JP2016031139A - Fluid control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a fluid control valve expressing excellent sealability.SOLUTION: A fluid control valve includes a cylindrical rotor 20 in contact with an inner wall surface 10S of a housing 10 to be rotatable about a housing axis center X. An inlet port 13 from which a fluid flows into an internal space S and discharge ports 16a, 16b discharging the fluid are formed in the housing 10, and control openings 22a, 22b controlling the fluid are formed in the rotor 20. The rotor 20 is formed of a material deformable to increase a diameter, and includes an urging mechanism 30 closely attaching an outer wall surface 20S of the rotor 20 to the inner wall surface 10S of the housing 10.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a fluid control valve, and more particularly, to an improvement in a fluid control valve in which a cylindrical rotor is rotatably accommodated inside a housing.

  As a fluid control valve configured as described above, Patent Document 1 discloses that a fluid inlet opening in a direction along the axial center is formed in an end wall of a cylindrical main body (housing), and a cylindrical side wall of the cylindrical main body is formed. On the other hand, there is shown a technique in which at least two fluid outlets formed in a posture orthogonal to the axis are provided, and an adjustment member (rotor) that is rotatable around the axis is provided inside the cylindrical body. .

  In the fluid control valve of Patent Document 1, the adjustment member is configured to be driven and rotated by electric means, and the adjustment member has an end portion that forms an angle of about 45 degrees with respect to the axis. In addition, a part of the outer periphery of the adjustment member is made of a material having a low friction coefficient, and the adjustment member is provided with a ring-shaped seal ring that is partially open. Is configured to contact the cylindrical side wall.

Japanese Patent No. 4649211

  In a flow control valve having a structure in which a rotor is rotatably provided inside a cylindrical housing, it is necessary to suppress leakage of fluid from between the inner wall surface of the housing and the rotor in order to reliably control the fluid. Therefore, in Patent Document 1, a rotor is provided with a seal ring, and fluid pressure is applied to the seal ring so that the seal ring is brought into close contact with the inner wall surface of the housing, thereby suppressing fluid leakage.

  However, in a flow control valve that controls cooling water supplied by a water pump driven by an internal combustion engine such as an automobile, when the internal combustion engine is in an idling state and the water pressure decreases, the sealing performance of the seal ring decreases. Cooling water may leak and there is room for improvement. In particular, when the cooling water of the internal combustion engine leaks to the radiator during the warm-up operation of the internal combustion engine, the time until the temperature of the internal combustion engine rises becomes long, and improvement is required from the viewpoint of shortening the warm-up time.

  An object of the present invention is to constitute a fluid control valve that exhibits good sealing performance without depending on the pressure of the fluid.

A feature of the present invention is that an internal space having a cylindrical inner wall surface around a housing axis is formed, and an inflow port is formed to allow fluid to flow into the internal space in a direction along the housing axis. A housing in which a discharge port for discharging fluid from the internal space by a flow of fluid in a direction perpendicular to the axis is formed in the inner wall surface;
A fluid that is housed in the internal space of the housing and is made of a material that can be expanded and deformed so as to be in contact with the inner wall surface, and is discharged from the discharge port by rotating about the housing axis. A cylindrical rotor formed with a control opening for controlling the flow rate of
A rotation operating mechanism for rotating the rotor, and
The biasing mechanism has an outer wall surface of the rotor in close contact with the inner wall surface.

According to this configuration, even when the pressure of the fluid is low, the rotor is expanded in diameter by the urging force of the urging mechanism and contacts the inner wall surface of the housing. This enhances the adhesion between the inner wall surface of the housing and the outer wall surface of the rotor, and the flow of fluid between the inner wall surface of the housing and the outer wall surface of the rotor even if the discharge port of the housing is a relatively large opening. Can be suppressed.
Therefore, a fluid control valve that exhibits good sealing performance without depending on the pressure of the fluid has been constructed.

  In the present invention, the fluid is a heat medium that circulates between the internal combustion engine and the radiator by driving a fluid pressure pump, and the rotor closes the discharge port of the housing in a situation where the rotor closes the discharge port. When the pressure acts on the fluid and the negative pressure acts on the discharge port, the value of the urging force of the urging mechanism is set so that the inner wall surface of the housing and the outer wall surface of the rotor are maintained in close contact with each other. May be.

  According to this, even when a negative pressure acts on the discharge port due to the flow of the heat medium accompanying the start of the internal combustion engine, the contact state between the outer wall surface of the rotor and the inner wall surface of the housing is maintained by the biasing force of the biasing mechanism. Therefore, the heat medium inside the housing does not leak to the discharge port.

  In the present invention, the biasing mechanism is configured to increase the diameter of the end of the rotor at an outer end position from the discharge port on at least one end side in the direction along the housing axis of the rotor. An urging force may be applied.

In the configuration in which the rotor is accommodated in the internal space of the housing and fluid is allowed to flow into the internal space from the inlet on one end side of the housing, from the end of the rotor, between the outer wall surface of the rotor and the inner wall surface of the housing. Easy to get fluid. In particular, when fluid enters between the outer wall surface and the inner wall surface, the intruded fluid is discharged from the discharge port even when the rotor is in a posture of closing the discharge port.
On the other hand, the outer end position is expanded from the discharge port by the urging force of the urging mechanism, thereby improving the sealing performance and allowing fluid to flow between the rotor outer wall surface and the housing inner wall surface from the end of the rotor. The intrusion phenomenon is prevented and the inconvenience of the refrigerant leaking to the discharge port is also suppressed.

  In the present invention, the rotor has a slit that cuts the rotor in a direction along the axis of the housing, and the urging mechanism pushes the outer wall surface of the rotor toward the inner wall surface of the housing. An urging force may be applied.

  According to this, by forming a slit in the rotor, the diameter of the rotor can be easily increased, and the urging mechanism can flex the rotor by applying an urging force that presses the outer wall surface of the rotor against the inner wall surface of the housing. Thus, the outer wall surface can be securely brought into close contact with the inner wall surface of the housing.

  In the present invention, the rotor includes a slit that cuts the rotor in a direction along the housing axis, and the biasing mechanism applies a biasing force in a direction that increases a distance between the opening edges of the slit. Also good.

  According to this, by forming the slit in the rotor, the diameter of the rotor can be easily increased, and the urging force from the urging mechanism acts in the direction of increasing the distance between the opening edges of the slit. The urging force acts in the circumferential direction of the rotor and elastically deforms the entire rotor to bend. This elastic deformation increases the diameter in such a manner that the outer wall surface of the rotor is displaced in a direction in close contact with the inner wall surface of the housing, and as a result, the outer wall surface of the rotor is uniformly adhered to the inner wall surface of the housing. Is possible.

It is a block diagram which shows the circulating system of the cooling water of the engine of a vehicle. It is a perspective view of a fluid control valve. It is a disassembled perspective view of the rotor of a fluid control valve, and a rotation action mechanism. It is a partially cutaway perspective view of a rotor showing the arrangement of coil springs. It is an expanded view of a rotor. It is a longitudinal cross-sectional view of a fluid control valve. It is a cross-sectional view of a fluid control valve. It is a perspective view which shows another embodiment (a) torsion spring. It is a cross-sectional view which shows another embodiment (a) torsion spring. It is a perspective view of the modification of another embodiment (a). It is a cross-sectional view of a modification of another embodiment (a). It is a perspective view which shows another embodiment (b) rod-shaped spring. It is a cross-sectional view which shows another embodiment (b) lot-shaped spring. It is a longitudinal cross-sectional view of the fluid control valve of another embodiment (d). It is a cross-sectional view of the fluid control valve of another embodiment (e).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration]
As shown in FIGS. 2 to 7, the housing 10 is formed with an inner space S having a cylindrical inner wall surface 10 </ b> S around the housing axis X, and the housing axis X is centered with respect to the inner space S. A fluid control valve V is configured to include a rotor 20 that is rotatably accommodated and an electric motor M that drives and rotates the rotor 20 by a rotation operation mechanism T.

  The fluid control valve V is used to control the flow of cooling water (an example of fluid) that functions as a heat medium in an engine E (an example of an internal combustion engine) of a vehicle such as a passenger car. That is, as shown in FIG. 1, the fluid control valve V is disposed in a flow path through which the cooling water of the engine E circulates by the water pump 1 (an example of a fluid pressure pump), and the first supply flow from the fluid control valve V The cooling water circulation system is configured to send the cooling water to the radiator 2 via the path L1 and to send the cooling water to the heater core 3 via the second supply flow path L2. In this configuration, the water pump 1 driven by the engine E is assumed, but it may be driven by an electric motor.

  The fluid control valve V has a state in which the cooling water supply to the heater core 3 and the radiator 2 is blocked by setting the rotation angle of the rotor 20, a state in which the cooling water from the engine E is supplied only to the heater core 3, and the radiator 2. It functions as a three-way valve that can be set to be supplied to only the heater core and to the heater core 3 and the radiator 2 respectively.

[Specific configuration]
The housing 10 includes a main housing 11 in which an internal space S serving as a cylindrical inner wall surface 10S is formed, and a sub housing 12 connected to the main housing 11 from a direction along the housing axis X. The sub-housing 12 is formed with an inlet 13 through which cooling water flows into the internal space S by the flow of cooling water (an example of a fluid) in a direction along the housing axis X, and guides the cooling water to the inlet 13. An introduction tube 14 is provided on the outer surface.

  The main housing 11 has a first discharge port 16a and a second discharge port 16b that discharge cooling water (an example of fluid) from the internal space S by a fluid flow in a direction orthogonal to the housing axis X. Is formed. The main housing 11 discharges the cooling water from the first discharge port 16a to the first supply flow path L1 and discharges the cooling water from the second discharge port 16b to the second supply flow path L2. A second discharge pipe 17b is provided on the outer surface. In addition, the discharge port formed in the housing 10 may be one, and may be three or more.

  For example, the rotor 20 is formed by cylindrically molding a resin plate having a low friction coefficient such as polytetrafluoroethylene (PTFE) and excellent in slidability. The rotor 20 is configured to be able to be expanded in diameter by forming a slit 21, and is urged by a coil spring 30 in the direction of expanding the diameter as shown in FIGS. 4 and 7. Thereby, in the state accommodated in the internal space S of the housing 10 (specifically, the main housing 11), the outer wall surface 20S is in close contact with the inner wall surface 10S of the housing 10. Further, the rotor 20 has an axis common to the housing axis X.

  In the rotor 20, the radius of the outer wall surface 20 </ b> S is set to a value slightly larger than the radius of the inner wall surface 10 </ b> S of the housing 10 in a state where the urging force or the external force of the coil spring 30 is not applied. Thereby, in a state where the rotor 20 is accommodated in the internal space S of the housing 10, the outer wall surface 20 </ b> S of the rotor 20 is in close contact with the inner wall surface 10 </ b> S of the housing 10.

  The rotor 20 can be made of metal. In this case, the outer wall surface 20S may be coated with a resin having a low friction coefficient in order to improve the slidability with respect to the inner wall surface 10S of the housing 10.

  In the rotor 20, a slit 21 is formed so as to open in a direction along the housing axis X. A pair of bent pieces 21 a are formed by bending the material forming the rotor 20 inward at a position sandwiching the slit 21. The rotor 20 is formed with a first control opening 22a and a second control opening 22b corresponding to the first discharge port 16a and the second discharge port 16b.

  When the engine E is started, the fluid control valve V includes a first control opening 22a and a second control opening 22b in order to realize various combinations of cooling water supply to the radiator 2 and the heater core 3 and blocking of the supply. Is formed in a long hole shape.

  In the main housing 11, a control shaft 25 disposed on a coaxial core with the housing shaft core X is rotatably supported on the end surface on the opposite side of the inflow port 13 so as to penetrate the main housing 11 up and down. . An operation member 26 is fitted and supported at the inner end of the control shaft 25 and is fixed by a nut 27. The rotation operating mechanism T is configured to include the control shaft 25, the operation member 26, and the nut 27.

  An operation piece 26 a inserted into the slit 21 of the rotor 20 is integrally formed on the operation member 26 in a form extending in a direction along the housing axis X. Further, the driving rotational force of the electric motor M is transmitted to a portion of the control shaft 25 that protrudes outward from the main housing 11. The fluid control valve V includes a rotary encoder that detects the rotation angle of the control shaft 25, and a detection signal from the rotary encoder is fed back to the control device. Accordingly, the operation member 26 is rotated by driving the electric motor M, and the rotor 20 is rotated together with the operation piece 26a, whereby the rotational posture of the rotor 20 is determined.

[Configuration for leakage control]
In the fluid control valve V, the cooling water in the internal space S passes through the first control opening 22a and the second control opening 22b even when the fluid control valve V closes the first discharge port 16a and the second discharge port 16b. To the inner wall surface 10S of the housing 10. Therefore, when a slight gap is formed between the outer wall surface 20S of the rotor 20 and the inner wall surface 10S of the housing 10, there is an inconvenience that the cooling water leaks from the first discharge port 16a or the second discharge port 16b. Invite. The fluid control valve of the present invention has a configuration that suppresses leakage of cooling water.

  As shown in FIG. 4, as a close-contact urging configuration for suppressing this leakage, a spring receiving portion 21s is integrally formed at a position facing the pair of bent pieces 21a across the slit 21, and a spring holding recess formed in these portions. The compression coil spring 30 as an urging mechanism is fitted and held with respect to 21t. In particular, the pair of spring receiving portions 21s are provided at two locations near the both end portions in the direction along the housing axis X on the outer end side of the rotor 20 from the first control opening 22a and the second control opening 22b. Yes.

  With this close biasing configuration, a biasing force is applied in the direction of expanding the slit 21 near both ends of the rotor 20, and the rotor 20 is actively expanded in diameter by this biasing force, and the outer wall surface 20S of the rotor 20 is accommodated in the housing. The inner wall surface 10 </ b> S of 10 is closely contacted to suppress the leakage of the cooling water. In particular, in this configuration, the urging force of the coil spring 30 is applied in the direction in which the outer wall surface 20S of the rotor 20 is pressed against the inner wall surface 10S of the housing 10, and at the same time, is applied along the circumferential direction of the rotor 20. It is elastically deformed to bend the whole. As a result, the outer wall surface 20S of the rotor 20 is brought into close contact with the inner wall surface 10S of the housing 10.

  In addition, since the positions where the urging forces from the two coil springs 30 are located near both ends of the rotor 20, there is a problem that cooling water enters between the outer wall surface 20 </ b> S of the rotor 20 and the inner wall surface 10 </ b> S of the housing 10. In addition to suppressing the leakage, the leakage through the first control opening 22a and the second control opening 22b is favorably suppressed.

  In an automobile, the fluid control valve V is set in a state in which the supply of cooling water is blocked when the engine E is started. However, when the engine E is started, the rotational speed of the engine E temporarily increases, and the negative pressure acting via the first discharge port 16a or the second discharge port 16b also temporarily increases. When the negative pressure which acts in this way rises, it was also considered that the cooling water in the internal space S leaks out.

  Thus, in order to prevent leakage of cooling water even in a situation where negative pressure acts, the biasing force of the coil spring 30 is adjusted so that the outer wall surface 20S of the rotor 20 is brought into close contact with the inner wall surface 10S of the housing 10 with an appropriate pressure. Value is set. By setting the value of the urging force in this way, for example, the frictional force acting between the outer wall surface 20S of the rotor 20 and the inner wall surface 10S of the housing 10 is compared with that in which an excessive urging force is applied. The increase can be suppressed and the rotor 20 can be rotated easily.

  Further, as shown in FIG. 6, an inlet diameter Dt that is an inner diameter of the inlet 13 is set smaller than a rotor inner diameter Ds of the rotor 20 as a seal configuration that suppresses leakage. In this configuration, the inner surface of the inlet 13 overhangs (projects) on the inner periphery of the rotor 20, and the pressure of the cooling water does not act directly between the outer wall surface 20 </ b> S of the rotor 20 and the inner wall surface 10 </ b> S of the housing 10. It becomes a structure.

  In this seal configuration, when the cooling water flows into the internal space S through the inflow port 13, there is a phenomenon in which a part of the cooling water flows directly between the inner wall surface 10 </ b> S of the housing 10 and the outer wall surface 20 </ b> S of the rotor 20. This prevents the cooling water from leaking out.

[Effect of the embodiment]
As described above, in the fluid control valve V of the present embodiment, the rotor 20 is expanded in diameter by applying the urging force of the coil spring 30 to both ends of the rotor 20 in the direction along the housing axis X. The outer wall surface 20 </ b> S is in close contact with the inner wall surface 10 </ b> S of the housing 10. Thereby, even if the 1st control opening 22a and the 2nd control opening 22b are set to a closed state, the problem that a cooling water leaks out from the 1st discharge port 16a or the 2nd discharge port 16b is not caused.

  By actively expanding the diameters of both ends of the rotor 20, the outer wall surface 20 </ b> S of the rotor 20 is brought into close contact with the inner wall surface 10 </ b> S of the housing 10 at the corresponding portions, and the cooling water in the inner space S The inconvenience of entering in a form that wraps around the inner wall surface 10S of the housing 10 from both ends is also suppressed.

  Further, the inner surface of the inflow port 13 is overhanged on the inner diameter side of the rotor 20 to create a state in which the pressure of the cooling water does not act directly between the outer wall surface 20S of the rotor 20 and the inner wall surface 10S of the housing 10. Thereby, the problem that cooling water flows between the outer wall surface 20S of the rotor 20 and the inner wall surface 10S of the housing 10 is also suppressed.

  Further, by appropriately setting the urging force of the coil spring 30 that causes the outer wall surface 20S of the rotor 20 to be in close contact with the inner wall surface 10S of the housing 10, the cooling water can be supplied even if a negative pressure is applied when the engine E is started. There is no leakage from the first outlet 16a or the second outlet 16b. Moreover, since the urging force of the coil spring 30 does not act excessively, the electric motor M that drives and rotates the rotor 20 does not require a high output.

  In the fluid control valve V having this configuration, the pressure of the cooling water flowing into the internal space S acts on the inner wall surface of the rotor 20, so this pressure is applied to the outer wall surface 20 </ b> S of the rotor 20 and the inner wall surface 10 </ b> S of the housing 10. It is also possible to use it as an auxiliary to the urging force to be brought into close contact with.

[Another embodiment]
The present invention may be configured as follows in addition to the embodiment described above.

(A) As shown in FIGS. 8 and 9, by contacting the inner peripheral wall of the rotor 20, the rotor 20 is bent as a whole, and at the same time, the distances between the bent pieces 21 a constituting the opening edge of the slit 21. A ring-shaped torsion spring 31 (an example of an urging mechanism) that applies an urging force in a direction in which (the distance between the opening edges) is increased is provided. In this other embodiment (a), the torsion spring 31 has an outer diameter slightly larger than the inner diameter of the rotor 20 and is configured to be supported by a plurality of support members 21 c on the inner periphery of the rotor 20.

  As a result, the rotor 20 is elastically deformed and expanded in diameter in a form that is entirely deflected by the urging force of the torsion spring 31, and as a result, the outer wall surface 20S of the rotor 20 is averaged to the inner wall surface 10S of the housing 10. Adhere closely. This alternative embodiment (a) is an alternative to the close-contact urging configuration of the embodiment, and may be provided at only one location that is the central position in the direction of the housing axis X relative to the inside of the rotor 20. You may provide in two places which become both ends in the direction of the housing axis X, and may provide in three or more places.

  Moreover, the modification of another embodiment (a) is shown in FIG. 10, FIG. In this modification, an engagement piece 31 a is formed at the end of the torsion spring 31. In this modification, the pair of engaging pieces 31a are brought into contact with the bent pieces 21a of the rotor 20 to bend the rotor 20 as a whole, and at the same time, the distances between the bent pieces 21a of the slit 21 (opening edges). The urging force is actively applied in the direction of increasing the distance.

  This modification also has a configuration in which the torsion spring 31 is supported by the support member 21c on the inner periphery of the rotor 20 and each distance of the bent pieces 21a constituting the opening edge of the slit 21 (the distance between the opening edges). ) Is enlarged, and the same operational effects as in the other embodiment (a) are obtained. Even in this modification, the rotor 20 may be provided only at one location that is the central position in the direction of the housing axis X, or may be provided at two locations that are both ends in the direction of the housing axis X. Three or more locations may be provided.

(B) As shown in FIGS. 12 and 13, a rod-shaped spring 32 (an example of an urging mechanism) that applies an urging force in a direction in which each distance of the bent pieces 21 a constituting the opening edge of the slit 21 is increased. Prepare. In this alternative embodiment (b), a rod-shaped spring 32 is formed by bending a spring material into a “Z” shape. In addition, spring receiving portions 21s are integrally formed at opposite positions of the pair of bent pieces 21a in the direction along the housing axis X with the slit 21 therebetween.

  By engaging the pair of rod portions 32a of the rod-shaped spring 32 with the spring receiving portion 21s from this configuration, the urging force of the rod-shaped spring 32 is directed to the outer wall surface 20S of the rotor 20 toward the inner wall surface 10S of the housing 10. And act in the circumferential direction of the rotor 20 at the same time.

  This alternative embodiment (b) is an alternative to the close-contact urging configuration of the embodiment, and when the urging force acts, the rotor 20 is elastically deformed and expanded in an overall bending form, and as a result, The outer wall surface 20S of the rotor 20 is in close contact with the inner wall surface 10S of the housing 10 on average. The shape of the rod-shaped spring 32 is not limited to the “Z” shape, and may be a “U” shape, a “W” shape, or the like.

(C) By using a spring plate material for the material of the rotor 20 or by using a resin for the material and inserting a loop-shaped spring material inside, the radius of the outer wall surface 20S of the rotor 20 without any external force is applied. The value is set to be slightly larger than the radius of the inner wall surface 10S of the housing 10.

  In this other embodiment (c), the rotor 20 itself functions as an urging mechanism, and the outer wall surface 20S is averaged on the inner wall surface of the housing 10 by the rotor 20 being deformed in the diameter increasing direction by the urging force. It is possible to maintain contact with 10S with uniform pressure.

(D) As shown in FIG. 14, the inlet diameter Dt that is the inner diameter of the inlet 13 is set smaller than the rotor inner diameter Ds of the rotor 20, and at the same time, a first sleeve 13 s is formed on the inner periphery of the inlet 13. Is disposed at a position in close contact with the inner periphery of the rotor 20. Similarly, the second sleeve 11 s is formed on the inner surface of the main housing 11 on the side opposite to the inflow port 13, and the second sleeve 11 s is disposed at a position in close contact with the inner periphery of the rotor 20.

  This configuration replaces the configuration described as the seal configuration in the embodiment. In this alternative embodiment (d), the first sleeve 13s overlaps the end of the rotor 20 by the first overlap amount H1, and the second sleeve 11s overlaps the end of the rotor 20 by the second overlap amount H2. ing. Thereby, the pressure of the cooling water does not act directly between the outer wall surface 20S of the rotor 20 and the inner wall surface 10S of the housing 10, and a good sealing performance appears. This seal configuration may be provided only on one end side of the rotor 20.

(E) As shown in FIG. 15, the rotor 20 may be bent so that a part of the outer peripheral portion protrudes in the direction of the housing axis X to form the bent portion 23. This another embodiment (e) is an alternative to the close contact urging configuration of the embodiment, and the material of the rotor 20 on which the bent portion 23 is formed may be either resin or metal, and the friction coefficient on the outer wall surface 20S. A low resin may be coated. Further, the bent portion 23 may be formed thinner than the outer peripheral portion of the rotor 20.

  By configuring the rotor 20 in this way, it is possible not only to make flexible diameter-expansion deformation, but also to make the bent portion 23 function as an urging mechanism. In particular, in the configuration in which the bent portion 23 functions as an urging mechanism, the outer wall surface 20S can be satisfactorily brought into close contact with the inner wall surface 10S of the housing 10 without a special urging mechanism.

  The present invention can be used for a fluid control valve in which a cylindrical rotor is accommodated in an internal space of a housing.

1 Fluid pressure pump (water pump)
2 Radiator 10 Housing 10S Inner Wall 13 Inlet 16a Discharge Port (First Discharge Port)
16b outlet (second outlet)
20 rotor 20S outer wall surface 21 slit 22a control opening (first control opening)
22b Control opening (second control opening)
30 Biasing mechanism (coil spring)
31 Biasing mechanism (torsion spring)
32 Biasing mechanism (rod spring)
E Internal combustion engine
S Internal space T Rotation mechanism X Housing shaft core

Claims (5)

An internal space having a cylindrical inner wall surface centered on the housing axis is formed, an inflow port is formed to allow fluid to flow into the internal space in a direction along the housing axis, and a direction orthogonal to the housing axis A housing in which a discharge port for discharging the fluid from the internal space by the flow of fluid to the inner wall surface is formed;
A fluid that is housed in the internal space of the housing and is made of a material that can be expanded and deformed so as to be in contact with the inner wall surface, and is discharged from the discharge port by rotating about the housing axis. A cylindrical rotor formed with a control opening for controlling the flow rate of
A rotation operating mechanism for rotating the rotor, and
A fluid control valve having an urging mechanism for bringing the outer wall surface of the rotor into close contact with the inner wall surface.   The fluid is a heat medium that circulates between the internal combustion engine and the radiator by driving a fluid pressure pump, and the pressure is applied to the fluid as the internal combustion engine is started in a situation where the rotor closes the discharge port of the housing. The value of the urging force of the urging mechanism is set so as to maintain a close contact state between the inner wall surface of the housing and the outer wall surface of the rotor when a negative pressure acts on the discharge port. Item 2. The fluid control valve according to Item 1.   The biasing mechanism applies a biasing force in a direction of expanding the end of the rotor at an outer end position from the discharge port on at least one end side in the direction along the housing axis of the rotor. The fluid control valve according to claim 1 or 2, wherein:   The rotor has a slit that cuts the rotor in a direction along the housing axis, and the biasing mechanism applies a biasing force in a direction of pushing the outer wall surface of the rotor toward the inner wall surface of the housing. The fluid control valve according to any one of claims 1 to 3.   The said rotor has a slit which cuts the said rotor in the direction along the said housing axial center, and the said urging | biasing mechanism applies urging | biasing force in the direction which expands the distance of the opening edges of the said slit. The fluid control valve according to any one of the above.

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