JP2013119893A - Flow rate switching device, and cooling system for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow rate switching device using solenoid valves, and maintaining not only a fully open condition and a fully closed condition but also a rate of valve opening therebetween.SOLUTION: This flow rate switching device 1 includes a first solenoid valve 5 and a second solenoid valve 7 which are stored in a case body 3. The first solenoid valve 5 includes a first valve element 5a, and a first electromagnet 5h to drive the first valve element 5a for opening/closing. The first valve element 5a is movably stored in a direction approaching and separating with respect to the bottom surface 3b of the case body 3, and is formed with a first opening 5b to overlap with a part facing the inflow port 3c of the case body 3 and a second opening 5c provided in a part not facing the inflow port 3c. The second solenoid valve 7 has a second valve element 7a, and a second electromagnet 7h to drive the second valve element 7a for opening/closing. The second valve element 7a is formed to have a size closing the first opening 5b, and is movably stored in a direction approaching and separating with respect to the first valve element 3a between the first valve element 5a and the ceiling surface 3d of the case body 3.

Description

  The present invention relates to an electromagnetic flow rate switching device and an internal combustion engine cooling system using the same.

  In an internal combustion engine such as a vehicle engine, cooling water is circulated between the internal combustion engine and various heat exchangers (a radiator, a heater core, etc.) to cool the internal combustion engine and to generate heat generated in the internal combustion engine. A cooling system is provided for use in a heater or the like.

  In such a cooling system, in order to selectively distribute the heat generated in the internal combustion engine to each heat exchanger, an electric drive valve for controlling the flow rate of the cooling water is provided in the cooling water circulation circuit. (For example, Patent Document 1).

  In the cooling system of Patent Document 1, an electric valve (a driving valve driven by an electric motor) is disposed on a circulation circuit for circulating cooling water flowing out from an internal combustion engine to a radiator, and the flow rate of the cooling water flowing to the radiator by the electric valve. Is controlled.

  However, the cooling system of Patent Document 1 uses a motor-operated valve as an electric drive valve, and thus has a drawback that the response speed of the electric drive valve is slow and power consumption is large.

  As a technique for solving this drawback, a cooling system using an electromagnetic valve (a driving valve driven by an electromagnetic force of an electromagnet) as an electric driving valve is known (for example, Patent Document 2). In the cooling system of Patent Document 2, an electromagnetic valve is disposed at the cooling water inlet of the internal combustion engine, and the flow rate of the cooling water flowing into the internal combustion engine is controlled by the electromagnetic valve.

JP 2005-90480 A JP 2008-223615 A

  However, the electromagnetic valve has the advantages of a faster response speed and lower power consumption than the motor-operated valve, but has the disadvantage that it can only hold either the fully open state or the fully closed state.

  FIG. 9 is a side sectional view of a conventional solenoid valve. As shown in FIG. 9, the conventional solenoid valve 100 includes a case body 101, a solenoid valve main body 103, and a spring 105.

  The case body 101 has an internal space 101a. In the internal space 101a, an inflow hole 101c through which cooling water flows is formed in a part of the bottom surface 101b, and an outflow hole 101e through which cooling water flows out is formed in the ceiling surface 101d.

  The solenoid valve body 103 includes a valve body 103a, a magnetic path member 103c that forms a magnetic path in cooperation with the valve body 103a, and a coil 103b that generates a magnetic flux B10 that passes through the magnetic path when energized. Yes.

  The valve body 103a is formed in a plate shape by a magnetic body, and is movably accommodated in a direction P10 in contact with and away from the bottom surface 101b in a posture facing the bottom surface 101b in the internal space 101a. An opening 103d is formed in the valve body 103a at a portion not facing the inflow hole 101c. The valve body 103a is closed by contacting the bottom surface 101b and closing the opening 103d, and is opened by opening the opening 103d away from the bottom surface 101b.

  The magnetic path member 103c is formed in an annular shape so as to surround the inflow hole 101c, and is disposed on the bottom surface 101b so that a facing surface 103e facing the valve body 103a constitutes the bottom surface 101b. A coil housing recess 103f is formed on the facing surface 103e along the circumferential direction. The coil 103b is housed in the coil housing recess 103f so as to be wound around the inflow hole 101c.

  The spring 105 urges the valve body 103a toward the bottom surface 101b, and is housed between the valve body 103a and the ceiling surface 101d.

  The electromagnetic valve 100 is closed (ie, fully closed) / opened (ie, fully opened) by energization / non-energization of the coil 103b. That is, when the coil 103b is energized, a magnetic flux B10 passing through the magnetic path is generated, the valve body 103a and the coil housing recess 103c are magnetized by the magnetic flux B10, and the valve body 103a is generated by the magnetic attractive force generated between them. Is attracted to the coil housing recess 103c, and the valve body 103a is closed (that is, the solenoid valve 100 is closed). On the other hand, when the coil 103b is de-energized, the magnetic flux in the magnetic path disappears and the magnetic attractive force disappears, and the valve body 103a is separated from the coil housing recess 103c by the inflow pressure of the fluid flowing in from the inflow hole 101c. The body 103a opens (that is, the solenoid valve 100 opens). Thus, the conventional solenoid valve 100 can only hold either the fully open state or the fully closed state.

  As described above, since the conventional solenoid valve can only hold either the fully open state or the fully closed state, there is a drawback in that the flow rate of the cooling water flowing out from the solenoid valve changes suddenly when the solenoid valve is opened or closed. Therefore, for example, the cooling system of Patent Document 2 has a drawback that the temperature Tin of the cooling water in the internal combustion engine rapidly decreases at the time t1 when the electromagnetic valve is switched, as shown in FIG.

  In FIG. 10, for example, in the cooling system of Patent Document 2, the change in the temperature Tin of the internal combustion engine during switching of the solenoid valve and the cooling water outside the internal combustion engine (for example, near the cooling water outlet of the internal combustion engine). The change in temperature Tout is shown. The horizontal axis in FIG. 10 indicates time t, and the vertical axis indicates the temperature of the cooling water.

  In FIG. 10, during the operation of the internal combustion engine, the electromagnetic valve is switched from fully closed (closed) to fully open (opened) at time t1. When the time t is t0 << t <t1, the solenoid valve is in the fully closed state, so that the cooling water does not circulate in the internal combustion engine. Therefore, the temperature Tin of the cooling water inside the internal combustion engine (cooling water accumulated inside) rises, and the temperature Tout of the cooling water outside the internal combustion engine remains at the low temperature T3.

  When the solenoid valve is switched from fully closed to fully open at time t = t1, the flow rate of cooling water flowing from the radiator into the internal combustion engine increases rapidly. Thus, when the time t is t> t1, the temperature Tin of the cooling water inside the internal combustion engine suddenly decreases from T1 to T2, and the temperature Tout of the cooling water outside the internal combustion engine increases. And each temperature Tin and out will be in an equilibrium state, and will become the same temperature.

  As described above, the conventional cooling system using the electromagnetic valve has a drawback that the temperature of the cooling water in the internal combustion engine rapidly increases when the electromagnetic valve is switched between open and closed.

  Accordingly, the present invention has been made in view of the above problems, and a flow rate switching device capable of holding not only fully opened and fully closed but also the amount of valve opening therebetween using an electromagnetic valve, and An object of the present invention is to provide a cooling system for an internal combustion engine using the above.

  In order to solve the above problems, the flow rate switching device of the present invention is a flow rate switching device that switches the flow rate of the fluid flowing in from the inflow hole to flow out of the outflow hole, and has an internal space. A case body in which the inflow hole is formed in a part of the inner side surface on the side and the outflow hole is formed in the inner side surface on the opposite side in the internal space; a first electromagnetic valve disposed in the case body; A second electromagnetic valve, wherein the first electromagnetic valve is movably housed in a first direction contacting and separating from the inner side surface of the one side in the internal space of the case body, and is opposed to the inflow hole. A first opening is formed so as to overlap the portion to be formed, and a second opening is formed in a portion not facing the inflow hole, and abuts on the inner surface on the one side to close the second opening. The inner surface of the one side A first valve body that opens by opening the second opening away from the first electromagnet, and a first electromagnet that is disposed on the inner surface on the one side of the case body and that opens and closes the first valve body And the second solenoid valve is movably accommodated in a second direction contacting and separating from the first valve body between the first valve body and the inner surface on the opposite side of the case body. The first opening can be closed and formed smaller than the first valve body, and the first opening is closed by contacting the first valve body and closing the first opening. A second valve body that opens by opening the first opening away from the second electromagnet, and a second electromagnet that is disposed on the inner surface on the one side of the case body and that opens and closes the second valve body Are provided.

  According to the above configuration, the second opening is opened / closed by opening / closing the first electromagnetic valve, and the first opening is opened / closed by opening / closing the second electromagnetic valve. As a result, when both the first solenoid valve and the second solenoid valve are closed (that is, when the flow rate switching device is fully closed), both the inflow of fluid from the inflow hole and the outflow of fluid from the outflow hole are performed. It can be stopped.

  Further, when both the first solenoid valve and the second solenoid valve are opened (that is, when the flow rate switching device is fully opened), the fluid flowing in from the inflow hole passes through the first opening or the second opening. And flows out from the outflow hole.

  In addition, when the first solenoid valve is closed and the second solenoid valve is opened (that is, in the half-open state of the flow rate switching device), the fluid flowing in from the inflow hole passes only through the first opening. It flows out from the outflow hole. In this case, the outflow amount from the outflow hole is smaller than when both the first electromagnetic valve and the second electromagnetic valve are opened.

  Thus, in the half-open state of the flow rate switching device, the outflow amount from the outflow hole can be reduced compared to the fully open state of the flow rate switching device. That is, it is possible to realize a flow rate switching device that can hold not only fully open and fully closed but also half open (the amount of valve opening therebetween) using an electromagnetic valve that can only be fully opened or fully closed.

  Further, the flow rate switching device of the present invention is the flow rate switching device described above, wherein the first electromagnet closes the first valve body when energized, and the second electromagnet is energized. This closes the second valve body.

  According to said structure, a valve body (a 1st valve body and a 2nd valve body) is closed by the electromagnetic force which generate | occur | produces in an electromagnet by electricity supply of an electromagnet (a 1st electromagnet and a 2nd electromagnet). Further, by de-energizing the electromagnet, the valve element is opened using the inflow pressure of the fluid flowing in from the inflow hole. Since power is supplied only when the valve is closed, power consumption can be reduced.

  Moreover, the flow rate switching device of the present invention is the flow rate switching device described above, and further includes a first spring that biases the first valve body toward the inner side surface on the one side.

  According to said structure, since the 1st spring which urges | biases a 1st valve body to the one inner surface side of a case body is provided, the inflow pressure of the fluid from an inflow hole is predetermined value (the urging | biasing force of a 1st spring) The first solenoid valve can be opened only when the value is equal to or greater than the value determined by In other words, when the inflow pressure of the fluid from the inflow hole is less than a predetermined value, the first electromagnetic valve can be closed by the biasing force of the first spring. As a result, even when the first solenoid valve is closed (for example, when a failure occurs due to disconnection of the solenoid valve coil or the like), the first solenoid valve can be closed by the biasing force of the first spring.

  The flow rate switching device according to the present invention is the flow rate switching device described above, and further includes a second spring that biases the second valve body toward the first valve body.

  According to said structure, since the 2nd spring which urges | biases a 2nd valve body to the 1st valve body side is provided, the inflow pressure of the fluid from an inflow hole is more than predetermined value (value determined by the urging | biasing force of a 2nd spring) Only in this case, the second electromagnetic valve can be opened. In other words, when the inflow pressure of the fluid from the inflow hole is less than a predetermined value, the second electromagnetic valve can be closed by the urging force of the second spring. As a result, even when the second solenoid valve is closed (for example, a failure due to disconnection of the solenoid valve coil or the like), the second solenoid valve can be closed by the biasing force of the second spring.

  The flow rate switching device of the present invention is the flow rate switching device described above, wherein the first valve body regulates a movable range of the second valve body on the first main surface on the opposite side. A plurality of first claw portions, each of the first claw portions is erected around the first opening so as to surround the second valve body, and the movable range of the second valve body A base portion that is restricted in the second direction, and a locking portion that is formed so as to protrude inwardly in the base portion and restricts the movable range of the second valve body in the second direction.

  According to said structure, a 1st valve body has a some 1st nail | claw part which controls the movable range of a 2nd valve body in the 1st main surface of the other side (opposite side with respect to one side of internal space). Since it has, it can prevent that a 2nd valve body moves to a place outside predetermined, and, thereby, can open and close the 1st opening part by a 2nd valve body appropriately.

  In particular, each first claw portion has a base portion that stands up around the first opening so as to surround the second valve body and restricts the movable range of the second valve body in the second direction. By the base, the second valve body can be moved only in the second direction without coming off from the first opening.

  Further, each first claw portion is formed so as to protrude inward at the base portion, and has a locking portion that restricts the movable range of the second valve body in the second direction. The movable range of the two-valve body in the second direction can be set as appropriate, and the flow rate of the fluid flowing through the first opening to the outflow hole can be set to a desired flow rate.

  Further, the flow rate switching device of the present invention is the flow rate switching device described above, wherein the second valve body is formed to be fitted inside the first opening, and the second valve body A second claw portion that engages with the first main surface of the first valve body is formed on the second main surface on the opposite side.

  According to said structure, since a 2nd valve body is formed so that a fitting is possible inside a 1st opening part, when a 2nd valve body fits inside a 1st opening part, a 2nd valve The first opening can be completely occluded by the body.

  In addition, since the second claw portion that engages with the first main surface of the first valve body is formed on the second main surface on the opposite side of the second valve body (opposite side of the inner space), It is possible to prevent the second valve body from dropping from the first opening to the one side of the internal space.

  The flow rate switching device according to the present invention is the flow rate switching device described above, wherein the first valve body is formed of a magnetic body, and the first electromagnet cooperates with the first valve body. A first magnetic path is formed, and a first facing surface facing the first valve body is disposed on the inner side surface on the one side so that a part of the inner side surface on the one side of the case body is formed. And a first coil that generates a magnetic flux passing through the first magnetic path when energized.

  According to the above configuration, when the magnetic flux passing through the first magnetic path is generated by energization of the first coil, the first valve body and the first magnetic path member are magnetized by the magnetic flux, and the magnetic force generated between them is magnetized. The first valve body is attracted to the first magnetic path member by the attractive force, and the first electromagnetic valve is closed. On the other hand, when the first coil is de-energized, the magnetic flux in the first magnetic path disappears, the magnetic attractive force between the first valve body and the first magnetic path member disappears, and the inflow pressure of the fluid flowing in from the inflow hole As a result, the first valve body is separated from the first magnetic path member, and the first electromagnetic valve is opened.

  With this simple configuration, the first electromagnet that closes / opens the first valve body by energization / non-energization can be configured.

  The flow rate switching device according to the present invention is the flow rate switching device described above, wherein the first magnetic path member is formed in an annular shape so as to surround the inflow hole, and the first opposing surface has the first flow rate switching device. A first coil storage recess is provided along the circumferential direction of the opposing surface, and the first coil is stored in the first coil storage recess.

  According to said structure, a 1st magnetic path member is cyclically | annularly formed so that the inflow hole into which a refrigerant | coolant may flow may be enclosed, and in the circumferential direction of a 1st opposing surface in the 1st opposing surface facing the 1st valve body. Since the first coil storage recess is provided and the first coil is stored in the first coil storage recess, the first magnetic path member and the first coil are compactly arranged on the inner surface on one side of the case body. Can be set.

  The flow rate switching device of the present invention is the flow rate switching device described above, wherein the second valve body is formed of a magnetic body, and the second electromagnet cooperates with the second valve body. A second magnetic path is formed, and a second facing surface facing the second valve body is disposed on the inner side surface on the one side so that a part of the inner side surface on the one side of the case body is formed. And a second coil that generates a magnetic flux passing through the second magnetic path when energized.

  According to the above configuration, when the magnetic flux passing through the second magnetic path is generated by energization of the second coil, the second valve body and the second magnetic path member are magnetized by the magnetic flux, and the magnetic force generated therebetween The second valve body is attracted to the second magnetic path member side (that is, the first valve body side) by the attractive force, and the second electromagnetic valve is closed. On the other hand, when the second coil is de-energized, the magnetic flux in the second magnetic path disappears, the magnetic attractive force between the second valve element and the second magnetic path member disappears, and the inflow pressure of the fluid flowing in from the inflow hole As a result, the second valve body is separated from the first valve body, and the second electromagnetic valve is opened.

  With this simple configuration, the second electromagnet that closes / opens the second valve body by energization / non-energization can be configured.

  The flow rate switching device according to the present invention is the flow rate switching device described above, wherein the second electromagnet is formed in an annular shape so as to surround the inflow hole, and the second facing surface is the second facing surface. A second coil storage recess is provided in the circumferential direction of the first coil, and the second coil is stored in the second coil storage recess.

  According to said structure, a 2nd magnetic path member is cyclically | annularly formed so that the inflow hole into which a refrigerant | coolant may flow may be enclosed, and in the circumferential direction of a 2nd opposing surface in the 2nd opposing surface facing the 2nd valve body. Since the second coil storage recess is provided and the second coil is stored in the second coil storage recess, the second magnetic path member and the second coil are compactly arranged on the inner surface on one side of the case body. Can be set.

  The flow rate switching device of the present invention is the flow rate switching device described above, and when the flow rate switching device is in a fully closed state, the first electromagnetic valve and the second electromagnetic valve are both closed, In the fully open state of the switching device, both the first solenoid valve and the second solenoid valve are opened. In the half open state of the flow rate switching device, the first solenoid valve is closed and the second solenoid valve is opened. It is what is said.

  According to said structure, the valve opening amount of the said flow volume switching apparatus can be switched to three steps, a full-closed state, a full-open state, and a half-open state by the combination of the open / close state of a 1st solenoid valve and a 2nd solenoid valve. .

  Further, the flow rate switching device according to the present invention is the flow rate switching device described above, and when the outflow of the fluid from the outflow hole is started, the second electromagnetic valve is closed and the second electromagnetic valve is closed. After the solenoid valve is opened, the first solenoid valve is opened after a lapse of a certain time with the second solenoid valve being opened.

  According to said structure, when the outflow of the fluid from an outflow hole is started, the outflow amount can be increased in steps from a small outflow amount.

  The cooling system for an internal combustion engine according to the present invention includes a radiator that cools a refrigerant flowing out from a predetermined internal combustion engine, a first circulation circuit that circulates the refrigerant between the internal combustion engine and the radiator, and the first circulation. A pump for sending the refrigerant flowing in the circuit to the internal combustion engine, and the refrigerant flowing in the first circulation circuit without any branch point on the refrigerant outflow side or the refrigerant inflow side of the internal combustion engine in the first circulation circuit. The flow rate switching device described above that switches a flow rate, and a control device that controls opening and closing of the first electromagnetic valve and the second electromagnetic valve of the flow rate switching device.

  According to the above configuration, since the flow rate switching device is disposed on the refrigerant outflow side or the refrigerant inflow side of the internal combustion engine in the first circulation circuit without the branch point, the electromagnetic flow that switches the flow rate of the refrigerant flowing through the internal combustion engine. Acts as a valve. Moreover, when starting the outflow of the refrigerant from the flow rate switching device, the outflow amount is increased stepwise from a small outflow amount. Accordingly, when the refrigerant starts to flow through the internal combustion engine by switching the flow rate switching device, the flow rate of the refrigerant flowing through the internal combustion engine can be increased stepwise.

  As a result, when the refrigerant starts to flow through the internal combustion engine, it is possible to prevent the flow rate of the refrigerant flowing through the internal combustion engine from rapidly increasing, thereby preventing the temperature of the refrigerant flowing through the internal combustion engine from rapidly decreasing. As a result, even if the refrigerant starts to flow out of the flow rate switching device during, for example, warm-up operation of the internal combustion engine, the temperature of the cooling water flowing to the internal combustion engine does not rapidly decrease, thereby preventing the improvement in fuel efficiency of the internal combustion engine from decreasing. it can.

  The cooling system for an internal combustion engine according to the present invention is the cooling system for an internal combustion engine described above, wherein the heater core performs heating using the refrigerant flowing out of the internal combustion engine, and the radiator in the first circulation circuit. A first branch point disposed in front of the refrigerant inflow side and a second branch point disposed in the first circulation circuit after the refrigerant outflow side of the radiator are connected via the heater core. And a second circulation circuit that circulates the refrigerant flowing out of the internal combustion engine through the heater core and returns the refrigerant to the internal combustion engine.

  According to the above configuration, since the flow rate switching device is disposed on the refrigerant outflow side or the refrigerant inflow side of the internal combustion engine in the first circulation circuit without the branch point, the electromagnetic flow that switches the flow rate of the refrigerant flowing through the internal combustion engine. Acts as a valve. Therefore, even when the heater core is provided as in the above configuration, the flow rate of the refrigerant flowing through the internal combustion engine can be increased stepwise when the refrigerant starts to flow through the internal combustion engine by switching the flow rate switching device.

  The cooling system for an internal combustion engine of the present invention includes a radiator that cools a refrigerant flowing out of a predetermined internal combustion engine, a first circulation circuit that circulates the refrigerant between the internal combustion engine and the radiator, and the internal combustion engine. A heater core that performs heating using the flowing refrigerant, a first branch point disposed in front of the refrigerant inflow side of the radiator in the first circulation circuit, and a refrigerant outflow side of the radiator in the first circulation circuit A second circulation circuit connected to the second branch point disposed after the heater core, circulating the refrigerant flowing out of the internal combustion engine to the heater core and returning the refrigerant to the internal combustion engine, A pump for sending the refrigerant from the second branch point to the internal combustion engine, and the refrigerant inflow side or the refrigerant outflow side of the heater core in the second circulation circuit are arranged without a branch point. The flow rate switching device described above that switches the flow rate of the refrigerant flowing in the second circulation circuit, and a control device that controls opening and closing of the first electromagnetic valve and the second electromagnetic valve of the flow rate switching device. is there.

  According to the above configuration, the flow rate switching device is disposed on the refrigerant inflow side or the refrigerant outflow side of the heater core in the second circulation circuit without a branch point, so that the electromagnetic flow for switching the flow rate of the refrigerant flowing in the heater core. Acts as a valve. Moreover, when starting the outflow of the refrigerant from the flow rate switching device, the outflow amount is increased stepwise from a small outflow amount. Accordingly, when the refrigerant starts to flow through the heater core by opening / closing switching of the flow rate switching device, the flow rate of the refrigerant flowing through the heater core can be increased stepwise.

  As a result, when the refrigerant starts to flow through the heater core, it is possible to prevent the flow rate of the refrigerant flowing through the heater core from rapidly increasing, thereby preventing the temperature of the refrigerant flowing through the heater core from rapidly increasing (that is, the heater core). It is possible to prevent the air temperature at the blowout part from rising rapidly).

  In the flow rate switching device and the cooling system for an internal combustion engine according to the present invention, not only fully open and fully closed but also the valve opening amount between them can be maintained by using the electromagnetic valve.

It is a section schematic diagram of a side view of a flow rate change device concerning a 1st embodiment of the present invention. It is a top view of the 1st valve body and the 2nd valve body seen from the arrow direction Y2 of FIG. It is the cross-sectional schematic of the side view which showed the fully closed state of the flow volume switching apparatus of FIG. It is the cross-sectional schematic of the side view which showed the full open state of the flow volume switching apparatus of FIG. It is the cross-sectional schematic of the side view which showed the half-open state of the flow volume switching apparatus of FIG. FIG. 5 is a schematic configuration diagram of a cooling system for an internal combustion engine according to a second embodiment of the present invention. FIG. 7 is a diagram showing changes in the coolant temperature inside and outside the internal combustion engine when the flow rate switching device is opened and closed in the cooling system of FIG. 6. It is a structure schematic of the cooling system of the internal combustion engine which concerns on 3rd Embodiment of this invention. It is the cross-sectional schematic of the conventional solenoid valve seen from the side. For example, in the cooling system of Patent Document 2, it is a diagram showing changes in the cooling water temperature inside and outside the internal combustion engine when the solenoid valve is opened and closed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<< First Embodiment >>
<Overall configuration>
FIG. 1 is a schematic cross-sectional view of the flow rate switching device according to the first embodiment of the present invention in a side view, and FIG. 2 shows the first valve body and the second valve body viewed from the arrow direction Y2 in FIG. It is a top view.

  This flow rate switching device can be used to switch the flow rate of cooling water (fluid, refrigerant) circulating in a cooling system of an internal combustion engine such as a vehicle engine, for example. This flow rate switching device is configured so as to be able to hold not only the fully open and fully closed state but also the valve opening amount therebetween using an electromagnetic valve.

  As shown in FIG. 1, the flow rate switching device 1 has a case where the case body 3, the first electromagnetic valve 5, the second electromagnetic valve 7, and the first electromagnetic valve 5 are closed (failure that prevents the valve from being closed). A first spring 9 for countermeasure and a second spring 11 for countermeasure against closing failure of the second electromagnetic valve 7 are provided.

<Configuration of case body 3>
The case body 3 has, for example, a cylindrical internal space 3a. An inflow hole 3c for fluid inflow communicating with the external space is formed in a part (for example, a central portion) of the bottom surface (one inner side surface) 3b of the internal space 3a. In addition, a fluid outflow hole 3e communicating with the external space is formed on the ceiling surface (inner side surface on the opposite side) 3d of the internal space 3a.

  In this embodiment, as will be described later, the bottom surface 3b includes a surface (first facing surface) 5p on the ceiling surface 3d side of the first magnetic path member 5i and a ceiling surface 3d side of the second magnetic path member 7i. And a surface (second opposing surface) 7p.

<Configuration of first solenoid valve 5>
As shown in FIGS. 1 and 2, the first electromagnetic valve 5 includes a first valve body 5a and a first electromagnet 5h that drives the first valve body 5a to open and close.

  The first valve body 5a is formed of a magnetic material. The first valve body 5a is formed in a plate shape (here, a disk shape) that is substantially the same shape and size as the bottom surface 3b of the case body 3, and in the internal space 3a of the case body 3, faces the bottom surface 3b. Thus, it is movably stored in a direction (first direction) P1 that is in contact with and away from the bottom surface 3b.

  In the first valve body 5a, a first opening 5b is formed so as to overlap a portion (for example, a central portion) facing the inflow hole 3c, and a second portion is formed in a portion (for example, a peripheral portion) not facing the inflow hole 3c. An opening 5c is formed. Here, as shown in FIG. 2, the first opening 5b is formed in a circular shape larger than the inflow hole 3c, and only one is formed in the central portion of the first valve body 5a. In addition, a plurality of second openings 5c are formed at equal intervals in the circumferential direction at the peripheral portion of the first valve body 5a.

  In addition, the first valve body 5a is a plurality of which regulates the movable range of the second valve body 7a (described later) of the second electromagnetic valve 7 on the main surface (first main surface) 5d on the ceiling surface 3d side (opposite side). The first claw portion 5e is provided. Each first claw portion 5e has a base portion 5f provided upright around the first opening portion 5b, and a locking portion 5g formed so as to protrude inwardly at the distal end portion of the base portion 5f. As will be described later, the second valve body 7a of the second electromagnetic valve 7 is disposed inside each of the first claw portions 5e.

  The first claw portion 5e can prevent the second valve body 7a from moving to a place outside the predetermined range, thereby appropriately opening and closing the first opening 5b by the second valve body 7a, as will be described later. Can be done. In particular, the second valve body 7a can be moved only in the direction (second direction) P1 in contact with and away from the first valve body 5a without detaching from the first opening 5b by the base portion 5f of each first claw portion 5e. Can be made. In addition, the movable range of the second valve body 7a in the second direction P1 can be set to an appropriate range by the locking portions 5g of the first claw portions 5e, so that the inflow hole 3c flows in as described later. Thus, the flow rate of the fluid flowing through the first opening 5b to the outflow hole 3e can be set to a desired flow rate.

  The first valve body 5a is movable toward the bottom surface 3b side of the case body 3 until the main surface 5n on the bottom surface 3b side contacts the bottom surface 3b, while on the other hand, toward the ceiling surface 3d side of the case body 3 The first claw portion 5e is movable until the upper end surface 5m contacts the ceiling surface 3d. The first valve body 5a contacts the bottom surface 3b of the case body 3 to close the second opening 5c, thereby closing the valve and opening the second opening 5c away from the bottom surface 3b of the case body 3. To open the valve. The closing of the first valve body 5a means closing of the first electromagnetic valve 5, and the opening of the first valve body 5a means opening of the first electromagnetic valve 5.

  The first electromagnet 5h is disposed on the bottom surface 3b of the case body 3, and cooperates with the first valve body 5a to form the first magnetic path member 5i that constitutes the first magnetic path, and to supply the first magnetic magnet 5h. And a first coil 5j for generating a magnetic flux B1 passing through the paths (5a and 5i).

  The first magnetic path member 5i is formed of a magnetic material. The first magnetic path member 5 i is disposed on the bottom surface 3 b such that the first facing surface 5 p facing the first valve body 5 a forms part of the bottom surface 3 b of the case body 3. Here, the first magnetic path member 5i is further formed in an annular shape having the same shape and the same size as the peripheral portion of the first valve body 5a (the portion where the second opening 5c is formed). The opposed surface 5p is formed so as to have a first coil housing recess 5k having a substantially U-shaped cross section over the circumferential direction of the first opposed surface 5p. In addition, the 1st magnetic path member 5i formed in this way is arrange | positioned by the case body 3 so that the said peripheral part of the 1st valve body 5a may be opposed.

  As will be described later, the first magnetic path member 5 i is formed integrally with a later-described second magnetic path member 7 i of the second electromagnetic valve 7.

  The first coil 5j is stored in a state wound around the first coil storage recess 5k in the first coil storage recess 5k.

  With this configuration, in the first solenoid valve 5, when the first coil 5j is energized, a magnetic flux B1 passing through the first magnetic path (5a and 5i) is generated around the first coil 5j. The first valve body 5a and the first magnetic path member 5i are magnetized by the magnetic flux B1. The first valve body 5a is attracted to the first magnetic path member 5i by the magnetic attractive force generated between the first valve body 5a and the first magnetic path member 5i by the magnetization, and the first magnetic path member 5i. (That is, abuts on the bottom surface 3b). The second opening 5c of the first valve body 5a is closed by this contact, and the first valve body 5a is closed.

  The closing of the second opening 5c means that the peripheral portion of the first valve body 5a (the portion where the second opening 5c is formed) abuts on the first magnetic path member 5i. The second opening 5c and the inflow hole 3c are spatially disconnected on the main surface 5n side of 5a.

  Here, the first magnetic path member 5i has a function of attracting the first valve body 5a to the first magnetic path member 5i (attraction function) and abuts the first valve body 5a to close the second opening 5c. It is responsible for the function (blocking function). Here, the first magnetic path member 5i is formed in an annular shape that is substantially the same shape and size as the peripheral portion of the first valve body 5a (the portion where the second opening 5c is formed) as described above. , And has the closing function (that is, when it comes into contact with the first valve body 5a, it makes contact with the peripheral portion of the first valve body 5a to close the second opening 5c). In addition, although the 1st magnetic path member 5i bears both the said attracting function and the said obstruction | occlusion function here, you may make the said obstruction | occlusion function bear with another member. The other members in this case do not need to be magnetic.

  On the other hand, when the first coil 5j is deenergized, the magnetic flux B1 in the first magnetic path (5a and 5i) is lost, and the magnetic attractive force between the first valve body 5a and the first magnetic path member 5i is lost. The first valve body 5a is released from the first magnetic path member 5i by the inflow pressure of the fluid flowing in from the inflow hole 3c, and the first valve body 5a is opened.

  Thus, since the first electromagnetic valve 5 is energized only when the valve is closed, the power consumption can be reduced.

  The first electromagnet 5h constitutes a part of the bottom surface 3b of the case body 3 and cooperates with the first valve body 5a to form a first magnetic path member 5i and the first magnet. Since the first coil 5j generates the magnetic flux B1 passing through the paths (5a and 5i), the first valve body 5a is closed / closed by energization / non-energization of the first coil 5j. The first electromagnet 5h that can be opened can be configured.

  Further, the first magnetic path member 5i is formed in an annular shape so as to surround the inflow hole 3c, has a first coil storage recess 5k on the first facing surface 5p, and the first coil storage recess 5k has a first in it. Since the coil 5j is housed, the first magnetic path member 5i and the first coil 5j can be disposed on the bottom surface 3c of the case body 3 in a compact manner.

<Configuration of second solenoid valve 7>
As shown in FIGS. 1 and 2, the second electromagnetic valve 7 includes a second valve body 7a and a second electromagnet 7h that opens and closes the second valve body 7a.

  The second valve body 7a is formed of a magnetic material. The second valve body 7 a is formed in a plate shape that can close the first opening 5 b of the first valve body 5 and has a smaller size than the first valve body 5. Here, the second valve body 7a has, for example, a shape that can be fitted inside the first opening 5b of the first valve body 5a (ie, a plate shape that is substantially the same shape and size as the first opening 5b). It is formed. Thereby, the 1st opening part 5b can be completely obstruct | occluded by the 2nd valve body 7a.

  The second valve body 7a is in a posture facing the first valve body 5a between the first valve body 5 and the ceiling surface 5d of the case body 3 in a direction in which the second valve body 7a is in contact with or separated from the first valve body 5 (second direction). ) It is movably stored in P1. Here, the 2nd valve body 7a is accommodated inside the some 1st nail | claw part 5e of the 1st valve body 5a (Namely, it arrange | positions in the state enclosed by the some 1st nail | claw part 5e).

  Further, the main surface (second main surface) 7d on the ceiling surface 3d side (opposite side) 7d of the second valve body 7a is, for example, the main surface of the first valve body 5a so as to protrude to the outer peripheral side at the periphery. A plurality of second claw portions 7e that engage with 5d are formed. The second claw portion 7e prevents the second valve body 7a from dropping from the first opening 5b toward the bottom surface 3b.

  The second valve body 7a is movable to the first valve body 5a side until the second claw portion 7e comes into contact with the main surface 5d of the first valve body 5a, and to the ceiling surface 3d side of the case body 3 The main surface 7d of the second valve body 7a is movable until it comes into contact with the locking portion 5m of the first valve body 5e. And the 2nd valve body 7a is valve-closed by fitting to the 1st opening part 5b of the 1st valve body 5a, and obstruct | occluding the 1st opening part 5b, It leaves | separates from the 1st valve body 5a, and is 1st. The valve is opened by opening the opening 5b. The closing of the second valve body 7a means closing of the second electromagnetic valve 7, and the opening of the second valve body 7a means opening of the second electromagnetic valve 7.

  The second electromagnet 7h is disposed on the bottom surface 3b of the case body 3. The second electromagnet 7h cooperates with the second valve body 7a to form a second magnetic path, and the second magnetic magnet 7h is energized. And a second coil 7j for generating a magnetic flux B2 passing through the paths (7a and 7i).

  The second magnetic path member 7i is formed of a magnetic material. The second magnetic path member 7 i is disposed on the bottom surface 3 b such that the second facing surface 7 p facing the second valve body 7 a constitutes a part of the bottom surface 3 b of the case body 3. Here, the second magnetic path member 7i is further formed in an annular shape that is substantially the same shape and size as the peripheral portion of the second valve body 7a (the portion that does not face the inflow hole 3c), and on the second facing surface 7p. The second coil housing recess 7k having a substantially U-shaped cross section is formed along the circumferential direction of the second facing surface 7p. In addition, the 2nd magnetic path member 7i formed in this way is arrange | positioned by the case body 3 so that it may arrange | position inside the 1st magnetic path member 5i.

  Here, the second magnetic path member 7i is integrally formed with the outer peripheral wall portion 7ia and the inner peripheral wall portion 5ia of the first magnetic path member 5i.

  The second coil 7j is stored in a state wound around the second coil storage recess 7k in the second coil storage recess 7k.

  With this configuration, when the second coil 7j is energized in the second solenoid valve 7, a magnetic flux B2 passing through the second magnetic path (7a and 7i) is generated around the second coil 7j. The second valve body 7a and the second magnetic path member 7j are magnetized by the magnetic flux B2. The second valve body 7a is moved toward the second magnetic path member 7j (that is, the first valve body 5a) by the magnetic attraction force generated between the second valve body 7a and the second magnetic path member 7j by the magnetization. The first opening 5b of the first valve body 5a is closed by being attracted. And the 2nd valve body 7a is closed by this obstruction | occlusion.

  On the other hand, when the second coil 7a is deenergized, the magnetic flux B2 in the second magnetic path (7a and 7i) is lost, and the magnetic attractive force between the second valve element 7a and the second magnetic path member 7j is lost. The second valve body 7a is separated from the first valve body 5a toward the ceiling surface 3d by the inflow pressure of the fluid flowing in from the inflow hole 3c, and the second valve body 7a is opened.

  Thus, since the second electromagnetic valve 7 is energized only when the valve is closed, power consumption can be reduced.

  The second electromagnet 7h constitutes a part of the bottom surface 3b of the case body 3 and cooperates with the second valve body 7a to form a second magnetic path member 7i and the second magnetic path member 7i. Since the first coil 5j that generates the magnetic flux B2 passing through the path (7a and 7i) is configured, the second valve body 7a is closed / closed by energization / non-energization of the first coil 5j with a simple configuration. A second electromagnet 7h that can be opened can be configured.

  Further, the second magnetic path member 7i is formed in an annular shape so as to surround the inflow hole 3c, and has a second coil housing recess 7k on the second facing surface 7p, and the second coil housing recess 7k has a second inside. Since the coil 7j is housed, the second magnetic path member 7i and the second coil 7j can be compactly disposed on the bottom surface 3b of the case body 3.

<Configuration of the first spring 9 and the second spring 11>
The first spring 9 biases the first valve body 5a toward the bottom surface 3b. As shown in FIG. 1, the first spring 9 is a wound spring having a diameter L3 that is smaller than the diameter L1 of the first valve body 5a and larger than the diameter L2 of the first opening b. The first spring 9 is housed between the first valve body 5 a and the ceiling surface 3 d of the case body 3.

  With the first spring 9, the first electromagnetic valve 5 can be opened only when the inflow pressure of the fluid from the inflow hole 3c is equal to or higher than a predetermined value (a value determined by the urging force of the first spring 9). In other words, when the inflow pressure of the fluid from the inflow hole 3 c is less than a predetermined value, the first electromagnetic valve 5 can be autonomously closed by the urging force of the first spring 9. Thus, even when the first electromagnetic valve 5 is closed (for example, when the first coil 5j is broken), the first electromagnetic valve 5 can be closed by the biasing force of the first spring 9.

  The second spring 11 biases the second valve body 7a toward the first valve body 5a. As shown in FIG. 1, the second spring 11 is a winding spring having a diameter L4 that is smaller than the diameter L5 of the second valve body 7a and larger than the diameter L6 of the outflow hole 3e. The second spring 11 is housed between the second valve body 7 a and the ceiling surface 3 d of the case body 3.

  With this second spring 11, the second electromagnetic valve 7 can be opened only when the inflow pressure of the fluid from the inflow hole 3c is equal to or greater than a predetermined value (a value determined by the urging force of the second spring 11). In other words, when the inflow pressure of the fluid from the inflow hole 3 c is less than a predetermined value, the second electromagnetic valve 7 can be autonomously closed by the urging force of the second spring 11. Thus, even when the second electromagnetic valve 7 is closed (for example, a failure due to disconnection of the second coil 7j, etc.), the second electromagnetic valve 7 can be closed by the urging force of the second spring 11.

<Description of Operation of Flow Rate Switching Device 1>
3 is a schematic cross-sectional view in side view showing the fully closed state of the flow rate switching device 1, FIG. 4 is a schematic cross-sectional view in side view showing the fully open state of the flow rate switching device 1, and FIG. 2 is a schematic cross-sectional view in side view showing a half-open state of the flow rate switching device 1. FIG.

(Operation when fully closed)
When the flow rate switching device 1 is fully closed, both the first electromagnetic valve 5 and the second electromagnetic valve 7 are closed as shown in FIG. That is, by energizing the first coil 5j, a magnetic flux B1 passing through the first magnetic path (5a and 5i) is generated, and as a result, the first electromagnetic valve 5 is closed (that is, as described above). The second opening 5c is closed). At the same time, by energizing the second coil 7j, a magnetic flux B2 passing through the second magnetic path (7a and 7i) is generated, and the second electromagnetic valve 7 is closed as described above ( That is, the first opening 5b is closed). In FIG. 3, the magnetic fluxes B1 and B2 are connected to each other to form one closed magnetic flux.

  In this case, since both the first opening 5b and the second opening 5c are closed, the inflow of fluid from the inflow hole 3c and the outflow of fluid from the outflow hole 3e are stopped.

(Operation when fully open)
When fully opening the flow volume switching apparatus 1, both the 1st solenoid valve 5 and the 2nd solenoid valve 7 are opened as shown in FIG. That is, by deenergizing the first coil 5j, the magnetic flux B1 in the first magnetic path (5a and 5i) is eliminated, thereby opening the first electromagnetic valve 5 as described above (ie, The second opening 5c is opened). At the same time, the second coil 7j is deenergized to eliminate the magnetic flux B2 in the second magnetic path (7a and 7i), thereby opening the second electromagnetic valve 7 as described above. (That is, the first opening 5b is opened).

  In this case, both the first opening 5b and the second opening 5c are opened. Therefore, the fluid flowing in from the inflow hole 3c passes through the first opening 5b, further passes between the first valve body 5a and the second valve body 7a, and further passes through the second valve body 7a as indicated by an arrow R1. And the ceiling surface 3d to flow into the outflow hole 3e, and through the second opening 5c and further between the second valve body 7a and the ceiling surface 3d as shown by the arrow R2. It flows to the hole 3e.

  In this case, since two types of flow paths R1 and R2 are formed, the flow rate of the fluid flowing in from the inflow hole 3c and the outflow amount of the fluid flowing out of the outflow hole 3e will be described later (operation when half-opened). More than in the case of.

(Operation when half open)
When the flow rate switching device 1 is opened halfway, the first electromagnetic valve 5 is closed and the second electromagnetic valve 7 is opened as shown in FIG. That is, by energizing the first coil 5j, a magnetic flux B1 passing through the first magnetic path (5a and 5i) is generated, and as a result, the first electromagnetic valve 5 is closed (that is, as described above). The second opening 5c is closed). At the same time, the second coil 7j is deenergized to eliminate the magnetic flux B2 in the second magnetic path (7a and 7i), thereby opening the second electromagnetic valve 7 as described above. (That is, the first opening 5b is opened).

  In this case, the first opening 5b is opened and the second opening 5c is closed. Therefore, the fluid flowing in from the inflow hole 3c passes through the first opening 5b and further passes between the first valve body 5a and the second valve body 7a as indicated by the arrow R1, and further passes through the second valve body. It flows between 7a and the ceiling surface 3d to the outflow hole 3e.

  In this case, since only one type R1 flow path is formed, the flow rate of the fluid flowing in from the inflow hole 3c and the outflow amount of the fluid flowing out of the outflow hole 3e are the same as those described above (operation when fully opened). Less than the case.

<Main effects>
As described above, in this flow rate switching device 1, the valve opening amount of the flow rate switching device 1 is set to 3 in the fully closed state, the fully open state, and the half open state by the combination of the open / closed states of the first solenoid valve 5 and the second solenoid valve 7. You can switch to the stage. That is, by using the electromagnetic valves 5 and 7 that can only be fully opened or fully closed, it is possible to realize a flow rate switching device that can hold not only fully open and fully closed but also half open (the amount of valve opening therebetween).

<< Second Embodiment >>
FIG. 6 is a schematic configuration diagram of a cooling system for an internal combustion engine according to the second embodiment of the present invention.

<Description of configuration>
This cooling system for an internal combustion engine uses the flow rate switching device 1 of the first embodiment as an electromagnetic valve for switching the flow rate of cooling water (fluid, refrigerant) flowing through the internal combustion engine. As shown in FIG. 6, the internal combustion engine cooling system 50 includes an internal combustion engine 51 such as a vehicle engine, a radiator 53, a heater core 55, a radiator circulation circuit (first circulation circuit) 57, and a heater core. A circulation circuit (second circulation circuit) 59, a mechanical water pump (hereinafter referred to as a mechanical WP) (pump) 61, a temperature control valve 63, a temperature sensor 65, and a control device 67.

  The internal combustion engine 51 generates power by, for example, burning a fuel / air mixture in a combustion chamber constituted by a cylinder block 51a and a cylinder head 51b, and reciprocating a piston in the combustion chamber. is there. The internal combustion engine 51 has a cooling water inlet 51c and a cooling water outlet 51d, and the cooling water flowing in from the cooling water inlet 51c flows in order through the cylinder block 51a and the cylinder head 51b and flows out from the cooling water outlet 51d. To do.

  The mechanical WP 61 is disposed, for example, at the cooling water inlet 51 c of the internal combustion engine 51, and the cooling water sent from the radiator 53 and / or the heater core 55 (that is, the first circulation circuit 57 or / and the second circulation circuit 59). The cooling water flowing through the internal combustion engine 51 flows into the internal combustion engine 51.

  The temperature sensor 65 detects the temperature of the cooling water in the internal combustion engine 51, and is disposed, for example, inside the internal combustion engine 51 (for example, the cylinder block 51a). The temperature sensor 65 may be disposed in the vicinity of the cooling water outlet 51 d of the internal combustion engine 51 instead of being disposed inside the internal combustion engine 51.

  The radiator 53 is a heat exchanger that cools cooling water flowing out from the internal combustion engine 51.

  The radiator circulation circuit 57 circulates cooling water between the internal combustion engine 51 and the radiator 53. Here, the circulation circuit 57 for the radiator reaches the cooling water inlet 51c of the internal combustion engine 51 via the flow rate switching device 1, the radiator 53, the temperature control valve 63, and the mechanical WP 61 in order from the cooling water outlet 51d of the internal combustion engine 51. Composed.

  The heater core 55 is a heat exchanger that performs heating using the cooling water flowing out from the internal combustion engine 51.

  The heater core circulation circuit 59 circulates cooling water between the internal combustion engine 51 and the heater core 55. Here, the heater core circulation circuit 59 connects the first branch point N1 and the second branch point (location where the temperature control valve 63 is disposed) N2 in the radiator circulation circuit 57 via the heater core 55. The cooling water flowing out from the internal combustion engine 51 circulates through the heater core 55 and returns to the internal combustion engine 51.

  The first branch point N1 is disposed between the flow rate switching device 1 and the radiator 53 in the radiator circulation circuit 57 (in other words, before the coolant inflow side of the radiator 53 in the radiator circulation circuit 57). The second branch point N2 is between the radiator 53 and the internal combustion engine 51 in the radiator circulation circuit 57 (in other words, after the cooling water outflow side of the radiator 53 in the radiator circulation circuit 57) (here, the radiator). 53 and between the mechanical WP 61).

  The temperature control valve 63 is a valve that controls the temperature of the cooling water in the internal combustion engine 51 by controlling the flow rate of the cooling water flowing through the radiator 53. Here, a thermostat type three-way valve is used as the temperature control valve 63.

  The temperature control valve 63 is disposed at the second branch point N2. The temperature control valve 63 causes the cooling water from the heater core 55 to flow out to the internal combustion engine 51 without controlling the flow rate. On the other hand, the temperature control valve 63 is configured so that the cooling water from the radiator 53 has a flow rate of the cooling water in the internal combustion engine 51 in accordance with the temperature of the cooling water from the heater core 55 (that is, the cooling water circulating through the internal combustion engine 51). Then, the temperature of the engine is controlled to be a predetermined temperature, and is discharged to the internal combustion engine 51. Specifically, the temperature control valve 63 increases the flow rate of the cooling water from the radiator 53 as the temperature of the cooling water from the heater core 55 is higher (that is, the temperature of the cooling water in the internal combustion engine 51 is higher). To flow into the internal combustion engine 51.

  Here, as the temperature control valve 63, a thermostat type three-way valve (that is, a three-way valve that autonomously controls the flow rate of the cooling water from the radiator 55) is used. However, the temperature control valve 63 is not limited thereto. For example, an electric three-way valve that can control the flow rate of the cooling water from the radiator 55 under the control of the control device 67 may be used as the temperature control valve 63. In this case, the control device 67 controls the electric three-way valve based on the detection result of the temperature sensor 64.

  The control device 67 is based on the control signal from the outside (for example, each control signal corresponding to the driving operation of the driver) S1 or the detection result of the temperature sensor 65 (that is, the cooling water temperature in the internal combustion engine 51). The mechanical WP 61 and the flow rate switching device 1 are controlled.

  More specifically, the control device 67 controls the internal combustion engine 51 (for example, warm-up operation) based on an external control signal S1.

  Further, when the detection result of the temperature sensor 65 is lower than the predetermined temperature during the warm-up operation of the internal combustion engine 51, for example, the control device 67 stops the mechanical WP 61 and controls the flow rate switching device 1 to be fully closed. (That is, the first electromagnetic valve 5 and the second electromagnetic valve 7 are both controlled to be closed). Thus, the circulation of the cooling water flowing through the internal combustion engine 51, the radiator circulation circuit 57, and the heater core circulation circuit 59 is stopped.

  On the other hand, when the detection result of the temperature sensor 65 becomes a predetermined temperature or higher during the warm-up operation of the internal combustion engine 51, for example, the control device 67 starts the operation of the mechanical WP 61 to send cooling water to the internal combustion engine 51, and the flow rate. The outflow of the cooling water from the switching device 1 is started. As a result, the cooling water is circulated through the internal combustion engine 51, the radiator circulation circuit 57, and the heater core circulation circuit 59.

  More specifically, when starting the outflow of the cooling water from the flow rate switching device 1, the control device 67 switches and controls the flow rate switching device 1 from the fully closed state to the half open state (that is, the first electromagnetic valve 5 is switched). The second electromagnetic valve 7 is opened and the second electromagnetic valve 7 is opened), and after a lapse of a certain time, switching control is performed to the fully opened state (that is, both the first electromagnetic valve 5 and the second electromagnetic valve 7 are opened). Thereby, the outflow amount of the cooling water from the flow rate switching device 1 is increased stepwise.

<Description of operation>
In the cooling system 50, when the detection result of the temperature sensor 65 (that is, the cooling water temperature in the internal combustion engine 51) is lower than a predetermined temperature during operation of the internal combustion engine 51, the mechanical WP 61 is stopped and the flow rate switching device 1 is stopped. Is fully closed, and the circulation of the cooling water to the internal combustion engine 51 and the circulation of the cooling water to the heater core 55 are stopped.

  When the detection result of the temperature sensor 65 becomes equal to or higher than the predetermined temperature, the mechanical WP 61 starts to operate, and the flow rate switching device 1 is switched from the fully closed state to the half open state. . Thus, the coolant circulates in the order of the internal combustion engine 51 → the flow rate switching device 1 → the radiator 53 → the temperature control valve 63 → the internal combustion engine 51, and the internal combustion engine 51 → the flow rate switching device 1 → the heater core 55 → the temperature control valve 63. → Circulate in the order of the internal combustion engine 51. Thereby, circulation of the cooling water to the internal combustion engine 51 and circulation of the cooling water to the heater core 55 are started.

  At this time, a small amount of cooling water circulates in the internal combustion engine 51 and the heater core 55 when the flow rate switching device 1 is in a half-open state, and when the flow rate switching device 1 is fully opened, a relatively large amount (hereinafter, a normal amount). ) Is circulated (that is, the cooling water is increased stepwise). As a result, the temperature of the cooling water in the internal combustion engine 51 is prevented from rapidly decreasing and the air temperature at the outlet of the heater is prevented from rapidly increasing.

  During this time, the temperature control valve 63 circulates in the order of the internal combustion engine 51 → the flow rate switching device 1 → the radiator 53 → the temperature control valve 63 → the internal combustion engine 51 so that the temperature of the cooling water in the internal combustion engine 51 becomes a predetermined temperature. The flow rate of the cooling water is controlled.

<Relationship between Open / Close Switching of Flow Rate Switching Device 1 and Cooling Water Temperature Inside and Outside of Internal Combustion Engine 51>
FIG. 7 shows a change in the cooling water temperature Tin inside the internal combustion engine 51 when the flow rate switching device 1 is switched between opening and closing and the outside of the internal combustion engine 51 (for example, the internal combustion engine) in the internal combustion engine cooling system 50 according to the second embodiment. It is the figure which showed the change of the temperature Tout of the cooling water of 51 cooling water outlet 51d vicinity). A temperature T2 in FIG. 7 indicates the temperature T2 in FIG. In addition, the vertical axis | shaft of FIG. 7 is the temperature of a cooling water, and a horizontal axis is time.

  In FIG. 7, during the operation of the internal combustion engine 51 (for example, during warm-up operation), the flow rate switching device 1 switches from the fully closed state to the half open state at time t1, and the flow rate switching device 1 changes from the half open state to the fully open state at time t2. Switch. When the time t is t0 << t <t1, the flow rate switching device 1 is in the fully closed state, so that the cooling water does not circulate in the internal combustion engine 51. Therefore, the temperature Tin of the cooling water inside the internal combustion engine 51 (cooling water accumulated inside) rises, and the temperature Tout of the cooling water outside the internal combustion engine 51 remains at the low temperature T3.

  When the flow rate switching device 1 is switched from the fully closed state to the half open state at time t = t1, the cooling water circulates in the internal combustion engine 51 in accordance with the flow rate of the cooling water flowing through the flow rate switching device 1. In this state (the half-open state of the flow rate switching device 1), since the flow rate of the cooling water flowing through the flow rate switching device 1 is small, a small amount of cooling water also flows through the internal combustion engine 51. Thereby, when the time t is t1 <t <t2, the temperature Tin of the cooling water inside the internal combustion engine 51 gradually decreases from T1 to T4 (> T2), and the cooling water in the internal combustion engine 51 flows out to the outside. As a result, the temperature Tout of the external cooling water rises.

  When the flow rate switching device 1 is switched from the half-open state to the full-open state at time t2 after a lapse of a certain time from time t1, the flow rate of the cooling water flowing through the internal combustion engine 51 increases to a normal flow rate at time t> t2. To do. And each temperature Tin and out will be in an equilibrium state, and will become the same temperature.

<Main effects of cooling system 50>
In this embodiment, since the flow rate switching device 1 of the first embodiment is used as an electromagnetic valve for switching the flow rate of the cooling water flowing to the internal combustion engine 51, the cooling water starts to flow through the internal combustion engine 51 by switching the flow rate switching device 1. Sometimes, the flow rate of the cooling water flowing through the internal combustion engine 51 can be increased stepwise.

  As a result, when the cooling water starts to flow through the internal combustion engine 51, it is possible to prevent the flow rate of the cooling water flowing through the internal combustion engine 51 from rapidly increasing, and thus the temperature of the cooling water flowing through the internal combustion engine 51 can be rapidly decreased. Can be prevented.

  Thereby, for example, even when the cooling water starts to flow out of the flow rate switching device 1 during the warm-up operation, the temperature of the cooling water flowing to the internal combustion engine 51 does not rapidly decrease, so that the improvement in fuel consumption of the internal combustion engine 51 is reduced. Can be prevented.

<Modification of Second Embodiment>
In the second embodiment, the flow rate switching device 1 is disposed on the cooling water outflow side of the internal combustion engine 51 in the radiator circulation circuit 57 without a branch point, but instead, in the radiator circulation circuit 57. It may be arranged on the cooling water inflow side of the internal combustion engine 51 without a branch point (for example, it may be arranged between the temperature control valve 63 and the mechanical WP 61).

  Further, in the second embodiment, the case where the heater core 55 is provided has been described. However, the heater core 55 (therefore, the heater core circulation circuit 57, the first branch point N1, and the second branch point N2) may be omitted. I do not care.

«Third embodiment»
FIG. 8 is a schematic configuration diagram of a cooling system for an internal combustion engine according to the third embodiment.

<Description of configuration>
In the second embodiment, the flow rate switching device 1 is used as an electromagnetic valve that switches the flow rate of the cooling water flowing to the internal combustion engine 51. However, in this embodiment, the flow rate switching device 1 is used to cool the cooling water flowing to the heater core 55. Used as an electromagnetic valve for switching the flow rate.

  In the following description, the same components as those in the second embodiment are denoted by the same reference numerals, description thereof is omitted, and differences from the second embodiment will be mainly described.

  In the cooling system 50B of this embodiment, the flow rate switching device 1 is disposed between the first branch point N1 and the heater core 55 in the heater core circulation circuit 59, as shown in FIG. In other words, the radiator circulation circuit 59 is disposed on the cooling water inflow side of the heater core 55 without a branch point.

  The control device 67B of the cooling system 50B is based on the detection result of the temperature sensor 65 and an external control signal (for example, each control number S1 corresponding to the driving operation of the driver and each control signal S2 corresponding to the heater operation). The internal combustion engine 51, the mechanical WP61, and the flow rate switching device 1 are controlled.

  The control device 67B controls the internal combustion engine 51 and the mechanical WP 61 in the same manner as the control device 67 of the second embodiment.

  Further, when the control device 67B receives the heater stop signal S2 from the outside, the control device 67B switches to the fully closed state. On the other hand, when the control device 67B receives the heater start signal S2 from the outside, the control device 67B Start cooling water outflow.

  More specifically, the control device 67B controls the switching of the flow rate switching device 1 from the fully closed state to the half open state in the same manner as in the second embodiment when starting the cooling water outflow from the flow rate switching device 1. Then, after a certain period of time, the control is switched to the fully open state. Thereby, the outflow amount of the cooling water from the flow rate switching device 1 is increased stepwise, and the flow rate of the cooling water flowing through the heater core 55 is increased stepwise.

<Main effects of cooling system 50B>
In this embodiment, since the flow rate switching device 1 of the first embodiment is used as an electromagnetic valve for switching the flow rate of the cooling water flowing through the heater core 55, the cooling water starts to flow through the heater core 55 by switching the flow rate switching device 1. Sometimes, the flow rate of the cooling water flowing through the heater core 55 can be increased stepwise.

  Thereby, when the cooling water starts to flow through the heater core 55, the flow rate of the cooling water flowing through the heater core 55 can be prevented from rapidly increasing, and the temperature of the cooling water flowing through the heater core 55 can be prevented from rapidly increasing (that is, the heater core 55). It is possible to prevent the air temperature at the blowout part from rising rapidly).

<Modification of Third Embodiment>
In the third embodiment, the flow rate switching device 1 is arranged on the cooling water inflow side of the heater core 55 in the heater core circulation circuit 59 without a branch point. Instead, the heater core circulation circuit is arranged. 59 may be disposed on the cooling water outflow side of the heater core 55 at 59 without a branch point (for example, may be disposed between the temperature control valve 63 and the heater core 55).

≪Attached matters≫
As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to such an example. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. It is understood.

  Moreover, it is understood that the invention combining any one of the first to third embodiments belongs to the technical scope of the present invention.

  The flow rate switching device according to the present invention is suitable for use as an electromagnetic valve for switching the flow rate of cooling water circulating in a cooling system of an internal combustion engine such as a vehicle engine.

DESCRIPTION OF SYMBOLS 1 Flow volume switching apparatus 3 Case body 3a Internal space 3b Bottom face (inner side surface of one side)
3c Inflow hole 3d Ceiling surface (opposite inner surface)
3e Outflow hole 5 1st solenoid valve 5a 1st valve body 5b 1st opening part 5c 2nd opening part 5d Main surface (1st main surface)
5e 1st nail | claw part 5f Base part 5g Locking part 5h 1st electromagnet 5i 1st magnetic path member 5j 1st coil 5k 1st coil storage recessed part 5p 1st opposing surface 7 2nd solenoid valve 7a 2nd valve body 7d Main surface ( Second main surface)
7e 2nd claw part 7h 2nd electromagnet 7i 2nd magnetic path member 7j 2nd coil 7k 2nd coil accommodating recessed part 7p 2nd opposing surface 9 1st spring 11 2nd spring 50, 50B Cooling system 51 Internal combustion engine 53 Radiator 55 Heater Core 67, 67B Controller N1 First branch point N2 Second branch point

Claims (15)

A flow rate switching device that switches the flow rate of the fluid flowing in from the inflow hole to flow out of the outflow hole,
A case body having an internal space, wherein the inflow hole is formed in a part of the inner side surface on one side in the internal space and the outflow hole is formed on the inner side surface on the opposite side in the internal space;
A first solenoid valve and a second solenoid valve disposed in the case body;
With
The first solenoid valve is
A first opening is formed in the internal space of the case body so as to be movable in a first direction that contacts and separates from the inner surface on the one side, and overlaps with a portion facing the inflow hole. A second opening is formed in a portion not facing the inflow hole, and closes by closing the second opening by contacting the inner surface on the one side and away from the inner surface on the one side. A first valve body that opens by opening the second opening;
A first electromagnet disposed on the inner surface on the one side of the case body and driving the first valve body to open and close;
With
The second solenoid valve is
Between the first valve body and the inner surface on the opposite side of the case body is housed movably in a second direction contacting and separating from the first valve body, and the first opening can be closed and The first valve body is formed smaller than the first valve body, closes by closing the first opening by contacting the first valve body, and opens the first opening away from the first valve body. A second valve body that opens at
A second electromagnet disposed on the inner surface on the one side of the case body and driving to open and close the second valve body;
A flow rate switching device comprising: The flow rate switching device according to claim 1,
The first electromagnet closes the first valve body when energized,
The flow rate switching device, wherein the second electromagnet closes the second valve body when energized. The flow rate switching device according to claim 1 or 2,
A flow rate switching device, further comprising: a first spring that biases the first valve body toward the inner surface side on the one side. The flow rate switching device according to any one of claims 1 to 3,
The flow rate switching device further comprising a second spring that biases the second valve body toward the first valve body. The flow rate switching device according to any one of claims 1 to 4,
The first valve body has a plurality of first claw portions that regulate a movable range of the second valve body on the first main surface on the opposite side,
Each of the first claws is
A base that is erected around the first opening so as to surround the second valve body, and limits a movable range of the second valve body in the second direction;
A locking portion that is formed so as to protrude inward at the base portion and restricts a movable range of the second valve body in the second direction;
A flow rate switching device characterized by comprising: The flow rate switching device according to claim 5,
The second valve body is formed so as to be fitted inside the first opening, and the second main surface on the opposite side of the second valve body has the first main surface of the first valve body. A flow rate switching device characterized in that a second claw portion is formed to be engaged with the valve. The flow rate switching device according to any one of claims 1 to 6,
The first valve body is formed of a magnetic body,
The first electromagnet includes:
A first magnetic path is configured in cooperation with the first valve body, and a first facing surface facing the first valve body forms a part of the inner surface on the one side of the case body. A first magnetic path member disposed on the inner surface of the one side;
A first coil that generates a magnetic flux passing through the first magnetic path by energization;
A flow rate switching device comprising: The flow rate switching device according to claim 7,
The first magnetic path member is formed in an annular shape so as to surround the inflow hole, and has a first coil housing recess in the circumferential direction of the first opposing surface in the first opposing surface,
The flow rate switching device, wherein the first coil is housed in the first coil housing recess. The flow rate switching device according to any one of claims 1 to 7,
The second valve body is formed of a magnetic body,
The second electromagnet
A second magnetic path is formed in cooperation with the second valve body, and a second facing surface facing the second valve body forms a part of the inner surface on the one side of the case body. A second magnetic path member disposed on the inner surface of the one side;
A second coil that generates a magnetic flux passing through the second magnetic path by energization;
A flow rate switching device comprising: The flow rate switching device according to claim 9,
The second electromagnet is formed in an annular shape so as to surround the inflow hole, and has a second coil housing recess in the circumferential direction of the second opposing surface in the second opposing surface,
The flow rate switching device, wherein the second coil is housed in the second coil housing recess. The flow rate switching device according to any one of claims 1 to 10,
In the fully closed state of the flow rate switching device, both the first solenoid valve and the second solenoid valve are closed, and in the fully open state of the flow rate switching device, both the first solenoid valve and the second solenoid valve are open. The flow rate switching device, wherein the first solenoid valve is closed and the second solenoid valve is opened in the half-open state of the flow rate switching device. The flow rate switching device according to any one of claims 1 to 11,
When starting the outflow of the fluid from the outflow hole, the second solenoid valve is opened after a lapse of a certain time after the second solenoid valve is opened with the first solenoid valve closed. The flow rate switching device, wherein the first electromagnetic valve is opened in a valved state. A radiator for cooling the refrigerant flowing out of a predetermined internal combustion engine;
A first circulation circuit for circulating a refrigerant between the internal combustion engine and the radiator;
A pump for sending the refrigerant flowing through the first circulation circuit to the internal combustion engine;
The flow rate switching device according to claim 12, wherein the flow rate switching device is arranged on the refrigerant outflow side or the refrigerant inflow side of the internal combustion engine in the first circulation circuit without switching a branch point, and switches the flow rate of the refrigerant flowing through the first circulation circuit. ,
A control device for controlling opening and closing of the first solenoid valve and the second solenoid valve of the flow rate switching device;
A cooling system for an internal combustion engine, comprising: A cooling system for an internal combustion engine according to claim 13,
A heater core for heating using a refrigerant flowing out of the internal combustion engine;
A first branch point disposed before the refrigerant inflow side of the radiator in the first circulation circuit and a second branch point disposed after the refrigerant outflow side of the radiator in the first circulation circuit; A second circulation circuit connected via a heater core, circulating the refrigerant flowing out of the internal combustion engine to the heater core and returning it to the internal combustion engine;
A cooling system for an internal combustion engine, comprising: A radiator for cooling the refrigerant flowing out of a predetermined internal combustion engine;
A first circulation circuit for circulating a refrigerant between the internal combustion engine and the radiator;
A heater core for heating using a refrigerant flowing out of the internal combustion engine;
A first branch point disposed before the refrigerant inflow side of the radiator in the first circulation circuit and a second branch point disposed after the refrigerant outflow side of the radiator in the first circulation circuit; A second circulation circuit connected via a heater core, circulating the refrigerant flowing out of the internal combustion engine to the heater core and returning it to the internal combustion engine;
A pump for sending the refrigerant from the second branch point to the internal combustion engine;
13. The flow rate switching device according to claim 12, wherein the flow rate switching device is disposed on a refrigerant inflow side or a refrigerant outflow side of the heater core in the second circulation circuit without a branch point, and switches a flow rate of the refrigerant flowing in the second circulation circuit. ,
A control device for controlling opening and closing of the first solenoid valve and the second solenoid valve of the flow rate switching device;
A cooling system for an internal combustion engine, comprising:

Images