiments of a fluid control valve according to the present invention will be described with reference to the drawings. In the present embodiment, an example of the fluid control valve will be described as a fluid control valve V used in a cooling system for an engine E for an automobile. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the scope of the invention.

  As shown in FIG. 1, the cooling system of the engine E is cooled between the engine E and the heater core H, and the first circulation path 1 that circulates cooling water (an example of fluid) between the engine E and the radiator R. A second circulation path 2 that circulates water and a water pump P that supplies cooling water to the engine E are provided. The water pump P in the present embodiment is a mechanical water pump that rotates by obtaining a driving force from a crank pulley (not shown) via a timing belt, and the flow rate changes according to the rotational speed of the engine.

  Outflow passages of cooling water from the radiator R and the heater core H in the first circulation path 1 and the second circulation path 2 are connected to the water pump P via the thermostat valve 3. In the first circulation path 1, the cooling water heated by the engine E is cooled by the radiator R and then returned to the engine E through the thermostat valve 3. In the second circulation path 2, a fluid control valve V is disposed between the engine E and the heater core H, and when the fluid control valve V is in an open state, the cooling water heated by the engine E is used as air in the passenger compartment. Is allowed to flow into the heater core H that warms the heater. At this time, the cooling water cooled by heat exchange with the heater core H is returned to the engine E through the thermostat valve 3.

  On the other hand, when the cooling water is lower than a predetermined temperature (warming-up completion temperature T1), the fluid control valve V is closed to prevent the temperature of the cooling water from being lowered due to heat exchange of the heater core H. When the temperature of the cooling water is low, the thermostat valve 3 is also closed, so that the cooling water does not circulate to the radiator R. For this reason, the temperature rise of the cooling water during the warm-up operation of the engine E can be promoted, and the fuel efficiency can be improved.

(First embodiment)
The first embodiment will be described below with reference to the drawings.

  As shown in FIGS. 2 to 3, the fluid control valve V includes a housing 4, a stopper 9 fixed to the housing 4, a shaft member 5, a support member 6 that supports the shaft member 5, and a support member 6. A coil spring S (an example of an urging member) housed inside, a first magnetic body 8 as a valve seat, a solenoid B for flowing a magnetic flux through the first magnetic body 8, and a valve formed integrally with the shaft member 5 And a second magnetic body 7 as a body. In this embodiment, the 1st magnetic body 8, the shaft member 5, and the 2nd magnetic body 7 are comprised with magnetic bodies, such as iron. The housing 4, the support member 6, and the stopper 9 are made of nonmagnetic resin, stainless steel, or the like.

  The housing 4 includes a first housing 41 in which the stopper 9 is fixed inside, a second housing 42 in which the first magnetic body 8 is insert-molded, and a third housing 43 in which the support member 6 is fixed inside. ing. The first housing 41, the second housing 42, and the third housing 43 are connected to each other by bolt fastening, adhesion, press fitting, or the like. Note that any one of the first housing 41, the second housing 42, and the third housing 43 may be integrally formed, or may be constituted by four or more divisions.

  In the first housing 41, a cooling water outlet 41 a along the axis X of the shaft member 5 is formed in a cylindrical shape. In addition, a plurality of (three in this embodiment) extending portions 44 are formed to extend from the inner surface of the first housing 41, and a cylindrical stopper 9 is integrally formed at the end of the extending portion 44. Yes. The extending portion 44 and the stopper 9 may be separate members that are fixed to the first housing 41 by bonding or the like.

  As shown in FIG. 4, the extending portion 44 is formed in a direction in which the vicinity of the center of the bottom surface (the surface of the inner surface of the first housing 41 facing the back surface 7 a of the second magnetic body 7) is separated from the second magnetic body 7. A water passage 45 formed as a depression (an example of a flow path narrowing portion) and the water passage 45 are formed on both sides in the circumferential direction and on the second magnetic body 7 side in the radial direction. And a side wall portion 46. At the time of valve opening when the movement of the second magnetic body 7 due to the urging force of the coil spring S is blocked by the stopper 9, the bottom surface of the side wall portion 46 (the same surface as the bottom surface 92 a of the stopper 9) is on the back surface 7 a of the second magnetic body 7. It contacts and the leakage of the cooling water to the side of the water passage 45 is prevented (see FIG. 2). Thus, a water passage 45 with a reduced flow area is formed in a part of the flow path between the back surface 7a contacting the stopper 9 of the second magnetic body 7 and the inner surface of the first housing 41. The bottom surface of the extended portion 44 of the housing 41 is formed to be recessed.

  As shown in FIGS. 2 and 4, in the portion of the water passage 45 located radially outside the second magnetic body 7, the direction in which the bottom surface of the extending portion 44 is separated from the second magnetic body 7. A recess 45a that is further recessed is formed. The reservoir 45a has a function of storing cooling water flowing through the water passage 45 when the valve is opened. The reservoir 45a may be omitted.

  The stopper 9 has an annular flange 92 connected to the extension 44 of the first housing 41. In the annular flange 92, a connection passage 92b (an example of a flow passage restricting portion) connected to the water passage 45 is opposed to the bottom surface 92a (the back surface 7a of the second magnetic body 7 on the inner surface of the first housing 41). The surface) is recessed in the direction away from the second magnetic body 7. Similar to the water passage 45, the connection passage 92 b also has a function of reducing the flow passage area when the second magnetic body 7 is opened from the first magnetic body 8. A through hole 92 c is formed at the center of the annular flange 92.

  Accordingly, as shown in FIG. 2, when the second magnetic body 7 is opened, the cooling water flows into the reservoir 45a of the water passage 45, and the water passage 45, the connection passage 92b, and the through-hole portion 92c in this order. Circulate. At this time, the back surface 7a of the second magnetic body 7 receives water pressure (fluid pressure) by the cooling water flowing through the water passage 45 and the connection passage 92b, and the second magnetic body 7 is pressed toward the first magnetic body 8. The Since the urging force by the coil spring S is set to be larger than this water pressure, the valve-open state is maintained when the solenoid B is not energized.

  2 to 3, the flat first magnetic body 8 is insert-molded in the second housing 42. Further, a fixed yoke 11 of a solenoid B described later is integrally formed on the side of the second housing 42.

  In the third housing 43, a cooling water inlet 43 a along the axis X of the shaft member 5 is formed in a cylindrical shape. A plurality of (three in the present embodiment) flat plate portions 43b are formed on the inner peripheral surface of the third housing 43 so as to extend, and a bottomed tube is formed at the tip of the flat plate portion 43b. A support member 6 is integrally formed with the first magnetic body 8.

  The shaft member 5 is supported by the support member 6 at one end side so as to be movable in the housing 4. Since the outer surface of the shaft member 5 is in sliding contact with the inner surface of the support member 6, the movement of the shaft member 5 is guided to the inner surface of the support member 6. Further, the other end of the shaft member 5 extends to the outlet 41a side from the first magnetic body 8, and the second magnetic body 7 is integrally formed at the other end. The shaft member 5 and the second magnetic body 7 are not integrally formed, and a through hole is provided in the center of the second magnetic body 7, and the other end of the shaft member 5 is fixed (press-fit) to the through hole. It may be configured to do so.

  The support member 6 is fixed to the third housing 43 on the inflow port 43 a side, and the side wall 61 enters the flow hole 81 of the first magnetic body 8. That is, the side wall 61 secures the sliding contact region of the shaft member 5 and enhances the support function of the support member 6 with respect to the shaft member 5.

  As shown in FIG. 5, the support member 6 includes a cylindrical main body 62 and an annular portion 63 (fluid) in which the opening end on the second magnetic body 7 side of the cylindrical main body 62 is radially expanded outward. An example of a pressure receiving portion). The cylindrical main body 62 has a bottom portion 64 with a small hole 64a formed at the center, a first standing portion 65 standing from the bottom portion 64 along the axis X direction, and a diameter gradually increasing from the first standing portion 65. And a second standing portion 67 erected along the axis X direction from the tapered portion 66 so as to have the same diameter as the maximum diameter of the tapered portion 66. That is, the side wall 61 of the support member 6 includes the first standing portion 65, the tapered portion 66, and the second standing portion 67. The shaft member 5 described above is configured to be movable in the region of the second standing portion 67.

  The annular portion 63 is disposed between the first magnetic body 8 and the second magnetic body 7 (see FIG. 2). On the inner surface of the annular portion 63, a groove portion 68 that is recessed outward in the radial direction from the shaft member 5 is formed. A plurality of grooves 68 are provided at equal intervals along the circumferential direction (four in the present embodiment), and extend along the axis X direction over the region of the annular portion 63 and the second standing portion 67. Has been placed.

  As shown in FIGS. 2 to 3, the coil spring S abuts against the end surface of the shaft member 5 and the bottom portion 64 of the support member 6 while being guided by a convex portion 52 formed at the other end of the shaft member 5. In this state, it is accommodated inside the support member 6. In this embodiment, the inside of the 1st standing part 65 and the taper part 66 of the support member 6 becomes the accommodation space of the coil spring S (refer FIG. 5). The coil spring S urges the shaft member 5 (second magnetic body 7) toward the outlet 41a so that the second magnetic body 7 is separated from the first magnetic body 8.

  The first magnetic body 8 is provided with a flow hole 81 through which cooling water flows, and is disposed between the second magnetic body 7 and the support member 6 along the axial direction X. As shown in FIG. 6, the first magnetic body 8 includes an annular peripheral edge 84 around the circulation hole 81 and a circulation hole 81 formed on the radially inner side of the peripheral edge 84. The peripheral edge 84 functions as a valve seat with which a protrusion 72 of the second magnetic body 7 described later comes into contact. The first magnetic body 8 is formed in a plate shape integrated with the fixed yoke 11 of the solenoid B, and is insert-molded in the second housing 42 together with the fixed yoke 11.

  The first magnetic body 8 has a pair of arm portions 82 extending radially inward from the peripheral edge portion 84 of the flow hole 81. Each arm portion 82 has a pair of connecting portions 82a formed in a straight line connected to the peripheral edge portion 84 of the flow hole 81, and an arc-shaped portion 82b that connects the ends of the pair of connecting portions 82a in an arc shape. doing. The inner peripheral surface of the arc-shaped portion 82b overlaps the outer peripheral surface of the shaft member 5 in the radial direction with the nonmagnetic support member 6 interposed. Further, the first magnetic body 8 is provided with a pair of magnetic flux restricting portions 83 at a portion where the magnetic flux passes in the peripheral portion 84. The pair of arm portions 82 are provided so as to extend from regions on both sides of the peripheral edge portion 84 that sandwich the pair of magnetic flux restricting portions 83. The width L1 of the connecting portion 82a of the arm portion 82 (the portion extending in the radial direction from the peripheral edge portion 84 of the arm portion 82) is formed larger than the width L2 of the magnetic flux restricting portion 83. Further, in the present embodiment, the magnetic flux density is increased by forming the width L3 of the arc-shaped portion 82b of the arm portion 82 smaller than the width L1 of the connecting portion 82a and the width L2 of the magnetic flux restricting portion 83. Note that the width L3 of the arc-shaped portion 82b may be formed larger than the width L2 of the magnetic flux restricting portion 83 in the same manner as the width L1 of the connecting portion 82a.

  As shown in FIGS. 2 to 3, the solenoid B includes a plate-like fixed yoke 11 made of a magnetic material such as iron, an electromagnetic coil 12 that generates a magnetic field when energized, and an electromagnetic coil 12 connected to an external drive circuit. And a socket 13 electrically connected to (not shown). That is, when the electromagnetic coil 12 is energized, a magnetic flux flows through the first magnetic body 8 via the fixed yoke 11.

  The second magnetic body 7 functions as a valve body integrally formed at the other end of the shaft member 5 so as to be coaxial with the shaft core X of the shaft member 5. The second magnetic body 7 includes a disk-shaped closing surface 71 that can close the flow hole 81 of the first magnetic body 8, and a cylindrical protrusion that protrudes from the outer periphery of the closing surface 71 toward the first magnetic body 8. Part 72. When the valve is closed, the protrusion 72 comes into contact with the peripheral edge 84 of the flow hole 81, and the closing surface 71 of the second magnetic body 7 closes the flow hole 81 of the first magnetic body 8 (see FIG. 3).

  On the other hand, when the valve is opened, the annular flange 92 of the stopper 9 is in contact with the radially inner portion of the back surface 7a of the second magnetic body 7 to prevent the movement of the second magnetic body 7 (see FIG. 2). . At this time, the cooling water flows from the inflow port 43a toward the outflow port 41a with the space formed between the extending portion 44 of the first housing 41 from the radially outer side of the second magnetic body 7 as a main flow path. In addition, the cooling water flows into the pool portion 45a of the water passage 45 and forms a sub-flow passage through which the water passage 45 of the extension portion 44, the connection passage 92b of the stopper 9, and the through hole portion 92c of the stopper 9 are circulated in this order. Has been. In the present embodiment, the stopper 9 is disposed on the radially inner side with respect to the projecting portion 72 of the second magnetic body 7 and is formed on the radially outer side with respect to the closing surface 71 of the second magnetic body 7. The increase in the distribution resistance of the road is suppressed.

(Control example)
FIG. 7 shows an example of a control method using the fluid control valve V described above. When the engine E is started, the solenoid B is not energized, the second magnetic body 7 is separated from the first magnetic body 8 by the biasing force of the coil spring S, and the fluid control valve V is opened ( (See FIG. 2). First, it is determined whether or not there is a valve opening request from a defroster or the like (# 01). When there is no valve opening request (# 01 No determination), by energizing the solenoid B, the second magnetic body 7 is attracted to the first magnetic body 8 against the urging force of the coil spring S, and the second magnetic body 7 is The fluid control valve V is closed in contact with the first magnetic body 8 (see # 02, FIG. 3). As a result, warm-up of the engine E is promoted. Next, when the coolant temperature becomes equal to or higher than the warm-up completion temperature T1 (# 03 Yes determination), energization of the solenoid B is stopped and the fluid control valve V is opened (# 04). If the coolant temperature has not reached the warm-up completion temperature T1 (# 03 No determination), the closed state of the fluid control valve V is maintained (# 02).

  On the other hand, when there is a valve opening request (# 01 Yes determination), priority is given to the control of fluid supply with high urgency, and the fluid control valve V is kept open while the solenoid B is not energized. Cooling water is circulated (# 05). When the valve opening request is canceled (# 06 Yes determination), when the coolant temperature has not reached the warm-up completion temperature T1, the fluid control valve V is closed again to promote the warm-up (# 02- # 04) If the cooling water temperature has reached the warm-up completion temperature T1, the routine proceeds to a normal operation mode in which the valve E is maintained and the cooling water is circulated through the engine E.

  When there is a heating request after shifting to the normal operation mode (# 07 Yes determination), when the rotational speed of the engine E is in the low rotation range (Rrpm or less) and the cooling water is equal to or lower than the predetermined temperature T2 (# 08), the solenoid B is energized and the fluid control valve V is closed (# 09). As a result, the temperature of the cooling water rises within a range that does not affect the operation of the engine E. When the cooling water becomes higher than the predetermined temperature T2 (# 08 No determination), if the energization of the solenoid B is stopped and the fluid control valve V is opened (# 10), the high-temperature cooling water circulates in the heater core H. Therefore, the room can be warmed up quickly. Further, when the rotational speed of the engine E becomes larger than the low speed region (# 08 No determination), in order to give priority to cooling of the engine E, the energization of the solenoid B is stopped and the fluid control valve V is opened ( # 10) Heat is exchanged between the radiator R and the heater core H to lower the temperature of the cooling water.

  As another control method, for example, a mode in which the fluid control valve V is separately provided in each of the heater core H, the EGR cooler, the transmission, and the like, and the opening / closing operation is repeated as necessary is assumed. Thus, in the fluid control valve V that frequently opens and closes, even when the water pressure cannot be controlled like the mechanical water pump P in which the flow rate changes in accordance with the rotational speed of the engine E, It is desirable to be able to quickly open and close regardless of water pressure.

  As shown in FIG. 2, the second magnetic body 7 is biased in a direction away from the first magnetic body 8, and when the solenoid B is not energized, the fluid control valve V is in the valve open state. For this reason, even when there is a valve opening request from a defroster or the like when the water pressure is low, such as when the engine E is started, the valve can be opened quickly and the coolant can be circulated. Moreover, since the valve is always open when the engine is stopped, there is no inconvenience that the second magnetic body 7 and the first magnetic body 8 are fixed and difficult to open.

  As shown in FIGS. 2 and 6, the shaft member 5 in which the second magnetic body 7 is integrally formed at the other end is provided at a position close to the arm portion 82 of the first magnetic body 8. Therefore, when the solenoid B is energized, a magnetic circuit is formed from the first magnetic body 8 to the second magnetic body 7 via the shaft member 5, and the second magnetic body 7 is attracted to the first magnetic body 8. The At this time, since the width L3 of the arc-shaped portion 82b of the arm portion 82 is formed smaller than the width L1 of the connecting portion 82a and the width L2 of the magnetic flux restricting portion 83, the magnetic flux density of the arc-shaped portion 82b can be increased ( (See FIG. 6). Further, if the width L1 of the connecting portion 82a of the arm portion 82 of the first magnetic body 8 is formed to be larger than the width L2 of the magnetic flux restricting portion 83, the magnetic flux can easily flow through the arm portion 82, It is possible to increase the amount of magnetic flux flowing through the magnetic body 7. As a result, the attractive force between the first magnetic body 8 and the second magnetic body 7 is increased, and the valve opening state can be shifted to the valve closing state with a small amount of electric power.

  As shown in FIGS. 2 and 5, an annular portion 63 of the support member 6 that receives the pressure of the cooling water flowing from the inflow port 43 a is provided between the first magnetic body 8 and the second magnetic body 7. The first magnetic body 8 is provided so as to face the closing surface 71 of the second magnetic body 7 that can close the flow hole 81 of the first magnetic body 8. Since the annular portion 63 of the support member 6 receives the water pressure, it is possible to reduce the water pressure acting on the closing surface 71 and acting in the direction of separating the second magnetic body 7 from the first magnetic body 8. . As a result, the fluid control valve V can be quickly shifted from the open state to the closed state.

  Moreover, as shown in FIGS. 2 and 4, a water passage that narrows the flow path area between the back surface 7 a of the second magnetic body 7 and the inner surface of the first housing 41 (the extension portion 44 and the stopper 9) when the valve is opened. 45 and a connection passage 92b are formed. As a result, the back surface 7a of the second magnetic body 7 receives water pressure and the second magnetic body 7 is pressed toward the first magnetic body 8, so that the water pressure acting on the back surface 7a of the second magnetic body 7 is the first. The driving force of the solenoid B for adsorbing to the magnetic body 8 can be assisted to close the valve more quickly. If the reservoir 45a for storing the cooling water flowing through the water passage 45 is provided as in the present embodiment, the cooling water from the reservoir 45a easily flows through the water passage 45, so that the circulation of the cooling water is interrupted. The fall of the water pressure which acts on the back surface 7a of the 2nd magnetic body 7 by that can be suppressed.

  Further, since the shaft member 5 fixed to the other end of the second magnetic body 7 is guided by the support member 6, the movement of the second magnetic body 7 is smooth without causing the shaft member 5 to shake. The opening and closing operation becomes stable. In this embodiment, as shown in FIG. 5, since the groove portion 68 is provided on the inner surface of the support member 6 and the small hole 64 a is provided on the bottom portion 64, foreign matter is mixed between the shaft member 5 and the support member 6. Even in this case, the foreign matter can be discharged from the groove 68 to the outside of the support member 6 through the small hole 64a. As a result, the movement of the shaft member 5 becomes smooth, and the opening / closing operation of the second magnetic body 7 fixed to the end of the shaft member 5 is stabilized.

(Second embodiment)
The second embodiment will be described below with reference to the drawings. In addition, since the control method and an effect are the same as that of embodiment mentioned above, description is abbreviate | omitted. Detailed description of the same configuration as that of the first embodiment is omitted.

  As shown in FIGS. 8 to 10, the fluid control valve VA is accommodated in the housing 4A, a stopper 9A fixed to the housing 4A, a guide member 6A fixed to the housing 4A, and the guide member 6A. A coil spring SA (an example of an urging member), a first magnetic body 8A as a valve seat, a solenoid BA for flowing a magnetic flux through the first magnetic body 8A, and a second magnetic body 7A as a valve body are provided. Yes. In the present embodiment, the first magnetic body 8A and the second magnetic body 7A are made of a magnetic body such as iron. The housing 4A, the guide member 6A, and the stopper 9A are made of a nonmagnetic resin, stainless steel, or the like.

  The housing 4A includes a first housing 41A in which the stopper 9A is fixed on the inside, a second housing 42A in which the first magnetic body 8A is insert-molded, and a third housing 43A in which the guide member 6A is fixed on the inside. ing.

  The first housing 41A has a plurality of (three in the present embodiment) extending portions 44A extending from the inner surface of the first housing 41A, and a cylindrical stopper 9A is formed at the end of the extending portion 44A. Are integrally formed. Since the extending portion 44A and the stopper 9A have the same configuration as the extending portion 44 and the stopper 9 in the first embodiment, description thereof is omitted. That is, the water passage 45A and the reservoir 45Aa of the extension portion 44A, the connection passage 92Ab and the through-hole portion 92Ac of the stopper 9A are respectively the water passage 45 and the reservoir portion 45a of the extension portion 44 and the stopper 9 in the first embodiment. This corresponds to the connection passage 92b and the through-hole portion 92c. Moreover, since the second housing 42A has the same configuration as the second housing 42 in the first embodiment, the description thereof is omitted.

  As shown in FIG. 10, a plurality of (two in this embodiment) curved plate portions 43Ab arranged along the axis XA are extended and formed on the inner peripheral surface of the third housing 43A. A guide member 6A is integrally formed at one end of the curved plate portion 43Ab. The connection portion of the curved plate portion 43Ab with the third housing 43A is provided on the inflow port 43Aa side of the first magnetic body 8A, and the curved plate portion 43Ab enters the flow hole 81A of the first magnetic body 8A. The guide member 6A is disposed closer to the outlet 41Aa than the first magnetic body 8A.

  6 A of guide members are comprised by the bottomed cylinder shape which has the bottom part 64A and the cylinder part 62A connected to the outer periphery of the bottom part 64A. The outer surface of the cylindrical portion 62A of the guide member 6A and a part of the outer surface of the curved plate portion 43Ab are in sliding contact with the inner surface of the cup-shaped second magnetic body 7A to guide the movement of the second magnetic body 7A. As shown in FIG. 11, the guide member 6A has a plurality of groove portions 68A (four locations in the present embodiment) formed at equal intervals along the circumferential direction in which the outer surface of the cylindrical portion 62A is recessed radially inward. A rising portion 82A of the first magnetic body 8A described later is inserted into the groove 68A. The curved plate portion 43Ab is disposed between the outer surfaces of the pair of adjacent groove portions 68Aa and 68Ab, and the thickness of the curved plate portion 43Ab is set equal to the thickness of the groove portions 68Aa and 68Ab.

  As shown in FIGS. 8 to 10, the bottom portion 64A (an example of the fluid pressure receiving portion) of the guide member 6A is opposed to the closing surface 71A of the second magnetic body 7A, and the cooling water flowing in from the inflow port 43Aa. It is configured to receive pressure. A small hole 64Aa is formed in the bottom 64A of the guide member 6A. When a foreign substance is mixed between the guide member 6A and the second magnetic body 7A, the foreign substance is discharged from the groove 68A of the guide member 6A to the outside of the guide member 6A through the small hole 64Aa.

  As shown in FIGS. 8 to 10, the coil spring SA is housed inside the guide member 6 </ b> A in contact with the bottom 64 </ b> A of the guide member 6 </ b> A and the closing surface 71 </ b> A of the second magnetic body 7 </ b> A. The coil spring SA urges the second magnetic body 7A toward the outlet 41Aa so that the second magnetic body 7A is separated from the first magnetic body 8A. A cylindrical member that accommodates the coil spring SA may be formed to extend from the bottom 64A of the guide member 6A.

  The first magnetic body 8A is provided with a circulation hole 81A through which cooling water flows. As shown in FIG. 11, an annular peripheral edge portion 84A around the circulation hole 81A functions as a valve seat with which a flange portion 7d of the second magnetic body 7A described later comes into contact. The first magnetic body 8A is formed in a plate shape integrated with the fixed yoke 11A of the solenoid BA, and is insert-molded in the second housing 42A together with the fixed yoke 11A.

  The first magnetic body 8A has a plurality of (four in this embodiment) rising portions 82A that are vertically provided along the axial center XA direction from the peripheral edge portion 84A of the flow hole 81A. The rising portion 82A faces the inner surface of the second magnetic body 7A while being inserted into the groove 68A of the guide member 6A (see FIG. 10). Further, the first magnetic body 8A is provided with a plurality of magnetic flux restricting portions 83A having a reduced width at a portion of the peripheral portion 84A through which the magnetic flux passes. The pair of rising portions 82 </ b> Aa and 82 </ b> Ab are provided so as to extend from regions on both sides sandwiching one magnetic flux constriction portion 83 </ b> A in the peripheral portion 84. This increases the magnetic flux density of the rising portion 82A, so that the amount of magnetic flux flowing through the second magnetic body 7A can be increased. As a result, the attractive force between the first magnetic body 8A and the second magnetic body 7A increases, and the valve opening state can be shifted to the valve closing state with a small amount of electric power.

  Since the solenoid BA has the same configuration as the solenoid B in the first embodiment, the description thereof is omitted.

  As shown in FIGS. 8 to 10, the second magnetic body 7 </ b> A is formed in a cup shape and functions as a valve body. The second magnetic body 7A includes a bottom wall portion 7b, a peripheral wall portion 7c extending from the bottom wall portion 7b toward the first magnetic body 8A, and a flange portion in which an end portion of the peripheral wall portion 7c is expanded radially outward. 7d. The bottom wall 7b of the second magnetic body 7A has a closing surface 71A that can close the flow hole 81A of the first magnetic body 8A. When the valve is closed, the flange portion 7d comes into contact with the peripheral edge portion 84A of the flow hole 81A, and the closing surface 71A of the second magnetic body 7A closes the flow hole 81A of the first magnetic body 8A (see FIG. 9).

  On the other hand, when the valve is opened, the annular flange 92A of the stopper 9A abuts against the radially inner portion of the back surface 7Aa of the closing surface 71A of the second magnetic body 7A to prevent the movement of the second magnetic body 7A ( FIG. 8 and FIG. 10). At this time, the cooling water flows from the inflow port 43Aa toward the outflow port 41Aa using the space formed between the extending portion 44A of the first housing 41A from the radially outer side of the second magnetic body 7A as a main flow path. In addition, cooling water flows into the reservoir 45Aa of the water passage 45A, and a sub-flow passage is also formed in which the water passage 45A of the extension portion 44A, the connection passage 92Ab of the stopper 9A, and the through-hole portion 92Ac of the stopper 9A are circulated in this order. Has been.

[Other Embodiments]
(1) The annular portion 63 of the support member 6 and the bottom portion 64A of the guide member 6A as the fluid pressure receiving portion in the above-described embodiment may be omitted. Even in this case, the water pressure is applied to the back surfaces 7a and 7Aa of the second magnetic bodies 7 and 7A by the water passages 45 and 45A of the extending portions 44 and 44A as the flow passage restricting portions and the connection passages 92b and 92Ab of the stoppers 9 and 9A. By acting, it is possible to realize quick valve closing.
(2) The water passages 45, 45A of the extending portions 44, 44A and the connection passages 92b, 92Ab of the stoppers 9, 9A as the flow restrictors in the embodiment described above are recessed in the back surface 7a of the second magnetic body 7. May be formed.
(3) In the second embodiment, not only the groove portion 68A of the guide member 6A into which the rising portion 82A of the first magnetic body 8A is inserted, but a different groove portion recessed inward in the radial direction may be further provided. As a result, even when foreign matter is mixed between the guide member 6A and the second magnetic body 7A, the foreign matter can be reliably discharged to the outside of the guide member 6A.
(4) In the curved plate portion 43Ab of the guide member 6A in the second embodiment, a through hole may be formed in a portion closer to the stopper 9A than the first magnetic body 8A. In this case, when the valve is opened, the cooling water can be circulated from the through hole to the extending portion 44A of the first housing 41A to reduce the flow resistance in the main flow path.
(5) The second magnetic bodies 7 and 7A in the above-described embodiment may be partially covered with resin without exposing the entire region.
(6) The inflow ports 43a and 43Aa and the outflow ports 41a and 41Aa in the above-described embodiment may be arranged by shifting the axes X and XA.
(7) The pump that circulates fluid in the flow path in which the fluid control valves V and VA are arranged is not limited to the water pump P that supplies the cooling water of the engine E, and may be an oil pump that circulates engine oil. It may be good or used for purposes other than vehicles. Further, the water pump P may be an electric pump using a three-phase AC motor or the like instead of a mechanical pump.

  The present invention can be used for a fluid control valve capable of blocking the flow of fluid.

4, 4A Housing 5 Shaft member 6 Support member 6A Guide member 7, 7A Second magnetic body 7a, 7Aa Back surface 8, 8A First magnetic body 9, 9A Stopper 41a, 41Aa Outlet port 43a, 43Aa Inlet port 45, 45A Water passage (Flow path restriction)
45a, 45Aa Reservoir 63 Annular part (fluid pressure receiving part)
64A Bottom (fluid pressure receiving part)
71, 71A Blocking surface 81, 81A Circulation hole 84, 84A Peripheral portion 92b, 92Ab Connection passage (flow passage restricting portion)
B, BA Solenoid S, SA Coil spring (biasing member)
V, VA Fluid control valve

Claims (3)

A housing having a fluid inlet and outlet;
A first magnetic body provided with a flow hole through which the fluid flows;
A solenoid for flowing magnetic flux through the first magnetic body;
A second magnetic body that is attracted to the first magnetic body by flowing the magnetic flux generated from the solenoid, and closes the flow hole by contacting the peripheral edge of the flow hole;
A biasing member that biases the second magnetic body in a direction away from the first magnetic body;
A stopper that is fixed to the housing on the outlet side and prevents movement of the second magnetic body due to the biasing force of the biasing member,
A fluid control valve in which a flow passage restricting portion with a reduced flow passage area is formed in a part of a flow passage between a back surface of the second magnetic body that contacts the stopper and an inner surface of the housing.   The reservoir part which stores the said fluid which distribute | circulates to the said flow-path restricting part is formed in the side of the said 2nd magnetic body in the said flow-flow restricting part so that the said inner surface of the said housing may be depressed. The fluid control valve described. Between the first magnetic body and the second magnetic body, a fluid pressure receiving portion that receives the pressure of the fluid flowing from the inlet port closes the flow hole, and the closing surface of the second magnetic body The fluid control valve according to claim 1, wherein the fluid control valve is provided so as to be opposed to the fluid.

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